Explosive fluid metering apparatus having immune data converter and method of metering explosive fluid distribution

• US 5,902,938 A
• Filed: 04/21/1997
• Issued: 05/11/1999
• Est. Priority Date: 04/21/1997
• Status: Expired due to Fees

• Current Assignee: Quantum Technology Management Limited (Quantum Controls BV)
• Original Assignee: Quantum Technology Management Limited (Quantum Controls BV)
• Inventors: Biron, Pierre, Beaudoin, Benoit
• Primary Examiner(s): PATEL, HARSHAD R
• Application Number:
  US08/840,571
• Time in Patent Office: 750 Days
• Field of Search: 73/861.77, 73/861.78, 73/861.79
• US Class Current: 73/861.77
• CPC Class Codes: G01F 1/065 with radiation as transfer means to the indicating device, e.g. light transmission
• CPC Class Codes: G01F 15/063 using electrical means
• CPC Class Codes: G01F 15/068 with electrical means G01F15/063 takes precedence
• CPC Class Codes: G06M 1/272 using photoelectric means
• CPC Class Codes: G06M 3/06 for printing or separately displaying result of count display systems G09
• CPC Class Codes: G08C 17/02 using a radio link

Abstract

An apparatus and methods are provided for metering explosive fluid. The apparatus preferably has an explosive fluid distribution pipe for distributing explosive fluid and an explosive fluid meter in fluid communication with the explosive fluid delivery pipe. The explosive fluid meter preferably includes a housing and an explosive fluid metering device positioned within the housing for metering explosive fluid. The explosive fluid metering device includes a rotatably mounted shaft rotatable responsive to explosive fluid being distributed from the explosive fluid distribution pipe. An immune data converter is positioned within the housing of the explosive fluid meter and is connected to the rotatably mounted shaft for converting the rotation of the shaft into optical data communication.

Claims

1. An explosive fluid metering apparatus for metering explosive fluid and for readily retrofitting an existing explosive fluid meter, the apparatus comprising:

an explosive fluid distribution pipe for distributing explosive fluid;

an explosive fluid meter in fluid communication with said explosive fluid delivery pipe, said explosive fluid meter including a housing devoid of electric circuits which can cause explosive fluid to ignite and explosive fluid metering means positioned within said housing for metering explosive fluid and being devoid of electric circuits which can cause explosive fluid to ignite, said housing including a light pipe opening positioned to extend therethrough, said explosive fluid metering means including a rotatably mounted shaft rotatable responsive to explosive fluid being distributed from said explosive fluid distribution pipe; and

immune data converting means positioned within said housing of said explosive fluid meter, connected to said rotatably mounted shaft, and being devoid of electric circuits which can cause explosive fluid to ignite for converting the rotation of said shaft into immune data communication which is immune from causing explosive fluid to ignite and immune from interference caused by electromagnetic forces associated with said explosive fluid meter, said immune data converting means including a rotatable disc member connected to said shaft, positioned in fluid exposure to explosive fluid and having a plurality of indicators formed in a surface thereof and at least one light pipe having a distal end positioned adjacent the rotatable disc member and having more proximal portions extending outwardly through said light pipe opening so that optical pulses responsive to the plurality of indicators are communicated remote from said housing of said explosive fluid meter, said rotatable disc member also having first and second disc member portions and at least one fastener for detachably connecting said first member portion to said second member portion so that said rotating disc member is readily detachably connected to said rotatable shaft to thereby readily retrofit the explosive fluid meter.

2. An apparatus as defined in claim 1, wherein said rotatable disc member further includes a hub defined by at least portions of said first and second disc member portions and detachably mounted to said shaft and a plate member mounted to said hub and extending outwardly therefrom, said plate member including the plurality of indicators formed in a surface thereof, and wherein the at least one light pipe comprises a pair of spaced-apart light pipes positioned so that the indicators of said plate member extend between said pair of spaced-apart light pipes so that optical pulses are formed during rotation of said shaft and said rotatable disc member connected thereto.

3. An apparatus as defined in claim 2 wherein said immune data converting means further comprises light pipe mounting means connected to each of said pair of light pipes for mounting said pair of light pipes in a spaced-apart arrangement.

4. An apparatus as defined in claim 3, herein said light pipe mounting means includes at least one mounting bracket connected to an inner surface of said housing, said at least one mounting bracket including a bracket body and an elongate slot having an open end thereof formed in said bracket body, said pair of spaced-apart light pipes being connected to opposing sides of said elongate slot, said elongate slot being positioned so that the indicators of said plate member of said rotatable disc member extend through at least portions of said slot and so that said pair of spaced-apart light pipes sense the presence and absence of the indicators.

5. An apparatus as defined in claim 2, wherein said first and second disc member portions comprise first and second halves of said rotatable disc member, each of said first and second halves including a half portion of said hub and a half portion of said plate member so that the joining of said first and second halves respectively define said hub and said plate member.

6. An apparatus as defined in claim 5, further comprising immune data controlling means positioned remote from said explosive fluid meter housing and connected to said pair of light pipes for controlling the optical communication to and from said pair of light pipes.

7. An apparatus as defined in claim 6, wherein said immune data controlling means includes an optical emitter positioned in optical communication with one of said pair of light pipes for emitting light through the one of said pair of light pipes, an optical receiver positioned in communication with the other of said pair of light pipes for receiving light therefrom, and processing means positioned in communication with said optical receiver for processing the optical communication received from the other of said pair of light pipes.

8. An explosive fluid metering immune data converting apparatus adapted to be positioned within a housing of an existing explosive fluid meter devoid of electric circuits which can cause explosive fluid to ignite and to be connected to a rotatable shaft positioned within the housing for readily retrofitting and converting the rotation of the shaft into optical data communication which is immune from causing explosive fluid to ignite and immune from interference caused by electromagnetic forces associated with the explosive fluid meter, the apparatus comprising:

a rotatable disc member positioned to be mounted to the shaft positioned within a housing of the explosive fluid meter and in fluid exposure to an explosive fluid, said rotatable disc member including first and second disc member portions, at least one fastener for detachable connecting said first member portion to said second member portion, a hub defined by at least portions of said first and second member portions and positioned to be mounted to the shaft, and a plate member mounted to said hub and extending outwardly therefrom so that said rotating disc member is readily detachably connected to said rotatable shaft to thereby allow ready retrofitting capabilities, said plate member including a plurality of indicators formed in a surface thereof; and

a pair of spaced-apart light pipes positioned so that the indicators of said plate member extend between said pair of spaced-apart light pipes so that the optical pulses are formed during rotation of the shaft and said rotatable disc member connected thereto.

9. An apparatus as defined in claim 8, further comprising light pipe mounting means connected to each of said pair of light pipes for mounting said pair of light pipes in a spaced-apart arrangement.

10. An apparatus as defined in claim 9, wherein said light pipe mounting means includes at least one mounting bracket connected to an inner surface of said housing, said at least one mounting bracket including a bracket body and an elongate slot having an open end thereof formed in said bracket body, said pair of spaced-apart light pipes being connected to opposing sides of said elongate slot, said elongate slot being positioned so that the indicators of said plate member of said rotatable disc member extend through at least portions of said slot and so that said pair of spaced-apart light pipes sense the presence and absence of the indicators.

11. An apparatus as defined in claim 10, wherein said first and second disc member portions comprise first and second halves of said rotatable disc member, each of said first and second halves including a half portion of said hub and a half portion of said plate member so that the joining of said first and second halves respectively define said hub and said plate member.

12. An apparatus as defined in claim 11, wherein the housing of the explosive fluid meter has a light pipe opening formed therein, and wherein said pair of spaced-apart light pipes have the respective distal ends thereof positioned adjacent said rotatable disc member within the housing and have more proximal portions thereof extending through said light pipe opening so that optical pulses responsive to the indicators are communicated remote from the housing of the explosive fluid meter.

13. An apparatus as defined in claim 12, further comprising immune data controlling means positioned remote from said explosive fluid meter housing and connected to said pair of light pipes for controlling the optical communication to and from said pair of light pipes.

14. An apparatus as defined in claim 13, wherein said immune data controlling means includes an optical emitter positioned in optical communication with one of said pair of light pipes for emitting light through the one of said pair of light pipes, an optical receiver positioned in communication with the other of said pair of light pipes for receiving light therefrom, and processing means positioned in communication with said optical receiver for processing the optical communication received from the other of said pair of light pipes.

15. An apparatus as defined in claim 14, wherein said plate member of said rotatable disc member has a generally circular shape, wherein said hub is connected to a medial portion of said plate member, and wherein the indicators in a surface of said plate member of said rotatable disc member comprise a plurality of open ended slots formed in said plate member and extending inwardly from outer peripheries thereof.

16. An apparatus as defined in claim 15, wherein each of said first and second halves of said hub include a semi-circular shaped groove arranged to be positioned on a circularly-shaped shaft so that when said first and second halves of said hub are joined together on the shaft said hub substantially surrounds the shaft.

17. A method of retrofitting and converting the rotation of a shaft of an existing explosive fluid meter into optical communication which is immune from causing explosive fluid to ignite and immune from interference caused by electromagnetic forces associated with the explosive meter, the existing explosive meter including a housing devoid of electric circuits which can cause explosive fluid to ignite, the method comprising the steps of:

mounting a rotatable disc member to the shaft of the explosive fluid meter in fluid exposure to an explosive fluid, the rotatable disc member including first and second disc member portions, at least one fastener for detachable connecting said first member portion to said second member portion, a hub defined by at least portions of said first and second disc members for mounting the disc member to the shaft, and a plate member connected to the hub and extending outwardly therefrom, the plate member including a plurality of indicators formed in a surface thereof; and

mounting a pair of spaced-apart light pipes positioned so that the indicators of the plate member extend between the pair of spaced-apart light pipes and so that optical pulses are formed during rotation of the shaft and the rotatable disc member connected thereto.

18. A method as defined in claim 17, wherein the step of mounting the rotatable disc member to the shaft includes detachable connecting the first disc member portion to the second disc member portion so that the rotating disc member is detachable connected to the rotatable shaft.

19. A method as defined in claim 18, further comprising controlling the optical pulses representative of optical communication to and from the pair of light pipes.

20. A method as defined in claim 19, wherein the step of controlling the optical pulses includes emitting light through one of a pair of light pipes, receiving light from the other of the pair of light pipes, and processing the light representative of optical communication received from the other of the pair of light pipes.