CA2506359C - Convection heat trap - Google Patents
Convection heat trap Download PDFInfo
- Publication number
- CA2506359C CA2506359C CA002506359A CA2506359A CA2506359C CA 2506359 C CA2506359 C CA 2506359C CA 002506359 A CA002506359 A CA 002506359A CA 2506359 A CA2506359 A CA 2506359A CA 2506359 C CA2506359 C CA 2506359C
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- CA
- Canada
- Prior art keywords
- water
- flow path
- tank
- bushing
- water flow
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- Expired - Fee Related
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Abstract
A water heater includes a water-tight tank, a cold water in the tank inlet defining a water flow path and a hot water outlet defining a water flow path. A flapp er valve member including a ring section is fixed relative to one of the water inlet and water outlet. A unitary flapper section extends from the ring section and has a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet. The flapper valve member ma y be secured within a spud mounted to the tank around the one of the water inlet and water outlet. Alternatively, a bushing is fixed relative to the one of the water inlet and water outlet, through which an associated water flow path flows. The ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing. The flapper section moves out of the water flow path in respons e to water flow and moves into the water flow path in the absence of water flow t o restrict the flow of convection currents.
Description
CONVECTION HEAT TRAP
This application is a division of copending commonly owned Canadian Patent Application Serial No. 2,299,734 filed February29,2000.
BACKGROUND OF THE INVENTION
While the present invention has useful application in a variety of fluid systems, it was particularly designed for use in a storage-type water heater.
In such applications, it is important that heat losses both at the cold inlet and hot outlet of the water heater tank be kept to a minimum when the water heater is in a stable condition, i.e., water is not being drawn into or out of the tank. On the other hand, it is important that when water is drawn out of the hot outlet, the flow of water into the cold inlet and out of the hot outlet be substantially unimpeded by the heat trap of the present invention.
BRIEF SUMMARY OP THE INVENTION
In accordance with the parent application, the invention thereof provides a heat trap which comprises: a bushing adapted to permit water to flow along a flow path therethrough, the bushing including an opening through a side of the bushing;
and a unitary flapper valve member having a flapper section with a permanently biased central rest position extending at least partially across the flow path, wherein a portion of the flapper section extends through the opening, and a ring section interconnected with the flapper section and extending around the bushing to support the flapper valve member with respect to the bushing.
The bushing member is made of plastic material. The flapper section of the flapper valve member and the ring section of the flapper valve member are formed integrally with each other. The flapper valve member is made of a flexible material.
In accordance with the present invention, a first heat trap assembly is mounted at the cold water inlet of a water heater storage tank. A second heat trap assembly is mounted at the hot water outlet of a water heater storage tank. The first and second heat trap assemblies will allow flow of water both into and out of the tank when hot water is drawn out of the hot water outlet. The first and second heat trap assemblies will reduce convection heat loss from inside the tank when the water heater is in a stable condition, i.e., when hot water is not being drawn out of the hot water outlet.
Thus, the present invention may be considered as providing a water heater which comprises: a water tank; a water inlet for introducing cold water into the tank, the inlet having a water flow path; a water outlet for drawing hot water from the tank, the outlet having a water flow path; a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a spud mounted to the tank around the one of the water inlet and water outlet, wherein the flapper valve member is secured within the spud, wherein the flapper section moves out of the flow path in first and second opposite directions in response to water flow into and out of the tank respectively and moves into the flow path in the absence of water flow to restrict the flow of convection currents.
The present invention may also be considered as providing a water heater which comprises: a water tank; a water inlet for introducing cold water into the tank, the inlet having a water flow path; a water outlet for drawing hot water from the tank, the outlet having a water flow path; a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a bushing fixed relative to the one of the water inlet and the water outlet and through which the associated water flow path flows, wherein the ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing; wherein the flapper section moves out of the water flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the water flow path in the absence of water flow to restrict the flow of convection currents.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE INVENTION
Fig. 1 is a partially schematic sectional view of the top portion of a water heater tank having heat trap assembly units mounted in the cold water inlet and the hot water outlet;
Fig. 2 is a partially schematic sectional view of the top portion of a water heater tank having a second embodiment of heat trap assembly units mounted in the cold water inlet and the hot water outlet;
Fig. 3 is a perspective view of a heat trap assembly adapted for drop-in installation in the hot water outlet of a water heater;
Fig. 4 is a perspective view of a heat trap assembly adapted for screw-in installation in the hot water outlet of a water heater;
Fig. 5 is a perspective view of a heat trap assembly adapted for installation in the cold water inlet dip tube of a water heater;
Fig. 6 is a perspective view of a flexible valve member adapted for mounting in the heat trap housing shown in Fig. 7;
Fig. 7 is a perspective view of a heat trap bushing in which the flexible valve member shown in Fig. 6 is mounted;
Fig. 8 is a side elevation view of a heat trap housing member in which the heat trap bushing is mounted; and Fig. 9 is a perspective view of a heat trap assembly like that shown in Fig. 3 mounted in a pipe nipple.
