CA2170226A1 - Fire suppression system and variable pitch fan assembly and method of operation thereof - Google Patents
Fire suppression system and variable pitch fan assembly and method of operation thereofInfo
- Publication number
- CA2170226A1 CA2170226A1 CA 2170226 CA2170226A CA2170226A1 CA 2170226 A1 CA2170226 A1 CA 2170226A1 CA 2170226 CA2170226 CA 2170226 CA 2170226 A CA2170226 A CA 2170226A CA 2170226 A1 CA2170226 A1 CA 2170226A1
- Authority
- CA
- Canada
- Prior art keywords
- fire
- engine
- fan
- variable pitch
- blades
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0063—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames with simultaneous removal of inflammable materials
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A variable pitch fan and fire suppression assembly for an engine in an engine compartment has a temperature sensor and controller that cause the variable pitch fan to move to a neutral, air blocking position, upon the sensing of a fire. Fire suppressant is discharged into the engine compartment of the engine after the fan blades have been moved to the neutral position.
Description
TITLE OF THE INVENTION:
Fire Suppression System and Variable Pitch Fan Assembly and Method of Operation Thereof NAME(S) OF INVENTOR(S):
Dieter A. Tischler FIELD OF THE INVENTION
The present invention relates to a fire suppression system and variable pitch fan assembly, and to a method of enhancing fire suppressant delivery to an engine.
R~K~ROUND OF THE INVENTION
An engine compartment of a heavy industrial vehicle contains mufflers, turbochargers, hot oil pipes, and other operating components that generate heat. The air in the operating environment of such heavy industrial vehicle is often laden with particulate debris that is highly flammable. To m; n;m; ze the risk of fire damage, fire suppression systems have been developed for installation within the engine compartment. Such a fire suppression system has included a sensor that is capable of detecting a fire, and a chemical discharge tank that discharges a fire retardant chemical upon receiving a signal from the sensor. The most commonly used form of fire retardant chemical is a dry powder.
A difficulty arises with these fire suppression systems. The cooling fan on a large engine moves 25,000 to 50,000 cubic feet of air per minute. The cooling fan tends to blow such a large proportion of the dry powder-like fire retardant chemical out of the engine compartment, that the efficacy of the fire suppression system may be reduced.
One way to prevent the cooling fan from blowing fire -retardant chemical out of the engine compartment is to shut the engine down immediately upon receiving a signal from the sensor indicating the presence of a fire and prior to the discharge of fire retardant chemical. This approach avoids the problem of air flow, but has the inherent disadvantage of leaving the heavy industrial vehicle stranded, possibly placing the driver in great danger as for example in the middle of a burning wood chip pile or land fill site, and risking damage to the engine.
In a further solution believed to have been presented in the prior art, shutters on the engine were closed upon the detection of a fire to prevent passage of air through the engine.
SUMMARY OF THE INVENTION
The inventor has proposed here a method of controlling the injection of fire retardant chemical into an engine compartment that does not require the engine to be shut down to be effective and does not require shutters.
The invention is an improvement for engines with variable pitch fans, such as the variable pitch fan made by Flexxaire Manufacturing Inc. of Edmonton, Alberta, Canada.
According to one aspect of the present invention there is provided a fire suppression system and variable pitch fan assembly, comprising:
a variable pitch cooling fan having a plurality of blades, the blades having variable pitch, including a push position, pull position and neutral;
a fire suppression system including a reservoir of fire retardant chemical, the fire suppression system having means to initiate discharge of fire suppressant upon a fire being sensed;
-a temperature sensor for producing output representative of the operating temperature of an engine to which the variable pitch fan is to be attached;
a controller for controlling the pitch of the fan 5 blades in response to the output of the temperature sensor;
and the controller being configured to immediately move the blades of the cooling fan to the neutral position upon a fire being sensed.
According to a further aspect of the invention, there is provided a fire suppression system and variable pitch fan assembly of claim 1 further including:
a fire sensor connected to provide a signal indicative of a fire to the fire suppression system;
a switch operative in response to a signal indicative of a fire to cause delivery of fire suppressant;
and the switch being connected to the controller to provide a signal indicative of the presence of a fire.
According to a still further aspect of the invention, there is provided a method of controlling a variable pitch fan of an engine, in which the engine has a desired operating temperature and the variable pitch fan has constant rotational speed, the variable pitch fan having fan blades, the method comprising the steps of:
decreasing the pitch of the fan blades when the engine temperature is below the desired operating temperature of the engine;
increasing the pitch of the fan blades when the engine temperature is above the desired operating temperature of the engine; and immediately moving the pitch of the fan blades to neutral upon a fire being detected.
