JP2013079606A - Ventilation facility for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable ventilation facility for a tunnel having little influence on the main function of the ventilation facility by failure of an auxiliary machine, without requiring a power increase in a driving apparatus for rotatingly driving a main exhaust air blower blade.SOLUTION: This ventilation facility for the tunnel includes a main exhaust air blower 102, and includes a cooling fan 7 directly driven by an electric motor 2 for driving the main exhaust air blower blade 5, the electric motor 2 is arranged on the upstream side of the main exhaust air blower blade 5 in an exhaust flow passage 101, the electric motor 2 is covered with an electric motor protective cover 6, an external cooling air introducing port 8 is arranged in an opposite side side part of the main exhaust air blower blade 5 of the electric motor protective cover 6, an external cooling air discharge port 9 is arranged in a side part on the main exhaust air blower blade 5 side, and external cooling air introduced into the electric motor protective cover 6 by passing through an external cooling air introducing duct 10, is discharged in the exhaust flow passage 101.

Description

  The present invention relates to a tunnel ventilation facility suitable as a ventilation facility for a tunnel, particularly a roadway tunnel.

  FIG. 1 is a view for explaining the outline of a conventional tunnel ventilation facility that exhausts air in a conventional tunnel for a roadway. An exhaust passage (ventilation tower) 101 communicates with the tunnel 100 for the roadway, and a main exhaust blower (for example, an axial blower) 102 is disposed in the exhaust passage 101 to start the main exhaust blower 102. Thus, the main exhaust flow (exhaust) 103 attracted by the main exhaust blower 102 is discharged to the outside through the exhaust passage 101. Reference numeral 104 denotes a jet fan installed in a tunnel 100 for a roadway.

  In the tunnel ventilation facility, the capacity of the main exhaust fan 102, which is a ventilation fan, is large because concentrated ventilation is performed. When the capacity of the main exhaust blower 102 is increased, the capacity of a driving machine such as an electric motor to be driven is also increased and the amount of heat generated is increased, so that the driving machine needs to be cooled. Since the main exhaust flow (exhaust gas) attracted from the tunnel 100 contains a large amount of dust, cooling of the drive unit requires fresh air that does not contain dust. In order to obtain the fresh air, conventionally, as shown in FIGS. 2A and 2B, fresh air is forcibly supplied from the outside by a method of providing a dust collector on the suction side of the main exhaust blower 102. Measures such as a method of installing air supply equipment are taken.

JP 2008-307468 A

  However, the method of providing the dust collector on the suction side of the main exhaust blower 102 is difficult to completely remove dust with the dust collector. When the dust removal rate is increased, the fluid pressure loss increases, and the main exhaust blower provided on the downstream side There is a problem of affecting the stable operation of 102. Moreover, it is necessary to add performance for compensating for the fluid pressure loss to the main exhaust blower 102, and increasing the power of the drive unit for rotationally driving the main exhaust blower blades becomes an economic issue.

  2 (a) is provided with an air supply fan 1, and the air supply fan 1 forcibly cools the external cooling air 107 for cooling through the outside air introduction duct 105 in the casing 3 of the main exhaust blower 102. Then, the external cooling air 107 after cooling the electric motor 2 and the like in the casing 3 is exhausted to the outside through the exhaust duct 106. The configuration in which factors (cooling and the like) that affect the operation of the main exhaust fan 102 are left to the supply fan 1 that is an auxiliary device requires extra power, and the failure of the auxiliary device causes the main exhaust fan 102 to fail. In order to cause malfunctions and shutdowns, the increase in the number of devices that affect the main function of the ventilation facility increases the probability of failure and decreases reliability.

  The ventilation facility shown in FIG. 2B is provided with an external fan 4 driven by the electric motor 2 of the main exhaust blower 102, and a ventilation fan chamber (not shown) and an exhaust passage 101 are connected to the duct 110. By connecting the duct 111 and rotating the fan 4 outside the motor, the air 112 in the ventilation fan chamber is guided into the casing 3 through the duct 110, the motor 2 and the like in the casing 3 are cooled, and the cooled air 112 is ducted. It is the structure which returns to the ventilation fan room through 111. Since this method raises the room temperature of the ventilation fan room, there is a problem that air conditioning equipment for the ventilation fan room is required.

  The present invention has been made in view of the above points, and it is not necessary to increase the power of a driving device for rotationally driving the main exhaust blower blades, and it is less likely to affect the main function of the ventilation facility due to an accessory failure. The purpose is to provide a highly ventilated tunnel facility.

