KR20110107014A - Heat exchanger for gas boiler - Google Patents

Abstract

It is an object of the present invention to provide a heat exchanger for a gas boiler which can improve heat exchange efficiency by increasing exhaust resistance without causing flow interference between the exhaust gas and the heat exchange tube.
In the heat exchanger for a gas boiler of the present invention for realizing this, in the heat exchanger in which a plurality of tubes having a rectangular cross section are installed adjacent to each other and the heat exchange is performed while the exhaust gas passes through the passages between the tubes, It is characterized by being disposed inclined based on the direction in which the exhaust gas flows.

Description

Heat Exchanger for Gas Boiler {HEAT EXCHANGER FOR GAS BOILER}

The present invention relates to a heat exchanger for a gas boiler having a plurality of heat exchange tubes having a rectangular cross section. More particularly, the tube is inclined with respect to the direction in which the exhaust gas flows to increase exhaust resistance with the exhaust gas. The present invention relates to a heat exchanger for a gas boiler capable of improving heat exchange efficiency.

In general, the heating device is provided with a heat exchanger that performs heat exchange between the exhaust gas and the heating water by combustion of the fuel to perform heating using the heated heating water or supply hot water.

A heat exchanger widely used in the related art has a structure in which a tube in which heating water flows into an inner space and a heat transfer fin having a shape protruding from the surface thereof are combined.

However, the heat exchanger having such a structure has a high heat exchange efficiency due to a wider heat transfer area, but has a disadvantage in that a lot of materials and a lot of processes have a high cost.

In order to improve this problem, two kinds of heat exchangers without heating fins have been devised and used. The principle of heat exchangers without heating fins is to use the characteristics of laminar flow, which is the flow characteristic of exhaust gas, and the characteristics of turbulent flow. .

The heat exchanger using the laminar flow characteristics does not use heating fins, deforms the cross section of the tube in which the heating water flows into a rectangle, maintains the space between the tubes at 1 mm or less, and makes the tube height be 36 mm or less. It is.

The heat exchanger of such a structure has the advantage of high heat transfer efficiency because the exhaust gas passes through the space between the tubes, so that the boundary layer of temperature is not formed, but there is a problem of large exhaust resistance due to the small space between the tubes, Due to this, there is a disadvantage that it is not suitable for applying a large capacity heat exchanger.

On the other hand, the heat exchanger using the characteristics of the turbulent flow improves the heat transfer efficiency by forming irregularities on the surface of the heat exchanger to generate turbulence in the exhaust gas. The heat exchanger having such a structure can greatly reduce the exhaust resistance, but basically has a shape similar to that of the heat exchanger used in the tubular boiler, which is disadvantageous due to the large amount of materials and the complicated manufacturing process.

Hereinafter, the coupling structure and the flow characteristics of the exhaust gas of the heat exchanger for the tubular gas boiler having a rectangular cross section among the heat exchanger will be described with reference to the accompanying drawings.

1 is an exploded perspective view showing a heat exchanger for a conventional gas boiler, FIG. 2 is a plan sectional view in a state in which the heat exchanger shown in FIG. 1 is coupled, and FIG. 3 shows an exhaust gas passing between tubes in a heat exchanger for a conventional gas boiler. Figure showing.

Conventional tubular gas boiler heat exchanger (1), a plurality of tubes 10 having a rectangular cross section is arranged in parallel adjacent to each other, both ends of the tube (10) tube connecting members (20, 40) It is connected to the junction, the outer side of the tube connecting member (20, 40) has a structure in which the heating water inlet 31 and the case (30, 50) formed with the heating water outlet 51 is coupled. Therefore, as shown in FIG. 2, the heating water introduced through the heating water inlet 31 is discharged through the heating water outlet 51 after being passed through the plurality of tubes 10 and supplied to the heating source.

Here, the heating water flowing along the inside of the tube 10 is heated through heat exchange with the exhaust gas passing between the tubes 10. Conventionally, as shown in FIG. 3, since the plurality of tubes 10 are arranged in parallel with the inflow direction of the exhaust gas, the exhaust gas passes through the space between the tubes 10 as it is. It is.

Of course, in the case of the heat exchanger using the characteristic of the laminar flow, a method of increasing the exhaust resistance by arranging the tubes 10 in parallel with the inflow direction of the exhaust gas and forming a narrow gap between the tubes 10 is possible. Can be. However, in the structure in which the interval between the tubes 10 is increased beyond the range where the temperature boundary layer occurs, when the tube 10 is arranged in parallel with the inflow direction of the exhaust gas, the side of the long side of the tube 10 and the exhaust gas There was a problem that the heat exchange efficiency is lowered because the exhaust resistance at the contact portion is lowered.

