WO2013122333A1

WO2013122333A1 - Dual venturi for combustor

Info

Publication number: WO2013122333A1
Application number: PCT/KR2013/000443
Authority: WO
Inventors: 김경주
Original assignee: 주식회사 경동나비엔
Priority date: 2012-02-15
Filing date: 2013-01-18
Publication date: 2013-08-22
Also published as: KR20130093884A; AU2013221125B2; CN104114946A; JP2015507169A; JP5908124B2; KR101308922B1; CN104114946B; EP2816286A4; EP2816286A1; US20150056563A1; AU2013221125A1

Abstract

The present invention relates to a dual venturi for a combustor and, more specifically, to a dual ventri for a combustor which can control, in two stages, the amount of gas and air supplied to a burner provided in a water heater, wherein a motor and a damper are combined in such a manner that the damper is rotated by the driving of the motor, and thus the damper simultaneously opens or closes the inlet for secondary air and gas, thereby efficiently controlling the quantity of heat. The dual venturi comprises: a housing which has a first gas inlet and a second gas inlet on one side of the upper part thereof, and which has an interior divided by a partition wall such that a first passage and a second passage are formed; and an opening and closing means which is disposed in the housing, has an upper part connected to the second gas inlet such that gas flows therein, and controls the flow of air and gas by closing or opening the second passage as a damper is rotated by a motor provided on the exterior of the housing.

Description

Dual Venturi for Combustors

The present invention relates to a dual venturi (combustion apparatus) for combustion apparatus, specifically controlling the amount of supply of gas and air to the burner side provided in the water heater in two stages, by combining a motor and a damper to damper by driving the motor. As the damper is rotated and the damper simultaneously opens or shuts off the inlet of the secondary air and gas, the present invention relates to a dual venturi for a combustion device capable of efficient calorie control.

In general, combustors such as boilers and water heaters used for heating and hot water use are classified into oil boilers, gas boilers, electric boilers, and water heaters according to the fuel supplied, and variously developed and used according to installation purposes. .

Among these combustors, in particular, gas boilers and water heaters generally use Bunsen burners or premixed burners to burn gaseous fuel, and double premixed burners. The silver gas and air are mixed at the optimum mixing ratio of combustion, and then the mixer (air + gas) is supplied to the salt air to be combusted.

In addition, the performance of the combustion apparatus is evaluated by the Turn-Down Ratio (TDR), which is a ratio of the maximum gas consumption to the minimum gas consumption in a gas combustion device in which the amount of gas is variably controlled. Say. For example, if the maximum gas consumption is 24, OOkcal / h and the minimum gas consumption is 8, OOkcal / h, the turndown ratio (TDR) is 3: 1. The turndown ratio (TDR) is limited by how stable the flame can be at minimum gas consumption conditions.

In the case of gas boilers and water heaters, the greater the turndown ratio (TDR), the greater the convenience in using heating and hot water. In other words, if the burner is operated in a region with a low turn down ratio (TDR) (i.e. a high minimum gas consumption) and a low load of heating and hot water, the combustor may be frequently turned on or off. Therefore, the deviation in temperature control becomes large and the durability of equipment falls. Therefore, various methods have been developed to improve the turndown ratio (TDR) of the burner applied to the combustor.

The valve that supplies gas from the proportional control burner includes an electric modulating gas valve controlled by a large current value and a pneumatic modulating gas controlled by a differential pressure generated during air supply. valve).

The air proportional control valve uses a blower to control the amount of gas supplied to the burner by the differential pressure generated in accordance with the air supply required for combustion to the burner, wherein the air and gas required for combustion are gas-air mixing device (Gas- air is mixed and fed to the burner in the form of a mixer (air + gas).

The basic factor limiting the turndown ratio (TDR) in the gas-air mixture of a gas burner using such an air proportional valve is the relationship between the gas consumption (Q) and the differential pressure (ΔP). The relationship between and flow rate is as follows.

That is, as can be seen from the relation above, to increase the fluid flow rate twice, the differential pressure must be increased four times.

Therefore, in order to make the turndown ratio (TDR) 3: 1, the ratio of the differential pressure must be 9: 1, and in order to make the turndown ratio (TDR) 10: 1, the ratio of the differential pressure must be 100: 1. The problem is that it is impossible to infinitely increase the supply pressure.

