Centrifugal exhaust fan shell and exhaust fan

Abstract

The centrifugal exhaust fan shell comprises a volute, the volute is provided with a containing cavity, the front face of the containing cavity is provided with an opening, the containing cavity is divided into an air guide chamber and an electrical chamber through a partition, the air guide chamber is provided with a connecting piece used for installing a wind wheel, and the electrical chamber is provided with an air inlet and an air outlet. An exhaust port communicated with the air guide chamber is formed in one side surface of the volute; the partition is provided with a wire slot, the wire slot is located on an air outlet path of the wind wheel, the air guide chamber is communicated with the electrical chamber through the wire slot, a heat dissipation film is arranged in the electrical chamber and divides the electrical chamber into an airflow area and a non-airflow area, and the non-airflow area is used for installing a circuit board; and the cover plate covers the opening, and the cover plate is provided with an air inlet communicating with the air guide chamber and a convection opening communicating with the electrical chamber. Compared with the prior art, the circuit board of the exhaust fan is far away from a humid working environment, heat dissipation can be carried out on the circuit board, and the service life of the circuit board is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ventilation equipment, especially centrifugal exhaust fan shell and exhaust fan. BACKGROUND

[0002] Ceiling in the field of home decoration is more and more popular, and the indoor air quality can be effectively improved by installing exhaust fan on the ceiling, especially for the washroom, the exhaust fan can not only exhaust indoor air to the outside to achieve the effect of deodorization, but also can take away the indoor humidity to realize the function of dehumidification.

[0003] The wind wheel of the existing centrifugal exhaust fan faces downward, and the circuit board driving the wind wheel is generally arranged in the terminal box at the top of the shell and is arranged separately from the wind wheel to prevent the wind wheel from blowing humid air to the terminal box, thereby causing the circuit board to be short-circuited due to dampness. However, it is found in practice that after the exhaust fan is stopped and the indoor air is stable, water molecules in the air will condense when they meet the exhaust fan, and a large amount of water droplets will accumulate at the top of the shell. Even if the terminal box is sealed, it is still in a humid environment for a long time and is very easy to be damaged by dampness.

[0004] On the other hand, since the terminal box is sealed, the heat generated by the electrical elements inside the terminal box is difficult to exchange with the outside, which also easily leads to overheating damage. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a centrifugal exhaust fan shell to solve the technical problems existing in the prior art.

[0006] The centrifugal exhaust fan shell according to the first aspect of the utility model comprises:

[0007] A volute shell having a receiving cavity, the front surface of the receiving cavity is provided with an open mouth, the receiving cavity is divided into an air guide chamber and an electrical chamber by a partition, the air guide chamber is provided with a connecting piece for mounting a wind wheel, one side surface of the volute shell is provided with an exhaust port communicated with the air guide chamber; the partition is provided with a wire slot, the wire slot is located on the air outlet path of the wind wheel, the air guide chamber and the electrical chamber are communicated through the wire slot, a heat dissipation film is arranged in the electrical chamber, the heat dissipation film divides the electrical chamber into an air flow area and a non-air flow area, the non-air flow area is used for mounting a circuit board, and the side surface of the volute shell is provided with a wire hole communicated with the non-air flow area.

[0008] A cover plate covers the open mouth, the cover plate is provided with an air inlet communicated with the air guide chamber and a convection port communicated with the electrical chamber.

[0009] According to the centrifugal exhaust fan shell, the electrical chamber is arranged in the volute and is independent of the air guide chamber, so that condensed water droplets cannot drop into the electrical chamber, thereby ensuring safe use of the circuit board; when the fan wheel rotates, part of air enters the electrical chamber from the wire slot, the electrical chamber is divided into an air flow area and a non-air flow area by the heat dissipation film, the non-air flow area is used for mounting the circuit board, so that the air flow area drives the heat dissipation film to be attached to the circuit board when the air passes through the air flow area, heat generated by the circuit board is transmitted to the heat dissipation film and exchanges heat with air in the air flow area, which not only dissipates heat of the circuit board, but also prevents the circuit board from being directly contacted with the air to prevent the circuit board from being damaged due to dampness; finally, the air flowing through the air flow area flows out from the convection port of the cover plate and reenters the air guide chamber under the pumping action of the fan wheel, so that air flow circulation is formed; compared with the prior art, the electrical chamber is arranged to be far away from a damp working environment of the exhaust fan, and the circuit board can be dissipated, thereby effectively prolonging the service life of the circuit board.