DETAILED DESCRIPTION OF THE INVENTION
The usefulness of the present invention may express itself in different applications. It is particularly designed for use in a storage-type water heater. It will therefore be described hereinafter in such an environment.
This application is a division of copending commonly owned Canadian Patent Application Serial No. 2,299,734 filed February29,2000.
BACKGROUND OF THE INVENTION
While the present invention has useful application in a variety of fluid systems, it was particularly designed for use in a storage-type water heater.
In such applications, it is important that heat losses both at the cold inlet and hot outlet of the water heater tank be kept to a minimum when the water heater is in a stable condition, i.e., water is not being drawn into or out of the tank. On the other hand, it is important that when water is drawn out of the hot outlet, the flow of water into the cold inlet and out of the hot outlet be substantially unimpeded by the heat trap of the present invention.
BRIEF SUMMARY OP THE INVENTION
In accordance with the parent application, the invention thereof provides a heat trap which comprises: a bushing adapted to permit water to flow along a flow path therethrough, the bushing including an opening through a side of the bushing;
and a unitary flapper valve member having a flapper section with a permanently biased central rest position extending at least partially across the flow path, wherein a portion of the flapper section extends through the opening, and a ring section interconnected with the flapper section and extending around the bushing to support the flapper valve member with respect to the bushing.
The bushing member is made of plastic material. The flapper section of the flapper valve member and the ring section of the flapper valve member are formed integrally with each other. The flapper valve member is made of a flexible material.
In accordance with the present invention, a first heat trap assembly is mounted at the cold water inlet of a water heater storage tank. A second heat trap assembly is mounted at the hot water outlet of a water heater storage tank. The first and second heat trap assemblies will allow flow of water both into and out of the tank when hot water is drawn out of the hot water outlet. The first and second heat trap assemblies will reduce convection heat loss from inside the tank when the water heater is in a stable condition, i.e., when hot water is not being drawn out of the hot water outlet.
Thus, the present invention may be considered as providing a water heater which comprises: a water tank; a water inlet for introducing cold water into the tank, the inlet having a water flow path; a water outlet for drawing hot water from the tank, the outlet having a water flow path; a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a spud mounted to the tank around the one of the water inlet and water outlet, wherein the flapper valve member is secured within the spud, wherein the flapper section moves out of the flow path in first and second opposite directions in response to water flow into and out of the tank respectively and moves into the flow path in the absence of water flow to restrict the flow of convection currents.
The present invention may also be considered as providing a water heater which comprises: a water tank; a water inlet for introducing cold water into the tank, the inlet having a water flow path; a water outlet for drawing hot water from the tank, the outlet having a water flow path; a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a bushing fixed relative to the one of the water inlet and the water outlet and through which the associated water flow path flows, wherein the ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing; wherein the flapper section moves out of the water flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the water flow path in the absence of water flow to restrict the flow of convection currents.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE INVENTION
Fig. 1 is a partially schematic sectional view of the top portion of a water heater tank having heat trap assembly units mounted in the cold water inlet and the hot water outlet;
Fig. 2 is a partially schematic sectional view of the top portion of a water heater tank having a second embodiment of heat trap assembly units mounted in the cold water inlet and the hot water outlet;
Fig. 3 is a perspective view of a heat trap assembly adapted for drop-in installation in the hot water outlet of a water heater;
Fig. 4 is a perspective view of a heat trap assembly adapted for screw-in installation in the hot water outlet of a water heater;
Fig. 5 is a perspective view of a heat trap assembly adapted for installation in the cold water inlet dip tube of a water heater;
Fig. 6 is a perspective view of a flexible valve member adapted for mounting in the heat trap housing shown in Fig. 7;
Fig. 7 is a perspective view of a heat trap bushing in which the flexible valve member shown in Fig. 6 is mounted;
Fig. 8 is a side elevation view of a heat trap housing member in which the heat trap bushing is mounted; and Fig. 9 is a perspective view of a heat trap assembly like that shown in Fig. 3 mounted in a pipe nipple.
