Ventilation fan

Abstract

To provide a ventilation fan capable of suppressing a temperature rise of an electric motor with a simple structure.SOLUTION: A ventilation fan comprises: a body frame 1 having a wind tunnel part 2; a support leg 4 attached to the body frame 1; an electric motor 3 supported by the support leg 4; an impeller 5 attached to a shaft of the electric motor 3 and rotating when driven by the electric motor 3 to generate an air flow; a heat transfer part that transfers heat generated by the electric motor 3 toward the body frame 1; and a radiator 10 that is attached to the support leg 4 so as to sandwich the heat transfer part, and radiates the heat from the heat transfer part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation fan. [Background Art]

[0002] A ventilation fan that is installed on a wall surface of a building and ventilates the room by exhausting indoor air to the outdoors or supplying outdoor air into the room is known. This type of ventilation fan includes a main body frame having a cylindrical air duct section, a plurality of support legs fixed to the main body frame, an electric motor supported by the plurality of support legs, and an impeller fastened to a shaft of the electric motor.

[0003] Ventilation fans for industrial use are used by driving the impeller to rotate at a high rotational speed via the electric motor to obtain a large airflow. For this reason, the amount of heat generated by the electric motor increases, and the temperature of the electric motor rises significantly. Conventionally, in order to suppress the temperature rise of the electric motor, countermeasures have been taken by changing the structure of the electric motor or the specifications of the windings.

[0004] However, these countermeasures have limitations in heat dissipation effect, and may lead to reduced output or increased size of the electric motor in order to reduce the load on the electric motor.

[0005] Patent Document 1 discloses a ventilation fan that can suppress temperature rise of the electric motor by fixedly attaching heat radiation fins, which are heat radiation components, to motor support legs that support the electric motor with screws. [Prior Art Literature] [Patent Literature]

[0006] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2019-117025 [Summary of the Invention] [Problem to be Solved by the Invention]

[0007] However, the ventilation fan disclosed in Patent Document 1 has heat dissipation fins directly attached to the motor support legs, so the heat dissipation effect largely depends on the contact thermal resistance between the heat dissipation fins and the motor support legs and the thermal conductivity of the motor support legs themselves, and the overall thermal resistance from the motor to the heat dissipation fins is large. As a result, there was a problem that sufficient heat dissipation effect could not be obtained and the temperature rise of the motor could not be sufficiently suppressed.

[0008] This disclosure is made to solve the above-mentioned problems and aims to provide a ventilation fan that can suppress the temperature rise of an electric motor with a simple structure. [Means for solving the problem]

[0009] The ventilation fan disclosed herein comprises a main frame having a wind tunnel section, support legs attached to the main frame, an electric motor supported by the support legs, an impeller mounted on the shaft of the electric motor which rotates by the drive of the electric motor to generate airflow, and a component with a higher thermal conductivity than the support legs that transfers the heat emitted from the electric motor towards the main frame. Heat pipe and , Heat pipe It is attached to the support leg by sandwiching it between the legs. The heat pipe has a heat sink plate that sandwiches the heat pipe and a heat sink fin consisting of a plurality of fins attached to the heat sink plate, It is equipped with a heat sink that releases heat. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a ventilation fan that can suppress the temperature rise of an electric motor with a simple structure. [Brief explanation of the drawing]

[0011] [Figure 1] This is a top view of the ventilation fan according to the embodiment. [Figure 2] This is an enlarged view of the main part of Figure 1. [Figure 3] This diagram illustrates the shape of the heat pipe used in the ventilation fan according to the embodiment. [Figure 4] This diagram illustrates the configuration of a heat exchanger used in the ventilation fan according to the embodiment. [Figure 5]This diagram illustrates the configuration of the motor support legs used in the ventilation fan according to the embodiment. [Figure 6] This diagram illustrates the configuration of the motor mounting plate used in the ventilation fan according to the embodiment. [Figure 7] This diagram illustrates the configuration of the motor support legs, heat pipe, and motor mounting plate used in the ventilation fan of this embodiment. [Figure 8] This figure shows the motor support legs used in the ventilation fan of the embodiment with the heat pipe and heat sink attached. [Figure 9] This diagram illustrates the configuration of the motor casing used in the ventilation fan according to the embodiment. [Modes for carrying out the invention]

[0012] The embodiments for carrying out the subject matter of this disclosure will be described with reference to the attached drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are simplified or omitted as appropriate. However, the subject matter of this disclosure is not limited to the following embodiments, and any modification of any component of the embodiments or omission of any component of the embodiments is possible without departing from the spirit of this disclosure.

