gas stove

Abstract

To provide a gas cooking stove (10) which can inhibit occurrences of problems caused by deformation of a top plate (30) sufficiently.SOLUTION: A rectangular top plate is placed on a cooking stove case (20) and an upper part of a cooking stove burner (40) protrudes from a burner opening (30a) of the top plate. Multiple flame holes (40a) for burning a fuel gas are formed on an outer peripheral side surface of the upper part of the cooking stove burner. The top plate is attached to the cooking stove case at a peripheral edge portion (34). Further, in an inner portion (35) at the inner side relative to the peripheral edge portion, trough parts (30v) where the top plate is bent in a convex shape facing downward and crest parts (30m) where the top plate is bent in a convex shape facing upward are formed at multiple positions along a longitudinal direction of the top plate. The structure allows heat expansion of the top plate to be dispersedly absorbed by the multiple trough parts and the crest parts and thus reduces deformation of the top plate. Consequently, problems caused by deformation of the top plate can be inhibited from occurring.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a gas stove that includes a top plate placed on a stove case, a stove burner whose upper part protrudes from a burner opening formed in the top plate, and a trivet placed on the top plate, and that heats and cooks food by burning fuel gas in the stove burner. [Background technology]

[0002] Gas stoves are commonly used to heat and cook food in cooking containers. Gas stoves are equipped with a burner that burns fuel gas to heat and cook food in the cooking container. The stove case of a gas stove is box-shaped and open at the top, with a top plate attached to close the top. A circular burner opening is formed in the top plate, and the burner is mounted inside the stove case with its upper portion protruding from the burner opening. The upper portion of the burner protruding from the burner opening has multiple flame ports formed on the outer periphery, allowing the fuel gas flowing out from the flame ports to be burned. A ring-shaped trivet is also placed on the top plate, surrounding the upper portion of the burner protruding from the burner opening. Therefore, food in the cooking container can be heated and cooked by placing a cooking container on the trivet and burning fuel gas with the burner.

[0003] When fuel gas is burned on a stove burner, the temperature of the top plate rises due to radiant heat from the combustion. As a result, the top plate undergoes thermal expansion. On the other hand, the stove case to which the top plate is attached is less affected by radiant heat from the combustion, so its temperature rise is less than that of the top plate, and its accompanying thermal expansion is also less than that of the top plate. Therefore, in order to absorb the greater thermal expansion than the stove case, the top plate attempts to deform by bending into an upward or downward convex shape. However, if the entire top plate were to bend into an upward convex shape, there is a risk that the combustion condition of the stove burner would deteriorate. The reason for this is that, because the stove burner is fixed to the stove case, when the top plate deforms into an upward convex shape, it comes close to the multiple flame nozzles formed on the outer peripheral side of the upper part of the stove burner. This makes it difficult to supply air to the flame of the fuel gas burning in the flame nozzles. Therefore, if the top plate deforms into an upward convex shape, once the deformation reaches a certain extent, it will no longer be possible to supply the air necessary for combustion at the flame port, which could result in a deterioration in the combustion condition of the stove burner.

[0004] Therefore, a stove burner has been proposed that aims to prevent the combustion condition of the stove burner from deteriorating by bending the top plate into a downward convex shape in advance, so that when the top plate is heated and thermal expansion occurs, it will always deform into a downward convex shape (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-020678 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional stove burners proposed do not deform upward, but can deform significantly downward, which can lead to various problems caused by deformation of the top plate (for example, rattling of the trivet or interference between the underside of the top plate and the mounted items below).

[0007] This invention has been made to solve the above-mentioned problems in the conventional technology, and aims to provide a gas stove that can fully suppress the occurrence of problems caused by deformation of the top plate. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the gas stove of the present invention employs the following configuration: A box-shaped stove case with an open top, A substantially rectangular top plate attached in a state of covering the top surface of the stove case; A stove burner is mounted on the stove case with its upper portion protruding from a burner opening formed in the top plate, and has a plurality of flame ports formed on the outer peripheral side surface of the upper portion protruding from the burner opening, and burns the fuel gas by letting the fuel gas flow out from the plurality of flame ports; a trivet placed on the top plate while surrounding an upper portion of the stove burner protruding from the burner opening; In a gas stove equipped with The top plate is attached to the stove case at a peripheral portion of the top plate, On the top plate, in a portion inside the peripheral edge portion, valley portions where the top plate is bent in a downward convex shape or peak portions where the top plate is bent in an upward convex shape are formed at a plurality of locations along the longitudinal direction of the top plate. It is characterized by:

