Shell structure and gas water heater

Abstract

The utility model belongs to the technical field of household appliances, and particularly discloses a shell structure and a gas water heater, the shell structure comprises a bottom shell and a silencing assembly, and vent holes are formed in the bottom shell; the silencing assembly is arranged outside the bottom shell and comprises a back plate, a support and silencing cotton clamped between the back plate and the support, a ventilation channel is formed between the back plate and the bottom shell, the ventilation channel is communicated with the ventilation hole, the support and the silencing cotton are both located in the ventilation channel, a limiting part is arranged on the side, facing the bottom shell, of the support, and the limiting part abuts against the bottom shell. According to the shell structure provided by the utility model, the bracket abuts against the bottom shell through the limiting part so as to prevent the bracket and the silencing cotton from arching towards the bottom shell, so that the ventilating duct is ensured to have a good ventilating effect all the time, and the ventilating duct with the good ventilating effect has a relatively low noise level.

Description

TECHNICAL FIELD

[0001] The utility model relates to domestic appliance technical field especially relates to a shell structure and gas water heater. BACKGROUND

[0002] The gas water heater passes through the heating mode of burning, and heat is transferred to the cold water flowing through the heat exchanger to achieve the purpose of preparing hot water. In order to make the user have good use experience, the gas water heater usually adopts the sound-absorbing cotton to realize the effect of noise reduction and silence.

[0003] In the related art, the sound-absorbing cotton is usually arranged between the bottom shell and the back plate of the gas water heater, and the sound-absorbing cotton is usually clamped between the support and the back plate by the screw fastening mode. In the use process of the gas water heater, the support and the sound-absorbing cotton may be arched towards the bottom shell, which affects the ventilation effect of the ventilation passage formed between the back plate and the bottom shell. SUMMARY

[0004] One of the technical problems solved by the utility model is to provide a shell structure which can effectively solve the problem that the support and the sound-absorbing cotton are arched towards the bottom shell.

[0005] The above technical problem is solved by the following technical scheme:

[0006] A shell structure comprises:

[0007] A bottom shell is provided with a ventilation hole;

[0008] A sound-absorbing assembly is arranged outside the bottom shell, and the sound-absorbing assembly comprises a back plate, a support and sound-absorbing cotton clamped between the back plate and the support. A ventilation passage is formed between the back plate and the bottom shell, and the ventilation passage is in communication with the ventilation hole. The support and the sound-absorbing cotton are both located in the ventilation passage, and a limiting portion is arranged on the side of the support facing the bottom shell, and the limiting portion abuts against the bottom shell.

[0009] Compared with the background technology, the shell structure has the beneficial effects that:

[0010] The support abuts against the bottom shell through the limiting portion to prevent the support and the sound-absorbing cotton from being arched towards the bottom shell, thereby ensuring that the ventilation passage always has a good ventilation effect, and the ventilation passage with a good ventilation effect has a low noise level. In addition, the support abuts against the bottom shell through the limiting portion, so that the sound-absorbing cotton is stably clamped between the back plate and the support, the sound-absorbing cotton and the back plate are tightly attached, and the sound-absorbing cotton has a good noise reduction and silence effect.

[0011] In one of the embodiments, a plurality of noise reduction holes are arranged on the support, and the edges of at least part of the noise reduction holes are provided with the limiting portion.

[0012] In one of the embodiments, the support frame comprises a rectangular frame, a plurality of vertical slats and a plurality of horizontal slats are arranged in the rectangular frame in a staggered manner, and a plurality of noise reduction holes are formed between the rectangular frame, the vertical slats and the horizontal slats, and the limiting portions are arranged on the vertical slats and / or the horizontal slats.

[0013] In one of the embodiments, the limiting portions are arranged as flanges, and at least one of the two long sides of the vertical slats is provided with the limiting portions.

[0014] In one of the embodiments, the vertical slats comprise two first vertical slats and at least one second vertical slat arranged between the two first vertical slats.

[0015] In one of the embodiments, the two first vertical slats are provided with the limiting portions on the sides away from each other, and / or the second vertical slat is provided with a plurality of pairs of limiting portions at intervals along the length direction thereof.

[0016] In one of the embodiments, the back plate is provided with a first supporting protrusion, and the first supporting protrusion abuts against the sound-absorbing cotton.

