CA2656973A1 - Heating apparatus for installation on rooftop end of sewer vent pipe - Google Patents
Heating apparatus for installation on rooftop end of sewer vent pipe Download PDFInfo
- Publication number
- CA2656973A1 CA2656973A1 CA2656973A CA2656973A CA2656973A1 CA 2656973 A1 CA2656973 A1 CA 2656973A1 CA 2656973 A CA2656973 A CA 2656973A CA 2656973 A CA2656973 A CA 2656973A CA 2656973 A1 CA2656973 A1 CA 2656973A1
- Authority
- CA
- Canada
- Prior art keywords
- heater body
- internal passage
- heating apparatus
- vent pipe
- heating
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 134
- 238000009434 installation Methods 0.000 title claims abstract description 14
- 230000037361 pathway Effects 0.000 claims description 22
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241000006869 Halone Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/122—Pipe-line systems for waste water in building
-
- 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
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
- F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
- E03C1/122—Pipe-line systems for waste water in building
- E03C1/1222—Arrangements of devices in domestic waste water pipe-line systems
- E03C1/1225—Arrangements of devices in domestic waste water pipe-line systems of air admittance valves
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/0404—Drainage on the roof surface
- E04D13/0409—Drainage outlets, e.g. gullies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/58—Heating hoses; Heating collars
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/04—Roof drainage; Drainage fittings in flat roofs, balconies or the like
- E04D13/0404—Drainage on the roof surface
- E04D13/0409—Drainage outlets, e.g. gullies
- E04D2013/0418—Drainage outlets, e.g. gullies with de-icing devices or snow melters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
- H05B2214/02—Heaters specially designed for de-icing or protection against icing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Resistance Heating (AREA)
Abstract
A heating apparatus for installation on a top end of a sewer vent pipe features a body having an internal passage with a stop defined at a position therealong between open top and bottom ends. A cross-sectional area of the internal passage is less at this position than at the open bottom end, which is sized for snug receipt of the top end of the sewer vent pipe. The cross-sectional area of the internal passage, at all positions therealong, is no less than a cross sectional area bound by an inner diameter of the sewer vent pipe. The heater body can be seated atop the vent pipe with no external fasteners and does not restrict the vent pipe opening. A heating element loops around the interior passage proximate the open top and depends downward toward the open bottom inside the vent pipe, heating from both outside and inside the pipe.
Description
HEATING APPARATUS FOR INSTALLATION ON ROOFTOP END OF SEWER
VENT PIPE
FIELD OF THE INVENTION
This invention relates generally to heating devices for preventing the clogging of sewer vent pipes that occurs in cold-whether climates due to ice and snow buildup at the rooftop exhaust ends of these pipes.
BACKGROUND OF THE INVENTION
Sewer vent pipes are vertically oriented pipes made of, for example, acrylonitrile butadiene styrene (ABS) or polyvinyl chloride (PVC), installed to extend upwardly through the roof structures of buildings to an open exhaust end, allowing sewer gases, fumes or odors from the waste water system of a building to be vented outside the building. A well known problem in cold weather climates is that sub-zero temperatures in the outside environment will promote freezing of water vapour as it exits the sewer vent pipe, causing a build up of ice on the interior wall surface of the pipe. Alone or compounded with by snow-fall accumulation, this build up may eventually close off and completely plug the pipe, thereby preventing the intended venting of the waste water system and potentially causing backing up of undesirable gases or fumes into the building interior. A number of prior art devices have been developed with the intention of solving this problem.
U.S. Patent No. 4,524,262 of Meyer teaches an electric sewer vent line defroster intended for use on a plastic vent pipe. The defroster is of a multi-piece construction requiring a relatively complex rooftop installation, including modification of the existing sewer vent pipe to cut away the top end thereof. The defroster uses an electric heater externally mounted to a section of metal pipe that replaces the removed top portion of the existing plastic vent pipe.
U.S. Patent No. 5,214,266 of Halone, Jr. teaches an electric heating attachment for a sewer vent pipe that can be easily installed by lowering the bottom end of a vertically depending rod carrying electrical heat tape into the open top end of the sewer vent pipe until lateral support arms projecting horizontally from the rod rest atop the pipe end. While easy to install, the device blocks a significant portion of the pipe's open top end.
U.S. Patent No. 6,097,008 of Mahin teaches another electric device for preventing ice build up on a sewer vent pipe. The device is produced in a single size and the reference teaches the use of a separately acquired coupler to effect installation of the device on a sewer vent pipe of a particular size. The device uses heat cable coiled in an annular space between inner and outer sleeves to heat space inside the inner sleeve that communicates end-to-end with the sewer vent pipe through the coupler.
U.S. Patent Application Publication No. 2006/0057950 of Heise, in one embodiment, teaches a heat vent cap assembly installed in place of a removed section of the existing sewer vent pipe at the passage thereof through a building's roof structure. This device requires modification of the existing sewer vent line and uses an electric heating element coiled around an inner sleeve or cylinder.
The device may suffer from a higher level of installation difficulty, as it is installed to pass through the existing roof structure and is of a greater diameter than the previously installed section of pipe that it replaces. Another embodiment uses a hydronic heating element placed in communication with the vent pipe interior by addition of a cap assembly to the top end of the pipe or modification of the pipe to pass the cable thereinto.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having open top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body having a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body, the open bottom end of the heater body having an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof and the cross-sectional area of the internal passage, at all positions between the open top and bottom ends of the heater body, being no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and an electrical heating device supported by the heater body and being arranged on a same side of the stop as the open top end of the heater body for connection to an electrical power source, a heating element of the electrical device being positioned in or adjacent the internal passage for heating thereof.
VENT PIPE
FIELD OF THE INVENTION
This invention relates generally to heating devices for preventing the clogging of sewer vent pipes that occurs in cold-whether climates due to ice and snow buildup at the rooftop exhaust ends of these pipes.
BACKGROUND OF THE INVENTION
Sewer vent pipes are vertically oriented pipes made of, for example, acrylonitrile butadiene styrene (ABS) or polyvinyl chloride (PVC), installed to extend upwardly through the roof structures of buildings to an open exhaust end, allowing sewer gases, fumes or odors from the waste water system of a building to be vented outside the building. A well known problem in cold weather climates is that sub-zero temperatures in the outside environment will promote freezing of water vapour as it exits the sewer vent pipe, causing a build up of ice on the interior wall surface of the pipe. Alone or compounded with by snow-fall accumulation, this build up may eventually close off and completely plug the pipe, thereby preventing the intended venting of the waste water system and potentially causing backing up of undesirable gases or fumes into the building interior. A number of prior art devices have been developed with the intention of solving this problem.
U.S. Patent No. 4,524,262 of Meyer teaches an electric sewer vent line defroster intended for use on a plastic vent pipe. The defroster is of a multi-piece construction requiring a relatively complex rooftop installation, including modification of the existing sewer vent pipe to cut away the top end thereof. The defroster uses an electric heater externally mounted to a section of metal pipe that replaces the removed top portion of the existing plastic vent pipe.
U.S. Patent No. 5,214,266 of Halone, Jr. teaches an electric heating attachment for a sewer vent pipe that can be easily installed by lowering the bottom end of a vertically depending rod carrying electrical heat tape into the open top end of the sewer vent pipe until lateral support arms projecting horizontally from the rod rest atop the pipe end. While easy to install, the device blocks a significant portion of the pipe's open top end.
U.S. Patent No. 6,097,008 of Mahin teaches another electric device for preventing ice build up on a sewer vent pipe. The device is produced in a single size and the reference teaches the use of a separately acquired coupler to effect installation of the device on a sewer vent pipe of a particular size. The device uses heat cable coiled in an annular space between inner and outer sleeves to heat space inside the inner sleeve that communicates end-to-end with the sewer vent pipe through the coupler.
U.S. Patent Application Publication No. 2006/0057950 of Heise, in one embodiment, teaches a heat vent cap assembly installed in place of a removed section of the existing sewer vent pipe at the passage thereof through a building's roof structure. This device requires modification of the existing sewer vent line and uses an electric heating element coiled around an inner sleeve or cylinder.