DETAILED DESCRIPTION OF THE INVENTION
The usefulness of the present invention may express itself in different applications. It is particularly designed for use in a storage-type water heater. It will therefore be described hereinafter in such an environment.
Figs. 1 and 2 are partially schematic views of the upper portion of a storage-type water heater in which the heat trap assemblies of the present invention are installed.
Referring first to Fig. 1, reference numeral 10 is the upper portion of a water heater tank having a cold water inlet 12 and a hot water outlet 14 mounted in the tank 3a top. A heat trap assembly 16 is mounted at the cold water inlet 12 and a heat trap assembly 18 is mounted at the hot water outlet 14. Assemblies 16, 18 are of identical construction. Internally threaded spud members 20 are mounted (by welding) at the cold inlet 12 and hot outlet 14 to provide for a threaded connection to exterior piping (not shown).
The heat trap assembly mounting arrangements shown in Fig. 1 contemplates mounting the heat trap assemblies in the tank at the time the water heater is manufactured.
A more detailed view of heat trap assemblies 16 and I8 is shown in Figs. 6, 7 and 8. The assemblies 16 and 18 are comprised of a bushing member 22 (Fig. 7), a flapper valve member 24 (Fig. 6) and a housing member 26 (Fig. 8). Bushing 22 is comprised of a flange 28 and a cylindrical body portion 30 formed integrally with the flange. Body 30 has a plurality of circumferentially spaced raised ribs 32 formed thereon. A window 34 is provided in the side of body 30 and extends up into flange 28. Bushing 22 is made from any suitable plastic material such as cross-linked polyethylene. As indicated above, assemblies 16 and 18 are of identical construction.
Flapper valve member 24 (Fig. 6) is comprised of a central flapper section 36 and an outside ring section 38 formed integrally with the valve section 36.
Flapper valve member 24 is made from any suitable flexible material such as 70 Duro EPDM
rubber.
Housing 26 (Fig. 8) is comprised of a flange portion 40 and a tubular body portion 42 formed integrally therewith. Housing 26 is made from any suitable plastic material such as cross-linked polyethylene.
The first step in the assembly of parts 22, 24, 26 is to install the flapper valve member 24 in bushing 22. This is accomplished by folding the sides of valve section 36 together so that section 36 can be inserted through window 34 (Fig. 7) in bushing 22. The ring section 38 of valve member 24 is then stretched over the top of bushing flange 28 to a position directly beneath the flange.
The subassembly of parts 22 and 24 is then installed in housing 26 by pressing body 30 of bushing 22 into the body portion 42 of housing 26. The friction between ribs 32 on bushing 22 and the internal surface of body portion 42 of housing 26 will serve to securely maintain bushing 22 in housing 26.
Referring now to Figs. 3, 4 and 5, Fig. 3 shows a heat trap assembly 18 comprised of the parts shown in Figs. 6, 7 and 8; namely, a flapper valve member 24, a bushing 22 and a housing 26. As explained above, the bushing is pressed into housing 26 and thus the bushing flange 28 is the only part of the bushing shown in Fig.
3.
The heat trap assembly 16a shown in Fig. 4 is identical to the Fig. 3 assembly with one exception. Assembly 16a has threads 44 formed on the side of bushing flange 28 so that the bushing 16a can be threaded into a spud member 20.
In the Fig. 1 embodiment, the heat trap assembly 16 and the dip tube 46 are installed by simply dropping the tube 46 first and then the assembly 16 through the cold inlet spud 20 at the manufacturing site. The parts are securely retained in assembled position in the field by the installation of a connector nipple, not shown.
Also in the Fig. 1 embodiment, the heat trap assembly 18 at the hot outlet 14 is simply dropped through the spud 20 at the hot outlet at the manufacturing site. The assembly 18 is securely retained in place in the field by the installation of a connector nipple, not shown.
Referring now to Figs. 2 and 9, an alternative arrangement for mounting the heat trap assemblies is shown. In the Fig. 2 arrangement, the heat trap assemblies 16 and 18 are pressed into pipe nipples 48 as shown in Figs. 2 and 9. Pipe nipples 48 are threaded into spuds 50 which are welded to the top of tank 10 when the water heater is manufactured. This arrangement contemplates installing the heat trap assemblies 16 and 18 (and nipples 48) in the field as opposed to installation during the water heater manufacture as in the Fig. 1 embodiment.
