Hot water storage-type boiler having both heat amount proportional control function and backflow prevention function

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 comprising:

• 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;
• 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,
• further comprising;
• a plurality of fire tubes, 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 boiler is configured to permit
• the flame injected by the burner to move along insides of the fire tubes while heating the fire tubes and then to move to the exhaust gas part, and water supplied to one side of the space to move to the other side of the space after passing through the space,
• wherein the blower body comprises a blower duct that extends at one side of the blower body and is configured to deliver outside air sent by the blower to the burner body,
• wherein the burner body comprises a burner duct that extends in a direction of the blower duct to be connected to the blower duct,
• wherein the check valve is provided inside the blower duct or the burner duct,
• wherein the check valve comprises:
• a valve body that is fitted into an inner circumferential edge of the blower duct or the burner duct and has a penetration part provided on one surface thereof;
• and
• an opening and closing part configured to open and close the penetration part and configured to be hinge-coupled to the valve body to be opened in a direction of the burner,
• wherein the opening and closing part comprises:
• an inner recess provided inside the opening and closing part in contact with the valve body;
• and
• an inner sealing unit mounted in the inner recess,
• wherein the inner recess and the inner side sealing unit are configured to prevent the gas generated by the flame injected by the burner from flowing back,
• wherein the check valve further comprises:
• a weight plate attached to a concave area of the opening and closing part,
• wherein an area provided with the weight plate and the concave area of the opening and closing part is formed by denting from an outside to an inside of the check valve and is configured not to collide with the burner duct when the opening and closing part opens the penetration part, and
• wherein the check valve further comprises:
• an outer recess formed on an outer side of the opening and closing part;
• and
• an outer sealing unit that is mounted in the outer recess and has a protrusion,
• wherein the protrusion is configured to absorb impact while abutting on the burner duct when the opening and closing part opens the penetrating part.