The device may suffer from a higher level of installation difficulty, as it is installed to pass through the existing roof structure and is of a greater diameter than the previously installed section of pipe that it replaces. Another embodiment uses a hydronic heating element placed in communication with the vent pipe interior by addition of a cap assembly to the top end of the pipe or modification of the pipe to pass the cable thereinto.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having open top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body having a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body, the open bottom end of the heater body having an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof and the cross-sectional area of the internal passage, at all positions between the open top and bottom ends of the heater body, being no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and an electrical heating device supported by the heater body and being arranged on a same side of the stop as the open top end of the heater body for connection to an electrical power source, a heating element of the electrical device being positioned in or adjacent the internal passage for heating thereof.
Preferably the electrical heating element loops around the internal passage of the heater body on the same side of the stop as the open top end of the heater body.
Preferably the electrical heating element loops around the internal passage of the heater body in an annular cavity between an outer periphery of the heater body and an inner periphery of the heater body defining boundaries of the internal passage.
Preferably at least a portion of the heating element projects into the internal passage of the heater body.
Preferably the electrical heating element, from where it loops around the interior passage of the heater body within the annular cavity, projects into the interior space of heater body from the annular cavity.
Preferably the heater body comprises an inner sleeve fitted within and fixed to an outer sleeve, the stop projecting inward from an inner surface of the outer sleeve and the inner sleeve being disposed on the same side of the stop as the open top end of the heater body, the annular cavity being defined between the inner and outer sleeves.
The stop may comprise a ridge formed integrally on the outer sleeve.
Preferably a bottom end of the inner sleeve is seated against the stop.
Preferably a pathway connecting the annular cavity to the internal passage accommodates passage of the heater element from the annular cavity into the internal passage.
Preferably the pathway is sized to prevent passage of more than a single pass only of the heater element therethrough.
Preferably sides of the pathway spaced apart are obliquely sloped relative to the axis of the internal passage to encourage the heater element to curve 5 around the axis of the internal passage as it extends thereinto from the annular cavity.
The sides of the pathway may converge along a direction parallel to the axis of the internal passage toward the open top end of the heater body.
According to a second aspect of the invention there is provided a heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having an internal passage that extends therethrough and is open at top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body being arranged for connection to the sewer vent at the top end thereof to communicate the interior passage of the heater body with an interior of the sewer vent pipe; and an electrical heating device comprising a heating element that loops around the interior passage of the heater body proximate the open top end thereof and depends downward toward the open bottom end of the heater body within the interior passage thereof from where the heating element loops around the interior passage for receipt of a bottom end of the heating element inside the sewer vent pipe.
Preferably the heating element comprises heat cable.
Preferably the heating element is self-regulating heat cable.
Preferably the heating device comprises a power supply cord connected to the heating element.
Preferably the power supply cord is connected to the heating element inside the heater body.
Preferably the heating device is of an elongated structure passing into the heater body through an aperture in an outer wall thereof and features a bend inside the heater body to prevent withdrawal of the heating device therefrom through the aperture.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a perspective view of a sewer vent pipe heating apparatus in accordance with the present invention.
Figure 2 is a schematic sectional view of a building illustrating the heating apparatus installed at the top end of a sewer vent pipe projecting vertically through the building's roof structure.
Figure 3 is a schematic cross sectional view taken along a vertical plane containing the central longitudinal axis of the sewer vent pipe during installation of the heating apparatus thereon.
Preferably the electrical heating element loops around the internal passage of the heater body in an annular cavity between an outer periphery of the heater body and an inner periphery of the heater body defining boundaries of the internal passage.
Preferably at least a portion of the heating element projects into the internal passage of the heater body.
Preferably the electrical heating element, from where it loops around the interior passage of the heater body within the annular cavity, projects into the interior space of heater body from the annular cavity.
Preferably the heater body comprises an inner sleeve fitted within and fixed to an outer sleeve, the stop projecting inward from an inner surface of the outer sleeve and the inner sleeve being disposed on the same side of the stop as the open top end of the heater body, the annular cavity being defined between the inner and outer sleeves.
The stop may comprise a ridge formed integrally on the outer sleeve.
Preferably a bottom end of the inner sleeve is seated against the stop.
Preferably a pathway connecting the annular cavity to the internal passage accommodates passage of the heater element from the annular cavity into the internal passage.
Preferably the pathway is sized to prevent passage of more than a single pass only of the heater element therethrough.
Preferably sides of the pathway spaced apart are obliquely sloped relative to the axis of the internal passage to encourage the heater element to curve 5 around the axis of the internal passage as it extends thereinto from the annular cavity.
The sides of the pathway may converge along a direction parallel to the axis of the internal passage toward the open top end of the heater body.
According to a second aspect of the invention there is provided a heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having an internal passage that extends therethrough and is open at top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body being arranged for connection to the sewer vent at the top end thereof to communicate the interior passage of the heater body with an interior of the sewer vent pipe; and an electrical heating device comprising a heating element that loops around the interior passage of the heater body proximate the open top end thereof and depends downward toward the open bottom end of the heater body within the interior passage thereof from where the heating element loops around the interior passage for receipt of a bottom end of the heating element inside the sewer vent pipe.
Preferably the heating element comprises heat cable.
Preferably the heating element is self-regulating heat cable.
Preferably the heating device comprises a power supply cord connected to the heating element.
Preferably the power supply cord is connected to the heating element inside the heater body.
Preferably the heating device is of an elongated structure passing into the heater body through an aperture in an outer wall thereof and features a bend inside the heater body to prevent withdrawal of the heating device therefrom through the aperture.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate an exemplary embodiment of the present invention:
Figure 1 is a perspective view of a sewer vent pipe heating apparatus in accordance with the present invention.
Figure 2 is a schematic sectional view of a building illustrating the heating apparatus installed at the top end of a sewer vent pipe projecting vertically through the building's roof structure.
Figure 3 is a schematic cross sectional view taken along a vertical plane containing the central longitudinal axis of the sewer vent pipe during installation of the heating apparatus thereon.
Figure 4 is a schematic cross sectional view of the heating apparatus and pipe of Figure 3 taken along line IV - IV thereof.
Figure 5 is an overhead plan view of a spacing ring of a body or housing of the heating apparatus.
Figure 6 is a bottom plan view of the spacing ring.
Figure 7 is a side elevational view of the spacing ring Figure 8 is schematic cross-sectional view of an outer sleeve of the body or housing as taken along line VIII - VIII of Figure 4, but with a heating element and inner sleeve of the apparatus removed for illustrative clarity.
Figure 9 is a schematic cross-section view of the housing of Figure 8 as taken along line IX - IX thereof, but with the spacing ring removed.
Figure 10 is schematic cross-sectional view of the housing of the heating apparatus similar to Figure 8, but with the ring removed.
DETAILED DESCRIPTION
Figure 1 shows a heating apparatus 10 that is configured as a one-piece unit to easily install atop a sewer vent pipe projecting vertically upward through the rooftop of a building without any separate fasteners or couplers and to provide ice-preventing heating at both the effective top end of the sewer vent pipe, as defined by the installed unit, and within the previously existing length of sewer vent pipe directly below the installed unit. The unit features a heater body or housing 12 having an internal passage 14 extending fully therethrough along a vertical axis 16 to define an open top end 18 and open bottom end 20 of the housing at opposite ends of the internal passage 14. An electric heating element 22 coils around the internal passage of the heater body 12 within an upper portion of thereof before projecting into the internal passage 14 in order to depend downward through the open bottom end 20 of the housing into the sewer vent pipe when the heater body is installed thereon. The top end of the heating element 22 from which it coils downward inside the heater body is conductively coupled to a power supply cable 24 that extends outward through an outer peripheral wall of the housing 12 proximate the open top end 18 for connection to a suitable electric power source.
Figure 2 shows the heating apparatus 10 installed on the sewer vent pipe 200 extending vertically upward through the roof structure 202 of a building 204 in a conventional manner so as to position a top exhaust end of the pipe 200 at a distance above the roofline at the pipe's position therealong. Figure 3 shows a schematic cross section of the heating apparatus 10 and the building's existing sewer vent pipe 200 once the heater body 12 is fitted thereon. The heater body features an outer sleeve 26 that closes around the central vertical axis 16 of the heater body and presents cylindrical outer surface 26a over its full length along this axis. This length of the outer sleeve 26 defines the full height of the heater body 12, extending fully from the open top end 18 to the open bottom end 20. At a central position along the length of the outer sleeve 26, an annular ridge is defined to project inward from the rest of the outer sleeve 26 a short distance toward, without reaching, the heater body's central axis 16. Below this ridge 28, the inside of the outer sleeve features a lower cylindrical surface 26b extending concentrically about the heater body's central axis 16, giving the internal passage 14 of the heater body 12 a uniform circular cross-section normal to the body's central axis 16 from the open bottom end 20 to the ridge 28. The round annular ridge 28 acts to reduce the diameter and thus area of the internal passage's circular cross-section at the ridge's position along the body's central axis 16 and presents a flat horizontal shoulder projecting inward from the portion of the outer sleeve below it.