[0013] Embodiment Figure 1 is a top view of the ventilation fan according to the embodiment, and is a view of the ventilation fan from the rear side. Figure 2 is an enlarged view of the main part of Figure 1. The ventilation fan 100 is installed on the wall of a building with a small space, such as a house or shop, or on the wall of a building with a large space, such as a factory or warehouse, and ventilates the room by exhausting indoor air to the outside or supplying outside air to the room. The ventilation fan 100 is a pressurized ventilation fan and can also be used for industrial purposes. In the following explanation, the side from which the airflow is blown out will be referred to as the front, and the opposite side as the back.

[0014] A ventilation fan 100 includes a main body frame 1, an electric motor 3, an impeller 5, electric motor support legs 4, a heat pipe 9, and a heat radiator 10.

[0015] As shown in Fig. 1, the ventilation fan 100 has four electric motor support legs 4. The four electric motor support legs 4 have the same configuration, and as described later, the configurations of various members attached to the four electric motor support legs 4 are also the same, except that one electric motor support leg 4 is provided with a power cable 11. Therefore, in the following description, one electric motor support leg 4 and various members attached to the electric motor support leg 4 will be described. Note that hereinafter, "electric motor support leg 4" may be described as "support leg 4".

[0016] The main body frame 1 has a rectangular outer diameter and includes an air tunnel portion 2 serving as a ventilation path in the center. The electric motor 3 is arranged such that the shaft of the electric motor 3 coincides with the center position of the air tunnel portion 2. The impeller 5 is connected to the shaft of the electric motor 3. The impeller 5 rotates in the air tunnel portion 2 as the rotating shaft is driven by the electric motor 3, and generates an airflow passing through the air tunnel portion 2. Note that in the following description, the main body frame 1 side may be described as the outer peripheral side of the ventilation fan 100.

[0017] The electric motor 3 includes an electric motor main body and an electric motor outer shell portion 12 surrounding the outside of the electric motor main body. The electric motor support legs 4 connect the electric motor outer shell portion 12 and the four corners of the main body frame 1 to support the electric motor 3. Each of the four electric motor support legs 4 is fixed to the main body frame 1 via a main body frame mounting plate 7 attached to the end portion on the main body frame 1 side, and is fixed to the electric motor outer shell portion 12 with a screw 8 via an electric motor mounting plate 6 attached to the end portion on the electric motor 3 side. Each of the four electric motor support legs 4 is bent to support the electric motor 3 and connect it to the main body frame 1. A steel material is used as the material of the electric motor support legs 4, but any material other than a steel plate with low thermal conductivity such as synthetic resin may be used as long as it has sufficient rigidity to support the electric motor 3.

[0018] The ventilation fan 100 also includes a power cable 11 that supplies power to the motor 3. The power cable 11 is routed along one of the four motor support legs 4 and connected to the commercial power supply. The power cable 11 is wired between the heat sinks 10 and secured to the motor support legs 4 with any number of cable ties. The power cable 11 may also be routed along multiple motor support legs 4.

[0019] Figure 2 is an enlarged view of the main part of Figure 1. As shown in Figure 2, in a top view, the ventilation fan 100 of the embodiment has a heat pipe 9 and a heat sink 10 equipped with a heat sink plate 10a and heat sink fins 10b fixed to both sides of the motor support leg 4 by screws 18. The heat pipe 9 moves the heat emitted from the motor 3 toward the main frame 1. The heat sink 10 is attached to the motor support leg 4, sandwiching the heat pipe 9, and releases the heat from the heat pipe 9. Note that in Figure 2, as will be described later with reference to Figure 9(b), the heat pipe 9 This diagram schematically shows how the motor is inserted into the insertion hole 6b provided in the motor mounting plate 6 and the insertion hole 12c2 provided in the motor mounting plate fastening portion 12c of the motor outer casing 12.