  In order to solve the above-described problems, the present invention is a tunnel ventilation facility that includes a main exhaust fan and ventilates the tunnel, and is a cooling fan that is directly driven by a drive unit that drives the main exhaust fan blades. The drive unit is installed upstream of the main exhaust blower blade in the exhaust passage through which the main exhaust flow attracted by the main exhaust blower blade passes, and the drive unit is isolated from the main exhaust flow An external cooling air introduction port is provided on the side opposite to the main exhaust blower blade side of the drive device protection cover, and external cooling air is introduced into the external cooling air introduction port. An air introduction duct is connected, and the external cooling air introduced into the drive machine protection cover through the external cooling air introduction duct on the side of the main exhaust blower blade side of the drive machine protection cover is externally supplied. Characterized by providing external cooling air outlet for releasing by utilizing a pressure difference of the exhaust passage to the exhaust passage.

  By constructing the tunnel ventilation equipment as described above, the fresh external cooling air introduced into the driving machine protective cover through the external cooling air introduction duct is attracted by the main exhaust blower blade after cooling the driving machine. Since it is discharged into the exhaust flow path through which the main exhaust flow passes, the drive unit can be completely protected from dust and dust in the tunnel.

  In addition, since the external cooling air introduced into the drive protection cover is discharged from the external cooling air discharge port into the exhaust flow path, it is installed upstream of the main exhaust blower blades by the operation of the main exhaust blower. The external cooling air outlet opening has a negative pressure, and suction force acts on the external cooling air in the drive unit protection cover. The external cooling air after cooling the drive unit enters the exhaust flow path without installing special equipment. It becomes possible to release (discharge). Further, the suction force (cooling ventilation force) that is insufficient due to the intake air by the negative pressure can be compensated by the cooling fan that is directly driven by the drive unit.

  In addition, since the external cooling air after cooling the drive unit is discharged into the exhaust passage, the external cooling air joins the main exhaust flow blown by the main exhaust blower and is discharged. An exhaust duct for exhausting air is not necessary.

  Further, the present invention provides the above-described tunnel ventilation equipment, wherein the main exhaust blower is installed upright in the exhaust flow path, and is installed so that the main exhaust flow flows from the ground side to the top side. The cooling air introduction port is arranged on the ground side and the external cooling air discharge port is arranged on the top side.

  By configuring the tunnel ventilation facility as described above, the external cooling air warmed by cooling the drive unit flows toward the top (upward) due to the draft effect, so the external cooling air cools the drive unit. It flows toward the external cooling air discharge port on the top side.

  Further, the present invention provides the above tunnel ventilation equipment, wherein the cross section of the drive unit protection cover perpendicular to the main exhaust flow direction of the exhaust passage is circular, and the external cooling air inlet is connected to the drive unit protection cover It arrange | positions on the tangent of circular cross section, and gives a turning force to the said external cooling air which flows in from the said external cooling air inlet.

  As described above, the external cooling air introduction port is arranged on the tangent of the cross section of the driving machine protective cover, and the configuration is such that a turning force is applied to the external cooling air flowing from the external cooling air introduction port. The local cooling can be eliminated and the cooling can be performed uniformly, and the time for the external cooling air to contact the drive unit becomes longer.

  Further, the present invention is characterized in that, in the tunnel ventilation facility, the external cooling air discharge port of the driving machine protective cover is provided inclined at a predetermined angle θ (θ <90 °) toward the main exhaust fan blade. To do.

  As described above, the external cooling air discharge port of the drive unit protective cover is inclined at a predetermined angle θ (θ <90 °) toward the main exhaust blower blade, so that the external cooling air discharged from the external cooling air discharge port The flow is in the same direction as the main exhaust air flow by the main exhaust air blower, so that the back flow from the main exhaust air flow can be prevented and the ejector effect can be improved. Further, since the external cooling air is an upward flow that is taken in from the lower part of the drive protection cover and also uses the draft effect, it contributes to the efficient discharge of the upward flow to the outside.

