Fan wind scooper for transmission device and transmission device

Abstract

The utility model provides a fan wind scooper for a transmission device and the transmission device comprising the fan wind scooper. The transmission device comprises a box body; the input shaft extends into the box body; and the fan is positioned outside the box body and is driven by the input shaft. The fan wind scooper comprises a fan covering part and a wind scooper, wherein the fan covering part is configured to be used for covering the fan; the box body covering part is connected with the fan covering part, and the box body covering part is configured to be used for covering one part of the box body. The box body covering part follows the shape of the box body, so that air flow formed by rotation of the fan flows through the box body basically parallel to the surface of the box body. According to the fan wind scooper, the structure is optimized, the air volume obtained by a transmission device and the air speed flowing through the surface of the transmission device can be increased on the premise that the fan is not changed, and therefore the cooling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a transmission device, and more particularly to a fan air guide cover used for the transmission device. Background Art

[0002] The transmission devices used in industrial production will generate a lot of heat during operation. Usually, a fan is installed at the input shaft of the transmission device to dissipate the heat of the transmission device, and a fan cover is provided to protect the fan from external foreign objects and prevent the fan blades from hurting people around.

[0003] At present, in the case that the existing fans and fan covers cannot meet the cooling requirements, the main method is to change or increase the cooling method of the transmission device to improve the thermal power of the whole machine, such as choosing to use fans and cooling coils, oil stations, etc. at the same time. However, this means an increase in the number of materials, assembly processes and the cost of the whole machine, which is insufficient in terms of economic benefits and design effectiveness. Even in some special application environments, due to the lack of thermal power design, the standard transmission device design is difficult to meet the actual application, and then a special customized design is produced, which brings additional material costs and stable operation risks.

[0004] Based on the above background, an improved fan and fan guard arrangement for providing adequate cooling capability is desired. Utility Model Content

[0005] In order to solve one or more problems in the prior art, the utility model proposes a fan air duct for a transmission device. The fan air duct has an optimized structure, which can increase the air volume obtained by the transmission device and the wind speed flowing through the surface of the transmission device without changing the fan, thereby improving the cooling efficiency of the fan. In addition, because the contactable edge of the fan air duct is away from the rotating fan, the internal grille can be removed on the premise of meeting the design and use safety, further reducing the loss of cooling air volume. At the same time, the area of ​​the transmission device surface covered by the fan air duct is increased, which means that there are more selectable connection positions, and thus a more friendly assembly position can be selected to reduce the difficulty of assembly. All of the above changes can also bring about a reduction in the number and weight of parts, thereby achieving cost optimization. In summary, the utility model realizes the optimized design of the fan air duct structure from the perspectives of improving the cooling capacity of the fan, reducing the difficulty of assembly, and reducing material costs.

[0006] Specifically, the utility model proposes a fan air duct for a transmission device, the transmission device comprising: a housing; an input shaft extending into the housing; a fan located outside the housing and driven by the input shaft, wherein the fan air duct comprises: a fan covering portion, the fan covering portion being configured to cover the fan; a housing covering portion connected to the fan covering portion, the housing covering portion being configured to cover a portion of the housing, wherein the housing covering portion follows the shape of the housing so that the wind flow formed by the rotation of the fan flows through the housing substantially parallel to the surface of the housing.

[0007] In one embodiment, the fan covering portion of the fan air guide is a conical cover shell, which includes an air inlet at the small end of the conical cover shell, and is connected to the box covering portion at the large end of the conical cover shell, and wherein the box covering portion includes a front side panel, a top side panel and a rear side panel that are connected in sequence and arranged around the large end edge of the fan covering portion, and the front side panel, the top side panel and the rear side panel are respectively configured to cover a portion of the front side surface, the top side surface and the rear side surface of the box.

[0008] In one embodiment, a certain distance is maintained between the box covering portion of the fan air guide cover and the surface of the box, so that a human hand cannot touch the fan through the distance.

[0009] In one embodiment, laser-cut holes are opened on the box covering portion of the fan air guide cover, and the laser-cut holes include one or more of the following: a mounting hole for installing an oil nozzle; a wire hole for installing a thermometer; a wire hole for installing a status monitoring device; and a wire hole for installing an auxiliary drive.

