CN214311586U

CN214311586U - Air duct wind shielding structure, wind shielding cover and server

Info

Publication number: CN214311586U
Application number: CN202120354734.5U
Authority: CN
Inventors: 柳顺兵; 常永良; 吴恭英
Original assignee: Zhejiang Uniview Technologies Co Ltd
Current assignee: Zhejiang Uniview Technologies Co Ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-09-28
Anticipated expiration: 2031-02-08

Abstract

The application discloses wind channel wind-shielding structure, windshield and server, wind channel wind-shielding structure is including setting up fixed part and the deep bead in the wind channel, wherein: the fixed part is fixed on the inner wall of the air duct, one end of the wind shield is rotatably connected with the fixed part, the other end of the wind shield faces the incoming wind side of the air duct, and the other end of the wind shield can rotate under the action of the incoming wind of the air duct to block the subsequent incoming wind; the application also discloses a windshield with the air duct wind shielding structure and a server comprising the windshield; the air distribution in the server can be optimized, and the heat dissipation effect is improved.

Description

Air duct wind shielding structure, wind shielding cover and server

Technical Field

The application relates to but is not limited to a heat dissipation technology, in particular to an air duct wind shielding structure, a wind shield and a server.

Background

Heat dissipation from the server has a significant impact on the performance of the server. Taking a common 2U standard server as an example, 12 hard disks of 3.5 inches are arranged at an air inlet of the server, a fan row is arranged in the middle of the server to provide system air for the whole system, a server control single board (provided with a CPU module and a random access memory) is arranged at the downstream of the fan row, and a standard PCIe (peripheral component interconnect express) expansion plug-in card is arranged at the tail of the fan row. The system air is mainly used for radiating heat for a system CPU module radiator, a PCIe expansion plug-in card and a random access memory (such as DDR), and the larger the air quantity provided by the fan row is, the lower the temperature of each device is, and the longer the service life of the equipment is facilitated. In practice, the performance requirement of the server is high, the power consumption of the CPU module increases dramatically, and the existing heat dissipation structure is difficult to satisfy the large air volume required for heat dissipation of high-power-consumption modules such as the CPU.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an air duct wind shielding structure, a wind shield cover and a server, which can optimize air distribution and improve the heat dissipation effect.

The embodiment of the application provides an air duct wind-shielding structure, and air duct wind-shielding structure is including setting up fixed part and deep bead in the wind channel, wherein:

the fixed part is fixed on the air duct inner wall, one end of the wind shield is rotatably connected with the fixed part, the other end of the wind shield faces the wind coming side of the air duct, and the other end of the wind shield can rotate under the wind coming effect of the air duct to block subsequent wind.

The embodiment of the application further provides a wind shield, and the wind shield is used for being installed in the server to adjust the air distribution inside the server, the wind shield is provided with a plurality of wind channels as the air passing channel of the equipment, and at least one of the wind channels is provided with the wind shielding structure of the wind channel.

The embodiment of the application further provides a server, the server comprises a shell, a fan, a random access memory, other heating equipment and the wind shield, wherein the fan, the random access memory, the other heating equipment and the wind shield are arranged in the shell, the fan is arranged to generate wind flow to cool the random access memory and the other heating equipment, a plurality of wind channels on the wind shield are used as wind passing channels of the random access memory and the other heating equipment, and at least one wind channel with a wind channel wind shielding structure is used as the wind passing channel of the random access memory.

Compared with some technologies, the embodiment of the application has the following beneficial effects:

according to the air duct wind shielding structure provided by the embodiment of the application, the wind shield can rotate to seal the air duct under the action of wind coming from the air duct, so that the wind coming from the air duct is blocked, and the automatic closing function of the air duct can be realized. The wind shield can be arranged on any surface of the inner wall of the air duct, and the installation position is flexible. And, under the effect that the wind channel came, can prevent that the deep bead from opening because of the unexpected reversal of circumstances such as vibrations, improved wind channel wind-shielding structure's operational reliability.

The windshield that this application embodiment provided is provided with aforementioned wind channel structure of keeping out the wind in its wind channel, can optimize the amount of wind distribution in the server, under the big or small circumstances of the same amount of wind, improves the radiating efficiency of fan, and the reinforcing is to the cooling amount of wind of the great equipment of heat dissipation capacity such as CPU module, reduces the extravagant condition of cooling air, has improved the practicality of windshield.

The server provided by the embodiment of the application has a good internal heat dissipation effect, can effectively reduce the temperature of the CPU module and the expansion plug-in card, ensures the integral stable operation of the server, and improves the performance and the working reliability of the server.

Other features and advantages of the present application will be set forth in the description that follows.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

FIG. 1 is a schematic view of a conventional windshield;

fig. 2 is a schematic structural diagram of a server according to a first embodiment of the present application;

fig. 3 is a first structural schematic view (the wind deflector is in the first position) of the wind shielding structure of the wind tunnel according to the first embodiment of the present application;

fig. 4 is a schematic structural diagram of a wind shielding structure of an air duct according to the first embodiment of the present application (the wind shielding plate is in the first position);

fig. 5 is a schematic structural diagram of a third air duct wind shielding structure according to the first embodiment of the present application (the wind shielding plate is in the second position);

fig. 6 is a schematic structural diagram of a fourth air duct wind shielding structure according to the first embodiment of the present application (the wind shielding plate is in the second position);

fig. 7 is a schematic structural diagram of a fifth air duct wind shielding structure according to the first embodiment of the present application (the wind shields in a portion of the air duct are in the first position, and the wind shields in a portion of the air duct are in the second position).

Illustration of the drawings:

1-wind shield, 11-wind channel, 2-wind channel wind shield structure, 21-wind shield, 22-fixing plate, 23-rotating shaft, 3-fan, 4-random access memory, 41-installation slot position, 5-CPU module, 6-expansion card and 7-hard disk.

Detailed Description

To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

In a server commonly used at present, a fan is used to cool a random access memory (such as a DDR) and a CPU module, and a wind scooper structure (for example, patent 201921751548.4) is used to attempt to concentrate more wind in a place with a high heat dissipation requirement, such as the CPU module. But because the wind resistance is different in all places in the server, such as: after the power consumption of the CPU module exceeds 180W, the density of the fins of the CPU module is increased, the resistance of a radiator of the CPU module is large, and the wind resistance in an air duct corresponding to the CPU module is large, so that the heat dissipation of the high-power-consumption CPU module cannot be met; the random access memory has low heat dissipation requirement, but the air volume passing through the small wind resistance is large, so that the air outlet temperature of the random access memory is relatively low, and the air volume is greatly wasted. The wind scooper cannot adjust the wind distribution well, and the wind resistance of the area where the CPU module is located is further increased due to the wind scooper.

In the actual use process, part of the random access memories are not in place (for example, all the random access memories are not installed in the server at times), when the random access memories corresponding to part of the air channels are not in place, that is, not installed, the wind resistance of the part of the air channels is directly reduced, more cooling air is blown out from the part of the air channels, and the heat-generating equipment is not cooled, so that the waste of the cooling air is caused; meanwhile, the air volume in other air channels can be relatively reduced, and the cooling effect on modules such as a CPU is further reduced.

Some manufacturers design a random access memory model (i.e., a false random access memory), and after the random access memory in the server is removed, the random access memory model is installed in the installation slot to avoid the excessive reduction of the wind resistance of the corresponding air duct, but this method is time-consuming and labor-consuming, has poor effect (more cooling wind still runs off from the air duct), and may omit to install the random access memory in the subsequent use process.

Example one

The embodiment of the application provides an air duct wind shielding structure 2, as shown in fig. 3 to 7, air duct wind shielding structure 2 includes a fixing portion and a wind shielding plate 21 arranged in air duct 11, wherein: the fixed part is fixed on the wind channel 11 inner wall, and the one end of deep bead 21 rotationally is connected with the fixed part, and the other end of deep bead 21 is towards the incoming wind one side of wind channel 11, and the other end of deep bead 21 can rotate in order to block subsequent wind channel incoming wind (cooling air) under the effect of the incoming wind in wind channel 11.