  In addition, the present invention is a tunnel ventilation facility that includes a main exhaust fan and ventilates the tunnel, and includes a cooling fan that is directly driven by a drive unit that drives the main exhaust fan blade, and the main exhaust fan blade A blade angle control device for controlling the blade angle of the main exhaust blower blade in the exhaust passage through which the main exhaust flow attracted from the main exhaust blower blade passes, A drive for isolating the drive unit from the main exhaust flow by installing a blade angle control device upstream of the main exhaust blower blade in an exhaust passage through which the main exhaust flow attracted from the main exhaust blower blade passes. An external cooling air introduction duct that is covered with a machine protection cover and has an external cooling air introduction port on the side opposite to the main exhaust blower blade side of the drive machine protection cover and introduces external cooling air to the external cooling air introduction port Connect and said An external cooling air discharge port for exhausting the external cooling air introduced into the driver protection cover through the external cooling air introduction duct is provided on the side of the exhaust blower blade, and connected to the external cooling air discharge port An exhaust port of the exhaust duct is disposed on the upstream side of the main exhaust blower blade in the exhaust flow path, and a reverse swirl flow that prevents a reverse swirl flow from the main exhaust blower blade at the exhaust port of the exhaust duct. A prevention plate is provided.

  As described above, the exhaust port of the exhaust duct connected to the external cooling air discharge port of the drive unit protection cover is disposed on the upstream side of the main exhaust blower blade in the exhaust flow path, and the exhaust port of the exhaust duct includes: By providing a backflow swirl flow prevention plate that prevents backflow swirl flow from the main exhaust blower blades, even if the main exhaust blower is a specially structured blower with blade angle control device, it has an attractive effect due to negative pressure and airflow It can be used efficiently.

  In addition, the present invention is a tunnel ventilation facility that includes a main exhaust fan and ventilates the tunnel, and includes a cooling fan that is directly driven by a drive unit that drives the main exhaust fan blade, and the main exhaust fan blade A blade angle control device for controlling the blade angle of the main exhaust fan blades, and the drive unit is installed on the downstream side of the main exhaust fan blades in the exhaust passage through which the main exhaust flow induced by the main exhaust fan blades passes. The drive unit is covered with a drive unit protective cover for isolating from the main exhaust flow, an external cooling air inlet is provided on the side opposite to the main exhaust blower blade of the drive unit protection cover, and the external cooling air An external cooling air introduction duct is connected to the introduction port, and the external cooling air introduced into the driver protection cover through the external cooling air introduction duct on the side of the main exhaust blower blade is discharged into the flow path. Outside Flow of external cooling air discharged cooling air outlet from the external cooling air outlet is characterized by providing in parallel the main exhaust stream flow and substantially being attracted from said main exhaust fan blades.

  As described above, the drive unit is installed on the downstream side of the main exhaust fan blade in the exhaust flow path, the external cooling air inlet is provided on the main exhaust fan blade side of the drive protection cover, and the main exhaust fan blade side Provided so that the flow of the external cooling air discharged from the external cooling air discharge port is substantially parallel to the main exhaust flow in the exhaust passage, so that the external cooling air discharge port is connected to the downstream side of the main exhaust blower blade. However, since the main exhaust flow has a high flow velocity, the exhaust passage has a negative pressure, and the external cooling air after cooling is efficiently discharged into the exhaust passage due to the ejector effect.

The present invention includes a cooling fan that is directly driven by a drive device that drives a main exhaust fan blade, the drive device is installed on the upstream side of the main exhaust fan blade in the exhaust flow path, and the drive device is a protective cover for the drive device By providing an external cooling air discharge port for discharging the external cooling air introduced into the drive unit protective cover through the external cooling air introduction duct into the exhaust passage, the following effects can be obtained. It is done.
-The drive unit that drives the main exhaust fan blades can be completely protected from dust and dust in the tunnel, and a highly reliable tunnel ventilation system can be provided.
-By operating the main exhaust blower, the inside of the exhaust passage where the external cooling air discharge port is installed has a negative pressure, and the external cooling air is sucked by this negative pressure, so that it becomes an economical tunnel ventilation facility.
-In addition, it is necessary to install a separate air supply fan that was necessary in the past by compensating for the suction power (cooling ventilation power) that is insufficient due to negative pressure intake by cooling fans that are directly driven by the drive unit. This is a tunnel ventilation facility with a reduced failure rate, economy, and improved maintainability (reduced management equipment).
・ Also, the external cooling air after cooling the drive unit is combined with the main exhaust flow in the exhaust flow path and discharged, eliminating the need for an exhaust duct for exhausting the external cooling air. A simplified, economical and reliable tunnel ventilation system.

