Ventilator

Abstract

To obtain a ventilation fan which enables the common use of support legs in both of a case where the ventilation fan is used for air exhaustion and a case where the ventilation fan is used for air supply.SOLUTION: A ventilation fan 100 includes: a body frame 1 having a wind tunnel part 11; a motor holding part 2 arranged spaced apart from the wind tunnel part 11; support legs 3 supporting the motor holding part 2; a motor 4 fixed to the motor holding part 2; and blades 5. On an inner peripheral surface of the motor holding part 2, an annular first flange part 21 extending toward the inside in a radial direction of the wind tunnel part 11. The motor 4 has: a housing 41; and a second flange part 42 extending from an outer peripheral surface of the housing 41 toward the outside in a radial direction and fixed to the first flange part 21. The second flange part 42 is disposed at one axial side of the first flange part 21. The ventilation fan 100 is configured to be able to select whether or not a spacer 6 is disposed between the first flange part 21 and the second flange part 42.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a ventilation fan that generates an air flow by rotating blades. [Background technology]

[0002] Conventionally, there are known ventilation fans that are installed on the walls, ceilings, etc. of buildings. The ventilation fan generally includes a main body frame having a cylindrical air tunnel, a cylindrical motor holding part that is disposed apart from the air tunnel along the axial direction of the air tunnel, support legs that extend from the main body frame toward the motor holding part and support the motor holding part, a motor that is disposed inside the motor holding part and fixed to the motor holding part, and blades attached to the motor.

[0003] Conventionally, in order to realize the first-class ventilation that mechanically supplies both the outdoor air to the room and the indoor air to the outside, exhaust fans for exhaust only and intake fans for intake only have been developed. However, when exhaust fans and intake fans are developed separately, it is necessary to prepare parts such as support legs, blades, and motors separately, which increases the cost of development, molds, management, etc.

[0004] As a solution to these problems, Patent Document 1 discloses a ventilation fan that has a motor that can rotate in both forward and reverse directions, and the air blowing direction can be switched by changing the rotation direction of the motor, making it usable for both exhaust and supply air. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-055214 Summary of the Invention [Problem to be solved by the invention]

[0006] In general, the shape of the blades is designed to achieve high airflow efficiency and low noise during forward rotation. In other words, the shape of the blades is not symmetrical on the front and back. For this reason, the method of changing the rotation direction of the motor as in Patent Document 1 has the problem of reduced airflow efficiency and increased noise when used for either exhaust or intake purposes.

[0007] To solve this problem, it is conceivable to flip the blades over and attach them to the motor when changing the direction of rotation of the motor, but in that case, the blades would not be symmetrical on the front and back, and there is a possibility that the blades would protrude from the end face of the product when used for either exhaust or intake purposes.To prevent the blades from protruding from the end face of the product, it is necessary to change the height of the support legs and change the position of the blades in the axial direction when used for exhaust or intake purposes, so it is not possible to share the support legs.

[0008] The present disclosure has been made in consideration of the above, and aims to obtain a ventilation fan that can use the same support legs when used for exhaust purposes and when used for air supply purposes. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, the ventilation fan according to the present disclosure includes a main body frame having a cylindrical air tunnel, a cylindrical motor holder disposed along the axial direction of the air tunnel away from the air tunnel, a support leg extending from the main body frame toward the motor holder to support the motor holder, a motor at least a part of which is disposed inside the motor holder and fixed to the motor holder, and a blade attached to the motor and rotates with the rotation of the motor to generate an air flow. An annular first flange portion extending toward the inside in the radial direction of the air tunnel is formed on the inner peripheral surface of the motor holder. The motor has a housing inserted into an opening formed by being surrounded by the first flange portion, and a second flange portion extending toward the outside in the radial direction from the outer peripheral surface of the housing and fixed to the first flange portion. The second flange portion is disposed on one side of the first flange portion in the axial direction. The fan is configured to be able to select whether a spacer having a thickness in the axial direction is disposed between the first flange portion and the second flange portion, or whether a spacer is not disposed between the first flange portion and the second flange portion. Effect of the Invention

[0010] The ventilation fan according to the present disclosure has the advantage that the support legs can be shared whether the fan is used for exhaust purposes or for supplying air. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an overall configuration of an exhaust type ventilation fan according to a first embodiment; [Diagram 2] FIG. 1 is an exploded perspective view showing an overall configuration of an exhaust type ventilation fan according to a first embodiment. [Diagram 3] FIG. 1 is an exploded perspective view showing an overall configuration of an intake type ventilation fan according to a first embodiment. [Figure 4] FIG. 1 is a perspective view showing a spacer according to a first embodiment; [Diagram 5] FIG. 1 is a cross-sectional view showing a schematic diagram of a motor holder, a motor, and a spacer of an exhaust type ventilation fan according to a first embodiment; [Figure 6]FIG. 1 is a cross-sectional view showing a motor holder, a motor, and a spacer of an intake type ventilation fan according to a first embodiment; [Figure 7] FIG. 13 is an exploded perspective view showing the overall configuration of an exhaust type ventilation fan according to a second embodiment. [Figure 8] FIG. 13 is an exploded perspective view showing the overall configuration of an intake type ventilation fan according to a second embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing a schematic diagram of a motor holder, a motor, and a spacer of an exhaust type ventilation fan according to a second embodiment. [Figure 10] FIG. 11 is a cross-sectional view showing a motor holder, a motor, and a spacer of an intake type ventilation fan according to a second embodiment. [Figure 11] FIG. 13 is an exploded perspective view showing the overall configuration of an exhaust type ventilation fan according to a third embodiment. [Figure 12] FIG. 13 is an exploded perspective view showing the overall configuration of an intake type ventilation fan according to a third embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a schematic diagram of a motor holder, a motor, and a spacer of an exhaust type ventilation fan according to a third embodiment. [Figure 14] FIG. 13 is a cross-sectional view showing a motor holder, a motor, and a spacer of an intake type ventilation fan according to a third embodiment. [Figure 15] FIG. 13 is a view of a spacer according to a modification of the third embodiment, viewed along the axial direction. [Figure 16] FIG. 13 is a diagram showing a first spacer and a motor in a modification of the third embodiment as viewed in the axial direction, the first spacer and the motor as viewed from the air tunnel side; [Figure 17] FIG. 13 is a diagram showing a second spacer and a motor in a modification of the third embodiment as viewed in the axial direction, the second spacer and the motor as viewed from the opposite side to the air tunnel portion; [Figure 18] A cross-sectional view taken along line XVIII-XVIII shown in FIG. 16. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Exhaust fans according to embodiments of the present invention will be described in detail below with reference to the drawings.

