CA2273060A1 - Coaxial coolant fittings - Google Patents
Coaxial coolant fittings Download PDFInfo
- Publication number
- CA2273060A1 CA2273060A1 CA 2273060 CA2273060A CA2273060A1 CA 2273060 A1 CA2273060 A1 CA 2273060A1 CA 2273060 CA2273060 CA 2273060 CA 2273060 A CA2273060 A CA 2273060A CA 2273060 A1 CA2273060 A1 CA 2273060A1
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- Canada
- Prior art keywords
- port
- hose
- flow
- coaxial
- diameter
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/02—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for hoses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
- F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
Coaxial Coolant: Fittings e-BACKGROUND OF THE INVENTION:
The invention relates to coolant lines attached to a natural gas remote pressure regulator in an automobile. The natural gas pressure regulal:or is installed in a cylinder which may be in the trunk or bed of the vehicle or in an underbody location. The coolant lines to the regulator are typically 20 feet long. The purpose of the coolant, which is typically at 195°-250° F, is to warm the regulator.
to SUMMARY OF THE INVENTION:
This invention provides fittings, which allow coolant supply and return lines to be routed coaxially (one inside the other). The coaxial routing reduces heat loss to the environment, simplifies routing, reduces labor cost, reduces material cost, reduces 15 weight, and statistically reduces the likelihood of external hose damage (e.g. half as many hoses presented to the environment).
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be more clearly understood, the preferred embodiment 2o thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Diagram 1 is a schematic view of a prior art coolant supply system for a gas pressure regulator;
Diagram 2 is a schematic view of a coolant supply system according to the present 25 invention;
Figure lA is a side view of a first coaxial tee fitting according to a preferred embodiment of the present invention;
Figure 1B is an end view of the first coaxial tee;
Figure 1 C is a cross-sectional view of the first coaxial tee fitting;
30 Figure 1 D is a cross-sectional view of the first coaxial tee fitting showing the joint assembly;
Figure 2A is a side view of a second coaxial tee fitting according to a preferred embodiment of the present invention;
Figure 2B is an end view of the second coaxial tee fitting;
Figure 2C is a cross-sectional view of the second coaxial tee fitting;
Figure 2D is a cross-sectional view of the second coaxial tee fitting showing the joint assembly;
Fig. 3A is a bottom view of a coaxial manifold according to a preferred embodiment of the present invention;
Fig. 3B is a side view of a coaxial manifold according to the preferred embodiment;
Fig. 3C is a cross-sectional view of a coaxial manifold according to the preferred embodiment;
Fig. 3D is a cross-sectional view of a coaxial manifold according to the preferred embodiment showing the joint assembly;
Fig. 4 is a cross-sectional view of a coaxial manifold according to an alternative embodiment of the present invention;
Fig. 5 is a cross-sectional view of a coaxial tee sized for a 3/g" ID hose and l/4" OD tube;
Fig. 6 is a cross-sectional view of a coaxial tee sized for a 3/8" ID hose and 5/16" OD tube;
and Fig. 7 is a cross-sectional view of a hose sized for a 3/g" x 5/16" tee.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For convenience, the description refers to automotive applications for the invention.
However, those skilled in the art will appreciate that there are number of other applications of the present invention, and such applications are within the scope of this invention.
The fittings according to the present invention may be made of injection molded plastic, cast metals, or machined from bar stock. In the preferred embodiment, the fittings parts are used as molded (or cast) with no additional machining. While the figures show the configuration for plastic fittings, a person skilled i:n the art could modify the design to accommodate casting methods, and such variations are within the scope of this invention.
Preferably, the inner fluid line is made of plastic and is permanently joined to the fittings by gluing or solvent welding at the time of assembly. The outer fluid line is preferably a conventional rubber hose, sealed to the fittings using conventional hose clamps. For most applications, some slight leakage between the 2 fluid paths is permissible, and thus it is not necessary to perfectly seal one path from the other.
