JP2015507169A - Dual venturi for combustion equipment - Google Patents

Abstract

The present invention relates to a dual venturi for combustion equipment, and more specifically, controls the amount of gas and air supplied to a burner side provided in a water heater in two stages, and combines a motor and a damper to connect the motor. The present invention relates to a dual venturi for a combustion device capable of efficient heat quantity control because the damper opens and shuts off the secondary air and gas inlets simultaneously by rotating the damper by driving. A housing in which a first gas inlet and a second gas inlet are formed on one side of the upper portion, and an inner side is partitioned by a partition wall to form a first passage and a second passage, and the housing is provided inside the housing. The upper part is connected to the second gas inlet and gas flows inward, and 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. Opening and closing means. [Selection] Figure 1b

Description

  The present invention relates to a dual venturi for combustion equipment, and more specifically, controls the amount of gas and air supplied to a burner side provided in a water heater in two stages, and combines a motor and a damper to connect the motor. The present invention relates to a dual venturi for a combustion device capable of efficient heat quantity control because the damper opens and shuts off the secondary air and gas inlets simultaneously by rotating the damper by driving.

In general, combustion equipment such as boilers and water heaters used for the purpose of heating and hot water is divided into oil boilers, gas boilers, electric boilers, and water heaters depending on the supplied fuel. Developed and used.
Among such combustion devices, in particular, gas boilers and water heaters generally use a Bunsen burner or a premixed burner in order to burn gas fuel, and of these, a premixed burner ( In the combustion method of the premixed burner, gas and air are mixed at an optimum mixing ratio in a combustion state, and then the mixture (air + gas) is supplied to the flame hole and burned.

  The performance of combustion equipment is evaluated by the turn-down ratio (TDR). The turn-down ratio is defined as “maximum gas consumption vs. minimum gas consumption in a gas combustion apparatus in which the amount of gas can be variably adjusted. Say "ratio of quantity". For example, if the maximum gas consumption is 24,000 kcal / h and the minimum gas consumption is 8,000 kcal / h, the turndown ratio (TDR) is 3: 1. The turndown ratio (TDR) is limited by how stable a flame can be maintained at minimum gas consumption conditions.

In the case of gas boilers and water heaters, the greater the turndown ratio (TDR), the greater the convenience when using heating and hot water. That is, when the burner operates in a region where the turn-down ratio (TDR) is small (that is, when the minimum gas consumption is large) and the load of heating and hot water is small, the on / off of the combustion equipment is turned on / off. Since it occurs frequently, the deviation during temperature control increases and the durability of the equipment decreases. Accordingly, various methods have been developed to improve the burner turndown ratio (TDR) applied to combustion equipment to ameliorate such problems.
In such a proportional control type burner, a valve for supplying gas includes a current proportional control type valve that is controlled by a current value and an air proportional control type valve that is controlled by a differential pressure generated when air is supplied. (Pnematic modulating gas valve).

The air proportional control valve controls the amount of gas supplied to the burner by a differential pressure generated when supplying air necessary for combustion of the burner using a blower. At this time, air and gas necessary for combustion are The gas is mixed by a gas-air mixer and supplied to the burner in the form of an air-fuel mixture (air + gas).
In the gas-air mixing device of a gas burner using such an air proportional control valve, the basic factor that limits the turndown ratio (TDR) is the relationship between the gas consumption (Q) and the differential pressure (ΔP). In general, the relationship between the differential pressure of the fluid and the flow rate is as follows:

That is, as can be seen from the above relational expression, in order to increase the fluid flow rate by a factor of two, the differential pressure must be increased by a factor of four.
Therefore, the differential pressure ratio is 9: 1 to make the turndown ratio (TDR) 3: 1, and the differential pressure ratio is 100: 1 to make the turndown ratio (TDR) 10: 1. However, there is a problem in that it is impossible to increase the gas supply pressure indefinitely.
In order to solve such a problem that the gas supply pressure cannot be increased indefinitely, the path through which air and gas are supplied is divided into two or more regions, and the passages of each gas injected to each burner are opened and closed. Thus, a method for increasing the turndown ratio (TDR) of a gas burner is disclosed.

  The present invention has been invented in view of the circumstances as described above, and is highly reliable in operation, easy to manufacture, and low in manufacturing cost while simplifying a complicated structure and downsizing the apparatus. It is an object of the present invention to provide a dual venturi for a combustion device that can save energy.