[0013] Embodiment 1 Fig. 1 is a perspective view showing the overall configuration of exhaust type ventilation fan 110 according to embodiment 1. Fig. 2 is an exploded perspective view showing the overall configuration of exhaust type ventilation fan 110 according to embodiment 1. Fig. 3 is an exploded perspective view showing the overall configuration of supply type ventilation fan 120 according to embodiment 1. As shown in Figs. 1 to 3, exhaust type ventilation fan 110 and supply type ventilation fan 120 are configured from common parts except for main body frame 1, which will be described later.

[0014] In the following description, exhaust type ventilation fan 110 and supply type ventilation fan 120 may be collectively referred to as ventilation fan 100. Arrow X1 shown in FIG. 2 and arrow X2 shown in FIG. 3 indicate the air blowing direction of ventilation fan 100. Arrow Y1 shown in FIG. 2 and arrow Y2 shown in FIG. 3 indicate the rotation direction of motor 4, which will be described later. Rotation direction Y1 and rotation direction Y2 are opposite to each other. In this embodiment, rotation direction Y1 of motor 4 in exhaust type ventilation fan 110 is defined as forward rotation, and rotation direction Y2 of motor 4 in supply type ventilation fan 120 is defined as reverse rotation.

[0015] As shown in Fig. 1, the ventilation fan 100 includes a main body frame 1, a motor holder 2, a plurality of support legs 3, a motor 4, blades 5, and a spacer 6. The size and shape of the air duct 11 differs between the exhaust type ventilation fan 110 and the supply type ventilation fan 120, but the function of the main body frame 1 is the same, so they are denoted by the same reference numerals and described below. In this embodiment, when manufacturing the exhaust type ventilation fan 110 and the supply type ventilation fan 120, it is assumed that the support legs 3 described below are designed based on the exhaust type ventilation fan 110, and when manufacturing the supply type ventilation fan 120, the axial position of the blades 5 is adjusted by the spacer 6.

[0016] The main body frame 1 is a member fixed to a wall or ceiling of a building (not shown). The main body frame 1 has an air tunnel section 11 and a fixing section 12. The air tunnel section 11 is formed in a cylindrical shape having a central axis C. In the following, when describing the directions of each component of the ventilator fan 100, the direction parallel to the central axis C is referred to as the axial direction, the direction perpendicular to the central axis C is referred to as the radial direction, and the rotation direction around the central axis C is referred to as the circumferential direction.

[0017] The shape of the air tunnel 11 is not particularly limited as long as it is a tubular shape that allows ventilation, but in this embodiment it is cylindrical. The fixing part 12 is a plate-like part on which screws are provided for fixing the ventilation fan 100 to a wall or ceiling of a building. The fixing part 12 extends in the radial direction from one end in the axial direction of the outer circumferential surface of the air tunnel 11. The outer circumferential shape of the fixing part 12 when viewed along the axial direction is not particularly limited, but in this embodiment it is rectangular.

[0018] The motor holding part 2 is a cylindrical member arranged away from the air tunnel part 11 along the axial direction. The motor holding part 2 is arranged coaxially with the central axis C of the air tunnel part 11. The motor holding part 2 serves to hold the motor 4. The shape of the motor holding part 2 is not particularly limited as long as it is capable of holding the motor 4, but in this embodiment, it is a square cylindrical shape.

[0019] As shown in Figs. 2 and 3, an annular first flange portion 21 extending radially inward is formed on the inner peripheral surface of the motor holding portion 2. The inner peripheral shape of the first flange portion 21 when viewed along the axial direction is generally circular. The outer peripheral shape of the first flange portion 21 when viewed along the axial direction is rectangular. A plurality of first screw holes 22 penetrating along the axial direction are formed in the first flange portion 21. The plurality of first screw holes 22 are arranged at equal angular intervals in the circumferential direction. The shape of the first screw holes 22 is circular. An opening 23 into which the motor 4 is inserted is formed in a portion of the motor holding portion 2 surrounded by the first flange portion 21.

[0020] The support legs 3 are members that extend from the main body frame 1 toward the motor holding part 2 and support the motor holding part 2. The motor holding part 2 is connected to the main body frame 1 via a plurality of support legs 3. The number and arrangement of the support legs 3 are not particularly limited as long as the motor holding part 2 can be connected to the main body frame 1. In this embodiment, four support legs 3 are arranged to connect the four corners of the fixing part 12 to the motor holding part 2. The base end of each support leg 3 and the fixing part 12 of the main body frame 1 are fastened together to the wall of a building or the like by screws (not shown). The tips of two adjacent support legs 3 are connected to each other via flat connecting parts 31. The connecting parts 31 are fixed to the outer peripheral surface of the motor holding part 2 by welding or the like.