[0017] In one of the embodiments, the support frame is provided with a second supporting protrusion, and the second supporting protrusion abuts against the sound-absorbing cotton.

[0018] In one of the embodiments, the support frame is provided with a supporting leg on each of the two sides in the width direction thereof, and the supporting leg is clamped between the bottom shell and the back plate.

[0019] In one of the embodiments, the length direction of the support frame is arranged as a vertical direction, and the lower edge of the support frame is provided with a positioning flange, and a limiting fit along the length direction of the support frame is formed between the positioning flange and the sound-absorbing cotton.

[0020] In one of the embodiments, the support frame is provided with two first fixing holes, and the two first fixing holes are arranged on the two sides of the support frame in the length direction thereof, respectively, and the back plate is provided with two second fixing holes.

[0021] The shell structure further comprises two first fasteners, the first fasteners, the first fixing holes and the second fixing holes are arranged one by one in correspondence, and the first fasteners are arranged in the corresponding first fixing holes and are threadedly connected with the corresponding second fixing holes.

[0022] The second technical problem to be solved by the utility model is to provide a gas water heater which can effectively solve the problem that the support frame and the sound-absorbing cotton are arched towards the bottom shell.

[0023] The above technical problems are solved by the following technical solutions.

[0024] The gas water heater comprises the shell structure.

[0025] The gas water heater has the beneficial effects that, compared with the background art:

[0026] The support of the shell structure is abutted with the bottom shell through the limiting part, so as to prevent the support and the sound-absorbing cotton from being arched towards the bottom shell, thereby ensuring that the ventilation channel always has a good ventilation effect, and at the same time of noise reduction and silence, it can ensure that the gas water heater has sufficient oxygen supply in the running process, avoid incomplete combustion caused by oxygen deficiency, thereby reducing the generation of carbon monoxide, improving the thermal efficiency, reducing energy waste, ensuring the safety of the user, and prolonging the service life of the water heater. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure schematic view of the gas water heater is provided for the utility model;

[0028] Figure 2 A structure schematic view of the sound-absorbing assembly is provided for the utility model;

[0029] Figure 3 A partial sectional view of the sound-absorbing assembly is provided for the utility model;

[0030] Figure 4 An explosion view of the sound-absorbing assembly is provided for the utility model;

[0031] Figure 5 A structure schematic view of the support from one perspective is provided for the utility model;

[0032] Figure 6 Another structure schematic view of the support is provided for the utility model;

[0033] Figure 7 A structure schematic view of the back plate is provided for the utility model.

[0034] Label explanation:

[0035] 100, bottom shell; 110, bottom plate; 111, ventilation hole;

[0036] 200, back plate; 201, ventilation channel; 202, ventilation opening; 210, first support protrusion; 211, first protruding strip; 212, second protruding strip; 220, positioning groove; 230, second fixing hole; 240, third fixing hole;

[0037] 300, support; 310, limiting part; 311, first flange; 312, second flange; 313, third flange; 320, rectangular frame; 321, vertical strip plate; 3211, first vertical strip plate; 3212, second vertical strip plate; 322, horizontal strip plate; 323, noise reduction hole; 330, positioning flange; 340, reinforcing flange; 350, diagonal plate; 360, second supporting protrusion; 370, supporting leg; 380, first fixing hole;

[0038] 400, sound-absorbing cotton;

[0039] 500, first fastener;

[0040] 600, second fastener. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0043] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] Refer toFigures 1 to 4 As shown, this embodiment provides a shell structure, which includes a bottom shell 100 and a noise reduction component.

[0046] Specifically, the bottom shell 100 is provided with ventilation holes 111; the sound-absorbing component is located outside the bottom shell 100. The sound-absorbing component includes a back plate 200, a bracket 300, and sound-absorbing cotton 400 sandwiched between the back plate 200 and the bracket 300. A ventilation channel 201 is formed between the back plate 200 and the bottom shell 100. The ventilation channel 201 is connected to the ventilation holes 111. The bracket 300 and the sound-absorbing cotton 400 are both located inside the ventilation channel 201. A limiting part 310 is provided on the side of the bracket 300 facing the bottom shell 100. The limiting part 310 abuts against the bottom shell 100.