  Further, according to the present invention, the main exhaust blower is installed vertically in the exhaust flow path, and the drive unit protection cover is positioned so that the external cooling air introduction port is located on the ground side and the external cooling air discharge port is located on the top side. By arranging it, it becomes a more economical and efficient tunnel ventilation equipment.

  Further, according to the present invention, the external cooling air introduction port is arranged on the tangent line of the cross section of the driving machine protection cover, and the structure is configured to give a turning force to the external cooling air flowing from the external cooling air introduction port. The local cooling of the driving machine can be eliminated and the cooling can be performed uniformly, and the time for the external cooling air to contact the driving machine becomes longer, so that the tunnel ventilation equipment can efficiently cool the driving machine.

  In addition, according to the present invention, the external cooling air discharge port of the drive unit protection cover is inclined at a predetermined angle θ (θ <90 °) toward the main exhaust air blower blade, so that it is discharged from the external cooling air discharge port. The flow of the external cooling air is in the same direction as the main exhaust airflow by the main exhaust air blower, and it becomes a tunnel ventilation facility that can prevent the backflow from the main exhaust airflow and increase the ejector effect. Further, since the external cooling air is an upward flow that is taken in from the lower part of the drive protection cover and also uses the draft effect, it becomes a tunnel ventilation facility that contributes to the efficient discharge of the upward flow to the outside.

  Further, according to the present invention, the exhaust port of the exhaust duct connected to the external cooling air discharge port of the drive unit protection cover is disposed on the upstream side of the main exhaust fan blade in the exhaust flow path, and the exhaust port includes By providing a backflow swirl flow prevention plate that prevents backflow swirl flow from the main exhaust blower blade, even if the main exhaust blower is a specially structured blower with blade angle control device, the attraction effect by negative pressure and air flow It is an efficient and reliable tunnel ventilation system that efficiently utilizes

  Further, according to the present invention, the drive unit is installed on the downstream side of the main exhaust fan blade in the exhaust flow path, and the external cooling air introduction port is provided on the opposite side portion of the main exhaust fan blade of the drive unit protection cover, The external cooling air discharge port is provided on the side of the main exhaust blower blade side so that the flow of the external cooling air discharged from the external cooling air discharge port is substantially parallel to the exhaust flow in the exhaust flow path. Although it is on the downstream side of the blade, the main exhaust flow has a high flow velocity, so the inside of the exhaust passage becomes negative pressure, and the external cooling air after cooling can be efficiently discharged into the exhaust passage due to the ejector effect, An economical and reliable tunnel ventilation system.

It is a figure which shows schematic structure of the ventilation equipment for tunnels which ventilates in the tunnel for conventional roadways. It is a figure which shows the schematic structural example of the conventional ventilation equipment for tunnels. It is a figure which shows the schematic structural example of the ventilation equipment for tunnels which concerns on this invention. It is a figure which shows the other schematic structural example of the ventilation equipment for tunnels which concerns on this invention. It is a figure which shows the other schematic structural example of the ventilation equipment for tunnels which concerns on this invention. It is a figure which shows the other schematic structural example of the ventilation equipment for tunnels which concerns on this invention. It is a figure which shows the other schematic structural example of the ventilation equipment for tunnels which concerns on this invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail. In this embodiment, a tunnel ventilation facility that exhausts air in a tunnel for roadways will be described as an example. However, the tunnel ventilation facility according to the present invention is not limited to a tunnel for roadways, but for other trains and the like. It can also be used as a ventilation facility. In the present embodiment, the motor 2 drives the main exhaust blower 102. However, the motor 2 is not limited to the motor as long as the main exhaust blower 102 can be driven. A driving machine such as a gas turbine or an engine may be used. FIG. 3 is a diagram showing a schematic configuration of a tunnel ventilation facility according to the present invention (the invention according to claims 1 to 3). In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts. The same applies to other drawings.

  As shown in FIG. 3 (a), the ventilation equipment for a tunnel is provided with a main exhaust flow 103 communicating with the tunnel 100 (see FIG. 1) in an exhaust passage (ventilation tower) 101 that flows from the ground side to the top side. An exhaust fan 102 is installed in a standing position. The main exhaust blower 102 includes a main exhaust blower blade 5 and an electric motor 2 that drives the main exhaust blower blade 5, and the electric motor 2 is disposed on the upstream side of the main exhaust flow 103 from the main exhaust blower blade 5 in the exhaust passage 101. ing. The electric motor 2 is covered with an electric motor protective cover 6 for isolating it from the main exhaust flow 103 containing dust and dust. A cooling fan 7 provided at the shaft end of the electric motor 2 and directly driven by the electric motor 2 is disposed in the electric motor protection cover 6.