[0010] In one embodiment, the fan air guide comprises an air guide plate fixed on an inner wall of the housing cover portion, and the air guide plate is configured to extend inwardly toward a surface of the housing in a wind flow direction.

[0011] In one embodiment, the air guide plate includes one or more of the following: a first air guide plate and a second air guide plate welded on the top side plate of the box covering part, the first air guide plate and the second air guide plate extend toward the top side surface of the box in the wind flow direction; a third air guide plate welded on the front side plate of the box covering part, the third air guide plate extends toward the front side surface of the box in the wind flow direction; and a fourth air guide plate welded on the rear side plate of the box covering part, the fourth air guide plate extends toward the rear side surface of the box in the wind flow direction.

[0012] In one embodiment, the fan air scoop is directly mounted on the housing by means of the housing cover portion.

[0013] In one embodiment, the box covering part is installed on the box by a threaded connection device, and the threaded connection device includes: a stud, one end of which is screwed into a threaded hole on the box, and the other end passes through a corresponding through hole on the box covering part; a first nut, which is tightened on the stud on the outer side of the box covering part tightly against the box covering part; a second nut, which is tightened on the stud on the inner side of the box covering part tightly against the box covering part; and a gasket arranged between the first nut and the box covering part, and / or between the second nut and the box covering part.

[0014] In one embodiment, the fan air guide comprises a circumferential grille at the air inlet, and the gap design criterion of the circumferential grille is that fingers cannot enter, which complies with the European standard requirement DIN EN ISO 13857.

[0015] The utility model also proposes a transmission device, which includes: a housing; an input shaft extending into the housing; and a fan located outside the housing and driven by the input shaft, wherein the transmission device also includes a fan air guide cover according to any of the above items.

[0016] In general, the various embodiments of the present invention can be combined and coupled in any possible way within the scope of the present invention. These and other aspects, features and / or advantages of the present invention will be apparent and explained with reference to the embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Embodiments of the present invention will be described by way of example with reference to the following drawings, in which:

[0018] Figure 1 A perspective view of a transmission with a prior art fan guard installed is shown;

[0019] Figure 2 A perspective view of a prior art fan cover is shown;

[0020] Figure 3 A perspective view showing a transmission device equipped with a fan air guide according to an embodiment of the utility model;

[0021] Figure 4 A perspective view of a fan air guide cover according to an embodiment of the utility model is shown;

[0022] Figure 5 Another perspective view of a fan air shroud according to an embodiment of the present invention is shown;

[0023] Figure 6a-6d A top view, a top cross-sectional view, a front view and a front cross-sectional view of a transmission device equipped with a prior art fan cover are respectively shown, wherein wind flow is represented by arrowed lines;

[0024] Figures 7a-7d A top view, a top cross-sectional view, a front view and a front cross-sectional view of a transmission device equipped with a fan air guide according to an embodiment of the utility model are respectively shown, wherein the wind flow is also represented by arrowed lines;

[0025] Figure 8 An enlarged cross-sectional view shows a threaded connection device between a fan air guide cover and a transmission device according to an embodiment of the utility model;

[0026] Fig. 9 A front view of a fan shroud according to an embodiment of the utility model is shown, wherein a protective grille at the air inlet of the fan shroud is clearly shown.

[0027] It should be understood that the drawings only illustrate one way of implementing the present invention and should not be construed as limiting other possible embodiments within the scope of the appended claims. The scope of protection of the present invention is limited only by the appended claims. DETAILED DESCRIPTION

[0028] The specific embodiments and modifications of the present utility model will be described in detail below with reference to the accompanying drawings.

[0029] For ease of description, spatially relative terms such as "inside", "outside", "upper", "lower", "top", "bottom", "front", "back", etc. are used herein to define various components and their relative positional relationships, but this is only for the device orientation given in the drawings and is not restrictive. When the orientation of the device changes, these spatial relative relationships may also be reversed or changed without affecting the protection scope of the present utility model.

[0030] Figure 3 A perspective view showing a transmission device equipped with a fan air guide according to an embodiment of the utility model, Figure 4 A three-dimensional view of a fan air guide cover according to an embodiment of the utility model is shown.

