Hot water boiler with increased heat transfer surface area

Abstract

The present invention relates to a storage-type boiler having a heat transfer surface area increasing structure in which the contact area between the flame and combustion gas generated in a burner and the flue is increased, comprising: a water tank having a direct water inlet and a hot water discharge part formed therein; a combustion chamber formed by being connected to the water tank in one direction; a combustion device installed in the combustion chamber for ejecting a flame and combustion gas into the combustion chamber; a combustion gas discharge part formed by being connected to the water tank in the other direction; a plurality of flues arranged lengthwise inside the water tank, with one end open to the combustion chamber and the other end open to the combustion gas discharge part; and a first heat transfer surface area increasing structure provided at one end of the flue to increase the contact area when the flame and combustion gas come into contact with the end of the flue.

Description

Technology Field

[0001] The present invention relates to a storage type boiler, and more specifically, to a storage type boiler having a heat transfer surface area increase structure in which the contact area between the flame and combustion gas generated from the burner and the flue is increased. Background Technology

[0002] Generally, boilers are classified into storage-type boilers and instantaneous-type boilers depending on the method of heating hot water.

[0003] In instantaneous boilers, cold water supplied through a pipe passes through a heat exchanger, is instantaneously heated by a burner, and then supplied to the user. Although instantaneous boilers offer a relatively fast heating speed, they have the problem of not being able to supply sufficient hot water or heating water because the amount of cold water that can be heated at once is limited.

[0004] On the other hand, since the hot water supplied through the direct water pipe is always heated to an appropriate high temperature within the hot water tank, the user can use hot water or heating water immediately, and it has the advantage of supplying a larger amount of hot water or heating water compared to instantaneous types.

[0005] Generally, a storage-type boiler includes a water tank, a heat exchanger comprising a plurality of flues installed inside the water tank, a burner that ejects flames and combustion gases into the heat exchanger, and a combustion gas discharger that discharges the combustion gases passing through the heat exchanger to the outside.

[0006] Direct water supplied from the outside is heated within the water tank through heat exchange with combustion gases flowing through the flues as it comes into contact with them. The hot water thus generated is supplied to the outside through hot water pipes by the operation of a circulation pump (not shown).

[0007] The flue is formed in the shape of a circular tube of a constant diameter and is positioned vertically in the water tank. The angle of contact between the flame and combustion gases ejected from the burner and the flue varies depending on the position of the flue.

[0008] According to a conventional storage-type boiler configured in this manner, when the flame and combustion gas come into contact with the flue tubes, the contact area may vary depending on the arrangement of the flue tubes, and consequently, the amount and velocity of combustion gas flowing into the flue tubes may vary.

[0009] In particular, since the flue tubes are formed as pipes of a fixed diameter, there is inevitably a limitation on the contact area between the flame and combustion gases and the flue tubes. Furthermore, depending on the placement of the flue tubes, the contact area with the flame and combustion gases in a specific tube may be relatively smaller compared to others, and the inflow of combustion gases into the tubes may not be smooth. Consequently, the overall heat exchange efficiency of conventional storage-type boilers is bound to be reduced. The problem to be solved

[0010] The present invention was devised to solve the problems of the conventional technology described above, and aims to provide a storage-type boiler having a heat transfer surface area increase structure capable of improving heat exchange efficiency by increasing the contact area between the flame and combustion gas generated from the burner and the flue. means of solving the problem

[0011] According to a preferred embodiment of the present invention for achieving the above-mentioned purpose, a storage-type boiler having a heat transfer surface area increasing structure comprises: a water tank having a direct water inlet and a hot water discharge outlet; a combustion chamber formed by being connected to the water tank in one direction; a combustion device installed in the combustion chamber to eject a flame and combustion gas into the combustion chamber; a combustion gas discharge section formed by being connected to the water tank in the other direction; a plurality of flues arranged lengthwise inside the water tank, with one end open to the combustion chamber and the other end open to the combustion gas discharge section; and a first heat transfer surface area increasing structure provided at one end of the flues to increase the contact area when the flame and combustion gas come into contact with the end of the flues.

[0012] The first heat transfer surface area increasing structure is formed in such a way that the opening cross-section of the flue expands toward the end.

[0013] The first heat transfer surface increasing structure includes one of a straight inclined surface, a curved inclined surface, and a stepped inclined surface formed at one end of the tube.

