Patent Application
20140290590
1. Field of the Invention
The present invention relates to a hot water boiler. In particular, the present invention relates to a condensing type hot water boiler in which a hot water coil is placed within the interior of the firebox to enhance efficiency of heat exchange.
2. Description of the Related Art
Generally, heat and hot water boilers used in households are either oil boilers or gas boilers, distinguished by the fuel being used. Among these, recently gas boilers are primarily used for its convenience and minimization of air pollution, and liquefied natural gas (LNG) is used for its fuel. Gas boilers can be distinguished into many forms depending on the control method or sealing condition, and into condensing type and non-condensing type depending on the source of heat used to apply heat to the hot water.
Such hot water boiler is introduced in the registered Korean Patent 0473082.
Such condensing type hot water boiler 10 according to prior art becomes problematic when internal temperature and pressure increase, pressure is not distributed equally to the overall firebox 13, and in accordance to increased internal pressure the part with relatively lower durability is dented.
Also, condensing type hot water boiler 10 according to prior art exhausts flame and combustion gas of the firebox 13 after heat exchange occurs in the fire tube 15, thus there is severe loss of heat due to insufficient heat exchange.
The present invention is proposed in order to resolve the problems stated above, to provide a condensing type hot water boiler endurable to even high pressure within the interior of the firebox.
Another objective of the present invention is to provide a condensing type hot water boiler which increases heat transfer area of the firebox with highest flame temperature to enhance heat exchange efficiency.
Another objective of the present invention is to provide a condensing type hot water boiler than can continuously maintain heat exchange efficiency by maximizing fluid flow in the part of firebox with high water temperature, so that foreign substances do not adhere.
Said objectives and various advantages of the present invention will further be clarified by those skilled in prior art from preferable embodiments of the present invention.
The objective of the present invention can be achieved by a condensing type hot water boiler. The condensing type hot water boiler of the present invention includes a firebox casing that formulates a firebox in which fuel is combusted; a burner that ignites fuel furnished in the upper part of said firebox casing; a ventilator that supplies air to said firebox; a heat exchange casing, wherein heat is exchanged between hot water and the flame and combustion gas flowing in from said firebox, located at the lower part of said firebox casing; and a hot water coil formed to cover the inner wall of said firebox casing and in which hot water is received in the interior from said heat exchange casing for heat exchange with flame and combustion gas of the interior of said firebox.
According to a preferable embodiment, multiple fire tubes that are placed vertically erect in the interior or said heat exchange casing in which flame and combustion gas received from said firebox are flowing; and an upper part panel board and lower part panel board that support said fire tube so that it stands erect in the interior of said heat exchange casing are included.
According to a preferable embodiment, said firebox casing and said heat exchange casing are combined in a detachable condition, and a joint pipe that supplies hot water from said heat exchange casing to the hot water coil within the interior of said firebox casing is further included.
The condensing type hot water boiler according to the present invention enhances heat exchange ability since the hot water makes direct heat exchange with flame of highest temperature after exchanging heat with the fire tube. Therefore, the size of total heat exchanger can be minimized.
Also, the hot water coil is built in a circular pipe form to endure internal pressure.
Also, in case of a hot water storage type heat exchanger, foreign substances such as lime components may adhere to the part where water temperature is high and flow of hot water is delayed, thus heat exchange efficiency is deteriorated. However, the condensing type hot water boiler according to the present invention maximizes flow rate in the interior of the firebox casing which has high water temperature, thus foreign substances do not adhere, and heat exchange efficiency is continuously maintained.
Also, condensing type hot water boiler according to the present invention combines the firebox casing and heat exchange casing in a detachable condition so that partial replacement is made easy and have advantage in repair and maintenance.
For sufficient understanding of the present invention, the preferable embodiment of the present invention will be explained in reference to the attached figures. The preferable embodiment of the present invention can be modified in various forms, and the scope of the present invention must not be interpreted to be limited to the preferable embodiments explained in detail below. The present embodiment is provided for better understanding of the present invention to those skilled in prior art. Therefore, shapes of components in the figures may be expressed with exaggeration for emphasis of more precise explanation. Note that in each figure identical elements may be displayed with identical reference marks. Detailed descriptions of known functions and composition evaluated possible to unnecessarily hinder the main point of the present invention are omitted.
The condensing type hot water boiler 100 according to the present invention is formulated by two casings 110 and 130 combined in a detachable condition. Heat exchange fire tube component 120 is installed within the interior of the heat exchange casing 110 placed at the lower part, and a hot water coil 140, in which heat is exchanged with flame in the interior of the firebox 137, is installed in the firebox casing 130 placed in the upper part.
The upper part of firebox casing 130 includes a burner 160 in which fuel is ignited and ventilator 170 which supplies oxygen needed in combustion to the burner 160.
Heat exchange casing 110 is placed in the lower part of firebox casing 130. Heat exchange casing 110 is formulated as a cylindrical pipe with the top and bottom open. The surface of heat exchange casing 110 consists of direct water inlet 111 that brings hot water into the interior and direct water outlet 113 that takes hot water out to firebox casing 130.
Hot water brought in from direct water inlet 111 flows into the interior of firebox casing 130, circulates along hot water coil 140 and is exerted to the outside.
Heat exchange casing 110 is combined with firebox casing 130 in a detachable condition. In order for this, multiple lower part connection rings 115 are installed in the upper part of heat exchange casing 110. Lower part connection rings 115 are formulated at the position corresponding to that of the upper part connection ring 135 formulated in firebox casing 130 so that locking member (not shown)is locked.
