Water heater blower assembly having a low exhaust port

Abstract

A draft inducer blower assembly for use with a water heater has a housing, a motor, and a fan. The housing has an exhaust volute surrounding the fan and a base adapted to be mounted atop a water heater. The housing has an inlet port adapted to receive exhaust gas from the water heater. The fan is connected to the motor for rotation about a rotation axis. The exhaust volute has a cut-off at a cut-off angle relative to the rotation axis. The exhaust volute has an exhaust outlet passageway that extends to an exhaust port. The exhaust port is lower than the top of the exhaust volute.

Claims

1. A draft inducer blower assembly for use with a gas-fueled water heater, the blower assembly comprising a housing, a motor, a fan; the housing having an exhaust volute surrounding the fan, an inlet port, and an exhaust port, the inlet port and the exhaust port being in fluid communication with the exhaust volute; the housing being configured and adapted to be mounted atop the water heater, the housing having an inlet port adapted and configured to receive exhaust gas from the water heater when the housing is mounted atop the water heater, the fan being connected to the motor for rotation about a rotation axis, the exhaust volute having a cut-off at a cut-off angle relative to the rotation axis, the exhaust volute having an exhaust outlet passageway including a terminal portion that extends to the exhaust port; the housing being configured and adapted such that, when the housing is oriented so that the terminal portion of the exhaust outlet passageway extends vertically upwardly, the cut-off angle is not more than thirty degrees positive from horizontal.

2. A draft inducer blower assembly in accordance with claim 1 wherein the housing is configured and adapted such that the exhaust port is lower than a top of the exhaust volute when the housing is oriented so that the terminal portion of the exhaust passageway extends vertically upwardly.

3. A draft inducer blower assembly in accordance with claim 1 wherein the housing is configured and adapted to be mounted atop the water heater such that the exhaust outlet passageway extends beneath the cut-off and thereafter extends vertically upwardly to the exhaust port to discharge exhaust gas vertically upwardly through the exhaust port.

4. A draft inducer blower assembly for use with a gas-fueled water heater, the blower assembly comprising: a housing, a motor, and a fan; the housing having an exhaust volute surrounding the fan, an inlet port, and an exhaust port, the inlet port and the exhaust port being in fluid communication with the exhaust volute, the housing being configured and adapted to be mounted atop the water heater, the inlet port being adapted and configured to receive exhaust gas from the water heater when the housing is mounted atop the water heater, the fan being connected to the motor for rotation about a rotation axis, the housing being configured and adapted such that, when the housing is oriented to discharge exhaust gas vertically upwardly through the exhaust port, the exhaust port is lower than a top of the exhaust volute.

5. A draft inducer blower assembly in accordance with claim 4 wherein the housing is configured and adapted to discharge exhaust gas vertically upwardly through the exhaust port when the exhaust port faces vertically upward.

6. A draft inducer blower assembly in accordance with claim 4 wherein the exhaust volute has a cut-off at a cut-off angle relative to the rotation axis, and the housing is configured and adapted such that the cut-off angle extends at an angle that is not more than thirty degrees positive from horizontal when the housing is oriented to discharge exhaust gas vertically upwardly through the exhaust port.

7. A draft inducer blower assembly in accordance with claim 4 wherein the exhaust volute has a cut-off at a cut-off angle relative to the rotation axis, and the housing is configured and adapted such that the cut-off angle is negative from horizontal when the housing is oriented to discharge exhaust gas vertically upwardly through the exhaust port.

8. A draft inducer blower assembly for use with a gas-fueled water heater, the blower assembly comprising a housing, a motor, and a fan; the housing having an exhaust volute surrounding the fan, an inlet port, and an exhaust port, the inlet port and the exhaust port being in fluid communication with the exhaust volute; the housing configured and adapted to be mounted atop the water heater, the inlet port adapted and configured to receive exhaust gas from the water heater when the housing is mounted atop the water heater, the fan being connected to the motor for rotation about a rotation axis, the exhaust volute having a cut-off at a cut-off angle relative to the rotation axis, the housing being configured and adapted such that, when the housing is oriented to discharge exhaust gas vertically upwardly through the exhaust port, the cut-off angle is not more than thirty degrees positive from horizontal.

9. A draft inducer blower assembly in accordance with claim 8 wherein the exhaust volute has an exhaust outlet passageway including a terminal portion that extends to the exhaust port, wherein the housing is configured and adapted to be mounted atop the water heater such that the exhaust outlet passageway extends beneath the cut-off and the terminal portion of the exhaust outlet passageway extends vertically upwardly.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 is a perspective view of an embodiment of a draft inducer blower assembly in accordance with the invention.

(2) FIG. 2 is an elevational cross-sectional view of the draft inducer blower assembly shown in FIG. 1, taken about the rotation axis of the fan.

(3) FIG. 3 is an elevational cross-sectional view of the draft inducer blower assembly shown in FIGS. 1 and 2, taken about a plane that is perpendicular to the rotation axis and that lies midway through the thickness of the volute of the blower assembly.

(4) FIG. 4 is a front elevation view of the draft inducer blower assembly shown in FIGS. 1-3, showing a ninety degree pipe elbow attached to the blower assembly.

(5) FIG. 5 is a front elevation view of the draft inducer blower assembly shown in FIGS. 1-3, showing another ninety degree pipe elbow attached to the blower assembly.