[0010] According to some embodiments of the utility model, the electrical chamber is located at the side of the exhaust port, and the wire slot is downstream of the fan wheel rotation direction relative to the exhaust port. Through the above-mentioned setting, the shunt effect of the electrical chamber on the air flow can be reduced, so that only a small part of air enters the electrical chamber after being concentrated and discharged to the exhaust port.

[0011] According to some embodiments of the utility model, in order to increase the air flow entering the electrical chamber, the wire slot extends from the bottom surface of the accommodating cavity to the direction of the opening, so as to expand the size of the wire slot.

[0012] According to some embodiments of the utility model, the heat dissipation film is attached to the electrical chamber, and the actual size of the heat dissipation film is greater than the planar size covered by the heat dissipation film. Since the actual size of the heat dissipation film is greater than the planar size covered by the heat dissipation film, the heat dissipation film is in a relaxed state at idle time, and once air enters the air flow area, the heat dissipation film will be attached to the circuit board under the action of air pressure.

[0013] According to some embodiments of the utility model, specifically, the heat dissipation film is a metal heat dissipation film, and the metal heat dissipation film is provided with an insulating layer on the side facing the non-air flow area, so as to prevent short circuit.

[0014] According to some embodiments of the utility model, the electrical chamber is provided with a mounting rack, the mounting rack is used for fixing the position of the circuit board, and the mounting rack is provided with a wire inlet port communicated with the wire slot. In order to better attach the heat dissipation film to the circuit board, the circuit board is preferably placed in an inclined manner, and the mounting rack can meet this condition.

[0015] According to some embodiments of the present application, specifically, the number of the convection ports is multiple, and the convection ports are arranged near the circuit board.

[0016] According to some embodiments of the present application, the total flow area of the convection ports is less than the flow area of the wire slot, so that the air flow is pressurized in the electrical chamber, which is beneficial to the heat dissipation film to be closely attached to the circuit board.

[0017] According to some embodiments of the present application, since the power line of the circuit board needs to be electrically connected with the commercial power through the wire hole, in order to avoid the water droplets from the wire hole to the non-airflow area of the electrical chamber, the wire hole is connected with a globe valve.

[0018] According to the second aspect of the present application, the exhaust fan comprises:

[0019] The centrifugal exhaust fan shell described above, the volute is provided with a mounting position communicated with the opening, and the size of the mounting position is greater than the size of the opening;

[0020] A wind wheel is mounted to the connecting member of the air guide chamber, and the wind wheel has an air flow direction from the air inlet to the air outlet during operation;

[0021] A circuit board is mounted in the non-airflow area of the electrical chamber, and the circuit board is electrically connected with the wind wheel;

[0022] A grid plate is covered on the mounting position.

[0023] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a perspective structural schematic view of the centrifugal exhaust fan shell provided by the embodiments of the present application;

[0026] Figure 2 is Figure 1 is a perspective exploded view of the centrifugal exhaust fan shell shown in the figure;

[0027] Figure 3 is a top view of the centrifugal exhaust fan shell provided by the embodiments of the present application after the cover plate is hidden;

[0028] Figure 4 is Figure 3A cross-sectional view of the centrifugal exhaust fan housing shown along the A-A section line.