[0009] In the gas stove of the present invention, a generally rectangular top plate is placed on a stove case, with the top of the stove burner protruding from a burner opening formed in the top plate. The top of the stove burner protruding from the burner opening has multiple flame ports formed on the outer peripheral side, allowing the fuel gas flowing out from the flame ports to be burned. The top plate is attached to the stove case at its peripheral edge, and the portion inside the peripheral edge (the inner portion of the top plate) has multiple downwardly convex valleys or upwardly convex peaks formed along the length of the top plate.

[0010] When fuel gas is burned on a stove burner, the radiant heat from the combustion flame heats the top plate, causing it to expand. However, the stove case supporting the periphery of the top plate is less affected by radiant heat than the top plate. Therefore, the top plate thermally expands while its periphery is attached to the stove case, which is less affected by the heat. The inside of the top plate deforms to accommodate the thermal expansion. Forming multiple valleys or peaks along the length of the top plate allows the valleys to become deeper and the peaks to become higher, dispersing and absorbing the thermal expansion across the multiple valleys or peaks. This prevents large deformation in specific areas of the top plate, effectively minimizing problems caused by top plate deformation.

[0011] In the gas stove of the present invention described above, the inside portion of the top plate may be formed with more valleys than peaks.

[0012] When the top plate thermally expands, the valleys of the top plate deform in a manner that the valleys become deeper, and the peaks deform in a manner that the peaks become higher. Therefore, if more valleys than peaks are formed, the top plate as a whole will deform into a downward convex shape. And if the top plate as a whole deforms into a downward convex shape, even if a stove burner is mounted at the peak, it is possible to prevent the top plate from deforming in a direction that makes the stove burner higher at the mounted position. This makes it possible to prevent the top plate from rising at the mounted portion of the stove burner, which would deteriorate the combustion condition of the stove burner.

[0013] Furthermore, in the gas stove of the present invention described above, either a valley portion or a ridge portion may be formed at the location on the top plate where the trivet is placed, so that the trivet on the top plate is placed across the valley portion or the ridge portion.

[0014] If the trivet placed on the top plate is designed to straddle the valleys or peaks, it is possible to prevent the trivet from tilting too much even if the top plate is deformed due to thermal expansion. This makes it possible to prevent problems such as the trivet tilting too much relative to the stove burner or rattling.

[0015] In addition, in the gas stove of the present invention described above, valley portions may be formed on both sides of the peak portions, and the height of the peak portions based on the peripheral portion of the top plate may be made smaller than the height of the valley portions based on the peripheral portion.

[0016] When the tabletop thermally expands, the portion where the peaks are formed deforms upward as a whole, and the portion where the valleys are formed deforms downward as a whole. However, if valleys are formed on both sides of the peaks, the base of the peaks will move downward due to the downward deformation of the valleys formed on both sides. Therefore, if the height of the peaks relative to the periphery of the tabletop is set to a value smaller than the depth of the valleys relative to the periphery, even if the peaks of the peaks become higher due to thermal expansion, this can be offset by the deformation of the valleys on both sides. As a result, it is possible to prevent the height of the peaks of the tabletop from changing before and after thermal expansion, and it is possible to prevent various problems associated with tabletop deformation. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing the external shape of a gas stove 10 of the present embodiment. [Figure 2] FIG. 1 is an exploded view showing the general structure of a gas stove 10. [Figure 3] 1 is an explanatory diagram showing the cross-sectional shape of a top plate 30 used in a conventional gas stove 90. FIG. [Figure 4] 10 is an explanatory diagram illustrating why the gas stove 10 of the present embodiment can suppress the deflection of the top plate. FIG. [Figure 5] FIG. 10 is an explanatory diagram of a gas stove 10 according to a first modified example. [Figure 6] FIG. 10 is an explanatory diagram of a gas stove 10 according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] A. This Example: Fig. 1 is a perspective view showing the external shape of a gas stove 10 of this embodiment. The gas stove 10 shown in Fig. 1 is a built-in type gas stove 10 that is fitted into the countertop of a system kitchen (not shown), and includes a box-shaped stove case 20 and a top plate 30 that is installed to cover the open top surface of the stove case 20.

