CN219690105U

CN219690105U - Notch sealing structure of outer barrel of washing machine and washing machine

Info

Publication number: CN219690105U
Application number: CN202321326019.6U
Authority: CN
Inventors: 黄仁忠; 胡磊; 赵梦洁; 倪治明; 夏登枫; 陈伟; 张旭东; 郑军妹
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-09-15
Anticipated expiration: 2033-05-26

Abstract

A notch sealing structure of a washing machine outer barrel is characterized in that: the outer barrel is provided with a notch along at least one side of the width direction of the shell, and a side plate arranged on the notch through a flexible connecting piece is arranged on the notch; the flexible connecting piece is an annular sealing piece which is provided with corrugation folds and can be stretched, a convex ring is formed in the circumferential direction of the notch, one end of the flexible connecting piece is sleeved on the convex ring, and the edge of the flexible connecting piece is outwards turned and is also formed with a side sealing edge which can be connected with the side wall of the outer barrel; the inner side of the side plate is formed with a convex strip, and the other end of the flexible connecting piece is provided with a groove for embedding and fixing the convex strip. A washing machine employing the sealing structure is also disclosed. The utility model has the advantages that: the side plate seal is convenient to assemble and disassemble on one hand, and the strength of the notch end is improved on the other hand; the sealing structure of the notch is simple, the installation is easy, and the flexible connecting piece not only allows the outer barrel and the side plate to perform relative movement, but also plays a certain role in buffering.

Description

Notch sealing structure of outer barrel of washing machine and washing machine

Technical Field

The utility model relates to a sealing scheme, in particular to a notch sealing structure of an outer barrel of a washing machine and the washing machine adopting the same.

Background

In the prior art, in the washing stage of the drum washing machine, the larger the height difference formed by the inner drum is, the more powerful the clothes are beaten, and the better the washing effect is; in the dehydration stage, the larger the diameter of the inner cylinder is, the larger the centrifugal force generated by the clothes is, the better the dehydration effect is, and the lower the water content of the clothes is. However, when the drum type washing machine is operated, vibration is caused by a local excessive centrifugal force generated from the washing machine due to the high-speed rotation of the inner tub, a random shift phenomenon of the center of mass is inevitably caused, and the vibration caused by the inner tub is transmitted to the outside of the drum type washing machine through the outer tub and the cabinet; in order to prevent vibration from being transmitted from the inner cylinder to the casing through the outer cylinder, the existing drum washing machine needs to leave a gap between the inner cylinder and the outer cylinder and a gap between the outer cylinder and the casing, and a vibration-proof device for buffering and damping the vibration of the outer cylinder is arranged to ensure that the washing machine has sufficient space to shake and displace during high-speed rotation; therefore, under the condition of standard casing width (600 mm), the diameter of an inner cylinder of a main stream drum washing machine (such as a capacity of 10 kg) in the current market is about 500mm, and the main stream drum washing machine cannot be larger.

In order to enlarge the diameter of the inner cylinder, the outer cylinder is relatively fixed to reduce the gap between the outer cylinder and the casing, and although the diameter of the inner cylinder can be enlarged to a certain extent, the gap of about 25mm is reserved between the inner cylinder and the outer cylinder because the displacement of the vibration of the inner cylinder cannot be avoided, the diameter of the inner cylinder can only be about 520mm, and compared with the diameter of the inner cylinder of the conventional main stream product drum washing machine, the diameter of the inner cylinder is not obviously improved.

Therefore, the inventor of the present utility model applies for a washing machine outer tub and a drum washing machine using the same, wherein the outer tub is cut to form a notch, so that the size of the outer tub in the width direction of the casing can be enlarged to be equal to the width of the casing, and the size of the inner tub in the width direction of the casing can be effectively enlarged by enlarging the outer tub, so that the diameter of the inner tub can be maximally increased under the condition that the size of the casing of the washing machine is unchanged; however, how to seal the cut to ensure convenience in assembly and disassembly and reduce vibration transferred to the cabinet due to movement of the outer tub along with the inner tub is a problem that needs to be solved in the current washing machine.

