High-calorie Chinese microwave oven

Abstract

This Chinese range provides efficient secondary air supply to the internal flame burner, enabling high-power burner output. [Solution] The Chinese range 1 has a trivet 31 on which a wok 10 is placed, and a pot frame 3 having a cylindrical frame side plate 33 extending downward from the same, and an internal flame burner 5 located in the lower center of the pot frame. The system is equipped with the following: Secondary air inlets 33f and 33h are formed in the frame side plate 33 above the burner 5, penetrating the frame side plate 33, and a ventilation box 4 is attached to the outside of the frame side plate 33 where the inlets are located. Inside the ventilation box 4, a negative pressure is created due to the draft effect, and air is forcefully drawn in from the opening 4p at the lower end, and secondary air is forcefully blown in from the secondary air inlets 33f and 33h towards the upper center of the burner 5.

Description

Technical Field

[0001] The present invention relates to a Chinese range used in Chinese restaurants and the like. In particular, the present invention relates to a heating and cooking appliance such as a Chinese range that can achieve high-calorie gas combustion without generating CO, even in a small-sized outer tube type Chinese range equipped with an internal flame port burner.

Background Art

[0002] In many Chinese business formats, an outer tube type Chinese range is popular for stir-frying cooking such as fried rice and stir-fried vegetables, where the ingredients are quickly passed over fire. As a selection point for an outer tube type Chinese range, a performance that can cook stir-fried dishes at a high temperature and in a shorter time is required. By cooking the ingredients at a higher temperature and in a shorter time, a delicious dish that retains the original texture of the ingredients can be provided. Furthermore, since it also leads to an improvement in the turnover rate of dish provision, many Chinese chefs are demanding strong firepower.

[0003] As burners used in Chinese ranges, a Chinese burner that burns in a Bunsen style and an internal flame port burner are mainly used. A Chinese burner has a plurality of flame ports in the vertical direction on the inner and outer rings of the burner head, and a plurality of flames are generated from the flame ports, and has the characteristic of heating the entire bottom of a Chinese pot over a wide range. Therefore, it is a burner suitable not only for stir-frying cooking but also for stewing cooking.

[0004] On the other hand, an internal flame port burner is a burner in which a net that bears the flame port is formed in a ring shape inside the inner and outer rings of the burner head, and flames are generated from the exposed part of the net. Since the flame of the internal flame port burner rises upward from the inward direction of the inner and outer rings, it hits intensively near the center, that is, the bottom of the Chinese pot arranged above the burner, and the entire bottom of the pot is heated. Therefore, while the bottom of the pot is heated intensively and the flame spreads around the pot, in stir-frying cooking such as stir-fried vegetables and char siu rice, quick heating and cooking can be performed during the pot shaking process (when the ingredients tend to always gather at the bottom of the pot). In particular, stir-fried dishes such as stir-fried vegetables and fried rice are said to bring out the natural flavor of the ingredients when cooked quickly, and many Chinese chefs seek out high-heat internal flame burners.