  An external cooling air introduction port 8 is provided on the side opposite to the main exhaust blower blade 5 side of the motor protection cover 6, and an external cooling air introduction duct 10 for introducing external cooling air is connected to the external cooling air introduction port 8. Yes. Further, an external cooling air discharge port 9 that discharges external cooling air into the exhaust passage 101 after cooling the electric motor 2 in the electric motor protection cover 6 is provided at the side of the electric motor protection cover 6 on the main exhaust blower blade 5 side. It has been. The external cooling air introduced into the motor protection cover 6 by the external cooling air introduction duct 10 cools the motor 2 and is then discharged from the external cooling air discharge port 9 into the main exhaust blower 102.

  By providing the external cooling air discharge port 9 in the vicinity of the axial end of the electric motor 2 in the region A where the negative pressure on the upstream side of the main exhaust blower blade 5 is provided, when the main exhaust blower blade 5 is rotated by the operation of the main exhaust blower 102, A region A on the upstream side of the main exhaust fan blade 5 has a negative pressure. After the external cooling air 107 is introduced into the motor protection cover 6 through the external cooling air introduction duct 10 using the pressure difference between the pressure in the region A and the external pressure (atmospheric pressure), the motor 2 is cooled. The warm external cooling air 107 is guided into the main exhaust blower 102 from the external cooling air discharge port 9. Thereby, it can be set as the efficient (economic) tunnel ventilation equipment.

  Further, the suction force (cooling ventilation force) that is insufficient due to the intake air due to the negative pressure in the region A is compensated by a small cooling fan 7 provided at the shaft end of the electric motor 2, as shown in FIG. The separate air supply fan 1 that is necessary for the tunnel ventilation facility is no longer necessary, and the tunnel ventilation facility is improved (reducing the management equipment) with reduced failure rate, economy, and maintenance. Further, since the external cooling air after cooling of the electric motor 2 is discharged into the exhaust passage 101, an exhaust duct for exhausting the cooling air is not required, and the tunnel ventilation equipment with a simplified structure is obtained.

  Further, as described above, the exhaust flow passage 101 in the portion where the main exhaust blower 102 is disposed is installed so that the main exhaust flow 103 flows from the ground side to the top side, and the main exhaust blower 102 is set up in the exhaust flow passage 101. The electric motor protective cover 6 was placed such that the external cooling air inlet 8 was on the ground side and the external cooling air outlet 9 was on the top side. As a result, the external cooling air 107 warmed by cooling the motor 2 flows toward the top (upward) due to the draft effect, so that the external cooling air 107 flows into the external cooling air discharge port 9 while cooling the motor 2. It will flow efficiently towards you.

  Further, in the tunnel ventilation equipment, the cross section orthogonal to the flow direction of the main exhaust flow 103 of the exhaust passage 101 of the motor protection cover 6 is circular as shown in FIG. The mouth 8 is disposed on the tangent of the motor protective cover 6 with a circular cross section. As a result, a turning force is applied to the external cooling air 107 flowing from the external cooling air introduction port 8 to form a swirling flow, so that the local cooling of the electric motor 2 is eliminated and the cooling can be performed uniformly. In addition, the time during which the external cooling air 107 is in contact with the outer wall surface of the electric motor 2 becomes longer, and the electric motor 2 is efficiently cooled.

  In the tunnel ventilation facility, as shown in FIG. 4C, the external cooling air discharge port 9 of the motor protection cover 6 is inclined at a predetermined angle θ (θ <90 °) toward the main exhaust blower blade 5. Provided. As described above, the external cooling air discharge port of the motor protection cover 6 is inclined at a predetermined angle θ (θ <90 °) toward the main exhaust blower blade 5 to thereby provide external cooling discharged from the external cooling air discharge port 9. The flow of the air 107 is in the same direction as the main exhaust flow 103 by the main exhaust blower 102, so that the back flow from the main exhaust flow 103 can be prevented and the ejector effect can be improved. Further, since the external cooling air 107 is an upward flow that takes in from the lower part of the motor protection cover 6 and also uses the draft effect, it contributes to the efficient discharge of the upward flow to the outside, and is a comprehensively efficient tunnel. Ventilation equipment.

