Abstract
A dual venturi having a tubular part having primary and secondary passageways, wherein a primary gas inlet is provided on the side wall of the primary passageway; a body part, for opening/closing the flow of secondary air by rotating in horizontal plane and vertical plane directions, the horizontal plane direction being the cross-sectional direction of the tubular part and the vertical plane direction being perpendicular to the horizontal plane; a damper part having a damper part-side secondary gas outlet; a driving part, for rotationally driving the damper part in the horizontal and vertical planes; and a secondary gas inlet, which openly connects selectively to the damper part-side secondary gas outlet on the basis of the rotational position of the damper part, and for forming the rotational shaft of the damper part along with the rotational shaft of the driving part.
Claims
1. A dual venturi comprising, a tubular part having a primary passageway and a secondary passageway separated by an internal partition therebetween, wherein a primary gas inlet is provided on a side wall of the primary passageway; a damper part having a damper part-side secondary gas outlet and a body part, the damper part being located in an interior of the second passageway of the tubular part, for opening/closing a flow of a secondary air by rotating in a horizontal plane and a vertical plane directions, the horizontal plane direction being a cross-sectional direction of the tubular part and the vertical plane direction being perpendicular to the horizontal plane; a driving part, connected to a lateral surface of the damper part via a rotational shaft, for rotationally driving the damper part in the horizontal and vertical plane directions; and a secondary gas inlet for introducing a secondary gas into the secondary passageway of the tubular part via the damper part by means of a secondary gas inlet-side outlet, which connects selectively to the damper part-side secondary gas outlet according to a rotational position of the damper part, wherein the secondary gas inlet is coupled with the damper part such that the secondary gas inlet is configured to function as a stationary rotational shaft for fixing the damper part and the damper part can be rotated on the secondary gas inlet when the damper part is rotated by the rotational shaft of the driving part.
2. The dual venturi as claimed in claim 1, wherein the driving part comprises a synchronous motor connected to the rotational shaft of the driving part.
3. The dual venturi as claimed in claim 2, wherein the secondary gas inlet-side outlet is connected to the damper part-side secondary gas outlet when the body part of the damper part is vertically positioned.
4. The dual venturi as claimed in claim 2, wherein the driving part comprises a limit switch indicating a vertical position and a horizontal position of the damper part.
5. The dual venturi as claimed in claim 2, wherein a diameter width of the tubular part increases from a center towards an upper portion and a lower portion thereof.
6. The dual venturi as claimed in claim 1, wherein the damper part-side secondary gas outlet is formed on an upper or a lower outer surface of the body part, when the damper part is positioned in the horizontal plane direction.
7. The dual venturi as claimed in claim 6, wherein the secondary gas inlet-side outlet is formed on a left or a right side surface of the secondary gas inlet and configured to be connected to the damper part-side secondary gas outlet formed on the upper or the lower outer surface of the body part when the damper part is vertically positioned.
8. The dual venturi as claimed in claim 1, wherein the secondary gas inlet-side outlet is connected to the damper part-side secondary gas outlet when the body part of the damper part is vertically positioned.
9. The dual venturi as claimed in claim 1, wherein the driving part comprises a limit switch indicating a vertical position and a horizontal position of the damper part.
10. The dual venturi as claimed in claim 1, wherein a diameter width of the tubular part increases from a center towards an upper portion and a lower portion thereof.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) FIG. 1 is an exploded perspective view showing the dual venturi according to the first embodiment of the present invention.
(2) FIG. 2a shows an embodiment of the present invention, that is a longitudinal sectional view of the dual venturi with the damper part in a closed state; and FIG. 2b is a longitudinal sectional view showing the dual venturi with the damper part in an open state.
(3) FIG. 3a, FIG. 3b and FIG. 3c show an embodiment of the present invention, that is a diagram showing the damper part in the closed state. FIG. 3a is a perspective view of the dual venturi, FIG. 3b is a planar sectional view of the dual venturi and FIG. 3c is a sectional view showing the positional relationship between the secondary gas inlet and the secondary gas outlets of the damper part.
