KR101370415B1 - Slant disposition type heat exchange device and convection oven with the same - Google Patents

Abstract

A slant disposition type heat exchanger and a convection oven having the same are disclosed. The heat exchanger (20) includes a combustion chamber (21) configured to accommodate a burner combusting mixed gas therein and having a cylindrical shape; and a heat exchange part (22) connected to communicate with an output end of the combustion chamber (21), having a cross-sectional structure (ES) of an oval shape in a width direction along the length thereof, and including a plurality of heat dissipation pipes (23) having a portion with an upper and lower dual array section (DL), and an exhaust pipe (24) connected to communicate with the heat dissipation pipes (23). In the upper and lower dual array section (DL) of the heat dissipation pipes (23), the plurality of heat dissipation pipes (23) positioned in the upper array section is disposed for a plurality of heat dissipation pipes (23) positioned in the lower array section to be sloped at a predetermined angle (θ) so as to delay the discharge speed of the flow of ambient air when the ambient air flows from the bottom of the vertical dual array section to the top thereof. Thus, heat exchange efficiency can be significantly improved by increasing a contact area between the heat exchanger and ambient air. [Reference numerals] (AA) Air flow

Description

Slant heat exchanger and convection oven with same {SLANT DISPOSITION TYPE HEAT EXCHANGE DEVICE AND CONVECTION OVEN WITH THE SAME}

The present invention relates to an inclined array heat exchanger and a convection oven having the same, and more particularly, has an elliptical cross-sectional structure, and has an upper and lower dual array section on a portion of the array path and an upper array section. By providing a heat exchanger comprising a plurality of heat dissipation pipes inclined at a predetermined angle with respect to the inclined, heat exchange efficiency through the plurality of heat dissipation pipes having the structure as described above can increase the heat exchange efficiency significantly and also increase the durability of the heat dissipation pipes And a convection oven having the same.

In general, a heat exchanger refers to a device that sends thermal energy of a high temperature fluid to a low temperature fluid, and is used in a heater, a cooler, an evaporator, and the like. As a fluid, a gas or a liquid is used, and a solid and a fluid may be used together. Heat exchange methods include a diaphragm with a diaphragm between the two fluids, a heat storage type (regenerated type) that transfers heat by installing a heat accumulator, and a direct contact type in which the two fluids are in direct contact with each other to perform heat transfer.

The diaphragm type is used in cases where the mixing of fluids should be avoided, such as in the chemical industry or the food industry, or in boilers that burn with combustion gas, because the two fluids are completely separated. Pipes are popular. In addition, fins may be provided on one side or both sides of the metal tube, and a wave plate may be used as a diaphragm in many cases. The diaphragm type has a limited heat transfer amount per unit area and has a large structure compared to the heat transfer amount.

The most common type of heat storage type is a method of exchanging heat by alternately passing a rotating heat accumulator with a porous material or a wavy metal plate into two fluids. The heat transfer is large compared to the size of the device, but the drawback is that the two fluids are mixed. Direct contact is the most effective heat exchanger but is only used between separable fluids such as gas and liquid because the two fluids are mixed. In recent years, a convection (convection) heat exchanger applied to a gas or an electric oven is used.

1 is a schematic perspective view showing a convection oven with a heat exchanger according to the prior art.

As shown in FIG. 1, the convection oven 1 according to the prior art is provided with a main body 3 having an appearance and having a cooking chamber 2 therein, and a front side of the main body 3. A door 4 for opening and closing the opened front part of the cooking chamber 2, an operation part 5 provided on one side of the main body part 3 to adjust the temperature of the cooking chamber 2, and the main body part 3. Heat exchanger (6) installed in the heating chamber and delivering hot air obtained through heat exchange between the combustion gas of high temperature and ambient air generated by burning a mixed gas of fuel gas and air supplied from the outside into the cooking chamber (2), and It is configured to include a cooking chamber (2) and a washing unit (not shown) for washing the heat exchanger (6).