HEAT TRAP OPERATION
First it is noted that the diameter of the valve section 36 of flapper valve member 24 is slightly smaller than the inside diameter of bushing 22. Thus, the section 36 of valve 24 is free to move (open) in response to a pressure differential across the flapper valve 24.
Thus, when a stable condition exists in the operation of the water heater, i.e., no flow either into or out of the tank, the valve 24 functions to restrict convection currents from flowing either into or out of the tank. Heat losses, which would occur absent the installation of the heat traps, are thereby reduced.
It follows that when a pressure differential is produced at the heat trap assemblies 16 and 18, i.e., when hot water is drawn from the tank 10, the flapper valves will open to allow flow of water both into and out of tank 10.
While the invention herein has been shown and described in what is presently conceived to be the most practical preferred embodiment, it will be obvious to one of ordinary skill in the art that many modifications may be made thereof within the scope of the invention, which scope is not to be limited except by the appended claims.
Referring first to Fig. 1, reference numeral 10 is the upper portion of a water heater tank having a cold water inlet 12 and a hot water outlet 14 mounted in the tank 3a top. A heat trap assembly 16 is mounted at the cold water inlet 12 and a heat trap assembly 18 is mounted at the hot water outlet 14. Assemblies 16, 18 are of identical construction. Internally threaded spud members 20 are mounted (by welding) at the cold inlet 12 and hot outlet 14 to provide for a threaded connection to exterior piping (not shown).
The heat trap assembly mounting arrangements shown in Fig. 1 contemplates mounting the heat trap assemblies in the tank at the time the water heater is manufactured.
A more detailed view of heat trap assemblies 16 and I8 is shown in Figs. 6, 7 and 8. The assemblies 16 and 18 are comprised of a bushing member 22 (Fig. 7), a flapper valve member 24 (Fig. 6) and a housing member 26 (Fig. 8). Bushing 22 is comprised of a flange 28 and a cylindrical body portion 30 formed integrally with the flange. Body 30 has a plurality of circumferentially spaced raised ribs 32 formed thereon. A window 34 is provided in the side of body 30 and extends up into flange 28. Bushing 22 is made from any suitable plastic material such as cross-linked polyethylene. As indicated above, assemblies 16 and 18 are of identical construction.
Flapper valve member 24 (Fig. 6) is comprised of a central flapper section 36 and an outside ring section 38 formed integrally with the valve section 36.
Flapper valve member 24 is made from any suitable flexible material such as 70 Duro EPDM
rubber.
Housing 26 (Fig. 8) is comprised of a flange portion 40 and a tubular body portion 42 formed integrally therewith. Housing 26 is made from any suitable plastic material such as cross-linked polyethylene.
The first step in the assembly of parts 22, 24, 26 is to install the flapper valve member 24 in bushing 22. This is accomplished by folding the sides of valve section 36 together so that section 36 can be inserted through window 34 (Fig. 7) in bushing 22. The ring section 38 of valve member 24 is then stretched over the top of bushing flange 28 to a position directly beneath the flange.
The subassembly of parts 22 and 24 is then installed in housing 26 by pressing body 30 of bushing 22 into the body portion 42 of housing 26. The friction between ribs 32 on bushing 22 and the internal surface of body portion 42 of housing 26 will serve to securely maintain bushing 22 in housing 26.
Referring now to Figs. 3, 4 and 5, Fig. 3 shows a heat trap assembly 18 comprised of the parts shown in Figs. 6, 7 and 8; namely, a flapper valve member 24, a bushing 22 and a housing 26. As explained above, the bushing is pressed into housing 26 and thus the bushing flange 28 is the only part of the bushing shown in Fig.
3.
The heat trap assembly 16a shown in Fig. 4 is identical to the Fig. 3 assembly with one exception. Assembly 16a has threads 44 formed on the side of bushing flange 28 so that the bushing 16a can be threaded into a spud member 20.
In the Fig. 1 embodiment, the heat trap assembly 16 and the dip tube 46 are installed by simply dropping the tube 46 first and then the assembly 16 through the cold inlet spud 20 at the manufacturing site. The parts are securely retained in assembled position in the field by the installation of a connector nipple, not shown.
Also in the Fig. 1 embodiment, the heat trap assembly 18 at the hot outlet 14 is simply dropped through the spud 20 at the hot outlet at the manufacturing site. The assembly 18 is securely retained in place in the field by the installation of a connector nipple, not shown.