[0005] An example of a Chinese-style range with an internal flame burner is disclosed in Patent Document 1 (JP 2001-272008). Figure 4 is a diagram included in the abstract of Patent Document 1 (the reference numerals have been changed). The problem to be solved by the invention described in Patent Document 1 is to "provide a gas range 370 in which the central part of the pot 360 is heated with high heat throughout, CO generation near the outer circumference of the internal flame burner 340 is reduced, and combustion noise is not produced." According to the abstract of Patent Document 1, the following configuration is provided as a solution to this problem. Specifically, the internal flame port burner 340 does not have a vent in the center of the burner, so that secondary air does not flow from the center of the burner to the inner circumference of the flame, and its flame port 343 is truncated cone-shaped. The rectifier plate 371c is flat or slopes diagonally downward from the inner edge of the rectifier plate toward the outer edge of the rectifier plate. The outer edge of the rectifier plate 371c is located at the lower edge of the skirt portion 371a, inside the skirt portion, or below the skirt portion space 371b formed by the skirt portion. The trivet 371 is located spaced apart from the internal flame port burner 340, and the inner edge of the rectifier plate 371a is located above the peripheral edge of the upper surface of the burner. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2001-272008 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0007] Figure 5 schematically shows the configuration of a commercially available Chinese range 401 and the flow of primary and secondary air supplied to the burner 405. In the figure, the reference numerals for the main parts of the range are the same as those in the figures of embodiments of the present invention such as Figure 1, plus 400, and are as follows: 402; main body, 403; pot frame, 405; internal flame port burner, 406; gas / primary air supply unit, 407; gas supply system, 408; back plate, 409; legs, 433; frame side plate. Primary air is drawn into the gas / primary air supply pipes 461 and 463 by the air-draw-in effect from between the outer circumference of the tapered pipe 477 at the end of the gas supply system 407 and the trumpet-shaped pipe section 446 outside of it. In this example, the gas supply system 407 is an external pipe type, located outside the range body 402, and consists of a gas pipe 471, a gas cock 473, and an internal pipe 475. The trumpet-shaped pipe section 446 is attached to the main end of the gas / primary air supply pipes 461 and 463.

[0008] Secondary air is drawn into the main body 402 through secondary air intake ports 425j formed on the upper part of the left and right side plates 425 of the main body 402, and secondary air intake ports 426j formed on the lower part of the rear plate 426 of the main body 402. As shown in Figure 5(B), the air that enters through the secondary air intake ports 425j on the left and right side plates 425 of the main body wraps around under the lower edge 433z of the boiler frame side plate 433, passes between the frame side plate 433 and the outer edge of the burner 405, and is supplied to the flame on the burner 405. As shown in Figure 5(B), the air drawn into the main body through the secondary air intake port 426j on the rear plate 426 of the main body rises diagonally upward, passes between the frame side plate 433 and the outer edge of the burner 405, and is supplied to the flame on the burner 405. Furthermore, some of the air entering through the two ports 425j and 426j described above is directed upwards from below the burner 405 and sent to the burner flame.

[0009] The Chinese range 401 shown in Figure 5 above is excellent and widely used. However, as will be discussed below, further improvements are needed. In other words, the current internal flame burner type Chinese range 1 uses a combustion method that concentrates the flame on the bottom of the wok, making it difficult for secondary air to reach the inner flame, thus limiting the amount of secondary air that can be supplied and the heat output. For a standard Chinese range, specifically one with an inner diameter of approximately 310 mm for the pot frame and trivet, an opening of approximately 550 mm, and a wok diameter of approximately 360-420 mm, the maximum burner output that can be generated under stable combustion conditions within the combustion space of such a Chinese range was limited to approximately 18,000 kcal / h. The reason for this is that increasing the output beyond this point would increase the amount of carbon monoxide produced, raising safety concerns.

[0010] The present invention aims to improve combustion efficiency and increase burner output by establishing a structure in the development of Chinese ranges in which secondary air is efficiently supplied by the flame of the internal flame port burner, thereby increasing the air-fuel consumption required for combustion. [Means for solving the problem]

[0011] In these "Means for Solving the Problem" and "Claims," ​​the reference numerals for each part of the attached diagram are indicated in parentheses, but this is for reference purposes only and is not intended to limit the scope of the rights to those shown in the attached diagram.

[0012] The first Chinese range (1) of the present invention comprises a pot frame (3) having a trivet (31) on which a wok (10) is placed, and a cylindrical frame side plate (33) extending downward from the trivet; an internal flame burner (5) positioned in the lower center of the pot frame; and a main body (2) on which the pot frame (3) is mounted and which houses the burner (5). A secondary air inlet (33f·33h) is formed in the frame side plate (33) above the upper surface (5t) of the burner (5), and a ventilation box (4) having a closed upper end (4b), a closed side end (4j), and an open lower end (4p) is attached to the outside of the frame side plate (33) where the secondary air inlet (33f·33h) is located.

