Abstract:
Abstract: The Re-Corable Coaxial Hose System allows temperature control to be added around material-carrying tubing in both new and existing dispensing systems. The jacketing system seals around the material-carrying tube and allows a thermal transfer fluid to be circulated in the resulting annular space so as to change the temperature of the material being dispensed. Because the system is comprised of a series of tubing and hoses it is flexible and can be routed around corners and through wire tracks and can be used in both manual and robotic applications. Because the seals around the material-carrying tube can be released and subsequently re-sealed, the internal material-carrying tube can be replaced, defined as “re-coring” the hose assembly.

Description:
BACKGROUND 
       [0001]    The present invention relates in general to hose systems and jackets. More particularly the present invention pertains to a flexible temperature control hose systems. 
         [0002]    In many dispensing operations it is necessary to hold the liquid being dispensed at a specific temperature in order to stabilize characteristics such as viscosity. This is generally done with a traditional heat exchanger, often of plate, tube-in-tube or shell-and-tube construction. While reasonably effective in changing the temperature of the material being dispensed, the heat exchanger is traditionally located a distance from the actual point at which the fluid is dispensed. The heat exchanger is generally of a rigid construction and therefore not amenable to use in a motion application. Motion is often required in order to place the fluid in its proper location(s) and this generally results in the use of tubing or hose material to convey the material from the heat exchanger to the moving “gun” or other dispensing apparatus. 
         [0003]    As the fluid moves through the tubing or hose, the temperature established in the heat exchanger is influenced by the ambient air surrounding the hose. The magnitude of that influence is directly related to the difference between the outlet temperature of the heat exchanger and the ambient temperature. In general, though the outlet temperature of the heat exchanger may be consistent, ambient temperature values generally vary from morning to evening, resulting in a varying rate of change in temperature. 
         [0004]    Tubing insulation is often employed in an attempt to minimize the impact of changes in ambient temperature. However, it is important to note that, while insulation will slow the migration of thermal energy, it will not stop it. This can be addressed to some extent with air conditioning systems to control ambient temperature, but this is both expensive and difficult to implement when the area to be controlled is large (like a factory setting) or the desired material dispensing temperature is significantly above or below the normal human ambient environment of 65° F.-85° F. 
         [0005]    In previous applications known to the inventors (Dunning and Cline, et. al., U.S. Pat Nos. 5,287,913 and 5,363,907), the fluid conveying hose is encased in a larger hose and temperature conditioned thermal transfer fluid circulated through the annular space formed between the outside of the inner hose and the inside of the outer hose. This configuration, in essence, creates a flexible tube-in-tube heat exchanger useful for controlling the temperature of the fluid being dispensed. 
         [0006]    Some of the most significant issues with this configuration are the means necessary to create the coaxial configuration. These are generally comprised of a series of blocks and connections that transition from the original conveyance to this flexible coaxial configuration. These systems are often bulky and heavy. This is deleterious to both manually and robotically applied systems. Such heavy bulky systems can create fatigue in operators and require added force and energy to accomplish robotic applications. Additionally, the transition from the original conveyance to this flexible coaxial configuration generally involves gaps, threads, or the like which can trap material and create problems with the dispensing system that include, but are not limited to clogged nozzles, contamination, etc. The contamination issue is often significant in this type of system when it is necessary to switch from one material being dispensed to another and the two materials are not chemically compatible. One non-limiting example would be changing from one point to another where contamination between colors or chemistries could significantly alter the quality of the finished product. In such instances it is common practice to change the hoses or tubes conveying the material to eliminate the possibility of contamination. With the aforementioned configuration, the coaxial hose must be changed out or rebuilt, either of which requires significant time and expense. 
         [0007]    Thus it would be desirable to provide a system or device to that could provide thermal insulation to hoses and tubing while eliminating or minimizing problems associated with systems employed to date. 
       SUMMARY 
       [0008]    Disclosed herein is hose system configured to provide or add temperature control around material-carrying tubing in both new and existing fluid dispensing systems. The hose system disclosed herein seals around the material-carrying tube and allows a thermal transfer fluid to be circulated in the resulting annular space so as to change the temperature of the material being dispensed. Because the system is comprised of a series of tubes and hoses, it is flexible and can be routed around corners and through wire tracks and can be used in both manual and robotic applications. Because the seals around the material-carrying tube can be released and subsequently resealed, the internal material-carrying tube can be replaced, defined as “re-coring” the hose assembly. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The figures and drawings of the invention included with and within this disclosure are as follows: 
           [0010]      FIG. 1  is an orthographic view of an embodiment of the hose assembly disclosed herein; 
           [0011]      FIG. 2  is an orthographic view of an embodiment of a block assembly that can be used (in pairs) in association with an embodiment of the hose assembly as disclosed herein; and 
           [0012]      FIG. 3  is a cross sectional view of the block assembly of  FIG. 2 . 
       
    
    
     DETAILED DESCRIPTION 
       [0013]    The hose assembly system disclosed herein provides a device that can surround a material-carrying tubing in a manner that minimizes or eliminated transitions in said material carrying tube. The associated material-carrying tube can be either an existing material-conveying tube already present in a system or can be new material-conveying tubing. 
         [0014]    The hose assembly system as disclosed herein includes at least one outer tube body and at least one compressible elastomeric seal or seal system that seals around an associated material-carrying tube to form an annular space through which a thermal transfer fluid can be circulated in order to accomplish a specified temperature control function. Because these elastomeric seals can be released and subsequently resealed around the associated material-carrying tube, said internal material-carrying tube can be replaced, defined as “re-coring” the hose assembly. 
         [0015]    The device disclosed herein significantly reduces the time and expense associated with replacing the material conveying tubing. The outer tubing in the device disclosed herein is composed of lightweight, flexible tubing or hose material as well as suitable blocks composed of a suitable structural material, including but not limited to aluminum or plastic. The configuration permits the assembly to be routed around corners and through the same path followed by the unjacketed material conveying tube and presents only a small increase in weight, dimensions, and little resistance, making it ideal for both manual and robotic applications. 
         [0016]    The device disclosed herein can be used in various industries that require the conveying of fluids at a controlled temperature and is applicable to processes 
         [0017]    A non-limiting embodiment of the device  10  disclosed herein is shown in  FIG. 1 . Here we can see an outer hose assembly  12  in place around the material conveying tube  14 . For purposes of illustration, the outer hose assembly  12  and associated material conveying tube are shown in broken form in order to illustrate the internal relationship of material conveying tube  14  and outer hose assembly  12 . The coaxial orientation of the outer hose assembly  12  around the material conveying tube  14  forms an annular space  16  between the outside diameter of the material conveying tube  12  and the inside diameter of the outer hose assembly  10  through which thermal transfer fluid can be circulated to change and/or condition the temperature of the fluid contained in the material conveying tube  12 . 
         [0018]    The break in the center of  FIG. 1  is representational only, intended to show coaxial configuration and the resulting annular space. Both internal and external tubing/hose sections are continuous throughout the length of the device  10  and the assembly may be constructed in any length required. The outer hose assembly  12  includes at least one outer hose jacket member  18  connected to at least one block assembly  20  in fluid tight engagement to the associated hose jacket member  18 . In various embodiments and applications, it is contemplated that the device  10  will include block assemblies  20 ,  20 ′ located at first and second ends  22 ,  24  of the associated outer hose jacket member  18 . 
         [0019]    The length of the material conveying tube  14  is set by the distance between its connection points within the dispensing system. The length of the outer hose assembly  12  may be determined by specific thermal requirements of the associated fluid application system but will always be of a length less than that of the material conveying tube or conduit  14 . 
         [0020]    The device  10  composed of the outer hose assembly  12  hose can be configured to provide a re-corable coaxial hose system relative to the material conveying hose or conduit  14  and the associated fluid dispensing system. 
         [0021]    The device  10  can include at least one suitably configured block assembly positioned at either the first or second end  22 ,  24  of the outer hose jacket  18  or both. An embodiment of the block assembly  20 ,  20 ′ is depicted orthographically in  FIG. 2  and in cross sectional view in  FIG. 3 . The block assembly  20 ,  20 ′ can be machined, molded or otherwise formed from a suitable material. The material of choice can be a material exhibiting at least some insulative characteristics. Non-limiting examples of such materials include various metals such as aluminum, steel, copper, various polymeric materials, ceramic materials and the like. It is contemplated that each block assembly  20 ,  20 ′ include a central body portion  26  that can be produced from a single block of material. Each block assembly  20 ,  20  can also include a thermal fluid conditioning barb  28 ,  28 ′ insertably positioned in the central body portion  26 . The thermal fluid conditioning barb  28 ,  28 ′ will be discussed in greater detail subsequently. 
         [0022]    The central body portion  26  of the block assembly or assemblies  20 ,  20 ′ can have any suitable configuration. In the embodiment depicted in the drawing figures, the central body portion  26  is composed of an elongated member that can be configured as a generally cylindrical element. The central body portion  26  defines a through shaft  30  that extends from a first end  32  to a second end  34 . The first end  32  is configured with a suitable tube engaging surface that can engage the interior of the region of the outer hose jacket member  18  in a fluid tight manner. In the embodiment depicted in the drawing figures the tube engaging region proximate to the first end  32  of the central body portion  26  is configured with at least one barb  36 . The at least one barb  36  can be pressed into an associated region of the outer hose jacket member  18  and sealed in a suitable manner. Non-limiting examples of suitable sealing means include either mechanical clamping means and/or adhesive means. 
         [0023]    The though shaft  30  defined in the central body portion  26  is configured to define an internal passage through which the material conveying tube  14  as well as thermal transfer fluid can both pass. 
         [0024]    The block assembly  20 , 20 ′ can also include at least one threaded or press-fit port region  38  located at the second end of the  34  of the central body portion  26  into which a liquid-tight fitting  40  can be installed. The fitting seal  40  is configured with a central shaft  45  that can be oriented coaxial to the shaft  30  defined in the central body  26  when the device  10  is in the use position. This configuration facilitate the passage of the thermal transfer fluid into or out of the annular space formed between the outside diameter of the material conveying tube  14  and the inside diameter of the outer hose jacket  18  hose disclosed herein. 
         [0025]    In the embodiment depicted in the drawing figures, the block assembly  20 ,  20 ′ also includes an externally threaded end  42  located proximate to the second end of the central body portion  26  at an orientation opposite the at least one barb  36 . The externally threaded end  42  also defines an internal region  44  having a concave taper  46  into which a compatibly tapered elastomeric seal  40  can be fitted and onto which a threaded cap  46  can be screwed to force the tapered end  46  of the elastomeric seal  40  into the mating taper  44  in the end  34  of central body portion  26 , compressing the central shaft  45  of the seal  40  from a first internal diameter that permits insertion of the material conveying conduit  14  therein to a second internal diameter to seal around the outside diameter of the material conveying tube  14 . 
         [0026]    The central body portion  26  also includes a side shaft  48  oriented perpendicular to the shaft  30  in fluid communication therewith. The side shaft is located in the central body portion  26  at a location between the first end  32  and the elastomeric seal  40 . The side shaft  48  can be configured to engage a suitable thermal fluid conditioning barb  28 ,  28 ′ in fluid tight mating engagement with the central body  26 . In the embodiment depicted in the drawing figures, the side shaft  48  is configured with and internally oriented threaded surface  50  that can matingly engage a suitable outwardly threaded surface defined on the thermal fluid conditioning barb  28 ,  28 ′. 
         [0027]    The thermal fluid conditioning barb  28 ,  28 ′ can be suitably configured to transfer suitable thermal conditioning fluid from an associated source to the device  10 . The thermal conditioning barb  26 ,  26 ′ can include a suitable barb region  52 ,  52 ′ that is located distal to the outwardly threaded region (not shown) that matingly engages the side shaft  48 . The thermal conditioning fluid barb also has a shaft  54  defined therein extending from the barb end to the opposed end. In the embodiment depicted in the drawing figures, the thermal conditioning barb  26 ,  26 ′ also is configured with a suitable elbow  56  that oriented the shaft in a suitable angle, such as a 90 degree angle in the drawing figures. The barb region  52 ,  52 ′ engages a suitable thermal conditioning fluid conveying conduit (not shown) to convey thermal conditioning fluid to or away from the device  10 . 
         [0028]    In order to assemble the system as disclosed herein, a material conveying hose  14  is cut to the proper length as determined either by the material conveying tube or the required thermal length, whichever is shorter. A hose jacket member  18  is cut to a sufficient length. At least one block assembly  26 ,  26 ′ is installed in each end of the hose jacket member  18  by pressing the associated barb fitting  36  into the associated end of the hose jacket member  18  and securing it with an adhesive or a mechanical band clamp such as a screw, Oetiker or other type of fastening member in order to form a liquid tight seal with the internal diameter of the hose jacket member  18 . The tapered elastomeric seal  40  is inserted into the taper  44  formed in the end  38  of each block assembly  26 ,  26 ′ and loosely retained by threading the compression cap  48  over it and onto the threaded end  42  of the block assembly  26 ,  26 ′. The diameter of the hole through the elastomeric seal is determined by the material conveying tube  14  against which it is designed to seal and is large enough to provide a clearance hole when the seal is not compressed. An appropriate fitting for the thermal transfer fluid connection such as thermal conditioning fluid barb  26 ,  26 ′ is installed into the port on the side of each block assembly  26 ,  26 ′ as indicated. Specifics as to the size and type of connection are to be determined by the flow rate and thermal transfer fluid required as set forth from the thermal design calculations for the associated system. The resulting assembly is the Re-Corable Coaxial Hose. 
         [0029]    To install the Re-Corable Coaxial Hose in position, one end of the material conveying tube  14  can be removed from its connection point in the associated dispensing system and fed through the hole through the elastomeric seal  40 . The Re-Corable Coaxial Hose is slid over the material conveying tube  14  until it passes through the hole through the elastomeric seal on the other end. The material conveying tube  14  can, then, be reconnected to the associated dispensing system. The Re-Corable Coaxial Hose is then slid into position and the compression cap on each end is tightened to compress the elastomeric seal onto the outside diameter of the material conveying tube  14  so as to be watertight, but not collapse the tube. The thermal transfer fluid circulation system is then connected to the fittings on the Re-Corable Coaxial Hose device  10  and the air can be bled from the system. The installation is then complete. 
         [0030]    It is important to note that in many dispensing systems, a multiple component compound is dispensed. In these situations, the Re-Corable Coaxial Hose can be used in multiples, one for each component. These can all be connected to the same thermal transfer fluid circulation system to operate at the same temperature, or they can be connected to separate systems to allow the components to be maintained at different temperatures prior to mixing. In this type of system, yet another Re-Corable Coaxial Hose can be used to control the temperature of the multiple-component material after it is mixed. A non-limiting example would be materials such as epoxies where cooling is employed to control cure rate which can be accelerated by the exothermic reaction of the epoxy after mixing. 
         [0031]    To “Re-Core” the assembly, the compression caps  48  are loosened and the thermal transfer fluid is drained from the Re-Corable Coaxial Hose Assembly  10 . The material conveying tube  14  is disconnected from the dispensing system and pulled out through the center of the Re-Corable Coaxial Hose Assembly  10  after which a new material conveying tube is pushed through in its place and reconnected to the associated dispensing system. The Re-Corable Coaxial Hose assembly  10  is then repositioned and the compression caps  48  on each end is tightened to compress the associated elastomeric seal  40  onto the outside diameter of the new material conveying tube  14  so as to be watertight, but not collapse the tube. The thermal transfer fluid circulation system is then restarted and the air purged from the system. The “Re-Coring” process is now complete. 
         [0032]    While the invention has been described in connection with certain embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.