[0021] As shown in Fig. 1, at least a portion of the motor 4 is disposed inside the motor holding portion 2 and fixed to the motor holding portion 2. The remaining portion of the motor 4 protrudes from the motor holding portion 2 toward the air tunnel portion 11. The motor 4 is capable of forward and reverse rotation. As shown in Figs. 2 and 3, the motor 4 has a housing 41 inserted into an opening 23 formed by being surrounded by the first flange portion 21, a second flange portion 42 extending radially outward from the outer circumferential surface of the housing 41 and fixed to the first flange portion 21, and a shaft 43.

[0022] The housing 41 is a metal member that constitutes the outer shell of the motor 4. The housing 41 is a hollow member that houses a stator, a rotor, and the like (not shown). The outer peripheral shape of the housing 41 when viewed along the axial direction is circular. A part of the shaft 43 protrudes from one end of the housing 41 along the axial direction toward the air tunnel portion 11. The blades 5 are attached to the protruding portion of the shaft 43. The second flange portion 42 is formed with a plurality of second screw holes 44 that penetrate along the axial direction. The plurality of second screw holes 44 are arranged at equal angles apart in the circumferential direction. A portion of the second flange portion 42 is formed with a plurality of mounting portions 45 that protrude radially outward from the other portions. The plurality of mounting portions 45 are spaced at equal angles apart in the circumferential direction. The second screw holes 44 are formed one by one in each mounting portion 45. The shape of the second screw holes 44 is circular.

[0023] The blade 5 is a member that is attached to the motor 4 and rotates with the rotation of the motor 4 to generate an airflow. The blade 5 is disposed inside the air tunnel 11. The blade 5 has an asymmetric shape. The blade 5 has a pressure surface 51 that faces the downstream side of the airflow and a negative pressure surface 52 that faces the upstream side of the airflow. The pressure surface 51 is the surface of the blade 5 from which the airflow flows out when the motor 4 and the blade 5 are rotated. The negative pressure surface 52 is the surface of the blade 5 from which the airflow flows in when the motor 4 and the blade 5 are rotated. The negative pressure surface 52 is the surface that faces the opposite side to the pressure surface 51.

[0024] In the exhaust type ventilation fan 110 shown in Fig. 2, when the motor 4 rotates forward, the blades 5 attached to the motor 4 rotate forward inside the air tunnel 11, generating an airflow from the motor holding part 2 to the air tunnel 11. In the supply type ventilation fan 120 shown in Fig. 3, when the motor 4 rotates reversely, the blades 5 attached to the motor 4 rotate reversely inside the air tunnel 11, generating an airflow from the air tunnel 11 to the motor holding part 2. When changing the rotation direction of the motor 4, that is, between the exhaust type ventilation fan 110 shown in Fig. 2 and the supply type ventilation fan 120 shown in Fig. 3, the blades 5 are attached to the motor 4 with the front and back reversed.

[0025] The spacer 6 is a member for adjusting the axial position of the blade 5 relative to the air tunnel 11. FIG. 4 is a perspective view showing the spacer 6 in the first embodiment. The shape of the spacer 6 is not particularly limited, but in the present embodiment, it is a flat plate. The outer peripheral shape of the spacer 6 when viewed along the axial direction is rectangular. Metal is used as the material of the spacer 6. The metal is, for example, aluminum or an aluminum alloy. An insertion hole 61 into which the motor 4 is inserted is formed in the center of the spacer 6. The insertion hole 61 is circular in shape. A plurality of third screw holes 62 are formed in the spacer 6, penetrating along the axial direction. The plurality of third screw holes 62 are arranged at equal angles apart in the circumferential direction. The third screw holes 62 are circular in shape. As shown in FIGS. 2 and 3, the outer peripheral dimension of the spacer 6 is set to be equal to or smaller than the inner peripheral dimension of the motor holding portion 2. The spacer 6 can be accommodated inside the motor holding portion 2.

[0026] Here, the first flange portion 21, the second flange portion 42, and the spacer 6 will be further described with reference to Figures 5 and 6. Figure 5 is a cross-sectional view that shows a schematic of the motor holding portion 2, the motor 4, and the spacer 6 of the exhaust type ventilation fan 110 according to the first embodiment. Figure 6 is a cross-sectional view that shows a schematic of the motor holding portion 2, the motor 4, and the spacer 6 of the supply type ventilation fan 120 according to the first embodiment. For simplification, Figures 5 and 6 show the appearance of the housing 41 rather than a cross-section.

[0027] As shown in FIG. 5 and FIG. 6, the second flange portion 42 is disposed on one side of the first flange portion 21 in the axial direction. The ventilation fan 100 is configured to be able to select whether to dispose a spacer 6 having a thickness in the axial direction between the first flange portion 21 and the second flange portion 42, or to dispose no spacer 6 between the first flange portion 21 and the second flange portion 42. In this embodiment, the spacer 6 is disposed at least one of between the first flange portion 21 and the second flange portion 42, and on the opposite side of the second flange portion 42 across the first flange portion 21. The first flange portion 21, the second flange portion 42, and the spacer 6 are overlapped with each other and fixed by the screws 7.

[0028] In an exhaust type ventilation fan 110 shown in Fig. 5, the second flange portion 42, the first flange portion 21, and the spacer 6 overlap in this order along the axial direction from the air tunnel 11 side shown in Fig. 2. In an intake type ventilation fan 120 shown in Fig. 6, the first flange portion 21, the spacer 6, and the second flange portion 42 overlap in this order along the axial direction from the air tunnel 11 side shown in Fig. 3. In Figs. 5 and 6, the lower side of the paper is the air tunnel 11 side.