As shown in Figures 3 and 4, the uniform diameter of the internal passage 14 below the ridge 28, as defined by the uniform diameter of the outer sleeve's lower inside cylindrical surface 26b below the ridge 28, is sized to fit snugly around the outside diameter of the existing sewer vent pipe 200. The horizontal shoulder defined at the bottom of the ridge 28 by the projection thereof inward from the lower inside cylindrical surface 26b of the outer sleeve toward the body's axis 16 thus defines a stop against which the annular upper end face of the sewer vent pipe 200 abuts when the open bottom end 20 of the outer sleeve 26 is fitted over the pipe's top end and slid down the pipe. The heater body 12 thus sits atop the sewer vent pipe at the ridge 28 and is held laterally stationary by the snug friction fit of the outer sleeve's inside lower cylindrical surface 26b against the cylindrical outer surface of the pipe wall.
Opposite the ridge's flat bottom face that defines the horizontal shoulder against which the top end face of the vent pipe 200 abuts with the heater apparatus installed, the ridge features a flat top face that defines a horizontal ledge parallel to the shoulder. An inner assembly 32 fixed to the outer sleeve 26 sits atop this ledge and is composed of an inner sleeve 34 and a spacing ring 36 fixed to the bottom of the inner sleeve 34. The ring 36 and the inner sleeve 34 close about the central axis 16 of the body concentric with the outer sleeve 26 and ridge 28 thereon.
A flat bottom face of the spacing ring 36 abuts face-to-face against the horizontal top face or ledge of the ridge 28 and an opposing flat top face of the spacing ring 36 abuts face-to-face against the flat annular horizontal bottom face of the inner sleeve 24. With reference to Figure 4, the outer diameter of the circular ring 36 exceeds the 5 outer diameter of the sleeve's circular bottom end, but the inner diameter of the ring 36 equals that of the inner sleeve's annular bottom end so that inner peripheral surfaces of the inner sleeve and spacing ring are flush. An outer peripheral surface of the spacing ring 36 fits against the inner surface of the outer sleeve where the ring 36 sits atop the ridge 28 over most of the ring's perimeter, the inner surface of the 10 outer sleeve having the same uniform diameter most of the way around the body's central axis 16 at the portion 26c of the inner surface spanning the height or thickness of the ring immediately above the ridge as it does at the lower cylindrical portion 26b of the outer sleeve's inner surface below the ridge 28. From immediately above the spacing ring 36 to a short distance below the open top end 18 of the housing, the outer sleeve 26 is cylindrical, but thinner than at all other locations therealong. Immediately above this thinner portion 26d, the outer sleeve 26 returns to the same thickness as immediately above and below the ridge 28, and is uniform in this thickness right to the open top end 18 of the housing 12.
With the outer sleeve's cylindrical outer surface, these sections of different uniform thicknesses make the inner surface of the outer sleeve recessed from the remainder of this inner surface at the thinnest portion 26d of the outer sleeve 26, and define an internally flanged upper end 26e of the outer sleeve 26.
Figure 5 is an overhead plan view of a spacing ring of a body or housing of the heating apparatus.
Figure 6 is a bottom plan view of the spacing ring.
Figure 7 is a side elevational view of the spacing ring Figure 8 is schematic cross-sectional view of an outer sleeve of the body or housing as taken along line VIII - VIII of Figure 4, but with a heating element and inner sleeve of the apparatus removed for illustrative clarity.
Figure 9 is a schematic cross-section view of the housing of Figure 8 as taken along line IX - IX thereof, but with the spacing ring removed.
Figure 10 is schematic cross-sectional view of the housing of the heating apparatus similar to Figure 8, but with the ring removed.
DETAILED DESCRIPTION
Figure 1 shows a heating apparatus 10 that is configured as a one-piece unit to easily install atop a sewer vent pipe projecting vertically upward through the rooftop of a building without any separate fasteners or couplers and to provide ice-preventing heating at both the effective top end of the sewer vent pipe, as defined by the installed unit, and within the previously existing length of sewer vent pipe directly below the installed unit. The unit features a heater body or housing 12 having an internal passage 14 extending fully therethrough along a vertical axis 16 to define an open top end 18 and open bottom end 20 of the housing at opposite ends of the internal passage 14. An electric heating element 22 coils around the internal passage of the heater body 12 within an upper portion of thereof before projecting into the internal passage 14 in order to depend downward through the open bottom end 20 of the housing into the sewer vent pipe when the heater body is installed thereon. The top end of the heating element 22 from which it coils downward inside the heater body is conductively coupled to a power supply cable 24 that extends outward through an outer peripheral wall of the housing 12 proximate the open top end 18 for connection to a suitable electric power source.
Figure 2 shows the heating apparatus 10 installed on the sewer vent pipe 200 extending vertically upward through the roof structure 202 of a building 204 in a conventional manner so as to position a top exhaust end of the pipe 200 at a distance above the roofline at the pipe's position therealong. Figure 3 shows a schematic cross section of the heating apparatus 10 and the building's existing sewer vent pipe 200 once the heater body 12 is fitted thereon. The heater body features an outer sleeve 26 that closes around the central vertical axis 16 of the heater body and presents cylindrical outer surface 26a over its full length along this axis. This length of the outer sleeve 26 defines the full height of the heater body 12, extending fully from the open top end 18 to the open bottom end 20. At a central position along the length of the outer sleeve 26, an annular ridge is defined to project inward from the rest of the outer sleeve 26 a short distance toward, without reaching, the heater body's central axis 16. Below this ridge 28, the inside of the outer sleeve features a lower cylindrical surface 26b extending concentrically about the heater body's central axis 16, giving the internal passage 14 of the heater body 12 a uniform circular cross-section normal to the body's central axis 16 from the open bottom end 20 to the ridge 28. The round annular ridge 28 acts to reduce the diameter and thus area of the internal passage's circular cross-section at the ridge's position along the body's central axis 16 and presents a flat horizontal shoulder projecting inward from the portion of the outer sleeve below it.
As shown in Figures 3 and 4, the uniform diameter of the internal passage 14 below the ridge 28, as defined by the uniform diameter of the outer sleeve's lower inside cylindrical surface 26b below the ridge 28, is sized to fit snugly around the outside diameter of the existing sewer vent pipe 200. The horizontal shoulder defined at the bottom of the ridge 28 by the projection thereof inward from the lower inside cylindrical surface 26b of the outer sleeve toward the body's axis 16 thus defines a stop against which the annular upper end face of the sewer vent pipe 200 abuts when the open bottom end 20 of the outer sleeve 26 is fitted over the pipe's top end and slid down the pipe. The heater body 12 thus sits atop the sewer vent pipe at the ridge 28 and is held laterally stationary by the snug friction fit of the outer sleeve's inside lower cylindrical surface 26b against the cylindrical outer surface of the pipe wall.
Opposite the ridge's flat bottom face that defines the horizontal shoulder against which the top end face of the vent pipe 200 abuts with the heater apparatus installed, the ridge features a flat top face that defines a horizontal ledge parallel to the shoulder. An inner assembly 32 fixed to the outer sleeve 26 sits atop this ledge and is composed of an inner sleeve 34 and a spacing ring 36 fixed to the bottom of the inner sleeve 34. The ring 36 and the inner sleeve 34 close about the central axis 16 of the body concentric with the outer sleeve 26 and ridge 28 thereon.