[0019] Two burners 40 are mounted side by side inside the stove case 20, with the upper portion of each burner 40 protruding from a burner opening 30a (see FIG. 2) formed in the top plate 30. Multiple flame ports 40a are formed on the outer periphery of the upper portion of the burner 40 protruding from the burner opening 30a, allowing fuel gas to flow out from these flame ports 40a. A circular trivet 50 is mounted on the top plate 30, surrounding the upper portion of the burner 40 protruding from the top plate 30. Therefore, when a cooking vessel such as a pot is placed on the trivet 50, the fuel gas flowing out from the flame ports 40a can be ignited and burned, allowing the cooking vessel to be heated from below by the burner 40. Furthermore, an exhaust port cover 31 is attached to the top plate 30 behind the burner 40.

[0020] A grill door 21 is provided on the front of the gas stove 10, and a grill compartment 41 (see FIG. 2), which will be described later, is mounted behind the grill door 21, with a grill burner (not shown) mounted inside the grill compartment 41. Two stove operation buttons 22 are provided on the right side of the grill door 21, corresponding to the two stove burners 40, and the user of the gas stove 10 can ignite, extinguish, or adjust the flame power of the corresponding stove burner 40 by operating one of the stove operation buttons 22. A grill operation button 23 is provided on the left side of the grill door 21, and the user can ignite, extinguish, or adjust the flame power of the grill burner by operating the grill operation button 23.

[0021] 2 is an exploded view showing the general structure of the gas stove 10 of this embodiment. As shown in the figure, the stove case 20 is box-shaped with an open top, and the top end of the stove case 20 is bent outward to form a flange surface 24. The flange surface 24 is shaped like a rectangular frame, and fitting portions 25 for attaching the top plate 30 are formed at equal intervals at three locations on one side of the front side. In addition, mounting holes 26 for attaching the top plate 30 are formed at the left and right rear corners of the flange surface 24.

[0022] A grill compartment 41 is mounted in the center of the stove case 20, and stove burners 40 are mounted on the left and right sides of the grill compartment 41. A grill burner (not shown) is mounted inside the grill compartment 41, and food can be grilled by opening the grill door 21 and placing it inside the grill compartment 41. In addition, an exhaust passage 42 is mounted behind the grill compartment 41 (the far side in the drawing), and combustion exhaust and oily smoke generated during grilling are discharged from an open end 42a of the exhaust passage 42.

[0023] The top plate 30 is a rectangular plate-like member with two circular burner openings 30a formed side by side in the center, and rectangular exhaust ports 30b formed behind the two burner openings 30a. Three fitting portions (not shown) are attached at equal intervals to the front side of the back surface of the top plate 30, and mounting holes 32 are formed at the left and right rear corners. The top plate 30 does not necessarily have to be rectangular; for example, it may have a roughly rectangular shape with a curved front. The flange surface 24 also does not necessarily have to be rectangular; for example, it may have a roughly rectangular frame shape that matches the shape of the top plate 30.

[0024] With the top of the stove burner 40 inserted through the burner opening 30a, the top plate 30 is placed on the flange surface 24 by fitting the mating portion (not shown) on the rear front side of the top plate 30 into the mating portion 25 on the flange surface 24 of the stove case 20. Then, the mounting holes 32 on the top plate 30 are aligned with the mounting holes 26 on the flange surface 24, and the mounting screws 33 are inserted to attach the top plate 30 to the flange surface 24. This positions the exhaust port 30b on the top plate 30 directly above the opening end 42a of the exhaust passage 42. The exhaust port cover 31 is attached to the exhaust port 30b so as to cover the mounting screws 33. Furthermore, a trivet 50 is placed on the top plate 30 where the top of the stove burner 40 protrudes from the burner opening 30a of the top plate 30.