[0013] In the first Chinese range (1) described above, it is preferable that a secondary air intake (26b) is provided on the bottom edge plate (26) of the main body (2) which is located below the ventilation box (4) and along the bottom (25k) of the side plate (25). Furthermore, it is preferable that the secondary air inlets (33f·33h) are provided on the frame side plate (33) between the upper surface (5t) of the burner (5) and the lower part (31x) of the trivet (31).

[0014] Solution (a): "Installation of secondary air inlet holes (33f, 33h) in the boiler frame wall (frame side plate (33))" To increase the output of the internal flame burner within the combustion space of the range, it is necessary to allow more secondary air to flow around the flame and improve the air-fuel ratio required for combustion. Therefore, a specification has been established in which multiple secondary air inlets (33f, 33h) are provided in the kettle frame wall (frame side plate (33)), allowing secondary air to flow efficiently around the flame through these holes and improving combustion efficiency. In the embodiment described later, the secondary air inlet holes (33f, 33h) are structurally provided in the front and left and right sides of the kettle frame wall, and the holes are arranged in two rows, upper and lower (dimension examples will be described later). The secondary air inlet holes may also be slit-shaped. The area of ​​the secondary air inlet holes is preferably 100 to 200 square centimeters in total (30 to 70 square centimeters in each direction) (152 square centimeters in total, 51 square centimeters per hole in the embodiment described later).

[0015] Solution (a): "Installation of a ventilation box (4) on the boiler frame wall (frame side plate (33))" A ventilation box (4) (secondary air guide plate) is installed on the back (outside) surface of the secondary air inlet holes (33f and 33h) of the boiler frame wall (frame side plate (33)), ensuring an air passage through which secondary air flows vigorously into the boiler frame. In this air passage, the temperature rises due to combustion inside the boiler frame, creating a so-called draft effect, which causes air to flow in from the lower part of the boiler frame (below and in the middle of the flame above the burner head) and efficiently guide it to the secondary air inlet holes. Note that "open" and "closed" in "the upper end (4b) is closed, the side end (4j) is closed, and the lower end (4p) is open" of the ventilation box (4) mean "almost open or almost closed" (not "completely"). The outside of the ventilation box (4) is "closed" in the same sense. The dimensions of the space between the boiler frame wall (frame side plate (33)) and the ventilation box 4 (secondary air guide plate) are preferably such that the height of the air passage inside the box is 10 to 15 mm and the width of the box is 120 to 200 mm. The height of the ventilation box 4 (vertical dimension) is preferably such that it covers the secondary air inlet hole from the bottom of the boiler frame wall, and experimental values ​​have determined that 130 to 190 mm is desirable.

[0016] Solution (c): "Addition of a secondary air intake (26b) to the main body side panel." In the embodiment described later, in order to allow even more secondary air to flow into the boiler frame (frame side plate (33)), secondary air intake ports (26b) were provided on the left and right bottoms of the main body side plate (25) located at the bottom of the boiler frame (more preferably also on the front bottom). As an example, these intake ports were 20 x 400 mm (a long slit shape extending along the edge of the bottom of the main body). The flow of secondary air from these secondary air intake ports (26b) into the range body (bottom of the boiler frame) was promoted, and consequently, the flow of secondary air from the secondary air inlet holes into the combustion chamber was promoted. Furthermore, if there are already sufficient secondary air intakes in the lower part of the main body's side wall, it may not be necessary to add a secondary air intake (26b) as in the embodiment.

[0017] Results of the solution; example of increased output. With the above means, the Chinese range has a structure in which more secondary air is sent into the combustion chamber during combustion, thereby suppressing the amount of carbon monoxide generated by combustion. In the case of the standard Chinese range described in the problem section, the maximum heating power was successfully increased from 18,000 kcal / h to 20,000 kcal / h (in the case of the embodiments of the present invention (described later), regardless of whether LPG or city gas 13A is used). Of course, the amount of gas (fuel) input to the burner was also increased at the above ratio. As a method for increasing the gas amount, in the embodiments described later, the flame port net ring of the flame outlet was replaced with one having a wider opening.