[0014] A storage-type boiler having a heat transfer surface area increasing structure according to the present invention further includes a second heat transfer surface area increasing structure provided inside a flue tube to increase the heat exchange area between the water in the water tank and the combustion gas flowing inside the flue tube.

[0015] The second heat transfer surface area increasing structure is provided in the form of a protrusion inside the tube.

[0016] The second heat transfer surface area increasing structure includes: a projection-shaped protrusion protruding inwardly toward the flue; and an opening formed inside the protrusion that is open to the outside of the flue and filled with water from a water tank.

[0017] When multiple protrusions are provided, the protrusions are arranged radially with respect to the center of the association.

[0018] Multiple micro-protrusions are formed on the outer and inner surfaces of the protrusion. Effects of the invention

[0019] According to the present invention, a storage-type boiler having a heat transfer surface area increasing structure is provided with a first heat transfer surface area increasing structure that increases the contact area when a flame and combustion gas come into contact with one end of a flue, thereby increasing the amount of heat transferred from the high-temperature flame and combustion gas to the flue and allowing the combustion gas to flow smoothly into the flue, so that the heat exchange efficiency can be improved.

[0020] In addition, according to the low-temperature boiler having a heat transfer surface area increasing structure of the present invention, by providing a second heat transfer surface area increasing structure in the form of a protrusion inside the flue through which the combustion gas passes, the contact area between the combustion gas and the flue, and the contact area between the water and the flue are increased, thereby further improving the heat exchange efficiency between the combustion gas and the water. Brief explanation of the drawing

[0021] FIG. 1 is a drawing showing the internal structure of a storage-type boiler having a heat transfer surface area increase structure according to a preferred embodiment of the present invention. Figure 2 is a plan view showing the installation state of the associations illustrated in Figure 1. Figure 3 is an enlarged view of the first heat transfer area increasing structure formed at the inlet of the association shown in Figures 1 and 2. FIG. 4 is a drawing showing another embodiment of the first heat transfer area increasing structure illustrated in FIG. 3. FIG. 5 is a drawing showing another embodiment of the first heat transfer area increasing structure illustrated in FIG. 3. FIG. 6 is a cross-sectional view of a conduit showing a second heat transfer area increasing structure additionally provided inside the conduit shown in FIG. 2. FIG. 7 is a drawing showing another embodiment of the second heat transfer area increasing structure illustrated in FIG. 6. Specific details for implementing the invention

[0022] Hereinafter, a storage-type boiler having a structure for increasing the heat transfer surface area according to preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0024] FIG. 1 is a drawing showing the internal structure of a storage-type boiler having a heat transfer surface area increase structure according to a preferred embodiment of the present invention, and FIG. 2 is a plan view showing the installation state of the pipes shown in FIG. 1.

[0025] A storage-type boiler having a heat transfer area increasing structure according to a preferred embodiment of the present invention includes a burner (100), a casing (200), a heat exchanger (300), a combustion gas discharger (400), a first heat transfer area increasing structure, and a second heat transfer area increasing structure.

[0026] The burner (100) is a combustion device installed downward on the upper part of the combustion chamber (220) to eject flames and combustion gases generated during the process of fuel combustion into the combustion chamber (220).

[0027] The casing (200) includes a water tank (210) filled with water inside, and a combustion chamber (220) formed in a U-shaped groove on the upper part of the water tank (210). The upper part of the water tank (210) is formed to surround the combustion chamber (220). An upper end plate (211) is provided on the bottom part of the combustion chamber (220) to prevent water from the water tank (210) from leaking into the combustion chamber (220). The upper end plate (211) forms the bottom of the combustion chamber (220). A lower end plate (212) is provided on the lower part of the water tank (210) to prevent water from the water tank (210) from leaking into the combustion gas discharge part (400).

[0028] A direct water inlet (213) for introducing direct water into the water tank (210) from the outside is formed on the lower side of the water tank (210), and a hot water discharge part (214) for discharging hot water inside the water tank (210) to the outside is formed on the upper side of the water tank (210) that surrounds the combustion chamber (220).