Set up wind channel structure 2 that keeps out wind in wind channel 11, can seal wind channel 11 when needs, avoid the cooling air to run off from this wind channel 11 continuously, reduced the extravagant phenomenon of cooling air. Under normal operation, the cooling air can still pass through the air duct 11 normally.

One end of the wind deflector 21 may be mounted on any surface of the inner wall of the air duct 11 (i.e., the fixing portion may be fixed on the upper wall, the side wall or the bottom of the inner wall of the air duct 11), and the other end of the wind deflector 21 faces the incoming air side of the air duct 11. The devices in the air duct 11 may be arranged on the side opposite to the fixed part, for example: one end (a fixing part) of the wind shield 21 is arranged on the upper wall of the air duct 11, the equipment is arranged on the bottom surface of the air duct 11 (the lower part of the air duct 11), and the other end of the wind shield 21 props against the upper end of the equipment; when the device is not in place, the other end of the wind deflector 21 is turned downwards by the incoming wind and its own weight of the wind tunnel to block the subsequent incoming wind. Or, one end (fixed part) of the wind deflector 21 is arranged on the left side wall of the air duct 11, the equipment is arranged on the right side wall of the air duct 11, and the other end of the wind deflector 21 is propped against the top end of the equipment. When the device is not in place, the other end of the wind deflector 21 is turned in the horizontal plane under the incoming wind of the wind tunnel to block the subsequent incoming wind. Or, one end (fixed part) of the wind deflector 21 is arranged on the bottom surface of the air duct 11 (lower part of the air duct 11), the equipment is installed on the upper wall of the air duct 11, and the other end of the wind deflector 21 falls down freely under the action of gravity and is attached to the bottom surface of the air duct 11 (lower part of the air duct 11); when the device is not in place, the other end of the wind deflector 21 is turned upwards (against its own weight) by the incoming wind from the wind tunnel 11 to block the subsequent incoming wind.

When one end (fixing part) of the wind deflector 21 is arranged on the bottom surface of the air duct 11 (the lower part of the air duct 11), the other end of the wind deflector 21 freely falls under the action of gravity, and a windward part can be arranged at the other end of the wind deflector 21, so that the wind coming from the air duct 11 applies force to the other end of the wind deflector 21, and the other end of the wind deflector 21 rotates upwards.

According to the air duct wind shielding structure 2 provided by the embodiment of the application, the wind shielding plate 21 can rotate to seal the air duct 11 under the action of wind coming from the air duct, so that the incoming wind of the air duct 11 is blocked, and the automatic closing function of the air duct 11 can be realized. Moreover, under the action of the wind from the wind channel 11, the wind shield 21 can be prevented from being accidentally opened reversely due to vibration and the like, and the working reliability of the wind shielding structure 2 of the wind channel is improved.

In an exemplary embodiment, the air duct 11 is an air passage of the apparatus; when the device is in place, the other end of the wind deflector 21 is rotated to a first position against the device, as shown in figures 3 and 4; when the device is not in place, the other end of the air deflector 21 is pivoted to a second position against the base of the device, as shown in figures 5 and 6.

The wind channel wind-shielding structure 2 that sets up can not influence the cooling air of wind channel 11 when normal work and pass through, for example, the fixed part is fixed when wind channel 11 upper wall: when the equipment is in place, the wind deflector 21 is wholly positioned above the equipment, and cooling air can pass between the equipment and the side wall of the air duct 11, so that the equipment in place is cooled normally. The equipment in place can produce the supporting role to the other end of deep bead 21, prevents that deep bead 21 from unexpected rotatory falling under the circumstances of cooling air and self gravity, and can play certain effect of blockking to the incoming wind. When the equipment is not in place, that is, no equipment needing cooling is arranged in the air duct 11, the other end of the wind shield 21 rotates downwards under the action of cooling air and self gravity to seal the air duct 11, so that direct loss of the equipment due to the fact that the cooling air does not dissipate heat is avoided. The air duct wind shielding structure 2 can automatically judge whether the equipment is in place or not, and the wind shielding plate 21 rotates to fall down to seal the air duct 11 when the equipment is not in place, so that manual operation is not needed, and the practicability of the air duct wind shielding structure 2 is improved.