[0031] like Figure 3 As shown, the transmission device 10 includes a housing 11, an input shaft 12 extending into the housing 11, a transmission mechanism (not shown) connected to the input shaft 12 and located in the housing 11, and an output shaft (not shown) connected to the transmission mechanism and extending out of the housing 11. The housing 11 is a rectangular parallelepiped extending in the longitudinal direction, and has longitudinal end faces 11a and 11b (see Figures 7a-7d ,exist Figure 3In the embodiment, the longitudinal end face 11a is not visible because it is covered) and multiple longitudinal side faces extending in the longitudinal direction, the multiple longitudinal side faces include a top side surface 11c and a bottom side surface 11d opposite to each other, and a front side surface 11e and a rear side surface 11f opposite to each other. In a preferred embodiment, the input shaft 12 can extend into the housing 11 from the longitudinal end face 11a, and the output shaft can extend out of the housing 11 from the front side surface 11e. In this case, the transmission device 10 is a vertical transmission device, which can change the transmission direction by 90 degrees, and is suitable for scenes with limited space or the need to transmit power to the vertical direction. Of course, those skilled in the art will understand that the utility model does not limit the configuration of the input shaft and the output shaft of the transmission device.

[0032] The transmission device 10 is, for example, a gear box, a transmission case, or a reduction box. To dissipate heat, the transmission device 10 further includes a fan 13 located outside the longitudinal end surface 11a of the housing 11 (see Figures 7a-7d ). More generally, the fan 13 is located outside the housing 11 and is driven by the input shaft 12. Preferably, the fan 13 is fixed to the input shaft 12, so that it is directly driven by the input shaft 12. The fan 13 can be a cast mechanical fan, which is cast together with the input shaft 12 or cast separately and assembled together. Thus, the fan 13 can rotate with the rotation of the input shaft 12, and pull the air outside toward the housing 11 to form a cooling airflow to dissipate heat from the housing 11 and the like. In this way, an additional drive motor may not be provided for the fan 13. This can simplify the structure and save installation space and cost.

[0033] Furthermore, the transmission device 10 includes a fan air duct 14. The fan air duct 14 is configured to cover the fan 13 and a portion of the housing 11. On the one hand, the fan 13 is separated from the outside world to prevent foreign objects from affecting the operation of the fan and preventing the fan from harming the staff. On the other hand, the airflow formed by the fan 13 is guided to more surfaces of the housing to improve the heat dissipation effect. This will be described in further detail below.

[0034] Specifically, the fan air guide 14 includes a fan covering portion 141 and a case covering portion 142. The case covering portion 142 is connected to the fan covering portion 141. The fan covering portion 141 is configured as a conical cover for covering the fan 13, which includes an air inlet 141a at a small end and is connected to the case covering portion 142 at a large end. The case covering portion 142 follows the shape of the case 11 and is formed as a cover surrounding a roughly rectangular space, so that the wind flow formed by the rotation of the fan 13 flows through the case 11 in a manner substantially parallel to the surface of the case 11. The case covering portion 142 is connected to the fan covering portion 141 at one end and is an open end at the other end, which is formed as an air outlet. Further reference Figure 4, the box covering part 142 includes a front side plate 142a, a top side plate 142b and a rear side plate 142c which are arranged in sequence around the large end edge of the fan covering part 141. The adjacent side plates are perpendicular to each other, that is, the front side plate 142a and the top side plate 142b are perpendicular to each other, and the top side plate 142b and the rear side plate 142c are perpendicular to each other. The front side plate 142a is used to cover a part of the front side surface 11e of the box 11, the top side plate 142b is used to cover a part of the top side surface 11c of the box 11, and the rear side plate 142c is used to cover a part of the rear side surface 11f of the box 11. In particular, the box covering part 142 does not include a bottom side plate for covering the bottom side surface 11d of the box 11, because the bottom side surface 11d of the box 11 is usually installed close to the base (not shown in the figure), so there is no space between the bottom side surface 11d and the base for the bottom side plate to extend into.