Looking at the convection heat exchanger 6 of the prior art in more detail, when the conventional heat exchanger 6 provides a flame at one end of the combustion chamber (7), the combustion gas passes through the heat exchange unit (8) exhaust chamber It is discharged through the exhaust port 9a of (9), and in this discharge process, the heat exchange of the convection system is made to the surroundings from the heat exchange part 8.

However, the heat exchanger 6 of the related art exchanges flame with the combustion chamber 7 of the heat exchanger 6 by injecting a flame from the center or the side of the combustion box 7 in the form of a rectangular box using a burner (not shown). When the heat dissipation pipe 8a of the part 8 is heated, it has the structure which heat-exchanges by forcibly convection high temperature air into the cooking chamber 2 with the convection fan 10. FIG. In addition, a plurality of heat dissipation pipes 8a of the conventional heat exchanger 6 have a shape having a circular cross-sectional structure.

Therefore, the blind box combustion chamber 7 has a dead zone where heat exchange with the surrounding air is difficult to occur, and local overheating occurs at such a portion, which adversely affects the durability of the heat exchanger 6. In addition, as shown in Figure 1, the structure of the plurality of heat dissipation pipe (8a) having a circular cross-sectional structure as described above has a circular cross-sectional shape does not stagnate the flow of ambient air, the ambient air is the plurality of heat radiation There is a problem that the heat exchange efficiency is greatly reduced by quickly flowing from the top to the bottom through the play of the pipe (8a).

Accordingly, the present invention has been made to solve the problems described above, an object of the present invention is to have a cylindrical combustion chamber, an elliptic cross-sectional structure and a multi-tubular structure, the upper and lower double arrangement in a portion on the array path An improved heat exchanger including a plurality of heat dissipation pipes having a section and arranged at an angle with respect to the lower arranging section at an angle, thereby increasing heat exchange efficiency of the heat exchanger and providing durability of the heat dissipating pipe. It is to provide a gradient heat exchanger and a convection oven having the same to improve the efficiency, and to increase the overall thermal efficiency to obtain a good cooking result with a high calorie.

In order to achieve the above object, the present invention according to the first embodiment of the present invention includes a combustion chamber accommodating a burner for burning a mixed gas of fuel gas and air supplied from the outside into a cylindrical shape; And

It is connected in communication with the output end of the combustion chamber and has an elliptical cross-sectional structure (ES) in the width direction along the length, it is made of a multi-tubular shape arranged with a predetermined gap between each other and the upper and lower dual array section (DL) on a portion of the array path And a plurality of heat dissipation pipes having a plurality of heat dissipation pipes, and an exhaust pipe connected to the plurality of heat dissipation pipes, and surrounding the high-temperature combustion gas generated during the combustion of the mixed gas in the combustion chamber through the plurality of heat dissipation pipes. And a heat exchanger configured to exchange heat with air and discharge combustion gas lowered to a low temperature through the heat exchange to the outside through the exhaust pipe.

In the upper and lower dual array section (DL) of the plurality of heat dissipation pipes, a plurality of heat dissipation pipes located in the upper array section so that the discharge rate of the ambient air flow is delayed when the ambient air flows from the lower portion to the upper portion of the upper and lower dual array section Is inclined at an inclination angle θ for a plurality of heat dissipation pipes located in the lower array section,
The inclination angle θ of the plurality of heat dissipation pipes on the side of the upper side of the array section with respect to the plurality of heat dissipation pipes on the side of the lower side arrangement section is 10 to 40 °,
Further, in one embodiment, the heat exchange part is of the form of a tube for receiving and discharging the combustion gas flowing from the combustion chamber is provided between the output end of the combustion chamber and the corresponding portion of the plurality of heat dissipation pipes and a large empty space in the center portion And a first connector having a shape and a tube shape capable of receiving and discharging the combustion gases flowing from the plurality of heat dissipation pipes, and are provided between the plurality of heat dissipation pipes and the exhaust pipe and have a large empty space in the center. It further comprises a second connecting body.
Further, in one embodiment, the combustion chamber is disposed inside the long combustion chamber main part having a burner and a cylindrical shape, and integrally connected to the input end of the combustion chamber main part and have a cylindrical shape, and are inclinedly connected to the input end of the combustion chamber main part. It is characterized by consisting of a combustion chamber introduction.

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In addition, in one embodiment, the heat exchange unit is in the form of a tube that can receive and discharge the combustion gas flowing from the combustion chamber having a vertical double array section (DL) between the first connector and the second connector. And a third connector provided at inner ends of the plurality of heat dissipation pipes and having a wide empty space at a central portion thereof, the third connecting body securely communicating the inner ends of the plurality of heat dissipation pipes in the double array section DL. It is characterized by.

In an embodiment, the inclined array heat exchanger may further include at least one connection bar for fixing the third connection body of the heat exchange unit and the combustion chamber introduction part of the combustion chamber to each other.

On the other hand, the present invention according to the second embodiment of the present invention forms an appearance and has a cooking compartment therein;

A door provided at the front side of the main body to open and close the opened front part of the cooking chamber;

An operation unit provided on one side of the main body to adjust a temperature of a cooking chamber; And

The heat generated by burning the mixed gas of fuel gas and air supplied from the outside through a burner provided in the main body and controlled by the operation unit and heat exchanged with the ambient air, It provides a convection oven comprising a; inclined array heat exchanger according to any one of the embodiments of the first embodiment for transferring the hot air into the cooking chamber.

The present invention includes a heat exchanger including a plurality of heat dissipation pipes connected in communication with a cylindrical combustion chamber and having an elliptical cross-sectional structure in the width direction along a length thereof, thereby increasing heat exchange efficiency between the heat exchanger and the surrounding air. It can be greatly increased.

In addition, the present invention is provided with a heat exchanger including a connection provided between the combustion chamber and the plurality of heat dissipation pipes, a part of the plurality of heat dissipation pipes, or between the plurality of heat dissipation pipes and the exhaust pipes, and thus the heat exchanger through which the hot combustion gas passes. By increasing the heat exchange time between the air and the surrounding air can significantly increase the heat exchange efficiency.

In addition, the present invention through the heat exchanger of the improved structure, while exhibiting the excellent technical effects as described above, easy to handle and / or installation, and has a compact structure can be configured to compactly configure the convection oven to which the heat exchanger is applied.

1 is a schematic perspective view showing a convection oven with a heat exchanger according to the prior art;
Figure 2 is a schematic partial cross-sectional perspective view showing a gradient array heat exchanger according to a first embodiment of the present invention.
3 is a schematic perspective view showing a convection oven according to a second embodiment to which a heat exchanger according to a first embodiment of the present invention is applied.

Hereinafter, a convection oven including the gradient heat exchanger according to the first embodiment of the present invention and the heat exchanger according to the second embodiment will be described with reference to FIGS. 2 and 3. In the description of this embodiment, the same reference numerals are used for the same components as those in the prior art for the sake of understanding.

As shown in FIG. 2, the inclined array heat exchanger 20 according to the first embodiment of the present invention accommodates a burner (not shown) that combusts a mixed gas of fuel gas and air supplied from the outside. Combustion chamber 21 provided in a cylindrical form; And a heat exchange part 22 connected in communication with the combustion chamber 21. The cylindrical combustion chamber 21 enables the installation of a large burner to obtain a good cooking result with a high calorific value, and also induces a smooth flow of combustion gas from the combustion chamber 21 to the heat exchanger 22. do.

The heat exchange part 22 is connected to the output end of the combustion chamber 21 and has an elliptical cross-sectional structure (ES) in the width direction along the length, made of a multi-tubular shape and arranged with a predetermined clearance between each other And a plurality of heat dissipation pipes 23 having upper and lower dual array sections DL in a portion on the path, and an exhaust pipe 24 connected in communication with the plurality of heat dissipation pipes 23. In addition, the heat exchanger 22 heat exchanges the high temperature combustion gas generated in the combustion process of the mixed gas in the combustion chamber 21 with the ambient air through the plurality of heat dissipation pipes 23 and lowers to a low temperature through the heat exchange. Combustion gas is discharged to the outside through the exhaust pipe 24.

In addition, in the upper and lower dual array section (DL) of the plurality of heat dissipation pipes 23, located in the upper array section so that the discharge speed of the surrounding air flow is delayed when the ambient air flows from the lower portion to the upper portion of the upper and lower dual array section. The plurality of heat dissipation pipes 23 are disposed to be inclined at a predetermined angle θ with respect to the plurality of heat dissipation pipes 23 positioned in the lower arrangement section. The inclination angle θ is the two short arcs of the elliptical cross section of the heat dissipation pipe 23 on the lower side array section, the first virtual line passing through the center thereof, and the elliptical cross section of the heat dissipation pipe 23 on the upper side array section side. The angle between the short arc and the second imaginary line passing through its center is shown (see FIG. 2). In addition, the heat exchange part 22 guides the combustion gas generated from the combustion chamber 21 to the exhaust pipe 24 through the plurality of heat dissipation pipes 23 extending continuously in a single direction and with the surrounding air. Increase heat exchange time.

In an embodiment, the inclination angle θ of the plurality of heat dissipation pipes 23 on the upper side of the array section with respect to the plurality of heat dissipation pipes 23 on the lower side of the array section is preferably 10 to 40 °. The reason is that when the inclination angle θ is less than 10 °, the discharge speed of hot air is too fast, and when the inclination angle θ exceeds 40 °, the speed of hot air is too slow and the heat exchange efficiency is greatly reduced.

In one embodiment, the combustion chamber 21 is a long combustion chamber main portion 21a having a burner (not shown) therein and having a cylindrical shape, and integrally connected to an input terminal of the combustion chamber main portion 21a and having a cylindrical shape. It may be configured as a combustion chamber introduction portion 21b which is inclinedly connected to the input end of the combustion chamber main portion 21a. Such a combustion chamber structure may allow the combustion chamber main portion 21a to have a predetermined clearance from a relative structure of a corresponding product on which the combustion chamber 21 is mounted, thereby increasing heat exchange efficiency between the combustion chamber main portion 21a and the surrounding air. .

In addition, in one embodiment, the heat exchanger 22 may be provided in a form further including a fixture 25 to maintain a constant gap between the plurality of heat dissipation pipes 23. In addition, the heat exchange part 22 may include a bent part 23a at at least two positions of the plurality of heat dissipation pipes 23. The bent structure of the heat exchanger 22 contributes to making the heat exchanger 20 compact.

In another embodiment, the heat exchange part 22 is in the form of a tube capable of receiving and discharging the combustion gas introduced from the combustion chamber 21, and the output end of the combustion chamber 21 and the plurality of heat dissipation pipes 23. The first connector 26 having a large void space in the center portion between the corresponding portions and a tube type for receiving and discharging the combustion gas flowing from the plurality of heat dissipation pipes 23. The heat dissipation pipe 23 and the exhaust pipe 24 may be provided in a form further including a second connecting body 27 having a large empty space in the center portion.

In addition to the heat exchange structure as described above, the heat exchange unit 22 is a tube type that can receive and discharge the combustion gas flowing from the combustion chamber 21, the first connecting member 26 and the second connecting member ( 27) is provided in the inner end of the plurality of heat dissipation pipes 23 arranged in a form having a vertical double array section DL therebetween and has a large empty space in the center portion, It may be provided in a form further comprising a third connecting body 28 for fixing the inner end of the heat dissipation pipe 23 in communication. The first, second, and third connectors 26, 27, and 28 have a large void space therein to retard the flow of the combustion gases to increase the heat exchange time between the heat exchanger 22 and the surrounding air. As a result, it is possible to increase the heat exchange efficiency of the heat exchange unit 22 as a result. In addition, the third connection body 28 of the heat exchange part 22 and the combustion chamber introduction part 21b of the combustion chamber 21 may be fixed by at least one connection bar 29. The connection bar 29 strengthens the unified structure of the combustion chamber 21 and the heat exchanger 22. Adjacent portions are welded to the combustion chamber 21, the first, second and third connectors 26, 27, 28, the plurality of heat dissipation pipes 23, and the exhaust pipe 24 to increase airtightness. It is preferred to be fixed and integrated in a manner.

On the other hand, as shown in Figure 3, the convection oven (1A) according to a second embodiment of the present invention includes a main body portion (3) forming an appearance and having a cooking chamber (2) therein; A door (4) provided at the front side of the main body part (3) to open and close the opened front part of the cooking chamber (2); An operation unit 5 provided on one side of the main body 3 to adjust a temperature of the cooking chamber 2; And heat generated by burning a mixed gas of fuel gas and air supplied from the outside through a burner (not shown) installed in the main body 3 and controlled by the operation unit 5. It may be provided in the form of a; including the inclined array heat exchanger 20 described in any one of the embodiments of the first embodiment for exchanging heat with air and the high temperature hot air obtained through such heat exchange into the cooking chamber (2). have. In addition, the convection oven 1A may further include a washing unit (not shown) for washing the cooking chamber 2 and the heat exchanger 20 on one side of the main body 3.

A preferable operation of the convection oven according to the second embodiment to which the gradient heat exchanger according to the first embodiment of the present invention as described above is applied will be described with reference to FIGS. 2 and 3.

First, when cooking operation is started through the operation unit 5 in a state in which food for cooking is placed in the cooking chamber 2, a mixed gas of fuel gas and air supplied from the outside is supplied to the combustion chamber 21 of the heat exchanger 20. ) Is burned through a burner (not shown) in the combustion chamber 21 to guide the heat exchanger 22 of the heat exchanger 20 from the combustion chamber 21 of the heat exchanger 20.

Subsequently, the high temperature combustion gas flowing into the heat exchange part 22 from the combustion chamber 21 passes through a plurality of heat dissipation pipes 23 having an elliptic cross-sectional structure ES in the width direction along a length thereof at a low temperature. After lowering, it is discharged to the atmosphere through the exhaust pipe 24. At this time, the plurality of heat dissipation pipe 23 has an elliptical cross-sectional structure (ES) in the width direction along the length as described above and in the upper and lower double arrangement section (DL) of the plurality of heat dissipation pipes 23, Since the plurality of heat dissipation pipes 23 disposed in the array section are inclined at a predetermined angle θ with respect to the plurality of heat dissipation pipes 23 disposed in the lower array section, there is a gap between the plurality of heat dissipation pipes 23. When the air flow passing through the upper and lower dual arrangement section flows from the upper portion to the upper portion is delayed by the discharge rate of the air flow is in contact with the outer surface of the plurality of heat dissipation pipe 23 can be increased heat exchange efficiency. In addition, the hot hot air heated through the heat exchange process is supplied into the cooking chamber 2 so that food in the cooking chamber 2 can be cooked.

In addition, in the heat exchange process as described above, the first, second and third connectors 26, 27, 28 of the heat exchange part 22 increase the residence time of the combustion gas passing through the plurality of heat dissipation pipes 23. As a result, the heat exchange efficiency can be further increased. Thereafter, after stopping the cooking operation through the operation unit 5, the door 4 is opened to take out the cooked food, and a washing unit (not shown) is operated for clean or later new cooking. 2) and the heat exchanger 20 may be washed.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and simple substitution, modification and alteration within the technical spirit of the present invention will be apparent to those skilled in the art.

1A: Convection Oven 20: Heat Exchanger
21: combustion chamber 21a: combustion chamber main part
21b: combustion chamber inlet 22: heat exchanger
23: heat dissipation pipe 23a: bend
24: exhaust pipe 25: fixer
26: first connector 27: second connector
28: third connector 29: connecting bar
ES: elliptical cross-section structure DL: double array section
θ: angle

Claims (7)

A combustion chamber 21 accommodating a burner for burning a mixed gas of fuel gas and air supplied from the outside and provided in a cylindrical shape;
It is connected in communication with the output end of the combustion chamber 21 and has an elliptical cross-sectional structure (ES) in the width direction along the length, made of a multi-tubular shape arranged with a predetermined gap between each other and arranged up and down in a portion on the array path And a plurality of heat dissipation pipes 23 having a section DL, and an exhaust pipe 24 connected in communication with the plurality of heat dissipation pipes 23, in the combustion process of the mixed gas in the combustion chamber 21. A heat exchange part 22 for exchanging the generated high temperature combustion gas with ambient air through the plurality of heat dissipation pipes 23 and discharging the combustion gas lowered to a low temperature through the heat exchange to the outside through the exhaust pipe 24; Including,
In the upper and lower dual array section (DL) of the plurality of heat dissipation pipes 23, a plurality of located in the upper array section so that the discharge speed of the surrounding air flow is delayed when the ambient air flows from the lower portion to the upper portion of the upper and lower double array section Heat dissipation pipes 23 are disposed to be inclined at an inclination angle θ with respect to the plurality of heat dissipation pipes 23 positioned in the lower arrangement section,
The inclination angle θ of the plurality of heat dissipation pipes 23 on the upper side of the array section with respect to the plurality of heat dissipation pipes 23 on the lower side of the array section is 10 to 40 °,
The heat exchange part 22 is in the form of a tube capable of receiving and discharging the combustion gas flowing from the combustion chamber 21, and is provided between the output end of the combustion chamber 21 and corresponding portions of the plurality of heat dissipation pipes 23. And a plurality of heat dissipation pipes 23 in the form of tubes capable of receiving and discharging the combustion gas flowing from the plurality of heat dissipation pipes 23 and the first connecting body 26 having a large empty space in the center portion. And a second connecting body (27) provided between the exhaust pipe (24) and having a large empty space in a central portion thereof. delete The method of claim 1,
The combustion chamber 21 is connected to an input terminal of the long combustion chamber main portion 21a having the burner disposed inside and having a cylindrical shape, the combustion chamber main portion 21a, and having a cylindrical shape, and the combustion chamber main portion ( An inclined array heat exchanger composed of a combustion chamber inlet (21b) connected obliquely to an input end of (21a). delete The method of claim 1,
The heat exchange part 22 is in the form of a tube capable of receiving and discharging the combustion gas flowing from the combustion chamber 21, and the upper and lower double arrays are disposed between the first connecting body 26 and the second connecting body 27. It is provided on the inner end of the plurality of heat dissipation pipes 23 arranged in a shape having a section DL and has a wide empty space in the center portion, and the inner ends of the plurality of heat dissipation pipes 23 in the double-array section DL. An inclined array heat exchanger further comprising a third connecting body (28) to secure the portion in communication. The method of claim 5, wherein
And a third connecting body (28) of the heat exchange part (22) and at least one connecting bar (29) for mutually fixing the combustion chamber introduction part (21b) of the combustion chamber (21). A main body part 3 forming an appearance and having a cooking chamber 2 therein;
A door (4) provided at the front side of the main body part (3) to open and close the opened front part of the cooking chamber (2);
An operation unit 5 provided on one side of the main body 3 to adjust a temperature of the cooking chamber 2; And
The heat generated by burning a mixed gas of fuel gas and air supplied from the outside through a burner provided in the main body 3 and controlled by the operation unit 5 is heat-exchanged with the surrounding air. Convection comprising; the inclined array heat exchanger (20) according to any one of claims 1 and 3, and 5 and 6 for transmitting high temperature hot air obtained through heat exchange into the cooking chamber (2). Oven.

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