In order to solve such a problem that the gas supply pressure cannot be increased infinitely, the turndown ratio of the gas burner is divided by opening and closing the passage of each gas injected into the burner by dividing the air and gas supply paths into two or more areas, respectively. A method of increasing (TDR) is disclosed.

The present invention has been made in view of the above circumstances, and it is to provide a dual venturi for a combustion device capable of miniaturizing a device by simplifying a complicated structure and having high operation reliability, easy manufacturing, and reducing manufacturing cost. The purpose.

The present invention for achieving the above technical problem, the first gas inlet and the second gas inlet is formed on the upper side, the inner side is partitioned by the partition wall and the first passage and the second passage is formed of the housing It is provided on the inside, the upper part is connected to the second gas inlet gas is introduced into the inside, the damper is rotated by a motor provided outside the housing to close or open the second passage to control the flow of air and gas And opening and closing means.

In one embodiment, the opening and closing means, the tubular guide tube formed with one or more concave guides on the inner wall; The convex guide is formed on the outer wall so as to correspond to the concave guide and moves along the longitudinal direction of the guide tube in the guide tube, and a gas outlet communicating with the second gas inlet is formed at an end thereof, and has a cam shape on the outer surface. A tubular movable body in which a movable cam is formed; A valve body formed on an outer surface thereof, a gas outlet formed on a side of the damper, a valve body cam formed on an inner side of the damper in a shape corresponding to the movable cam, and engaged with the motor; And a cap embedded in the movable body to support the movable body with an elastic force, and a cap supporting the spring and coupled to an upper portion of the guide tube.

In one embodiment, the opening and closing means, when the motor is rotated, the moving cam formed on the moving body is rotated while the tip of each of the moving cam and the valve body cam contact each other to push up the moving body At the same time as the outlet is opened, the damper of the valve body is rotated so that the second passage is opened.

In one embodiment, the valve body further comprises a sealing member for sealing the inner lower end.

In one embodiment, the motor is characterized in that it is composed of a synchronous motor.

Through the above configuration features, the present invention can obtain the following effects.

First, the calorific value of the low calorie or high calorie in the water heater can be selectively output as needed, and the user can control the calorie of the calorie or calorie according to the amount of heat required, thereby reducing fuel costs.

Second, the interior of the housing is divided into partitions to form a first passage and a second passage, and only the primary air and the primary gas flow in the first passage, and only the secondary air and the secondary gas flow in the second passage. 2 Turn-down ratio can be easily adjusted by controlling the flow of air and gas on the side of the passage.

Third, since the secondary gas outlet is opened and closed by the rotation of the valve body, the second passage is also opened and closed, thereby simplifying the structure.

Figure 1a is a perspective view showing a state of the dual venturi for a combustion machine of the present invention.

FIG. 1B is a cross-sectional view taken along the line A-A of FIG. 1A.

2A is a cross-sectional view taken along the line B-B in FIG. 1A.

FIG. 2B is a view showing a state in which the movable body is raised in FIG. 2A.

3A and 3B are perspective views showing a state of the movable body of FIG. 1B.

It is a perspective view which shows the state of the valve body of FIG. 1B.

5a and 5b are perspective views showing the state of the opening and closing means.

FIG. 6 is a cross-sectional view taken along the line C-C in FIG. 5A.

7 is a view showing the positional relationship between the limit switch and the motor of the motor provided in the dual venturi for a combustion device of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiment of the present invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings and the like may be exaggerated to emphasize a more clear description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention are omitted.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the present invention, a dual venturi for a combustion device of the present invention will be described in detail.

Figure 1a is a perspective view showing a state of the dual venturi for a combustion device of the present invention, Figure 1b is a cross-sectional view taken along the line AA of Figure 1a, Figure 2a is a cross-sectional view taken along the line BB of Figure 1a, Figure 2b 3A and 3B are perspective views showing the state of the moving body of FIG. 1B, FIG. 4 is a perspective view showing the state of the valve body of FIG. 1B, and FIGS. 5A and 5B are perspective views showing the state of the opening and closing means, 6 is a cross-sectional view taken along line CC of FIG. 5A, and FIG. 7 is a diagram illustrating a positional relationship between a limit switch and a motor of a motor provided in the dual venturi for a combustion device of the present invention.

1 to 6, the dual venturi for a combustion device of the present invention has a first gas inlet 14 and a second gas inlet 15 formed at one upper side thereof, and an inner side thereof is partitioned by a partition 13. A cylindrical housing 10 in which the first passage 11 and the second passage 12 are formed is provided.