Diagram 1 depicts a typical prior art application. Coolant flow to and from the vehicle's heater core is typically routed through 5/8" inside diameter ("ID") rubber hose (not shown). In order to channel coolant flow to the remote natural gas regulator 003, plastic tees 001 and 002 are inserted in the coolant flow. Smaller rubber hoses (typically 3/8") 004 are routed between the tees and the regulator. The lines 004 are typically 20 feet long. The routing of the coolant inside the regulator (not shown) can be accomplished in accordance with a number of known configurations and is not a part of this invention.
Diagram 2 provides an overview of the present invention. A "coaxial tee"
fitting 200 is instead connected to tees 001 and 002. Port 210 receives the input flow from tee 002 while port 220 returns the outlet flow to tee 001. lPort 230 is a co-axial port, with 2o separate coaxial lines directing flow to and from tlne regulator 003. The exterior hose 232 is shown, and would typically have the same outside diameter ("OD") as hoses 004 in Diagram 1. A second (internal) fluid line, not shown in Diagram l, runs inside hose 232 and serves to separate the "supply" and "return" flow paths. A new manifold fitting 300 terminates the coaxial lines at the regulator, separating the supply from the return flow so that the regulator is heated. As before, the routing of the coolant inside the regulator is not shown. Thus, this invention simplifies the routing and reduces the surface area of coolant hose. By reducing the surface area, less heat is lost, and the statistical likelihood of hose damage is reduced. By simplifying the routing, labor, material cost, and weight, are reduced.
Figure 1 A shows an exterior side view of a coaxial, tee 100. Tee 100 is comprised of a body 101, SAE hose barbs 102, and clamping sectiions 103. The left-hand port serves as the inlet port.
Figure 1 B shows an exterior end view of tee 100. As can be seen, the upper port serves as the outlet port. The remaining port handles flow in both directions. The supply flow (out to the regulator) occurs in the smaller diameter as shown. The return flow (from the regulator) occurs in the annular area as shown.
to Figure 1C shows a side cross-sectional view of tee 100. As noted, port 110 serves as the inlet port and has a diameter 111 equal to the outside diameter (OD) of the interior co-axial line 112 (see Figure 1 D). Port 120 serves as the outlet port and has a diameter 121 chosen so as to assure adequate flow in the transition from the annular flow section (see 133 in Figure 1 D) of port 130 into the cylindrical flow area of port 120.
Coaxial port 130 has a diameter 131 chosen so as to assure that the area of the flow annulus is as required. Diameter 131 continues to point 132, which is its intersection with diameter 121. Diameter 131 could be extended further to the: left, if desired.
Figure 1D shows a side cross-sectional view of the joint assembly. Rubber hoses 114 2o and 122 are attached to ports 110 and 120, and are preferably clamped with known conventional hose clamps. The other ends of hose 114 and 122 connect to tees 002 and 001 (respectively) in Diagram 2. Hose 132 connects to outlet port 130 and is clamped with a conventional clamp. In a typical application, all three hoses are 3/8"
ID rubber coolant hose (typ .69" OD). Tube 112 is placed inside hose 132 and carries the supply flow to the regulator. Tube 112 is preferably a thin-wall plastic tube. Tube 112 is permanently joined to tee 100 at the time of assembly, by known means such as gluing or solvent welding. The permanent attachment ensurE;s that tube 112 cannot be pulled out of its bore by bending the hose assembly (such withdrawal would provide a flow short-circuit, reducing or eliminating flow to the regulator).
Figure 2A shows an exterior side view of a second. coaxial tee 200. Tee 200 is comprised of a body 201, SAE hose barbs 202, and clamping sections 203.
Figure 2B shows an exterior end view of tee 200. As can be seen, the upper port serves as the outlet port and the bottom port serves as the inlet port. . The remaining port handles flow in both directions. 'The supply flow (out to the regulator) occurs in the smaller diameter as shown. The return flow (from the regulator) occurs in the annular area as shown (233 in Figure 2D).
l0 Figure 2C shows a side cross-sectional view of tee 200. As noted, Port 210 serves as the inlet port and has a diameter 211 which is equal to or greater than the ID of tube 212 (see Figure 2D). Port 220 serves as the outlet port and has a diameter 221 chosen so as to assure adequate flow in the transition from the annular flow section of port 230 into the cylindrical flow area of port 220. Coaxial port 230 has a diameter 231 chosen so as to assure that the area of the flow annulus is as required. Diameter 231 continues to point 232, which is its intersection with diameter 221. Diameter 214 is equal to the OD of tube 212. Diameter 213 is equal to the ID of tube 212.
