Patent Application
20140290801
The present invention relates to hydrides, and more particularly to a hydride assembling system, as well as a method of making a hydride batch.
Hydrides have many uses and are formed in various configurations. They are typically constructed by inserting a wire into a tube to form a tube assembly. The tube assembly is immersed in a hydrogen atmosphere and heated to a temperature above an ambient temperature. In the elevated temperature environment, the wire absorbs the hydrogen, thus becoming a hydrided material. At typical ambient temperatures, hydrogen is trapped in the hydride material, but as the ambient temperature increases, the hydrided material outgases the hydrogen and increases the pressure in a surrounding volume. Such a characteristic is useful in certain applications, such as fire detection systems, for example.
The assembly process commonly entails sealing one end of the tube assembly and introducing hydrogen to the other end in the heated condition. Unfortunately, such a process may lead to substantial non-uniformity of the hydrogen distribution along the length of the tube assembly. Additionally, by forming each hydride segment of a batch in an individual manner, the process is often slow and imprecise.
According to one embodiment, a hydride assembling system includes a first spool configured to support a sensor tube assembly comprising a wire disposed within a sensor tube. Also included is a hydrogen inlet fluidly coupled to the first spool for providing hydrogen from a hydrogen plenum. Further included is a second spool configured to receive the sensor tube assembly as the sensor tube assembly is fed from the first spool. Yet further included is a heated section at a temperature above an ambient temperature and configured to heat the sensor tube assembly as the sensor tube assembly is fed through the heated section.
According to another embodiment, a method of making a hydride batch is provided. The method includes winding a wire onto a first spool, the first spool in close proximity to a hydrogen inlet. The method also includes heating a heater section above an ambient temperature. The method further includes supplying hydrogen to the hydrogen inlet from a hydrogen plenum. The method yet further includes feeding the wire from the first spool through the heater section and toward a second spool. The method also includes absorbing hydrogen within the wire during the feeding of the wire from the first spool toward the second spool.
The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
Referring to
As noted above, the hydride assembling system 10 is used to continuously produce a batch of stock hydrided material. The hydride assembling system 10 includes a first spool 14 that is configured to support a previously constructed length of the sensor tube assembly 12. In particular, the sensor tube assembly 12 is wound onto the first spool 14 and arranged to be fed away from the first spool 14 in a direction 15 with a roller assembly 16 comprising a system of rollers and guides. The roller assembly 16 is controlled by a feed speed controller 17 to adjust the feed speed of the sensor tube assembly 12. Proximate the first spool 14 is a hydrogen inlet 18 that is fluidly coupled to a hydrogen plenum 20 that contains a hydrogen supply at a controllable pressure. The hydrogen inlet 18 is configured to introduce hydrogen to a location proximate the first spool 14 in a manner that provides hydrogen to the sensor tube assembly 12. In one embodiment, an end of the sensor tube assembly 12 is directly coupled to the hydrogen inlet 18 to introduce hydrogen directly into the end of the sensor tube assembly 12. The flow rate and amount of hydrogen supplied via the hydrogen inlet 18 is regulated with a first valve 21, such as a solenoid valve that may open and close in a pulsed manner.
The hydrogen plenum 20 is in fluid communication with a hydrogen tank 22 that is configured to supply the hydrogen plenum 20 with hydrogen gas, as needed. As shown, the pressure of the hydrogen supplied from the hydrogen tank 22 may be regulated with a hydrogen pressure regulator 24 before being routed to the hydrogen plenum 20, with a second valve 26 controlling the flow rate of the hydrogen to the hydrogen plenum 20. In one embodiment, the second valve 26 comprises a solenoid valve.
The hydride assembling system 10 includes a second spool 28 that is configured to receive and support the sensor tube assembly 12 as it is fed away from the first spool 14. Disposed proximate the second spool 28 is a vacuum component 30 that is configured to remove air from the sensor tube assembly 12. In addition to simply removing air, in one embodiment the vacuum component 30 may recycle hydrogen to the hydrogen tank 22 and/or the hydrogen plenum 20 during the hydriding process. As the sensor tube assembly 12 is fed along the roller assembly 16, the sensor tube assembly 12 is fed through a heated section 32 that is positioned between the first spool 14 and the second spool 28. The heated section 32 comprises a section that is configured to heat the sensor tube assembly 12 during translation therealong. In one embodiment, the heated section 32 is a tubular section that is configured to allow the sensor tube assembly 12 to pass therethrough. The heated section 32 is controlled to a temperature that facilitates continuous absorption of hydrogen into the wire within the sensor tube assembly 12 as the sensor tube assembly 12 is drawn through the heated section 32. The precise temperature that is required to ensure continuous absorption will vary depending on the sensor tube assembly 12. Characteristics such as wire material and thickness, for example, are variables that will affect the necessary temperature. In one embodiment, the temperature is elevated to a temperature greater than about 300° C. (about 572° F.).
Also dependent upon various characteristics of the wire, and more generally the sensor tube assembly 12, is the desired amount of hydrogen to be absorbed into the wire. Specifically, a desired concentration of hydrogen, measured by volume and/or length of the wire, is dependent upon the particular application. To determine the amount of hydrogen absorbed by the wire, a pressure differential between a location of the wire proximate the first spool 14 and the second spool 28 is monitored. The pressure drop between these locations allows a user to calculate the mass of hydrogen absorbed into the wire. Monitoring of the pressure differential is facilitated by the inclusion of a first pressure gauge 34 disposed proximate the first spool 14 and a second pressure gauge 36 disposed proximate the second spool 28.
Several components of the hydride assembling system 10 are monitored with a graphical user interface (GUI) 38 that is in operative communication with components of the hydride assembling system 10. Specifically, the hydride assembling system 10 may be employed to monitor the first pressure gauge 34, the second pressure gauge 36, the first valve 21, the second valve 26, the heated section 32, and/or the feed speed controller 17. By monitoring the above-referenced components, the GUI 38 is configured to control a plurality of operating characteristics of the hydride assembling system 10. Such characteristics include a feed rate of the wire, a temperature of the heated section 32, a pressure within the hydrogen plenum 20, and a flow rate of hydrogen flowing through the first valve 21 or the second valve 26. Monitoring and controlling these components and characteristics allows a user to modify operation of the hydride assembling system 10, as needed. Such control advantageously allows for continuous and consistent hydriding of the sensor tube assembly 12, thereby lowering production cost and time, as well as increasing hydrogen concentration uniformity throughout a length and/or volume of the sensor tube assembly 12. These benefits are obtained as a result of the above-described characteristics and parameters determining the amount of hydrogen absorbed and the ability of it to remain absorbed.
A method of making a hydride batch 100 is also provided, as illustrated in
In addition to the general processes described above in conjunction with the method of making a hydride batch 100,
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