  Further, when the cooling fan 7 of the external cooling air discharge port 9 of the motor protection cover 6 is stopped, the main exhaust flow 103 in the exhaust passage 101 does not flow into the motor protection cover 6 as shown in FIG. ) As shown in FIG. 4A is a diagram showing a schematic configuration of a tunnel ventilation facility according to the present invention (the invention described in claim 4), and FIGS. 4B and 4C are respectively diagrams of FIG. It is an enlarged view of C part.

  FIG. 5 is a diagram showing a schematic configuration of a tunnel ventilation facility according to the present invention (the invention according to claim 5). This tunnel ventilation facility includes a cooling fan 7 that is directly driven by an electric motor 2 that drives a main exhaust fan blade 5, and a blade angle control device 12 that controls the blade angle of the main exhaust fan blade 5. The electric motor 2 is installed on the downstream side of the main exhaust fan blade 5 in the exhaust passage 101, the outer periphery is covered with the motor protective cover 6, and external cooling air is provided on the opposite side of the motor protective cover 6 to the main exhaust fan blade 5 side. An introduction port 8 is provided. Then, an external cooling air introduction duct 10 for introducing external cooling air is connected to the external cooling air introduction port 8 and introduced into the motor protective cover 6 through the external cooling air introduction duct 10 on the side of the main exhaust blower blade 5 side. An external cooling air discharge port 9 for exhausting the external cooling air 107 is provided.

  An exhaust port of the exhaust duct 15 connected to the external cooling air discharge port 9 is disposed on the upstream side of the main exhaust blower blade 5 in the exhaust passage 101. As shown in FIG. 5 (b), a backflow swirl flow prevention plate 17 for preventing a backflow swirl flow from the main exhaust blower blade 5 is provided at the exhaust port of the exhaust duct 15. FIG. 5B is a cross-sectional view taken along the line AA in FIG. 5A (enlarged region D). As described above, the exhaust port 18 of the exhaust duct 15 connected to the external cooling air discharge port 9 of the motor protection cover 6 is opened at the upstream side of the main exhaust blower blade 5 in the exhaust passage 101, and By providing the backflow swirl flow prevention plate 17, even when the main exhaust fan 102 is a fan having a special structure with a blade angle control device, the negative pressure generated in the region A and the attraction effect due to the airflow are efficiently used. It becomes possible to do.

  As shown in FIG. 5 (b), the backflow swirl flow prevention plate 17 is provided with a bent portion so as to cover the exhaust port 18, but it may be constituted by a simple plate without providing the bent portion. . In the above example, one exhaust port 18 is used, but a plurality of exhaust ports 18 may be used in consideration of the fluid balance with the main exhaust flow 103 flowing in the exhaust passage 101.

  FIG. 5C is an enlarged view of a portion E in FIG. 5A, and represents a cross section of the flow state of the main exhaust flow 103. It also contains a horizontal swirl component due to.

  In a main exhaust blower for a roadway tunnel, discharge amount control may be performed in view of traffic volume and the like. As a method of controlling the discharge amount, there is a case where blade angle control for controlling the fan blade angle is performed. In the case of the current blade angle control method, a hydraulic device is used as the blade angle control device 12, but in such a case, the influence of oil leakage from the blade angle control device 12 (failure due to outflow to a drive machine, In order to minimize external scattering, etc., the blade angle control device 12 which is a hydraulic device is installed below the main exhaust blower blade 5, and even if oil leakage should occur, the oil provided in the lower portion A method of storing oil leaked in the reservoir is used.

  In the system in which the blade angle control device 12 that is a hydraulic device is installed below the main exhaust blower blade 5 as described above and the leaked oil is stored in the lower oil reservoir, the electric motor 2 is connected to the main flow passage in the exhaust passage 101. Since it cannot be installed on the upstream side of the exhaust fan blade 5, an exhaust duct 15 is provided as shown in FIG. 5A, and the exhaust port 18 for discharging the external cooling air 107 is installed on the upstream side of the main exhaust fan blade 5. By adopting the configuration, the cooling device for cooling the electric motor 2 is simplified. However, in such a configuration, the exhaust duct 15 that discharges the external cooling air 107 is located outside the main exhaust blower 102, and therefore, the inlet backflow (swirl flow) generated in the main exhaust blower blade 5 is affected. In some cases, the negative pressure flow is not efficiently sucked.

  In such a case, as shown in FIG. 5B, a backflow swirl flow prevention plate 17 is provided at the exhaust port 18. Thus, the same effect as in the first to fourth aspects of the invention can be obtained.