Figure 2D shows a side cross-sectional view of the joint assembly. Rubber hoses 214 and 222 are attached to ports 210 and 220, and are preferably clamped with known conventional hose clamps. The other ends of hose 214 and 222 connect to tees 002 and 001 (respectively) in Diagram 2. Hose 232 connects to outlet port130 and is clamped with a conventional clamp. In a typical application, all three hoses are 3/8"
ID rubber coolant hose (typ. .69" OD). Tube 212 is placed inside hose 232 and carnes the supply flow to the regulator. Tube 212 is preferably a thin-wall plastic tube. Tube 212 is permanently joined to tee 200 at the time of assembly, by known means such as gluing or solvent welding. The permanent attachment ensures that tube 212 cannot be pulled out of its bore by bending the hose assembly (such withdrawal would provide a flow short-circuit, reducing or eliminating flow to the regulator).
Figures 3A and 3B show a first embodiment of a coaxial manifold 300. Manifold 300 is comprised of a body 301, SAE hose barb 302, and clamping section 303. Two through holes 304 are provided for bolts to pass through the manifold 300 and clamp it to the regulator's body. Supply flow out to the regulator and return flow from the regulator occurs as described in detail below.
Figure 3C shows a cross-sectional side view of manifold 300. As noted, Port 310 serves as the supply port and has an ID 311 which is equal to or greater than the ID
of tube 312 (see 3D). The OD of ports 310 and 320 engage like female ports in the regulator body l0 and are sealed by O-rings 340, which reside in O-~..°ing glands 306.
Port 320 serves as the return port and has a diameter 321 chosen so as to assure adequate flow in the transition from the annular flow section of port 330 into the cylindrical flow area of port 320.
Coaxial Port 330 has a diameter 331 chosen so as to assure that the area of the flow annulus is as required. Diameter 331 continues to point 332, which is its intersection 15 with diameter 321. Diameter 334 is equal to the OD of tube 312, and continues to point 333. Point 333 is selected so as to ensure adequate bonding area between the tube and manifold 300. The port then drops to diameter 335, equal to the ID of tube 312, and continues until its intersection with diameter 311.
20 Figure 3D shows a side cross-sectional view of the joint assembly.
Figure 4 shows an alternative embodiment of a manifold 400 with a thermostatic control added. Manifold 400 is generally identical to manifold 300, except as follows.
Manifold 400 is enlarged in area 451, providing a bore 452 fir the thermostat seat 471 to ride in.
25 Thermostat bore 452 intersects port bore 334. The; fit of piston 471 in bore 452 is selected so as to minimize leakage around the barrel of the piston when it is fully seated against stop 454. Spring 472 acts to open piston 4;~1 when the sensed temperature is "cold". A bearing 460 is inserted into bore 452 and is glued or solvent welded to the body 451. An o-ring 461 rides in bore 462, sealing bearing 460 to the shaft 470. Shaft 30 470 is inserted through bearing area 481 of thermostat 480. The thermostat body 480 is presumed to engage a mating cavity in the regulator body, thus sensing regulator body temperature. When the body temperature is high, 'the sensing element 482 (preferably wax) expands, acting against shaft 470, moving piston 471 to its seat, thus shutting off coolant flow. Alternatively, by relocating thermostat sensing element 480, the thermostat could sense either natural gas outlet temperature or coolant temperature.
Various uses may require different flow capacities. The chart below shows a few combinations of hose ID (132, 232,336) and tube (112, 212, 312) ID and OD. The resultant equivalent flow diameters for the supply and return lines are also shown. Only a few of the many possible combinations are shown. Note that for each unique to combination, a minimum diameter for dimension f31 also exists (assuming 131= 231=
331 ). That value is also shown below.