[0029] The heat exchanger (300) is composed of a plurality of tubes (310) arranged vertically in the internal space of the water tank (210). The tubes (310) are formed in the shape of hollow tubes, and one end is open to the combustion chamber (220) by penetrating the upper end plate (211), and the other end is open to the combustion gas discharge section (400) by penetrating the lower end plate (212). The combustion gas ejected into the combustion chamber (220) is introduced through one end of the tubes (310), then flows downward, and is discharged to the combustion gas discharge section (400) through the other end.

[0030] The combustion gas discharge section (400) is formed connected to the lower part of the water tank (210) and provides a path for discharging combustion gas discharged from the heat exchange section (300) to the outside.

[0031] The positions of the burner (100), combustion chamber (220), and combustion gas discharge section (400) can be varied with respect to the water tank (210). For example, in this embodiment, the burner (100) is installed downward from above the water tank (210) and a structure is applied in which the combustion gas passes through the interior of the water tank (210) from top to bottom and is discharged to the outside. However, this is not limited to this, and a structure may also be applied in which the burner (100) is installed upward from below the water tank (210) and the combustion gas passes through the interior of the water tank (210) from bottom to top and is discharged to the outside.

[0032] The first heat transfer area increasing structure is provided at one end opening of the flue (310) and is formed such that the cross-section of the opening expands as it extends from the end, thereby increasing the contact area when the flame and combustion gas ejected into the combustion chamber (220) come into contact with the one end opening of the flue (310). In addition, the first heat transfer area increasing structure facilitates the smooth inflow of combustion gas from the combustion chamber (220) to the flue (310). The first heat transfer area increasing structure will be described in detail in FIGS. 3 to 5.

[0033] The second heat transfer area increasing structure is provided inside the flue (310) to increase the heat exchange area between the water in the water tank (210) and the combustion gas flowing inside the flue (310). That is, the second heat transfer area increasing structure is provided in the form of a protrusion inside the flue (310) to increase the contact area between the combustion gas passing through the flue (310) and the flue (310), thereby improving the heat exchange efficiency between the combustion gas flowing through the flue (310) and the water in the water tank (210). The second heat transfer area increasing structure will be explained in detail in FIGS. 6 and 7.

[0034] Meanwhile, the upper plate (211) and the lower plate (212) have a downwardly sloping surface from the edge to the center. The sloping surface may be formed in a stepped manner. The installation height of the connecting members (310) may also vary in correspondence with the sloping surfaces of the upper plate (211) and the lower plate (212). That is, the installation height of the connecting members (310) decreases as they go from the edge to the center of the upper and lower plates (211) (212).

[0035] As described above, the upper plate (211) forms the bottom of the combustion chamber (220), and one end of the tubes (310) penetrates the upper plate (211) and opens into the combustion chamber (220).

[0036] The ejection surface of the burner (100) forms a curved surface, so that the flame and combustion gas are ejected radially from the burner (100).

[0037] Through the installation structure of the above-described flues (310) and the shape of the ejection surface of the burner (100), the distance between the ejection surface of the burner (100) and each flue (310) can be maintained uniformly. Accordingly, the flame and combustion gas ejected from the burner (100) reach and act upon the flues (310) at a uniform speed and amount. That is, the amount of heat transferred to each flue (310) through the flame and combustion gas can be uniformly distributed.

[0039] FIG. 3 is an enlarged view of a first heat transfer area increasing structure formed at the inlet of the association shown in FIG. 1 and FIG. 2, FIG. 4 is a view showing another embodiment of the first heat transfer area increasing structure shown in FIG. 3, and FIG. 5 is a view showing yet another embodiment of the first heat transfer area increasing structure shown in FIG. 3.

[0040] The first heat transfer surface area increasing structure (500) is formed such that the inner diameter of the inlet of the flues (310) expands toward the end, thereby increasing the contact area when the flame and combustion gas ejected from the burner (100) come into contact with the opening of one end of the flue (310). That is, the heat transfer surface area transferred from the flame and combustion gas to one end of the flue (310) can be increased.

[0041] In addition, due to the first heat transfer surface area increase structure (500), the inflow of combustion gas through one end of the flue (310) can be smoothly carried out, and the flow rate of the combustion gas can be maintained quickly.

[0042] The first heat transfer surface area increasing structure (500) may be formed as a straight inclined surface at one end of the tube (310) as shown in FIG. 3, may be formed as a curved inclined surface at one end of the tube (310) as shown in FIG. 4, and may be formed as a stepped inclined surface at one end of the tube (310) as shown in FIG. 5.