[0020] Figure 3 illustrates the shape of the heat pipe used in the ventilation fan of this embodiment. Figure 3(a) is a side view of the heat pipe, and Figure 3(b) is a front view of the heat pipe. In Figure 2, the view in the direction of arrow A (i.e., parallel to the longitudinal direction of the motor support leg 4) is considered a side view, and the view in the direction of arrow B (i.e., perpendicular to the longitudinal direction of the motor support leg 4) is considered a front view. The same applies to the following explanation. The heat pipe 9 has a rectangular cross-section and a linear shape. The heat pipe 9 is filled with working fluid. When the temperature of the heat pipe 9 rises, the working fluid in the high-temperature section evaporates and absorbs heat, and the evaporated working fluid moves to the low-temperature section. The working fluid that moves to the low-temperature section releases heat and returns to a liquid state. In this way, the heat pipe 9 functions as a heat transfer component that moves heat from a high-temperature section to a low-temperature section.

[0021] Figure 4 illustrates the configuration of the motor support legs used in the ventilation fan of this embodiment. Figure 4(a) is a side view of the motor support legs, and Figure 4(b) is a front view of the motor support legs. The motor support leg 4 has a bent portion 4a, and a rectangular groove 4b is formed on the side facing the motor 3 from the bent portion 4a, which is shorter than the total length of the heat pipe. The cross-sectional area of ​​this groove 4b is 10% to 30% of the cross-sectional area of ​​the motor support leg 4. In other words, the cross-sectional area of ​​the motor support leg 4 where the groove 4b is present is 10 to 30% smaller than the cross-sectional area of ​​the motor support leg 4 where the groove 4b is absent. The motor support leg 4 also has a screw hole 4c for passing a screw 18 through which the heat pipe 9 is sandwiched and the heat sink 10a is attached.

[0022] Figure 5 illustrates the configuration of a heat sink used in the ventilation fan of this embodiment, where Figure 5(a) is a side view of the heat sink and Figure 5(b) is a top view of the heat sink. The heat sink 10 comprises a heat sink plate 10a and heat sink fins 10b. The heat sink plate 10a has screw holes 10a1, and screws 18 are inserted into these screw holes 10a1 to sandwich the heat pipe 9 and fix it to the motor support leg 4. The heat sink plate 10a has a surface parallel to the longitudinal direction of the motor support leg, and this surface becomes the heat sink surface, releasing heat from the heat pipe 9. The heat sink fins 10b consist of a plurality of fins joined to the heat sink plate 10a. As shown in Figure 5(b), each of the plurality of fins is at the same height from the surface of the heat sink plate 10a. As shown in Figure 5(a), each of the multiple fins is inclined toward the outer periphery (i.e., toward the main frame 1) with respect to the direction perpendicular to the longitudinal direction of the motor support leg 4 when viewed from the front. In other words, each of the multiple fins is inclined so that the airflow from above entering between the multiple fins approaches the shaft of the motor 3 after passing between the multiple fins. Furthermore, the size of the fins (i.e., the surface area) is formed to increase as it moves away from the motor 3 (i.e., as it moves toward the outer periphery). In other words, the surface area of ​​the multiple fins is formed to be larger at positions far from the motor 3 than at positions close to the motor 3. Specifically, the average surface area of ​​the multiple fins at positions far from the motor 3 is larger than the average surface area of ​​the multiple fins at positions close to the motor 3. The surface of the heat dissipation fin 10b becomes a heat dissipation surface and releases heat from the heat pipe 9.

[0023] Figure 6 illustrates the configuration of a motor mounting plate used in the ventilation fan of this embodiment. Figure 6(a) is a side view of the motor mounting plate, and Figure 6(b) is a front view of the motor mounting plate. The motor mounting plate 6 has screw holes 6a for attaching the motor mounting plate 6 to the motor outer casing 12 using screws 8, and insertion holes 6b for passing the heat pipe 9 through.

[0024] Figure 7 illustrates the configuration of the motor support leg, heat pipe, and motor mounting plate used in the ventilation fan of this embodiment. Figure 7(a) is a side view of the motor support leg, Figure 7(b) is a side view showing the state in which the heat pipe is attached to the motor support leg, Figure 7(c) is a front view showing the state in which the heat pipe is attached to the motor support leg, and Figure 7(d) is a side view showing the state in which the motor mounting plate is attached to the motor support leg to which the heat pipe is attached. The end of the heat pipe 9 on the motor 3 side protrudes from the end of the motor support leg 4 on the motor 3 side and passes through the motor mounting plate 6.

[0025] Figure 8 shows a state in which a heat pipe and radiator are attached to the motor support leg used in the ventilation fan of the embodiment. Figure 8(a) is a side view showing the state in which the heat pipe and radiator are attached to the motor support leg, and Figure 8(b) is a front view showing the state in which the heat pipe and radiator are attached to the motor support leg. In a side view, the radiator 10, which was explained using Figure 5, is fixed to both sides of the motor support leg 4 by screws 18, sandwiching the heat pipe 9, which was explained using Figure 3. The tip of the heat pipe 9 on the motor 3 side passes through the motor mounting plate 6. The motor mounting plate 6 is attached to the end of the motor support leg 4 on the motor 3 side by welding. In addition, the main frame mounting plate 7 is attached to the end of the motor support leg 4 on the main frame 1 side by welding. The main frame mounting plate 7 is fixed to the main frame 1 by mounting parts.

[0026] The airflow generated by the rotation of the impeller 5 travels from the back to the front of the ventilation fan. The direction of the airflow 13a before it enters the heat dissipation fins is approximately parallel to the shaft of the motor 3. Since the multiple fins of the heat dissipation fins 10b are inclined with respect to the direction of the airflow 13a entering the heat dissipation fins 10b, the direction of the airflow 13a changes when it enters the heat dissipation fins 10b. The airflow 13b that has passed through the heat dissipation fins 10b travels parallel to the heat dissipation surface of the heat dissipation fins 10b towards the shaft of the motor 3. This increases the airflow in the vicinity of the motor 3. This also simultaneously enhances the heat dissipation effect of the heat dissipation fins 12b provided on the motor outer shell 12, which will be described later.

[0027] Figure 9 is a diagram illustrating the configuration of the motor housing used in the ventilation fan of this embodiment. Figure 9(a) is a top view of the motor housing, and Figure 9(b) is an enlarged view of the main part C of Figure 9(a), illustrating the attachment of the motor mounting plate to the motor housing. As shown in Figure 9(a), the motor housing 12 comprises a motor housing body 12a that surrounds the outside of the motor body, heat dissipation fins 12b, and motor mounting plate fastening parts 12c. The heat dissipation fins 12b are provided on the outer circumference of the motor housing body 12a and consist of a plurality of fins extending radially from the center of the motor housing body 12a. The heat dissipation fins 12b release heat from the motor 3. The motor mounting plate fastening parts 12c are provided on the outer circumference of the motor housing body 12a and four are provided at positions corresponding to the four motor support legs 4.

[0028] As shown in Figure 9(b), the motor mounting plate fastening portion 12c has a screw hole 12c1 connected to a screw hole 6a provided in the motor mounting plate 6, and an insertion hole 12c2 connected to an insertion hole 6b provided in the motor mounting plate 6. The motor mounting plate 6 is fixed to the motor outer casing 12 by screws 8 (see Figure 1) using the screw holes 6a and 12c1. The heat pipe 9 is inserted into the insertion holes 6b and 12c2, and the inserted heat pipe 9 is sealed and fixed to the motor outer casing 12.

[0029] Next, we will explain the release of heat generated by operating the electric motor 3. When the electric motor 3 is operated, the impeller 5 connected to the shaft of the electric motor 3 is driven to rotate, causing the electric motor 3 to generate heat. When the electric motor 3 generates heat, the portion of the heat pipe 9 inserted into the insertion hole 12c2 of the electric motor mounting plate fastening portion 12c is heated. The working fluid absorbs heat and evaporates on the inner wall of the high-temperature portion of this heated heat pipe 9. The evaporated working fluid moves away from the electric motor 3 (i.e., towards the main frame 1). As a result, the heat from the electric motor 3 moves from the high-temperature portion on the electric motor 3 side to the low-temperature portion on the main frame 1 side. The working fluid that moves to the low-temperature portion releases heat and returns to a liquid state. This transferred heat is released from the heat dissipation surface of the heat sink 10a, which is in surface contact with the heat pipe 9, and from the heat dissipation surface of the heat dissipation fins 10b joined to the heat sink 10a.

[0030] According to the ventilation fan 100 of this embodiment, it includes a heat transfer component that moves the heat emitted from the electric motor 3 toward the main frame 1, and a heat sink 10 that is attached to the support legs 4, sandwiching the heat transfer component, and releasing the heat from the heat transfer component. As a result, the Joule heat, which is the main heat-generating element of the electric motor 3, is moved by the heat transfer component, which has high thermal conductivity, toward the outer periphery of the ventilation fan where the airflow volume is high, and released by the heat sink 10. In this way, the ventilation fan 100 of this embodiment can suppress the temperature rise of the electric motor of the ventilation fan with a simple structure.

[0031] Furthermore, according to the ventilation fan 100 of this embodiment, the heat transfer component is a heat pipe 9, and the heat sink 10 includes a heat sink plate 10a that sandwiches the heat pipe 9, and a heat sink fin 10b consisting of a plurality of fins attached to the heat sink plate 10a. As a result, the heat sink fin 10b, which has a large heat dissipation surface, can efficiently release the heat from the heat pipe 9, thereby suppressing the temperature rise of the electric motor 3. This makes it possible to improve the output of the electric motor 3. Although the provision of the heat sink fin 10b causes pressure loss and reduces the airflow, the improved output of the electric motor 3 compensates for the reduction in airflow, or the ventilation fan can be provided with airflow performance that exceeds the reduction in airflow.

[0032] Furthermore, according to the ventilation fan 100 of this embodiment, the surface area of ​​the multiple fins is configured to be larger at positions further from the motor than at positions closer to the motor. This enhances the condensation effect of the vapor in the working fluid on the outer circumference of the ventilation fan where the airflow volume is high, thereby increasing the circulation efficiency of the working fluid within the heat pipe 9 and further enhancing the heat dissipation effect.

[0033] Furthermore, according to the ventilation fan 100 of this embodiment, at least some of the multiple fins are arranged so that the airflow passing through the multiple fins is directed toward the shaft, thereby increasing the airflow near the electric motor 3. This further enhances the heat dissipation effect of the electric motor 3.

[0034] Furthermore, according to the ventilation fan 100 of this embodiment, at least some of the multiple fins are attached to the heat sink 10a non-parallel to the shaft, which increases the airflow near the electric motor 3. This further enhances the heat dissipation effect of the electric motor 3.

[0035] Furthermore, according to the ventilation fan 100 of this embodiment, the electric motor 3 has an electric motor body and an electric motor outer casing 12 that surrounds the outside of the electric motor body. The end of the heat pipe 9 on the electric motor 3 side protrudes from the end of the support leg 4 on the electric motor 3 side and is located inside the electric motor outer casing 12. This allows the end of the heat pipe 9 on the electric motor 3 side to be brought closer to the coil, which is the main heat source of the electric motor 3. This further enhances the heat dissipation effect of the electric motor 3. In particular, the heat dissipation effect is high for AC motors used in general ventilation fans.

[0036] Furthermore, according to the ventilation fan 100 of this embodiment, since the outer circumference of the motor housing 12 is provided with heat dissipation fins 12b consisting of multiple fins, the heat dissipation effect of the motor 3 by the airflow 13b directed toward the shaft of the motor 3 can be further enhanced.

[0037] In the embodiment described above, an example was given in which screws 18 were used to attach the heat pipe 9 and the heat sink 10 to the support leg 4. However, they may be attached by methods other than using screws 18. For example, through holes may be provided in the support leg 4, and the heat pipe 9 and heat sink 10 may be attached from both sides of the support leg 4 using bolts and nuts. Alternatively, the heat pipe 9 may be sandwiched between the support leg 4 and the heat sink 10 may be attached by joining using welding or other methods.

[0038] Furthermore, in the embodiment described above, the heat sink 10 is attached to all four support legs 4 with the heat pipe 9 sandwiched in between, but it is sufficient if the heat sink 10 is attached to at least one support leg 4 with the heat pipe 9 sandwiched in between. Also, although the heat sink 10 is attached to both sides of the support leg 4 with the heat pipe 9 sandwiched in between, it is also acceptable to attach the heat sink 10 to only one side of the support leg 4 with the heat pipe 9 sandwiched in between. However, the more heat sinks 10 that are attached (i.e., the larger the surface area of ​​the heat dissipation), the greater the heat dissipation effect and the greater the effect of suppressing the temperature rise of the motor of the ventilation fan.

[0039] Furthermore, in the embodiment described above, the multiple fins of the heat dissipation fin 10b are all mounted at the same angle of inclination relative to the heat sink 10a, but some fins may be mounted at a different angle of inclination from the other fins. Also, although each of the heat dissipation surfaces of the multiple fins of the heat dissipation fin 10b is an inclined plane, it is sufficient if the shape is such that the airflow passing through the multiple fins is directed toward the shaft. For example, each of the heat dissipation surfaces of the multiple fins may have a curved surface, and may have multiple planes that bend so that the airflow entering the multiple fins is directed toward the shaft midway.