Disclosure of Invention

The first technical problem to be solved by the present utility model is to provide a slit sealing structure of an outer tub of a washing machine, which has a better sealing effect and is convenient and simple to assemble, aiming at the state of the art.

A second technical problem to be solved by the present utility model is to provide a washing machine for tub operation using the above-mentioned slit sealing structure, aiming at the above-mentioned state of the art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the utility model provides a notch seal structure of washing machine outer bucket, washing machine outer bucket hold in the casing, its characterized in that: the outer barrel of the washing machine is provided with a notch along at least one side of the width direction of the shell, a side plate capable of sealing the notch is arranged on the notch, and the side plate is fixedly arranged on the notch through a flexible connecting piece; the flexible connecting piece is an annular sealing piece which is provided with corrugated folds and can be elastically stretched in the radial direction, a convex ring which extends outwards in the width direction of the shell is formed in the circumferential direction of the notch, one end of the flexible connecting piece is sleeved on the convex ring, and one end edge of the flexible connecting piece is outwards turned and formed with a side sealing edge which can be connected with the side wall of the outer barrel; the inner side of the side plate is provided with a raised line, and the other end of the flexible connecting piece is provided with a groove for embedding and fixing the raised line.

In order to better fix the side plates, preferably, the two ends of the side plates are respectively and outwardly extended to form connecting plates which can be fixedly connected with the shell of the washing machine.

For being convenient for realize the fixed connection of flexonics spare and outer bucket, improve simultaneously and connect the reliability, as the preference, the border of side seal border flexonics spare one end is perpendicularly outwards turned over to form the dog-ear of L shape between the border of side seal limit and flexonics spare one end, the cover is equipped with the annular first layering that can compress tightly the side seal limit on outer bucket lateral wall on this dog-ear, link to each other through this first layering is fixed between the lateral wall of outer bucket and the side seal limit of flexonics spare.

For convenient dismantlement and assembly, as a further preferred, the side seal edge is spaced apart to be equipped with first through-hole, correspondingly, the second through-hole has been seted up to the position that first layering corresponds first through-hole, and the outer bucket is provided with the third through-hole that corresponds the second through-hole along notched border, realize detachable the connection through passing first mounting of first through-hole, second through-hole and third through-hole between side seal edge, outer bucket and the first layering.

In order to increase the connection contact surface and improve the connection reliability, preferably, the raised strips are annularly arranged along the inner side of the side plate, and correspondingly, the grooves are annular grooves corresponding to the annular raised strips.

In order to further improve the connection strength, preferably, the other end of the flexible connecting piece is provided with an annular second pressing strip which can be buckled at the bottom of the groove on one side of the reverse side of the groove, and the other end of the flexible connecting piece is fixedly connected with the side plate through the second pressing strip.

For convenient assembly and disassembly, as a further preferable mode, the grooves are provided with fourth through holes at intervals along the circumferential direction, correspondingly, the second pressing strips are provided with fifth through holes at positions corresponding to the fourth through holes, the side plates are provided with sixth through holes at positions corresponding to the fourth through holes, and detachable connection is realized among the flexible connecting piece, the side plates and the second pressing strips through second fixing pieces penetrating through the fourth through holes, the fifth through holes and the sixth through holes.

In order to improve the strength of the side sealing edge, preferably, the side sealing edge is an N-shaped side sealing edge formed by continuously and perpendicularly folding three times along the edge of one end of the flexible connecting piece, any two adjacent edges of the N-shaped side sealing edge are perpendicular to each other, and the last folded edge of the N-shaped side sealing edge is fixedly connected with the outer barrel through an annular connecting piece.

In order to simplify the assembly structure and simultaneously ensure the strength and the stability of connection, as a further preferred mode, the annular connecting piece and the last section of the edge folding of the N-shaped side edge sealing are integrally formed through an encapsulation process, and the annular connecting piece and the outer barrel are fixed through welding.

In order to increase the contact area and improve the connection firmness, preferably, the raised strips are raised ribs annularly arranged along the inner side of the side plate, correspondingly, the grooves are annular clamping grooves which can be spliced with the raised ribs, and the raised ribs and the clamping grooves are integrally formed by adopting an encapsulation process.

In order to further improve the strength of the outer tub at the cutout and prevent deformation, it is preferable that the outer tub be further provided with reinforcing plates at upper and lower sides of the cutout in the height direction of the cabinet, respectively.

The utility model solves the second technical problem by adopting the technical proposal that: the utility model provides a washing machine, includes outer bucket, its characterized in that: the outer barrel is provided with a notch along at least one side of the width direction of the shell, and the notch is provided with the notch sealing structure.

Compared with the prior art, the utility model has the advantages that: the side plates are used for sealing the notch, so that the notch can be conveniently assembled and disassembled, and the strength of the notch end is improved while the notch is sealed;

the notched seal contains the outer bucket connecting portion of connecting outer bucket and the connecting portion of connecting the curb plate, link to each other through flexible connection spare between outer bucket and the curb plate, simple structure, easily installation, but this flexible connection spare both allows outer bucket and curb plate relative motion, can play certain cushioning effect again, reduce because of outer bucket along with the inner tube motion and transmit the vibrations on the casing, and then can enlarge the interior surface of pressing close to the casing with the curb plate, under the prerequisite that does not change the casing size, the inner tube diameter can obtain showing and promote.

Drawings

Fig. 1 is a schematic perspective view of a drum washing machine according to an embodiment of the present utility model (with a part of the casing removed).

Fig. 2 is a schematic diagram of an assembly structure of an inner tub and an outer tub of a drum washing machine according to an embodiment of the present utility model (including a damper).

Fig. 3 is an exploded perspective view of a sealing structure of an outer tub cut of a drum washing machine according to an embodiment of the present utility model.

Fig. 4 is an assembled sectional view of an inner tub and an outer tub of a drum washing machine according to an embodiment of the present utility model.

Fig. 5 is an enlarged schematic view of part I shown in fig. 4.

Fig. 6 is an enlarged partial schematic view of the portion II shown in fig. 4.

Fig. 7 is a schematic view (with partial cross-section and exploded) of another sealing structure of a drum washing machine tub cutout according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1, the drum washing machine of this embodiment includes a casing 1, an outer tub 2, an inner tub 3, a driving unit and a damping unit are disposed in the casing 1, wherein the inner tub 3 can accommodate laundry, the inner tub 3 is rotatably accommodated in the outer tub 2, the driving unit is usually a motor assembly and can drive the inner tub 3 to rotate, the damping unit is disposed between the inner tub 3 and the casing 1, and the damping unit 4 and the driving unit are in the prior art and will not be described herein.

In this embodiment, the horizontal direction is set as the width W of the casing 1, the depth direction is set as the depth D of the casing 1, the vertical direction is set as the height H of the casing 1, at least one notch 21 is formed in the casing 1 in the width direction of the outer barrel 2, and one notch 21 is formed in each of symmetrical sides of the outer barrel 2 in this embodiment, as shown in fig. 2 and 3, an end cover capable of closing the notch 21 is disposed on each notch 21.

In order to reduce vibration while ensuring the strength of the housing 2, the end cap of the present embodiment is a side plate 5 of hard material, which side plate 5 is fixedly disposed on the cutout 21 through the flexible connection 6, see fig. 2; the side plate 5 made of hard materials can seal the notch 21 and improve the strength of the notch 21, and the flexible connecting piece 6 has certain deformability and can play a certain role in buffering, so that vibration transmitted to the machine shell 1 due to the movement of the outer barrel 2 along with the inner barrel 3 is reduced.

Specifically, the flexible connecting piece 6 of this embodiment is an annular sealing piece with ripple fold and radial stretching, one end of the flexible connecting piece 6 is connected to the notch 21, the other end is connected to the side plate 5, the annular sealing piece has flexibility and connection strength, the ripple fold can realize flexible deformation and stretching, and meanwhile, the annular sealing piece has certain connection strength, so that the installation requirement in a narrow space can be met.

The flexible connection member 6 can realize flexible connection between the outer tub 2 and the side plate 5, and two specific connection modes are provided, wherein the first connection mode is as follows, and see fig. 3-6:

the circumference of the notch 21 is formed with a convex ring 211 extending outwards along the width direction of the casing 1, one end of the flexible connecting piece 6 is sleeved on the convex ring 211, one end edge of the flexible connecting piece 6 is perpendicularly and outwards folded and formed with a side sealing edge 61 which can be connected with the side wall of the outer barrel 2, an L-shaped folded angle is formed between the side sealing edge 61 and the edge of one end of the flexible connecting piece 6, see fig. 5 and 6, an annular first pressing strip 7 which can press the side sealing edge 61 on the side wall of the outer barrel 2 is sleeved on the folded angle, and the side wall of the outer barrel 2 is fixedly connected with the side sealing edge 61 of the flexible connecting piece 6 through the first pressing strip 7.

For convenient disassembly and assembly, the side sealing edge 61 is provided with first through holes 611 at intervals, correspondingly, the first pressing strip 7 is provided with second through holes 71 corresponding to the first through holes 611, the outer barrel 2 is provided with third through holes corresponding to the second through holes 71 along the edge of the notch 21, and the side sealing edge 61, the outer barrel 2 and the first pressing strip 7 are detachably connected through first fixing pieces (such as screws, bolts and the like) penetrating through the first through holes 611, the second through holes 71 and the third through holes.

The inner side of the side plate 5 is formed with a raised line 51, and the other end of the flexible connecting piece 6 is provided with a groove 62 for embedding and fixing the raised line 51; in order to increase the connection contact surface and improve the connection reliability, the raised strips 51 are annular raised strips 51 annularly arranged along the inner side of the side plate 5, and the grooves 62 are annular grooves 62 corresponding to the annular raised strips 51.

In order to further improve the connection strength, the other end of the flexible connecting piece 6 is provided with an annular second pressing strip 8 which can be buckled at the bottom of the groove 62 on the side corresponding to the back surface of the groove 62, and the other end of the flexible connecting piece 6 is fixedly connected with the side plate 5 through the second pressing strip 8.

For easy assembly and disassembly, the grooves 62 are circumferentially spaced apart and provided with fourth through holes 621, correspondingly, the second pressing strips 8 are provided with fifth through holes 81 at positions corresponding to the fourth through holes 621, the convex strips 51 of the side plates 5 are provided with sixth through holes (not shown) at positions corresponding to the fourth through holes 621, and the flexible connecting pieces 6, the side plates 5 and the second pressing strips 8 are detachably connected through second fixing pieces (such as screws, bolts and the like) penetrating through the fourth through holes 621, the fifth through holes 81 and the sixth through holes.

The flexible connection 6 enables the connection between the tub 2 and the side plate 5 in the second connection as follows, see fig. 7:

compared with the first connecting mode, the second connecting mode is simpler, the first pressing strip 7 and the second pressing strip 8 are omitted, and the specific structures of the connecting parts of the side plates 5 'and the connecting parts at the two ends of the flexible connecting piece 6' in the second connecting mode are changed.

Specifically, the side sealing edge of the flexible connecting piece 6 'in fig. 7 is an N-shaped side sealing edge formed by continuously and perpendicularly folding three times along the edge of one end of the flexible connecting piece 6', the N-shaped side sealing edge formed by repeatedly folding can improve the strength of the side sealing edge, any two adjacent edges of the N-shaped side sealing edge are perpendicular to each other, the N-shaped side sealing edge has three sections (shown by three arrows in fig. 7), and the last section of folded edge 611 'is fixedly connected with the outer barrel 2 through an annular connecting piece 7'.

The annular connecting piece 7 'is different from the first pressing strip 7 in the first connecting mode, in order to simplify the assembly structure and ensure the strength and the stability of connection, one end of the annular connecting piece 7' and the last section of the folded edge 611 'of the N-shaped side edge seal are integrally formed through an encapsulation process, and the other end of the annular connecting piece 7' and the outer barrel 2 are fixed through welding. The connection is firmer and more reliable, and the installation is more convenient and faster.

In order to increase the strength, the raised strips 51 of the connecting part of the side plate 5' in the second connecting mode are changed into raised ribs 51' which are annularly arranged along the inner side of the side plate 5', correspondingly, the grooves 62 are changed into annular clamping grooves 62' which can be in plug-in fit with the raised ribs 51', and the raised ribs 51' and the clamping grooves 62' are integrally formed by adopting an encapsulation process, so that the structure is firm, and the assembly is simpler and more convenient.

The second connecting mode eliminates the first pressing strip 7 and the second pressing strip 8, so that the assembly parts are reduced and the assembly structure is simplified while the strength of the product is ensured.

In this embodiment, in order to better fix the side plate 5 (5 '), besides the connection portion of the flexible connection member 6 (6 ') to the side plate 5 (5 '), two ends of the side plate 5 (5 ') are respectively formed with connection plates 52 (52 ') which can be fixedly connected to the casing 1 of the washing machine in an outward extending manner, see fig. 3 and 7; because curb plate 5 (5 ') is hard material, curb plate 5 (5') both ends are fixed on casing 1, can avoid curb plate 5 (5 ') to follow outer bucket 2 and rock, and then collide casing 1 and arouse vibrations, also can add damper at curb plate 5 (5') both ends and connect to casing 1 again to further reduce the vibrations that transmit to casing 1, improve the shock attenuation effect.

In order to further improve the strength of the outer tub 2 at the notch 21 and prevent deformation, the outer tub 2 is further provided with reinforcing ribs and reinforcing plate 9 connection structures at the upper and lower sides of the notch 21 in the height direction of the cabinet 1, respectively, so that the strength of the notch 21 can be further improved, see fig. 2 and 3.

The sealing structure of this embodiment mainly includes a connection portion where the flexible seal is connected to the outer tub 2, and a connection portion where the flexible seal is connected to the side plate 5, and in order to prevent water leakage and ensure connection tightness, the sealing shape of the connection portion of the side plate 5 to the flexible seal is matched with the shape of the tub cutout 21, preferably smaller than the opening size of the cutout 21, and therefore, in design, the side plate 5 needs to have a certain space margin in the vibration direction of the outer tub 2 in consideration of the sealing and vibration-proof effects.

As shown in fig. 5, if the sinking amount of the tub assembly of the washing machine at full load is a and the single-side amplitude of the outer tub 2 in the vertical direction is B, the value X in fig. 5 should be as follows: x > A+B, X is the distance from the lower edge 53 of the side plate to the lower edge 212 of the notch of the outer barrel 2, i.e. the annular surface of the notch 21 is prevented from overlapping with the side plate 5 when the outer barrel 2 is in operation (or the annular surface of the side plate 5 is always inside the annular surface of the notch 21 of the outer barrel 2 no matter how the outer barrel 2 moves).

In addition, the maximum single-side amplitude of the outer tub 2 in the left-right direction is set to be C (according to the conventional level, the value of C is generally 10-25 mm), and the maximum single-side amplitude of the inner tub 3 with respect to the outer tub 2 is set to be D at the rotation speed at which the outer tub 2 generates the maximum single-side amplitude, so that the value of Y in fig. 5 should be as follows: y is larger than C+D, Y is the minimum distance between the side plate 5 and the inner cylinder 3, and on the basis, the inner diameter of the inner cylinder 3 can be further enlarged, namely, collision interference between the side plate 5 and the inner cylinder 3 in the movement of the outer cylinder 2 is avoided.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Claims

1. The utility model provides a notch seal structure of washing machine outer barrel, washing machine outer barrel (2) hold in casing (1), its characterized in that: the washing machine outer barrel (2) is provided with a notch (21) along at least one side of the width direction of the shell (1), the notch (21) is provided with a side plate (5) capable of closing the notch (21), and the side plate (5) is fixedly arranged on the notch (21) through a flexible connecting piece (6);

the flexible connecting piece (6) is an annular sealing piece which is provided with corrugated folds and can be radially and elastically stretched, a convex ring (211) which extends outwards along the width direction of the shell (1) is formed in the circumferential direction of the notch (21), one end of the flexible connecting piece (6) is sleeved on the convex ring (211), one end edge of the flexible connecting piece (6) is outwards turned and folded, and a side sealing edge (61) which can be connected with the side wall of the outer barrel (2) is formed; the inner side of the side plate (5) is provided with a raised line (51), and the other end of the flexible connecting piece (6) is provided with a groove (62) for embedding and fixing the raised line (51).

2. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the two ends of the side plate (5) are respectively and outwards extended to form connecting plates which can be fixedly connected with the shell (1) of the washing machine.

3. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the side sealing edge (61) is vertically and outwards folded along the edge of one end of the flexible connecting piece (6), so that an L-shaped folding angle is formed between the side sealing edge (61) and the edge of one end of the flexible connecting piece (6), an annular first pressing strip (7) capable of pressing the side sealing edge (61) on the side wall of the outer barrel (2) is sleeved on the folding angle, and the side wall of the outer barrel (2) is fixedly connected with the side sealing edge (61) of the flexible connecting piece (6) through the first pressing strip (7).

4. A slit sealing construction of a washing machine tub as claimed in claim 3, wherein: the side sealing edge (61) is provided with first through holes (611) at intervals, correspondingly, the position of the first pressing strip (7) corresponding to the first through holes (611) is provided with second through holes (71), the edge of the outer barrel (2) along the notch (21) is provided with third through holes corresponding to the second through holes (71), and the side sealing edge (61), the outer barrel (2) and the first pressing strip (7) are connected through first fixing pieces penetrating through the first through holes (611), the second through holes (71) and the third through holes.

5. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the raised strips (51) are annular raised strips (51) which are annularly arranged along the inner side of the side plate (5), and correspondingly, the grooves (62) are annular grooves (62) corresponding to the annular raised strips (51).

6. The notch sealing structure of outer tub of washing machine as claimed in claim 5, wherein: the other end of the flexible connecting piece (6) is provided with an annular second pressing strip (8) which can be buckled at the bottom of the groove (62) on one side of the back surface corresponding to the groove (62), and the other end of the flexible connecting piece (6) is fixedly connected with the side plate (5) through the second pressing strip (8).

7. The notch sealing structure of the outer tub of the washing machine as claimed in claim 6, wherein: the groove (62) is provided with fourth through holes (621) at intervals along the circumferential direction, correspondingly, the second pressing strip (8) is provided with fifth through holes (81) at positions corresponding to the fourth through holes (621), the side plate (5) is provided with sixth through holes at positions corresponding to the fourth through holes (621), and the flexible connecting piece (6), the side plate (5) and the second pressing strip (8) are connected through second fixing pieces penetrating through the fourth through holes (621), the fifth through holes (81) and the sixth through holes.

8. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the side sealing edges are N-shaped side sealing edges which are formed by continuously and perpendicularly folding three times along the edge of one end of the flexible connecting piece, any two adjacent edges of the N-shaped side sealing edges are perpendicular to each other, and the last folded edge (611 ') of the N-shaped side sealing edges is fixedly connected with the outer barrel (2) through an annular connecting piece (7').

9. The cut-out sealing structure of a tub of a washing machine as claimed in claim 8, wherein: the annular connecting piece (7 ') and the last section of folded edge (611 ') of the N-shaped side edge are integrally formed through an encapsulation process, and the annular connecting piece (7 ') and the outer barrel (2) are fixed through welding.

10. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the convex strips are convex ribs which are annularly arranged along the inner side of the side plate, correspondingly, the grooves are annular clamping grooves which can be spliced with the convex ribs, and the convex ribs and the clamping grooves are integrally formed by adopting an encapsulation process.

11. The cut-out sealing structure of a tub of a washing machine as claimed in claim 1, wherein: the outer barrel (2) is also provided with reinforcing plates at the upper side and the lower side of the notch (21) along the height direction of the shell (1) respectively.

12. A washing machine comprising an outer tub (2), characterized in that: the outer barrel (2) is provided with a notch (21) along at least one side of the width direction of the casing (1), and the notch (21) is provided with the notch (21) sealing structure as set forth in any one of claims 1 to 11.