EP4102028A1 - Ventilation system for road tunnels - Google Patents
Ventilation system for road tunnels Download PDFInfo
- Publication number
- EP4102028A1 EP4102028A1 EP22176519.1A EP22176519A EP4102028A1 EP 4102028 A1 EP4102028 A1 EP 4102028A1 EP 22176519 A EP22176519 A EP 22176519A EP 4102028 A1 EP4102028 A1 EP 4102028A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power supply
- fan
- actuation apparatus
- ventilation system
- switching unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/003—Ventilation of traffic tunnels
Definitions
- the present invention relates to a ventilation system for road tunnels.
- ventilation systems for tunnels comprise speed variators which must be installed in the vicinity of the fans.
- the level of the characteristics of resistance and reaction to fire of the components of all the plants and systems of the tunnel must take account of their structuring and degree of exposure to fire and of technological possibilities, and it must make it possible to maintain the necessary safety functions in the event of fire.
- the aim of the present invention is to provide a ventilation system for road tunnels that is capable of solving the above mentioned problems and overcoming the above mentioned limitations of the background art.
- an object of the present invention is to provide a ventilation system for road tunnels that is capable of ensuring greater reliability in the event of fire.
- Another object of the invention consists of providing a ventilation system for road tunnels that is capable of reducing consumption and the absorbed power.
- Another object of the invention consists of providing a ventilation system for road tunnels that is easy to implement and economically competitive.
- the ventilation system for road tunnels comprises at least one fan 90 which is adapted to be arranged, in a known manner, inside the tunnel.
- the fan 90 is a fan adapted for the ventilation of road tunnels and comprises, in a known manner, at least one symmetrically- or asymmetrically-bladed impeller (preferably made of stainless steel) and an electric motor that rotates the impeller.
- the fan 90 also comprises: a fan housing made of stainless sheet steel, a supporting base for the motor, a rigid suspension system, a horizontal level sensor, and a vibration sensor.
- the ventilation system 1 also comprises a power supply and actuation apparatus 10 which electrically powers the fan 90, and this power supply and actuation apparatus 10 is connected to an electric power supply line 41.
- This power supply and actuation apparatus 10 comprises an electronic control system which is configured to control the speed and the direction of rotation of the fan 90.
- This electronic control system in turn comprises an electrical conversion device 30 (such as an inverter) and optionally also an electric switching unit 31, interposed between the power supply line 41 and the fan 90.
- an electrical conversion device 30 such as an inverter
- an electric switching unit 31 interposed between the power supply line 41 and the fan 90.
- the electrical conversion device 30 varies the frequency and/or the amplitude of the electric current in order to actuate and vary the speed of the fan 90.
- the ventilation system 1 comprises at least one temperature detection device which is positioned in the power supply and actuation apparatus 10 and/or in, or proximately to, the fan 90.
- the power supply and actuation apparatus 10 comprises a motorized switching unit 20 which is configured to modify, as a function of the temperature detected by the above mentioned temperature detection device, the configuration of the power supply and actuation apparatus 10 from an ordinary configuration to an emergency configuration, and vice versa.
- the power supply and actuation apparatus 10 powers the fan 90 by means of the electrical conversion device 30 (inverter).
- the motorized switching unit 20 isolates the electrical conversion device 30, creating (inside the motorized switching unit 20 itself) an electrical bypass so as to supply power directly to the fan 90 from the electrical line 41.
- the electrical bypass is thermally isolated so as to withstand temperatures higher than 400°C for at least two hours.
- Figure 1 shows the diagram of the power section of the preferred embodiment of the power supply and actuation apparatus 10.
- the motorized switching unit 20 is contained inside a textile protection made of mineral wool, or the motorized switching unit 20 itself is configured (using conventional techniques) to withstand a temperature of 400°C for at least two hours.
- bypass can operate under load at the rated current, at a temperature of 400°C and for a minimum length of time of 2 hours.
- the motorized switching unit 20 further makes it possible to actuate the fan 90 in both directions of rotation.
- the power supply and actuation apparatus 10 is accommodated inside a box-like body 11 made of sheet metal 11 (preferably stainless steel) provided with a thermal insulation layer (inside the sheet metal).
- sheet metal 11 preferably stainless steel
- thermal insulation layer inside the sheet metal
- the box-like body of sheet metal 11 is a stainless steel structure and its dimensions are 800mm x 1400mm x 450mm, but the dimensions can vary depending on the power installed and/or on the dimensions of the elements installed inside.