[0029] Next, the effects of the ventilation fan 100 according to the present embodiment will be described.

[0030] When manufacturing the exhaust type ventilation fan 110 shown in FIG. 2, as shown in FIG. 5, the motor 4, the motor holding part 2 and the spacer 6 are arranged so that the second flange part 42, the first flange part 21 and the spacer 6 overlap in this order along the axial direction from the air tunnel part 11 side. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically on the air tunnel part 11 side of the first flange part 21. The second flange part 42 is arranged between the first flange part 21 and the air tunnel part 11. The spacer 6 is arranged on the opposite side of the second flange part 42 across the first flange part 21. The spacer 6 is not arranged between the first flange part 21 and the second flange part 42. The spacer 6 is arranged on the opposite side of the air tunnel part 11 across the first flange part 21 and the second flange part 42. The first flange part 21 is sandwiched between the second flange part 42 and the spacer 6. The first flange portion 21, the second flange portion 42, and the spacer 6 are overlapped with each other and fixed by the screws 7. The motor holding portion 2 and the motor 4 are directly connected without the spacer 6. When manufacturing the exhaust type ventilation fan 110 shown in FIG. 2, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the downstream side of the air flow and the negative pressure surface 52 of the blades 5 faces the upstream side of the air flow. When the motor 4 is rotated in the forward direction, the blades 5 are attached to the motor 4 so that the negative pressure surface 52 of the blades 5 faces the motor holding portion 2.

[0031] On the other hand, when manufacturing the supply type ventilation fan 120 shown in FIG. 3, the motor holding part 2, the spacer 6, and the motor 4 are arranged so that the first flange part 21, the spacer 6, and the second flange part 42 overlap in this order along the axial direction from the air tunnel part 11 side, as shown in FIG. 6. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically on the opposite side to the air tunnel part 11 with the first flange part 21 in between. The spacer 6 is arranged between the first flange part 21 and the second flange part 42. The first flange part 21, the second flange part 42, and the spacer 6 are overlapped with each other and fixed by the screw 7. The motor holding part 2 and the motor 4 are indirectly connected via the spacer 6. 3, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the downstream side of the airflow and the negative pressure surface 52 of the blades 5 faces the upstream side of the airflow. When the motor 4 is rotated in the reverse direction, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the motor holder 2.

[0032] Generally speaking, if the support legs are designed based on an exhaust type ventilator, the positional relationship between the air tunnel and the blades in the supply type ventilator may not match, resulting in a decrease in air volume and increased noise. Also, if the support legs are designed based on an exhaust type ventilator, in order to prevent the blades from protruding from the end face of the product in the supply type ventilator, the height of the support legs of the supply type ventilator must be higher than the height of the support legs of the exhaust type ventilator. In other words, in the supply type ventilator, the position of the blades in the axial direction must be farther away from the air tunnel than in the exhaust type ventilator.

[0033] In this regard, in the supply-type ventilation fan 120 shown in FIG. 3, the axial position of the blades 5 is farther away from the air tunnel portion 11 by the thickness of the spacer 6, the thickness of the first flange portion 21, and the thickness of the second flange portion 42, compared to the exhaust-type ventilation fan 110 shown in FIG. 2.

[0034] As described above, in this embodiment, as shown in FIG. 2 and FIG. 3, the second flange portion 42 is disposed on one side of the first flange portion 21 in the axial direction, and it is possible to select whether to dispose the spacer 6 having a thickness in the axial direction between the first flange portion 21 and the second flange portion 42, or to dispose the spacer 6 between the first flange portion 21 and the second flange portion 42. As a result, the axial positions of the motor 4 and the blades 5 relative to the air tunnel portion 11 can be adjusted simply by disposing or not disposing the spacer 6 between the first flange portion 21 and the second flange portion 42. Therefore, even if the blades 5, which have an asymmetric shape, are reversed and attached to the motor 4, the axial positions of the blades 5 can be adjusted so that the blades 5 do not protrude from the end surface of the product. In other words, since it is not necessary to change the height of the support legs 3 to change the position of the blades 5 in the axial direction between the exhaust type ventilation fan 110 and the supply type ventilation fan 120, the support legs 3 can be used in common for both exhaust and supply purposes. Therefore, costs such as development costs, mold costs, and management costs can be reduced. When the spacer 6 is not disposed between the first flange portion 21 and the second flange portion 42 as in the exhaust type ventilation fan 110 of this embodiment, the spacer 6 does not contribute to adjusting the axial positions of the motor 4 and the blades 5 relative to the air tunnel portion 11, so the spacer 6 may be omitted. The product end face refers to the end face of the main body frame 1 that faces the mounting surface on the building side, i.e., the end face of the main body frame 1 that faces away from the motor holding portion 2.

[0035] 2 and 3, in order to reverse the airflow direction X1 of exhaust type ventilation fan 110 and the airflow direction X2 of supply type ventilation fan 120, it is necessary to change the rotation direction of motor 4 between exhaust type ventilation fan 110 and supply type ventilation fan 120. In this regard, in the present embodiment, since motor 4 can rotate forward and backward, a common motor 4 can be used for exhaust type ventilation fan 110 and supply type ventilation fan 120. In other words, the support leg 3 can be shared between the case of use for exhaust application and the case of use for air supply application.

[0036] Also, depending on the shape of the blades 5, by using the same support legs 3 for both the exhaust type ventilation fan 110 and the supply type ventilation fan 120 and using spacers 6 to adjust the axial position of the blades 5, it may be possible to share the main frame 1 for both exhaust and supply purposes.