A flat bottom face of the spacing ring 36 abuts face-to-face against the horizontal top face or ledge of the ridge 28 and an opposing flat top face of the spacing ring 36 abuts face-to-face against the flat annular horizontal bottom face of the inner sleeve 24. With reference to Figure 4, the outer diameter of the circular ring 36 exceeds the 5 outer diameter of the sleeve's circular bottom end, but the inner diameter of the ring 36 equals that of the inner sleeve's annular bottom end so that inner peripheral surfaces of the inner sleeve and spacing ring are flush. An outer peripheral surface of the spacing ring 36 fits against the inner surface of the outer sleeve where the ring 36 sits atop the ridge 28 over most of the ring's perimeter, the inner surface of the 10 outer sleeve having the same uniform diameter most of the way around the body's central axis 16 at the portion 26c of the inner surface spanning the height or thickness of the ring immediately above the ridge as it does at the lower cylindrical portion 26b of the outer sleeve's inner surface below the ridge 28. From immediately above the spacing ring 36 to a short distance below the open top end 18 of the housing, the outer sleeve 26 is cylindrical, but thinner than at all other locations therealong. Immediately above this thinner portion 26d, the outer sleeve 26 returns to the same thickness as immediately above and below the ridge 28, and is uniform in this thickness right to the open top end 18 of the housing 12.
With the outer sleeve's cylindrical outer surface, these sections of different uniform thicknesses make the inner surface of the outer sleeve recessed from the remainder of this inner surface at the thinnest portion 26d of the outer sleeve 26, and define an internally flanged upper end 26e of the outer sleeve 26.
The inner sleeve 34 has a cylindrical portion 34a that is of uniform wall thickness, uniform inner diameter and uniform outer diameter and extends upward from the spacing ring 36 at the inner sleeve's bottom end to the top end of the thinnest cylindrical portion 26d of the outer sleeve, where the inner sleeve then increases in thickness, keeping the same inner diameter but increasing its outer diameter to match the outer diameter of the spacing ring 36, thus forming an externally flanged upper end 34b of the inner sleeve 34. At this top end 34b of the inner sleeve 34, the outer surface thereof therefore fits against the inner surface 26b of the outer sleeve at the internally flanged top end 26e thereof. The heater body 12 defined by the assembly of the inner and outer sleeves and spacing ring features an annular cavity 38 defined in the heater body and extending around the internal passage thereof. The annular cavity features a rectangular cross section in vertical planes passing radially through the heater body's central axis 16, the opposing vertical sides of this cross section being defined by the thinner portions 26d, 34a of the inner and outer sleeves 26, 34 aligned along the body's central axis 16, the horizontal top of this cross section being defined by the mating flanges of the top end portions 34b, 26e of the inner and outer sleeves and the horizontal bottom of this cross section being defined by the mating of the spacing ring's outer surface and corresponding portion 26c of the outer sleeve's inner surface above the stop ridge 28.
With reference to Figure 3, the insulated power supply cord 24 extends from outside the heater body 12 to the annular cavity 38 defined therein through a hole or aperture 40 provided in the thin portion of the outer sleeve wall 26 to communicate directly with the cavity 38 at or near the top end thereof. The power supply cord is connected directly to the heating element 22 inside the annular cavity 38 after a significant bend in the power supply cord at the entry thereof to the cavity to begin following a circular path defined concentrically around the internal passage 14 of the heater body by the annular cavity 37. From its connection to the power supply cable 24, the heating element 22 coils downward around the internal passage of the heater body within the annular cavity 37, preferably making at least the two complete loops around the internal passage shown in the illustrated embodiment.
As shown in Figures 3 and 4, the portions of the heater body 12 from the ridge upward to the top end 18 of the heater body at the flanged top ends 34b, 26e of the sleeves effectively defines a short of extension of the sewer vent pipe 200 when fitted thereon. The coiling of the heating element 22 around the internal passage 14 of the heater body 12 provides ice-preventing heating at this new effective top end of the vent pipe 200, but as shown, the heating element then continues downward within the existing vent pipe itself to provide heating further down the resulting vent line, preferably down to levels actually within the building itself below the roofline (see Figure 2).
Figures 9 and 10 show the outer sleeve 26, including the ridge 28 formed integrally therewith in the illustrated embodiment, in isolation. A
trapezoidal cut-away 42 is formed in the outer sleeve 26 at a single position about the central axis 16 of the heater body, recessing into the ring-surrounding portion 26c of the outer sleeve's inner surface 26 immediately above the ridge 28 and extending vertically from the ridge 28 to the thin walled portion 26d of the outer sleeve that defines a respective half of the annular cavity 38 in the assembled heater body 12.
The depth to which the cut-away portion 42 is recessed from the ring surrounding portion 26c of the outer sleeve's inner surface is equal to the depth of the recess defined at the thinnest portion 26d of the outer sleeve so that the cut-away portion 42 is flush with the inner surface of the outer sleeve's thinnest portion 26d.
The sloped sides 42a of the cut-away portion 42 converge upwardly from the ridge 28 to the outer sleeve's thinnest portion 26d so that the trapezoidal cut-away's base is defined by the ledge formed by the ridge 28 at the bottom of the cut-away.
Figures 5 to 7 show the spacing ring 36 in isolation. The ring 36 also features a trapezoidal cut-away 44 formed at the ring's outer surface 36a. A
top portion of the ring's cut-away 44 is only recessed into the ring's outer surface 36a so as to not extend fully therethrough toward the ring's center in a radial direction. A
bottom portion of the ring's cut-away 44 however does extend radially through the ring 36. This leaves an integral connecting portion 46 at the top end face 36b of the ring that completes the ring's circular enclosure around the central axis 16 of the heater body 12 at the inside surface 36c of the ring, while the outside surface 36a of the ring is broken over the full height of the trapezoidal cut-away. The ring's cut-away 44, like the outer sleeve's cut-away 42, is trapezoidal as viewed from a vertical plane and features upwardly converging sides 44a. The two cut-aways share the same height and the same width, each vertically spanning a respective one of the equally high spacing ring 36 and ring surrounding portion 26c of the outer sleeve 26.
Figure 8 shows the outer sleeve 26 and spacing ring 36 assembled, but without the inner sleeve 34, heating element 22 and power supply cable 24.
With reference to Figure 3, the insulated power supply cord 24 extends from outside the heater body 12 to the annular cavity 38 defined therein through a hole or aperture 40 provided in the thin portion of the outer sleeve wall 26 to communicate directly with the cavity 38 at or near the top end thereof. The power supply cord is connected directly to the heating element 22 inside the annular cavity 38 after a significant bend in the power supply cord at the entry thereof to the cavity to begin following a circular path defined concentrically around the internal passage 14 of the heater body by the annular cavity 37. From its connection to the power supply cable 24, the heating element 22 coils downward around the internal passage of the heater body within the annular cavity 37, preferably making at least the two complete loops around the internal passage shown in the illustrated embodiment.
As shown in Figures 3 and 4, the portions of the heater body 12 from the ridge upward to the top end 18 of the heater body at the flanged top ends 34b, 26e of the sleeves effectively defines a short of extension of the sewer vent pipe 200 when fitted thereon. The coiling of the heating element 22 around the internal passage 14 of the heater body 12 provides ice-preventing heating at this new effective top end of the vent pipe 200, but as shown, the heating element then continues downward within the existing vent pipe itself to provide heating further down the resulting vent line, preferably down to levels actually within the building itself below the roofline (see Figure 2).
Figures 9 and 10 show the outer sleeve 26, including the ridge 28 formed integrally therewith in the illustrated embodiment, in isolation. A
trapezoidal cut-away 42 is formed in the outer sleeve 26 at a single position about the central axis 16 of the heater body, recessing into the ring-surrounding portion 26c of the outer sleeve's inner surface 26 immediately above the ridge 28 and extending vertically from the ridge 28 to the thin walled portion 26d of the outer sleeve that defines a respective half of the annular cavity 38 in the assembled heater body 12.
The depth to which the cut-away portion 42 is recessed from the ring surrounding portion 26c of the outer sleeve's inner surface is equal to the depth of the recess defined at the thinnest portion 26d of the outer sleeve so that the cut-away portion 42 is flush with the inner surface of the outer sleeve's thinnest portion 26d.
The sloped sides 42a of the cut-away portion 42 converge upwardly from the ridge 28 to the outer sleeve's thinnest portion 26d so that the trapezoidal cut-away's base is defined by the ledge formed by the ridge 28 at the bottom of the cut-away.