[0035] During the assembly process, the staff can move the open end of the fan guide cover 14 toward the longitudinal end face 11a of the case 11 until the fan 13 and a portion of the longitudinally extending side of the case 11 are covered therein, and the input shaft 12 is extended from the air inlet 141a, and then use a fastening device (which will be further described below) to fix the fan guide cover 14 in place.

[0036] Figure 1 A perspective view of a transmission with a prior art fan guard installed is shown, and Figure 2 A perspective view of a prior art fan guard is shown. It will be appreciated that, in addition to the fan guard 14', Figure 1 and Figure 2 The transmissions shown are essentially the same, so no further details will be given here. In addition, similar reference numerals will be used to indicate corresponding parts. Figure 1 and Figure 2 As shown, the fan cover 14' of the prior art only includes a fan covering portion. Compared with the fan cover 14' of the prior art, the fan air guide cover 14 according to the embodiment of the utility model also includes a box covering portion 142, and the box covering portion 142 extends a certain length along the longitudinal direction of the box, thereby covering a portion of the longitudinally extending side of the box 11. In this way, the fan air guide cover 14 can not only guide the wind flow to the longitudinal end surface 11a of the box 11, but also further guide the wind flow to the longitudinally extending side of the box 11, such as guiding it to the top side surface 11c, the front side surface 11e and the rear side surface 11f, so that the high-speed stage of the transmission device is cooled more effectively.

[0037] Combine the following Figure 6a-6d and Figures 7a-7d The air guiding effect of the fan air guiding cover according to the utility model is introduced more intuitively. Figure 6a-6dThe top view, top cross-sectional view, front view and front cross-sectional view of the transmission device installed with the prior art fan cover 14' are shown respectively, and Figures 7a-7d The top view, top cross-sectional view, front view and front cross-sectional view of the transmission device equipped with the fan air guide 14 according to the embodiment of the utility model are respectively shown. In the above figures, the wind flow is represented by the line with arrows.

[0038] It can be seen that since the fan cover 14' of the prior art only has a fan covering portion, the cooling airflow from the fan 13' will diffuse out at the outlet of the fan cover 14' through the space / gap between the fan cover 14' and the housing 11'. Figure 6a and Figure 6b As can be seen from the figure, the wind flow spreads out as soon as it reaches the front side surface 11e' and the rear side surface 11f' of the box body 11'. Figure 6c and Figure 6d It can be seen that the wind flow spreads out as soon as it reaches the top side surface 11c' of the box body 11'. In contrast, the fan air guide 14 according to the embodiment of the utility model also includes a box body covering portion 142 extending a certain length along the longitudinal direction. The box body covering portion 142 is designed to follow the structure of the box body 11 and maintains an appropriate distance from the surface of the box body 11, so as to guide the cooling wind flow from the fan 13 through the surface of the box body 11 in a manner substantially parallel to the surface of the box body 11, thereby promoting the wind flow to gather around the box body 11. Specifically, Figure 7a and Figure 7b It can be seen that the cooling airflow, under the guidance of the box cover portion 142, flows closely along the surface of the box 11 and passes through the front side surface 11e and the rear side surface 11f of the box 11. Figure 7c and Figure 7d It can be seen that the cooling airflow, under the guidance of the box cover portion 142, flows through the top surface 11c of the box 11, close to the surface of the box 11. This can increase the amount of cooling air passing through the surface of the box 11, prolong the contact time between the cooling airflow and the surface of the box 11, and thus significantly improve the cooling efficiency.

[0039] It is worth emphasizing that in Figure 1 and Figure 2In the transmission device 10' of the prior art shown, the space / spacing between the fan cover 14' and the housing 11' is relatively large. In order to prevent a person's hand from accidentally reaching into the fan cover 14' and being injured, a protective grid plate 15' must be provided at the air outlet of the fan cover 14'. The grid plate 15' will inevitably block part of the wind flow, thereby reducing the cooling efficiency of the fan. However, according to the embodiment of the utility model, the housing covering portion 142 of the fan air duct 14 extends to the top side surface 11c, the front side surface 11e and the rear side surface 11f of the housing 11, and the housing covering portion 142 maintains an appropriate spacing with the surface of the housing 11, so that a person's hand cannot contact the fan 13 through the spacing, and therefore, the fan air duct 14 may not include any protective grid plate provided at the air outlet. This can further improve the cooling efficiency of the fan 13. In addition, by setting the spacing between the fan air duct 14 and the fan 13 and the housing 11 to a smaller value within an appropriate range, the flow rate of the cooling air flow can also be increased, further improving the cooling efficiency.