(4) FIG. 4a and FIG. 4b show an embodiment of the present invention, that is a diagram showing the damper in the open state. FIG. 4a is a planar sectional view of the dual venturi and FIG. 4b is a sectional view showing the positional relationship between the secondary gas inlet and the secondary gas outlets of the damper part.
(5) FIG. 5a and FIG. 5b show the positional relationship between secondary gas inlet-side secondary gas outlet and the damper part at the limit switch of the driving part. FIG. 5a is a planar view of the limit switch and FIG. 5b is a lateral view of the limit switch.
(6) FIG. 6 is a drawing showing prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
(7) Hereinafter, the first embodiment of the present invention will be described with reference to the accompanying drawings.
(8) First, the overall structure of the dual venturi is explained with reference to FIG. 1, FIG. 2a and FIG. 2b. FIG. 1 is an exploded perspective view defining the dual venturi according to an embodiment of the present invention, FIG. 2a shows an embodiment of the present invention, that is a longitudinal sectional view of the dual venturi with the damper in a closed state, and FIG. 2b is a longitudinal sectional view showing the dual venturi with the damper in an open state, respectively.
(9) The dual venturi according to the present invention comprises a tubular part (40) having a primary passageway (43) and a secondary passageway (44) separated by a partition (47) therebetween (Refer to FIGS. 2a and 2b), with a primary gas inlet (45) provided on the center of the side wall of the primary passageway (43); a damper part (20) formed on the tubular part (40) for opening/closing the secondary passageway (44) which forms the secondary air passageway extending in the direction from the lower portion to the upper portion of the tubular part (40); a driving part (10) connected to the lateral surface of the damper part (40) and inserted via the tubular part side second hole (42), resulting in the rotational shaft (15) of the motor to be connected to the damper part-side first hole (23) to rotationally drive the damper part (20); and a secondary gas inlet (60) inserted through the first hole (41) of the tubular part (40), and then passing through the primary passageway (43) and the partition (47) to connect to the damper part-side second hole (27) (Refer to FIG. 3c) within the secondary passageway (44), thereby supplying secondary gas via the damper part (20). In this manner, the tubular part (40) allows only the primary air and primary gas to pass through the primary passageway (43) separated by the partition (47), and allows only the secondary air and secondary gas to pass through the secondary passageway (44), to effectively regulate the air-gas ratio of the primary mixed airflow and secondary mixed airflow.
(10) As illustrated in FIG. 1, the tubular part (40) has a central diameter that is smaller than the diameter of both ends of the higher and lower portions, thus the central passageway is narrowly formed. This configuration can be more clearly understood from FIG. 2a and FIG. 2b. However, the shape of the tubular part (40) can be a cylindrical shape with equal upper and lower portions, and the present invention is not particularly limited to this shape.
(11) The damper part (20) comprises an overall semicircle shaped body part (29), which has a horizontal area that can block the secondary passageway (44) of the tubular part (40), the upper surface of the body part (29) being provided with a damper part-side secondary gas outlet (22) having four slot-type holes through which secondary gas is discharged. The body part (29) corresponding thereto can also have a secondary gas outlet. That is, it can also be formed on the corresponding lower portion of the secondary gas outlet (22). Further, four slot-type holes are shown, but the number of the slot-type holes can be suitably selected according to need, and its shape can also be varied.
(12) As shown in FIG. 2a and FIG. 2b, end part of the secondary gas inlet (60) in contact with the damper side (20) is closed by the damper part.