Figures 5 to 7 show the spacing ring 36 in isolation. The ring 36 also features a trapezoidal cut-away 44 formed at the ring's outer surface 36a. A
top portion of the ring's cut-away 44 is only recessed into the ring's outer surface 36a so as to not extend fully therethrough toward the ring's center in a radial direction. A
bottom portion of the ring's cut-away 44 however does extend radially through the ring 36. This leaves an integral connecting portion 46 at the top end face 36b of the ring that completes the ring's circular enclosure around the central axis 16 of the heater body 12 at the inside surface 36c of the ring, while the outside surface 36a of the ring is broken over the full height of the trapezoidal cut-away. The ring's cut-away 44, like the outer sleeve's cut-away 42, is trapezoidal as viewed from a vertical plane and features upwardly converging sides 44a. The two cut-aways share the same height and the same width, each vertically spanning a respective one of the equally high spacing ring 36 and ring surrounding portion 26c of the outer sleeve 26.
Figure 8 shows the outer sleeve 26 and spacing ring 36 assembled, but without the inner sleeve 34, heating element 22 and power supply cable 24.
Referring additionally to Figures 3 and 4, the trapezoidal cut-aways 42, 44 of the outer sleeve 26 and spacing ring 36 are aligned with one another about the central axis 16 of the heater body with the spacing ring 36 placed atop the ridge 28.
The two cut-sways thus communicate directly with one another to define an enclosed pathway 48 interconnecting the annular cavity 38 with the portion of the heater body's internal passage 14 defined beneath the spacing ring 36. As shown in Figures 3 and 4, this is where the heating element 22 passes from the annular cavity 38 into the heater body's internal passage 14 so as to depend downward into the sewer vent pipe 200 when the heating apparatus 10 is installed. The bottom of the annular cavity 38 is closed around the heater body's central axis 16 and internal passage 14, except where the two cut-aways 42, 44 cooperate to form this pathway 48. From where it is coiled within the annular cavity 38, the heating element bends downward and passes through the communicating trapezoidal cut-aways, downward past the connecting portion 46 of the spacing ring 36 and then inward into the internal passage 14, passing beneath the connecting portion 46 of the spacing ring 36 where the ring's cut-away 44 extends completely through the ring 36 in a radial direction.
As shown in Figure 4, a horizontal cross-section of the pathway formed by the aligned cut-aways 42, 44 at the top end of the pathway is of an area sized to only accommodate a single pass of the heating element 22 therethrough. The heating element sits against a respective one of the sloped sides of the mating trapezoidal cut-aways as it passes downward, giving it a tendency to coil downward along the inner periphery of the sewer vent pipe 200 around the pipe's central longitudinal axis, which is coincident with the heater body's central axis 16 when the heating apparatus 10 is installed. As shown in the figures, the slope of the sides of the pathway's trapezoidal vertical cross section is preferably steeper than the angle at which the heating element 22 is coiled around the internal passage 14 within the 5 annular cavity 38, giving the heater element 22 a more tightly packed coiling within the annular cavity 38 than within the sewer vent pipe 200.
The heating element 22 is preferably a length of self-regulating heat cable, which is known to those of skill in the art and thus not described in detail herein. For ease of illustration, details of the heat cable's construction have been 10 omitted in the drawings, which instead schematically show a cable of uniform cross-section within the cross-sectional view of the heating apparatus. As shown in Figure 2, the power supply cable 24 may be fitted with a conventional male electrical plug 50 at an end thereof opposite the heating element 22 outside the heater body 12 for connection to the female socket end 52 of an extension cord 54 outside the building.
The two cut-sways thus communicate directly with one another to define an enclosed pathway 48 interconnecting the annular cavity 38 with the portion of the heater body's internal passage 14 defined beneath the spacing ring 36. As shown in Figures 3 and 4, this is where the heating element 22 passes from the annular cavity 38 into the heater body's internal passage 14 so as to depend downward into the sewer vent pipe 200 when the heating apparatus 10 is installed. The bottom of the annular cavity 38 is closed around the heater body's central axis 16 and internal passage 14, except where the two cut-aways 42, 44 cooperate to form this pathway 48. From where it is coiled within the annular cavity 38, the heating element bends downward and passes through the communicating trapezoidal cut-aways, downward past the connecting portion 46 of the spacing ring 36 and then inward into the internal passage 14, passing beneath the connecting portion 46 of the spacing ring 36 where the ring's cut-away 44 extends completely through the ring 36 in a radial direction.
As shown in Figure 4, a horizontal cross-section of the pathway formed by the aligned cut-aways 42, 44 at the top end of the pathway is of an area sized to only accommodate a single pass of the heating element 22 therethrough. The heating element sits against a respective one of the sloped sides of the mating trapezoidal cut-aways as it passes downward, giving it a tendency to coil downward along the inner periphery of the sewer vent pipe 200 around the pipe's central longitudinal axis, which is coincident with the heater body's central axis 16 when the heating apparatus 10 is installed. As shown in the figures, the slope of the sides of the pathway's trapezoidal vertical cross section is preferably steeper than the angle at which the heating element 22 is coiled around the internal passage 14 within the 5 annular cavity 38, giving the heater element 22 a more tightly packed coiling within the annular cavity 38 than within the sewer vent pipe 200.
The heating element 22 is preferably a length of self-regulating heat cable, which is known to those of skill in the art and thus not described in detail herein. For ease of illustration, details of the heat cable's construction have been 10 omitted in the drawings, which instead schematically show a cable of uniform cross-section within the cross-sectional view of the heating apparatus. As shown in Figure 2, the power supply cable 24 may be fitted with a conventional male electrical plug 50 at an end thereof opposite the heating element 22 outside the heater body 12 for connection to the female socket end 52 of an extension cord 54 outside the building.
15 Alternatively, the power supply cord 24 may plug directly into an electrical outlet installed outside the building or be hardwired to the building's electrical system. The power supply cord 24 may pass through the roof structure 202 of the building in a sealed weatherproof manner through the roof flashing for releasable coupling to an electrical outlet or hardwiring to the building's electrical system within the building interior, for example within the attic space of a home or dwelling.
A prototype of the present invention has been produced for use on a sewer vent pipe of 3-inch internal diameter and 1/4-inch wall thickness. An off the shelf ABS pipe coupling of 3.5-inch inner diameter and 5.25-inch length and having already having a '/4-inch high internal stop ridge 28 integrally formed centrally therealong was internally lathed fully around its central axis above the stop ridge to define the outer sleeve 26 with the thin-walled section 26d and inwardly flanged top end 26e. A cut-away having a parallelogram vertical cross-section, rather than the trapezoidal cross-section of the illustrated embodiment, was grinded away from the inside surface of the coupler from the ridge 28 to the thin-walled portion 26d and a hole was drilled through this thin portion of the coupler's cylindrical wall to form the power supply cord aperture 40. The ring of the prototype was cut from an ABS
pipe of equal inner and outer diameters to the sewer vent pipe to define a ring of approximately 3/8-inch height, and then grinded at the outside surface to form a cut-away of parallelogram vertical cross-section extending part way through the ring wall over a top half of its height or thickness and extending fully through the ring over the bottom half thereof. The ring was then inserted to sit atop the ridge 28 with the two cut-aways aligned about the coupler's central axis to defined the single heating element pathway past the ring. The heating element 22 was then passed through the aperture 40 until the power supply cord extended approximately two inches into the outer sleeve, whereafter the power supply cord was bent inside the upper sleeve at the aperture 40 to coil the heating element twice around the central axis of the coupler against the inside surface thereof before having its lower end being passed downwardly through the pathway to below the spacing ring 36. Prior to such installation, the heating cable was coated with heat shrink tubing from its free end to a position along the heating cable a short distance past where the cable would later transition from the annular space to the interal passage of the heater body through the pathway defined between the ring and the outer sleeve to better protect heat cable.
The inner sleeve 34 was formed from a 1-1/8-inch length of pipe of the same inner and outer diameters as the vent pipe and ring that was externally lathed over most of its length from its bottom end upward 7/8 of an inch, thereby leaving a 1/4-inch high externally flanged upper end 34b having an outer diameter sized to fit against the inwardly directed '/4-inch high flange 26e left above the internally lathed portion 26d of the outer sleeve 26. This inner sleeve 34 was then inserted through the open top end of the outer sleeve to sit atop the ring 36 to defined the inner wall of the annular cavity 38 and close off the heating element 22 inside the resulting heater body between the inner and walls thereof defined by the inner and outer sleeves, which where then adhered together at their flanged upper ends.