[0037] The shapes of the housing 41 and the motor holding part 2 shown in FIG. 2 and FIG. 3 are not limited to the illustrated examples, and may be changed as appropriate. The shape, material, and plate thickness of the spacer 6 shown in FIG. 4 are not limited to the illustrated examples, and may be changed as appropriate to match the motor holding part 2 and the support leg 3. For example, the shape of the spacer 6 is flat in this embodiment, but it may be a shape with fin-like protrusions. In this way, the surface area of ​​the spacer 6 is increased, making it easier to dissipate heat transferred from the motor 4 to the spacer 6, and the rise in temperature of the motor 4 can be suppressed. In addition, if a material with high thermal conductivity such as aluminum or an aluminum alloy is used as the material of the spacer 6, the heat of the motor 4 can be efficiently transferred to the spacer 6, and the rise in temperature of the motor 4 can be further suppressed.

[0038] Embodiment 2 Next, referring to Figs. 7 to 10, a ventilation fan 100A according to a second embodiment will be described. Fig. 7 is an exploded perspective view showing the overall configuration of an exhaust type ventilation fan 110A according to the second embodiment. Fig. 8 is an exploded perspective view showing the overall configuration of an air supply type ventilation fan 120A according to the second embodiment. Fig. 9 is a cross-sectional view showing a motor holding part 2, a motor 4, and a spacer 6 of an exhaust type ventilation fan 110A according to the second embodiment. Fig. 10 is a cross-sectional view showing a motor holding part 2, a motor 4, and a spacer 6 of an air supply type ventilation fan 120A according to the second embodiment. In this embodiment, the positional relationship in the axial direction of the spacer 6, the first flange part 21, and the second flange part 42 is different from that of the first embodiment. In the second embodiment, the same reference numerals are used for parts that overlap with those of the first embodiment, and description thereof will be omitted.

[0039] In this embodiment, when manufacturing the exhaust type ventilation fan 110A shown in Figure 7 and the supply type ventilation fan 120A shown in Figure 8, it is assumed that the support legs 3 are designed based on the supply type ventilation fan 120A, and when manufacturing the exhaust type ventilation fan 110A, the axial position of the blades 5 is adjusted using spacers 6.

[0040] When manufacturing the supply type ventilation fan 120A shown in FIG. 8, as shown in FIG. 10, the spacer 6, the motor holding part 2 and the motor 4 are arranged so that the spacer 6, the first flange part 21 and the second flange part 42 overlap in this order along the axial direction from the air tunnel part 11 side. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically on the opposite side to the air tunnel part 11 with the first flange part 21 in between. In addition, in FIG. 9 and FIG. 10, the lower side of the paper is the air tunnel part 11 side. The spacer 6 is arranged on the opposite side to the second flange part 42 with the first flange part 21 in between. The spacer 6 is not arranged between the first flange part 21 and the second flange part 42. The spacer 6 is arranged on the air tunnel part 11 side of the first flange part 21. The first flange part 21 is sandwiched between the second flange part 42 and the spacer 6. The first flange portion 21, the second flange portion 42, and the spacer 6 are overlapped with each other and fixed by the screws 7. The motor holder 2 and the motor 4 are directly connected without the spacer 6. When manufacturing the air supply type ventilation fan 120A shown in FIG. 8, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the motor 4 side so as to face the downstream side of the air flow, and the negative pressure surface 52 of the blades 5 faces the upstream side of the air flow. When the motor 4 is rotated in the reverse direction, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the motor holder 2.

[0041] On the other hand, when manufacturing the exhaust type ventilation fan 110A shown in FIG. 7, as shown in FIG. 9, the motor 4, the spacer 6, and the motor holding part 2 are arranged so that the second flange part 42, the spacer 6, and the first flange part 21 overlap in this order along the axial direction from the air tunnel part 11 side. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically on the air tunnel part 11 side. The second flange part 42 is arranged between the first flange part 21 and the air tunnel part 11. The spacer 6 is arranged between the first flange part 21 and the second flange part 42. The first flange part 21, the second flange part 42, and the spacer 6 are overlapped with each other and fixed by the screw 7. The motor holding part 2 and the motor 4 are indirectly connected via the spacer 6. 7, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the downstream side of the airflow and the negative pressure surface 52 of the blades 5 faces the upstream side of the airflow. When the motor 4 is rotated in the forward direction, the blades 5 are attached to the motor 4 so that the negative pressure surface 52 of the blades 5 faces the motor holder 2.

[0042] Generally speaking, if the support legs are designed based on an intake type fan, the positional relationship between the air tunnel and the blades in the exhaust type fan may not match, resulting in a decrease in air volume and increased noise. Also, in an exhaust type fan, the position of the blades in the axial direction needs to be closer to the air tunnel than in an intake type fan.

[0043] In this regard, in the exhaust type ventilation fan 110A shown in FIG. 7, the axial position of the blades 5 is closer to the air tunnel portion 11 by the thickness of the spacer 6 and the thicknesses of the first flange portion 21 and the second flange portion 42, compared to the supply type ventilation fan 120A shown in FIG. 8.

[0044] This embodiment can also achieve the same effect as the first embodiment. In addition, in this embodiment, even if the structure of the first embodiment cannot be realized due to the positional relationship between the blades 5 and the support legs 3, the support legs 3 can be shared. In addition, in this embodiment, the support legs 3 and the blades 5 can be separated in the exhaust type ventilation fan 110A, so noise can be suppressed. Note that, when the spacer 6 is not disposed between the first flange portion 21 and the second flange portion 42 as in the supply type ventilation fan 120A of this embodiment, the spacer 6 does not contribute to adjusting the axial position of the motor 4 and the blades 5 relative to the air tunnel portion 11, so the spacer 6 may be omitted.

