TECHNICAL FIELD

The present invention relates to a hot water storage-type boiler having both a heat amount proportional control function and a backflow prevention function and, more specifically, to a hot water storage-type boiler having both a heat amount proportional control function and a backflow prevention function to prevent backflow of exhaust gas with a simple structure.

BACKGROUND ART

In general, gas boilers use gas as fuel and water as heat medium for heating. Especially in the case of a boiler for combined use of hot water, circulation water for heating is circulated inside the boiler through a three-way valve, and the boiler is a combustor that heats supplying water in a form of indirect heat exchange to enable using hot water as well. These gas boilers are classified into instantaneous-type boilers and hot water storage-type boilers according to a hot water supplying method.

An instantaneous-type boiler is heated by the main heat exchanger or hot water storage heat exchanger in the boiler when needed to supply hot water. Since such an instantaneous-type boiler quickly converts cold water into hot water by being instantaneously heated by a large-capacity electric heater, and a separate hot-water tank is not used, whereby a small sized boiler may also be hung on a wall. However, in the case of indoor heating and the like using the instantaneous-type boiler, there is a problem in that a large amount of electricity is consumed by using the large-capacity electric heater, incurring an excessively high cost for heating.

The hot water storage-type boiler is designed to store hot water in a hot water storage tank so that hot water may be used instantaneously when needed, which is different from the instantaneous-type boiler that operates a burner and generates hot water when needed. The hot water storage-type boiler is configured to provide with a heat exchanger inside the hot water storage tank so that the direct water stored in the hot water storage tank is heated to make hot water of a suitable high temperature by the heat exchange unit. Accordingly, users may use hot water or water for heating instantaneously.

FIG. 1is a view illustrating a conventional gas boiler. Referring toFIG. 1, in the conventional gas boiler, a burner3is installed to burn air and gas supplied through an intake duct depending on an operation of a blower2at the upper portion of the combustor1. In addition, a sensible heat exchanger5and a latent heat exchanger6are arranged in order under the burner3. Exhaust gas passing through the latent heat exchanger6is discharged to the outside through an exhaust duct7. Condensate water generated in the heat exchange process is dropped into an exhaust hood8and collected in the condensate-water receiver10, and then discharged to the outside.

Since such a conventional gas boiler does not have a separate backflow prevention means for preventing the exhaust gas combusted in the burner of the combustor from backflowing in a direction of the intake duct, the exhaust gas flows back in the direction of the intake duct as it is. This situation decreases the efficiency of the combustor and causes a problem in that exhaust gas may flow back into the house.

Some boilers install a separate damper on the outside of the combustor to solve this problem, but such a damper also have a problem that requires a separate space for installing the damper on the outside of the combustor.

DISCLOSURE

Technical Problem

An objective of the present invention for solving the problems of the related art as described above is to provide a hot water storage-type boiler having both a heat amount proportional control function and a backflow prevention function to prevent backflow of exhaust gas with a simple structure.

Technical Solution

In order to achieve the objective of the present Invention, there is a hot water storage-type boiler having both a heat amount proportional control function and a backflow prevention function. The hot water storage-type boiler includes: a casing having a space therein and providing an independent firebox on an upper portion of the space; a burner body mounted on an upper portion of the firebox and provided therein with a burner to inject a flame into the firebox; a blower body connected to the burner body and provided therein with a blower to send air to the burner body; and a check valve provided on one side of the burner body coupled to the blower body or on one side of the blower body coupled to the burner body, and moving the air supplied from the blower toward the burner, wherein the check valve is configured to be opened by pressure of the air supplied from the blower and to be closed by pressure of gas generated by the flame injected by the burner.

In addition, a blower duct may extend at one side of the blower body to deliver outside air sent by the blower to the burner body, the burner body may have a burner duct extending in a direction of the blower duct to be connected to the blower duct, and the check valve may be provided inside the blower duct or the burner duct.

In addition, the check valve may include: a valve body fitted into an inner circumferential edge of the blower duct or the burner duct and having a penetration part provided on one surface thereof; and an opening and closing part which is provided to open and close the penetration part and is hinge-coupled to the valve body to be opened in a direction of the burner.

In addition, the hot water storage-type boiler may further include a guider protruding toward the burner along an edge of the valve body, wherein the guider protrudes in an inclined state to recede from the edge of the valve body toward a lower side of the valve body, and the opening and closing part is closely adhered to be inclined to the guider in a hinged state on an upper side of the valve body.

In addition, a weight plate may be provided in the opening and closing part.

In addition, the weight plate may be detachably coupled to the opening and closing part and configured to adjust weights of the weight plate.

In addition, an inner recess may be provided inside the opening and closing part in contact with the valve body, and a sealing unit may be mounted in the inner recess.

In addition, the sealing unit may have a double protrusion.

In addition, the hot water storage-type boiler may further include: a plurality of fire tubes in which one side thereof is connected to a lower surface of the firebox and the other side thereof extends to a lower direction of the space; and an exhaust gas part provided at a lower portion of the casing and connected to the fire tubes, wherein the flame injected by the burner is moved along insides of the fire tubes while heating the fire tubes and then moved to the exhaust gas part, and water supplied to one side of the space is moved to the other side of the space after passing through the space.

Advantageous Effects

According to the present invention, since an opening area of a check valve is variable by a pressure of air supplied from a blower, an amount of air supplied from the blower to a burner body is also variable, through which an effect of heat amount proportional control is made possible. In addition, when the check valve closes a penetrating unit by a pressure of gas generated by the burner, there is an effect of blocking the gas generated by the burner from backflowing.

In addition, since the check valve is integrally coupled to a burner duct, there is a convenient effect of assembly. Further, since the check valve is built in the burner duct, the check valve does not protrude to the outside, thereby having an effect that a separate space is not needed.

In addition, since a weight plate is provided to be detachable to an opening and closing part of the check valve, there is an effect that the turndown ratio may be controlled by adjusting the weights of the weight plate.

In addition, since an inner side sealing unit mounted on the opening and closing part of the check valve is provided with a double protrusion for the inner side sealing unit to be in close contact with a guider, there is an effect that airtightness is improved. In addition, the opening and closing part and the inner side sealing unit are manufactured by double injection, thus there is an effect of reducing the production cost.