  To achieve the above technical problem, the present invention provides a first gas inlet and a second gas inlet formed on one side of an upper portion and partitioned by a partition wall on the inner side. And the housing is formed on the inner side of the housing, the upper part is connected to the second gas inlet and gas flows inward, and the damper is rotated by the motor provided on the outer side of the housing. And opening / closing means for controlling the flow of air and gas by closing or opening the passage.

  In one embodiment, the opening / closing means includes a tubular guide tube in which one or more concave guides are formed on the inner wall, and a convex guide formed on the outer wall so as to correspond to the concave guide. A tubular moving body in which a gas outlet communicating with the second gas inlet is formed at the end and a cam-like moving body cam is formed on the outer surface, and A damper is formed, a gas outlet is formed in a side portion of the damper, a valve body cam is formed in a shape corresponding to the movable body cam and meshed with each other, and a valve coupled to the motor A body, a spring that is built in the movable body and supports the movable body with an elastic force, and a cap that supports the spring and is coupled to an upper portion of the guide tube.

In one embodiment, the opening / closing means pushes up the moving body by contacting the tip ends of the moving body cam and the valve body cam while rotating the moving body cam formed on the moving body when the motor rotates. Therefore, the gas outlet is opened, and the damper of the valve body is rotated to open the second passage.
In one embodiment, the valve body further includes a sealing member that seals an inner lower end thereof.
In one embodiment, the motor is a synchronous motor.

From the characteristics of the configuration as described above, the present invention provides the following effects.
First, the amount of heat in the water heater can be selectively output as low or high as needed, and it can be controlled to the low or high heat required by the user, thus reducing fuel costs. be able to.
Secondly, the interior of the housing is divided into partition walls to form a first passage and a second passage, and only the primary air and the primary gas flow through the first passage, and the secondary passage through the second passage. Since only air and secondary gas flow, the turndown ratio can be easily adjusted by controlling the flow of air and gas on the second passage side.
Third, the secondary gas outlet is opened and closed by the rotation of the valve body, and the second passage is also opened and closed, so that the structure is very simple.

It is a perspective view which shows the dual venturi for combustion equipment of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a figure which shows the state which the moving body shown to FIG. 2a raised. It is a perspective view which shows the moving body of FIG. It is a perspective view which shows the moving body of FIG. 2 is a perspective view showing the valve body of FIG. It is a perspective view which shows an opening / closing means. It is a perspective view which shows an opening / closing means. It is the CC sectional view taken on the line of FIG. It is a figure which shows the positional relationship between the limit switch of the motor with which the dual venturi for combustion devices of this invention is equipped, and a motor.

  In order to facilitate the understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to provide a more thorough explanation of the present invention to those skilled in the art. Therefore, in order to provide a clearer description, the shape of elements in the drawings may be partially enlarged and expressed. It should be noted that the same reference numerals are used for the same members throughout the drawings. Detailed descriptions of well-known functions and configurations that may unnecessarily misunderstand the gist of the present invention are omitted.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings to describe the dual venturi for a combustion device of the present invention in detail.
1a is a perspective view showing a dual venturi for a combustion apparatus according to the present invention, FIG. 1b is a cross-sectional view taken along line AA in FIG. 1a, and FIG. 2a is a cross-sectional view taken along line BB in FIG. 2b is a diagram showing a state in which the movable body shown in FIG. 2a is raised, FIGS. 3a and 3b are perspective views showing the movable body of FIG. 1b, and FIG. 4 is a perspective view showing the valve body of FIG. 1b. is there. 5a and 5b are perspective views showing the opening / closing means, FIG. 6 is a cross-sectional view taken along the line C-C of FIG. 5a, and FIG. It is a figure which shows these positional relationships.

Referring to FIGS. 1 to 6, the dual venturi for a combustion device according to the present invention has a first gas inlet 14 and a second gas inlet 15 formed on one side of an upper portion, and an inner side defined by a partition wall 13. A cylindrical housing 10 is provided in which a first passage 11 and a second passage 12 are formed.
Further, a turbo fan (not shown) for supplying an air-fuel mixture (gas + air) flowing from the first passage 11 and the second passage 12 to the burner is coupled to the discharge port 16 of the housing 10. .