[0025] In this gas stove 10, when fuel gas is burned in the burner 40, the top plate 30 is heated by radiant heat from the flame, causing the top plate 30 to thermally expand. Meanwhile, the stove case 20 is less affected by radiant heat from the flame than the top plate 30, and therefore its thermal expansion is also less. Therefore, the top plate 30 deforms in a warping manner to absorb the thermal expansion. If the top plate 30 deforms in an upwardly convex shape, it rises relative to the top of the burner 40, which protrudes from the burner opening 30a of the top plate 30. As a result, the top plate 30 approaches too close to the flame opening 40a (see FIG. 1 ) formed on the outer peripheral side of the burner 40, making it difficult to supply sufficient air to the flame formed in the flame opening 40a, potentially worsening the combustion condition of the burner 40. Therefore, in conventional gas stoves, the portion inside the peripheral portion of the top plate 30 supported by the flange surface 24 of the stove case 20 is formed in a downwardly convex shape.

[0026] FIG. 3 is an explanatory diagram showing the cross-sectional shape of the top plate 30 used in a conventional gas stove 90. The cross-sectional direction is the longitudinal direction of the top plate 30 (here, the AA cross section shown in FIG. 2). Note that FIG. 3 does not show the stove burner 40 and grill chamber 41 mounted in the stove case 20, or the burner opening 30a of the top plate 30. Instead, the position where the stove burner 40 is mounted is shown with a thick dashed line, and the trivet 50 placed on the top plate 30 is shown with a dashed line. Furthermore, the thickness of the top plate 30 and the plate-like members forming the stove case 20 are shown thicker than they actually are compared to the sizes of the top plate 30 and the stove case 20.

[0027] FIG. 3(a) shows a state in which the temperature of the top plate 30 is low. As mentioned above, the peripheral portion 34 of the top plate 30 is supported by the flange surface 24 of the stove case 20, but the portion inside the peripheral portion 34 (hereinafter referred to as the inner portion 35) is slightly bent into a downward convex shape. In the example shown in FIG. 3(a), the portion of the top plate 30 that is bent into a downward convex shape (hereinafter referred to as the valley portion 30v) is lower by Dc0 than the peripheral portion 34 of the top plate 30. Note that in FIG. 3(a), the bending of the top plate 30 is shown in an exaggerated manner compared to the actual bending.

[0028] When fuel gas is burned using the stove burner 40 from this state, the top plate 30 is heated by radiant heat from the flame, causing thermal expansion. In contrast, the flange surface 24 of the stove case 20 does not thermally expand, so thermal expansion is suppressed at the peripheral portion 34 of the top plate 30. Therefore, the top plate 30 attempts to absorb the thermal expansion by deforming in a manner that increases the deflection of the valley portions 30v at the inner portion 35 of the top plate 30 (deepening the valleys of the valley portions 30v). Figure 3(b) shows a state in which the top plate 30 has deformed in a manner that deepens the valleys of the valley portions 30v in order to absorb the thermal expansion. In the example shown in Figure 3(b), the valley portions 30v of the top plate 30 are lower by Dh0 relative to the peripheral portion 34 of the top plate 30. Note that Figure 3(b) also shows the deformation of the top plate 30 in an exaggerated manner.

[0029] As is clear from a comparison of Figures 3(a) and 3(b), the depth of the valleys 30v of the top plate 30, based on the peripheral edge 34 of the top plate 30, increases from Dc0 before thermal expansion to Dh0 after thermal expansion. Furthermore, as the depth of the valleys 30v increases, the tilt of the top plate 30 at the position where the burner 40 is installed also increases. Furthermore, as the heating power of the burner 40 increases, the radiant heat of the combustion flame also increases, resulting in a greater deformation of the top plate 30 (here, the depth of the valleys 30v) and a greater tilt of the top plate 30 at the position where the burner 40 is installed. As a result, various problems can arise due to the deformation of the top plate 30, such as the back surface of the top plate 30 interfering with other components installed in the stove case 20 (e.g., the top surface of the grill chamber 41) or rattle of the trivet 50 on the top plate 30. Therefore, in order to suppress problems caused by deformation of the top plate 30, the gas stove 10 of this embodiment employs a top plate 30 having the following cross-sectional shape.

[0030] Fig. 4 is an explanatory diagram of the cross-sectional shape of the top plate 30 employed in the gas stove 10 of this embodiment. The cross-sectional direction is the longitudinal direction of the top plate 30 (here, the AA cross section shown in Fig. 2), as in Fig. 3 described above. Also in Fig. 4, the stove burner 40 and grill chamber 41 mounted in the stove case 20, and the burner opening 30a of the top plate 30 are not shown. Furthermore, the plate thickness of the top plate 30 and the plate thickness of the plate-like members forming the stove case 20 are shown thicker than they actually are.

[0031] FIG. 4(a) shows the top plate 30 of this embodiment in a low temperature state. As shown in the figure, the cross-sectional shape of the top plate 30 of this embodiment has two valley portions 30v formed therein, with an upwardly convex portion formed therebetween. Hereinafter, the upwardly convex portion of the top plate 30 will be referred to as a peak portion 30m. In the example shown in FIG. 4(a), the valley portions 30v of the top plate 30 are lower than the peripheral portion 34 of the top plate 30 by Dc1. Note that in FIG. 4(a), for convenience of explanation, the value of Dc1 is set to the same value as Dc0 shown in FIG. 3(a). Furthermore, the peak portions 30m of the top plate 30 are higher than the peripheral portion 34 by Uc1. As described above with reference to Figure 1, the gas stove 10 is equipped with two burners 40, one on the left and one on the right, so the position of the valley 30v of the top plate 30 is near the position where the burners 40 are installed. In Figure 4(a), the trivet 50 placed on the top plate 30 is shown by a dashed line.

[0032] FIG. 4(b) shows the state in which the top plate 30 of this embodiment is heated and thermally expanded. Comparing FIG. 4(a) and FIG. 4(b) makes clear that the general shape of the top plate 30 (the shape in which the peak portion 30m exists between the two valley portions 30v) remains unchanged even when the top plate 30 is thermally expanded, but the deflection of the top plate 30 increases to accommodate the thermal expansion. For example, focusing on the valley portions 30v of the top plate 30, before thermal expansion as shown in FIG. 4(a), the depth of the valley portions 30v relative to the peripheral portion 34 is Dc1. However, after thermal expansion as shown in FIG. 4(b), the depth of the valley portions 30v relative to the peripheral portion 34 increases to Dh1, and the valleys of the valley portions 30v become deeper (and therefore the deflection of the valley portions 30v becomes greater).

[0033] Furthermore, when focusing on the difference in height between the valleys 30v and the peaks 30m, before thermal expansion as shown in Figure 4(a), the depth of the valleys 30v relative to the peripheral edge 34 is Dc1, and the height of the peaks 30m relative to the peripheral edge 34 is Uc1, so the difference in height between the valleys 30v and the peaks 30m is Dc1 + Uc1. In contrast, after thermal expansion as shown in Figure 4(b), the depth of the valleys 30v relative to the peripheral edge 34 is Dh1, and the height of the peaks 30m relative to the peripheral edge 34 is Uh1, so the difference in height between the valleys 30v and the peaks 30m is Dh1 + Uh1. As is clear from a comparison of Figures 4(a) and 4(b), Dh1 + Uh1 is greater than Dc1 + Uc1, and therefore the deflection due to thermal expansion also increases between the valleys 30v and the peaks 30m.

[0034] However, compared to the table top 30 of the conventional technology described above with reference to Fig. 3, the table top 30 of this embodiment has less deformation due to thermal expansion. That is, comparing Fig. 3(b) with Fig. 4(b), in this embodiment shown in Fig. 4(b), the depth Dh1 of the valleys 30v, based on the peripheral edge portion 34, is smaller than the depth Dh0 of the valleys 30v, based on the peripheral edge portion 34, in the conventional technology shown in Fig. 3(b). As described above, the depth of the valleys 30v relative to the peripheral edge portion 34 before thermal expansion is the same in the conventional technology shown in Fig. 3(a) and this embodiment shown in Fig. 4(a). Therefore, the smaller depth of the valleys 30v after thermal expansion in this embodiment compared to the conventional technology indicates that deformation of the table top 30 due to thermal expansion is smaller. In addition, the reason why the deformation of the top plate 30 due to thermal expansion is reduced in this embodiment is thought to be that, while the top plate 30 of the conventional technology shown in Figure 3 absorbs thermal expansion at one valley portion 30v, the top plate 30 of this embodiment shown in Figure 4 can absorb thermal expansion in a distributed manner at three locations: two valley portions 30v and one peak portion 30m.