Fire Suppression System and Variable Pitch Fan Assembly and Method of Operation Thereof NAME(S) OF INVENTOR(S):
Dieter A. Tischler FIELD OF THE INVENTION
The present invention relates to a fire suppression system and variable pitch fan assembly, and to a method of enhancing fire suppressant delivery to an engine.
R~K~ROUND OF THE INVENTION
An engine compartment of a heavy industrial vehicle contains mufflers, turbochargers, hot oil pipes, and other operating components that generate heat. The air in the operating environment of such heavy industrial vehicle is often laden with particulate debris that is highly flammable. To m; n;m; ze the risk of fire damage, fire suppression systems have been developed for installation within the engine compartment. Such a fire suppression system has included a sensor that is capable of detecting a fire, and a chemical discharge tank that discharges a fire retardant chemical upon receiving a signal from the sensor. The most commonly used form of fire retardant chemical is a dry powder.
A difficulty arises with these fire suppression systems. The cooling fan on a large engine moves 25,000 to 50,000 cubic feet of air per minute. The cooling fan tends to blow such a large proportion of the dry powder-like fire retardant chemical out of the engine compartment, that the efficacy of the fire suppression system may be reduced.
One way to prevent the cooling fan from blowing fire -retardant chemical out of the engine compartment is to shut the engine down immediately upon receiving a signal from the sensor indicating the presence of a fire and prior to the discharge of fire retardant chemical. This approach avoids the problem of air flow, but has the inherent disadvantage of leaving the heavy industrial vehicle stranded, possibly placing the driver in great danger as for example in the middle of a burning wood chip pile or land fill site, and risking damage to the engine.
In a further solution believed to have been presented in the prior art, shutters on the engine were closed upon the detection of a fire to prevent passage of air through the engine.
SUMMARY OF THE INVENTION
The inventor has proposed here a method of controlling the injection of fire retardant chemical into an engine compartment that does not require the engine to be shut down to be effective and does not require shutters.
The invention is an improvement for engines with variable pitch fans, such as the variable pitch fan made by Flexxaire Manufacturing Inc. of Edmonton, Alberta, Canada.
According to one aspect of the present invention there is provided a fire suppression system and variable pitch fan assembly, comprising:
a variable pitch cooling fan having a plurality of blades, the blades having variable pitch, including a push position, pull position and neutral;
a fire suppression system including a reservoir of fire retardant chemical, the fire suppression system having means to initiate discharge of fire suppressant upon a fire being sensed;
-a temperature sensor for producing output representative of the operating temperature of an engine to which the variable pitch fan is to be attached;
a controller for controlling the pitch of the fan 5 blades in response to the output of the temperature sensor;
and the controller being configured to immediately move the blades of the cooling fan to the neutral position upon a fire being sensed.
According to a further aspect of the invention, there is provided a fire suppression system and variable pitch fan assembly of claim 1 further including:
a fire sensor connected to provide a signal indicative of a fire to the fire suppression system;
a switch operative in response to a signal indicative of a fire to cause delivery of fire suppressant;
and the switch being connected to the controller to provide a signal indicative of the presence of a fire.
According to a still further aspect of the invention, there is provided a method of controlling a variable pitch fan of an engine, in which the engine has a desired operating temperature and the variable pitch fan has constant rotational speed, the variable pitch fan having fan blades, the method comprising the steps of:
decreasing the pitch of the fan blades when the engine temperature is below the desired operating temperature of the engine;
increasing the pitch of the fan blades when the engine temperature is above the desired operating temperature of the engine; and immediately moving the pitch of the fan blades to neutral upon a fire being detected.
2 1 70226 These and other aspects and advantages of the invention are described and claimed in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIG. 1 is a schematic of a prior art variable pitch fan and engine assembly; and FIG. 2 is a schematic of a fire suppression system and variable pitch fan assembly in accordance with the present invention.
DETAILED DESCRIPTION OF THE Pn~ nRED EMBODIMENT
For the better understanding of the invention, a prior art variable pitch fan and engine assembly will now be described with reference to FIGURE 1. The variable pitch fan assembly is made by Flexxaire Manufacturing Inc.
of Edmonton, Alberta, and has been installed on various pieces of heavy equipment, such as woodchip arrangements sold in North America under the designations D6H, D7H, D8N, and D9N and made in the United States by Caterpillar Inc.
of Peoria, Illinois.
