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. A tip end 12a on the air outlet 21 side of the first cylinder part 12 is set at a position closer to the air inlet 11 than a blade tip end 37c at a center of a blade chord part 37b of the blade 37.SELECTED DRAWING: Figure 13

Description

Technical Field

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

Background Art

[0002] Conventionally, there is known a fan for clothing that is worn with a discharge port inserted into an opening formed in clothing and blows air (outside air) into the clothing (see, for example, Patent Document 1 and Patent Document 2). A conventional fan for clothing includes a hollow housing in which a fan body is disposed inside. The housing has a cylindrical first case in which a suction port is formed, and a cylindrical second case in which a discharge port facing the suction port is formed and into which the first case is inserted. Then, the fan for clothing is attached to the clothing by sandwiching the clothing between the first case and the second case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a fan for clothing, generally, the shorter the axial distance between the housing and the fan body, the higher the pressure inside the housing, and a pressure loss occurs when air is introduced from the suction port, resulting in a decrease in the amount of air discharged from the discharge port. Therefore, increasing the axial length of the housing and ensuring a large axial distance between the housing and the fan body can increase the air volume of the fan for clothing and enhance the blowing ability.

[0005] However, clothing fans are used attached to clothing. Therefore, the longer the axial length of the housing, the more it protrudes inward or outward from the clothing, increasing the chances of contact with the wearer's body and interfering with the wearer's work. For this reason, a shorter axial length is preferable for clothing fan housings.

[0006] This invention was made in view of the above-mentioned problems, and aims to provide a clothing fan that can improve airflow capacity while suppressing an increase in the axial dimension of the housing. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a clothing fan comprising: a hollow housing having an intake port and an outlet port facing the intake port; and a fan body disposed inside the housing, which is attached to clothing and blows air into the clothing, wherein the housing has a first case having a cylindrical first cylindrical portion with the intake port formed at one end, and a second case having a cylindrical second cylindrical portion with the outlet port formed at one end and into which the first cylindrical portion is inserted, and the fan body has a plurality of blades that are rotated by an electric motor held in the second case to blow air from the intake port to the outlet port, and when the direction in which the intake port and the outlet port face each other is the axial direction, the inner diameter of the second cylindrical portion is larger than the inner diameter of the first cylindrical portion over the entire length in the axial direction, and the tip of the first cylindrical portion on the outlet side is set to be closer to the intake port than the tip of the blade at the center of the chord portion of the blade. The first cylindrical portion has a first threaded portion formed on its outer circumferential surface, and the second cylindrical portion has a second threaded portion formed on its inner circumferential surface that connects to the first threaded portion. The first threaded portion is formed by a projection surrounding the outer circumferential surface of the first cylindrical portion, and the outer diameter on the suction port side is smaller than the outer diameter on the discharge port side. This was the structure. [Effects of the Invention]

[0008] As a result, the clothing fan of the present invention can improve airflow capacity while suppressing an increase in the axial dimension of the housing. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows a garment with the garment fan from Example 1 attached. [Figure 2] This is an exploded perspective view showing the clothing fan of Example 1. [Figure 3] This is a plan view of the clothing fan of Example 1, seen from the intake side. [Figure 4] This is a plan view of the clothing fan of Example 1, seen from the outlet side. [Figure 5] This is a side view of the clothing fan of Example 1. [Figure 6] This is a cross-sectional view AA in Figure 4. [Figure 7] This is a perspective view of the first case of Example 1, seen from inside the housing. [Figure 8] This is a perspective view of the second case of Example 1, seen from the outside of the housing. [Figure 9] This is a perspective view showing the blade member of Example 1. [Figure 10] This is a plan view of the blade member of Example 1 as seen from the intake side. [Figure 11] This is a side view of the blade member of Example 1. [Figure 12] This graph shows the relationship between the distance from the downstream end of the wing chord to the opening edge of the discharge port and the simulated airflow. [Figure 13] Figure 3 is a cross-sectional view of BB. [Figure 14] This table shows the pressure distribution around the blade. [Figure 15A] This is a cross-sectional view showing the main components of the first prototype clothing fan. [Figure 15B] This is a cross-sectional view showing the main components of the second prototype clothing fan. [Figure 15C] This is a cross-sectional view showing the main components of the third prototype clothing fan. [Figure 16] This graph shows the relationship between the distance from the blade tip at the center of the chord to the tip of the first cylinder and the simulated airflow. [Figure 17] This graph shows the measured airflow for the clothing fan in Example 1 and the clothing fan in the first comparative example. [Figure 18]It is a graph showing the actually measured air volume of the clothes fan of Example 1 and the clothes fan of Comparative Example 2. [Figure 19] It is a cross-sectional view showing the clothes fan of Example 2. [Figure 20] It is a side view showing the first case of Example 2. [Figure 21] It is a cross-sectional view taken along the line C-C in FIG. 20. [Figure 22] It is a cross-sectional view omitting the blade member showing the second case of Example 2. [Figure 23] It is a plan view of the second case of Example 2 as seen from the suction port side.

Mode for Carrying Out the Invention

[0010] A mode for carrying out the clothes fan of the present invention will be described based on Example 1 and Example 2 shown in the drawings.

[0011] (Example 1) The clothes fan 1 of Example 1 is detachably attached to a piece of clothing 100 such as a top (jumper) that a wearer wears on the upper body. And the clothes fan 1 sends air (outside air) into the inside of the clothes 100 to cool the wearer's body.

[0012] Here, as shown in FIG. 1, for example, a pair of openings 102 are formed in the back body 101 that covers the wearer's back in the piece of clothing 100. The openings 102 are circular through-holes that penetrate the back body 101. On the other hand, as will be described later, the clothes fan 1 of Example 1 has a first case 10 that is inserted into the opening 102 from the outside of the clothes 100, and a second case 20 that is disposed inside the clothes 100. And the clothes fan 1 is attached to the clothes 100 by sandwiching the peripheral region of the opening of the back body / top 101 between the first case 10 and the second case 20.

[0013] The clothes fan 1 of Example 1 includes a housing 2 and a fan body 3, as shown in FIGS. 2 to 6.

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

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

[0016] The first cylindrical portion 12 is a cylindrical member with both ends open. The suction port 11 is formed by the opening at one end of the first cylindrical portion 12. The first cylindrical portion 12 is screwed into the second cylindrical portion 22 of the second case 20, which will be described later, from the tip 12a of the other end. A first threaded portion 15 is formed on the outer circumferential surface of the first cylindrical portion 12.

[0017] The axial length L1 (see Figure 6) of the first cylindrical portion 12 is set to 10 mm in this case. Note that length L1 is the axial length of the outer surface of the first cylindrical portion 12 and does not include the thickness of the retaining portion 14. In other words, 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 it is necessary to have a length that allows for the formation of the first threaded portion 15 that can fix the first cylindrical portion 12 to the second cylindrical portion 22. For this reason, it is preferable that length L1 be set to 10 mm or more.

[0018] The suction port guard 13 prevents foreign objects such as fingers from entering the housing 2 through the suction port 11. As shown in Figures 3 and 7, the suction port guard 13 has a central support portion 13a, a plurality of suction side cross members 13b, and a plurality of connecting cross members 13c. The suction port guard 13 is also provided perpendicular to the axial direction X and is formed flat with respect to the suction port 11 (see Figure 6).

[0019] The central support portion 13a is a disc-shaped member positioned in the center of the intake port 11. When viewed along the axial direction X, the central support portion 13a is set to be approximately the same size as the electric motor 34 of the fan body 3, which will be described later.

[0020] Multiple suction-side support 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 Embodiment 1 has three suction-side support members 13b. Each suction-side support member 13b is arranged concentrically around the center of the suction port 11.

[0021] The multiple connecting members 13c are rod-shaped members that connect the central support portion 13a and the multiple suction-side connecting members 13b to the first cylindrical portion 12. Each connecting member 13c is spanned between the opening edge 11a of the suction port 11 and the suction-side connecting members 13b, between the suction-side connecting members 13b themselves, or between the suction-side connecting members 13b and the central support portion 13a. Furthermore, when viewed along the axial direction X, the multiple connecting members 13c are formed at regular intervals along the circumferential direction centered on the center of the suction port 11. In addition, each connecting member 13c is arranged discontinuously in the radial direction from the center of the suction port 11 (see Figure 3).

[0022] The retaining 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 retaining portion 14 is formed around the entire circumference of the first cylindrical portion 12. The width of the retaining portion 14 (the length of protrusion from the outer surface of the first cylindrical portion 12) and the thickness of the retaining portion 14 can be set arbitrarily. Furthermore, the external shape of the retaining portion 14, when viewed along the axial direction X, is approximately a regular hexagon.

[0023] The second case 20, as shown in Figures 2 and 8, has a cylindrical second cylindrical portion 22, a discharge port guard portion 23 that covers the discharge port 21, and a finger rest portion 24.

[0024] The second cylindrical portion 22 is a cylindrical member with both ends open. 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 threaded portion 25 is formed on the inner circumferential surface of the second cylindrical portion 22. The second threaded portion 25 connects to the first threaded portion 15 when the first cylindrical portion 12 is screwed into the second cylindrical portion 22. The second threaded portion 25 is divided into multiple sections in the circumferential direction of the second cylindrical portion 22, as shown in Figure 2.

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

[0026] The axial length L2 (see Figure 6) of the second cylindrical portion 22 is set to 22 mm in this case. Note that length L2 is the axial length from the tip 22a of the second cylindrical portion 22 that contacts the clothing 100 to the opening edge 21a of the discharge port 21. Length L2 is set considering the axial length X of the blade member 32 and the axial position of the blade member 32.

[0027] Furthermore, while the diameter of the garment fan 1 in Example 1 can be defined by the outer diameter of the second case 20, it can be arbitrarily set according to the type of garment 100 and the required airflow.

[0028] The discharge port guard section 23 prevents foreign objects such as fingers from entering the housing 2 through the discharge port 21. As shown in Figures 4 and 8, the discharge port guard section 23 includes a motor housing section 23a, a plurality of discharge side rail members 23b, a plurality of connecting rail members 23c, and a connector housing section 23d. Furthermore, the discharge port guard section 23 is formed to the outside of the discharge port 21 in the axial direction X (see Figures 5 and 6). In other words, when viewed from the side, the discharge port guard section 23 bulges outward in the axial direction X from the opening edge 21a of the discharge port 21.

[0029] Here, the protrusion length L2' (see Figure 6) of the discharge port guard portion 23 from the opening edge 21a of the discharge port 21 can be set arbitrarily, and in Embodiment 1 it is set to 7.9 mm. If L2' is short, the axial length X of the housing 2 can be shortened, making it possible to make the clothing fan 1 thinner. However, the distance between the housing 2 and the blade member 32 becomes shorter, which may cause pressure loss and a decrease in airflow. On the other hand, if L2' is long, the gap between the housing 2 and the blade member 32 can be increased, which can suppress pressure loss and prevent a decrease in airflow. However, the increased axial length X of the housing 2 may cause discomfort when worn (for example, the clothing fan 1 may touch the wearer's body).

[0030] The motor housing 23a is a cylindrical recess sized to accommodate the electric motor 34 (described later), and is formed in the center of the discharge port 21. The motor housing 23a is recessed inward towards the housing 2, has a flat closed surface 23e facing the suction port 11, and is open to the outside of the housing 2. A through hole 23f is formed at the center of the closed surface 23e.

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

[0032] Furthermore, as shown in Figures 4 and 5, each discharge side member 23b extends from the peripheral edge of the motor housing 23a in a direction perpendicular to the axial direction X, and has a bent portion 23g at an intermediate position 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 member 23b extends almost along the axial direction X.

[0033] The multiple connecting members 23c are rod-shaped members that span between the discharge-side connecting members 23b. Each connecting member 23c is formed to be continuous along the circumferential direction centered on the center of the discharge port 21 when viewed along the axial direction X. Furthermore, each connecting member 23c is positioned at a constant distance radially from the center of the discharge port 21 between the bent portion 23g and the motor housing portion 23a.

[0034] The connector housing section 23d is a recess sized to accommodate the power supply connector 33, which will be described later, and is formed adjacent to the motor housing section 23a. Here, the connector housing section 23d is in communication with the motor housing section 23a and is formed so that a harness 35 for electrically connecting the electric motor 43 and the power supply connector 33 can be routed through it. Also, as shown in Figure 4, when viewed along the axial direction X, the connector housing section 23d is located in the area inside the second cylindrical section 22 (the area overlapping with the discharge port 21).

[0035] The finger rest portion 24 is an annular member formed on the outer circumferential surface of the second cylindrical portion 22. The finger rest portion 24 in Embodiment 1 is composed of a flange-shaped plate portion 24a and a ring portion 24b (see Figure 6). The plate portion 24a protrudes outward from the housing 2 from an intermediate position in the axial direction X of the second cylindrical portion 22 and is provided around the entire circumference of the second cylindrical portion 22. The ring portion 24b extends from the tip of the plate portion 24a to the other end of the second cylindrical portion 22 (the opening into which the first cylindrical portion 12 is screwed). Multiple recesses 24c are formed on the outer circumferential surface of the ring portion 24b, which are arc-shaped indentations toward the radially inward direction (see Figure 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 by placing their fingers on them when attaching the clothing fan 1.

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

[0037] The motor mechanism 31 consists of a power connector 33 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 power connector 33 and the electric motor 34.

[0038] The power supply connector 33 is housed in the connector housing section 23d of the discharge port guard section 23. The electric motor 34 is housed in the motor housing section 23a of the discharge port guard section 23. Here, the electric motor 34 is a DC brushless motor. A DC brushless motor is a DC motor that uses a DC power supply to rotate a rotating shaft 34a, and does not have brushes that rotate the rotating shaft 34a in a constant direction in combination with a commutator. In other words, the electric motor 34 of Embodiment 1 controls the rotation of the rotating shaft 34a using an electronic circuit without using a commutator and brushes. The rotating shaft 34a of the electric motor 34 protrudes from a through hole 23f formed in the motor housing section 23a. Furthermore, the harness 35 is routed between the motor housing section 23a and the connector housing section 23d and is housed inside the discharge port guard section 23.

[0039] Furthermore, a motor cap 26 is fitted to the second case 20 of Embodiment 1, which integrally covers the motor housing 23a and the connector housing 23d. With the motor cap 26 fitted 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 Figures 9 to 11, the wing member 32 consists of a cylindrical hub 36 and a plurality of (in this case, five) wing blades 37 fixed to the circumferential surface of the hub 36.

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

[0042] Multiple (five in this case) blades 37 are attached to the outer surface of the shaft body 36a at regular intervals, as shown in Figure 9. Here, each blade 37 has both its radially inward root portion 37a and radially outward chord portion 37b attached inclined with respect to the axial direction X. Furthermore, the projected area, chord length Lα, and pitch angle θ of each blade 37 when viewed from the axial direction X are the same. The "projected area" refers to the area of ​​the projected region of the blade 37 when viewed from the axial direction X. The "chord length Lα" refers to the length of the chord portion 37b along the rotational direction (see Figure 10). The "pitch angle θ" is the angle between the rotational plane (the plane perpendicular to the axial direction X) of each blade 37 and the chord. The "chord" is the straight line connecting the upstream end and downstream end of the blade 37 (for example, the upstream root end 38a and the downstream root end 38b). The pitch angle θ is set to gradually decrease from the root portion 37a of the blade 37 towards the chord portion 37b.

[0043] Furthermore, the root portion 37a of each blade 37 is attached near the shaft end face 36b at the upstream end 38a on the root side, which is the uppermost part in the direction of rotation, and near the opening of the shaft body portion 36a at the downstream end 38b on the root side, which is the lowermost part in the direction of rotation. When viewed from the side, as shown in Figures 6 and 11, at least a portion of each blade 37 (the upstream edge portion 39a of the blade 37) protrudes towards the intake port 11 side beyond the shaft end face 36b. In other words, the shaft end face 36b of the hub 36 is recessed towards the electric motor 34 side beyond the upstream edge portion 39a of the blade 37.

[0044] Furthermore, the "upstream edge 39a of the feather 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 uppermost part of the chord portion 37b in the direction of rotation.

[0045] Furthermore, in the garment fan 1 of Example 1, the diameter R1 of the shaft body 36a is set to 33.0 mm, and the diameter R2 of the blade member 32 is set to 84.0 mm, with the ratio of diameter R1 to diameter R2 being set to 39.2%. Here, a larger diameter R2 is advantageous for increasing the airflow discharged from the garment fan 1. However, increasing the diameter R2 brings the blade member 32 closer to the housing 2, increasing pressure loss and reducing airflow. In order to suppress the increase in pressure loss, it is necessary to ensure a larger distance between the blade member 32 and the housing 2, which requires increasing the inner diameter of the housing 2. However, in that case, the garment fan 1 becomes larger and may get in the way of the wearer, or it may not be possible to attach it to clothing 100 that has an existing opening 102.

[0046] Therefore, in order to suppress the increase in the inner diameter of the housing 2 and suppress the decrease in airflow, it is desirable that the ratio of the diameter R1 of the shaft body 36a to the diameter R2 of the blade member 32 be less than 40%. In other words, it is desirable that the relationship between the length of the diameter R1 of the shaft body 36a and the diameter R2 of the blade member 32 satisfies the following equation (1). R1 / R2 × ​​100 < 40 (%) ... (1)

[0047] In the case of the clothing 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 made 84.0 mm or more, it is possible to make the diameter R1 of the shaft body 36a 33.6 mm or more.

[0048] Note that "Diameter R1 of the shaft barrel 36a" is the outer diameter dimension of the shaft barrel 36a when the blade member 32 is viewed along the axial direction X, as shown in Figure 10. Also, "Diameter R2 of the blade member 32" is the diameter dimension of the trajectory 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 Figure 10.

[0049] Furthermore, in the clothing 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%. In other words, length L3 is set to 51.1% of length L4. 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 leading to 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, making the housing 2 larger. Also, 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 airflow will not be discharged. Therefore, it is desirable that the ratio of the axial length L3 of the blades 37 to the axial length L4 of the housing 2 be set to 45% to 60% (45% or more and 60% or less).

[0050] In the case of the clothing fan 1 of Example 1, since the axial length L4 of the housing 2 is set to 35 mm, it is desirable that the axial length L3 of the blades 37 be set to 15.75 mm to 21.0 mm. However, the axial length L4 of the housing 2 is not limited to 35 mm, and the preferred range of the axial length L3 of the blades 37 varies depending on the axial length L4 of the housing 2.