- a temperature detection device which is positioned proximately to the fan 90 in order to detect the temperature proximate to such fan 90 and which is functionally connected to the electronic control system, so that if the temperature at which the fan 90 operates exceeds a threshold value (for example 55-60°C) the electronic control system induces, by way of the motorized switching unit 20, the switchover to the emergency configuration.
- a threshold value for example 55-60°C
- an emergency command is sent remotely to the power supply and actuation apparatus 10, and the latter, by means of the motorized switching unit 20, performs the switchover from ordinary configuration (actuation by inverter) to emergency configuration (bypass).
- the emergency command is also associated with a command governing the direction of rotation of the fan 90.
- the power supply and actuation apparatus 10 also comprises a thermostat, which comprises a respective temperature detection device inside the box-like body 11, which is configured to actuate the motorized switching unit 20 in order to provide the emergency configuration when the detected temperature is equal to or higher than a threshold temperature (preferably 55-60°C).
- a threshold temperature preferably 55-60°C.
- the direction of rotation of the impeller of the fan 90 will be the direction in which the fan was rotating during the last start.
- the motorized switching unit 20 comprises a motor 21 and a series of switches 23 actuated by the motor 21.
- Figures 2 , 3 and 4 show an example of a box-like body 11 containing the power supply and actuation apparatus 10.
- the latter comprises conventional interface elements 18, 19 (switches, button panel for controlling the electronic control system, etc.) and aeration grilles 12.
- the power supply and actuation apparatus 10 is adapted to be connected to a network (MODBUS protocol) for remote control and transmission of information (current, voltage, direction of rotation, hours of operation power factor, energy consumption, vibrations).
- a network MODBUS protocol
- the box-like body 11 has a housing made of stainless steel with an IP55 protection rating, and is resistant to the action of chemical agents, to shocks and to vibrations, with switch and circuit breaker.
- the power supply and actuation apparatus 10 has the following characteristics:
- the power supply and actuation apparatus 10 also comprises analog and/or digital inputs for carrying out the monitoring of the fan (using a temperature sensor, vibration sensor, horizontal level sensor etc.).
- the ventilation system 1 for road tunnels can comprise a plurality of fans 90, positioned at various zones of the tunnel, each one provided with a respective power supply and actuation apparatus 10.
- the fans 90 located inside the tunnel can all start together with the speed variators in order to eliminate the gases under normal conditions of transit or when vehicles are stopped owing to an accident that does not result in fire.
- the electronic control system of the power supply and actuation apparatus 10 regulates the rotation speed of the fan 90 in terms of number of rpm and in the most suitable direction of flow, based on the environmental conditions.
- the fans 90 In the presence of fire, with the fans 90 operating, the fans will be regulated as a function of the location and characteristics of the fire.
- the fans located at the point where the fire is located will operate under normal conditions up to a threshold temperature (for example 55-60°C), detected by the detection device temperature, after which, by way of the motorized switching unit 20, the switchover to the emergency configuration (direct operation) will be effected, operating under these conditions up to 400°C for a maximum length of time of two hours.
- a threshold temperature for example 55-60°C
- the fans 90 that are located outside the zone where the fire is located are started in the ordinary configuration, and the fans that are located in the zone of the fire and/or with a temperature higher than 55-60°C are started in the emergency configuration, as they can operate under these conditions at up to 400°C for two hours.
- fans 90 are controlled by a central system control unit which, by way of programs that receive information from pressure sensors, temperature sensors, environmental pollution sensors, or other physical, chemical or environmental parameters, located inside the tunnel and which, through a bus connection provided with fire-resistant cables or optic fibers, after analyzing all the parameters, set the speed and correct directions for operation under optimal conditions from the point of view of safety and the energy consumption, for example as described above.
- a central system control unit which, by way of programs that receive information from pressure sensors, temperature sensors, environmental pollution sensors, or other physical, chemical or environmental parameters, located inside the tunnel and which, through a bus connection provided with fire-resistant cables or optic fibers, after analyzing all the parameters, set the speed and correct directions for operation under optimal conditions from the point of view of safety and the energy consumption, for example as described above.
- This control unit in practice comprises a programmable electronic apparatus and is functionally connected to the power supply and actuation apparatuses 10 of each fan 90 so as to control them.
- the ventilation system for road tunnels achieves the intended aim and objects in that it is capable of ensuring greater reliability in the event of fire.
- Another advantage of the ventilation system for road tunnels consists in that it reduces consumption and the absorbed power and also the noise levels.
- Another advantage of the ventilation system for road tunnels, according to the invention, consists in that it is easy to implement and economically competitive.
- Another advantage of the ventilation system for road tunnels consists in that it ensures permanent control of the air flow.
Abstract
Description
- The present invention relates to a ventilation system for road tunnels.
- As is known, the presence of a ventilation system is of fundamental importance for the safety of a tunnel.
- In particular, the main regulations and directives at national and European level on safety in road tunnels and motorway tunnels of a length greater than 1000 meters require the installation of "jet fan" or centralized ventilation systems, based on the results of risk analysis.
- The choice and the dimensioning of the ventilation system must take into consideration the statistics for possible accidents that can cause fires and spills of toxic, harmful and inflammable substances. It must contribute to ensuring the level of safety set by the application of the risk analysis methodology and it must result in the definition of optimal plant engineering that is capable of ensuring:
- the dilution of vehicle emissions inside the tunnel under operating conditions (sanitary ventilation);
- the environmental compatibility of the structure;
- the management and control of smoke in the event of possible accidents identified as major (emergency ventilation).
- Currently the fans produced internationally are usually constituted by the following elements:
- fan housing made of galvanized or stainless sheet steel;
- symmetrically- or asymmetrically-bladed impeller made of aluminum alloy or stainless steel;
- electric motor with supporting base;
- rigid suspension system;
- safety system;
- horizontal level sensor;
- vibration sensor;
- direct power supply or power supply through soft starter.
- Furthermore, ventilation systems for tunnels comprise speed variators which must be installed in the vicinity of the fans.
- If it is not possible to install speed variators in the vicinity of the fans, then the cross-section of the power supply cable of the motor placed between the variator and the terminals of the motor itself must be screened, unless otherwise indicated by the manufacturer of the inverter.
- In particular, as also prescribed by the regulations, the level of the characteristics of resistance and reaction to fire of the components of all the plants and systems of the tunnel must take account of their structuring and degree of exposure to fire and of technological possibilities, and it must make it possible to maintain the necessary safety functions in the event of fire.
- Practical tests have shown, for conventional fans, correct operation under steady-speed conditions in the presence of temperatures higher than 400°C. However, under variable-speed conditions with the use of speed variators, it has been found that after a limited number of sequences of starting and inverting the direction of rotation, the system is affected by resonance frequencies which lead to brittle fracture if the impeller is made of aluminum with consequent increase of the vibrations inside the fan.
- Furthermore it is also desirable for the speed variators to ensure an operating temperature higher than 400°C.
- It is in fact of little use to adopt fire-resistant cables, electricity generators and redundant power supplies, when the critical safety element goes out of service at 55-60°C.
- The aim of the present invention is to provide a ventilation system for road tunnels that is capable of solving the above mentioned problems and overcoming the above mentioned limitations of the background art.
- Within this aim, an object of the present invention is to provide a ventilation system for road tunnels that is capable of ensuring greater reliability in the event of fire.
- Another object of the invention consists of providing a ventilation system for road tunnels that is capable of reducing consumption and the absorbed power.
- Another object of the invention consists of providing a ventilation system for road tunnels that is easy to implement and economically competitive.
- This aim and these and other objects which will become more apparent hereinafter are achieved by a ventilation system for road tunnels according to
claim 1. - Further characteristics and advantages of the invention will become more apparent from the detailed description of a preferred, but not exclusive, embodiment of a ventilation system for road tunnels, illustrated by way of non-limiting example with the aid of the accompanying drawings wherein:
-
Figure 1 is an electrical diagram of part of the ventilation system according to the invention; -
Figures 2 ,3 and4 are, respectively, a front elevation view and two side views of a possible embodiment of the power supply and actuation apparatus of the ventilation system. - With reference to the figures, the ventilation system for road tunnels, generally designated by the
reference numeral 1, comprises at least onefan 90 which is adapted to be arranged, in a known manner, inside the tunnel. - The
fan 90 is a fan adapted for the ventilation of road tunnels and comprises, in a known manner, at least one symmetrically- or asymmetrically-bladed impeller (preferably made of stainless steel) and an electric motor that rotates the impeller. - Normally the
fan 90 also comprises: a fan housing made of stainless sheet steel, a supporting base for the motor, a rigid suspension system, a horizontal level sensor, and a vibration sensor. - The
ventilation system 1 also comprises a power supply andactuation apparatus 10 which electrically powers thefan 90, and this power supply andactuation apparatus 10 is connected to an electricpower supply line 41. - This power supply and
actuation apparatus 10 comprises an electronic control system which is configured to control the speed and the direction of rotation of thefan 90. - This electronic control system in turn comprises an electrical conversion device 30 (such as an inverter) and optionally also an
electric switching unit 31, interposed between thepower supply line 41 and thefan 90. - In the preferred embodiments, the
electrical conversion device 30 varies the frequency and/or the amplitude of the electric current in order to actuate and vary the speed of thefan 90. - According to the invention, the
ventilation system 1 comprises at least one temperature detection device which is positioned in the power supply andactuation apparatus 10 and/or in, or proximately to, thefan 90. - Furthermore, according to the invention, the power supply and
actuation apparatus 10 comprises a motorizedswitching unit 20 which is configured to modify, as a function of the temperature detected by the above mentioned temperature detection device, the configuration of the power supply andactuation apparatus 10 from an ordinary configuration to an emergency configuration, and vice versa. - In the ordinary configuration the power supply and
actuation apparatus 10 powers thefan 90 by means of the electrical conversion device 30 (inverter). - In an emergency configuration the motorized
switching unit 20 isolates theelectrical conversion device 30, creating (inside the motorizedswitching unit 20 itself) an electrical bypass so as to supply power directly to thefan 90 from theelectrical line 41. The electrical bypass is thermally isolated so as to withstand temperatures higher than 400°C for at least two hours. -
Figure 1 shows the diagram of the power section of the preferred embodiment of the power supply andactuation apparatus 10. - Preferably, the motorized
switching unit 20 is contained inside a textile protection made of mineral wool, or the motorizedswitching unit 20 itself is configured (using conventional techniques) to withstand a temperature of 400°C for at least two hours. - Therefore the bypass can operate under load at the rated current, at a temperature of 400°C and for a minimum length of time of 2 hours.
- The motorized
switching unit 20 further makes it possible to actuate thefan 90 in both directions of rotation. - Preferably, the power supply and
actuation apparatus 10 is accommodated inside a box-like body 11 made of sheet metal 11 (preferably stainless steel) provided with a thermal insulation layer (inside the sheet metal). - In a particular preferred embodiment, the box-like body of
sheet metal 11 is a stainless steel structure and its dimensions are 800mm x 1400mm x 450mm, but the dimensions can vary depending on the power installed and/or on the dimensions of the elements installed inside. - Preferably, there is a temperature detection device which is positioned proximately to the
fan 90 in order to detect the temperature proximate tosuch fan 90 and which is functionally connected to the electronic control system, so that if the temperature at which thefan 90 operates exceeds a threshold value (for example 55-60°C) the electronic control system induces, by way of the motorizedswitching unit 20, the switchover to the emergency configuration. - In this case an emergency command is sent remotely to the power supply and
actuation apparatus 10, and the latter, by means of the motorizedswitching unit 20, performs the switchover from ordinary configuration (actuation by inverter) to emergency configuration (bypass). The emergency command is also associated with a command governing the direction of rotation of thefan 90. - In the preferred embodiment, the power supply and
actuation apparatus 10 also comprises a thermostat, which comprises a respective temperature detection device inside the box-like body 11, which is configured to actuate the motorizedswitching unit 20 in order to provide the emergency configuration when the detected temperature is equal to or higher than a threshold temperature (preferably 55-60°C). In this case the direction of rotation of the impeller of thefan 90 will be the direction in which the fan was rotating during the last start. - In more detail, the
motorized switching unit 20 comprises amotor 21 and a series ofswitches 23 actuated by themotor 21. -
Figures 2 ,3 and4 show an example of a box-like body 11 containing the power supply andactuation apparatus 10. The latter comprisesconventional interface elements 18, 19 (switches, button panel for controlling the electronic control system, etc.) andaeration grilles 12. - With reference now to a particular preferred embodiment, the power supply and
actuation apparatus 10 is adapted to be connected to a network (MODBUS protocol) for remote control and transmission of information (current, voltage, direction of rotation, hours of operation power factor, energy consumption, vibrations). - The box-
like body 11 has a housing made of stainless steel with an IP55 protection rating, and is resistant to the action of chemical agents, to shocks and to vibrations, with switch and circuit breaker. - Also in this preferred embodiment, the power supply and
actuation apparatus 10 has the following characteristics: - input voltage level (V in): 380 - 480V ±10% / 600 - 690V ±10%;
- input frequency: 48-63 Hz;
- output frequency: 0-320 Hz;
- frequency resolution: 0.01 Hz;
- operating temperature: -10 to 50°C;
- storage temperature: -40 to 70°C.
- Furthermore it comprises a harmonics filter LCL TDH <5% and a circuit breaker with a mechanical impediment that can be padlocked and withstand a temperature of 400°C for 2 hours.
- Preferably, the power supply and
actuation apparatus 10 also comprises analog and/or digital inputs for carrying out the monitoring of the fan (using a temperature sensor, vibration sensor, horizontal level sensor etc.). - The
ventilation system 1 for road tunnels can comprise a plurality offans 90, positioned at various zones of the tunnel, each one provided with a respective power supply andactuation apparatus 10. - The operation of the
ventilation system 1 is described below. - Under normal conditions the
fans 90 located inside the tunnel can all start together with the speed variators in order to eliminate the gases under normal conditions of transit or when vehicles are stopped owing to an accident that does not result in fire. - The electronic control system of the power supply and
actuation apparatus 10 regulates the rotation speed of thefan 90 in terms of number of rpm and in the most suitable direction of flow, based on the environmental conditions. - In the presence of fire, with the
fans 90 operating, the fans will be regulated as a function of the location and characteristics of the fire. - The fans located at the point where the fire is located will operate under normal conditions up to a threshold temperature (for example 55-60°C), detected by the detection device temperature, after which, by way of the
motorized switching unit 20, the switchover to the emergency configuration (direct operation) will be effected, operating under these conditions up to 400°C for a maximum length of time of two hours. - In the event of a fire when the fans are stopped, the
fans 90 that are located outside the zone where the fire is located are started in the ordinary configuration, and the fans that are located in the zone of the fire and/or with a temperature higher than 55-60°C are started in the emergency configuration, as they can operate under these conditions at up to 400°C for two hours. - In advanced embodiments in which there are a plurality of
fans 90, such fans are controlled by a central system control unit which, by way of programs that receive information from pressure sensors, temperature sensors, environmental pollution sensors, or other physical, chemical or environmental parameters, located inside the tunnel and which, through a bus connection provided with fire-resistant cables or optic fibers, after analyzing all the parameters, set the speed and correct directions for operation under optimal conditions from the point of view of safety and the energy consumption, for example as described above. - This control unit in practice comprises a programmable electronic apparatus and is functionally connected to the power supply and
actuation apparatuses 10 of eachfan 90 so as to control them. - In practice it has been found that the ventilation system for road tunnels according to the present invention achieves the intended aim and objects in that it is capable of ensuring greater reliability in the event of fire.
- Another advantage of the ventilation system for road tunnels, according to the invention, consists in that it reduces consumption and the absorbed power and also the noise levels.
- Another advantage of the ventilation system for road tunnels, according to the invention, consists in that it is easy to implement and economically competitive.
- Another advantage of the ventilation system for road tunnels, according to the invention, consists in that it ensures permanent control of the air flow.
- The ventilation system for road tunnels thus conceived is susceptible of numerous modifications and variations all of which are within the scope of the appended claims.
- Moreover, all the details may be substituted by other, technically equivalent elements.
- In practice the materials employed, and the contingent dimensions and shapes, may be any according to requirements and to the state of the art.
- The disclosures in
Italian Patent Application No. 102021000015140 - Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs
Claims (7)
- A ventilation system (1) for road tunnels, which comprises at least one fan (90) and a power supply and actuation apparatus (10) which is connected to an electric power supply line (41) and supplies electric power to the fan (90);wherein said power supply and actuation apparatus (10) comprises an electronic control system configured to control the speed and the direction of rotation of the fan (90) and comprises an electrical conversion device (30) interposed between the power supply line (4) and the fan (90);characterized in that it comprises at least one temperature detection device,and in that said power supply and actuation apparatus (10) comprises a motorized switching unit (20) which is configured to modify, as a function of the temperature detected by said temperature detection device, the configuration of said power supply and actuation apparatus (10):from an ordinary configuration, in which said power supply and actuation apparatus (10) supplies power to the fan (90) by means of said electrical conversion device (30),to an emergency configuration, in which said motorized switching unit (20) isolates said electrical conversion device (30), creating an electrical bypass so as to supply power directly to the fan (90) from said electrical line (41) and vice versa.