Engine 12 and variable pitch fan assembly are positioned within an engine compartment 14. Engine compartment 14 is from a piece of heavy equipment, a cab 16 of which is illustrated, such as the woodchip arrangements noted above. Variable pitch cooling fan 18 is disposed within engine compartment 14 and attached to engine 12.
The blades 21 of cooling fan 18 have plurality of blade positions, including a push position (reverse blade position), pull position (conventional or normal position) and neutral position in which the rotation of the blades continues and blocks air flow (air block effect). The pitch of the blades 21 may be varied in small angular increments by actuator 23. An exemplary cooling fan is described in United States patent no. 5,122,034. The air block effect is described in published Canadian application no. 2,080,268.
A controller 20 is coupled to cooling fan 18 by means of actuator cable 19 and actuator 23 and serves to adjust the positioning of fan blades 21 by providing signals to the actuator 23 along cable 19. A conventional sensor 22 is provided for sensing the engine temperature. Sensor 22 is coupled to controller 20 by means of a cable 24. Controller 20 receives power from battery 17.
The controller 20 works as follows. The engine operating temperature is determined from manufacturer specifications and is stored in the controller 20 as a set point. An example is 180F The controller 20 is programmed so that if the engine temperature is above the set point, the pitch of the fan blades 21 is increased, and if the temperature of the engine is below the set point, the pitch of the fan blades 21 is decreased. The pitch of the fan blades 21 is altered by the actuator 23 attached to the variable pitch fan assembly. The rotation speed of the fan is determined in conventional manner by the pulleys by which it is attached to the engine 12. The controller 20 is also programmed so that, upon request (by pushing a purge button on the control panel), the fan blades 21 may be set to reverse pitch for a desired period of time to purge the radiator of debris, dust, etc. The time duration of the purge may also be set through the control panel.
Now referring to Fig. 2, an embodiment of the invention is disclosed in which a fire suppression system 25 is attached to the equipment at a suitable location, such as the cab 16, and includes a reservoir 32 of fire retardant chemical having a discharge tube 26. A fire sensor 28 of conventional design (for example, a heat or infra red sensor) is disposed within the engine compartment 14, for example attached to the engine 12. The fire sensor 28 provides a signal along cable 29 to fire suppression control switch 27, which in turn is connected via cable 30 to the controller 20. The fire suppression equipment, including the reservoirs 32 and sensor 28, is conventional and available from such sources as Ansul Fire Suppression Equipment, and Levitt Safety Limited, the latter having offices in Edmonton, Alberta, Canada, and the former being well known in the industry.
The use and operation of fire suppressant and variable pitch fan assembly of Fig. 2 will now be described. Upon receiving a signal from sensor 28, the fire suppression control switch 27 sends a signal to the controller 20 along cable 30. The signal on cable 30 activates an interrupt circuit which interrupts the normal operation of the controller 20. Upon interruption of normal operation, the controller 20 sends a signal to the actuator 23 causing the fan blades 21 to move to the neutral position. The fire suppression control 27 then, with a short delay of a few seconds (about 2-3 seconds), which allows air within the compartment to settle down, initiates a discharge of fire suppressant into the engine compartment 14. Once blades 21 have been moved to the neutral position, cooling fan 18 will continue to rotate with the r.p.m. of the engine, but there will be negligible air movement. In addition, due to the air block effect of the fan blades while rotating in neutral, even if the vehicle is still moving, there will be effectively no flow of air into the engine compartment. It is therefore preferred to allow the fan blades to continue rotating even after the detection of a fire to provide the air block effect for air moving into the engine compartment.
In an alternative embodiment, the cable 30 may be omitted, and the sensing of a fire can be carried out by a second fire sensor similar to the sensor 28 connected directly to the controller 20. In this case, the controller 20 must be programmed to interrupt the variation of pitch upon occurrence of a signal from the second sensor and move the blades immediately to the neutral position.
The controller 20 may be the one supplied with the variable pitch fan made by Flexxaire Manufacturing Inc., of Edmonton, Alberta, Canada, since it already includes an unused circuit that may accept the signal from the switch 27 as an input and that may be used as an interrupt circuit. Alternatively, the controller 20 may be made using any of various microprocessors available on the market programmed in accordance with the information supplied in this patent document.
The invention is not limited by the type of fire suppressant used. In addition, upon the occurrence of a fire, conventional systems may be used to alert the operator to the fire hazard.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIG. 1 is a schematic of a prior art variable pitch fan and engine assembly; and FIG. 2 is a schematic of a fire suppression system and variable pitch fan assembly in accordance with the present invention.
DETAILED DESCRIPTION OF THE Pn~ nRED EMBODIMENT
For the better understanding of the invention, a prior art variable pitch fan and engine assembly will now be described with reference to FIGURE 1. The variable pitch fan assembly is made by Flexxaire Manufacturing Inc.
of Edmonton, Alberta, and has been installed on various pieces of heavy equipment, such as woodchip arrangements sold in North America under the designations D6H, D7H, D8N, and D9N and made in the United States by Caterpillar Inc.
of Peoria, Illinois.
Engine 12 and variable pitch fan assembly are positioned within an engine compartment 14. Engine compartment 14 is from a piece of heavy equipment, a cab 16 of which is illustrated, such as the woodchip arrangements noted above. Variable pitch cooling fan 18 is disposed within engine compartment 14 and attached to engine 12.
The blades 21 of cooling fan 18 have plurality of blade positions, including a push position (reverse blade position), pull position (conventional or normal position) and neutral position in which the rotation of the blades continues and blocks air flow (air block effect). The pitch of the blades 21 may be varied in small angular increments by actuator 23. An exemplary cooling fan is described in United States patent no. 5,122,034. The air block effect is described in published Canadian application no. 2,080,268.
A controller 20 is coupled to cooling fan 18 by means of actuator cable 19 and actuator 23 and serves to adjust the positioning of fan blades 21 by providing signals to the actuator 23 along cable 19. A conventional sensor 22 is provided for sensing the engine temperature. Sensor 22 is coupled to controller 20 by means of a cable 24. Controller 20 receives power from battery 17.
The controller 20 works as follows. The engine operating temperature is determined from manufacturer specifications and is stored in the controller 20 as a set point. An example is 180F The controller 20 is programmed so that if the engine temperature is above the set point, the pitch of the fan blades 21 is increased, and if the temperature of the engine is below the set point, the pitch of the fan blades 21 is decreased. The pitch of the fan blades 21 is altered by the actuator 23 attached to the variable pitch fan assembly. The rotation speed of the fan is determined in conventional manner by the pulleys by which it is attached to the engine 12. The controller 20 is also programmed so that, upon request (by pushing a purge button on the control panel), the fan blades 21 may be set to reverse pitch for a desired period of time to purge the radiator of debris, dust, etc. The time duration of the purge may also be set through the control panel.
Now referring to Fig. 2, an embodiment of the invention is disclosed in which a fire suppression system 25 is attached to the equipment at a suitable location, such as the cab 16, and includes a reservoir 32 of fire retardant chemical having a discharge tube 26. A fire sensor 28 of conventional design (for example, a heat or infra red sensor) is disposed within the engine compartment 14, for example attached to the engine 12. The fire sensor 28 provides a signal along cable 29 to fire suppression control switch 27, which in turn is connected via cable 30 to the controller 20. The fire suppression equipment, including the reservoirs 32 and sensor 28, is conventional and available from such sources as Ansul Fire Suppression Equipment, and Levitt Safety Limited, the latter having offices in Edmonton, Alberta, Canada, and the former being well known in the industry.
The use and operation of fire suppressant and variable pitch fan assembly of Fig. 2 will now be described. Upon receiving a signal from sensor 28, the fire suppression control switch 27 sends a signal to the controller 20 along cable 30. The signal on cable 30 activates an interrupt circuit which interrupts the normal operation of the controller 20. Upon interruption of normal operation, the controller 20 sends a signal to the actuator 23 causing the fan blades 21 to move to the neutral position. The fire suppression control 27 then, with a short delay of a few seconds (about 2-3 seconds), which allows air within the compartment to settle down, initiates a discharge of fire suppressant into the engine compartment 14. Once blades 21 have been moved to the neutral position, cooling fan 18 will continue to rotate with the r.p.m. of the engine, but there will be negligible air movement. In addition, due to the air block effect of the fan blades while rotating in neutral, even if the vehicle is still moving, there will be effectively no flow of air into the engine compartment. It is therefore preferred to allow the fan blades to continue rotating even after the detection of a fire to provide the air block effect for air moving into the engine compartment.
In an alternative embodiment, the cable 30 may be omitted, and the sensing of a fire can be carried out by a second fire sensor similar to the sensor 28 connected directly to the controller 20. In this case, the controller 20 must be programmed to interrupt the variation of pitch upon occurrence of a signal from the second sensor and move the blades immediately to the neutral position.
The controller 20 may be the one supplied with the variable pitch fan made by Flexxaire Manufacturing Inc., of Edmonton, Alberta, Canada, since it already includes an unused circuit that may accept the signal from the switch 27 as an input and that may be used as an interrupt circuit. Alternatively, the controller 20 may be made using any of various microprocessors available on the market programmed in accordance with the information supplied in this patent document.
The invention is not limited by the type of fire suppressant used. In addition, upon the occurrence of a fire, conventional systems may be used to alert the operator to the fire hazard.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A fire suppression system and variable pitch fan assembly, comprising:
a variable pitch cooling fan having a plurality of blades, the blades having variable pitch, including a push position, pull position and neutral;
a fire suppression system including a reservoir of fire retardant chemical, the fire suppression system having means to initiate discharge of fire suppressant upon a fire being sensed;
a temperature sensor for producing output representative of the operating temperature of an engine to which the variable pitch fan is to be attached;
a controller for controlling the pitch of the fan blades in response to the output of the temperature sensor;
and the controller being configured to immediately move the blades of the cooling fan to the neutral position upon a fire being sensed.
a variable pitch cooling fan having a plurality of blades, the blades having variable pitch, including a push position, pull position and neutral;
a fire suppression system including a reservoir of fire retardant chemical, the fire suppression system having means to initiate discharge of fire suppressant upon a fire being sensed;
a temperature sensor for producing output representative of the operating temperature of an engine to which the variable pitch fan is to be attached;
a controller for controlling the pitch of the fan blades in response to the output of the temperature sensor;
and the controller being configured to immediately move the blades of the cooling fan to the neutral position upon a fire being sensed.
2. The fire suppression system and variable pitch fan assembly of claim 1 further including:
a fire sensor connected to provide a signal indicative of a fire to the fire suppression system;
a switch operative in response to a signal indicative of a fire to cause delivery of fire suppressant;
and the switch being connected to the controller to provide a signal indicative of the presence of a fire.
a fire sensor connected to provide a signal indicative of a fire to the fire suppression system;
a switch operative in response to a signal indicative of a fire to cause delivery of fire suppressant;
and the switch being connected to the controller to provide a signal indicative of the presence of a fire.
3. A method of controlling a variable pitch fan of an engine, in which the engine has a desired operating temperature and the variable pitch fan has constant rotational speed, the variable pitch fan having fan blades and being installed in an engine compartment, the method comprising the steps of:
decreasing the pitch of the fan blades when the engine temperature is below the desired operating temperature of the engine;
increasing the pitch of the fan blades when the engine temperature is above the desired operating temperature of the engine; and immediately moving the pitch of the fan blades to neutral upon a fire being detected.
decreasing the pitch of the fan blades when the engine temperature is below the desired operating temperature of the engine;
increasing the pitch of the fan blades when the engine temperature is above the desired operating temperature of the engine; and immediately moving the pitch of the fan blades to neutral upon a fire being detected.
4. The method of claim 3 further including continuing to turn the cooling fan with the blades in neutral position after the detection of a fire to provide an air block effect for air moving into the engine compartment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2170226 CA2170226A1 (en) | 1996-02-23 | 1996-02-23 | Fire suppression system and variable pitch fan assembly and method of operation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2170226 CA2170226A1 (en) | 1996-02-23 | 1996-02-23 | Fire suppression system and variable pitch fan assembly and method of operation thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2170226A1 true CA2170226A1 (en) | 1997-08-24 |
Family
ID=4157626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2170226 Abandoned CA2170226A1 (en) | 1996-02-23 | 1996-02-23 | Fire suppression system and variable pitch fan assembly and method of operation thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2170226A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112023296A (en) * | 2020-08-18 | 2020-12-04 | 安徽华一德智能储存设备有限公司 | Automatic fire extinguishing device of four-way shuttle |
| CN113877098A (en) * | 2021-08-23 | 2022-01-04 | 王家雨 | Three-phase high-voltage frequency converter |
-
1996
- 1996-02-23 CA CA 2170226 patent/CA2170226A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112023296A (en) * | 2020-08-18 | 2020-12-04 | 安徽华一德智能储存设备有限公司 | Automatic fire extinguishing device of four-way shuttle |
| CN112023296B (en) * | 2020-08-18 | 2021-09-21 | 安徽华一德智能储存设备有限公司 | Automatic fire extinguishing device of four-way shuttle |
| CN113877098A (en) * | 2021-08-23 | 2022-01-04 | 王家雨 | Three-phase high-voltage frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |