Stove burner, gas stove

Abstract

To provide a cooking stove burner capable of normally burning fuel gas even when using it continuously for many hours in a high fire power state, and a gas cooking stove.SOLUTION: A burner body (30) of a cooking stove burner (10) has a disc-shaped bottom wall part (31) and a cylindrical outer cylinder part (32), in which a burner head (20) is mounted on an outer cylinder part and a fuel gas is supplied from a gas supply part (50) connected to the center of the bottom wall part from below. The gas supply part supports weights of the burner head and the burner body in the center of the bottom wall part. In such a configuration, a great bending load by weights of the burner head and the burner body is imposed on the bottom wall part, so that a deformation suppressing member (44) formed by a material of higher melting point than the burner body is fitted to the bottom wall part. Then, even when the burner head and the burner body have high temperature, deformation of the bottom wall part can be suppressed, so that it is possible to burn the fuel gas normally.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a stove burner that includes a burner body to which fuel gas is supplied, a burner head placed on the burner body, and a gas supply unit that supplies fuel gas to the burner body, and burns the fuel gas by causing the fuel gas to flow out from a plurality of flame ports formed in the burner head, and a gas stove equipped with the stove burner.

Background Art

[0002] There is known a stove burner that includes a cylindrical burner body and a burner head placed on the burner body, and burns fuel gas by igniting the fuel gas flowing out from a plurality of flame ports formed in the burner head. A gas supply unit for supplying fuel gas is connected to the burner body, and fuel gas is supplied from a gas supply passage formed inside the gas supply unit to the burner body.

[0003] In a general stove burner, the gas supply unit is connected to the side surface of the burner body, and fuel gas is supplied from the side surface of the burner body. However, in a large-sized stove burner, the gas supply unit is connected to the center of the bottom surface of the burner body, and fuel gas is supplied from the center of the bottom surface to the burner body. Also, in a general stove burner, the burner body and the gas supply unit are integrally formed, but in a large-sized stove burner, the burner body and the gas supply unit are separately formed. And the gas supply unit is connected to the burner body in a state where the position of the gas inlet formed in the burner body and the position of the gas supply passage formed in the gas supply unit are aligned.

[0004] Here, if the connection between the burner body and the gas supply unit is not tightly sealed, there is a risk of fuel gas leaking out. Therefore, the gas supply unit is structured to support the weight of the burner body and burner head from below. With this structure, the weight of the burner body and burner head presses the burner body against the gas supply unit, ensuring a tight connection between the burner body and the gas supply unit, thus preventing fuel gas from leaking out (Patent Documents 1 and 2). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2013-142500 [Patent Document 2] Japanese Patent Publication No. 2017-125637 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, in recent years, due to demands for cost reduction and other reasons, the burner body has been made of aluminum alloy, and consequently, a problem has arisen where the fuel gas cannot be properly combusted when used continuously at high heat for a long period of time. The reason for this is as follows:

[0007] Firstly, metals such as aluminum alloys, used to reduce costs, have lower melting points compared to brass and other metals that have been used conventionally. Also, when a stove burner is used continuously at high heat for a long period of time, the burner head and burner body become hot. In addition, as mentioned above, in large stove burners, the gas supply unit is connected to the center of the bottom of the burner body, and the gas supply unit is structured to support the weight of the burner body and burner head. Therefore, when the burner body becomes hot due to prolonged use at high heat, the bottom of the burner body deforms under the weight of the burner body and burner head. As a result, the burner head may not be able to be properly placed on the burner body, or the position of the burner head may drop, making it difficult to maintain the distance to the top plate of the gas stove, thus making it difficult to burn the fuel gas properly.

[0008] This invention was made to solve the aforementioned problems of the conventional technology, and aims to provide a stove burner and gas stove that can burn fuel gas normally even when used continuously for a long period of time under high heat conditions. [Means for solving the problem]

[0009] To solve the above-mentioned problems, the stove burner of the present invention employs the following configuration: A stove burner comprising a burner body to which fuel gas is supplied, a burner head mounted on the burner body and formed in an annular or disc shape, and a gas supply unit connected to the burner body and having a gas supply passage formed inside for supplying the fuel gas to the burner body, wherein the fuel gas is burned by causing the fuel gas to flow out from a plurality of flame ports formed in the burner head, The aforementioned burner body is, An outer cylinder formed in a cylindrical shape, on which the burner head is placed on a mounting surface formed at the upper end of the cylindrical shape, The bottom wall portion that forms the bottom surface of the outer cylinder portion, A connection portion is formed in the center of the bottom wall portion, to which the gas supply portion is connected from below, and to which a gas inlet is formed through which the fuel gas flows in from the gas supply passage of the gas supply portion. Equipped with, The gas supply unit supports the weight of the burner body and the burner head by being connected to the connection unit from below the burner body. A deformation-retaining member is attached to the bottom wall portion, which is made of a material with a higher melting point than the burner body, in order to prevent deformation of the bottom wall portion. It is characterized by the following:

[0010] In the stove burner of the present invention, the weight of the burner head and burner body is supported by the gas supply unit at the position of the connection part formed in the center of the bottom wall. As a result, the bottom wall of the burner body is subjected to a large bending load due to the weight of the burner head and burner body. Therefore, a deformation-reducing member made of a material with a higher melting point than the burner body is attached to the bottom wall.

[0011] When a stove burner is used continuously at high heat for a long period of time, the burner head and burner body can become very hot, and when the burner body becomes hot, the bottom wall also becomes hot. Generally, metal materials lose strength at high temperatures, so there is a risk that the bottom wall may deform under large bending loads. If the bottom wall deforms, the burner head cannot be properly placed on the outer cylinder of the burner body, making it difficult to burn the fuel gas properly. However, a deformation-reducing member made of a material with a higher melting point than the burner body is attached to the bottom wall, so deformation of the bottom wall can be suppressed. As a result, even when used continuously at high heat for a long period of time, deformation of the bottom wall of the burner body can be suppressed, making it possible to burn the fuel gas properly.

[0012] In the stove burner of the present invention described above, the deformation suppressing member may be attached to the lower surface of the bottom wall.

[0013] This way, the bottom wall, which tends to deform downward due to the weight of the burner head and outer cylinder, can be supported from below by the deformation-suppressing member, thus easily suppressing deformation of the bottom wall of the burner body.

[0014] Furthermore, the present invention described above can also be applied to a stove burner having a large annular burner head and a small disc-shaped burner head with a smaller diameter than the large burner head. Specifically, the burner body has a middle cylinder section which is cylindrical in shape with a smaller diameter than the outer cylinder section of the burner body and is arranged coaxially with the outer cylinder section, and a small cylinder section which is cylindrical in shape with a smaller diameter than the middle cylinder section and is arranged coaxially with the middle cylinder section, and the outside of the middle cylinder section and the inside of the small cylinder section are connected by multiple connecting passages. The connecting passages are formed as the bottom surface in a part of the bottom wall section. Furthermore, multiple flame ports are formed on the outer peripheral side surface of the large burner head, and the radially outer portion of the large burner head is fitted into the middle cylinder section while the radially outer portion of the large burner head is placed on the mounting surface of the outer cylinder section. Similarly, multiple flame ports are formed on the outer peripheral side surface of the small burner head, and the small burner head is placed on a mounting surface formed at the upper end of the small cylinder section of the burner body. Furthermore, air supply ports are formed in the spaces between the multiple connecting passages formed on the upper surface of the bottom wall to supply air to the small burner head, and through-holes or notches are formed in the deformation suppression member at positions that overlap with the air supply ports of the bottom wall.

[0015] In the aforementioned stove burner of the present invention, which is equipped with a large burner head and a small burner head, it is possible to generate a large flame, so if it is used continuously for a long period of time at a high flame, the stove burner tends to become hot. On the other hand, the weight of the large burner head and the outer cylinder of the burner body puts a large bending load on the bottom wall. Therefore, in such a stove burner, deformation of the bottom wall of the burner body can be suppressed by attaching a deformation suppression member to the bottom wall. As a result, even when used continuously for a long period of time at a high flame, deformation of the burner body can be suppressed, making it possible to burn the fuel gas normally.

[0016] In addition, in the stove burner of the present invention having a large burner head and a small burner head, the burner body may be formed by combining the following upper burner body and lower burner body. First, an outer cylinder portion and a bottom wall portion are formed in the lower burner body. Further, in the upper burner body, a middle cylinder portion, a small cylinder portion, and a plurality of connecting portions connecting the middle cylinder portion and the small cylinder portion are formed. Then, by placing the upper burner body on the bottom wall portion of the lower burner body, the connecting portions of the upper burner body may be brought into contact with the bottom wall portion of the lower burner body to form a connecting passage.

[0017] In this way, it becomes possible to easily manufacture a stove burner having a large burner head and a small burner head.

[0018] In addition, in the stove burner of the present invention in which the upper burner body is placed on the lower burner body, a plate-like deformation suppressing member may be sandwiched between the bottom wall portion of the lower burner body and the upper burner body.

[0019] In this way, when the user of the stove burner cleans the stove burner, it can be made difficult for the user to notice that the deformation suppressing member is attached. Therefore, it is possible to prevent a situation where the aesthetic appearance of the stove burner is impaired by the deformation suppressing member.

[0020] In addition, in the stove burner of the present invention described above, the burner body may be formed of an aluminum alloy, and the deformation suppressing member may be formed of stainless steel.

[0021] For the manufacture of the burner body, it is required that processing is easy and dimensional accuracy is easy to obtain. Therefore, if the burner body is formed of an aluminum alloy, these requirements can be satisfied simultaneously. In addition, for the deformation suppressing member, it is required that the melting point is higher than the material forming the burner body, it has corrosion resistance, and further, deformation is small even when it is rapidly cooled by applying a liquid or the like. However, if the deformation suppressing member is formed of stainless steel, these requirements can be satisfied simultaneously.

[0022] Further, the above-described burner of the present invention may be mounted on a gas stove.

[0023] By doing so, it becomes possible to realize a gas stove that can normally burn fuel gas even when continuously used for a long time in a high heating power state.

Brief Description of the Drawings

[0024] [Figure 1] It is a perspective view showing the external shape of the gas stove 1 of this embodiment. [Figure 2] It is a perspective view showing the external shape of the burner 10 of this embodiment mounted on the gas stove 1. [Figure 3] It is an exploded assembly view showing the structure of the burner 10 of this embodiment. [Figure 4] It is a perspective view showing the shape of the bottom surface side of the burner body 30. [Figure 5] It is an exploded assembly view showing the structure of the burner body 30. [Figure 6] It is an explanatory view exemplifying the deformation suppressing member 44 in which the notch portion 44c is formed. [Figure 7] It is a cross-sectional view showing a state in which the burner body 30 is connected above the gas supply unit 50 by cutting the burner 10 of this embodiment in the vertical direction. [Figure 8] It is a cross-sectional view obtained by cutting the conventional burner 90 to which the deformation suppressing member 44 is not attached in the vertical direction. [Figure 9] It is an exploded assembly view showing the structure of the burner 10 of the first modification. [Figure 10] It is an exploded assembly view showing the structure of the burner 70 of the second modification.

Modes for Carrying Out the Invention

[0025] A. This embodiment: Figure 1 is a perspective view showing the external shape of the gas stove 1 of this embodiment. As shown in the figure, the gas stove 1 of this embodiment comprises a sheet metal stove body 2 formed in the shape of a box with an open top, a top plate 3 placed on the stove body 2 and covering the top surface of the stove body 2, and two stove burners 10 mounted inside the stove body 2 with their upper parts protruding from an opening (not shown) formed in the top plate 3. In addition, operating knobs 6 for igniting each stove burner 10 and adjusting the flame are provided on the top plate 3, and a trivet 5 formed in a shape that surrounds the stove burner 10 and used for placing cooking containers such as pots is mounted on each stove burner 10.

[0026] Figure 2 is a perspective view showing the external shape of a stove burner 10 mounted on a gas stove 1. As shown in the figure, the stove burner 10 of this embodiment has a structure in which a burner body 30 is placed on a gas supply unit 50 to which fuel gas is supplied, and a burner head 20 is placed on the burner body 30. The burner head 20 has a large annular burner head 21 and a small disc-shaped burner head 22 which is smaller in diameter than the large burner head 21. Multiple flame ports 21f are formed on the outer peripheral side of the large burner head 21 from which combustion gas flows out, and multiple flame ports 22f are formed on the outer peripheral side of the small burner head 22 from which combustion gas flows out.

[0027] Figure 2 shows magnified views of a portion of the outer periphery of the large burner head 21 and a portion of the outer periphery of the small burner head 22, illustrating that multiple flame ports 21f are formed on the outer periphery of the large burner head 21 and multiple flame ports 22f are formed on the outer periphery of the small burner head 22. In this embodiment, both the large burner head 21 and the small burner head 22 are formed from forged or cast brass.

[0028] The gas supply unit 50 is a component formed from a cast iron casting, and two gas supply pipes 51 and 52 are formed in the gas supply unit 50. Of these, the large-diameter gas supply pipe 51 (hereinafter referred to as the large gas supply pipe 51) is connected to the large burner head 21 via the burner body 30, and when fuel gas is injected into the large gas supply pipe 51 from a fuel injection nozzle 51n attached to an open end (not shown) of the large gas supply pipe 51, the fuel gas flows out from a flame port 21f formed on the outer surface of the large burner head 21. The small-diameter gas supply pipe 52 (hereinafter referred to as the small gas supply pipe 52) is connected to the small burner head 22 via the burner body 30, and when fuel gas is injected into the small gas supply pipe 52 from a fuel injection nozzle 52n attached to an open end (not shown) of the small gas supply pipe 52, the fuel gas flows out from a flame port 22f formed on the outer surface of the small burner head 22. The internal structure of the burner body 30 will be described later. In this embodiment, the burner body 30 is formed by die-casting of an aluminum alloy, but it is not limited to aluminum alloy; zinc alloy, magnesium alloy, copper alloy, etc., can also be used. Furthermore, the burner body 30 may be formed by forging or casting, not just die-casting.

[0029] A spark plug 60 is provided on the side of the large burner head 21, and a flame sensor 61 is provided on the side of the small burner head 22. Therefore, when a spark is emitted from the spark plug 60 and fuel gas is released from the multiple flame ports 21f of the large burner head 21, the fuel gas can be ignited. This flame then spreads to adjacent flame ports 21f one after another, allowing combustion of the fuel gas to begin in the large burner head 21. In addition, a radially extending slit-shaped flame-spreading port 21g is formed on the upper surface of the large burner head 21. Therefore, when combustion begins in the large burner head 21, the flame travels through the flame-spreading port 21g to the flame ports 22f of the small burner head 22. Then, in the small burner head 22, the flame spreads to adjacent flame ports 22f one after another, and combustion of the fuel gas begins in all of the flame ports 22f. When combustion begins in all of the flame ports 22f of the small burner head 22, the flame sensor 61 detects the flame, making it possible to recognize that combustion has started in the small burner head 22.

[0030] Figure 3 is an exploded assembly view showing the structure of the stove burner 10 of this embodiment. As shown in the figure, the stove burner 10 of this embodiment has a structure in which the burner body 30 is placed on the gas supply unit 50, and the burner head 20 is placed on the burner body 30. The burner head 20 has a large burner head 21 formed in an annular shape and a small burner head 22 which is smaller in diameter than the large burner head 21 and formed in a disc shape. A cylindrical wall 21a is formed on the radially outer side (i.e., outer edge portion) of the large burner head 21, extending downwards, and a plurality of flame port grooves 21b are drilled upwards through the cylindrical wall 21a at the lower end surface of the cylindrical wall 21a. In addition, a cylindrical fitting wall 21c is formed on the radially inner side (i.e., inner edge portion) of the large burner head 21, extending downwards. Furthermore, the small burner head 22 has a cylindrical wall 22a formed radially outward (i.e., outer edge portion) that extends downward, and multiple flame port grooves 22b are drilled upward through the lower end surface of the cylindrical wall 22a.

[0031] Roughly speaking, the burner body 30 has a cylindrical outer section 32 erected upward on the outer edge of a disc-shaped bottom wall 31, a smaller diameter cylindrical middle section 33 erected coaxially with the outer section 32 and facing upward inside the outer section 32, and a smaller diameter cylindrical middle section 34 erected coaxially with the middle section 33 and facing upward inside the middle section 33. The middle section 33 and the small section 34 are connected by four radially extending connecting sections 35.

[0032] Each connecting section 35 has a connecting passage 35a formed inside, with one end of each connecting passage 35a opening to the outer surface of the central cylindrical section 33 and the other end opening to the inner surface of the small cylindrical section 34. Furthermore, an air supply passage 35b is formed between the connecting sections 35, penetrating the burner body 30 in the vertical direction to supply combustion air to the small burner head 22. The detailed structure of the burner body 30 will be explained in detail later.

[0033] Furthermore, a mounting surface 32a is formed at the upper end of the outer cylinder portion 32, which slopes downward toward the radially inward direction. When the cylindrical wall 21a of the large burner head 21 is placed on the mounting surface 32a, the lower ends of the multiple flame port grooves 21b drilled in the cylindrical wall 21a are blocked by the mounting surface 32a, thereby forming multiple flame ports 21f on the outer peripheral surface of the cylindrical wall 21a (see Figure 2). Similarly, a mounting surface 34a is formed at the upper end of the small cylinder portion 34, which slopes downward toward the radially inward direction. When the cylindrical wall 22a of the small burner head 22 is placed on the mounting surface 34a, the lower ends of the multiple flame port grooves 22b drilled in the cylindrical wall 22a are blocked by the mounting surface 34a, thereby forming multiple flame ports 22f on the outer peripheral surface of the cylindrical wall 22a (see Figure 2).

[0034] The gas supply unit 50 has a double-pipe structure with a cylindrical inner pipe section 54 inside a roughly cylindrical main body section 53, and a large gas supply pipe 51 and a small gas supply pipe 52 extend from the side of the main body section 53. A gas supply passage 52a (hereinafter referred to as the small gas supply passage 52a) is formed inside the small gas supply pipe 52, and the small gas supply passage 52a communicates with the inside of the inner pipe section 54. In addition, a gas supply passage 51a (hereinafter referred to as the large gas supply passage 51a) is formed inside the large gas supply pipe 51, and the large gas supply passage 51a communicates with the space between the main body section 53 and the inner pipe section 54. Using Figure 2, the fuel injection nozzle 51n described above injects fuel gas into the large gas supply passage 51a, and the fuel injection nozzle 52n injects fuel gas into the small gas supply passage 52a.

[0035] Mounting portions 55a and 55b for attaching the spark plug 60 and flame sensor 61 are provided at two locations on the side of the main body 53. The spark plug 60 and flame sensor 61 are attached to a sheet metal mounting bracket 62. The mounting bracket 62 is attached to the main body 53 by fixing the mounting hole 62a to the mounting portion 55a with a mounting bolt 56, and fixing the mounting hole 62b to the mounting portion 55b.

[0036] Furthermore, the upper part of the main body 53 is machined to form an insertion portion 53a by machining the outer surface to a cylindrical shape, and the upper end of the insertion portion 53a is machined to form a contact surface 53b by machining it flat. In addition, the upper part of the inner tube 54 is machined to form a cylindrical contact surface 54a by machining the inner surface. These insertion portion 53a, contact surface 53b, and contact surface 54a are structures for connecting the gas supply unit 50 to the burner body 30.

[0037] Figure 4 is a perspective view showing the shape of the bottom surface of the burner body 30, viewed from diagonally below. As shown in the figure, an annular deformation suppression member 44 is attached to the bottom surface of the burner body 30 by bolts 46. A cylindrical large connecting pipe 38 protrudes from the center of the deformation suppression member 44, and a cylindrical small connecting pipe 39 protrudes inside the large connecting pipe 38, coaxial with the large connecting pipe 38. The diameter of the outer surface of the small connecting pipe 39 is set to fit into the contact surface 54a (see Figure 3) formed on the inside of the inner pipe section 54 of the gas supply section 50. In addition, a cylindrical insertion surface 38a is formed on the inner surface of the large connecting pipe 38, and a flat, annular contact surface 38b is formed behind the insertion surface 38a. The inner diameter of the insertion surface 38a is set to accommodate the cylindrical insertion part 53a (see Figure 3) formed on the upper part of the main body 53 of the gas supply unit 50. These large connecting pipes 38 and small connecting pipes 39 form a connection part 37 for connecting the gas supply unit 50 to the bottom side of the burner body 30.