  On the other hand, the upper part is connected to the second gas inlet 15 at the central part inside the housing 10 and gas flows inward, and the damper 142 is rotated by the motor 180 provided outside the housing 10 to rotate the second gas inlet 15. Opening / closing means 100 for controlling the flow of air and gas by closing or opening the passage 12 is coupled. In addition, the motor 180 is preferably a synchronous motor. In this case, since an inexpensive synchronous motor that is generally used is used, the manufacturing cost can be reduced.

  The opening / closing means 100 includes a tubular guide tube 130 in which one or more concave guides 131 are formed on the inner wall, and a convex guide 122 formed on the outer wall so as to correspond to the concave guide 131, and guides in the guide tube 130. A tubular movement in which a gas outlet 123 communicating with the second gas inlet 15 is formed at the end and a cam-like movable body cam 121 is formed on the outer surface is moved along the length direction of the tube 130. A body 120 is provided. The inner surface of the guide tube 130 and the outer surface of the movable body 120 are formed to have a step, and a gas is prevented from leaking through a sealing ring 146 where the step contacts each other.

In addition, the damper 142 is coupled to the lower portion of the moving 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 inner portion is formed in a shape corresponding to the moving body cam 121. A valve body cam 141 is formed so as to mesh with each other, and a valve body 140 coupled to the motor 180 is provided.
The movable body 120 includes a spring 160 that supports the movable body 120 with an elastic force, and a cap 170 that supports the spring 160 and is coupled to the upper portion of the guide tube 130.

Meanwhile, a connecting member 190 is coupled to a lower portion of the valve body 140, and the connecting member 190 is coupled to a rotating shaft of the motor 180 to transmit a driving force generated by the motor 180 to the valve body 140. Further, a sealing member 145 that seals the inner lower stage is inserted into the lower stage of the valve body 140.
Meanwhile, a motor 180 that rotates the valve body 140 coupled to the connection member 190 by rotating the rotation shaft 181 to the connection member 190 is further provided outside the housing 10. The motor 180 provides a rotational force to the valve body 140, and projections 182 are formed on the rotation shaft 181 at intervals of 90 degrees, and the limit switch 201 is operated according to the rotation of the motor 180, and the rotation angle of the valve body 140. To control. The limit switch 201 is provided inside the switch box 200, and the switch box 200 is interposed between the housing 10 and the motor 180.

The operation state of the dual venturi for the combustion apparatus of the present invention configured as described above will be described.
First, the operation of supplying only the primary gas and the primary air in the water heater is performed in such a direction that the damper 142 of the valve body 140 flows the air and gas in the second passage 12 as shown in FIGS. 2a and 5a. In contrast, the second passage 12 is blocked by rotating vertically, and at the same time, the concave portion of the movable body cam 121 and the convex portion of the valve body 141, and the convex portion of the movable body cam 121 and the concave portion of the valve body 141 are in contact with each other. The gas outlet 123 of the moving body 120 is in contact with the sealing member 145 so that the second gas passage is blocked, and the gas outlet 143 is also blocked.
Therefore, since the air-fuel mixture in which air and gas are mixed flows only through the primary gas inlet 14 and the first passage 11 into the turbofan, the combustion device can be driven at a low heat quantity.

On the other hand, in order to drive the combustion device to a high heat quantity, as shown in FIGS. 2b and 5b, when the power is applied to the motor 180 and the valve body 140 is rotated 90 degrees, the damper 142 is moved to the second state. It rotates to coincide with the length direction of the passage 12.
At the same time, the valve body cam 141 formed on the inside by the rotation of the valve body 140 also rotates, so that the respective convex portions (pointed ends) of the first valve body cam 141 and the moving body cam 121 are in contact with each other, and The moving body cam 121 is pushed by the rotation of the valve body cam 141 to rise. At this time, the convex guide 122 is inserted into the concave guide 131, and the moving body 120 is easily raised inside the guide tube 130.

  Accordingly, since the valve body 140 rotates in a direction coinciding with the length direction of the second passage 12, the second passage 12 is opened, and at the same time, the gas outlet 123 of the moving body 120 as shown in FIGS. 2b and 5b. The secondary gas flows in through the gas outlet 143 while the lower end portion of the gas is separated from the sealing member 145, and the secondary gas flows into the second passage 12, whereby the secondary gas flows into the second passage 12. It is mixed with air and gas flowing in through the first gas inlet 14, and more air-fuel mixture is generated and flows into the turbofan, so that the combustion device can be driven at a high heat quantity.