[0018] The name of the present invention is "Chinese range", and in the claims, the pan to be heated is referred to as a "Chinese pan". However, the technical scope of the present invention is not limited to these, and it also extends to equipment such as ranges and stoves for cooking that require similar high heating power, and cooking utensils (such as frying pans) used for such cooking.

Advantages of the Invention

[0019] In the combustion space of the Chinese range of the present invention, by establishing a structure in which secondary air is supplied more efficiently to the flame of the internal flame port burner, the air-fuel consumption required for combustion increases, the combustion efficiency improves, and while the main body is compact, a high heating power (calorie increase) of the burner output can be achieved. As a result, as described in the background art and the problem section, in a Chinese range using an internal flame port burner that is suitable for "stir-frying (stir-frying vegetables, fried rice, etc.)" which requires the characteristic of concentrating heat on the bottom of the pan, calorie increase within a limited combustion space has made it possible to perform stir-frying in a shorter time, which can be said to be an achievement that attracts many Chinese chefs.

Brief Description of the Drawings

[0020] [Figure 1]It is a diagram of the Chinese range 1 according to an embodiment of the present invention. (A) is a schematic front sectional view showing the structure near the pot frame 3, the inner flame port burner 5, and the main body 2. (B) is a side sectional view showing an enlarged view of the periphery of the ventilation box 4 and the secondary air intake holes 33f and 33h. (C) is a view taken in the direction of the C-C arrow of the same periphery. [Figure 2] It is a schematic side sectional view of the Chinese range 1 in FIG. 1. [Figure 3] It is a plan view showing the arrangement of the burner 5, the frame side plate 33, the ventilation box 4, and the secondary air intake port 26b of the Chinese range 1 in FIG. 1. [Figure 4] It is a diagram published in the summary of Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2001-272008) (the reference signs are changed). [Figure 5] It is a diagram schematically showing the configuration outline of the currently commercially available Chinese range 401 and the flow of primary air and secondary air supplied to the burner 405.

Explanation of Reference Signs

[0021] 1; Chinese range, 10; Chinese pot, 15; Sil holder 2; Main body, 21; Upper part, 24; Upper surface, 25; Side plate, 25k; Bottom part 26; Bottom edge plate of the main body, 26b; Secondary air intake port, 29; Drainage groove 3; Pot frame, 31; Grid part, 31x; Lower part, 33; Frame side plate, 33f, 33h; Secondary air inlet 4; Ventilation box, 4b; Upper end, 4j; Side end, 4p; Lower end 5; Inner flame port burner, 5t; Upper surface 51; Outer ring, 51b; Inner edge, 52; Inner ring, 52b; Inner edge 6; Gas and primary air supply system, 61, 63; Tubes, 8; Back plate, 9; Legs 402; Main body, 403; Pot frame, 405; Inner flame port burner, 406; Gas and primary air supply part 407; Gas supply system, 408; Back plate, 409; Legs 425; Left and right side plates, 425j; Secondary air intake port, 426; Back panel, 426j; Secondary air intake port 433; Frame side plate, 433z; Lower edge 446; Trumpet tube; 461-463; Gas / primary air supply tube 471; Gas pipe, 473; Gas cock, 475; Main body inner tube, 477; Embodiment of the tapered tube invention

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each diagram, the directions indicated by the arrows, "up" and "down," are in line with Earth's gravity. "Foreground" is the side where the cook stands, operates the lever on the gas cock 473 (see Figure 5(A)) to adjust the heat of the range, and cooks by tossing the wok 10, etc. "Background" is the far direction opposite to the cook. "Left" and "right" are the left and right directions as the cook looks towards the Chinese range 1. As shown in Figure 1, the Chinese range 1 consists of a pot frame 3 (trivet section 31) on which the wok 10 is placed, an internal flame burner 5 located at the lower center of the pot frame 3, and a main body 2 that houses the pot frame and burner.