[0045] Embodiment 3 Next, referring to Figs. 11 to 14, a ventilation fan 100B according to a third embodiment will be described. Fig. 11 is an exploded perspective view showing the overall configuration of an exhaust type ventilation fan 110B according to the third embodiment. Fig. 12 is an exploded perspective view showing the overall configuration of an air supply type ventilation fan 120B according to the third embodiment. Fig. 13 is a cross-sectional view showing a motor holding portion 2, a motor 4, and a spacer 6 of an exhaust type ventilation fan 110B according to the third embodiment. Fig. 14 is a cross-sectional view showing a motor holding portion 2, a motor 4, and a spacer 6 of an air supply type ventilation fan 120B according to the third embodiment. This embodiment differs from the first and second embodiments in that the spacers 6 are arranged on both sides of the first flange portion 21 in the axial direction. In the third embodiment, the same reference numerals are used for parts that overlap with the first and second embodiments, and description thereof will be omitted.

[0046] As shown in Figs. 11 and 12, the second flange portion 42 is disposed on one side of the first flange portion 21 in the axial direction. The number of spacers 6 is two. One spacer 6 is disposed on one side of the first flange portion 21 in the axial direction and the other side. The spacers 6 are disposed between the first flange portion 21 and the second flange portion 42, and on both sides of the first flange portion 21 opposite the second flange portion 42. When distinguishing between the two spacers 6, one spacer 6 is referred to as a first spacer 6A, and the other spacer 6 is referred to as a second spacer 6B.

[0047] When manufacturing the exhaust type ventilation fan 110B shown in FIG. 11, as shown in FIG. 13, the motor 4, the first spacer 6A, the motor holding part 2, and the second spacer 6B are arranged so that the second flange part 42, the first spacer 6A, the first flange part 21, and the second spacer 6B overlap in this order along the axial direction from the air tunnel part 11 side. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically on the air tunnel part 11 side of the first flange part 21. In addition, in FIG. 13 and FIG. 14, the lower side of the paper surface is the air tunnel part 11 side. The second flange part 42 is arranged between the first flange part 21 and the air tunnel part 11. The first spacer 6A is arranged between the first flange part 21 and the second flange part 42. The first spacer 6A is sandwiched between the first flange part 21 and the second flange part 42. The second spacer 6B is disposed on the opposite side of the second flange portion 42 across the first flange portion 21. The second spacer 6B is not disposed between the first flange portion 21 and the second flange portion 42. The second spacer 6B is disposed on the opposite side of the air tunnel portion 11 across the first flange portion 21, the first spacer 6A, and the second flange portion 42. The first flange portion 21, the second flange portion 42, the first spacer 6A, and the second spacer 6B are overlapped with each other and fixed by the screws 7. The motor holding portion 2 and the motor 4 are indirectly connected via the first spacer 6A. In addition, when manufacturing the exhaust type ventilation fan 110B shown in FIG. 11, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the downstream side of the air flow and the negative pressure surface 52 of the blades 5 faces the upstream side of the air flow. When the motor 4 is rotated in the forward direction, the blade 5 is attached to the motor 4 so that the negative pressure surface 52 of the blade 5 faces the motor holder 2 .

[0048] On the other hand, when manufacturing the supply type ventilation fan 120B shown in FIG. 12, as shown in FIG. 14, the first spacer 6A, the motor holding part 2, the second spacer 6B, and the motor 4 are arranged so that the first spacer 6A, the first flange part 21, the second spacer 6B, and the second flange part 42 overlap in this order along the axial direction from the air tunnel part 11 side. As a result, the second flange part 42 is arranged on one side of the axial direction of the first flange part 21, specifically, on the opposite side to the air tunnel part 11 with the first flange part 21 in between. The second flange part 42 is arranged on the opposite side to the air tunnel part 11 with the first spacer 6A, the first flange part 21, and the second spacer 6B in between. The first spacer 6A is arranged on the opposite side to the second flange part 42 with the first flange part 21 in between. The first spacer 6A is not arranged between the first flange part 21 and the second flange part 42. The first spacer 6A is disposed on the air tunnel 11 side of the first flange portion 21. The first spacer 6A is disposed between the first flange portion 21 and the air tunnel portion 11. The second spacer 6B is disposed between the first flange portion 21 and the second flange portion 42. The second spacer 6B is sandwiched between the first flange portion 21 and the second flange portion 42. The first flange portion 21, the second flange portion 42, the first spacer 6A, and the second spacer 6B are overlapped with each other and fixed by the screws 7. The motor holder 2 and the motor 4 are indirectly connected via the second spacer 6B. When manufacturing the supply type ventilation fan 120B shown in FIG. 12, the blades 5 are attached to the motor 4 so that the pressure surface 51 of the blades 5 faces the downstream side of the air flow and the negative pressure surface 52 of the blades 5 faces the upstream side of the air flow. When the motor 4 is rotated in the reverse direction, the blades 5 are attached to the motor 4 so that the pressure surfaces 51 of the blades 5 face the motor holder 2. Between the exhaust type ventilation fan 110B and the supply type ventilation fan 120B, the axial position of the blades 5 can be changed by the thicknesses of the two spacers 6, the thicknesses of the first flange portion 21, and the thicknesses of the second flange portion 42.