In an exemplary embodiment, the air duct 11 is an air passage of the ram 4, and the installation slot 41 of the ram 4 is disposed below the air duct 11.

The air duct 11 is an overfire air duct of the ram 4, i.e. the aforementioned in-place or out-of-place device may be the ram 4. For example: when the fixed part is fixed on the upper wall of the air duct 11 and the equipment is in place, namely the random access memory 4 is installed in the installation groove 41 below the air duct 11, the random access memory 4 supports the other end of the air baffle 21 to prevent the other end of the air baffle 21 from rotating and falling; when the fixing portion is fixed on the upper wall of the air duct 11 and the device is not in place, that is, the ram 4 is not installed in the installation slot 41, the other end of the wind shield 21 rotates downward under the action of the cooling air and the self gravity, so as to close the air duct 11 and prevent the direct loss of the cooling air originally used for cooling the ram 4. Of course, the mounting slot 41 may be located elsewhere in the air chute 11.

In an exemplary embodiment, as shown in fig. 3 and 5, the length of the air deflector 21 is greater than the height of the air chute 11, and the other end of the air deflector 21, when rotated and pressed against the base of the ram, partially or completely closes the air chute 11.

The length of the wind shield 21 is set to be larger than the height of the wind channel 11, when the wind shield 21 falls down, the lower end of the wind shield 21 can directly abut against the installation groove 41, other limiting structures are not required to be additionally arranged to limit the wind shield 21, the wind channel wind shielding structure 2 is simplified, and the manufacturing cost of the wind channel wind shielding structure 2 is reduced.

In an exemplary embodiment, a limiting structure (not shown) is further disposed in the air duct 11, and the limiting structure limits the air deflector 21 when the other end of the air deflector 21 rotates to the second position.

Except the limit mode of the length of the wind shield 21 being greater than the height of the air duct 11, the mode of arranging a limit structure in the air duct 11 can be adopted to limit the wind shield 21, for example: when the fixing portion is fixed to the upper wall of the duct 11, the wind deflector 21 is restricted (prevented from being excessively rotated) when rotated downward to the vertical position. This way, the length of the wind deflector 21 is shortened, and the material usage of the wind deflector 21 is saved.

When the wind shield 21 completely seals the air duct 11, the waste of cooling air can be reduced to the greatest extent; when the wind shield 21 partially seals the air duct 11, the setting difficulty of the air duct wind shielding structure 2 is reduced: a certain gap can exist between the wind shield 21 and the side wall of the air duct 11, so that friction between the wind shield 21 and the side wall of the air duct 11 is avoided, and the wind shield 21 can flexibly rotate; and is convenient to install.

In an exemplary embodiment, as shown in fig. 3 and 5, the fixing portion is a fixing plate 22, and one end of the wind deflector 21 is hinged to the fixing plate 22 through a rotating shaft 23.

The wind shield 21 is hinged with the fixing plate 22 through the rotating shaft 23, the rotating mode is simple and reliable, the working reliability is high, and the service life of the wind shield structure 2 of the air duct is prolonged. Of course, the fixing portion may be provided in the form of a fixing seat, besides the fixing plate 22, and the wind deflector 21 is hinged to the fixing seat through the rotating shaft 23. The shaft 23 may take the form of a flexible hinge.

In an exemplary embodiment, the fixing portion is a fixing plate 22, and the fixing plate 22 and the wind deflector 21 are flexible plates of an integrated structure, and the flexible plates are bent to form the fixing plate 22 and the wind deflector 21.

Besides the above-mentioned hinge rotation, a mode of "the wind deflector 21 and the fixing plate 22 are integrated" may also be adopted: the middle position of the flexible plate is processed or bent to form a crease, and two sides of the crease are respectively used as a fixing plate 22 and a wind shield 21. The flexible sheet may be a flexible PC plastic sheet.

The embodiment of the application further provides a wind shield, the wind shield is used for being installed in a server to adjust the air distribution inside the server, a plurality of air channels 11 are arranged on the wind shield 1 and serve as air passing channels of equipment, and at least one air channel 11 is provided with the air channel wind shielding structure 2.

The windshield 1 provided by the embodiment of the application is provided with the air duct wind shielding structures 2 in the air ducts 11, and the air duct wind shielding structures 2 in the air ducts 11 are independently arranged and do not affect each other, so that the sealing or opening of the single air duct 11 can be accurately controlled. The windshield 1 can optimize the air volume distribution in the server, improve the heat dissipation efficiency of the fan 3 under the condition of the same air volume, enhance the cooling air volume of equipment with larger heat dissipation capacity, such as the CPU module 5 and the like, reduce the waste condition of the cooling air, and improve the practicability of the windshield 1.

The embodiment of the present application further provides a server, as shown in fig. 2, the server includes a housing, and a fan 3, a random access memory 4, other heat generating devices, and the aforementioned wind shield 1 that are disposed in the housing, where the fan 3 is configured to generate wind flow to cool the random access memory 4 and the other heat generating devices, a plurality of wind channels 11 on the wind shield 1 are used as wind passing channels for the random access memory 4 and the other heat generating devices, and at least one wind channel 11 with a wind channel wind shielding structure 2 is used as a wind passing channel for the random access memory 4.

The fans 3 may be arranged in plurality side by side to form a fan row, thereby generating a uniform, wide range of cooling wind.

When the random access memory 4 in the air duct 11 is not installed, the air duct wind shielding structure 2 in the air duct 11 can seal the air duct 11, so that the cooling air volume of other heating equipment connected in parallel is increased, the direct loss of the cooling air originally used for cooling the random access memory 4 is avoided, the cooling effect of the other heating equipment and the residual random access memory 4 is improved, and the overall performance of the server is further improved.

The server that this application embodiment provided, inside radiating effect is good, can effectively reduce the temperature of other equipment that generate heat, prolongs the life of equipment, guarantees the holistic steady operation of server, has improved the operational reliability of server.

In an exemplary embodiment, the other heat generating devices include a CPU module 5 and an expansion card 6(PCIe expansion card); the CPU module 5 and the RAM 4 are arranged side by side (two CPU modules can be arranged, 8 RAMs are respectively arranged at two sides of each CPU module, and 32 RAMs are arranged in total), the expansion plug-in card 6 is arranged at the rear ends of the RAM 4 and the CPU module 5, and the windshield 1 is arranged above the RAM 4 and the CPU module 5; the fan 3 is provided at the front end of the CPU module 5 and the random access memory 4. The front end of the fan 3 is also provided with 12 3.5-inch hard disks 7.

The air duct 11 of the windshield 1 corresponds to the random access memory 4 and the CPU module 5 respectively, under normal conditions, cooling air generated by the fan 3 enters the air duct 11 of the windshield 1 and cools the random access memory 4 and the CPU module 5 through each air duct 11 respectively, and when part of the random access memory 4 is not installed, the air duct wind shielding structure 2 seals the corresponding air duct, so that the air volume of other air ducts is increased, and the cooling effect on the CPU module 5, the remaining random access memory 4 and the expansion card 6 located at the rear end is improved.

Example two

The embodiment of the application provides an air duct wind shielding structure, the main structure of which is the same as that of the first embodiment, and only the difference between the two is described here.

In an exemplary embodiment, the duct wind-shielding structure further includes a fixing plate 22; the fixing part is a mounting base (not shown in the figure) arranged on the inner wall of the air duct; the wind deflector 21 and the fixing plate 22 are fixedly connected, and the wind deflector 21 and the fixing plate 22 form a rotation shaft at the connection, and the rotation shaft is rotatably installed in the mounting base.