[0047] In this embodiment, the bracket 300 abuts against the bottom shell 100 via the limiting part 310 to prevent the bracket 300 and the sound-absorbing cotton 400 from arching towards the bottom shell 100, thereby ensuring that the ventilation duct 201 always has a good ventilation effect, and the ventilation duct 201 with a good ventilation effect has a low noise level. In addition, the bracket 300 abutting against the bottom shell 100 via the limiting part 310 can stably clamp the sound-absorbing cotton 400 between the back plate 200 and the bracket 300, so that the sound-absorbing cotton 400 and the back plate 200 fit tightly together, which has a good noise reduction and silencing effect.

[0048] For example, the bottom shell 100 includes a bottom plate 110, ventilation holes 111 are provided on the bottom plate 110, and a ventilation channel 201 is formed between the back plate 200 and the bottom plate 110. In this embodiment, the limiting part 310 abuts against the bottom plate 110.

[0049] For example, the base plate 110 may be provided with a plurality of ventilation holes 111, which may be arranged in a matrix to ensure that the gas water heater with shell structure has sufficient oxygen supply during operation.

[0050] In one feasible implementation, such as Figures 4 to 6 As shown, the bracket 300 is provided with a positioning flange 330, and the positioning flange 330 and the sound-absorbing cotton 400 form a limiting fit along the length direction of the bracket 300 to realize the positioning assembly of the sound-absorbing cotton 400.

[0051] For example, the length direction of the bracket 300 is set to the vertical direction, and the lower edge of the bracket 300 is provided with a positioning flange 330.

[0052] In one feasible implementation, such as Figures 4 to 6 As shown, the upper edge of the bracket 300 and both sides along the width direction of the bracket 300 are provided with reinforcing flanges 340 that bend towards the bottom shell 100 to enhance the structural strength of the bracket 300. The reinforcing flanges 340 can be connected as a single unit.

[0053] In the embodiment, as shown in Figure 3 , Figure 5 and Figure 6 , the support 300 is provided with a plurality of limiting portions 310 on one side of the support 300 facing the bottom shell 100, which can prevent the support 300 and the sound-absorbing cotton 400 from being arched towards the bottom shell 100.

[0054] Specifically, the support 300 is provided with a plurality of noise reduction holes 323, and the edges of at least part of the noise reduction holes 323 are provided with the limiting portions 310. In the embodiment, the noise can act on the sound-absorbing cotton 400 through the noise reduction holes 323, so as to achieve a good noise reduction effect.

[0055] In the embodiment, as shown in Figure 5 and Figure 6 , the support 300 comprises a rectangular frame 320, a plurality of vertical strip plates 321 and a plurality of horizontal strip plates 322 are arranged in a horizontal and vertical staggered manner in the rectangular frame 320, and a plurality of noise reduction holes 323 are formed between the rectangular frame 320, the vertical strip plates 321 and the horizontal strip plates 322, and the limiting portions 310 are arranged on the vertical strip plates 321 and / or the horizontal strip plates 322. In the embodiment, the horizontal and vertical staggered arrangement of the plurality of vertical strip plates 321 and the plurality of horizontal strip plates 322 can make the support 300 have good structural strength, so as to stably clamp the sound-absorbing cotton 400 between the back plate 200 and the support 300. In addition, the horizontal and vertical staggered arrangement of the plurality of vertical strip plates 321 and the plurality of horizontal strip plates 322 facilitates the arrangement of the limiting portions 310, so as to prevent the support 300 and the sound-absorbing cotton 400 from being arched towards the bottom shell 100.

[0056] Of course, the plurality of vertical strip plates 321 and the plurality of horizontal strip plates 322 can also be replaced by strip plates staggered in other directions, which are not limited in the embodiment.

[0057] In some embodiments, the limiting portions 310 are arranged as flanges, and at least one of the two long sides of the vertical strip plates 321 is provided with the limiting portions 310. Wherein, the length direction of the support 300, i.e. the length direction of the vertical strip plates 321 is the same as the direction of the air vent 202 of the ventilation channel 201. In the embodiment, the limiting portions 310 can be formed by extending and bending the long sides of the vertical strip plates 321, which facilitates the forming and manufacturing of the support 300, and the limiting portions 310 will not block the gas flow in the ventilation channel 201, so that the ventilation channel 201 has a good ventilation effect.

[0058] Of course, the limiting portions 310 can also be in the form of columns or blocks, which are not limited in the embodiment.

[0059] For example, the limiting portions 310 are arranged on at least part of the vertical strip plates 321.

[0060] In one feasible implementation, at least a portion of the noise reduction hole 323 is provided with a diagonal plate 350 to further enhance the structural strength of the bracket 300.

[0061] For example, the noise reduction holes 323 between the two horizontal strips 322 closest to the upper edge of the bracket 300 are provided with diagonal plates 350, and the two adjacent diagonal plates 350 are V-shaped.

[0062] In this embodiment, the vertical strip 321 includes two first vertical strips 3211 and at least one second vertical strip 3212 disposed between the two first vertical strips 3211.

[0063] For example, the vertical strip 321 includes a second vertical strip 3212, that is, the bracket 300 includes three vertical strips 321. While ensuring that the bracket 300 has good structural strength, the weight of the bracket 300 can be reduced, and the molding and manufacturing of the bracket 300 can be facilitated.

[0064] In some embodiments, a limiting portion 310 is provided on the side of the two first vertical strips 3211 that is far apart from each other, that is, the limiting portion 310 includes, for example, Figure 5 The first flange 311 shown effectively prevents the bracket 300 and the sound-absorbing cotton 400 from arching towards the bottom shell 100.

[0065] For example, the lengths of the first flanges 311 may be equal or unequal, and this embodiment does not limit them.

[0066] For example, the first vertical strip 3211 may be provided with a plurality of first flanges 311 at intervals along its length.

[0067] In some embodiments, the second vertical strip 3212 is provided with a plurality of pairs of limiting portions 310 spaced apart along its length, that is, the limiting portions 310 include, for example, Figure 5 The second flange 312 shown effectively prevents the bracket 300 and the sound-absorbing cotton 400 from arching towards the bottom shell 100. It is understood that each pair of limiting parts 310 includes two limiting parts 310 disposed opposite each other on both sides of the width direction of the second vertical strip 3212.

[0068] For example, the lengths of the second flanges 312 may be equal or unequal, and this embodiment does not limit them.

[0069] In one feasible implementation, the limiting part 310 includes both a first flange 311 and a second flange 312, which better prevents the bracket 300 and the sound-absorbing cotton 400 from arching towards the bottom shell 100. The lengths of the first flange 311 and the second flange 312 may be equal or unequal, and this embodiment does not impose any limitation.

[0070] In an embodiment, the two first vertical plates 3211 can be provided with a limiting part 310 on the side close to each other, i.e. the limiting part 310 comprises a third flange 313 as shown in Figure 5 which can prevent the bracket 300 and the sound-absorbing cotton 400 from being arched towards the bottom shell 100, and the effect is better.

[0071] In some embodiments, the third flange 313 is provided with one and is arranged opposite to the first flange 311 closest to the positioning flange 330 along the width direction of the first vertical plate 3211. In this embodiment, the distance L1 between the third flange 313 and the positioning flange 330 is smaller than the distance L2 between the second flange 312 closest to the positioning flange 330 and the positioning flange 330, so that the limiting part 310 can provide good support to the bracket 300, effectively reduce the deformation amount of the bracket 300 caused by clamping the sound-absorbing cotton 400, and make the ventilation channel 201 have a good ventilation effect.

[0072] In some embodiments, the first vertical plate 3211 can be provided with a plurality of third flanges 313 along the length direction thereof, so as to further reduce the deformation amount of the first vertical plate 3211 caused by clamping the sound-absorbing cotton 400. The third flange 313 can be arranged one by one corresponding to the first flange 311.

[0073] For example, the length of the third flange 313 can be equal to or different from that of the corresponding first flange 311, which is not limited in the present embodiment.

[0074] In the present embodiment, as shown in Figure 7 , the back plate 200 is provided with a first supporting protrusion 210, the first supporting protrusion 210 abuts against the sound-absorbing cotton 400, so that the sound-absorbing cotton 400 is stably clamped between the back plate 200 and the bracket 300, and the back plate 200 can be prevented from being deformed. The first supporting protrusion 210 has an outer concave and inner convex structure, which facilitates the molding and manufacturing of the back plate 200.

[0075] For example, the first supporting protrusion 210 comprises a plurality of first protrusions 211 arranged along the length direction of the back plate 200 and a plurality of second protrusions 212 intersecting with the first protrusions 211, the first protrusions 211 extend along the width direction of the back plate 200, and the second protrusions 212 extend along the length direction of the back plate 200, so that the sound-absorbing cotton 400 is stably clamped between the back plate 200 and the bracket 300.

[0076] In some embodiments, as shown in Figure 6As shown, the support frame 300 is provided with second support protrusions 360, which abut against the sound-absorbing cotton 400 to stably hold the sound-absorbing cotton 400 between the back plate 200 and the support frame 300, and prevent the support frame 300 from deforming. The second support protrusions 360 are concave on the outside and convex on the inside towards the air duct 201, facilitating the molding and manufacturing of the support frame 300.

[0077] Exemplarily, the second support protrusions 360 are in the shape of a cross, facilitating the molding and manufacturing of the support frame 300. In some embodiments, the second support protrusions 360 are arranged at the intersections of the horizontal strip plates 322 and the vertical strip plates 321 except for the horizontal strip plate 322 closest to the positioning flange 330, to stably hold the sound-absorbing cotton 400 between the back plate 200 and the support frame 300. Of course, the second support protrusions 360 can also be arranged at the intersections of the horizontal strip plate 322 closest to the positioning flange 330 and the vertical strip plates 321, which is not limited in the present embodiment.

[0078] In the present embodiment, referring to Figure 5 and Figure 7 As shown, the support frame 300 is provided with support feet 370 on both sides along the width direction, which are clamped between the bottom shell 100 and the back plate 200. The support feet 370 can provide a clamping force for the sound-absorbing cotton 400 to stably hold the sound-absorbing cotton 400 between the back plate 200 and the support frame 300.

[0079] Specifically, the support feet 370 are clamped between the bottom plate 110 and the back plate 200.

[0080] Exemplarily, the support feet 370 can be formed by extending and bending the reinforcing flange 340.

[0081] Exemplarily, the back plate 200 is provided with a plurality of support feet 370 on both sides along the width direction of the support frame 300.

[0082] Exemplarily, the back plate 200 is provided with positioning grooves 220 for accommodating the support feet 370, facilitating the positioning and assembly between the support frame 300 and the back plate 200, and effectively ensuring the air tightness of the air duct 201. The positioning grooves 220 are arranged one-to-one corresponding to the support feet 370.

[0083] In the present embodiment, referring to Figure 4 , Figure 5 and Figure 7As shown, the support 300 is provided with two first fixing holes 380, and the two first fixing holes 380 are respectively arranged on the two sides of the support 300 along the length direction of the support 300. The back plate 200 is provided with two second fixing holes 230. The shell structure further comprises two first fasteners 500, the first fastener 500, the first fixing hole 380 and the second fixing hole 230 are arranged one by one, and the first fastener 500 is arranged in the corresponding first fixing hole 380 and is threadedly connected with the corresponding second fixing hole 230. In the embodiment, in cooperation with the limiting part 310, the sound-absorbing assembly only needs two first fasteners 500 to stably clamp the sound-absorbing cotton 400 between the back plate 200 and the support 300, which facilitates the assembly of the sound-absorbing assembly, effectively improves the assembly efficiency of the sound-absorbing assembly, and reduces the labor cost. In addition, compared with the existing technology of fixing the sound-absorbing cotton 400 by the back adhesive, the cost is effectively reduced.

[0084] In the embodiment, referring to Figure 4 and Figure 7 As shown, the periphery of the back plate 200 is provided with a plurality of third fixing holes 240, and the bottom shell 100 is provided with a plurality of fourth fixing holes (not shown). The third fixing hole 240 and the fourth fixing hole are arranged one by one. The shell structure further comprises two second fasteners 600, the second fastener 600, the third fixing hole 240 and the fourth fixing hole are arranged one by one, the second fastener 600 is arranged in the corresponding third fixing hole 240 and is threadedly connected with the corresponding fourth fixing hole, which facilitates the fixation of the back plate 200 on the bottom shell 100.

[0085] Specifically, the fourth fixing hole is arranged on the bottom plate 110.

[0086] Exemplarily, the back plate 200 is provided with a plurality of third fixing holes 240, for example, three to five, on both sides along the width direction, so as to stably fix the back plate 200 on the bottom shell 100.

[0087] Referring to Figures 1 to 7 As shown, the embodiment further provides a gas water heater, which comprises the shell structure described above. The support 300 of the shell structure is abutted with the bottom shell 100 through the limiting part 310, so as to prevent the support 300 and the sound-absorbing cotton 400 from being arched towards the bottom shell 100, thereby ensuring that the ventilation channel 201 always has a good ventilation effect. While reducing noise and being quiet, it can ensure that the gas water heater has sufficient oxygen supply during operation, avoid incomplete combustion caused by oxygen deficiency, thereby reducing the generation of carbon monoxide, improving thermal efficiency, reducing energy waste, protecting the safety of users, and prolonging the service life of the water heater.

[0088] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and to make the description brief, all possible combinations of the foregoing technical features are not described, however, as long as the combinations of the technical features do not exist contradiction, it should be considered that it is within the scope of the description.

[0089] The specific contents of the foregoing specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it should not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A shell structure, characterized in that, include: A bottom shell (100) is provided with ventilation holes (111); A noise reduction assembly is disposed outside the bottom shell (100). The noise reduction assembly includes a back plate (200), a bracket (300), and noise reduction cotton (400) sandwiched between the back plate (200) and the bracket (300). A ventilation channel (201) is formed between the back plate (200) and the bottom shell (100). The ventilation channel (201) is connected to the ventilation hole (111). The bracket (300) and the noise reduction cotton (400) are both located in the ventilation channel (201). A limiting part (310) is provided on the side of the bracket (300) facing the bottom shell (100). The limiting part (310) abuts against the bottom shell (100).

2. The shell structure according to claim 1, characterized in that, The bracket (300) is provided with a plurality of noise reduction holes (323), and at least some of the noise reduction holes (323) are provided with the limiting part (310) at their edges.

3. The shell structure according to claim 2, characterized in that, The bracket (300) includes a rectangular frame (320), within which are arranged a plurality of vertical strips (321) and a plurality of horizontal strips (322) arranged in a crisscross pattern. A plurality of noise reduction holes (323) are formed between the rectangular frame (320), the vertical strips (321), and the horizontal strips (322). The limiting part (310) is provided on the vertical strips (321) and / or the horizontal strips (322).

4. The shell structure according to claim 3, characterized in that, The limiting part (310) is provided as a flange, and at least one of the two long sides of the vertical strip (321) is provided with the limiting part (310).

5. The shell structure according to claim 3, characterized in that, The vertical strip (321) includes two first vertical strips (3211) and at least one second vertical strip (3212) disposed between the two first vertical strips (3211); The limiting portion (310) is provided on the side of the two first vertical strips (3211) that are far apart from each other, and / or, the second vertical strip (3212) is provided with multiple pairs of the limiting portions (310) at intervals along its length.

6. The shell structure according to any one of claims 1-5, characterized in that, The back plate (200) is provided with a first support protrusion (210), which abuts against the sound-absorbing cotton (400); And / or, the bracket (300) is provided with a second support protrusion (360), which abuts against the sound-absorbing cotton (400).

7. The shell structure according to any one of claims 1-5, characterized in that, The bracket (300) has support feet (370) on both sides along its width direction, and the support feet (370) are sandwiched between the bottom shell (100) and the back plate (200).

8. The shell structure according to any one of claims 1-5, characterized in that, The length direction of the bracket (300) is set to the vertical direction, and the lower edge of the bracket (300) is provided with a positioning flange (330). The positioning flange (330) and the sound-absorbing cotton (400) form a limiting fit along the length direction of the bracket (300).

9. The shell structure according to any one of claims 1-5, characterized in that, The bracket (300) is provided with two first fixing holes (380), and the two first fixing holes (380) are respectively provided on both sides of the bracket (300) along its length direction. The back plate (200) is provided with two second fixing holes (230). The shell structure also includes two first fasteners (500), the first fasteners (500), the first fixing hole (380) and the second fixing hole (230) are provided in a one-to-one correspondence, the first fasteners (500) are inserted through the corresponding first fixing hole (380) and threadedly connected to the corresponding second fixing hole (230).

10. A gas water heater, characterized in that, Includes the shell structure as described in any one of claims 1-9.

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