[0040] Furthermore, although the above-described embodiment mentions the use of a heat pipe 9 as the heat transfer component, it is not necessarily limited to a heat pipe 9. Any component that has a higher thermal conductivity than the support legs 4 and has the function of efficiently transferring heat from a high-temperature part to a low-temperature part is acceptable. For example, a vapor chamber or a Peltier element may be used as the heat transfer component.

[0041] Examples of aspects that may be included in this disclosure are listed below as an addendum. (Note 1) A main frame having a wind tunnel section, Support legs attached to the main frame, The electric motor is supported by the aforementioned support legs, An impeller mounted on the shaft of the electric motor, which rotates in response to the drive of the electric motor to generate an airflow, A heat transfer component that moves the heat generated from the electric motor toward the main frame, A heat sink is attached to the support leg, sandwiching the heat transfer component, and is used to release heat from the heat transfer component. A ventilation fan equipped with a ventilation fan. (Note 2) The heat transfer component is a heat pipe, and the heat sink comprises a heat sink plate that sandwiches the heat pipe and a heat sink fin consisting of a plurality of fins attached to the heat sink plate. The ventilation fan described in Appendix 1. (Note 3) The surface area of ​​the plurality of fins is larger at positions further from the motor than at positions closer to the motor. The ventilation fan described in Appendix 2. (Note 4) At least some of the plurality of fins are arranged such that the airflow passing through the plurality of fins is directed toward the shaft. The ventilation fan described in Appendix 2 or Appendix 3. (Note 5) At least some of the plurality of fins are attached to the heat sink non-parallel to the shaft. A ventilation fan as described in any one of the items in Appendix 2 to Appendix 4. (Note 6) The electric motor comprises an electric motor body and an electric motor casing that surrounds the outside of the electric motor body, and the end of the heat pipe on the electric motor side protrudes from the end of the support leg on the electric motor side and is located inside the electric motor casing. A ventilation fan as described in any one of the items in Appendix 2 to Appendix 5. (Note 7) The outer periphery of the electric motor is provided with heat dissipation fins consisting of a plurality of fins. The ventilation fan described in Appendix 6. [Explanation of Symbols]

[0042] 1 Main frame, 2 Wind tunnel section, 3 Electric motor, 4 Electric motor support legs (support legs), 4a Bent section, 4b Groove, 4c Screw hole, 5 Impeller, 6 Mounting plate for electric motor, 6a Screw hole, 6b Insertion hole, 7 Mounting plate for main frame, 8 Screw, 9 Heat pipe, 10 Heat sink, 10a Heat sink plate, 10a1 Screw hole, 10b Heat sink fins, 11 Power cable, 12 Electric motor outer casing, 12a Electric motor outer casing body, 12b Heat sink fins, 12c Mounting plate fastening section for electric motor, 12c1 Screw hole, 12c2 Insertion hole, 13a, 13b Airflow, 18 Screw, 100 Ventilation fan.

Claims

1. A main frame having a wind tunnel section, Support legs attached to the main frame, The electric motor is supported by the aforementioned support legs, An impeller mounted on the shaft of the electric motor, which rotates in response to the drive of the electric motor to generate an airflow, A heat pipe with a higher thermal conductivity than the support leg is used to transfer the heat generated from the electric motor toward the main frame, A heat sink is attached to the support legs, sandwiching the heat pipe, and having a heat sink plate that sandwiches the heat pipe and a heat sink fin consisting of a plurality of fins attached to the heat sink plate, for releasing heat from the heat pipe, A ventilation fan equipped with a ventilation fan.

2. The surface area of ​​the plurality of fins is larger at positions further from the motor than at positions closer to the motor. The ventilation fan according to claim 1.

3. At least some of the plurality of fins are arranged such that the airflow passing through the plurality of fins is directed toward the shaft. The ventilation fan according to claim 1.

4. At least some of the plurality of fins are attached to the heat sink non-parallel to the shaft. The ventilation fan according to claim 1.

5. The electric motor comprises an electric motor body and an electric motor casing that surrounds the outside of the electric motor body, and the end of the heat pipe on the electric motor side protrudes from the end of the support leg on the electric motor side and is located inside the electric motor casing. A ventilation fan according to any one of claims 1 to 4.

6. The outer periphery of the electric motor is provided with heat dissipation fins consisting of multiple fins. The ventilation fan according to claim 5.

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