(6) FIG. 6 is a front elevation view of the draft inducer blower assembly shown in FIGS. 1-3, showing an ultra-low ninety degree elbow and cross-over pipe attached to the blower assembly.

(7) FIG. 7 is a perspective view of a water heater comprising the blower assembly shown in FIGS. 1-3.

(8) FIG. 8 is an elevational cross-sectional view of another embodiment of a draft inducer blower assembly, taken about a plane that is perpendicular to the rotation axis and that lies midway through the thickness of the volute of the blower assembly.

(9) Reference numerals in the written specification and in the drawing figures indicate corresponding items.

DETAILED DESCRIPTION

(10) An embodiment of a draft inducer blower assembly 20 in accordance with the invention is shown in the figures. The blower assembly 20 comprises a housing 22 that houses a fan 24. The base 26 of the housing 22 is configured to attach atop a water heater 28, as shown in FIG. 7. The housing 22 also forms an exhaust volute 30 in which the fan 24 resides. An inlet passageway 32 extends from an opening in the base of the housing to the fan 24 and is adapted to connect to the exhaust outlet not shown of a gas-fueled water heater. The exhaust volute 30 comprises an exhaust outlet passageway 34 that extends to an exhaust port 36. The fan 24 is attached to a motor 38 that rotationally drives the fan about a rotation axis when in use.

(11) As shown in FIG. 3, the exhaust volute 30 has a cut-off 40 that is oriented at a cut-off angle α relative to the rotation axis. The cut-off angle α is appreciably low, preferably no more than thirty degrees positive from horizontal, and more preferably no more than twenty degrees positive from horizontal, and more preferably the cut-off angle α is negative from horizontal as is shown in FIG. 3. The exhaust outlet passageway 34 extends beneath the cut-off 40 before reaching the exhaust port 36. Preferably, the exhaust outlet passageway 34 turns upward as it extends toward the exhaust port 36 after passing beneath the cut-off 40 to the extent the exhaust port faces vertically upward. However, the exhaust outlet passageway 34 need not extend beneath the cut-off 40 and need not turn upward and the exhaust port 36 could face horizontally. Regardless, the exhaust port 36 is preferably located at an elevation lower than the top of the exhaust volute 30 and is also preferably located at an elevation lower than the top of the fan 24.

(12) The configuration of the blower assembly 20 provides considerable advantages when the clearances above the tank of a water heater are limited. As shown in FIGS. 1 and 7, the blower assembly 20 is ready to be connected to a vertically oriented exhaust flue pipe not shown. Additionally, as shown in FIGS. 4-6, the blower assembly 20 can be used with elbow flue pipe fittings 42 such that the blower assembly can be connected to horizontal flue piping. Notably and as should be appreciated from FIGS. 4-6, by providing an exhaust port 36 that lies appreciably beneath the top of the exhaust volute 30 of the housing 22, especially an exhaust port 36 that faces vertically upward, the transition to horizontal flue piping can be made just above the top of the exhaust volute 30, which is necessary in many low clearance situations. As is shown in FIG. 6, a unique cross-over pipe 44 can also be provided, which can bridge over the top of the exhaust volute 30 when clearance above a water heater tank demands a transition that is even closer to the base 26 of the blower assembly 20. The opposite ends of the cross-over pipe 44 have circular cross-sections while the bottom of the center section necks in from the bottom side and also widens so as not to create a flow restriction. The downstream end of the cross-over pipe comprises a drain 46 for water that condensates, since such water is not able to drain back to the blower assembly 20. No modification of the blower assembly 20 itself is needed to convert the blower assembly 20 from a vertical flue configuration to a horizontal flue configuration. In the embodiment of FIGS. 1-8, the exhaust volute and the base are fixed relative to each other, and more particularly are non-adjustably fixed relative to each other. But it is to be understood that in an alternative embodiment (not shown) the exhaust volute is rotatable relative to the base of the blower assembly and is adjustably fixed.

(13) Referring now to FIG. 8, another embodiment of a blower assembly is generally indicated by the reference numeral 120. The primary difference between the blower assembly 120 of FIG. 8 and the blower assembly 20 of FIGS. 1-3 is the cut-off angle. Except as noted herein, the above description of the blower assembly 20 of FIGS. 1-3 applies equally to the blower assembly 120 of FIG. 8, but the reference numbers of comparable features of the blower assembly 120 of FIG. 8 are preceded by the prefix “1”. In the blower assembly 120 of this embodiment, the cut-off 140 is oriented at a cut-off angle α approximately ten degrees positive from horizontal. Preferably, the cut-off angle α is not more than thirty degrees positive from horizontal.

(14) In view of the foregoing, it should be appreciated that the invention has several advantages over the prior art.

(15) As various modifications could be made in the constructions and methods herein described and illustrated without departing from the scope of the invention, it is intended that all matter contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative rather than limiting. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims appended hereto and their equivalents.

(16) It should also be understood that when introducing elements of the present invention in the claims or in the above description of exemplary embodiments of the invention, the terms “comprising,” “including,” and “having” are intended to be open-ended and mean that there may be additional elements other than the listed elements. Additionally, the term “portion” should be construed as meaning some or all of the item or element that it qualifies. Moreover, use of identifiers such as first, second, and third should not be construed in a manner imposing any relative position or time sequence between limitations. Still further, the order in which the steps of any method claim that follows are presented should not be construed in a manner limiting the order in which such steps must be performed, unless such an order is inherent or explicit.