[0049] This embodiment can also achieve the same effects as those of the first and second embodiments. In addition, in this embodiment, even if the structures of the first and second embodiments cannot be realized, the support leg 3 can be shared. For example, when the blade 5 is attached to the motor 4 with the front and back reversed as shown in Figs. 11 and 12, the blade 5 may come into contact with the support leg 3 depending on the shape and height of the blade 5. In this respect, in this embodiment, the spacer 6 is arranged on both sides of the first flange portion 21 in the axial direction, which increases the freedom of selection of the position of the blade 5 in the axial direction compared to the case where the spacer 6 is arranged only on one side of the first flange portion 21 in the axial direction, and therefore the blade 5 can be prevented from coming into contact with the support leg 3. That is, in this embodiment, both the blade 5 and the support leg 3 can be prevented from coming into contact and the blade 5 can be prevented from protruding from the end face of the product.

[0050] 13 and 14 may become longer depending on the thickness of the spacer 6, which may result in the use of screws 7 that are less widely available, resulting in a decrease in the availability of the spacer 6. In this regard, in the present embodiment, two spacers 6 are prepared and one spacer 6 is disposed on each side of the first flange portion 21 in the axial direction, thereby making it possible to reduce the thickness of each spacer 6 and therefore to use screws 7 of a length that are more widely available.

[0051] In addition, when two spacers 6 are used, each spacer 6 may be configured as shown in FIG. 15. FIG. 15 is a view of the spacer 6 in a modification of the third embodiment, viewed along the axial direction. The shape of the spacer 6 when viewed along the axial direction is not particularly limited, but in this modification, it is annular. The inner and outer peripheral shapes of the spacer 6 when viewed along the axial direction are both circular. The spacer 6 has third screw holes 62 with different diameters formed alternately in the circumferential direction. The third screw holes 62 include a large hole 62a with a large diameter and a small hole 62b with a smaller diameter than the large hole 62a. The large hole 62a and the small hole 62b are formed in multiples. The large hole 62a and the small hole 62b are formed alternately and repeatedly in the circumferential direction. The large hole 62a and the small hole 62b are spaced apart from each other at equal angles in the circumferential direction. In this modification, four large holes 62a are formed at 90 degree intervals in the circumferential direction. In this modification, four small holes 62b are formed at 90 degree intervals in the circumferential direction. In this modification, the large hole 62a and the small hole 62b are offset by 45 degrees in the circumferential direction.

[0052] FIG. 16 is a view of the first spacer 6A and the motor 4 in the modified example of the third embodiment, viewed along the axial direction, and viewed from the air tunnel 11 side. FIG. 17 is a view of the second spacer 6B and the motor 4 in the modified example of the third embodiment, viewed along the axial direction, and viewed from the opposite side to the air tunnel 11. FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII shown in FIG. 16. In FIGS. 16 to 18, it is assumed that the spacer 6 having the configuration shown in FIG. 15 is used for the first spacer 6A and the second spacer 6B of the exhaust type ventilation fan 110B shown in FIG. 11. In FIG. 16, a part of the first spacer 6A is actually hidden by the second flange portion 42 of the motor 4, but the second flange portion 42 is omitted in order to make the entire first spacer 6A visible. In addition, in FIGS. 16 and 17, the motor holder 2 is omitted in the illustration.

[0053] The large hole 62a of the first spacer 6A shown in FIG. 16 and the large hole 62a of the second spacer 6B shown in FIG. 17 are offset in the circumferential direction. The large hole 62a of the first spacer 6A and the large hole 62a of the second spacer 6B are offset by 45 degrees in the circumferential direction in this modified example. The small hole 62b of the first spacer 6A shown in FIG. 16 and the small hole 62b of the second spacer 6B shown in FIG. 17 are offset in the circumferential direction. The small hole 62b of the first spacer 6A and the small hole 62b of the second spacer 6B are offset by 45 degrees in the circumferential direction in this modified example. The large hole 62a of the first spacer 6A shown in FIG. 16 and the small hole 62b of the second spacer 6B shown in FIG. 17 are aligned in the circumferential direction. The small hole 62b of the first spacer 6A shown in FIG. 16 and the large hole 62a of the second spacer 6B shown in FIG. 17 are aligned in the circumferential direction.

[0054] As shown in Fig. 18, the diameter of the large hole 62a is larger than the shaft diameter of the screw 7. Therefore, the screw 7 is not screwed into the large hole 62a. On the other hand, the screw 7 is screwed into the small hole 62b. The screw 7 screwed into the small hole 62b of the first spacer 6A is also screwed into the first screw hole 22 and the second screw hole 44, but is not screwed into the large hole 62a of the second spacer 6B. In addition, the screw 7 screwed into the small hole 62b of the second spacer 6B is also screwed into the first screw hole 22 and the second screw hole 44, but is not screwed into the large hole 62a of the first spacer 6A.

[0055] In this modification, as shown in Figs. 16 and 17, large holes 62a and small holes 62b are alternately and repeatedly formed in the circumferential direction in each of the first spacer 6A and the second spacer 6B. In addition, in this modification, the large holes 62a of the first spacer 6A and the small holes 62b of the second spacer 6B are aligned in the circumferential direction. In addition, in this modification, the small holes 62b of the first spacer 6A and the large holes 62a of the second spacer 6B are aligned in the circumferential direction. In addition, in this modification, the diameter of the large holes 62a is larger than the shaft diameter of the screws 7. With these configurations, as shown in Fig. 18, the screws 7 screwed into the small holes 62b of the first spacer 6A are not screwed into the large holes 62a of the second spacer 6B, so that interference between the screws 7 screwed into the first spacer 6A and the second spacer 6B can be avoided. On the other hand, since the screw 7 screwed into the small hole 62b of the second spacer 6B is not screwed into the large hole 62a of the first spacer 6A, it is possible to avoid interference between the screw 7 screwed from the second spacer 6B and the first spacer 6A. In other words, the large hole 62a has the function of preventing the screw 7 from being inserted from one of the first spacer 6A and the second spacer 6B to the other.