(13) The secondary gas inlet (60) is cylindrically shaped, and is connected to the damper part-side second hole (27) (Refer to FIG. 3c) within the second passageway (44) via insertion through the tubular part-side first hole (41), the primary passageway (43) and the partition (47). Here, the secondary gas inlet (60) does not rotate but the damper part (20) can, thus the secondary gas inlet (60) also functions as a stationary shaft to rotate the damper part (20) together with the rotational shaft (15) of the motor. The damper part-side portion of the secondary gas inlet (60) becomes a closed state as defined above, and a secondary gas inlet-side secondary gas outlet (62) having an identical shape to the damper part-side secondary gas outlet (22) is formed on the circumference of the area near the damper part-side of the secondary gas inlet (60). The secondary gas inlet-side secondary gas outlet (62) is also symmetrically shaped and can form outlets on both sides of the pipe or form an outlet only on one side. FIG. 2a illustrates a closed state of the damper part (20), that is the state in which the upper and lower passageways of the secondary passageway (44) of the tubular part (40) are blocked and only the primary passageway (43) of the damper part (20) is used as the passageway for the primary air and primary gas of the tubular part (40) to pass through. In other words, the state in which the damper part (20) is placed in the cross-sectional direction, that is the horizontal plane of the tubular part (40), only the primary gas inlet (45) is open towards primary passageway of the tubular part (40) (maintains an open state at all times), and the secondary gas inlet-side secondary gas outlet (62) is closed.
(14) FIG. 2b illustrates opened state of the damper part (20), that is the state in which the upper and lower passageways of the tubular part (40) are open, thus most of the primary passageway (43) as well as the secondary passageway (44) of the tubular part (40) is substantially used as the air passageway, the so-called secondary air passing state. Here, the damper part (20) is placed in the vertical plane that is perpendicular to the horizontal plane, and the primary gas inlet (45) as well as the secondary gas inlet-side secondary gas outlet (62) are both open towards the damper part-side secondary gas outlet (22). As a result, all functions of the first step distribution and second step distribution can be executed.
(15) Hereafter, operation of the dual venturi according to an embodiment of the present invention will be described in detail with reference to FIG. 3a to FIG. 5b. Parts not thoroughly explained in the above detailed description will be explained through the additional configuration.
(16) First, FIG. 3a, FIG. 3b and FIG. 3c show an embodiment of the present invention, that is a diagram showing the closed state of the damper part (20). FIG. 3a is a perspective view of the dual venturi, FIG. 3b is a planar sectional view of the dual venturi and FIG. 3c is a sectional view showing the positional relationship between the secondary gas inlet and the secondary gas outlets of the damper part.
(17) As shown in the perspective view of FIG. 3a, when the damper part (20) is closed, the positional relationship between the tubular part (40) and the damper part (20) is equal to when the damper part (20) blocks the entire upper and lower air passageways of the secondary passageway (44) of the tubular part (40), and only the primary passageway (43) substantially becomes the air passageway (primary air passageway) of the tubular part (40). In other words, the damper part (20) is placed in the horizontal plane in the cross-sectional direction of the tubular part (40), and at this time, as shown in FIG. 3b, only the primary gas inlet (45) is open towards the tubular part (40) side (open at all times) so that primary gas flows through the tubular part (40), and the secondary gas inlet-side secondary gas outlet (62) is blocked by the wall of the damper part-side second hole (27) and thus closed, as shown in FIG. 3c. That is, a small quantity of relatively low level primary air and primary gas flow through the primary passageway (43) of the tubular part in the closed state.
(18) FIG. 4a and FIG. 4b show an embodiment of the present invention, that is a diagram showing the open state of the damper part. FIG. 4a is a planar sectional view of the dual venturi and FIG. 4b is a sectional view showing the positional relationship between the secondary gas inlet and the secondary gas outlets of the damper part.
(19) As shown by the sectional view of FIG. 4a, when the damper part (20) is opened, the positional relationship between the tubular part (40) and the damper part (20) is equal to the substantially opened state of the entire upper and lower air passageways of the tubular part (40) via the opening of the secondary passageway (44). In other words, the damper part (20) is placed upright in the vertical direction to the horizontal plane in the closed state, that is the vertical plane to the cross-sectional direction of the secondary passageway (44) of the tubular part (40). At this time, as shown in FIG. 4a, the primary gas flows through the primary gas inlet (45) and also the secondary gas inlet-side secondary gas outlet (62) is opened to let the secondary gas flow out of the secondary passageway (44).
(20) Referring to FIG. 4b, the secondary gas inlet-side secondary gas outlet (62) and the damper part-side secondary gas outlet (22) formed on the wall of the damper part-side second hole (27) correspond to each other and thereby are connected.