[0035] In this way, the table top 30 of this embodiment can disperse and absorb thermal expansion, thereby reducing deformation that occurs in the table top 30. This makes it possible to suppress various problems caused by deformation of the table top 30.

[0036] 4, in the top plate 30 of this embodiment, the position of the valley portion 30v is formed near the mounting position of the stove burner 40. Therefore, the trivet 50 of the gas stove 10 is placed on the top plate 30 in a state straddling the valley portion 30v, and even if the top plate 30 is deformed due to thermal expansion, it is possible to prevent the trivet 50 from tilting relative to the stove burner 40 or causing rattling due to the tilting of the trivet 50.

[0037] In addition, in the top plate 30 of this embodiment, the ridge portion 30m is formed between the two valley portions 30v, so even if the top plate 30 is deformed due to thermal expansion, the ridge portion 30m does not deform significantly downward. This makes it possible to prevent the back surface of the ridge portion 30m from interfering with other components (such as the grill chamber 41) installed in the stove case 20.

[0038] Furthermore, focusing on the height of the peaks 30m relative to the peripheral portion 34 of the tabletop 30, comparing FIG. 4(a) before thermal expansion with FIG. 4(b) after thermal expansion, we see that in the tabletop 30 of this embodiment, the height of the peaks 30m from the peripheral portion 34 is reduced due to thermal expansion. This is because the valleys 30v on both sides of the peaks 30m move downward due to deformation caused by thermal expansion, which in turn causes the peaks 30m to move downward. Therefore, as illustrated in FIG. 4(a), by setting the peaks 30m before thermal expansion slightly higher than the peripheral portion 34 (for example, by setting the absolute value of the height Uc1 of the peaks 30m relative to the peripheral portion 34 to a value smaller than the absolute value of the depth Dc1 of the valleys 30v relative to the peripheral portion 34), the peaks 30m can be made to be approximately the same height as the peripheral portion 34 after thermal expansion. As a result, the tabletop 30 can be prevented from deforming substantially before and after thermal expansion near the peaks 30m. Therefore, for example, in a gas stove 10 equipped with a third burner 40 at the rear position between two other burners 40, it is possible to prevent the combustion condition of the third burner 40 from deteriorating due to thermal expansion of the top plate 30, the trivet 50 from tilting significantly relative to the burner 40, or the trivet 50 from wobbling.

[0039] 4, two valleys 30v and one peak 30m are formed in the inner portion 35 of the top plate 30, but more valleys 30v and peaks 30m may be formed. For example, three valleys 30v may be formed, and one peak 30m may be formed between each of the valleys 30v (two in total).

[0040] B. First variant: In the gas stove 10 of the present embodiment described above, it has been explained that the inner portion 35 of the top plate 30 has more ridges 30m than valleys 30v. However, the number of ridges 30m does not necessarily have to be less than the number of valleys 30v, and more ridges 30m than valleys 30v may be formed.

[0041] FIG. 5 is an explanatory diagram of a gas stove 10 of a first modified example in which more ridges 30m than valleys 30v are formed. FIG. 5(a) shows the state of the top plate 30 before thermal expansion. In the gas stove 10 of the first modified example shown in FIG. 5(a), the two ridges 30m formed on the inner portion 35 of the top plate 30 have a ridge height Uc2 based on the peripheral portion 34, and the valley 30v formed between the two ridges 30m has a valley depth Dc2 based on the peripheral portion 34. Note that the height Uc2 of the ridges 30m based on the peripheral portion 34 is smaller than the depth Dc2 of the valleys 30v based on the peripheral portion 34.

[0042] FIG. 5(b) shows the state of the gas stove 10 of the first modified example after thermal expansion. Even in the gas stove 10 of the first modified example, the general shape of the top plate 30 does not change before and after thermal expansion. That is, in the example shown in FIG. 5, the shape of the top plate 30, with the valleys 30v between the two peaks 30m, remains unchanged. However, in order to absorb the thermal expansion of the top plate 30, the deflection of the top plate 30 increases after thermal expansion. For example, the height of the peaks 30m relative to the peripheral edge 34 of the top plate 30 increases from Uc2 before thermal expansion to Uh2 after thermal expansion, and the depth of the valleys 30v relative to the peripheral edge 34 increases from Dc2 before thermal expansion to Dh2 after thermal expansion.

[0043] However, compared to the table top 30 of the conventional technology described above with reference to FIG. 3, the table top 30 of the first modified example also experiences less deformation due to thermal expansion. That is, in the conventional technology illustrated in FIG. 3, the depth of the valleys 30v, measured from the peripheral edge portion 34, increases from Dc0 to Dh0 before and after thermal expansion, whereas in the first modified example illustrated in FIG. 5, the depth of the valleys 30v, measured from the peripheral edge portion 34, increases from Dc2 to Dh2 before and after thermal expansion. Therefore, when comparing the increase in the depth of the valleys 30v, the increase in the first modified example (= Dh2 - Dc2) is smaller than the increase in the conventional technology (= Dh0 - Dc0), and the table top 30 experiences less deformation due to bending. The reason for this is thought to be that, in the first modified example, the thermal expansion of the table top 30 is dispersed and absorbed at three locations: two peaks 30m and one valley 30v.

[0044] Furthermore, in the top plate 30 of the first modified example, a valley portion 30v is formed between two peak portions 30m. Therefore, even if the top plate 30 is deformed so that the valley of the valley portion 30v becomes deeper due to thermal expansion of the top plate 30, the peak portions 30m on both sides are deformed so that the peaks become higher, so the valley portion 30v does not deform downward significantly. Therefore, it is possible to prevent the back surface of the valley portion 30v formed in the center portion of the top plate 30 from interfering with other components (such as the grill chamber 41) installed in the stove case 20.

[0045] As shown in FIG. 5, in the top plate 30 of the first modification, the ridges 30m are positioned near the mounting position of the stove burner 40. Therefore, the trivet 50 of the gas stove 10 is placed on the top plate 30 straddling the ridges 30m. Even if the top plate 30 deforms due to thermal expansion, the trivet 50 is prevented from tilting relative to the stove burner 40 or from tilting and causing rattle. Additionally, in the top plate 30 of the first modification, when the top plate 30 thermally expands, the valleys 30v between the two ridges 30m deform downward, thereby preventing upward deformation of the ridges 30m. Therefore, even when the stove burner 40 is mounted near the ridges 30m, upward deformation can be prevented, thereby preventing deterioration of the stove burner's combustion condition.

[0046] 5, two peaks 30m and one valley 30v are formed on the inner portion 35 of the top plate 30, but more peaks 30m and valleys 30v may be formed. For example, three peaks 30m may be formed, with one valley 30v between each peak 30m (two in total).

[0047] C. Second Variant: In the gas stove 10 of the present embodiment and the first modified example described above, the number of valleys 30v and the number of ridges 30m formed on the inner portion 35 of the top plate 30 are different from each other. However, the same number of valleys 30v and ridges 30m may be formed.

[0048] FIG. 6 is an explanatory diagram illustrating a gas stove 10 of a second modified example in which one valley 30v and one ridge 30m are formed on the inner portion 35 of the top plate 30. FIG. 6(a) shows the state of the top plate 30 before thermal expansion, and FIG. 6(b) shows the state after thermal expansion. In the gas stove 10 of the second modified example illustrated in FIG. 6(a), the depth of the valley 30v relative to the peripheral portion 34 of the top plate 30 is Dc3, and the height of the ridge relative to the peripheral portion 34 is Uc3. Note that in the example shown in FIG. 6, the depth Dc3 of the valley 30v and the height Uc3 of the ridge 30m are the same value, but the height Uc3 of the ridge 30m may be smaller than the depth Dc3 of the valley 30v.

[0049] FIG. 6(b) shows the state of the gas stove 10 of the second modified example after thermal expansion. In the gas stove 10 of the second modified example, the general shape of the top plate 30 does not change before and after thermal expansion. However, in order to absorb the thermal expansion of the top plate 30, the deflection of the top plate 30 becomes larger after thermal expansion. For example, the depth of the valley portions 30v, measured from the peripheral portion 34 of the top plate 30, increases from Dc3 before thermal expansion to Dh3 after thermal expansion, and the height of the peak portions 30m, measured from the peripheral portion 34, increases from Uc3 before thermal expansion to Uh3 after thermal expansion.