[0051] Note that the "axial length L3 of the blades 37" is the length along the axial direction X of each blade 37, as shown in Figure 11. Also, the "axial length L4 of the housing 2" is the maximum length from the outer surface of the suction port guard portion 13 to the outer surface of the discharge port guard portion 23, as shown in Figure 6. Length L4 does not include the portion of the motor cap 26 that protrudes from the discharge port guard portion 23.

[0052] Furthermore, in the clothing fan 1 of Embodiment 1, the blade member 32 is supported by the second case 20, but depending on the axial position X of the opening edge 21a of the discharge port 21, the downstream edge 39b of the blade 37 moves away from the discharge port 21 or closer to the discharge port 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 downstreammost part of the chord portion 37b in the direction of rotation.

[0053] Furthermore, as shown in Figure 12, the airflow discharged from the clothing fan 1 reaches its maximum value when viewed from the side, with the axial distance X from the chord-side downstream end 38d of the blade 37 to the opening edge 21a of the discharge port 21 being zero mm, that is, when the axial position X of the opening edge 21a of the discharge port 21 coincides with the axial position X of the chord-side downstream end 38d. Also, the airflow discharged from the clothing fan 1 decreases as the axial position X of the opening edge 21a of the discharge port 21 shifts along the axial direction X relative to the chord-side downstream end 38d (as the absolute value of the axial distance X from the chord-side downstream end 38d to the opening edge 21a of the discharge port 21 increases).

[0054] Moreover, the amount of air discharged from the clothing fan 1 is lower than the maximum value regardless of whether the axial position X of the opening edge 21a of the discharge port 21 is shifted towards the intake port 11 side or towards the discharge port 21 side, relative to the chord-side downstream end 38d.

[0055] Thus, in the clothing fan 1, the airflow is at its maximum when the axial X position of the opening edge 21a of the discharge port 21 coincides with the axial X position of the chord-side downstream end 38d when viewed from the side, and the airflow decreases as the axial X position of the opening edge 21a of the discharge port 21 deviates from the axial X position of the chord-side downstream end 38d.

[0056] Therefore, in the garment fan 1 of Embodiment 1, the axial position X of the opening edge 21a of the discharge port 21 is set within a predetermined range A (see Figure 6) along the axial direction X with reference to the chord-side downstream end 38d. In the garment fan 1 of Embodiment 1, the "predetermined range A" is defined based on the rate of decrease from the maximum value of the airflow discharged from the housing 2.

[0057] In other words, in the clothing fan 1 of Example 1, the axial distance Lx (see Figure 6) from the chord-side downstream end 38d of the blade 37 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 value of the discharged airflow.

[0058] Specifically, in the garment fan 1 of Example 1, the above reduction rate is set to approximately 3% (a reduction rate such that the reduction from the maximum airflow is about 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 intake port 11, and 2 mm from the chord-side downstream end 38d toward the discharge port 21. In other words, in the garment fan 1 of Example 1, the axial position X of the opening edge 21a of the discharge port 21 is set to fall within the range A defined to 2 mm toward the intake port 11 and the discharge port 21, respectively, with the chord-side downstream end 38d as the reference (zero mm). Therefore, in the garment fan 1 of Example 1, the axial distance X Lx from the chord-side downstream end 38d of the blade 37 to the opening edge 21a of the discharge port 21 is a maximum of 2 mm.

[0059] The "percentage decrease from the maximum value of the airflow discharged from the clothing fan 1" set when defining the "predetermined range A" can be set arbitrarily, but a smaller value is preferable. Also, the size of the predetermined range A becomes narrower as the "percentage decrease from the maximum value of the airflow discharged from the clothing fan 1" decreases.

[0060] Therefore, it is preferable that the "predetermined range A" is defined as a range of 2 mm or less from the chord-side downstream end 38d along the axial X toward the intake port 11, and 2 mm or less from the chord-side downstream end 38d along the axial X toward the discharge port 21, according to the arbitrarily set "rate of decrease from the maximum value of the airflow discharged from the clothing fan 1". For example, the "predetermined range A" may be set to 1.2 mm toward the intake port 11 and discharge port 21, respectively, with the chord-side downstream end 38d as the reference (zero mm).

[0061] Furthermore, in the garment fan 1 of Example 1, the "percentage decrease from the maximum value of the airflow discharged from the garment fan 1" may be set to zero percent, and the "predetermined range A" may be defined as zero mm on the intake port 11 side and zero mm on the discharge port 21 side, with the axial X position of the chord-side downstream end 38d as the reference (zero mm). In this case, the axial X position of the opening edge 21a of the discharge port 21 coincides with the axial X position of the chord-side downstream end 38d.

[0062] Furthermore, in the clothing fan 1 of Embodiment 1, as shown in Figure 13, when viewed in a cross-section along the axial direction X passing through the circumferential center position of the chord portion 37b of the blade 37 and the rotation center of the blade member 32 (rotation axis 34a of the electric motor 34) (BB cross-section in Figure 3), the tip 12a of the first cylindrical portion 12 on the discharge port 21 side is set to be closer to the intake port 11 than the tip 37c of the blade at the circumferential center position of the chord portion 37b of the blade 37.

[0063] Here, "the circumferential center position of the chord portion 37b of the feather 37" refers to the position β that divides the chord length Lα in half along the circumferential direction, as shown in Figure 10. Also, "the feather tip 37c at the circumferential center position of the chord portion 37b" refers to the portion of the chord portion 37b at position β. Hereafter, "the circumferential center position of the chord portion 37b" will simply be referred to as "the center of the chord portion 37b" or "the central position of the chord portion 37b".

[0064] In Example 1, when the clothing fan 1 is not attached to the clothing 100, that is, when the tip 22a of the second cylindrical portion 22 is in contact with the retaining portion 14 (see Figure 13), the tip 12a of the first cylindrical portion 12 on the discharge port 21 side is set to be 3 mm closer to the intake port 11 than the blade tip 37c. In other words, in the clothing fan 1 of Example 1, when it is not attached to the clothing 100, the distance Lβ along the axial X from the blade tip 37c at the center of the chord portion 37b to the tip 12a of the first cylindrical portion 12 is set to -3 mm.