[0023] The main body 2 is rectangular in shape, and the upper part 21 serves as a base for mounting the pot frame 3. A circular opening is provided in the center of the upper part 21, into which the cylindrical frame side plates 33 of the pot frame 3 are fitted so as to hang downwards. The upper part of the pot frame 3 serves as a trivet 31 on which the pot 10 is placed. Legs 9 are attached to the bottom of the main body 2. As mentioned above, the front side of the main body 2 is provided with a gas supply system 407, as shown in Figure 5(A). A Chinese range in which the gas supply system 407 protrudes from the front side of the main body 2 in this manner is called an "external tube type Chinese range." However, the present invention is not limited to the "external tube type" and can also be applied to "internal tube type" ranges in which the gas supply system 407 is housed inside the main body.

[0024] As shown in Figure 2, the main body 2 of the Chinese range 1 in this embodiment is equipped with a drain groove 29 and a back plate 8 on the rear side (back side). The drain groove 29 is a groove that drops low from the top surface 24 of the main body 2 and is the part that drains water used to wash the wok 10. The back plate 8 is the part that catches oil splatters during cooking.

[0025] As shown in Figure 3, the burner 5 of the Chinese range 1 in this embodiment has two annular internal flame port burners, an outer ring 51 and an inner ring 52 (same as current products). The outer ring 51 and inner ring 52 consist of a ring-shaped member that is split into upper and lower halves, and flame port mesh rings (not shown) fitted to the inner edges 52b and 51b of each. A mixture of fuel gas and primary air flows inside the outer ring 51 and inner ring 52. The inner edge 51b of the outer ring 51 becomes the outer ring flame port, and the inner edge 52b of the inner ring 52 becomes the inner ring flame port. By adjusting the size of the opening of each flame port mesh ring, the maximum flame output from each flame port can be adjusted. Burners with such a double-ring structure are currently commercially available and known, and the method for adjusting their maximum flame output is also known.

[0026] Furthermore, there is a space in the center of the inner ring 52, and between the inner ring 52 and the outer ring 51, and the air rising through this space becomes secondary air for burner combustion. The gas supply system and primary air supply system of the Chinese range 1 in this embodiment have the same configuration and operation as the current Chinese range 401 shown in Figure 5. In Figure 1(A), the pipe 61 on the right side of the gas / primary air supply system 6 is for the inner ring 52, and the pipe 63 on the left side is for the outer ring 51.

[0027] Referring to Figures 1, 2, and 3, the configuration and operation related to the secondary air, which is a characteristic feature of this embodiment, will be explained. Note that the Chinese range 1 of this embodiment also includes the secondary air supply system (secondary air inlets 425j and 426j) of the current Chinese range 401 shown in Figure 5, and in addition to these, it also includes a secondary air supply system having the characteristic configuration and operation described below. Figure 1 shows a diagram of a Chinese range 1 according to an embodiment of the present invention, where (A) is a schematic front cross-sectional view showing the structure around the pot frame 3, internal flame burner 5, and main body 2, (B) is a side cross-sectional view showing an enlarged view of the area around the ventilation box 4 and secondary air intake holes 33f and 33h, and (C) is a view of the same area as seen by arrow CC. Figure 2 is a schematic side cross-sectional view of the Chinese range 1 shown in Figure 1. Figure 3 is a plan view showing the arrangement of the burner 5, frame side plate 33, ventilation box 4, and secondary air intake 26b of the Chinese range 1 shown in Figure 1.

[0028] The wok frame 3 of the Chinese range 1 in this embodiment has a cylindrical frame side plate 33 that extends downward from the trivet portion 31 on which the wok 10 is placed. The internal flame burner 5 is positioned in the lower center of the wok frame 3. Secondary air inlets 33f and 33h are formed in the frame side plate 33 above the burner 5, penetrating the frame side plate 33. In this example, the height of the lower secondary air inlet 33h is slightly above (10 mm above) the upper surface (burner head) of the ring-shaped burner 5. The height of the upper secondary air inlet 33f is in the upper and lower intermediate part between the upper surface 5t of the burner 5 and the lower part 31x of the trivet portion 31 (70 mm above the burner head). In this example, the secondary air inlets 33f and 33h have a diameter of 21.5 mm and are arranged in groups of a certain number (in this specific example, 5 at the top with a pitch of 27.1 mm, and 6 at the bottom with a pitch of 24.6 mm) on both the left and right sides and the front side of the frame side plate 33.