Tube Hose Equiv. ID 131 112 132 Flow Dia.
ID OD ID Sunnly Return min. Example 0.1370.187 0.375 0.128 0.325 .227 0.1800.250 0.375 0.174 0.280 0.304 Fig.S
0.2320.313 0.375 0.209 0.207 0.376 Fig.6 0.1370.187 0.500 0.128 0.464 0.227 0.1800.250 0.500 0.174 0.433 0.304 0.2320.313 0.500 0.209 0.390 0.376 0.2750.375 0.500 0.255 0.330 0.454 0.3150.394 0.500 0.236 0.308 0.459 0.3940.472 0.500 0.261 0.164 0.540 Figure 5 is a cross-sectional side view of a typical application of fitting 100. In this case, the fitting is sized for a 3/8" ID hose (132) and'/4" OD tube 112. Such a fitting would have a flow area equivalent to a .174" diameter tube. Per SAE specifications, the OD of the hose barbs 102 is .430". The bore diameter 131 of .305" is greater than the .304"
minimum shown in the above table. Thus, for this fitting, standard hoses and tubes could be used.
If the equivalent minimum flow diameter of the joint needed to be .207", the above table indicates that a standard 5/16" OD tube and 3/8" IiD would deliver that performance.
However, the fitting would need its diameter 131 to be at least .376". Figure 6 is an example of such a fitting, with 131 equal to .378." With a .035" wall thickness, the fitting's OD at port 130 is .450, and the hose barb OD is .505." Ports 110 and 120 would retain the standard dimensions for a 3/8" hose as noted in Figure 5.
Notably, a standard 3/8" ID rubber hose (132, 232" 336) could not predictably be to installed onto the size of port 130 in Fig. 6 (too tight a fit). Instead, such joints would be accommodated by mandrel forming the hose ends to the larger (.450" ID) size so that they would install properly. The sizing of the hose: ends to fit the port of Fig. 6 is shown in Fig. 7.
The invention relates to coolant lines attached to a natural gas remote pressure regulator in an automobile. The natural gas pressure regulal:or is installed in a cylinder which may be in the trunk or bed of the vehicle or in an underbody location. The coolant lines to the regulator are typically 20 feet long. The purpose of the coolant, which is typically at 195°-250° F, is to warm the regulator.
to SUMMARY OF THE INVENTION:
This invention provides fittings, which allow coolant supply and return lines to be routed coaxially (one inside the other). The coaxial routing reduces heat loss to the environment, simplifies routing, reduces labor cost, reduces material cost, reduces 15 weight, and statistically reduces the likelihood of external hose damage (e.g. half as many hoses presented to the environment).
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be more clearly understood, the preferred embodiment 2o thereof will now be described in detail by way of example, with reference to the accompanying drawings, in which:
Diagram 1 is a schematic view of a prior art coolant supply system for a gas pressure regulator;
Diagram 2 is a schematic view of a coolant supply system according to the present 25 invention;
Figure lA is a side view of a first coaxial tee fitting according to a preferred embodiment of the present invention;
Figure 1B is an end view of the first coaxial tee;
Figure 1 C is a cross-sectional view of the first coaxial tee fitting;
30 Figure 1 D is a cross-sectional view of the first coaxial tee fitting showing the joint assembly;
Figure 2A is a side view of a second coaxial tee fitting according to a preferred embodiment of the present invention;
Figure 2B is an end view of the second coaxial tee fitting;
Figure 2C is a cross-sectional view of the second coaxial tee fitting;
Figure 2D is a cross-sectional view of the second coaxial tee fitting showing the joint assembly;
Fig. 3A is a bottom view of a coaxial manifold according to a preferred embodiment of the present invention;
Fig. 3B is a side view of a coaxial manifold according to the preferred embodiment;
Fig. 3C is a cross-sectional view of a coaxial manifold according to the preferred embodiment;
Fig. 3D is a cross-sectional view of a coaxial manifold according to the preferred embodiment showing the joint assembly;
Fig. 4 is a cross-sectional view of a coaxial manifold according to an alternative embodiment of the present invention;
Fig. 5 is a cross-sectional view of a coaxial tee sized for a 3/g" ID hose and l/4" OD tube;
Fig. 6 is a cross-sectional view of a coaxial tee sized for a 3/8" ID hose and 5/16" OD tube;
and Fig. 7 is a cross-sectional view of a hose sized for a 3/g" x 5/16" tee.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For convenience, the description refers to automotive applications for the invention.