[0038] When connecting the burner body 30 and the gas supply unit 50, the small cylindrical connecting pipe 39 protruding from the bottom surface of the burner body 30 is positioned so that it is inserted inside the cylindrical contact surface 54a (see Figure 3) formed on the inner pipe portion 54 of the gas supply unit 50, and the burner body 30 is lowered from above the gas supply unit 50. Then, the cylindrical insertion portion 53a (see Figure 3) formed on the main body portion 53 of the gas supply unit 50 is inserted inside the cylindrical insertion surface 38a formed on the large connecting pipe 38 of the burner body 30. As the burner body 30 is lowered further, the contact surface 53b (see Figure 3) formed on the upper end of the main body portion 53 of the gas supply unit 50 comes into contact with the contact surface 38b formed behind the insertion surface 38a of the burner body 30. When the contact surface 53b of the gas supply unit 50 is brought into contact with the contact surface 38b of the burner body 30, the weight of the burner body 30 and the burner heads 20 (large burner head 21 and small burner head 22) causes the contact surface 38b and the contact surface 53b to be in close contact, making it possible to securely connect the gas supply unit 50 and the burner body 30.

[0039] Figure 5 is an exploded assembly diagram showing the structure of the burner body 30. As shown in the figure, the burner body 30 of this embodiment has a structure in which a small-diameter upper burner body 40 is placed on top of a large-diameter lower burner body 41, and an annular deformation suppression member 44 is attached to the bottom surface of the lower burner body 41.

[0040] The upper burner body 40 is formed from die-cast aluminum alloy and has a cylindrical middle section 33 and a smaller cylindrical section 34 with a smaller diameter than the middle section 33, which are connected at four points by radially extending connecting sections 35. The connecting sections 35 are trough-shaped with an open bottom, and the inside of the connecting sections 35 is a radially extending connecting groove 35c. One end of the connecting groove 35c passes through the middle section 33, and the other end of the connecting groove 35c passes through the smaller cylindrical section 34.

[0041] Inside the small cylindrical section 34, a disc-shaped partition wall 34b is formed horizontally at approximately the same height as the upper surface of the connecting section 35. A gas inlet 39a opens in the center of the partition wall 34b and communicates with a small gas supply passage 52a (see Figure 3). Therefore, the space inside the small cylindrical section 34 above the partition wall 34b is a small burner chamber 36b into which fuel gas supplied from the small gas supply passage 52a flows. In addition, a cylindrical small connecting pipe 39 (see Figure 4) is erected downwards from the partition wall 34b at the opening of the gas inlet 39a.

[0042] The lower burner body 41 is made of die-cast aluminum alloy and has a cylindrical outer tube portion 32 that rises upward from the outer edge of a disc-shaped bottom wall portion 31. A circular gas inlet 43 is open in the center of the bottom wall portion 31, and a cylindrical large connecting pipe 38 (see Figure 4) rises downward from the bottom wall portion 31 where the gas inlet 43 is open. In addition, four air supply ports 42a and four mounting holes 42b are formed in the bottom wall portion 31. Furthermore, four protrusions 42c are provided on the upper surface of the bottom wall portion 31 to facilitate alignment of the upper burner body 40 with respect to the lower burner body 41.

[0043] When assembling the upper burner body 40 to the lower burner body 41, the upper burner body 40 is placed on the bottom wall portion 31 of the lower burner body 41, and then the four mounting holes (not shown) formed on the bottom surface of the upper burner body 40 are aligned with the four mounting holes 42b formed in the bottom wall portion 31. This positions the upper burner body 40 so that the space between the connecting portions 35 formed on the upper burner body 40 is above the air supply port 42a of the bottom wall portion 31. In this state, the upper burner body 40 is then assembled to the lower burner body 41 from below using bolts 46. When this is done, the space between the connecting portions 35 and the air supply port 42a of the bottom wall portion 31 are connected, forming an air supply passage 35b for supplying combustion air to the small burner head 22 (see Figure 3). Furthermore, the connecting groove 35c formed on the inside of the connecting portion 35 is closed on the bottom side by the bottom wall portion 31 between the air supply ports 42a, thereby forming the connecting passage 35a as described in Figure 3.

[0044] Furthermore, the deformation suppression member 44 is fastened together with the lower burner body 41 using bolts 46 when assembling the upper burner body 40 to the lower burner body 41. As shown in Figure 5, the deformation suppression member 44 is an annular-shaped member, and its outer diameter is set to be smaller than the inner diameter of the outer cylinder portion 32 but larger than the outer diameter of the middle cylinder portion 33. In this embodiment, the deformation suppression member 44 is formed by punching out stainless steel sheet metal, but the material of the deformation suppression member 44 may be any metal other than stainless steel, as long as the melting point is higher than that of the lower burner body 41 and the upper burner body 40.

[0045] Furthermore, a circular through-hole 45 is formed in the center of the deformation suppression member 44, and the inner diameter of the through-hole 45 is set to a size that allows it to be externally fitted onto the large connecting pipe 38 protruding from the bottom surface of the lower burner body 41. In addition, four through-holes 44a and four mounting holes 44b are formed around the through-hole 45. When attaching the deformation suppression member 44 to the bottom surface of the lower burner body 41, the through-hole 45 is externally fitted onto the large connecting pipe 38 of the lower burner body 41, and the position of the mounting holes 44b of the deformation suppression member 44 is aligned with the position of the mounting holes 42b of the lower burner body 41. Then, the through-hole 44a of the deformation suppression member 44 is positioned at the air supply port 42a of the lower burner body 41. With the upper burner body 40 in this position, the mounting holes (not shown) of the upper burner body 40 are also aligned with the air supply port 42a of the lower burner body 41, and then the deformation suppression member 44, the lower burner body 41, and the upper burner body 40 are assembled from below using bolts 46. Furthermore, since the deformation suppression member 44 has a through-hole 44a, even if the deformation suppression member 44 is attached to the bottom surface of the lower burner body 41, the air supply port 42a of the lower burner body 41 is not blocked, and therefore the air supply passage 35b (see Figure 3) that supplies combustion air to the small burner head 22 is not blocked.