[0029] In the drawings: 100 - volute, 200 - cover plate, 110 - accommodating cavity, 120 - opening, 130 - exhaust port, 300 - circuit board, 140 - partition, 150 - air guide chamber, 160 - electrical chamber, 151 - connecting piece, 141 - wire slot, 400 - heat dissipation film, 161 - air flow area, 162 - non-air flow area, 500 - mounting frame, 510 - wire inlet, 410 - insulation layer, 163 - wire hole, 210 - air inlet, 220 - convection port, 170 - mounting position. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it should be understood that, if the orientation description, such as up, down, front, back, left, right and the like, is described, the orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0034] As Figure 1 and Figure 2As shown, the centrifugal exhaust fan shell according to the first aspect embodiment of the utility model, it includes volute 100 and cover plate 200, volute 100 and cover plate 200 can be selected as plastic component, both are integrated structure. Wherein, volute 100 has accommodating cavity 110, accommodating cavity 110 has certain depth and closed bottom surface, the front surface of accommodating cavity 110 is equipped with open mouth 120. Accommodating cavity 110 is used to install wind wheel, wind wheel carries out high-speed rotation in accommodating cavity 110, one side of volute 100 is equipped with exhaust port 130 that is communicated with accommodating cavity 110, and exhaust port 130 is arranged in right angles with open mouth 120. If exhaust fan is installed on the ceiling, then the open mouth 120 of volute 100 needs to be towards the floor of indoor, at this time, exhaust port 130 is arranged along horizontal direction, wind wheel inhales air from indoor space through open mouth 120 and expels the air to exhaust port 130, and finally is discharged to outdoor space. Because accommodating cavity 110 has closed bottom surface, even if the top of volute 100 condenses water droplet, these water droplets can only flow down along the outside wall of volute 100, and will not drip into accommodating cavity 110.

[0035] Because the start-stop of wind wheel needs to rely on a part of electrical elements, for example, electrical elements such as capacitor, control switch, circuit breaker, contactor, relay, overload protector, these electrical elements are generally integrated on circuit board 300, and circuit board 300 generally does not have waterproof function, so circuit board 300 is easy to short circuit after being damp, and then damage part of electrical elements. Because the position of wind wheel is as air guide chamber 150, a large amount of air will be converged here, so circuit board 300 cannot be arranged in air guide chamber 150, so as to avoid direct contact with humid air, and the wind wheel will generate vibration and heat when working, and the environment is not conducive to the normal use of circuit board 300.

[0036] Therefore, as shown in the drawings, Figure 3 and Figure 4As shown, the accommodating cavity 110 is divided into the air guide chamber 150 and the electrical chamber 160 by the partition 140, the air guide chamber 150 is provided with a connecting piece 151 for mounting the wind wheel, the connecting piece 151 can be selected as a stud, which provides support and mounting for the wind wheel, and the above-mentioned exhaust port 130 is only communicated with the air guide chamber 150. The partition 140 is provided with a wire slot 141, which is located on the air outlet path of the wind wheel, and the air guide chamber 150 and the electrical chamber 160 are communicated through the wire slot 141. The electrical chamber 160 is used for mounting the circuit board 300, since the electrical chamber 160 is also located in the accommodating cavity 110, the water droplets on the top of the volute 100 cannot drop into the electrical chamber 160, and the electrical chamber 160 and the air guide chamber 150 are independently arranged, so that the influence of the wind wheel on the circuit board 300 in the electrical chamber 160 is weak when the wind wheel is working. The motor on the wind wheel and the circuit board 300 are electrically connected through wires, and the wire slot 141 on the partition 140 can be used for the wires to pass through, so as to meet the electrical connection of the motor and the circuit board 300.

[0037] Since the wire slot 141 is located on the air outlet path of the wind wheel, when the wind wheel rotates at high speed, part of the air will enter the electrical chamber 160 from the wire slot 141, and the utility model is thus arranged to introduce cold air to heat the circuit board 300. However, before this, a heat dissipation film 400 is needed to divide the electrical chamber 160 into an air flow area 161 and a non-air flow area 162, the air flow area 161 is closer to the wire slot 141 than the non-air flow area 162, and the two cannot be directly communicated due to the blocking of the heat dissipation film 400. The circuit board 300 is installed in the non-air flow area 162, since the depth of the accommodating cavity 110 is deep, but the horizontal area of the non-air flow area 162 is small, so the circuit board 300 is preferably arranged in the non-air flow area 162 in an inclined manner.