  FIG. 6 is a diagram showing a schematic configuration of a tunnel ventilation facility according to the present invention (the invention according to claim 6). This tunnel ventilation equipment includes a cooling fan 7 that is directly driven by an electric motor 2 that drives a main exhaust blower blade 5, and a blade angle control device 12 that is a hydraulic control device that controls the blade angle of the main exhaust blower blade 5. It has. Motor protection for isolating the motor 2 from the main exhaust flow 103 by installing the motor 2 downstream of the main exhaust blower blade 5 in the exhaust flow path 101 through which the main exhaust flow 103 attracted by the main exhaust blower blade 5 passes Covered with a cover 6.

  As described above, the external cooling air introduction port 8 is provided on the side opposite to the main exhaust blower blade 5 of the motor protection cover 6, the external cooling air introduction duct 10 is connected to the external cooling air introduction port 8, and the main exhaust An external cooling air discharge port 9 through which the external cooling air 107 that has flowed into the motor protection cover 6 through the external cooling air introduction duct 10 and discharged into the exhaust passage 101 is provided on the side opposite to the blower blade 5. The external cooling air discharge port 9 is provided so that the flow of the discharged external cooling air 107 is substantially parallel to the flow of the main exhaust flow 103 flowing in the exhaust passage 101.

  With the above-described configuration, the external cooling air discharge port 9 is on the downstream side of the main exhaust blower blade 5, but in the main exhaust blower 102 of the roadway tunnel, generally the pressure loss on the downstream side of the main exhaust blower blade 5 Since the main exhaust flow 103 under the region is small and the flow velocity of the main exhaust flow 103 is high (= high dynamic pressure), the static pressure in the region F where the external cooling air discharge port 9 of the exhaust passage 101 is open is negative. If only the opening is provided facing the exhaust passage 101, the external cooling air 107 after cooling in the motor protection cover 6 can be discharged into the exhaust passage 101. A wire mesh may be provided at the external cooling air discharge port 9 that is an opening.

  FIG. 7 is a diagram showing another schematic configuration of a tunnel ventilation facility according to the present invention (the invention according to claim 6). The tunnel ventilation facility shown in FIG. 7 is different from the tunnel ventilation facility shown in FIG. 6 in that the external cooling air introduction port 8 is positioned upstream of the main exhaust air flow 103 from the external cooling air discharge port 9 in FIG. On the other hand, in FIG. 7, the external cooling air introduction port 8 is positioned downstream of the main exhaust flow 103 from the external cooling air discharge port 9, that is, the external cooling air introduction port 8 and the external cooling air discharge port 9. 6 and 7 are the opposite positions. With this configuration, in the tunnel ventilation facility of FIG. 7, as in the tunnel ventilation facility of FIG. 6, the static pressure in the opening region of the external cooling air discharge port 9 becomes a negative pressure, so that a large draft is obtained. Although no effect can be expected, a certain degree of draft effect can be expected.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or structure not directly described in the specification and drawings is within the technical scope of the present invention as long as the effects of the present invention are achieved.

  The present invention includes a cooling fan that is directly driven by an electric motor that drives a main exhaust fan blade, the electric motor is installed upstream of the main exhaust fan blade in the exhaust passage, the electric motor is covered with a motor protective cover, By providing an external cooling air discharge port that discharges the external cooling air introduced into the motor protective cover through the cooling air introduction duct into the exhaust passage, the electric motor that drives the main exhaust fan blades is provided in the tunnel. It can be completely protected from dust and dust and can be used as a reliable tunnel ventilation facility.

  Also, by operating the main exhaust blower, the inside of the exhaust passage where the external cooling air discharge port opens becomes negative pressure, and the external cooling air is sucked by this negative pressure. It is economical because there is no need to install a separate device, and it can be used as a ventilation facility for tunnels with reduced failure rate, improved economy, and improved maintainability (reduced management devices).

  In addition, since the external cooling air after cooling the motor is combined with the main exhaust flow in the exhaust flow path and discharged, an exhaust duct for exhausting the external cooling air becomes unnecessary, and the structure of the tunnel ventilation facility is simplified. This makes the tunnel ventilation equipment economical and reliable.