[0050] However, compared to the table top 30 of the conventional technology described above with reference to FIG. 3, the table top 30 of the second modified example also experiences less deformation due to thermal expansion. That is, in the conventional technology illustrated in FIG. 3, the depth of the valleys 30v relative to the peripheral edge portion 34 increases from Dc0 to Dh0 before and after thermal expansion, whereas in the second modified example illustrated in FIG. 6, the depth of the valleys 30v relative to the peripheral edge portion 34 increases from Dc3 to Dh3 before and after thermal expansion. Therefore, when comparing the increase in the depth of the valleys 30v, the increase in the second modified example (= Dh3 - Dc3) is smaller than the increase in the conventional technology (= Dh0 - Dc0), and the table top 30 experiences less deformation due to bending. The reason for this is thought to be that, in the second modified example, the thermal expansion of the table top 30 is dispersed and absorbed at two locations: the valleys 30v and the peaks 30m.

[0051] 6, in the top plate 30 of the second modification, the positions of the valleys 30v and the peaks 30m are formed near the mounting position of the stove burner 40. Therefore, the trivet 50 of the gas stove 10 is placed on the top plate 30 straddling the valleys 30v or peaks 30m, and even if the top plate 30 deforms due to thermal expansion, it is possible to prevent the trivet 50 from tilting relative to the stove burner 40 or causing rattling due to the trivet 50 tilting.

[0052] 6, one valley portion 30v and one peak portion 30m are formed on the inner portion 35 of the top plate 30, but more peak portions 30m and valley portions 30v may be formed. For example, two valley portions 30v and two peak portions 30m may be formed so that the valley portions 30v and the peak portions 30m alternate with each other.

[0053] The above describes the gas stove 10 of this embodiment and various modified examples, but the present invention is not limited to the above embodiments and modified examples, and can be implemented in various forms within the scope of its gist.

[0054] For example, as described above with reference to Figures 4 to 6, in the gas stove 10 of this embodiment and the modified example, the ridges 30m of the top plate 30 are described as being higher than the peripheral edge portion 34. However, it is sufficient that the ridges 30m are higher than the valleys 30v, and they may be lower than the peripheral edge portion 34. [Explanation of symbols]

[0055] 10...Gas stove, 20...Stove case, 21...Grill door, 22...Stove operation button, 23...Grill operation button, 24...Flange surface, 25... fitting portion, 26... mounting hole, 30... top plate, 30a... burner opening, 30b...exhaust port, 30m...ridge portion, 30v...valley portion, 31...exhaust port cover, 32...mounting hole, 33...mounting screw, 34...periphery portion, 35...inner portion, 40... stove burner, 40a... flame port, 41... grill chamber, 42... exhaust passage, 42a...open end, 50...trivet, 90...gas stove.

Claims

1. A box-shaped stove case with an open top, A substantially rectangular top plate attached in a state of covering the top surface of the stove case; A stove burner is mounted on the stove case with its upper portion protruding from a burner opening formed in the top plate, and has a plurality of flame ports formed on the outer peripheral side surface of the upper portion protruding from the burner opening, and burns the fuel gas by letting the fuel gas flow out from the plurality of flame ports; a trivet placed on the top plate while surrounding an upper portion of the stove burner protruding from the burner opening; In a gas stove equipped with The top plate is attached to the stove case at a peripheral portion of the top plate, On the top plate, in a portion inside the peripheral edge portion, valley portions where the top plate is bent in a downward convex shape or peak portions where the top plate is bent in an upward convex shape are formed at a plurality of locations along the longitudinal direction of the top plate. A gas stove characterized by:

2. The gas stove according to claim 1, The inner portion of the top plate has more valleys than peaks. A gas stove characterized by:

3. The gas stove according to claim 1, The top plate has either the valley portion or the ridge portion formed at a location where the trivet is placed, The trivet is placed on the top plate in a state in which it straddles the valley portion or the peak portion. A gas stove characterized by:

4. The gas stove according to any one of claims 1 to 3, The valley portions are formed on both sides of the peak portions, The height of the peaks relative to the peripheral edge of the top plate is smaller than the height of the valleys relative to the peripheral edge. A gas stove characterized by:

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