[0038] In order to limit the inclined posture of the circuit board 300, a mounting frame 500 is arranged in the electrical chamber 160, so that the circuit board 300 can be fixedly connected to the mounting frame 500. At the same time, the mounting frame 500 is provided with a wire inlet 510 communicated with the wire slot 141, the wires of the motor pass through the wire slot 141 and the wire inlet 510 in sequence, and finally extend into the non-air flow area 162 and are electrically connected to the wiring end on the circuit board 300. In order to avoid air entering the non-air flow area 162 from the wire inlet 510, a rubber sleeve can be wrapped around the wires, and the two ends of the rubber sleeve are wrapped with electrician's tape to block the two end openings of the rubber sleeve, and the rubber sleeve is in interference fit with the wire inlet 510, so as to fill the entire wire inlet 510.

[0039] On the other hand, the heat dissipation film 400 can be a metal heat dissipation film, which has certain toughness and heat conductivity. The metal heat dissipation film has a metal layer on the side facing the air flow area 161, and an insulating layer 410 on the side facing the non-air flow area 162, so as to prevent the circuit board 300 from being short-circuited due to contact with the conductor. Of course, the heat dissipation film 400 can also be other film structures, such as a polymer-based flexible composite film, an ultra-thin metal heat pipe or a graphene heat dissipation film. However, since the metal heat dissipation film has the lowest manufacturing cost, the heat dissipation film 400 of the present embodiment is preferably a metal heat dissipation film in order to save costs.

[0040] Specifically, the heat dissipation film 400 is attached to the inner side wall of the electrical chamber 160 and the mounting frame 500, and the actual size of the heat dissipation film 400 is greater than the planar size covered by the heat dissipation film 400. Since the actual size of the heat dissipation film 400 is greater than the planar size covered by the heat dissipation film 400, the heat dissipation film 400 is in a relaxed state at idle time, and will be attached to the circuit board 300 under the action of air pressure once air enters the air flow area 161. The present utility model does not specifically limit the shape and size of the heat dissipation film 400, as long as the heat dissipation film 400 can separate the air flow area 161 and the non-air flow area 162 from each other and be in a relaxed state at idle time, regardless of the shape and size of the heat dissipation film 400, which all fall within the protection scope of the present utility model.

[0041] Although the heat dissipation film 400 is in a relaxed state at idle time, it is in a tension state attached to the circuit board 300 at busy time. If the heat dissipation film 400 switches between the relaxed state and the tension state during the exhaust process, i.e. the heat dissipation film 400 is excited at a certain frequency during the exhaust process, noise will be generated. However, since the fan rotates at a constant speed during work, and there is a lack of air flow disturbance in the indoor space, the air pressure of the air flow entering the electrical chamber 160 from the air guide chamber 150 is relatively stable and will not fluctuate. Since the heat dissipation film 400 is subjected to constant air pressure during the exhaust process, the heat dissipation film 400 will not be excited at a certain frequency and generate noise.

[0042] It can be understood that the circuit board 300 is electrically connected to the motor and is also provided with a power line for electrical connection to the mains. In order to meet the power supply requirements of the circuit board 300, the side surface of the volute 100 is provided with a wire hole 163 communicating with the non-air flow area 162, which is used for the power line to pass through. Since the power line of the circuit board 300 needs to be electrically connected to the mains through the wire hole 163, in order to prevent water droplets from seeping into the non-air flow area 162 from the wire hole 163, the wire hole 163 is connected with a gland (not shown in the drawings) having a waterproof function.