  Thereafter, in order to drive the combustion device again at a low heat quantity, if the motor 180 is further rotated by 90 degrees, the state shown in FIGS. 1b, 2a and 5a is obtained, and the second passage 12 and the gas outlet 143 are connected. It will be cut off and will be driven to low heat. Here, when the spring 160 is built inside the moving body 120 and the valve body 140 rotates to close the second passage 12, the restoring force of the moving body 120 is increased.

Hereinafter, the limit switch 201 that controls the rotation of the motor 180 that drives the damper so that the combustion device operates at a low heat quantity or a high heat quantity as described above will be described.
Referring to FIG. 7, protrusions 182 are formed on the outer peripheral surface of the rotation shaft 181 of the motor 180 at intervals of 90 degrees, and the operation protrusion 202 is also provided on the limit switch 201 with the same circumference as the protrusion 182. It is comprised so that it may be located on. When the protrusion 182 is rotated at intervals of 90 degrees and the operating protrusion 202 is pressed, the current of the limit switch 201 is short-circuited and the rotation of the motor 180 is stopped.

Therefore, when driving the combustion device, if the protrusion 182 rotates 90 degrees to pressurize the operating protrusion 202, the limit switch 201 is turned off and the driving of the motor 180 is stopped. Since 140 also stops, the second passage 120 is opened or closed.
The embodiment of the dual venturi for a combustion device of the present invention described above is merely an example, and various modifications and other equivalent implementations are possible for those who have ordinary knowledge in the technical field to which the present invention belongs. It turns out that an example is possible. For this reason, it is understood that the present invention is not limited to the forms mentioned in the detailed description above. Therefore, the true technical protection scope of the present invention must be determined based on the technical idea of the appended claims. The invention is also to be understood as including the spirit of the invention as defined by the appended claims and any variations and equivalents and alternatives falling within the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Housing 11 1st channel | path 12 2nd channel | path 13 Partition 14 1st gas inlet 15 2nd gas inlet 100 Opening and closing means 120 Moving body 121 Moving body 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 Rotating shaft 182 Protrusion 190 Connecting member 200 Switch box 201 Limit switch 202 Operating protrusion

Claims (5)

A housing in which a first gas inlet 14 and a second gas inlet 15 are formed on one side of the upper part, and an inner side is partitioned by a partition wall 13 to form a first passage 11 and a second passage 12;
The housing 10 is provided on the inside, the upper part is connected to the second gas inlet 15 and gas flows inward, and a damper 142 is rotated by a motor 180 provided on the outside of the housing 10 to rotate the second gas inlet 15. Opening and closing means 100 for closing or opening the passage 12 to control the flow of air and gas;
A dual venturi for combustion equipment, characterized by comprising: The opening / closing means 100 includes
A tubular guide tube 130 in which one or more concave guides 131 are formed on the inner wall;
A concave guide 122 is formed on the outer wall so as to correspond to the concave guide 131, moves along the length direction of the guide tube 130 within the guide tube 130, and communicates with the second gas inlet 15 at the end. A tubular moving body 120 in which a gas outlet 123 is formed and a cam-like moving body cam 121 is formed on the outer surface;
The damper 142 is formed on the outer side, the gas outlet 143 is formed on the side of the damper 142, and the valve body cam 141 is formed in the shape corresponding to the moving body cam 121 on the inner side so as to mesh with each other. A valve body 140 formed and coupled to the motor 180;
A spring 160 built in the moving body 120 and supporting the moving body 120 with an elastic force;
A cap 170 that supports the spring 160 and is coupled to an upper portion of the guide tube 130;
The dual venturi for a combustion device according to claim 1, characterized by comprising: The opening / closing means 100 includes
As the motor 180 rotates, the moving body cam 121 formed on the moving body 120 rotates and the convex portions of the moving body cam 121 and the valve body cam 141 come into contact with each other to push up the moving body 120. The gas outlet 143 is opened, and the damper 142 of the valve body 140 is rotated so that the second passage 12 is opened. Dual venturi for combustion equipment. The valve body 140 includes:
The dual venturi for a combustion device according to claim 2, further comprising a sealing member (145) for sealing an inner lower end of the valve body (140). The motor 180 is
The dual venturi for combustion equipment according to claim 1, wherein the dual venturi is configured with a synchronous motor.

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