[0046] As shown in Figure 5, the deformation suppression member 44 in this embodiment is provided with a through-hole 44a. However, it is not necessary to form a through-hole 44a as long as the air supply port 42a is not blocked when the deformation suppression member 44 is attached to the bottom surface of the lower burner body 41. For example, as illustrated in Figure 6, a notch 44c may be formed instead of a through-hole 44a.

[0047] Figure 7 is a cross-sectional view showing the burner body 30 placed on the gas supply unit 50, obtained by cutting the stove burner 10 of this embodiment in the vertical direction. When the burner body 30 is placed on the gas supply unit 50, the contact surface 53b formed at the upper end of the insertion portion 53a of the gas supply unit 50 contacts the contact surface 38b formed at the back of the insertion surface 38a. When the contact surface 53b on the gas supply unit 50 side contacts the contact surface 38b on the burner body 30 side, the weight of the large burner head 21 and the small burner head 22 in addition to the burner body 30 is applied to the contact surface 53b via the contact surface 38b, causing the contact surface 38b and the contact surface 53b to be in close contact. Furthermore, in this state, the outer circumferential surface of the small connecting pipe 39 also comes into close contact with the contact surface 54a formed on the inside of the inner pipe portion 54.

[0048] Furthermore, a cylindrical wall 21a, which is erected downward from the outer edge of the large burner head 21, is placed on the mounting surface 32a formed at the upper end of the outer cylinder portion 32, and a fitting wall 21c, which is erected downward from the inner edge of the large burner head 21, has its outer circumferential surface sliding in contact with the inner circumferential surface of the middle cylinder portion 33. As a result, a large burner chamber 36a is formed between the outer cylinder portion 32 and the small cylinder portion 34, with the lower part being closed by the bottom wall portion 31 and the upper part being closed by the large burner head 21.

[0049] Furthermore, a connecting passage 35a is formed between the bottom wall portion 31 of the burner body 30 and the connecting portion 35. One end of the connecting passage 35a opens to the inside of the small cylindrical portion 34, and the other end of the connecting passage 35a opens to the outside of the medium cylindrical portion 33. Therefore, fuel gas injected into the large gas supply passage 51a inside the large gas supply pipe 51 (see Figure 3) is supplied to the large burner chamber 36a through the connecting passage 35a from the gas inlet 43 formed between the large connecting pipe 38 and the small connecting pipe 39, and then flows out from multiple flame ports 21f formed on the outer surface of the large burner head 21. Similarly, fuel gas injected into the small gas supply passage 52a inside the small gas supply pipe 52 (see Figure 3) is supplied to the small burner chamber 36b from the gas inlet 39a through the small connecting pipe 39, and then flows out from multiple flame ports 21f formed on the outer surface of the small burner head 22. Therefore, as described above using Figure 2, the spark plug 60 generates a spark to ignite the fuel gas flowing out from the flame port 21f, and the resulting flame ignites the fuel gas flowing out from the flame port 22f, thereby enabling the combustion of the fuel gas to begin. In this embodiment, the reason why the stove burner 10 has a deformation suppression member 44 attached to the bottom side of the burner body 30 is as follows.

[0050] Figure 8(a) is a cross-sectional view obtained by cutting a conventional stove burner 90 without the deformation suppression member 44 in the vertical direction. The stove burner 90 in Figure 8 differs from the stove burner 10 of this embodiment described using Figure 7 in that it does not have the deformation suppression member 44, but is otherwise the same. In the conventional stove burner 90 shown in Figure 8, as in the stove burner 10 of this embodiment shown in Figure 7, the weight of the burner body 30, the large burner head 21, and the small burner head 22 is supported by the contact surface 53b of the gas supply unit 50 at the position of the contact surface 38b formed in the center of the bottom wall 31. Here, for the small cylindrical part 34 of the burner body 30 and the small burner head 22, since the contact surface 53b is located below, the weight of the small cylindrical part 34 and the small burner head 22 is directly supported by the contact surface 53b. However, since the outer cylinder portion 32, the inner cylinder portion 33, and the large burner head 21 of the burner body 30 are located radially outward and at a distance from the contact surface 53b of the gas supply unit 50, the weight of the large burner head 21 and other components is transmitted to the contact surface 53b of the gas supply unit 50 via the bottom wall portion 31 (and partly the connecting portion 35). As a result, a large bending load is applied to the bottom wall portion 31 (and the connecting portion 35).

[0051] Furthermore, when the stove burner 10 or stove burner 90 is used continuously at high heat for a long period of time, the large burner head 21 and small burner head 22, as well as the upper burner body 40 and lower burner body 41 of the burner body 30, become hot. In addition, the upper burner body 40 and lower burner body 41 of the burner body 30 are made of aluminum alloy, and the strength of aluminum alloy decreases when it gets hot. Therefore, there is a risk that the bottom wall 31 (and connecting part 35) may bend due to the bending load applied to it. Figure 8(b) shows the bottom wall 31 and connecting part 35 in a bent state. Note that in Figure 8(b), the deformation caused by the bending of the bottom wall 31 and connecting part 35 is exaggerated to make it easier to recognize.

[0052] As shown in Figure 8(b), if the bottom wall portion 31 or the connecting portion 35 bends, the outer cylinder portion 32 will tilt or its position will be lowered, making it impossible to properly place the large burner head 21 on top of the outer cylinder portion 32. As a result, the shape of the flame port 21f will be distorted from its normal shape, making it difficult to properly burn the fuel gas. Furthermore, once the bottom wall portion 31 or the connecting portion 35 bends, it is difficult to return them to their original shape, making it difficult to properly burn the fuel gas thereafter.

[0053] In contrast, in the stove burner 10 of this embodiment, a deformation suppression member 44 is attached to the bottom side of the burner body 30 (see Figures 5 and 7). Furthermore, the material of the deformation suppression member 44 is made of a material with a higher melting point (stainless steel in this embodiment) than the material that forms the upper burner body 40 and lower burner body 41 of the burner body 30 (aluminum alloy in this embodiment). Therefore, even if the stove burner 10 becomes hot and the strength of the upper burner body 40 and lower burner body 41 decreases, the deformation suppression member 44 can support the bending load applied to the bottom wall 31 and connecting part 35, thereby preventing the bottom wall 31 and connecting part 35 from bending. As a result, even when the stove burner 10 is used continuously at high heat for a long period of time, it is possible to burn the fuel gas normally.

[0054] B. Variant: Several variations exist for the stove burner 10 of the above-described embodiment. Below, these variations will be briefly described, focusing on the differences from this embodiment.

[0055] B-1. First variation: In the embodiment described above, the deformation suppressing member 44 was provided on the bottom side of the lower burner body 41 and assembled together with the lower burner body 41 and the upper burner body 40 using bolts 46. However, as shown in Figure 9, the deformation suppressing member 44 may be sandwiched between the upper burner body 40 and the lower burner body 41 and assembled together with the lower burner body 41 and the upper burner body 40 using bolts 46. Even in this first modified example of the stove burner 10, the deformation suppressing member 44 can receive the bending load applied to the bottom wall portion 31 and the connecting portion 35, so it is possible to suppress deformation of the bottom wall portion 31 and the connecting portion 35.

[0056] B-2. Second variation: Furthermore, in the embodiments and modifications described above, the burner head 20 was described as comprising a large burner head 21 and a small burner head 22 of different sizes. However, the burner head 20 does not necessarily have to comprise a large burner head 21 and a small burner head 22; it may be a single burner head 20.

[0057] Figure 10 is an exploded view showing the structure of a second modified stove burner 70 having a single burner head 20. As shown, in the second modified stove burner 70, the burner head 20 is formed in a disc shape, and a cylindrical wall 20a is erected downward from the outer edge of the disc shape, with multiple flame port grooves 20b formed upward on the lower end surface of the cylindrical wall 20a.

[0058] The burner body 30 of the second modification is also made of an aluminum alloy, similar to the burner body 30 of the embodiment described above. In the burner body 30 of the second modification, an outer cylinder portion 32 is erected upward from the outer edge of the disc-shaped bottom wall portion 31, and a mounting surface 32a is formed at the upper end of the outer cylinder portion 32 on which the cylindrical wall 20a of the burner head 20 is placed. A circular gas inlet 43 is opened in the center of the bottom wall portion 31, and a cylindrical connecting portion 37 is projected downward below the gas inlet 43. Inside the connecting portion 37, an insertion surface 38a and a contact surface 38b are formed, similar to the large connecting pipe 38 of the embodiment described above using Figure 4. Furthermore, an annular deformation suppression member 44 is attached to the bottom surface of the burner body 30 with bolts 46. The deformation suppression member 44 of the second modification is also made of a material with a higher melting point than aluminum alloy (for example, stainless steel), similar to the deformation suppression member 44 of the embodiment described above.

[0059] Furthermore, the gas supply unit 50 of the second modified example has a shape obtained by removing the small gas supply pipe 52 and the inner pipe section 54 from the gas supply unit 50 of this embodiment described above using Figure 3. On the upper part of the main body 53, a cylindrical insertion section 53a and an annular contact surface 53b are formed, similar to the gas supply unit 50 of this embodiment.

[0060] When placing the burner body 30 on the gas supply unit 50, the burner body 30 is positioned so that the insertion portion 53a of the main body 53 is inserted into the insertion surface 38a (see Figure 4) formed on the inside of the connection portion 37 of the burner body 30. Then, the burner body 30 is lowered until the contact surface 53b of the tip of the insertion portion 53a contacts the contact surface 38b on the inside of the connection portion 37. In this way, the weight of the burner body 30 and the burner head 20 presses the contact surface 38b of the burner body 30 against the contact surface 53b of the main body 53, causing the contact surface 38b of the burner body 30 and the contact surface 53b of the main body 53 to be in close contact.

[0061] Even in this second modified example of the stove burner 70, the outer cylinder portion 32 is located at a position radially outward from the contact surface 53b, so a large bending load is applied to the bottom wall portion 31 of the burner body 30 due to the weight of the outer cylinder portion 32 and the burner head 20. However, since a deformation suppression member 44 is attached to the bottom side of the outer cylinder portion 32, deformation of the bottom wall portion 31 can be suppressed. As a result, even when the stove burner 70 is used continuously at high heat for a long period of time, it is possible to burn the fuel gas normally.