[0043] The first heat transfer surface area increasing structure (500) having various embodiments as described above may be provided with only the same embodiment in all the connecting tubes (310), or may be provided with different embodiments depending on the installation location of the connecting tubes (310).

[0045] FIG. 6 is a cross-sectional view of a conduit showing a second heat transfer area increasing structure additionally provided inside the conduit shown in FIG. 2, and FIG. 7 is a drawing showing another embodiment of the second heat transfer area increasing structure shown in FIG. 6.

[0046] The second heat transfer surface area increasing structure (600) is provided lengthwise inside the flues (310) to increase the heat exchange area between the combustion gas flowing inside the flues (310) and the water inside the water tank (210), and can be provided in the form of a protrusion inside the flues (310).

[0047] This second heat transfer surface area increasing structure (600) includes a protrusion (610) in the form of a projection protruding inwardly into the flue (310), and an opening (620) formed in the form of a space inside the protrusion (610) and open to the outside of the flue (310) to communicate with the internal space of the water tank (210) and filled with water.

[0048] At least one protrusion (610) may be provided, and if multiple protrusions are provided, they may be arranged radially with respect to the center of the linkage (310). As shown in FIG. 7, multiple micro-protrusions (630) may be formed protruding from the outer and inner surfaces of the protrusion (610) to increase the heat transfer area.

[0050] As described above, a storage-type boiler having a structure for increasing the heat transfer area according to a preferred embodiment of the present invention has been described in detail with reference to the attached drawings; however, the present invention is not limited to the embodiments described above and can be implemented with various modifications within the scope of the claims. Explanation of the symbols

[0051] 100 : Burner 200 : Casing 210 : Water tank 211 : Upper end plate 212: Lower end plate 213: Direct water inlet 214: Hot water discharge section 220: Combustion chamber 300 : Heat exchanger 310 : Flue 400: Combustion gas exhaust section 500: First heat transfer surface area increasing structure 600: Second heat transfer surface area increasing structure 610: Protrusion 620 : Opening 630 : Fine protrusion

Claims

Claim 1 A water tank formed with a direct water inlet and a hot water discharge; a combustion chamber formed by being connected in one direction to the water tank; a combustion device installed in the combustion chamber to eject a flame and combustion gas into the combustion chamber; a combustion gas discharge section formed by being connected in the other direction to the water tank; a plurality of tubes arranged lengthwise inside the water tank, one end of which is open to the combustion chamber and the other end of which is open to the combustion gas discharge section; a first heat transfer area increasing structure provided at one end of the tubes to increase the contact area when the flame and combustion gas come into contact with the end of the tubes; and a second heat transfer area increasing structure provided lengthwise inside the tubes to increase the heat exchange area between the water inside the water tank and the combustion gas flowing inside the tubes, wherein the first heat transfer area increasing structure is formed as a straight inclined surface or a curved inclined surface such that the cross-sectional area continuously expands toward the end, and the second heat transfer area increasing structure is provided lengthwise inside the tubes and includes a protrusion in the form of a projection protruding inwardly from the tubes. A storage-type boiler having a heat transfer surface area increasing structure, comprising a space formed inside the above-mentioned protrusion, and an opening that is open to the outside of the connection and filled with water from a water tank. Claim 2 A low-temperature boiler having a heat transfer surface increase structure, wherein, in the first paragraph, an upper end plate is provided in the bottom portion of the combustion chamber through which one end of a flue penetrates, the combustion device is configured such that the ejection surface is formed as a curved surface to allow flames and combustion gases to be ejected radially, the upper end plate is provided with a stepped inclined surface that slopes downward from the edge to the center, the installation height of the flue decreases from the edge to the center in correspondence with the height of the upper end plate, and the distance between the ejection surface of the combustion device and the flues is maintained uniformly. Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 A water-storage boiler having a heat transfer surface area increasing structure, wherein, in the case of claim 1, a plurality of the above-mentioned protrusions are provided, and the protrusions are arranged radially with respect to the center of the above-mentioned linkage. Claim 8 A water-storage type boiler having a heat transfer surface area increasing structure, wherein, in claim 1, a plurality of fine protrusions are formed on the outer and inner surfaces of the protrusion.

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