In order to solve the problem that the heat exchange efficiency is deteriorated when the tube 10 is disposed parallel to the inflow direction of the exhaust gas, a separate device such as a turbulence must be installed to induce turbulent flow of the exhaust gas. In this case, there is a problem in that the overall structure of the heat exchanger becomes complicated and the cost increases.

The present invention has been made to solve the above problems, and an object thereof is to provide a heat exchanger for a gas boiler which can improve heat exchange efficiency by increasing exhaust resistance without causing flow interference between the exhaust gas and the heat exchange tube. .

In the heat exchanger for a gas boiler according to the present invention for realizing the object as described above, a plurality of tubes having a rectangular cross section are installed adjacent to each other, and the heat exchange is performed while exhaust gas passes through a passage between the tubes. The tube is inclined with respect to the direction in which the exhaust gas flows.

In this case, the inclination angle of the tube may be configured in a range of 20 ° to 79 °.

In addition, the tube may be configured such that the arrangement of the tubes disposed on both sides inclined in a symmetrical form with respect to each other based on the tube disposed in the center.

In addition, it may further comprise an end plate coupled to both ends of the tube and the flow path cap coupled to the outside of the end plate to switch the flow path of the heating water flowing through the inside of the tube.

In addition, the outer side of the tube may be configured to be coupled to the heating fins.

According to the heat exchanger for a gas boiler according to the present invention, the heat exchange tube is inclined with respect to the direction in which the exhaust gas is introduced to increase the exhaust resistance, thereby improving heat exchange efficiency.

In addition, according to the present invention, by installing a flow path cap on the outside of the end plate to which the tube is coupled to switch the flow path of the heating water flowing inside the tube, the flow path of the heating water in which heat exchange is performed between the heating water and the exhaust gas in the limited heat exchanger interior space. It is effective to form as long as possible.

In addition, according to the present invention, by inducing the turbulent flow of the exhaust gas passing through the tube by coupling the heat transfer fins to the outside of the tube disposed inclined, there is an effect that can further improve the heat exchange efficiency.

1 is an exploded perspective view showing a heat exchanger for a conventional gas boiler,
2 is a plan sectional view in a state in which the heat exchanger shown in FIG. 1 is coupled;
3 is a view showing an exhaust gas passing between tubes in a heat exchanger for a conventional gas boiler,
4 is an exploded perspective view showing a heat exchanger for a gas boiler according to the present invention;
5 is a plan sectional view in a state in which the heat exchanger shown in FIG. 4 is coupled;
6a to 6d are exemplary views showing a state in which a tube is disposed in the heat exchanger for a gas boiler according to the present invention;
7 is a view for explaining a contact state between the tube and the exhaust gas in the heat exchanger for a gas boiler according to the present invention.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is an exploded perspective view showing a heat exchanger for a gas boiler according to the present invention, Figure 5 is a plan sectional view in a state in which the heat exchanger shown in FIG.

In the gas boiler heat exchanger 100 according to the present invention, in installing a heat exchange tube 110 having a rectangular cross section inside a heat exchanger, the exhaust resistance between the tube 110 and the exhaust gas is increased to improve heat exchange efficiency. As a configuration for making the tube 110 is characterized in that the inclined arrangement with respect to the direction in which the exhaust gas flows.

Referring to FIG. 4, a plurality of heat transfer fins 120 are disposed side by side at a predetermined interval in the front-rear direction on the outside of the plurality of tubes 110 having a rectangular cross-section arranged inclined as described above. The heating fin 120 has a plurality of insertion holes (120a) corresponding to the inclined shape of the tube 110 is formed so that the tube 110 is inserted into the insertion hole (120a), the tube 110 The portion where the outer surface of the contact hole and the insertion hole (120a) is welded.

End plates 130 and 150 are joined to both ends of the tube 110 to which the heat transfer fins 120 are coupled. The end plates 130 and 150 have a plurality of insertion holes 130a and 150a corresponding to the shape of the tube 110 so that both ends of the tube 110 are inserted into the insertion holes 130a and 150a. Welded behind.

The front side of the end plate 130 is coupled to the flow path cap (140; 141, 142, 143) for switching the flow path of the heating water flowing inside the tube 110, the flow path cap 160 on the rear side of the end plate 150; 161,162 are combined. In addition, the inlet 141b and the outlet 143b of the heating water are formed in the flow path caps 141 and 143, respectively.

Referring to FIG. 5, the heating water flows into the inner space 141a of the flow path cap 141 through the heating water inlet 141b and moves to the rear side as shown by the arrows through the tubes 111a, 111b and 111c. The flow path is switched in the inner space 161a of the rear flow path cap 161 and moved forward through the tubes 112a, 112b and 112c.

In addition, the heating water introduced into the inner space 142a of the front side flow cap 142 is converted to the flow path and moved to the rear side through the tubes 113a, 113b, and 113c, and the inside of the flow path cap 162 on the rear side. The heating water introduced into the space 162a is converted to the flow path again and moved to the front side through the tubes 114a, 114b, and 114c, and is collected in the interior space 143a of the front flow path cap 143, and then the heating water. It flows out through the outlet 143b.

By the inner space (141a, 142a, 143a) formed by the front end plate 130 and the flow path cap (140; 141, 142, 143), and the rear end plate 150 and the flow path cap (160; 161, 162) The formed inner spaces 161a and 162a are formed to the lower ends of the end plates 130 and 150 and the flow path caps 140 and 160, and the end plates 130 and 150 and the flow path caps 140 and 160 are overheated by a row of burners (not shown). Prevent it.

Hereinafter, with reference to the accompanying drawings will be described the heat transfer action between the tube 110 disposed inclined and the exhaust gas passing therebetween.

Figure 6a to 6d is an exemplary view showing the arrangement of the tube in the gas boiler heat exchanger according to the present invention, Figure 7 is a view for explaining the contact state between the tube and the exhaust gas in the heat exchanger for the gas boiler according to the present invention. to be.

In the above, as shown in FIG. 6A, the number of the tubes 110 is 12, and the six arranged on the left side are inclined to the right side, and the six arranged on the right side are inclined to the left side. Although described as an example, the number and arrangement of the tube 110 in the present invention is not limited to this, as shown in Figure 6b to 6d inclined to the left or right relative to the inflow direction of the exhaust gas. If arranged, it may be modified in other forms.

6A and 6B, however, when the tubes 110 disposed on both sides of the left and right sides are arranged in a symmetrical form with respect to the tubes disposed at the center as shown in FIGS. 6A and 6B, FIGS. It will be more advantageous to induce turbulent flow as compared to the case in which only one direction is inclined as in the embodiment shown.

Referring to FIG. 7, in the present invention, the tube 110 is installed to be inclined at a predetermined angle θ with respect to the inflow direction of the exhaust gas, and the inclined angle θ takes into account flow interference and exhaust resistance of the exhaust gas. It is preferable to set to have an angle range between 20 ° ~ 79 °. When configured in such an inclination range, it is possible to avoid excessive interference of the flow of the exhaust gas between the tubes 110, and the exhaust gas starts to contact at the lower end 110a of the tube 110 so that the side surface 110b. When flows in contact with the a), the exhaust resistance with the exhaust gas is increased, thereby improving heat transfer efficiency.

By arranging the tubes 110 inclined as described above, a contact area having a predetermined exhaust resistance between the exhaust gas rising in the heated state and the tube 110 is increased so that the tube 110 is arranged in parallel with the inflow direction of the exhaust gas. In comparison with the case, the heat of combustion of the exhaust gas can be transmitted to the heating water flowing along the inside of the tube 110 as much as possible.

As described above, in the present invention, the tube 110 is inclined to increase the exhaust resistance at the contact surface between the tube 110 and the exhaust gas, thereby improving heat transfer efficiency, and coupling the heat transfer fins 120 to the outside of the tube 110. Therefore, it is not necessary to provide a separate device such as a turbulence in order to form the turbulent flow of the exhaust gas, and fix both ends of the tube 110 to the end plates (130,150) and install flow path caps (140,160) on the outside thereof. By forming the flow path of the heating water in contact with the exhaust gas as long as possible can further improve the heat transfer efficiency.

1,100: Heat Exchanger
10,110: Tube
20,40: Tube connection member
30,50: Case
120: heating fin
130,150: End plate
140,160: Eurocap

Claims (5)

In a heat exchanger in which a plurality of tubes having a rectangular cross section are installed adjacent to each other and heat exchange is performed while exhaust gas passes through a passage between the tubes,
The tube is a heat exchanger for a gas boiler, characterized in that arranged inclined based on the direction in which the exhaust gas flows.
The method of claim 1,
The inclination angle of the tube is a heat exchanger for a gas boiler, characterized in that in the range of 20 ° ~ 79 °.
The method of claim 2,
The tube is a heat exchanger for a gas boiler, characterized in that the arrangement of the tubes arranged on both sides inclined in a symmetrical form with respect to each other based on the tube disposed in the center.
The method according to any one of claims 1 to 3,
And a flow path cap coupled to both ends of the tube and connected to both ends of the tube, and a flow path cap coupled to an outer side of the end plate to switch a flow path of the heating water flowing through the inside of the tube.
The method of claim 4, wherein
Heat exchanger for a gas boiler, characterized in that the heat transfer fin is coupled to the outside of the tube.

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