[0062] Although the embodiments and various modifications have been described above, the present invention is not limited to the embodiments and modifications described above, and can be implemented in various forms without departing from the spirit of the invention. [Explanation of Symbols]

[0063] 1...Gas stove, 2...Stove body, 3...Top plate, 5...Trivet, 6...Operation knob, 10...Cooktop burner, 20...Burner head, 20a...Cylindrical wall, 20b...Flame outlet groove, 21...Large burner head, 21a...Cylindrical wall, 21b...Flame opening groove, 21c...Fitting wall, 21f...Flame opening 21g...flame transfer port, 22...small burner head, 22a...cylindrical wall, 22b...Flame nozzle groove, 22f...Flame nozzle, 30...Burner body, 31...Bottom wall section, 32...Outer cylinder part, 32a...Mounting surface, 33...Middle cylinder part, 34...Small cylinder part, 34a... Mounting surface, 34b... Partition wall section, 35... Connecting section, 35a... Connecting passage, 35b...Air supply passage, 35c...Connecting groove, 36a...Large burner chamber, 36b...Small burner chamber, 37...Connection section, 38...Large connecting pipe, 38a...Inserted surface, 38b...Abutted surface, 39...Small connecting pipe, 39a...Gas inlet, 40...Upper burner body, 41...Lower burner body 42a...Air supply port, 42b...Mounting hole, 42c...Protrusion, 43...Gas inlet, 44...Deformation suppression member, 44a...Through opening, 44b…Mounting hole, 44c…Notch, 45…Through hole, 46…Bolt, 50...Gas supply section, 51...Large gas supply pipe, 51a...Large gas supply passage, 51n...fuel injection nozzle, 52...small gas supply pipe, 52a...small gas supply passage, 52n...fuel injection nozzle, 53...main body, 53a...insertion part 53b...contact surface, 54...inner pipe section, 54a...contact surface, 55a...mounting section, 55b...Mounting part, 56...Mounting bolt, 60...Spark plug, 61…Flame sensor, 62…Mounting bracket, 62a…Mounting hole, 62b...Mounting hole, 70...Cooktop burner, 90...Cooktop burner.

Claims

1. A stove burner comprising a burner body to which fuel gas is supplied, a burner head mounted on the burner body and formed in an annular or disc shape, and a gas supply unit connected to the burner body and having a gas supply passage formed inside for supplying the fuel gas to the burner body, wherein the fuel gas is burned by causing the fuel gas to flow out from a plurality of flame ports formed in the burner head, The aforementioned burner body is, An outer cylinder formed in a cylindrical shape, on which the burner head is placed on a mounting surface formed at the upper end of the cylindrical shape, The bottom wall portion that forms the bottom surface of the outer cylinder portion, A connection portion is formed in the center of the bottom wall portion, to which the gas supply portion is connected from below, and to which a gas inlet is formed through which the fuel gas flows in from the gas supply passage of the gas supply portion. The burner body has a cylindrical shape with a smaller diameter than the outer cylinder portion, and an inner cylinder portion is arranged coaxially with the outer cylinder portion, A small cylindrical section having a smaller diameter than the aforementioned central cylindrical section and arranged coaxially with the central cylindrical section, Multiple connecting passages that connect the outer side of the central cylinder and the inner side of the small cylinder Equipped with, The aforementioned burner head is A large burner head formed in an annular shape, wherein the radially outer portion of the annular shape is placed on the aforementioned mounting surface of the outer cylinder, the radially inner portion of the annular shape is fitted into the middle cylinder, and a plurality of flame ports are formed on the outer peripheral surface, A small burner head formed in a disc shape with a smaller diameter than the large burner head, which is placed on the mounting surface at the upper end of the small cylindrical portion, and which has multiple flame ports formed on its outer peripheral side surface. It is equipped with, A portion of the bottom wall of the burner body forms the bottom surface of the plurality of connecting passages. The bottom wall portion has air supply ports formed in the portions between the multiple connecting passages for supplying air toward the small burner head. The gas supply unit supports the weight of the burner body and the burner head by being connected to the connection unit from below the burner body. A deformation-retaining member is attached to the bottom wall portion, which is made of a material with a higher melting point than the burner body, in order to prevent deformation of the bottom wall portion. The deformation-suppressing member has a through-hole or notch formed in the bottom wall at a position that overlaps with the air supply port. A stove burner characterized by the following features.

2. In the stove burner according to claim 1, The deformation suppressing member is attached to the lower surface of the bottom wall portion. A stove burner characterized by the following features.

3. In the stove burner according to claim 1, The aforementioned burner body is, The lower burner body having the outer cylindrical portion and the bottom wall portion, An upper burner body having the middle cylindrical portion, the small cylindrical portion, and a plurality of connecting portions connecting the middle cylindrical portion and the small cylindrical portion, and placed on the bottom wall portion of the lower burner body. Equipped with, The multiple connecting passages are formed between the bottom wall and the connecting portion when the upper burner body is placed on the bottom wall of the lower burner body, as the connecting portion comes into contact with the bottom wall. A stove burner characterized by the following features.

4. In the stove burner according to claim 3, The deformation-suppressing member is a plate-shaped member sandwiched between the bottom wall portion of the lower burner body and the upper burner body. A stove burner characterized by the following features.

5. A stove burner according to any one of Claims 1 to 4, The burner body is made of an aluminum alloy material. The deformation suppressing member is made of stainless steel. A stove burner characterized by the following features.

6. A gas stove characterized by being equipped with a stove burner according to any one of claims 1 to 4.

Images