In addition, a turbo fan (not shown) for supplying a mixer (gas + air) introduced from the first passage 11 and the second passage 12 to a burner is coupled to the outlet 16 of the housing 10. .

On the other hand, the upper portion is connected to the second gas inlet 15 in the inner central portion of the housing 10, the gas flows into the inside, the damper 142 is rotated by a motor 180 provided outside the housing 10 Opening and closing means 100 for controlling the flow of air and gas by closing or opening the second passage 12 is coupled. In addition, the motor 180 is preferably composed of a synchronous motor, which is to reduce the manufacturing cost because it uses a cheap synchronous motor generally used.

The opening and closing means 100 may include a tubular guide tube 130 having one or more concave guides 131 formed on the inner wall, and a convex guide 122 formed on the outer wall to correspond to the concave guide 131. A gas outlet 123 moving along the length direction of the guide tube 130 in the guide tube 130 and communicating with the second gas inlet 15 is formed at an end thereof, and a cam-shaped movable body cam is formed on the outer surface thereof. The tubular moving body 120 in which the 121 is formed is provided. The inner surface of the guide tube 130 and the outer surface of the movable body 120 are formed to be stepped with each other, where the step is in contact with each other sealing ring 146 is interposed to prevent the leakage of gas.

In addition, it is coupled to the lower portion of the movable body 120, the damper 142 is formed on the outer surface, the gas outlet 143 is formed on the side of the damper 142, and the movable cam 121 and the inner portion The valve body cam 141 is formed to have a corresponding shape but is engaged with each other, and a valve body 140 coupled to the motor 180 is provided.

In addition, the movable body 120 is composed of a spring 160 for supporting the movable body 20 with an elastic force, and a cap 170 for supporting the spring 160 and coupled with the upper portion of the guide tube 120. do.

On the other hand, the connecting member 190 is coupled to the lower portion of the valve body 140, the connecting member 190 is coupled to the rotating shaft of the motor 180 to drive the driving force generated in the motor 180 valve body 140 It serves to deliver. In addition, a sealing member 145 for sealing the inner lower end is inserted into the lower end of the valve body 140.

On the other hand, the outer side of the housing 10, the rotating shaft 181 is further provided with a motor 180 for rotating the valve body 140 is coupled to the connecting member 190 and coupled to the coupling member 190. . The motor 180 provides a rotational force to the valve body 140, the projection 182 is formed in the rotation shaft 181 at intervals of 90 degrees to operate the limit switch 201 in accordance with the rotation of the motor 180 The rotation angle of the valve body 140 is controlled. The limit switch 201 is provided inside the switch box 200, and the switch box 200 is interposed between the housing 100 and the motor 180.

The operating state of the dual venturi for a combustion device of the present invention configured as described above will be described.

First, only the primary gas and the primary air are supplied from the water heater. As shown in FIGS. 2A and 5A, the damper 142 of the valve body 140 may include air and gas in the second passage 12. The second passage 12 is blocked by being rotated perpendicularly to the flowing direction, and at the same time, the concave portion of the movable cam 121 and the convex portion of the valve cam 141 and the convex portion of the movable cam 121 and the valve cam The recesses of 141 are in contact with each other, so that the gas outlet 123 of the movable body 120 is in contact with the sealing member 145 and the second gas passage is blocked, and the gas outlet 143 is also blocked. Is maintained.

Therefore, the mixture of air and gas is introduced into the turbo fan through only the first gas inlet 14 and the first passage 11, so that the combustion device can be driven with low heat.

On the other hand, in order to drive the combustion device at high heat, as shown in FIGS. 2B and 5B, when the power is applied to the motor 180 and the valve body 140 is rotated by 90 degrees, the damper 142 is connected to the second. It is rotated to coincide with the longitudinal direction of the passage 12.

At the same time, since the valve body cam 141, which is formed on the inside while the valve body 140 is rotated, also rotates, the convex portions (tip portions) of the valve body cam 141 and the movable body cam 121 are in contact with each other. As the valve body cam 141 rotates, the movable body cam 121 is pushed up to rise. At this time, the convex guide 122 is inserted into the concave guide 131, so that the movable body 120 easily rises inside the guide tube 130.