However, those skilled in the art will appreciate that there are number of other applications of the present invention, and such applications are within the scope of this invention.
The fittings according to the present invention may be made of injection molded plastic, cast metals, or machined from bar stock. In the preferred embodiment, the fittings parts are used as molded (or cast) with no additional machining. While the figures show the configuration for plastic fittings, a person skilled i:n the art could modify the design to accommodate casting methods, and such variations are within the scope of this invention.
Preferably, the inner fluid line is made of plastic and is permanently joined to the fittings by gluing or solvent welding at the time of assembly. The outer fluid line is preferably a conventional rubber hose, sealed to the fittings using conventional hose clamps. For most applications, some slight leakage between the 2 fluid paths is permissible, and thus it is not necessary to perfectly seal one path from the other.
Diagram 1 depicts a typical prior art application. Coolant flow to and from the vehicle's heater core is typically routed through 5/8" inside diameter ("ID") rubber hose (not shown). In order to channel coolant flow to the remote natural gas regulator 003, plastic tees 001 and 002 are inserted in the coolant flow. Smaller rubber hoses (typically 3/8") 004 are routed between the tees and the regulator. The lines 004 are typically 20 feet long. The routing of the coolant inside the regulator (not shown) can be accomplished in accordance with a number of known configurations and is not a part of this invention.
Diagram 2 provides an overview of the present invention. A "coaxial tee"
fitting 200 is instead connected to tees 001 and 002. Port 210 receives the input flow from tee 002 while port 220 returns the outlet flow to tee 001. lPort 230 is a co-axial port, with 2o separate coaxial lines directing flow to and from tlne regulator 003. The exterior hose 232 is shown, and would typically have the same outside diameter ("OD") as hoses 004 in Diagram 1. A second (internal) fluid line, not shown in Diagram l, runs inside hose 232 and serves to separate the "supply" and "return" flow paths. A new manifold fitting 300 terminates the coaxial lines at the regulator, separating the supply from the return flow so that the regulator is heated. As before, the routing of the coolant inside the regulator is not shown. Thus, this invention simplifies the routing and reduces the surface area of coolant hose. By reducing the surface area, less heat is lost, and the statistical likelihood of hose damage is reduced. By simplifying the routing, labor, material cost, and weight, are reduced.
Figure 1 A shows an exterior side view of a coaxial, tee 100. Tee 100 is comprised of a body 101, SAE hose barbs 102, and clamping sectiions 103. The left-hand port serves as the inlet port.
Figure 1 B shows an exterior end view of tee 100. As can be seen, the upper port serves as the outlet port. The remaining port handles flow in both directions. The supply flow (out to the regulator) occurs in the smaller diameter as shown. The return flow (from the regulator) occurs in the annular area as shown.
to Figure 1C shows a side cross-sectional view of tee 100. As noted, port 110 serves as the inlet port and has a diameter 111 equal to the outside diameter (OD) of the interior co-axial line 112 (see Figure 1 D). Port 120 serves as the outlet port and has a diameter 121 chosen so as to assure adequate flow in the transition from the annular flow section (see 133 in Figure 1 D) of port 130 into the cylindrical flow area of port 120.
Coaxial port 130 has a diameter 131 chosen so as to assure that the area of the flow annulus is as required. Diameter 131 continues to point 132, which is its intersection with diameter 121. Diameter 131 could be extended further to the: left, if desired.