[0043] As shown in Figure 1 and Figure 2 The cover plate 200 is used to cover the opening 120, and the cover plate 200 is fixedly connected with the volute 100 by screws. The cover plate 200 is provided with an air inlet 210 communicated with the air guide chamber 150 and a convection port 220 communicated with the electrical chamber 160, the air inlet 210 is an air inlet of the volute 100, and the size of the air inlet 210 is much larger than that of the convection port 220. The air is sucked into the air inlet 210 by the fan, and the air is discharged to the air outlet 130 by the vortex. The air in the air guide chamber 150 can pass through the wire slot 141 and the air flow area 161 in sequence and flow out from the convection port 220, and the air flowing out from the convection port 220 reenters the air guide chamber 150 under the pumping action of the fan, so as to form air circulation.

[0044] With the above structure, since the electrical chamber 160 is arranged in the volute 100 and is arranged independently from the air guide chamber 150, the condensed water droplets cannot drop into the electrical chamber 160, so as to ensure the safe use of the circuit board 300. In addition, part of the air in the wire slot 141 can enter the electrical chamber 160 under the driving of the fan during rotation of the fan, and since the heat dissipation film 400 divides the electrical chamber 160 into the air flow area 161 and the non-air flow area 162, the air can drive the heat dissipation film 400 to be attached to the circuit board 300 when passing through the air flow area 161, and the heat generated by the circuit board 300 is transmitted to the heat dissipation film 400 and exchanges heat with the air in the air flow area 161, which not only can dissipate heat of the circuit board 300, but also the circuit board 300 is prevented from directly contacting the air due to the blocking of the heat dissipation film 400, so as to prevent the circuit board 300 from being damaged due to damp. The arrangement of the utility model not only can keep the circuit board 300 of the exhaust fan away from the humid working environment, but also can dissipate heat of the circuit board 300, so as to effectively prolong the service life of the circuit board 300.

[0045] It should be noted that since the specific heat capacity of water is much larger than that of air, the greater the humidity of indoor air, the more obvious the heat dissipation effect of the air in the air flow area 161 on the circuit board 300.

[0046] In some embodiments of the utility model, the number of the convection ports 220 is multiple, and the setting positions of all the convection ports 220 should be as close to the positions corresponding to the circuit board 300 as possible. If the setting positions of all the convection ports 220 are far away from the positions corresponding to the circuit board 300, then the moving path of the air in the airflow area 161 will be far away from the circuit board 300, which is not conducive to driving the heat dissipation film 400 to be close to the circuit board 300. On the contrary, if the setting positions of all the convection ports 220 are close to the positions corresponding to the circuit board 300, then the moving path of the air in the airflow area 161 will be close to the circuit board 300, which is more conducive to driving the heat dissipation film 400 to be close to the circuit board 300.

[0047] Further, in order to increase the air flow entering the electrical chamber 160, the wire slot 141 extends from the bottom surface of the containing cavity 110 to the direction of the opening 120, so as to expand the size of the wire slot 141. At the same time, the total flow area of the convection ports 220 is smaller than the flow area of the wire slot 141, so as to form airflow pressurization in the electrical chamber 160, which is conducive to the close adhesion of the heat dissipation film 400 to the circuit board 300.

[0048] As shown in Figure 3 some embodiments of the utility model, the electrical chamber 160 is located beside the exhaust port 130, and the wire slot 141 is downstream of the wind wheel rotation direction relative to the exhaust port 130. That is, after the air is discharged to the exhaust port 130 by the wind wheel, with the continuous rotation of the wind wheel, the wind wheel discharges part of the air to the electrical chamber 160 through the wire slot 141. Through the above-mentioned setting, the shunting effect of the electrical chamber 160 on the airflow can be reduced, so that only a small part of the air enters the electrical chamber 160 after being concentratedly discharged to the exhaust port 130, so as to reduce the influence on the exhaust effect.

[0049] As shown in Figure 1 , the exhaust fan according to the second aspect of the utility model comprises the centrifugal exhaust fan shell according to the first aspect of the utility model, further comprises a wind wheel (not shown in the figure), a circuit board 300 and a grille plate (not shown in the figure), the wind wheel is installed on the connecting piece 151 of the air guide chamber 150, the wind wheel has an airflow direction from the air inlet 210 to the exhaust port 130 when working, the circuit board 300 is installed in the non-airflow area 162 of the electrical chamber 160, and the circuit board 300 is electrically connected with the wind wheel.