[0029] A ventilation box 4 is attached to the outer surface of the outer frame side plate 33 of a group (two rows, upper and lower) of secondary air inlets 33f and 33h, so as to cover the secondary air inlets 33f and 33h. The ventilation box 4 is a relatively low (thin, e.g., 13 mm high) box shape. The ventilation box 4 has an outer plate 4g that is approximately parallel to the outer surface of the frame side plate 33. The upper end 4b and side end 4j of the ventilation box 4 are closed (bound by walls), and the lower end 4p is open (without walls). As shown in Figure 3, a group of secondary air inlets 33f and 33h, and the ventilation box 4 outside them, are provided in three locations in a plan view: on the left and right sides of the burner 5, and on the front side. While a secondary air inlet and ventilation box 4 could also be provided at the rear, in this example, they are not provided at the rear due to maintenance considerations for the burner. Nevertheless, the goal of increasing firepower is achieved.

[0030] The inside of the ventilation box 4 becomes extremely hot (80°C in one example) because it is affected by the flame of the burner 5, separated only by a single frame side plate 33. On the other hand, the temperature between the outside of the frame side plate 33 and the inside of the main body side plate 25 is 30°C in one example. Therefore, the inside of the ventilation box 4 becomes negatively pressurized due to the chimney effect (draft effect), and air is forcefully drawn in from the opening 4p at the lower end, and the wind (secondary air) is forcefully blown in from the secondary air inlets 33f and 33h towards the upper center of the burner 5. As a result of this effect, secondary air reaches the center of the burner flame, making it possible to supply a large amount of fuel gas to the narrow combustion space while avoiding the generation of harmful CO.

[0031] In this embodiment, a secondary air intake 26b is provided in the main body bottom edge plate 26, which runs along the bottom 25k of the main body side plate 25, below the ventilation box 4. As shown in Figure 3, the secondary air intake 26b is cut out as a long slit-shaped opening (example dimensions 400 mm x 20 mm) across almost the entire width of the elongated main body bottom edge plate 26 between the legs 9 at the four corners. A sill receiver 15 is positioned on the central side of each side of the main body bottom edge plate 26. Diagonally above the secondary air intake 26b, there is a bottom opening 4p of the ventilation box 4, with no obstacles or bends in between. Therefore, the air entering from the secondary air intake 26b is smoothly guided into the ventilation box 4. Then, due to the chimney effect of the ventilation box 4, it is introduced into the burner flame as a rapid flow of secondary air from the secondary air inlets 33f and 33h. This powerful additional inflow of secondary air successfully increased the maximum heat output from 18,000 kcal / h to 20,000 kcal / h in this embodiment, in the case of a standard Chinese range.

Claims

1. A pot frame (3) having a trivet section (31) on which a wok (10) is placed, and a cylindrical frame side plate (33) extending downward from the same section, The internal flame burner (5) is located in the lower center of the pot frame, The main body (2) is equipped with the aforementioned boiler frame (3) and houses the aforementioned burner (5), A Chinese range (1) equipped with, A secondary air inlet (33f・33h) is formed in the frame side plate (33) at a portion above the upper surface (5t) of the burner (5), and penetrates the frame side plate (33). A Chinese range (1) is characterized in that a ventilation box (4) is attached to the outside of the frame side plate (33) where the secondary air inlets (33f and 33h) are located, the upper end (4b) is closed, the side end (4j) is closed, and the lower end (4p) is open.

2. The Chinese range (1) according to claim 1, characterized in that a secondary air intake (26b) is provided on the main body bottom edge plate (26) which is located below the ventilation box (4) and along the bottom (25k) of the side plate (25) of the main body (2).

3. The Chinese range (1) according to claim 1 or 2, characterized in that the secondary air inlets (33f and 33h) are provided in the frame side plate (33) between the upper surface (5t) of the burner (5) and the lower part (31x) of the trivet (31).

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