Heat exchange fire tube component 120 is placed in the interior of heat exchange casing 110 to enable heat exchange between flame and combustion gas moving in from firebox 137 and hot water. Heat exchange fire tube component 120 is a sensible/latent heat comprehensive heat exchange component that uses sensible heat and latent heat of combustion gas. Heat exchange fire tube component 120 consists of multiple fire tubes 125 and an upper part panel board 123 and lower part panel board 121 that support fire tube 125 so that it stands erect in the interior of heat exchange casing 110.
Fire tube 125 is formulated as a hollow pipe with the top and bottom open, and is placed through firebox 137. Through the opening at the top of fire tube 125, flame and combustion gas of firebox 137 are received and transported. Flame and combustion of high temperature moving along the interior of fire tube 125 exchanges heat with hot water wrapping around fire tube 125.
In the upper part panel board 123, flame inlet 123a, through which flame and combustion gas of firebox casing 130 flows into fire tube 125, is formulated penetrating the position where fire tube 125 is located. A flame outlet (not shown) is also formulated penetrating the identical position of lower part panel board 121.
Firebox casing 130 is positioned at the upper part of heat exchange casing 110. Firebox casing 130 and heat exchange casing 110 are combined in a detachable condition. The lower part of firebox casing 130 consists of an upper part connection ring 135. Due to the detachable structure of such firebox casing 130 and heat exchange casing 110, repair and changing parts is made easy when failures arise.
Hot water inlet 131 through which hot water flows into the interior and hot water outlet 133 through which hot water flows out are each installed on the outer wall of firebox casing 130.
Burner 160 is placed in the upper part of firebox casing 130. In the interior, firebox 137, wherein fuel ignited by burner 160 is combusted, is formulated.
Hot water coil 140 is installed on the inner wall of firebox casing 130. Hot water coil 140 is formulated by a metal pipe winding multiple times. Hot water coil 140 is connected to hot water inlet 131 through hot water inlet pipe 141 formed at one end, and is connected to hot water outlet 133 through hot water outlet pipe 143 formed at the other end.
Hot water coil 140 is formulated on the inner wall of firebox casing 130 to increase hot water heat transfer area. Depending on the length that hot water coil 140 winds in firebox casing 130 the hot water heat transfer area may be increased up to 60 percent. Hot water flowing within the interior of hot water coil 140 is able to directly absorb heat from the flame and combustion of highest temperature, thus heat exchange rate is increased.
Also, since the temperature of the interior of firebox 137 is uniformly distributed disregarding section, hot water flowing throughout hot water coil 140 is able to evenly absorb heat without deviation of temperature. Therefore, since deviation of temperature in the hot water is minimal, water pressure of the hot water is maintained consistent.
Therefore, water pressure approved by hot water coil 140 winding along the inner wall of firebox casing 130 is also maintained consistent, thus partial damage of firebox casing 130 can also be prevented.
As displayed, hot water coil 140 is formulated winding along the inner wall of firebox casing 130 in a single layer or can also be formulated consisting of multiple layers.
Meanwhile, direct water moves through joint pipe 150 for heat exchange casing 110 and firebox casing 130. Joint pipe 150 is connected to direct water outlet 113 of heat exchange casing 110 at one end, and is connected to hot water inlet pipe 133 of firebox casing 110 at the other end. Herein, for each connection between firebox casing 130, heat exchange casing 110, and joint pipe 150, a sealing solution is applied to prevent leakage and the components are connected after being assembled using brackets(not shown).
The operation procedure of condensing type hot water boiler 100 according to the present invention that consists of such composition is explained in reference to figures
Through the direct water inlet 111 of heat exchange casing 110, hot water flows within the interior of heat exchange casing 110. Hot water in the interior of heat exchange casing 110 flows into hot water coil 140 of firebox casing 130 bypassing direct water outlet 113 and joint pipe 150.
When burner 160 is ignited and ventilator 170 begins operating, combustion of fuel at firebox 137 is initiated. Flame and combustion gas are formed in firebox 137 as a result of fuel combustion.
Flame and combustion gas move through fire tube 125 connected to the lower part of firebox 137, and heat exchange occurs with hot water wrapping around fire tube 125. The hot water that exchanged heat with combustion gas in the interior of fire tube 125 once again moves to hot water coil 140 of firebox casing 130, is rapidly heated by hot flame and combustion gas, and exerted to the outside.
As explained above, the condensing type hot water boiler according to the present invention enhances heat exchange ability since the hot water makes direct heat exchange with flame of highest temperature after exchanging heat with the fire tube. Therefore, the size of total heat exchanger can be minimized.
Also, the hot water coil is built in a pipe form wrapping around the inner wall of the firebox casing to endure internal pressure up to 30 kg/cm2.
Also, in case of a hot water storage type heat exchanger, foreign substances such as lime components may adhere in the part where water temperature is high and flow of hot water is delayed, thus heat exchange efficiency is deteriorated. However, the condensing type hot water boiler according to the present invention maximizes flow rate in the interior of the firebox casing which has high water temperature, thus foreign substances do not adhere, and heat exchange efficiency is continuously maintained.
Also, condensing type hot water boiler according to the present invention combines the firebox casing and heat exchange casing in a detachable condition so that partial replacement is made easy and have advantage in repair and maintenance.
The prior explained embodiments of the condensing type hot water boiler of the present invention are representative, but those skilled in prior art will know that various modifications and other embodiments can be made from them. Therefore it will be understood that the present invention is not limited to forms described in detailed descriptions above. Thus, the technical protection scope of the present invention must be defined by descriptive ideas in the attached patent claims. Also, the present invention must be understood to include the spirit defined by the attached claims of the present invention and all modifications, equivalents, and substitutes within the protection scope.