The parallel sloped sides of the parallelogram cut-aways of the prototype were angled at forty-five degrees to vertical, but other oblique acute angles may be used. The illustrated embodiment uses trapezoidal cut-aways having sloped sides converging at opposite forty-five degree angles to vertical. This trapezoidal shape allows either side to have the heating element placed thereagainst so that the coiling of the heating element around the central axis 16 can be made the same above and below the spacing ring 36 regardless of which direction it is coiled above the ring during assembly, thereby avoiding a sharp bend in the heating cable to change direction. The parallelogram shape of the prototype cut-aways required that the heating coil be coiled in the direction dictated by the slope of the cut-away sides above the ring in order to avoid such a direction change, but similarly provided the coil-encouraging slope of the heating element as it projects into the internal passage of the heater body above the open exhaust end of the sewer vent pipe.
Turning back now to the illustrated embodiment, the equal inner diameters of the sewer vent pipe 200 and the inner sleeve 24 and the projecting of the ridge 28 inward from the cylindrical bottom portion of the outer sleeve by a distance less than the pipe wall thickness of the sewer vent pipe provide an extension of the vent pipe of equal diameter and equal cross-sectional area to the projecting portion of the vent pipe extending upward from the roof. The internal passage extending through the heater body 12 can be thought of as divided into three cylindrical sections each having a diameter, and thus cross-sectional area perpendicular to the shared axis of the heater body and vent pipe, that are no less than the inner diameter and cross-sectional area, respectively, of the vent pipe. The cylindrical boundary of the internal passage 14 at these three sections are defined by respective ones of the cylindrical bottom portion 26b of the outer sleeve 26, the annular stop ridge 28 and the cylindrical inner surface of the sleeve assembly formed by the inner sleeve 34 and spacing ring 36.
The installation of the heater body on the top exhaust end of the vent pipe 200 is thus not only simple, requiring only sliding placement of the heater body over this top end of the vent pipe with the lower portion of the heating element 22 depending down the vent pipe in a coil-like manner, but also does not restrict the cross-sectional area or flow at the vent pipe's upper end. The heating apparatus also benefits from the combination of both a wrap-around heating element arrangement adjacent the top of the pipe-extending heater body and a direct pipe-interior heating arrangement depending downward inside the existing vent pipe below the heater body to maximize prevention of freezing and clogging of the pipe's internal sewer gas exhaust passage. It will be appreciated that the seat-in-place and non-restrictive structure of a heater body having an inward projecting stop and an inner passage equal to or greater than the inside cross-sectional area of the pipe may be used with different arrangements of heating elements, and that likewise a combinative external wrap-around and internally-depending heating element arrangement outside and inside the heater body's internal passage may be used with heater bodies that do not provide direct seat-in-place installation on the pipe and restriction-free extension of the pipe .
The heater body is preferably formed of ABS or PVC plastic, materials commonly used for sewer vent pipes, but may instead feature constructions using other materials. The stop within the internal passage through the heater body need not necessary be defined by an integral annular ridge. For example, with reference to Figure 3, without the integral ridge, the ring-defined bottom flange of the inner assembly 32 could instead define a non-integral ridge fixed to the outer sleeve at its inners surface to extend inward toward the central axis and define the stop.
In such an embodiment, the heating element could extend radially inward through the gap in the ring above the bottom face thereof toward the central axis and then bend downward past the bottom of the ring. This would avoid pinching of the heating element 22 between the ring bottom end the vent pipe top and would allow the same flat seating of the housing atop the vent pipe as the illustrated embodiment.
The downward extending pathway between the ring and outer sleeve could be replaced with a horizontal hole passing through the inner sleeve 34 slightly above the ring 36 so that the heating element instead projects into the internal passage 14 above the bottom flange of the inner assembly and then bends downward into the vent pipe 200 below. The heating element need not necessarily depend downward in the pipe 5 in a coiled fashion up against the pipe's inner walls surface, and may alternatively simply hang freely within the vent pipe (see Figure 1 where the heating element simply hangs downward through the open bottom of the heating apparatus).
The inner assembly need not necessarily have the two piece ring and sleeve structure, and may be produced as a single integral part having externally 10 flanged upper and lower ends around which the heating element can be pre-wrapped before insertion, provided that the depth of the recess defined at the exterior of the inner sleeve between the flanges is sufficient to receive the heating element wraps fully therein. With reference to Figure 3, this may involve having the full width of the annular cavity defined solely by this outer recess in the inner 15 assembly, in which case no inward extending flange 26e would be included on the outer sleeve 26.
The illustrated embodiment provides a high level of tamper resistance by making the annular cavity or chamber substantially fully closed and preventing easy withdrawal of the heating element therefrom through the generally right angle 20 bend in the power supply cord where it enters the cavity. The sloping of the pathway, which may be at angles other than the forty-five degree angle of the prototype, at a steeper angle than the coiling of the heater element within the annular cavity also forms a slight bend at the transition of the heating element from the cavity to the internal passage of the heater body that resists pulling of the heating element out of the cavity. However, it will be appreciated that such relatively full and complete enclosure of the space housing the heating element around the internal passage is not necessarily required. The bottom end of the housing for fitting over the vent pipe and the stop defined within the internal passage need not necessarily be a full and continuous cylinder and fully-closing ring about the central axis 16. The stop for example may be formed of distinct ledges or shoulders projecting inward from the inside of the outer sleeve at spaced positions about the axis 16, just as the bottom of the housing could be distinct flaps or sections projecting downward below the stop fit snugly against the vent pipe outer periphery at spaced locations thereabout, preferably still presenting concave inner surfaces with curved dimensions suitable for flush engagement to the pipe's outer periphery.
As a result, the internal passage need not necessarily be fully surrounded around the central axis at each location along the passage, and so the cross-sectional area or diameter of the internal passage at any point therealong may instead be thought of in terms of a circular cross section normal to the central axis with a circumference determined by elements of the housing that are each radially equidistant to the central axis, whether integral with or separate from one another at this location along the passage.
In the illustrated embodiment, the diameter and cross-sectional area of the internal passage at the ridge 28 are slightly greater than above the ridge because the projecting length of the ridge 28 inward toward the central axis 16 is less than the wall thickness of the pipe 200. It will be appreciated that that diameter and cross-sectional of internal passage of the heater body instead may be uniform from the bottom of the stop to the open top end of the passage. Also, the diameter and cross-section of the internal passage 14 may be larger than those of the vent pipe's interior above the pipe's open top end, so long as the inner diameter of the stop ridge is small enough to project the ridge over the vent pipe wall at the open top thereof to firmly seat the heater body atop the pipe.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without department from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
A prototype of the present invention has been produced for use on a sewer vent pipe of 3-inch internal diameter and 1/4-inch wall thickness. An off the shelf ABS pipe coupling of 3.5-inch inner diameter and 5.25-inch length and having already having a '/4-inch high internal stop ridge 28 integrally formed centrally therealong was internally lathed fully around its central axis above the stop ridge to define the outer sleeve 26 with the thin-walled section 26d and inwardly flanged top end 26e. A cut-away having a parallelogram vertical cross-section, rather than the trapezoidal cross-section of the illustrated embodiment, was grinded away from the inside surface of the coupler from the ridge 28 to the thin-walled portion 26d and a hole was drilled through this thin portion of the coupler's cylindrical wall to form the power supply cord aperture 40. The ring of the prototype was cut from an ABS
pipe of equal inner and outer diameters to the sewer vent pipe to define a ring of approximately 3/8-inch height, and then grinded at the outside surface to form a cut-away of parallelogram vertical cross-section extending part way through the ring wall over a top half of its height or thickness and extending fully through the ring over the bottom half thereof. The ring was then inserted to sit atop the ridge 28 with the two cut-aways aligned about the coupler's central axis to defined the single heating element pathway past the ring. The heating element 22 was then passed through the aperture 40 until the power supply cord extended approximately two inches into the outer sleeve, whereafter the power supply cord was bent inside the upper sleeve at the aperture 40 to coil the heating element twice around the central axis of the coupler against the inside surface thereof before having its lower end being passed downwardly through the pathway to below the spacing ring 36. Prior to such installation, the heating cable was coated with heat shrink tubing from its free end to a position along the heating cable a short distance past where the cable would later transition from the annular space to the interal passage of the heater body through the pathway defined between the ring and the outer sleeve to better protect heat cable.