- The ventilation system (1) according to claim 1, characterized in that said motorized switching unit (20) is contained inside a textile protection made of mineral wool.
- The ventilation system (1) according to claim 1 or 2, characterized in that said power supply and actuation apparatus (10) comprises a thermostat which is configured to actuate said motorized switching unit (20) in order to provide said emergency configuration when said detected temperature is equal to or greater than a predetermined threshold temperature.
- The ventilation system (1) according to one or more of the preceding claims, characterized in that said power supply and actuation apparatus (10) is accommodated inside a box-like body made of sheet metal (11) provided with a thermal insulation layer.
- The ventilation system (1) according to one or more of the preceding claims, characterized in that it comprises a temperature detection device which is located proximate to the fan (90) in order to detect the temperature proximate to said fan and which is functionally connected to said electronic control system.
- The ventilation system (1) according to one or more of the preceding claims, characterized in that said motorized switching unit (20) comprises a motor (21) and a series of switches (23) actuated by said motor (21).
- The ventilation system (1) according to one or more of the preceding claims, characterized in that it comprises a plurality of fans (90), each one powered and actuated by a respective power supply and actuation apparatus (10), and a central system control unit which comprises a programmable electronic apparatus and which is functionally connected to the power supply and actuation apparatuses (10) of each fan (90) so as to control them as a function of physical, chemical or environmental parameters detected by one or more sensors which are adapted to be arranged in the tunnel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT202100015140 | 2021-06-10 |
Publications (1)
Publication Number | Publication Date |
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EP4102028A1 true EP4102028A1 (en) | 2022-12-14 |
Family
ID=77627330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22176519.1A Pending EP4102028A1 (en) | 2021-06-10 | 2022-05-31 | Ventilation system for road tunnels |
Country Status (1)
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EP (1) | EP4102028A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191016309A (en) * | 1910-07-08 | 1911-07-10 | Waygood & Company Ltd R | Improvements in or relating to Hydraulic Lifts, Cranes and the like. |
JP2010265655A (en) * | 2009-05-13 | 2010-11-25 | Sohatsu System Kenkyusho:Kk | Ventilation control system for long distance road tunnel |
EP2827215A1 (en) * | 2012-03-14 | 2015-01-21 | Talleres Zitrón, S.A. | System and method for electronic control of the rotation speed of a fan impeller |
EP3000663A1 (en) * | 2014-04-09 | 2016-03-30 | Talleres Zitrón, S.A. | System for acquiring and monitoring electrical and pneumatic signals originating from ventilation devices |
-
2022
- 2022-05-31 EP EP22176519.1A patent/EP4102028A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191016309A (en) * | 1910-07-08 | 1911-07-10 | Waygood & Company Ltd R | Improvements in or relating to Hydraulic Lifts, Cranes and the like. |
JP2010265655A (en) * | 2009-05-13 | 2010-11-25 | Sohatsu System Kenkyusho:Kk | Ventilation control system for long distance road tunnel |
EP2827215A1 (en) * | 2012-03-14 | 2015-01-21 | Talleres Zitrón, S.A. | System and method for electronic control of the rotation speed of a fan impeller |
EP3000663A1 (en) * | 2014-04-09 | 2016-03-30 | Talleres Zitrón, S.A. | System for acquiring and monitoring electrical and pneumatic signals originating from ventilation devices |
Non-Patent Citations (2)
Title |
---|
BASSLER AXEL ET AL: "Dynamic Tunnel Model - Current Practice", 12 June 2018 (2018-06-12), pages 1 - 9, XP055894683, Retrieved from the Internet <URL:https://tunnel-graz.at> [retrieved on 20220223] * |
JAVIER LUIS ET AL: "Variable Pitch Fans Evolution Proofing Underground Works", 1 December 2020 (2020-12-01), pages 1 - 23, XP055894612, Retrieved from the Internet <URL:https://tunnel-graz.at> [retrieved on 20220223] * |
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17Q | First examination report despatched |
Effective date: 20230713 |