The fixed part is the installation base, and the installation base setting is on wind channel 11 inner wall, and fixed plate 22 and deep bead 21 fixed connection and the two contained angle are unchangeable, and the axis of rotation that fixed plate 22 and deep bead 21 junction formed rotationally installs in the installation base of wind channel inner wall, makes fixed plate 22 and deep bead 21 can rotate as the centre of a circle by axis of rotation (installation base).

When the equipment in the air duct 11 is in place, the other end of the air baffle 21 abuts against the equipment, and at the moment, a certain angle exists between the fixing plate 22 and the inner wall of the air duct 11 (for example, the upper wall of the air duct 11); when the device is not in place, the other end of the wind shield 21 rotates and falls down to seal the air duct 11, the fixing plate 22 rotates along with the wind shield 21, at the moment, the fixing plate 22 is attached to the inner wall (for example, the upper wall of the air duct 11) of the air duct 11, the fixing plate 22 can also play a limiting role to prevent the wind shield 21 from rotating excessively, at the moment, other limiting structures do not need to be additionally arranged, the length of the wind shield 21 does not need to be set to be larger than the height of the air duct 11 to limit, and the working reliability of the wind shield structure of the air duct is improved.

In the description of the present application, it should be noted that the terms "plurality" and "a plurality" refer to two or more, and the directions or positional relationships indicated by "upper", "lower", "one side", "one end", "the other end", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the structures referred to have a specific direction, are configured and operated in a specific direction, and thus, cannot be construed as limiting the present application.

In the description of the embodiments of the present application, unless otherwise expressly specified or limited, the terms "connected" and "mounted" are to be construed broadly, e.g., the terms "connected" and "connected" may be either fixedly or detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiments described herein are exemplary rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.

The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements that have been disclosed in this application may also be combined with any conventional features or elements to form unique aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other aspects to form another unique aspect as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Claims

1. The utility model provides an air duct wind-shielding structure, its characterized in that, including setting up fixed part and deep bead in the air duct, wherein:

2. The air duct wind shielding structure according to claim 1, wherein the air duct is an air passage of an apparatus;

when the equipment is in place, the other end of the wind shield rotates to a first position and abuts against the equipment; when the equipment is not in place, the other end of the wind shield rotates to a second position and abuts against the base of the equipment.

3. The air duct wind shielding structure according to claim 2, wherein the air duct is an air passing channel of the ram, and an installation groove of the ram is arranged below the air duct.

4. The air duct wind-shielding structure according to claim 2, wherein the length of the wind-shielding plate is greater than the height of the air duct, and the other end of the wind-shielding plate partially or completely closes the air duct when rotating and abutting against the base of the device.

5. The wind shielding structure of any one of claims 1 to 4, wherein the fixing portion is a fixing plate, and one end of the wind shielding plate is hinged to the fixing plate through a rotating shaft.

6. The wind shielding structure according to any one of claims 1 to 4, wherein the fixing portion is a fixing plate, and the fixing plate and the wind shielding plate are flexible plates of an integrated structure, and the flexible plates are bent to form the fixing plate and the wind shielding plate.

7. The wind tunnel wind shielding structure according to any one of claims 1 to 4, further comprising a fixing plate; the fixed part is an installation base arranged on the inner wall of the air duct;

the wind shield and the fixing plate are fixedly connected, a rotating shaft is formed at the joint of the wind shield and the fixing plate, and the rotating shaft is rotatably installed in the installation base.

8. The wind deflector of claim 1, wherein a limiting structure is further disposed in the wind tunnel, and when the other end of the wind deflector rotates to the second position, the limiting structure limits the wind deflector.

9. A wind shield for installation in a server to adjust air distribution inside the server, wherein the wind shield is provided with a plurality of wind channels as air passages for the equipment, wherein at least one wind channel is provided with a wind channel wind shielding structure according to any one of claims 1 to 8.

10. A server comprising a housing and a fan disposed within the housing, the fan being configured to generate a flow of air to cool the ram and the other heat generating devices, and a windshield according to claim 9, wherein a plurality of air channels on the windshield serve as air passages for the ram and the other heat generating devices, and wherein at least one air channel with an air channel wind-shielding structure serves as an air passage for the ram.