[0065] Furthermore, in the garment fan 1 of Example 1, if the absolute value of the distance Lβ along the axial X from the blade tip 37c at the center of the chord portion 37b to the tip 12a of the first cylindrical portion 12 is too large, it may not be possible to form the first screw portion 15, for example. Therefore, it is desirable that the absolute value of the above distance Lβ be 3 mm or less when the garment fan 1 is not attached to the garment 100.

[0066] Furthermore, when the garment fan 1 is attached to the garment 100, the back panel 101 of the garment 100 is sandwiched between the tip 22a of the second cylindrical portion 22 and the pressing portion 14 (see Figure 5). Therefore, when the garment fan 1 is attached to the garment 100, the tip 12a of the first cylindrical portion 12 is further away from the blade tip 37c than when the garment fan 1 is not attached to the garment 100. As a result, even when the garment fan 1 is attached to the garment 100, the state in which the tip 12a of the first cylindrical portion 12 is set to be closer to the intake port 11 than the blade tip 37c is maintained.

[0067] The operation of the clothing fan 1 in Example 1 will be explained below.

[0068] In the clothing fan 1, when the fan body 3 is driven, air flows into the housing 2 from the intake port 11 and is discharged from the outlet port 21. In other words, the driving force of the fan body 3 causes air to flow from the intake port 11 to the outlet port 21.

[0069] On the other hand, the pressure distribution around the blade 37 varies depending on the axial positional relationship between the blade tip 37c at the center of the chord portion 37b of the blade 37 and the tip 12a of the first cylindrical portion 12, as shown in Figure 14.

[0070] In Figure 14, the "suction side pressure value" is the simulated pressure value at a predetermined position between the suction port 11 and the tip 12a of the first cylindrical section 12. The "discharge side pressure value" in Figure 14 is the simulated pressure value around the opening edge 21a of the discharge port 21. The "pressure difference" in Figure 14 is the difference between the suction side pressure value and the discharge side pressure value (the absolute value of the difference between the suction side pressure value and the discharge side pressure value). A negative pressure value indicates negative pressure, and a larger value indicates lower pressure.

[0071] Furthermore, the "first prototype" in Figure 14 is a clothing fan in which the axial position X of the tip 12a of the first cylindrical section 12 is set to be 3 mm closer to the intake port 11 than the blade tip 37c at the center of the chord section 37b, as shown in Figure 15A. In other words, in the first prototype clothing fan, the distance Lβ along the axial X from the blade tip 37c to the tip 12a of the first cylindrical section 12 is set to -3 mm.

[0072] Furthermore, the "second prototype" in Figure 14 is a clothing fan in which the position of the tip 12a of the first cylindrical section 12 and the position of the blade tip 37c at the center of the chord section 37b are almost coincided in the axial direction X, as shown in Figure 15B. In other words, in the second prototype clothing fan, the distance Lβ along the axial direction X from the blade tip 37c to the tip 12a of the first cylindrical section 12 is set to zero mm.

[0073] Furthermore, the "third prototype" in Figure 14 is a clothing fan in which the axial position X of the tip 12a of the first cylindrical section 12 is set to be 3 mm closer to the discharge port 21 than the blade tip 37c at the center of the chord section 37b, as shown in Figure 15C. In other words, in the third prototype clothing fan, the distance Lβ along the axial X from the blade tip 37c to the tip 12a of the first cylindrical section 12 is set to +3 mm.

[0074] Furthermore, the first, second, and third prototype clothing fans have the same configuration as each other, except for the relationship between the axial position of the tip 12a of the first cylindrical section 12 and the axial position of the blade tip 37c at the center of the chord section 37b.

[0075] Generally, air tends to flow from areas of high pressure to areas of low pressure. Therefore, as can be seen from the pressure distribution around the blades shown in Figure 14, a pressure difference is created inside the housing 2, and air tends to flow from the discharge port 21 towards the intake port 11. However, this airflow due to the pressure difference becomes a resistance to the airflow from the intake port 11 to the discharge port 21 caused by the driving force of the fan body 3. Moreover, this resistance increases as the pressure difference between the intake side pressure value and the discharge side pressure value increases, and as a result, smooth airflow is hindered.

[0076] In contrast, the results shown in Figure 14 reveal that the closer the axial position X of the tip 12a of the first cylindrical section 12 is to the intake port 11 than the axial position X of the blade tip 37c at the center of the chord section 37b, the smaller the pressure difference between the intake pressure and the discharge pressure can be. In other words, it was found that the closer the tip 12a of the first cylindrical section 12 is to the intake port 11 than the blade tip 37c at the center of the chord section 37b, the more effective it is at suppressing resistance to the airflow from the intake port 11 to the discharge port 21.

[0077] As shown in Figure 16, the first prototype clothing fan simulated an airflow of approximately 100 [L / s]. The second prototype clothing fan simulated an airflow of approximately 99 [L / s]. The third prototype clothing fan simulated an airflow of approximately 97 [L / s].

[0078] In other words, as shown in Figure 16, the airflow is at its maximum value when the axial position X of the tip 12a of the first cylindrical section 12 is closer to the intake port 11 than the axial position X of the blade tip 37c at the center of the chord section 37b (first prototype). On the other hand, when the axial distance X Lβ between the tip 12a of the first cylindrical section 12 and the blade tip 37c at the center of the chord section 37b is zero mm (the axial position of the tip 12a of the first cylindrical section 12 and the blade tip 37c at the center of the chord section 37b coincide) (second prototype), the airflow decreases below the maximum value. Furthermore, the airflow decreases as the tip 12a of the first cylindrical section 12 moves away from the intake port 11 along the axial direction X (third prototype).

[0079] Thus, from the pressure distribution around the blades shown in Figure 14 and the simulated airflow results shown in Figure 16, it became clear that by positioning the axial X of the tip 12a of the first cylindrical section 12 closer to the intake port 11 than the blade tip 37c at the center of the chord section 37b, the pressure difference between the intake side pressure value and the discharge side pressure value can be reduced without increasing the axial dimension of the housing 2, thereby suppressing a decrease in the airflow of the clothing fan 1.

[0080] In contrast, in the clothing fan 1 of Embodiment 1, as shown in Figure 13, when viewed in a cross-section along the axial direction X passing through the center of the chord portion 37b of the blade 37, the tip 12a of the first cylindrical portion 12 is set to be closer to the intake port 11 than the blade tip 37c at the center of the chord portion 37b of the blade 37. Therefore, as is clear from Figures 14 and 16, the clothing fan 1 of Embodiment 1 can improve the airflow capacity while suppressing an increase in the axial dimension of the housing 2.

[0081] Figure 17 shows the measured airflow values ​​for the clothing fan 1 of Example 1 and the measured airflow values ​​for the clothing fan of the first comparative example. Here, the clothing fan of the first comparative example has a configuration in which the position of the tip 12a of the first cylindrical portion 12 and the position of the blade tip 37c at the center of the chord portion 37b are almost coincided in the axial direction X, similar to the second prototype clothing fan shown in Figure 15B. Furthermore, the clothing fan of the first comparative example has the same configuration as the clothing fan 1 of Example 1, except for the configuration in which the tip 12a of the first cylindrical portion 12 and the blade tip 37c are almost coincided in the axial direction X.

[0082] As shown in Figure 17, in the garment fan 1 of Example 1, although the axial distance X between the housing 2 and the fan body 3 is set to the same size as the garment fan of the first comparative example, it was found that the amount of air discharged can be increased and the air supply capacity can be improved compared to the garment fan of the first comparative example.

[0083] Furthermore, in the garment fan 1 of Embodiment 1, a first threaded portion 15 is formed on the outer circumferential surface of the first cylindrical portion 12, and a second threaded portion 25 that connects to the first threaded portion 15 is formed on the inner circumferential surface of the second cylindrical portion 22. The axial length X L1 of the first cylindrical portion 12 is set to 10 mm or more.

[0084] As a result, the garment fan 1 of Embodiment 1 can secure the necessary length of the first screw portion 15 for screwing the first case 10 to the second case 20. Furthermore, in the garment fan 1 of Embodiment 1, since the first case 10 is screwed to the second case 20, the first case 10 and the second case 20 can be attached and detached more easily compared to fixing by claw fitting, etc.

[0085] Furthermore, in the clothing fan 1 of Embodiment 1, a hub 36 is attached to the electric motor 34, which has a cylindrical shaft body 36a surrounding the electric motor 34 and a shaft end face 36b that closes one end of the shaft body 36a and faces the intake port 11. Multiple blades 37 are provided on the outer circumferential surface of the shaft body 36a at regular intervals, and at least a portion of them protrudes toward the intake port 11 side beyond the shaft end face 36b.

[0086] As a result, the clothing fan 1 of Example 1 can increase the amount of air discharged and enhance its airflow capacity compared to the clothing fan of the second comparative example, as shown in Figure 18.

[0087] Furthermore, the clothing fan of the second comparative example has a configuration in which the shaft end face 36b of the hub 36 protrudes toward the intake port 11 side than the plurality of blades 37 which are provided at regular intervals on the outer surface of the shaft body 36a. In addition, the clothing fan of the second comparative example has the same configuration as the clothing fan 1 of Example 1, except for the configuration in which the shaft end face 36b protrudes toward the intake port 11 side than the blades 37.

[0088] Furthermore, in the clothing fan 1 of Embodiment 1, a hub 36 is attached to the electric motor 34, which has a cylindrical shaft body 36a surrounding the electric motor 34 and a shaft end face 36b that closes one end of the shaft body 36a and faces the intake port 11. In addition, a plurality of blades 37 are provided on the outer surface of the shaft body 36a at regular intervals. 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 less than 40%.

[0089] In this case, increasing the diameter R2 shortens the distance between the blade member 32 and the housing 2, increasing pressure loss and reducing airflow. Also, if the inner diameter of the housing 2 is increased to ensure a larger distance between the blade member 32 and the housing 2, the clothing fan 1 becomes larger. By setting the ratio of the diameter R1 of the shaft body 36a to the diameter R2 of the blade member 32 to less than 40%, the clothing fan 1 of Embodiment 1 can suppress the increase in the inner diameter of the housing 2 and suppress the decrease in airflow.

[0090] Furthermore, in the clothing fan 1 of Example 1, the ratio of the axial length X of the blade 37 to the axial length X of the housing 2 L4 is set to 45% or more and 60% or less. If the ratio of length L3 to length L4 is greater than 60%, the pressure loss increases, leading to 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 larger, or the blade angle and blade area of ​​the blade 37 become too small, making it impossible to discharge a sufficient amount of air. For this reason, the clothing fan 1 of Example 1 can suppress the increase in the axial length X of the housing 2 L4 while suppressing the decrease in airflow.

[0091] Furthermore, in the garment fan 1 of Embodiment 1, the second case 20 has a motor housing section 23a capable of housing an electric motor 34, and a connector housing section 23d capable of housing a power supply connector 33 connected to the electric motor 34. The connector housing section 23d is formed in the inner region of the second cylindrical section 22 when viewed along the axial direction X.

[0092] As a result, in the garment fan 1 of Embodiment 1, the power supply connector 33 is not positioned to protrude beyond the outer peripheral surface of the second cylindrical portion 22, preventing the power supply connector 33 from interfering with objects around the garment fan 1, causing malfunctions or becoming an obstruction.

[0093] Furthermore, in the garment fan 1 of Embodiment 1, 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 in the garment fan 1 of Embodiment 1, and prevents the axial length L4 of the housing 2 from increasing.

[0094] (Example 2) The garment fan 1A in Example 2 is detachably attached to the garment 100 (see Figure 1), similar to the garment fan 1 in Example 1, and blows air (outside air) into the inside of the garment 100 to cool the wearer's body.

[0095] In the garment fan 1A of Example 2, as shown in Figure 19, some of the components of the housing 2A differ from those of the housing 2 of Example 1. Note that, since the components of the garment fan 1A of Example 2 are the same as those of the garment fan 1 of Example 1, except for the housing 2A, the same reference numerals are used, and detailed explanations are omitted. Similarly, in the components of the housing 2A, the same reference numerals are used for components similar to those of the housing 2 of Example 1, and detailed explanations are omitted.

[0096] The housing 2A of Example 2 has a first case 10A in which a suction port 11 is formed, and a second case 20A in which a discharge port 21 is formed. In Example 2 as well, the direction in which the suction port 11 and the discharge port 21 face each other is defined as the "axial direction X".

[0097] As shown in Figure 19, the first case 10A has a cylindrical first cylindrical portion 12A, a suction port guard portion 13 that covers the suction port 11, and a pressing portion 14 formed on the first cylindrical portion 12A.

[0098] The first cylindrical portion 12A is a cylindrical member with open ends. The opening at one end forms a suction port 11, and the tip 12a of the other end is screwed into the second cylindrical portion 22A of the second case 20A. A first threaded portion 15A is formed on the outer circumferential surface 12b of the first cylindrical portion 12.

[0099] As shown in Figure 20, the first threaded portion 15A is an external thread formed by a projection that spirally surrounds the outer circumferential surface 12b of the first cylindrical portion 12. The outer diameter of the first threaded portion 15A on the discharge port 21 side (first outer diameter R3, described later) is larger than the inner diameter R5 of the opening 102 formed in the garment 100, while the outer diameter on the suction port 11 side (second outer diameter R4, described later) is smaller than the inner diameter R5 of the opening 102.

[0100] Specifically, as shown in Figure 21, the outer diameter of the first threaded portion 15A from the tip 12a (referred to as "first outer diameter R3") is larger than the inner diameter R5 of the opening 102 formed in the garment 100 (see Figure 19). Furthermore, the outer diameters of the second and third threaded portions 15A from the tip 12a (referred to as "second outer diameter R4") are smaller than the inner diameter R5 of the opening 102.

[0101] Furthermore, "the first threaded portion 15A from the tip 12a" refers to the range of 360° in the circumferential direction of the first cylindrical portion 12A from the starting point S of the thread on the tip 12a side (see Figure 20) of the first threaded portion 15A. Also, "the second threaded portion 15A from the tip 12a" refers to the range of 360° in the circumferential direction of the first cylindrical portion 12A from the end point of the first thread of the first threaded portion 15A. And "the third threaded portion 15A from the tip 12a" refers to the range of the first threaded portion 15A from the end point of the second thread to the starting point of the thread on the suction port 11 side (not shown). "Thread starting point S" is the tip position in the circumferential direction where the thread height reaches a specified dimension from the outer circumferential surface 12b of the first cylindrical portion 12.

[0102] In other words, as shown in the enlarged view in Figure 21, the screw height H1 of the first thread on the tip 12a side of the first threaded portion 15A is set higher than the screw heights H2 of the second and third threads. Preferably, the first outer diameter R3 is about 1 mm to 2 mm larger than the inner diameter R5 of the opening 102, and the second outer diameter R4 is about 0.5 mm 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. Also, if the difference between the second outer diameter R4 and the inner diameter R5 of the opening 102 is too large, it is not possible to secure sufficient screw height H2 from the second thread onward of the first threaded portion 15A.

[0103] As shown in Figure 19, the second case 20A has a cylindrical second cylindrical portion 22A, a discharge port guard portion 23 that covers the discharge port 21, and a finger rest portion 24.

[0104] The second cylindrical portion 22A is a cylindrical member with open ends. The opening at one end forms a discharge port 21, and the first cylindrical portion 12A is screwed into the opening at the other end. A second threaded portion 25A is formed on the inner circumferential surface of the second cylindrical portion 22.

[0105] As shown in Figure 22, the second threaded portion 25A is an internal thread formed by a groove created between projections protruding from the inner circumferential surface 22b of the second cylindrical portion 22A, and connects to the first threaded portion 15A when the first cylindrical portion 12A is screwed into the second cylindrical portion 22A. Here, the second threaded portion 25A is set to a constant thread depth D1 along its entire length. Furthermore, as shown in an enlarged view in Figure 18, the thread depth D1 is set to a size that allows the thread height H1 of the first thread on the tip 12a side of the first threaded portion 15A to connect.

[0106] Furthermore, as shown in Figure 23, the second threaded portion 25A is divided into multiple sections (in this case, six sections at 60° intervals) along the circumferential direction of the second cylindrical portion 22A. "60° interval" means that, when viewed along the axial direction X, the angle θS formed by the straight line LS connecting the center O of the second cylindrical portion 22A and the circumferential center position of adjacent second threaded portions 25A is set to 60°.

[0107] Furthermore, in the circumferential direction of the second cylindrical portion 22A, the arc length AR1 of the continuous portion of the second threaded portion 25A is shorter than the arc length AR2 of the non-threaded portion (the portion where the second threaded portion 25A is not formed) that divides the second threaded portion 25A.

[0108] The operation of the clothing fan 1A in Example 2 will be explained below.

[0109] In the garment fan 1A of Example 2, the first case 10A and the second case 20A are separated in advance, and after the first case 10A is attached to the garment 100, the second case 20A is fixed to the first case 10A.

[0110] At this point, the first case 10A is first inserted into the opening 102 from its tip 12a, and the first thread of the first screw portion 15A on the tip 12a side goes over the edge of the opening 102 and enters the garment 100. Subsequently, the first case 10A is pushed in, and the garment 100 fits around the second thread and beyond of the first screw portion 15A. In this way, the first case 10A is attached to the garment 100.

[0111] Here, the first threaded portion 15A has a first outer diameter R3 that is larger than the inner diameter R5 of the opening 102. Therefore, once the first thread on the tip side 12a of the first threaded portion 15A has passed over the edge of the opening 102, if the first cylindrical portion 12A tries to slip out of the clothing 100, the periphery of the opening 102 will catch on the first threaded portion 15A. As a result, the first case 10A will not spontaneously fall off the clothing 100 even if it is not supported by the wearer's hand.

[0112] Furthermore, the second outer diameter R4 of the first threaded portion 15A is smaller than the inner diameter R5 of the opening 102. Therefore, after the first thread on the tip 12a side of the first threaded portion 15A has passed over the opening 102, the edge of the opening 102 does not interfere with the first threaded portion 15A and does not get caught between the first threaded portion 15A and the second threaded portion 25A.

[0113] As a result, the garment fan 1A of Embodiment 2 prevents the first case 10A from falling off during installation, making it easy to install and improving the ease of installation. In the garment fan 1A of Embodiment 2, since the first outer diameter R3 is larger than the inner diameter R5 of the opening 102, the first case 10A needs to be inserted into the opening 102 at an angle with respect to the axial direction X.

[0114] The clothing fan 1 of the present invention has been described above based on Examples 1 and 2. However, the specific configuration is not limited to these examples, and changes or additions to the design are permitted as long as they do not depart from the gist of the invention as described in each claim.

[0115] In the garment fan 1 of Example 1, an example was shown in which the first case 10 is screwed into the second case 20 and the first threaded portion 15 is coupled to the second threaded portion 25. However, the engagement structure between the first case 10 and the second case 20 is not limited to a threaded 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 the first case 10 and the second case 20 may engage by a claw formed on the first case 10 catching on the second case 20.

[0116] Furthermore, in the garment fan 1 of Example 1, an example was shown in which the discharge side rail member 23b of the discharge port guard portion 23 extends in a direction perpendicular to the axial direction X from the motor housing portion 23a to the bent portion 23g. As a result, the tip of the discharge port guard portion 23 is flat, but the shape of the discharge port guard portion 23 is not limited to this. The discharge side rail member 23b may be curved in a direction that protrudes from the discharge port 21 with respect to the motor housing portion 23a. In addition, the suction port guard portion 13 may be discharged to the outside of the housing 2 beyond the suction port 11.

[0117] Furthermore, in the garment fan 1 of Example 1, an example was shown in which the blade member 32 has five blades 37. However, the number of blades 37 can be set arbitrarily. In addition, the projected area, chord length Lα, pitch angle θ, etc. of each blade 37 can also be set arbitrarily.

[0118] Furthermore, in the garment fan 1 of Example 1, an example was shown in which the electric motor 34 was configured as a DC brushless motor. However, any motor can be used for the electric motor 34, and may, for example, be a brushed DC motor having a commutator and brushes.

[0119] Furthermore, in Example 2, an example was shown in which the outer diameter of the first threaded portion 15A from the tip 12a to the first thread was larger than the inner diameter R5 of the opening 102, and the outer diameter of the first threaded portion 15A from the second thread onward to the tip 12a was smaller than the inner diameter R5 of the opening 102. However, it is sufficient if the outer diameter of the first threaded portion 15A on the suction port 11 side is smaller than the inner diameter R5 of the opening 102, and the outer diameter of the first threaded portion 15A on the discharge port 21 side is larger than the inner diameter R5 of the opening 102.

[0120] Therefore, for example, the outer diameter of the first threaded portion 15A from the tip 12a of the first cylindrical portion 12A to the first and second threads may be larger than the inner diameter R5 of the opening 102, and the outer diameter of the first threaded portion 15A from the tip 12a to the third thread may be smaller than the inner diameter R5 of the opening 102.

[0121] Furthermore, in the garment fan 1A of Example 2, an example was shown in which the first screw portion 15A formed on the first case 10A was formed up to the third thread, but the number of threads of the first screw portion 15A can be set arbitrarily. [Explanation of symbols]

[0122] 1. Clothing fan 2 Housing 3. Fan body 10. Case 1 11 Inlet 12 First cylinder part 12a Tip 13. Suction side guard section 15 First threaded section 20. Case 2 21 Discharge port 22 Second cylinder part 23 Discharge side guard section 23a Motor housing 23d Connector storage compartment 25 Second threaded section 34 Electric motor 36 Hubs 36a Shaft body 36b Shaft end face 37 feathers 37b Chord section 37c The tip of the wing at the circumferential center of the chord section. 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 Housing axial length Lα Chord length R1 Diameter of the shaft barrel R2 Diameter of the blade component

Claims

1. A clothing fan comprising a hollow housing having an intake port and an outlet port facing the intake port, and a fan body disposed inside the housing, which is attached to clothing and blows air into the clothing, The housing comprises a first case having a cylindrical first cylindrical portion with the suction port formed at one end, and a second case having a cylindrical second cylindrical portion with the discharge port formed at one end and into which the first cylindrical portion is inserted. The fan body has a plurality of blades that are rotated by an electric motor held in the second case and blow air from the intake 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 inner diameter of the second cylindrical portion is larger than the inner diameter of the first cylindrical portion along the entire length in the axial direction. The tip of the first cylindrical portion on the discharge side is set to be closer to the intake port than the tip of the blade at the center of the chord portion of the blade. The first cylindrical portion has a first threaded portion formed on its outer surface. The second cylindrical portion has a second threaded portion formed on its inner circumferential surface that connects to the first threaded portion. The first threaded portion is formed by a projection surrounding the outer circumferential surface of the first cylindrical portion, and the outer diameter on the suction side is smaller than the outer diameter on the discharge side. A clothing fan characterized by the following features.

2. In the clothing fan described in claim 1, When the direction in which the suction port and the discharge port face each other is defined as the axial direction, the axial length of the first cylindrical portion is set to 10 mm or more. A clothing fan characterized by the following features.

3. In a clothing fan according to claim 1 or claim 2, The electric motor is fitted with a hub having a cylindrical shaft body surrounding the electric motor and a shaft end face that closes one end of the shaft body and faces the intake port. The plurality of blades are provided on the outer circumferential surface of the shaft body at regular intervals, and at least a portion of them protrudes from the shaft end face toward the intake port. A clothing fan characterized by the following features.

4. In a clothing fan according to claim 1 or claim 2, The electric motor is fitted with a hub having a cylindrical shaft body surrounding the electric motor and a shaft end face that closes one end of the shaft body and faces the intake port. The plurality of blades are provided on the outer circumferential surface of the shaft body at regular intervals. The ratio of the diameter of the shaft body to the diameter of the blade member, which is composed of the hub and the plurality of blades, is set to less than 40%. A clothing fan characterized by the following features.

5. In a clothing fan according to claim 1 or claim 2, When the direction in which the suction port and the discharge port face each other is defined as the axial direction, The ratio of the axial length of the blade to the axial length of the housing is set to be 45% or more and 60% or less. A clothing fan characterized by the following features.

6. In a clothing fan according to claim 1 or claim 2, The second case has a motor housing section capable of housing the electric motor and a connector housing section capable of housing a power supply connector connected to the electric motor, When the direction in which the suction port and the discharge port face each other is defined as the axial direction, The connector housing is formed in the inner region of the second cylindrical portion when viewed along the axial direction. A clothing fan characterized by the following features.

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