(21) In this embodiment, the secondary gas inlet-side secondary gas outlet (62) is formed only on one part of the circumference diameter such that only one lateral surface (for instance, the upper direction-side surface of the upper and lower directions of the tubular part (40)) of the damper part (20) releases secondary gas. However, for instance, the secondary gas inlet-side secondary gas outlet (62) can be installed on the opposite side (that is, 180) of the cylindrical secondary gas inlet (60) wall circumference to release secondary gas in the upper and lower directions of the damper part (20).
(22) FIG. 5a and FIG. 5b show the positional relationship between the secondary gas outlet of the secondary gas inlet and the damper part at the limit switch of the driving part. FIG. 5a is a planar view of the limit switch and FIG. 5b is a lateral view of the limit switch, respectively.
(23) In the limit switch (11) shown in FIG. 5a, reference signs 211a and 211b show the position points of the damper part-side secondary gas outlets, 211c and 211d respectively show the position points of the secondary gas inlet-side secondary gas outlets, 211g shows the damper part-side positional probe, and 211h shows the secondary gas inlet-side positional probe, respectively. One of the damper part-side secondary gas outlet position points (211a)(211b) is positioned at the damper part-side positional probe (211g), and in the same manner if one of the secondary gas inlet-side secondary gas outlet position points (211c)(211d) corresponds to the secondary gas inlet-side positional probe (211h), secondary air and secondary gas are blocked, as shown in FIG. 3c. That is, it shows the state in which the damper part (20) is at the horizontal position.
(24) Further, on the contrary, if one of the secondary gas inlet-side secondary gas outlet position points (211c)(211d) corresponds to the damper part-side positional probe (211g), and at the same time one of the damper part-side secondary gas outlet position points (211a)(211b) is positioned at the secondary gas inlet-side positional probe (211h), the secondary air and secondary gas are open to flow through the tubular part (40), as shown in FIG. 4a. That is, this shows the state in which the damper part (20) is vertically positioned.
(25) Referring to FIG. 5b, a synchronous motor is used as the motor (13) included in the driving part (10) and the rotational shaft (15) of the direct motor (13) can be connected to the damper part-side first hole (23). Thus, components necessary for the AC motor in the prior art such as a wire, or return spring can be removed, allowing the dual venturi of the present invention to be more simplified compared to the prior art.
(26) The above description defines a preferred embodiment of the present invention but is not limited thereto, and various modifications and other similar embodiments are possible by the skilled person in the art. For instance, the combination of the limit switch sets the secondary gas open state as when the damper part-side probe and the secondary gas inlet-side probe positions are against each secondary gas outlet positions. However, the opposite setting may be used as long as practically identical results are obtained. Further, positions of the primary gas inlet and the partition of the tubular part may be varied according to their use, to change the flow velocity of the primary passageway and the secondary passageway. Thus, various modifications and embodiments that can be clearly expected are also within the scope of the present invention.
REFERENCE SIGNS
(27) 10: Driving Part, 11: Limit Switch, 15: Rotational Shaft of the Motor, 20: Damper Part, 22: Damper Part-Side Secondary Gas Outlet, 23: Damper Part-Side First Hole, 24: Damper Part-Side Sealing Hole, 27: Damper Part-Side Second Hole, 29: Body Part, 40: Tubular Part, 41: Tubular Part-Side First Hole, 42: Tubular Part-Side Second Hole, 43: Primary Passageway, 44: Secondary Passageway, 45: Primary Gas Inlet, 47: Partition, 60: Secondary Gas Inlet, 62: Secondary Gas Inlet-Side Outlet, 211a: Damper Part-Side Secondary Gas Outlet Position Point 211b: Damper Part-Side Secondary Gas Outlet Position Point, 211e: Secondary Gas Inlet-Side Outlet Position Point, 211d: Secondary Gas Inlet-Side Outlet Position Point, 211g: Damper Part-Side Positional Probe, 211h: Secondary Gas Inlet-Side Positional Probe