The inner sleeve 34 was formed from a 1-1/8-inch length of pipe of the same inner and outer diameters as the vent pipe and ring that was externally lathed over most of its length from its bottom end upward 7/8 of an inch, thereby leaving a 1/4-inch high externally flanged upper end 34b having an outer diameter sized to fit against the inwardly directed '/4-inch high flange 26e left above the internally lathed portion 26d of the outer sleeve 26. This inner sleeve 34 was then inserted through the open top end of the outer sleeve to sit atop the ring 36 to defined the inner wall of the annular cavity 38 and close off the heating element 22 inside the resulting heater body between the inner and walls thereof defined by the inner and outer sleeves, which where then adhered together at their flanged upper ends.
The parallel sloped sides of the parallelogram cut-aways of the prototype were angled at forty-five degrees to vertical, but other oblique acute angles may be used. The illustrated embodiment uses trapezoidal cut-aways having sloped sides converging at opposite forty-five degree angles to vertical. This trapezoidal shape allows either side to have the heating element placed thereagainst so that the coiling of the heating element around the central axis 16 can be made the same above and below the spacing ring 36 regardless of which direction it is coiled above the ring during assembly, thereby avoiding a sharp bend in the heating cable to change direction. The parallelogram shape of the prototype cut-aways required that the heating coil be coiled in the direction dictated by the slope of the cut-away sides above the ring in order to avoid such a direction change, but similarly provided the coil-encouraging slope of the heating element as it projects into the internal passage of the heater body above the open exhaust end of the sewer vent pipe.
Turning back now to the illustrated embodiment, the equal inner diameters of the sewer vent pipe 200 and the inner sleeve 24 and the projecting of the ridge 28 inward from the cylindrical bottom portion of the outer sleeve by a distance less than the pipe wall thickness of the sewer vent pipe provide an extension of the vent pipe of equal diameter and equal cross-sectional area to the projecting portion of the vent pipe extending upward from the roof. The internal passage extending through the heater body 12 can be thought of as divided into three cylindrical sections each having a diameter, and thus cross-sectional area perpendicular to the shared axis of the heater body and vent pipe, that are no less than the inner diameter and cross-sectional area, respectively, of the vent pipe. The cylindrical boundary of the internal passage 14 at these three sections are defined by respective ones of the cylindrical bottom portion 26b of the outer sleeve 26, the annular stop ridge 28 and the cylindrical inner surface of the sleeve assembly formed by the inner sleeve 34 and spacing ring 36.
The installation of the heater body on the top exhaust end of the vent pipe 200 is thus not only simple, requiring only sliding placement of the heater body over this top end of the vent pipe with the lower portion of the heating element 22 depending down the vent pipe in a coil-like manner, but also does not restrict the cross-sectional area or flow at the vent pipe's upper end. The heating apparatus also benefits from the combination of both a wrap-around heating element arrangement adjacent the top of the pipe-extending heater body and a direct pipe-interior heating arrangement depending downward inside the existing vent pipe below the heater body to maximize prevention of freezing and clogging of the pipe's internal sewer gas exhaust passage. It will be appreciated that the seat-in-place and non-restrictive structure of a heater body having an inward projecting stop and an inner passage equal to or greater than the inside cross-sectional area of the pipe may be used with different arrangements of heating elements, and that likewise a combinative external wrap-around and internally-depending heating element arrangement outside and inside the heater body's internal passage may be used with heater bodies that do not provide direct seat-in-place installation on the pipe and restriction-free extension of the pipe .
The heater body is preferably formed of ABS or PVC plastic, materials commonly used for sewer vent pipes, but may instead feature constructions using other materials. The stop within the internal passage through the heater body need not necessary be defined by an integral annular ridge. For example, with reference to Figure 3, without the integral ridge, the ring-defined bottom flange of the inner assembly 32 could instead define a non-integral ridge fixed to the outer sleeve at its inners surface to extend inward toward the central axis and define the stop.
In such an embodiment, the heating element could extend radially inward through the gap in the ring above the bottom face thereof toward the central axis and then bend downward past the bottom of the ring. This would avoid pinching of the heating element 22 between the ring bottom end the vent pipe top and would allow the same flat seating of the housing atop the vent pipe as the illustrated embodiment.
The downward extending pathway between the ring and outer sleeve could be replaced with a horizontal hole passing through the inner sleeve 34 slightly above the ring 36 so that the heating element instead projects into the internal passage 14 above the bottom flange of the inner assembly and then bends downward into the vent pipe 200 below. The heating element need not necessarily depend downward in the pipe 5 in a coiled fashion up against the pipe's inner walls surface, and may alternatively simply hang freely within the vent pipe (see Figure 1 where the heating element simply hangs downward through the open bottom of the heating apparatus).
The inner assembly need not necessarily have the two piece ring and sleeve structure, and may be produced as a single integral part having externally 10 flanged upper and lower ends around which the heating element can be pre-wrapped before insertion, provided that the depth of the recess defined at the exterior of the inner sleeve between the flanges is sufficient to receive the heating element wraps fully therein. With reference to Figure 3, this may involve having the full width of the annular cavity defined solely by this outer recess in the inner 15 assembly, in which case no inward extending flange 26e would be included on the outer sleeve 26.
The illustrated embodiment provides a high level of tamper resistance by making the annular cavity or chamber substantially fully closed and preventing easy withdrawal of the heating element therefrom through the generally right angle 20 bend in the power supply cord where it enters the cavity. The sloping of the pathway, which may be at angles other than the forty-five degree angle of the prototype, at a steeper angle than the coiling of the heater element within the annular cavity also forms a slight bend at the transition of the heating element from the cavity to the internal passage of the heater body that resists pulling of the heating element out of the cavity. However, it will be appreciated that such relatively full and complete enclosure of the space housing the heating element around the internal passage is not necessarily required. The bottom end of the housing for fitting over the vent pipe and the stop defined within the internal passage need not necessarily be a full and continuous cylinder and fully-closing ring about the central axis 16. The stop for example may be formed of distinct ledges or shoulders projecting inward from the inside of the outer sleeve at spaced positions about the axis 16, just as the bottom of the housing could be distinct flaps or sections projecting downward below the stop fit snugly against the vent pipe outer periphery at spaced locations thereabout, preferably still presenting concave inner surfaces with curved dimensions suitable for flush engagement to the pipe's outer periphery.
As a result, the internal passage need not necessarily be fully surrounded around the central axis at each location along the passage, and so the cross-sectional area or diameter of the internal passage at any point therealong may instead be thought of in terms of a circular cross section normal to the central axis with a circumference determined by elements of the housing that are each radially equidistant to the central axis, whether integral with or separate from one another at this location along the passage.
In the illustrated embodiment, the diameter and cross-sectional area of the internal passage at the ridge 28 are slightly greater than above the ridge because the projecting length of the ridge 28 inward toward the central axis 16 is less than the wall thickness of the pipe 200. It will be appreciated that that diameter and cross-sectional of internal passage of the heater body instead may be uniform from the bottom of the stop to the open top end of the passage. Also, the diameter and cross-section of the internal passage 14 may be larger than those of the vent pipe's interior above the pipe's open top end, so long as the inner diameter of the stop ridge is small enough to project the ridge over the vent pipe wall at the open top thereof to firmly seat the heater body atop the pipe.
Since various modifications can be made in my invention as herein above described, and many apparently widely different embodiments of same made within the spirit and scope of the claims without department from such spirit and scope, it is intended that all matter contained in the accompanying specification shall be interpreted as illustrative only and not in a limiting sense.
Claims (25)
1. A heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having open top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body having a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body, the open bottom end of the heater body having an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof and the cross-sectional area of the internal passage, at all positions between the open top and bottom ends of the heater body, being no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and an electrical heating device supported by the heater body and being arranged on a same side of the stop as the open top end of the heater body for connection to an electrical power source, a heating element of the electrical device being positioned in or adjacent the internal passage for heating thereof .
a heater body having open top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body having a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body, the open bottom end of the heater body having an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof and the cross-sectional area of the internal passage, at all positions between the open top and bottom ends of the heater body, being no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and an electrical heating device supported by the heater body and being arranged on a same side of the stop as the open top end of the heater body for connection to an electrical power source, a heating element of the electrical device being positioned in or adjacent the internal passage for heating thereof .