[0050] In addition, the volute 100 is provided with a mounting position 170 communicated with the opening 120, and the size of the mounting position 170 is greater than that of the opening 120. The mounting position 170 is used for mounting the grille plate, and at this time, the mounting position 170 is arranged outside the opening 120. When the grille plate is mounted on the mounting position 170, the grille plate can completely cover the cover plate 200, so as to avoid the direct contact of external objects with the wind wheel.

[0051] Since the exhaust fan adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0052] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art in the technical field without departing from the purpose of the utility model.

Claims

1. A centrifugal exhaust fan housing, characterized in that, include: A volute (100) has a receiving cavity (110) with an opening (120) on its front. The receiving cavity (110) is divided into an air guide chamber (150) and an electrical chamber (160) by a partition (140). The air guide chamber (150) is provided with a connector (151) for installing a wind turbine. One side of the volute (100) is provided with an exhaust port (130) communicating with the air guide chamber (150). The partition (140) has a wire groove (141) located at... On the air outlet path of the impeller, the air guide chamber (150) and the electrical chamber (160) are connected through the wire groove (141). The electrical chamber (160) is provided with a heat dissipation film (400), which divides the electrical chamber (160) into an airflow area (161) and a non-airflow area (162). The non-airflow area (162) is used to install a circuit board (300). The side of the volute (100) is provided with a wire hole (163) that communicates with the non-airflow area (162). A cover plate (200) covers the opening (120), the cover plate (200) having an air inlet (210) communicating with the air guide chamber (150) and a convection outlet (220) communicating with the electrical room (160).

2. The centrifugal exhaust fan housing according to claim 1, characterized in that: The electrical room (160) is located beside the exhaust port (130), and the cable tray (141) is downstream of the wind turbine in the direction of rotation relative to the exhaust port (130).

3. The centrifugal exhaust fan housing according to claim 1 or 2, characterized in that: The groove (141) extends from the bottom surface of the accommodating cavity (110) toward the opening (120).

4. The centrifugal exhaust fan housing according to claim 1, characterized in that: The heat dissipation film (400) is attached to the electrical chamber (160), and the actual size of the heat dissipation film (400) is larger than the plane size covered by the heat dissipation film (400).

5. The centrifugal exhaust fan housing according to claim 4, characterized in that: The heat dissipation film (400) is a metal heat dissipation film, and the metal heat dissipation film has an insulating layer (410) on the side facing the non-airflow region (162).

6. The centrifugal exhaust fan housing according to claim 1, characterized in that: The electrical room (160) is provided with a mounting bracket (500) for fixing the position of the circuit board (300), and the mounting bracket (500) is provided with a cable inlet (510) connected to the cable tray (141).

7. The centrifugal exhaust fan housing according to claim 1, characterized in that: The number of convection ports (220) is provided in multiples, and the convection ports (220) are located near the circuit board (300).

8. The centrifugal exhaust fan housing according to claim 1 or 7, characterized in that: The total flow area of ​​the convection ports (220) is less than the flow area of ​​the trough (141).

9. The centrifugal exhaust fan housing according to claim 1, characterized in that: The wire hole (163) is connected to a gland.

10. An exhaust fan, characterized in that, include: The centrifugal exhaust fan housing as described in any one of claims 1 to 9, wherein the volute (100) is provided with a mounting position (170) communicating with the opening (120), the size of the mounting position (170) being larger than the size of the opening (120); The impeller, which is mounted on the connector (151) of the air guide chamber (150), has an airflow direction from the air inlet (210) to the exhaust port (130) when it is working; A circuit board (300) is installed in a non-airflow area (162) of the electrical room (160), and the circuit board (300) is electrically connected to the wind turbine; A grating panel that covers the mounting position (170).

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