[0040] like Figure 4 As shown, the front side plate 142a, top side plate 142b and rear side plate 142c of the box covering part 142 of the fan air duct 14 are not regular rectangular plates, but are cast, cut or stamped into irregular shapes to avoid interference with the related structures on the front side surface 11e, top side surface 11c or rear side surface 11f of the box 11, that is, to reserve space for the above-mentioned related structures. For example, the front side plate 142a and the rear side plate 142c of the box covering part 142 cut off the parts corresponding to the positions of the observation hole cover and the bearing end cover, so as to facilitate internal inspection and simple maintenance without disassembling the fan air duct. In addition, removable cover plates are provided on the front side plate 142a, the top side plate 142b and the rear side plate 142c of the box covering part 142, and the positions of these cover plates correspond to the positions of the box feet and the positions of the box lifting holes, so that by removing these cover plates, the box feet are exposed for fixing the whole machine and the box lifting holes are exposed for lifting the whole machine.

[0041] Further as Figure 5As shown, a plurality of laser cutting holes are provided on the box cover portion 142 of the fan air duct 14, and these laser cutting holes are laser cutting positions reserved for configuring sensors, etc. Specifically, a laser cutting installation hole T for installing an oil nozzle is provided at a corresponding position of the top side plate 142b of the box cover portion 142; a laser cutting line hole P for installing a thermometer, a laser cutting line hole A for installing a status monitoring device, and a laser cutting line hole H for installing an auxiliary driver, etc. are provided at a corresponding position of the front side plate 142a. These laser cutting holes are easy to process and allow the installation and debugging of these sensors after the fan air duct 14 is installed on the box 11. In addition, these laser cutting holes can prevent the communication of these sensors from being interfered with, and facilitate the inspection and maintenance of these sensors, etc.

[0042] Return to reference Figure 4 The fan air guide cover 14 also includes a plurality of air guide plates 16 fixed on the inner wall of the box cover portion 142. The plurality of air guide plates 16 include first and second air guide plates 16a, 16b welded on the top side plate 142b, a third air guide plate 16c welded on the front side plate 142a, and a fourth air guide plate 16d welded on the rear side plate 142c. It will be understood that the number and position of the plurality of air guide plates 16 can be changed. The plurality of air guide plates 16 are configured to extend inwardly toward the surface of the box 11 in the wind flow direction (i.e., the axial direction of the input shaft 12, also referred to as the longitudinal direction of the box 11), and form a certain angle with the axial direction of the input shaft 12, so as to press the cooling air flow generated by the rotation of the fan 13 toward the surface of the box 11, thereby reducing or even preventing the cooling air flow from escaping in the direction away from the surface of the box 11 when leaving the fan cover portion 141, and maximizing the use of the air flow for cooling the box 11. The "extending inward" mentioned here refers to extending toward the input shaft 12 or toward the surface of the housing 11. For example, the first and second air guide plates 16a, 16b extend toward the top surface of the housing 11, thereby pressing the wind flow toward the top surface of the housing 11. The third air guide plate 16c extends toward the front surface of the housing 11, thereby pressing the wind flow toward the front surface of the housing 11. The fourth air guide plate 16d extends toward the rear surface of the housing 11, thereby pressing the wind flow toward the rear surface of the housing 11. It will be understood that the air guide plate 16 can also be fixed to the inner wall of the fan air guide cover 14 by other means, such as threaded connection, snap-on connection, plug-in connection, key pin connection, riveting or bonding. Furthermore, in order to avoid blocking the wind flow, an opening can be opened on the air guide plate 16.

[0043] Combine the following Figure 3 , Figure 4 and Figure 8The fixing connection method of the fan air guide cover 14 is described in detail. As mentioned above, the fan cover 14' of the prior art only includes the fan covering part. In order to fix the fan cover 14' to the transmission device, an additional intermediate connecting plate 16' (such as Figure 2 As shown). It will be understood that these intermediate connecting plates 16' will prevent a portion of the cooling airflow from flowing to the housing of the transmission device, thereby reducing the cooling efficiency. In contrast, the fan air duct 14 according to the embodiment of the present disclosure also includes a housing cover portion 142 extending on a portion of the housing 11, so that the fan air duct 14 can be directly installed on the housing 11 with the help of the housing cover portion 142, providing more installation position options. In addition, the existing threaded holes on the housing 11 can be reused, thereby reducing the complexity and cost of the housing model.

[0044] Further, the fan air guide 14 according to the embodiment of the utility model can be fixedly mounted on the box body 11 only by threaded connection between the front side plate 142a and the rear side plate 142c and the box body 11. This connection method is simple and easy to operate, and is stable and reliable. In particular, the front side plate 142a and the rear side plate 142c can be fixed to the box body 11 by four threaded connection devices 17 respectively. Figure 8 The details of the threaded connection 17 are shown in an enlarged cross-sectional view. Figure 8 As shown, the threaded connection device 17 includes a stud 171, a first nut 172, a second nut 173, a gasket 174, etc. One end of the stud 171 is screwed into the threaded hole on the housing 11, and the other end passes through the corresponding through hole on the housing cover 142 of the fan air guide 14. The first nut 172 cooperates with the gasket 174, and is tightened on the stud 171 on the outside of the fan cover 142, close to the fan cover 142, and the second nut 173 is tightened on the stud 171 on the inside of the fan cover 142, close to the fan cover 142. In other words, the second nut 173 is tightened on the stud 171 between the fan cover 142 and the housing 11, close to the fan cover 142. It will be understood that more nuts and gaskets can also be used. In addition, the setting position of the gasket can also change. For example, the gasket can also be set between the second nut 173 and the fan cover 142.

[0045] Thus, the threaded connection device 17 uses the first nut 172 and the second nut 173 to fix the stud 171, providing double protection, ensuring the stability of the connection, and providing a stronger anti-loosening ability and a more uniform load distribution. In addition, the use of the gasket 174 can provide a certain elasticity between the nuts 172, 173 and the fan air guide 14, which helps to absorb and reduce the vibration generated by the operation of the transmission device and the noise caused thereby.

[0046] like Fig. 9 As shown, the fan air guide cover 14 according to the embodiment of the present disclosure includes a circumferential grille at the air inlet 141a. The circumferential grille is ergonomic while protecting the air intake, and the grid gap design criterion is that fingers cannot enter, that is, it meets the latest European standard DIN EN ISO 13857. The circumferential grille can be formed by laser cutting and includes a plurality of arc-shaped through holes evenly distributed along the central circular hole. The central circular hole can be coaxially arranged with the input shaft 12 of the transmission device 10 and the fan 13.

[0047] In summary, the fan air guide cover of the utility model optimizes the structure and conforms to different transmission devices and fans. The data from the test bench test shows that the overall cooling performance of the transmission device is improved by 10-20% through this design.

[0048] Although the utility model has been described in conjunction with the above-mentioned specific embodiments, it should not be understood as being limited to the examples presented in any way. The scope of the utility model is defined by the appended claims. In the context of the claims, the terms "comprise" or "include" do not exclude other possible elements or steps. In addition, references such as "one" or "an" should not be interpreted as excluding multiple. The use of reference symbols for elements shown in the figures in the claims should not be interpreted as limiting the scope of the utility model. In addition, the various features mentioned in different claims may be advantageously combined, and the mention of these features in different claims does not exclude that the combination of these features is impossible and advantageous. In addition, the "first" and "second" used in the utility model are only used to distinguish the relevant components, and are not intended to give them any priority attributes.