Referring now to Figs. 2 and 9, an alternative arrangement for mounting the heat trap assemblies is shown. In the Fig. 2 arrangement, the heat trap assemblies 16 and 18 are pressed into pipe nipples 48 as shown in Figs. 2 and 9. Pipe nipples 48 are threaded into spuds 50 which are welded to the top of tank 10 when the water heater is manufactured. This arrangement contemplates installing the heat trap assemblies 16 and 18 (and nipples 48) in the field as opposed to installation during the water heater manufacture as in the Fig. 1 embodiment.
HEAT TRAP OPERATION
First it is noted that the diameter of the valve section 36 of flapper valve member 24 is slightly smaller than the inside diameter of bushing 22. Thus, the section 36 of valve 24 is free to move (open) in response to a pressure differential across the flapper valve 24.
Thus, when a stable condition exists in the operation of the water heater, i.e., no flow either into or out of the tank, the valve 24 functions to restrict convection currents from flowing either into or out of the tank. Heat losses, which would occur absent the installation of the heat traps, are thereby reduced.
It follows that when a pressure differential is produced at the heat trap assemblies 16 and 18, i.e., when hot water is drawn from the tank 10, the flapper valves will open to allow flow of water both into and out of tank 10.
While the invention herein has been shown and described in what is presently conceived to be the most practical preferred embodiment, it will be obvious to one of ordinary skill in the art that many modifications may be made thereof within the scope of the invention, which scope is not to be limited except by the appended claims.
Claims (5)
1. A water heater comprising:
a water tank;
a water inlet for introducing cold water into the tank, the inlet having a water flow path;
a water outlet for drawing hot water from the tank, the outlet having a water flow path;
a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a spud mounted to the tank around the one of the water inlet and water outlet, wherein the flapper valve member is secured within the spud, wherein the flapper section moves out of the flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the flow path in the absence of water flow to restrict the flow of convection currents.
a water tank;
a water inlet for introducing cold water into the tank, the inlet having a water flow path;
a water outlet for drawing hot water from the tank, the outlet having a water flow path;
a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a spud mounted to the tank around the one of the water inlet and water outlet, wherein the flapper valve member is secured within the spud, wherein the flapper section moves out of the flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the flow path in the absence of water flow to restrict the flow of convection currents.
2. The water heater of claim 1, further comprising a bushing positioned within the spud and through which the associated water flow path flows, wherein the ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing.
3. The water heater of claim 2, wherein the bushing includes an opening through which the flapper section extends.
4. The water heater of claim 1, further comprising a pipe nipple threaded into the spud, wherein the flapper valve member is secured within the pipe nipple.
5. A water heater comprising:
a water tank;
a water inlet for introducing cold water into the tank, the inlet having a water flow path;
a water outlet for drawing hot water from the tank, the outlet having a water flow path;
a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a bushing fixed relative to the one of the water inlet and the water outlet and through which the associated water flow path flows, wherein the ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing;
wherein the flapper section moves out of the water flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the water flow path in the absence of water flow to restrict the flow of convection currents.
a water tank;
a water inlet for introducing cold water into the tank, the inlet having a water flow path;
a water outlet for drawing hot water from the tank, the outlet having a water flow path;
a flapper valve member including a ring section fixed relative to one of the water inlet and the water outlet, and a unitary flapper section that extends from the ring section and with a permanently biased central rest position extending at least partially across the water flow path of the one of the water inlet and the water outlet; and a bushing fixed relative to the one of the water inlet and the water outlet and through which the associated water flow path flows, wherein the ring section extends around a portion of the bushing to support the flapper valve member with respect to the bushing;
wherein the flapper section moves out of the water flow path in first and second opposite directions in response to water flow into and out of the tank respectively, and moves into the water flow path in the absence of water flow to restrict the flow of convection currents.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/264,845 US6164333A (en) | 1999-03-02 | 1999-03-02 | Convection heat trap |
| US09/264,845 | 1999-03-02 | ||
| CA 2299734 CA2299734C (en) | 1999-03-02 | 2000-02-29 | Convection heat trap |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2299734 Division CA2299734C (en) | 1999-03-02 | 2000-02-29 | Convection heat trap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2506359A1 CA2506359A1 (en) | 2000-09-02 |
| CA2506359C true CA2506359C (en) | 2007-05-01 |
Family
ID=34750822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002506359A Expired - Fee Related CA2506359C (en) | 1999-03-02 | 2000-02-29 | Convection heat trap |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2506359C (en) |
-
2000
- 2000-02-29 CA CA002506359A patent/CA2506359C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2506359A1 (en) | 2000-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20160229 |