Figure 1D shows a side cross-sectional view of the joint assembly. Rubber hoses 114 2o and 122 are attached to ports 110 and 120, and are preferably clamped with known conventional hose clamps. The other ends of hose 114 and 122 connect to tees 002 and 001 (respectively) in Diagram 2. Hose 132 connects to outlet port 130 and is clamped with a conventional clamp. In a typical application, all three hoses are 3/8"
ID rubber coolant hose (typ .69" OD). Tube 112 is placed inside hose 132 and carries the supply flow to the regulator. Tube 112 is preferably a thin-wall plastic tube. Tube 112 is permanently joined to tee 100 at the time of assembly, by known means such as gluing or solvent welding. The permanent attachment ensurE;s that tube 112 cannot be pulled out of its bore by bending the hose assembly (such withdrawal would provide a flow short-circuit, reducing or eliminating flow to the regulator).
Figure 2A shows an exterior side view of a second. coaxial tee 200. Tee 200 is comprised of a body 201, SAE hose barbs 202, and clamping sections 203.
Figure 2B shows an exterior end view of tee 200. As can be seen, the upper port serves as the outlet port and the bottom port serves as the inlet port. . The remaining port handles flow in both directions. 'The supply flow (out to the regulator) occurs in the smaller diameter as shown. The return flow (from the regulator) occurs in the annular area as shown (233 in Figure 2D).
l0 Figure 2C shows a side cross-sectional view of tee 200. As noted, Port 210 serves as the inlet port and has a diameter 211 which is equal to or greater than the ID of tube 212 (see Figure 2D). Port 220 serves as the outlet port and has a diameter 221 chosen so as to assure adequate flow in the transition from the annular flow section of port 230 into the cylindrical flow area of port 220. Coaxial port 230 has a diameter 231 chosen so as to assure that the area of the flow annulus is as required. Diameter 231 continues to point 232, which is its intersection with diameter 221. Diameter 214 is equal to the OD of tube 212. Diameter 213 is equal to the ID of tube 212.
Figure 2D shows a side cross-sectional view of the joint assembly. Rubber hoses 214 and 222 are attached to ports 210 and 220, and are preferably clamped with known conventional hose clamps. The other ends of hose 214 and 222 connect to tees 002 and 001 (respectively) in Diagram 2. Hose 232 connects to outlet port130 and is clamped with a conventional clamp. In a typical application, all three hoses are 3/8"
ID rubber coolant hose (typ. .69" OD). Tube 212 is placed inside hose 232 and carnes the supply flow to the regulator. Tube 212 is preferably a thin-wall plastic tube. Tube 212 is permanently joined to tee 200 at the time of assembly, by known means such as gluing or solvent welding. The permanent attachment ensures that tube 212 cannot be pulled out of its bore by bending the hose assembly (such withdrawal would provide a flow short-circuit, reducing or eliminating flow to the regulator).
Figures 3A and 3B show a first embodiment of a coaxial manifold 300. Manifold 300 is comprised of a body 301, SAE hose barb 302, and clamping section 303. Two through holes 304 are provided for bolts to pass through the manifold 300 and clamp it to the regulator's body. Supply flow out to the regulator and return flow from the regulator occurs as described in detail below.
Figure 3C shows a cross-sectional side view of manifold 300. As noted, Port 310 serves as the supply port and has an ID 311 which is equal to or greater than the ID
of tube 312 (see 3D). The OD of ports 310 and 320 engage like female ports in the regulator body l0 and are sealed by O-rings 340, which reside in O-~..°ing glands 306.
Port 320 serves as the return port and has a diameter 321 chosen so as to assure adequate flow in the transition from the annular flow section of port 330 into the cylindrical flow area of port 320.
Coaxial Port 330 has a diameter 331 chosen so as to assure that the area of the flow annulus is as required. Diameter 331 continues to point 332, which is its intersection 15 with diameter 321. Diameter 334 is equal to the OD of tube 312, and continues to point 333. Point 333 is selected so as to ensure adequate bonding area between the tube and manifold 300. The port then drops to diameter 335, equal to the ID of tube 312, and continues until its intersection with diameter 311.
20 Figure 3D shows a side cross-sectional view of the joint assembly.
Figure 4 shows an alternative embodiment of a manifold 400 with a thermostatic control added. Manifold 400 is generally identical to manifold 300, except as follows.
Manifold 400 is enlarged in area 451, providing a bore 452 fir the thermostat seat 471 to ride in.