[0056] The number and intervals of the large holes 62a and the small holes 62b are not limited to the illustrated example and may be changed as appropriate. The shape of the spacer 6 when viewed along the axial direction is not limited to the illustrated example and may be changed as appropriate. For example, when eight third screw holes 62 are formed in the spacer 6 as shown in FIG. 15, the shape of the spacer 6 when viewed along the axial direction may be octagonal.

[0057] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or the embodiments may be combined with each other. Also, parts of the configurations may be omitted or modified without departing from the spirit of the invention. [Explanation of symbols]

[0058] 1 main body frame, 2 motor holding portion, 3 support leg, 4 motor, 5 blade, 6 spacer, 6A first spacer, 6B second spacer, 7 screw, 11 air tunnel portion, 12 fixing portion, 21 first flange portion, 22 first screw hole, 23 opening, 31 connection portion, 41 housing, 42 second flange portion, 43 shaft, 44 second screw hole, 45 mounting portion, 51 pressure surface, 52 negative pressure surface, 61 insertion hole, 62 third screw hole, 62a large hole, 62b small hole, 100, 100A, 100B ventilation fan, 110, 110A, 110B exhaust type ventilation fan, 120, 120A, 120B intake type ventilation fan.

Claims

1. A main body frame having a cylindrical air tunnel portion; a cylindrical motor holder disposed apart from the wind tunnel along an axial direction of the wind tunnel; a support leg extending from the main body frame toward the motor holding portion and supporting the motor holding portion; a motor at least a portion of which is disposed inside the motor holding portion and fixed to the motor holding portion; a blade attached to the motor and rotating with the rotation of the motor to generate an air flow; Equipped with a first flange portion having an annular shape and extending radially inwardly of the air tunnel portion is formed on an inner circumferential surface of the motor holding portion; the motor has a housing inserted into an opening formed by being surrounded by the first flange portion, and a second flange portion extending radially outward from an outer circumferential surface of the housing and fixed to the first flange portion, the second flange portion is disposed on one side of the first flange portion in the axial direction, A ventilation fan characterized in that it is configured to be able to select whether to place a spacer having a thickness in the axial direction between the first flange portion and the second flange portion, or to not place the spacer between the first flange portion and the second flange portion.

2. The motor is capable of rotating in both forward and reverse directions, When the motor rotates in the forward direction, an air flow is generated from the motor holder toward the air tunnel. When the motor rotates in the reverse direction, an air flow is generated from the air channel toward the motor holder. The vane has a pressure surface facing a downstream side of the airflow and a suction surface facing an upstream side of the airflow, 2. The ventilation fan according to claim 1, characterized in that, when the motor is rotated in a forward direction, the blades are attached to the motor so that the negative pressure surface of the blade faces toward the motor holding portion, the second flange portion is disposed between the first flange portion and the air tunnel portion, and the spacer is not disposed between the first flange portion and the second flange portion.

3. 3. The ventilation fan according to claim 2, characterized in that, when the motor is rotated in reverse, the blades are attached to the motor so that the pressure surface of the blade faces toward the motor holding portion, the second flange portion is positioned on the opposite side of the first flange portion from the air tunnel portion, and the spacer is positioned between the first flange portion and the second flange portion.

4. The motor is capable of rotating in both forward and reverse directions, When the motor rotates in the forward direction, an air flow is generated from the motor holder toward the air tunnel. When the motor rotates in the reverse direction, an air flow is generated from the air channel toward the motor holder. The vane has a pressure surface facing a downstream side of the airflow and a suction surface facing an upstream side of the airflow, 2. The ventilation fan according to claim 1, wherein when the motor is rotated in a forward direction, the blades are attached to the motor so that the negative pressure surface of the blade faces toward the motor holding portion, the second flange portion is disposed between the first flange portion and the air tunnel portion, and the spacer is disposed between the first flange portion and the second flange portion.

5. 5. The ventilation fan according to claim 4, characterized in that, when the motor is rotated in reverse, the blades are attached to the motor so that the pressure surface of the blade faces toward the motor holding portion, the second flange portion is positioned on the opposite side of the first flange portion from the air tunnel portion, and the spacer is not positioned between the first flange portion and the second flange portion.

6. The number of the spacers is two, The motor is capable of rotating in both forward and reverse directions, When the motor rotates in the forward direction, an air flow is generated from the motor holder toward the air tunnel. When the motor rotates in the reverse direction, an air flow is generated from the air channel toward the motor holder. The vane has a pressure surface facing a downstream side of the airflow and a suction surface facing an upstream side of the airflow, 2. The ventilation fan according to claim 1, wherein, when the motor is rotated in a forward direction, the blades are attached to the motor so that the negative pressure surface of the blade faces toward the motor holding portion, the second flange portion is disposed between the first flange portion and the air tunnel portion, one of the spacers is disposed between the first flange portion and the second flange portion, and the other spacer is not disposed between the first flange portion and the second flange portion.

7. 7. The ventilation fan of claim 6, wherein, when the motor is rotated in reverse, the blades are attached to the motor so that the pressure surface of the blade faces toward the motor holding portion, the second flange portion is positioned on the opposite side of the first flange portion from the air tunnel portion, one of the spacers is not positioned between the first flange portion and the second flange portion, and the other spacer is positioned between the first flange portion and the second flange portion.

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