Therefore, since the valve body 140 is rotated in a direction coinciding with the longitudinal direction of the second passage 12, the second passage 12 is opened, and at the same time, as shown in FIGS. 2B and 5B, the moving body 120 As the gas outlet 123 is lowered from the sealing member 145, the secondary gas is introduced through the gas outlet 143, and the secondary gas is mixed with air and gas into the second passage 12. As a result, more air is mixed with the air and the gas introduced through the first passage 11 and the first gas inlet 14 to generate more mixers, and thus, the combustion apparatus can be driven at a high calorific value. .

Then, when the motor 180 is rotated again by 90 degrees in order to drive the combustion device at a low heat amount again, the second passage 12 and the gas outlet 143 are in the state shown in FIGS. 1B, 2A, and 5A. The burner is shut off and driven with low heat. Here, the spring 160 is embedded inside the movable body 120 to increase the restoring force of the movable body 120 when the valve body 140 is rotated to close the second passage 12.

Hereinafter, the limit switch 201 for controlling the rotation of the motor 180 for driving the damper to operate the combustion device in a low heat amount or a high heat amount as described above will be described.

Referring to FIG. 7, the protrusion 182 is protruded at an interval of 90 degrees on the outer circumferential surface of the rotation shaft 181 of the motor 180, and the movable protrusion 202 is also formed on the limit switch 201. ) Are arranged on the same circumference. When the projection 182 is pressed at the movable projection 202 while rotating at intervals of 90 degrees, the limit switch 201 is short-circuited with current to stop the rotation of the motor 180.

Therefore, when driving the combustion device, when the projection 182 is rotated by 90 degrees to press the movable projection 202, the limit switch 201 is turned off (off) the drive of the motor 180 is stopped and the valve body 140 is also stopped, so that the second passage 12 is opened or closed.

The embodiment of the dual venturi for a combustor of the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains may various embodiments of the present invention. You will know. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents, and substitutes within the spirit and scope of the invention as defined by the appended claims.

[Description of the code]

10 housing 11 first passage

12: second passage 13: partition wall

14: first gas inlet 15: second gas inlet

100: opening and closing means 120: moving body

121: movable cam 122: convex guide

130: guide tube 131: concave guide

140: valve body 141: valve body cam

142: damper 143: gas outlet

145: sealing member 146: sealing ring

160: spring 170: cap

180: motor 181: rotation axis

182: protrusion 190: connecting member

200: switch case 201: limit switch

202: movable projection

Claims

The first gas inlet 14 and the second gas inlet 15 is formed on the upper side, the inner side is partitioned by the partition 13 to form a first passage 11 and the second passage 12 ( 10) and

The damper 142 is rotated by a motor 180 provided inside the housing 10, the upper part of which is connected to the second gas inlet 15, and the gas is introduced into the inside of the housing 10. And opening and closing means (100) for controlling the flow of air and gas by closing or opening the second passage (12).
The method of claim 1,

The opening and closing means 100,

A tubular guide tube 130 having one or more concave guides 131 formed on an inner wall thereof;

Convex guide 122 is formed on the outer wall to correspond to the concave guide 131 is moved along the longitudinal direction of the guide tube 130 in the guide tube 130, the second gas inlet 15 at the end A gas outlet 123 communicating with the tubular movable body 120 having a cam-shaped movable body cam 121 formed on an outer surface thereof;

The damper 142 is formed on the outer surface, the gas outlet 143 is formed on the side of the damper 142, the inner side is formed in a shape corresponding to the movable cam 121, the valve body cam to engage with each other 141 is formed, the valve body 140 is coupled to the motor 180;

A spring 160 embedded in the movable body 120 to support the movable body 20 with an elastic force;

Dual venturi for a combustion device comprising a cap 170 for supporting the spring 160 and coupled to the upper portion of the guide tube (120).
The method according to claim 1 or 2,

The opening and closing means 100,

When the motor 180 rotates, as the movable cam 121 formed in the movable body 120 is rotated, convex portions of each of the movable cam 121 and the valve cam 141 are in contact with each other and the movable body 120 is rotated. And the gas outlet 143 is opened, and the damper 142 of the valve body 140 is rotated to open the second passage 12 so as to open the second venturi.
The method of claim 2,

The valve body 140,

Dual venturi for combustion apparatus further comprises a sealing member 145 for sealing the inner lower end.
The method according to claim 1 or 2,

The motor 180 is,

Dual venturi, characterized in that consisting of a synchronous motor.