25 Thermostat bore 452 intersects port bore 334. The; fit of piston 471 in bore 452 is selected so as to minimize leakage around the barrel of the piston when it is fully seated against stop 454. Spring 472 acts to open piston 4;~1 when the sensed temperature is "cold". A bearing 460 is inserted into bore 452 and is glued or solvent welded to the body 451. An o-ring 461 rides in bore 462, sealing bearing 460 to the shaft 470. Shaft 30 470 is inserted through bearing area 481 of thermostat 480. The thermostat body 480 is presumed to engage a mating cavity in the regulator body, thus sensing regulator body temperature. When the body temperature is high, 'the sensing element 482 (preferably wax) expands, acting against shaft 470, moving piston 471 to its seat, thus shutting off coolant flow. Alternatively, by relocating thermostat sensing element 480, the thermostat could sense either natural gas outlet temperature or coolant temperature.
Various uses may require different flow capacities. The chart below shows a few combinations of hose ID (132, 232,336) and tube (112, 212, 312) ID and OD. The resultant equivalent flow diameters for the supply and return lines are also shown. Only a few of the many possible combinations are shown. Note that for each unique to combination, a minimum diameter for dimension f31 also exists (assuming 131= 231=
331 ). That value is also shown below.
Tube Hose Equiv. ID 131 112 132 Flow Dia.
ID OD ID Sunnly Return min. Example 0.1370.187 0.375 0.128 0.325 .227 0.1800.250 0.375 0.174 0.280 0.304 Fig.S
0.2320.313 0.375 0.209 0.207 0.376 Fig.6 0.1370.187 0.500 0.128 0.464 0.227 0.1800.250 0.500 0.174 0.433 0.304 0.2320.313 0.500 0.209 0.390 0.376 0.2750.375 0.500 0.255 0.330 0.454 0.3150.394 0.500 0.236 0.308 0.459 0.3940.472 0.500 0.261 0.164 0.540 Figure 5 is a cross-sectional side view of a typical application of fitting 100. In this case, the fitting is sized for a 3/8" ID hose (132) and'/4" OD tube 112. Such a fitting would have a flow area equivalent to a .174" diameter tube. Per SAE specifications, the OD of the hose barbs 102 is .430". The bore diameter 131 of .305" is greater than the .304"
minimum shown in the above table. Thus, for this fitting, standard hoses and tubes could be used.
If the equivalent minimum flow diameter of the joint needed to be .207", the above table indicates that a standard 5/16" OD tube and 3/8" IiD would deliver that performance.
However, the fitting would need its diameter 131 to be at least .376". Figure 6 is an example of such a fitting, with 131 equal to .378." With a .035" wall thickness, the fitting's OD at port 130 is .450, and the hose barb OD is .505." Ports 110 and 120 would retain the standard dimensions for a 3/8" hose as noted in Figure 5.
Notably, a standard 3/8" ID rubber hose (132, 232" 336) could not predictably be to installed onto the size of port 130 in Fig. 6 (too tight a fit). Instead, such joints would be accommodated by mandrel forming the hose ends to the larger (.450" ID) size so that they would install properly. The sizing of the hose: ends to fit the port of Fig. 6 is shown in Fig. 7.
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2273060 CA2273060A1 (en) | 1999-05-27 | 1999-05-27 | Coaxial coolant fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2273060 CA2273060A1 (en) | 1999-05-27 | 1999-05-27 | Coaxial coolant fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2273060A1 true CA2273060A1 (en) | 2000-11-27 |
Family
ID=29589070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2273060 Abandoned CA2273060A1 (en) | 1999-05-27 | 1999-05-27 | Coaxial coolant fittings |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2273060A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047502A (en) * | 2012-12-24 | 2013-04-17 | 成都市新筑路桥机械股份有限公司 | Multi-channel rotary joint capable of being positioned |
-
1999
- 1999-05-27 CA CA 2273060 patent/CA2273060A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047502A (en) * | 2012-12-24 | 2013-04-17 | 成都市新筑路桥机械股份有限公司 | Multi-channel rotary joint capable of being positioned |
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