DESCRIPTION OF SYMBOLS 2 Electric motor 5 Main exhaust fan blade 6 Motor protection cover 7 Cooling fan 8 External cooling air introduction port 9 External cooling air discharge port 10 External cooling air introduction duct 12 Blade angle control device 15 Exhaust duct 17 Backflow swirl flow prevention plate 18 Exhaust port 100 Tunnel 101 Exhaust flow path (ventilation tower)
102 Main exhaust fan 103 Main exhaust flow 107 External cooling air

Claims (6)

A tunnel ventilation facility equipped with a main exhaust fan and ventilating inside the tunnel,
It has a cooling fan that is directly driven by a drive that drives the main exhaust fan blades,
The drive is installed upstream of the main exhaust blower blade in the exhaust passage through which the main exhaust flow attracted by the main exhaust blower blade passes, and the drive is isolated from the main exhaust flow Cover with machine protective cover,
An external cooling air introduction port is provided on the side opposite to the main exhaust blower blade side of the driving machine protective cover, and an external cooling air introduction duct for introducing external cooling air is connected to the external cooling air introduction port. The external cooling air introduced into the driver protection cover through the external cooling air introduction duct on the side of the main exhaust blower blade side of the machine protection cover is utilized using the pressure difference between the outside and the exhaust flow path. A tunnel ventilation facility characterized in that an external cooling air discharge port is provided in the exhaust passage. In the tunnel ventilation equipment according to claim 1,
The main exhaust blower is installed upright in the exhaust flow path, the main exhaust flow is installed so as to flow from the ground side to the top side, and the driver protection cover is placed on the ground side with the external cooling air introduction port A tunnel ventilation system, wherein the external cooling air discharge port is disposed on the top side. In the tunnel ventilation equipment according to claim 1 or 2,
The cross section perpendicular to the main exhaust flow direction of the exhaust flow path of the drive machine protection cover is circular, and the external cooling air inlet is disposed on a tangent of the cross section of the drive machine protection cover,
A tunnel ventilation facility characterized in that a turning force is applied to the external cooling air flowing from the external cooling air introduction port. The tunnel ventilation equipment according to any one of claims 1 to 3,
A tunnel ventilating facility characterized in that the external cooling air discharge port of the driving machine protective cover is provided to be inclined at a predetermined angle θ (θ <90 °) toward the main exhaust fan blade. A tunnel ventilation facility equipped with a main exhaust fan and ventilating inside the tunnel,
A cooling fan that is directly driven by a drive that drives the main exhaust fan blades;
A blade angle control device for controlling the blade angle of the main exhaust fan blade,
The drive unit is installed downstream of the main exhaust fan blade in the exhaust passage through which the main exhaust flow is attracted from the main exhaust fan blade, and the blade angle control device is attracted from the main exhaust fan blade. Installed upstream of the main exhaust fan blades in the exhaust flow path through which the main exhaust flow passes,
Covering with a drive protection cover for isolating the drive from the main exhaust flow;
An external cooling air introduction port is provided on the side opposite to the main exhaust blower blade side of the driver protection cover, and an external cooling air introduction duct for introducing external cooling air is connected to the external cooling air introduction port, An external cooling air discharge port for exhausting the external cooling air introduced into the driver protection cover through the external cooling air introduction duct on the side of the exhaust fan blade side is provided,
An exhaust port of an exhaust duct connected to the external cooling air discharge port is disposed on the upstream side of the main exhaust blower blade in the exhaust flow path, and an exhaust port of the exhaust duct is connected to the main exhaust blower blade. A ventilating facility for tunnels, which is provided with a backflow swirl prevention plate for preventing backflow swirl flow. A tunnel ventilation facility equipped with a main exhaust fan and ventilating inside the tunnel,
A cooling fan that is directly driven by a drive that drives the main exhaust fan blades;
A blade angle control device for controlling the blade angle of the main exhaust fan blade,
A drive for installing the drive unit downstream of the main exhaust blower blade in an exhaust passage through which a main exhaust flow attracted by the main exhaust blower blade passes and isolating the drive unit from the main exhaust flow Cover with machine protective cover,
An external cooling air introduction port is provided on the side of the main exhaust blower blade side of the driving machine protection cover, and an external cooling air introduction duct is connected to the external cooling air introduction port, and on the opposite side portion of the main exhaust blower blade. External cooling air discharged from the external cooling air discharge port through an external cooling air discharge port that discharges the external cooling air introduced into the driver protection cover through the external cooling air introduction duct into the flow path. A ventilation system for tunnels, characterized in that the flow of air is provided so as to be substantially parallel to the flow of the main exhaust flow attracted by the main exhaust blower blades.

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