Claims

1. A fan air guide cover (14) for a transmission device (10), the transmission device (10) comprising: A housing (11); an input shaft (12) extending into the housing (11); a fan (13) located outside the housing (11) and driven by the input shaft (12), characterized in that: The fan air guide cover (14) comprises: a fan covering portion (141), the fan covering portion (141) being configured to cover the fan (13); a case covering portion (142) connected to the fan covering portion (141), wherein the case covering portion (142) is configured to cover a portion of the case (11), The box cover portion (142) follows the shape of the box (11), so that the wind flow formed by the rotation of the fan (13) flows through the box (11) substantially parallel to the surface of the box (11).

2. The fan air guide cover (14) according to claim 1, characterized in that: The fan covering portion (141) of the fan air guide cover (14) is a conical cover shell, including an air inlet (141a) at the small end of the conical cover shell, and connected to the box covering portion (142) at the large end of the conical cover shell, and wherein the box covering portion (142) includes a front side plate (142a), a top side plate (142b) and a rear side plate (142c) which are arranged in sequence around the large end edge of the fan covering portion (141), and the front side plate (142a), the top side plate (142b) and the rear side plate (142c) are respectively configured to cover a portion of the front side surface (11e), the top side surface (11c) and the rear side surface (11f) of the box (11).

3. The fan air guide cover (14) according to claim 1 or 2, characterized in that: A certain distance is maintained between the box covering part (142) of the fan air guide cover (14) and the surface of the box (11), so that a human hand cannot touch the fan (13) through the distance.

4. The fan air guide cover (14) according to claim 1 or 2, characterized in that: The box covering part (142) of the fan air guide cover (14) is provided with a laser cutting hole, wherein the laser cutting hole comprises one or more of the following: Mounting hole for installing the grease nozzle (T); Wire hole for installing thermometer (P); Cable holes (A) for mounting condition monitoring equipment; and Cable hole (H) for mounting auxiliary drive.

5. The fan air guide cover (14) according to claim 2, characterized in that: The fan air guide cover (14) comprises an air guide plate (16) fixed on the inner wall of the box cover part (142), and the air guide plate (16) is configured to extend inwardly toward the surface of the box (11) in the direction of wind flow.

6. The fan air guide cover (14) according to claim 5, characterized in that: The wind deflector (16) includes one or more of the following: a first air guide plate (16a) and a second air guide plate (16b) welded to a top side plate (142b) of the box cover portion (142), wherein the first air guide plate (16a) and the second air guide plate (16b) extend in the wind flow direction toward the top side surface (11c) of the box (11); a third air guide plate (16c) welded to the front side plate (142a) of the box cover portion (142), the third air guide plate (16c) extending in the wind flow direction toward the front side surface (11e) of the box (11); and A fourth air guide plate (16d) is welded to a rear side plate (142c) of the box cover portion (142), and the fourth air guide plate (16d) extends toward a rear side surface (11f) of the box (11) in the wind flow direction.

7. The fan air guide cover (14) according to claim 1 or 2, characterized in that: The fan air guide cover (14) is directly mounted on the box body (11) by means of the box body covering part (142).

8. The fan air guide cover (14) according to claim 7, characterized in that: The box cover part (142) is mounted on the box (11) via a threaded connection device (17), wherein the threaded connection device (17) comprises: A stud bolt (171), one end of which is screwed into a threaded hole on the box body (11), and the other end of which passes through a corresponding through hole on the box body covering portion (142); A first nut (172), the first nut (172) being screwed onto the stud (171) on the outer side of the box covering portion (142) and tightly attached to the box covering portion (142); a second nut (173), the second nut (173) being screwed onto the stud (171) on the inner side of the box cover portion (142) and tightly attached to the box cover portion (142); and A gasket (174) is disposed between the first nut (172) and the box cover portion (142), and / or disposed between the second nut (173) and the box cover portion (142).

9. The fan air guide cover (14) according to claim 2, characterized in that: The fan air guide cover (14) comprises a circumferential grille at the air inlet (141a), and the gap design criterion of the circumferential grille is that fingers cannot enter, which complies with the European standard DIN EN ISO 13857.

10. A transmission device (10), comprising: Box body (11); An input shaft (12) extending into the housing (11); as well as a fan (13) located outside the housing (11) and driven by the input shaft (12), Characterized in that the transmission device (10) further comprises a fan air guide cover (14) according to any one of Claims 1-9.

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