2. The heating apparatus of claim 1 wherein the electrical heating element loops around the internal passage of the heater body on the same side of the stop as the open top end of the heater body.
3. The heating apparatus of claim 2 wherein the electrical heating element loops around the internal passage of the heater body in an annular cavity between an outer periphery of the heater body and an inner periphery of the heater body defining boundaries of the internal passage.
4. The heating apparatus according to claim 3 wherein the electrical heating element, from where it loops around the interior passage of the heater body within the annular cavity, projects into the interior space of heater body from the annular cavity.
5. The heating apparatus of either one of claims 3 and 4 wherein the heater body comprises an inner sleeve fitted within and fixed to an outer sleeve, the stop being projecting inward from an inner surface of the outer sleeve and the inner sleeve being disposed on the same side of the stop as the open top end of the heater body, the annular cavity being defined between the inner and outer sleeves.
6. The heating apparatus of claim 5 wherein the stop comprises a ridge formed integrally on the outer sleeve.
7. The heating apparatus of either one of claims 5 and 6 wherein a bottom end of the inner sleeve is seated against the stop.
8. The heating apparatus of any one of claims 3 to 7 wherein a pathway connecting the annular cavity to the internal passage accommodates passage of the heater element from the annular cavity into the internal passage.
9. The heating apparatus of claim 8 wherein the pathway is sized to prevent passage of more than a single pass only of the heater element therethrough.
10. The heating apparatus of either one of claims 8 and 9 wherein sides of the pathway spaced apart are obliquely sloped relative to the axis of the internal passage to encourage the heater element to curve around the axis of the internal passage as it extends thereinto from the annular cavity.
11. The heating apparatus of claim 10 wherein the sides of the pathway converge along a direction parallel to the axis of the internal passage toward the open top end of the heater body.
12. The heating apparatus of any one of claims 1 to 11 wherein at least a portion of the heating element projects into the internal passage of the heater body.
13. A heating apparatus for installation on a top end of a sewer vent pipe projecting upwardly through a roof structure of a building to prevent frozen build up within said sewer vent pipe, the heating apparatus comprising:
a heater body having an internal passage that extends therethrough and is open at top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body being arranged for connection to the sewer vent at the top end thereof to communicate the interior passage of the heater body with an interior of the sewer vent pipe; and an electrical heating device comprising a heating element that loops around the interior passage of the heater body proximate the open top end thereof and depends downward toward the open bottom end of the heater body within the interior passage thereof from where the heating element loops around the interior passage for receipt of a bottom end of the heating element inside the sewer vent pipe.
a heater body having an internal passage that extends therethrough and is open at top and bottom ends interconnected by an internal passage extending through the heater body along an axis passing through said top and bottom ends, the heater body being arranged for connection to the sewer vent at the top end thereof to communicate the interior passage of the heater body with an interior of the sewer vent pipe; and an electrical heating device comprising a heating element that loops around the interior passage of the heater body proximate the open top end thereof and depends downward toward the open bottom end of the heater body within the interior passage thereof from where the heating element loops around the interior passage for receipt of a bottom end of the heating element inside the sewer vent pipe.
14. The heating apparatus of claim 13 wherein:
the heater body has a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body;
the open bottom end of the heater body has an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof;
the cross-sectional area of the internal passage, at all positions between the stop and open bottom ends of the heater body, is no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and the electrical heating element loops around the internal passage of the heater body on the same side of the stop as the open top end of the heater body.
the heater body has a stop defined at a position along the axis between the open top and bottom ends to make a cross-sectional area of the internal passage in a plane normal to the axis smaller at said position than at the open bottom end of the heater body;
the open bottom end of the heater body has an internal diameter sized for snug receipt of the top end of the sewer vent pipe into the internal passage of the heater body through the open bottom end thereof;
the cross-sectional area of the internal passage, at all positions between the stop and open bottom ends of the heater body, is no less than a cross sectional area bound by an inner diameter of the sewer vent pipe; and the electrical heating element loops around the internal passage of the heater body on the same side of the stop as the open top end of the heater body.
15. The heating apparatus of either one of claims 13 and 14 wherein the electrical heating element loops around the internal passage of the heater body in an annular cavity between an outer periphery of the heater body and an inner periphery of the heater body that defines boundaries of the internal passage.
16. The heating apparatus of claim 15 wherein the heater body comprises an inner sleeve fitted within and fixed to an outer sleeve, the stop being projecting inward from an inner surface of the outer sleeve and the inner sleeve being disposed on the same side of the stop as the open top end of the heater body, the annular cavity being defined between the inner and outer sleeves.
17. The heating apparatus of either one of claims 15 and 16 wherein a pathway connecting the annular cavity to the internal passage accommodates passage of the heater element from the annular cavity into the internal passage.
18. The heating apparatus of claim 17 wherein the pathway is sized to prevent more than a single pass of the heater element therethrough.
19. The heating apparatus of either one of claims 17 and 18 wherein sides of the pathway spaced apart are obliquely sloped relative to the axis of the internal passage to encourage the heater element to curve around the axis of the internal passage as it extends thereinto from the annular cavity.
20. The heating apparatus of claim 19 wherein the sides of the pathway converge along a direction parallel to the axis of the internal passage toward the open top end of the heater body.
21. The heating apparatus of any one of claims 1 to 20 wherein the heating element comprises heat cable.
22. The heating apparatus of any one of claims 1 to 20 wherein the heating element is self-regulating heat cable.
23. The heating apparatus of any one of claims 1 to 22 wherein the heating device comprises a power supply cord connected to the heating element.
24. The heating apparatus of claim 23 wherein the power supply cord is connected to the heating element inside the heater body.
25. The heating apparatus of any one of claims 1 to 24 wherein the heating device is of an elongated structure passing into the heater body through an aperture in an outer wall thereof and features a bend inside the heater body to prevent withdrawal of the heating device therefrom through the aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2656973A CA2656973A1 (en) | 2009-03-10 | 2009-03-10 | Heating apparatus for installation on rooftop end of sewer vent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2656973A CA2656973A1 (en) | 2009-03-10 | 2009-03-10 | Heating apparatus for installation on rooftop end of sewer vent pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2656973A1 true CA2656973A1 (en) | 2010-09-10 |
Family
ID=42729272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2656973A Abandoned CA2656973A1 (en) | 2009-03-10 | 2009-03-10 | Heating apparatus for installation on rooftop end of sewer vent pipe |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2656973A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396168A (en) * | 2018-12-01 | 2019-03-01 | 中节能城市节能研究院有限公司 | Contaminated soil in-situ heat reparation combination exchanger and Soil Thermal repair system |
| CN113063048A (en) * | 2021-04-21 | 2021-07-02 | 刘园园 | Self-friction heat-generating type petroleum pipeline anti-freezing device |
| CN113293937A (en) * | 2021-06-24 | 2021-08-24 | 中益诚达建设集团有限公司 | Intelligent pumping and drainage system for roof in rainy period and construction method thereof |
-
2009
- 2009-03-10 CA CA2656973A patent/CA2656973A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109396168A (en) * | 2018-12-01 | 2019-03-01 | 中节能城市节能研究院有限公司 | Contaminated soil in-situ heat reparation combination exchanger and Soil Thermal repair system |
| CN109396168B (en) * | 2018-12-01 | 2023-12-26 | 中节能城市节能研究院有限公司 | Combined heat exchanger for in-situ thermal remediation of polluted soil and soil thermal remediation system |
| CN113063048A (en) * | 2021-04-21 | 2021-07-02 | 刘园园 | Self-friction heat-generating type petroleum pipeline anti-freezing device |
| CN113063048B (en) * | 2021-04-21 | 2023-08-01 | 刘园园 | Self-friction heat generation type petroleum pipeline anti-freezing device |
| CN113293937A (en) * | 2021-06-24 | 2021-08-24 | 中益诚达建设集团有限公司 | Intelligent pumping and drainage system for roof in rainy period and construction method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |