Thermodynamic sanitary water heating device comprising a box with pre-assembly with centring pin

Abstract

A thermodynamic domestic hot water heating device (1) includes a tank (2) extending along a main direction (X), a bucket (9) mounted on an upper part (4) of the tank (2) forming a bottom (8) and a peripheral wall (10) to create a receiving space (33) partially formed with a casing (16) comprising a first shell (18) which is configured to be removably mounted on the bucket (9) by a movement along a transverse direction (Dt), the first shell (18) deforming elastically during its assembly and comprising two lateral fixing members (120) cooperating with two fixing members (121) of the bucket (9) for removable fixing, as well as an inner surface (40) forming a housing (100) to cooperate with a centering stud (101) to center the first shell (18) relative to the bucket (9) during assembly in a plane transverse to the main direction (X).

Description

technical field

[0001] The present invention relates to the field of building construction, particularly domestic hot water. In particular, the invention relates to a domestic hot water heating device. Technological background

[0002] There are domestic hot water heating systems with heat pumps in which the cold source for pumping is taken from a building's ventilation flow. They are therefore called "combined" because they provide both hot water production and building ventilation.

[0003] Generally, a heat exchanger for the heat pump is mounted above the storage tank in a bucket, closed by a lid, or between two shells.

[0004] The two shells are sometimes held in place on the device by screwing them together. However, this solution is not ideal because assembling the shells is complicated. The first shell must be positioned on the device, then the second shell must be brought into position, all while holding the first shell with one hand, or hoping it will stay put. This also poses a problem during heat pump maintenance, as opening the casing risks dislodging one of the shells, particularly the rear shell, which is difficult to access once installed at the customer's site. Screwing them together also requires specialized tools, which ties up one of the installer's hands and therefore limits their ability to handle the shell(s).

[0005] To facilitate the assembly and maintenance of the shells on the device, it is common practice to screw the first shell onto the outer casing of the tank. However, this additional screwing step reduces the production rate of water heating devices. This solution also degrades the device's external appearance.

[0006] Documents WO2024 / 066838, WO2024 / 066839 and WO2024 / 066818 describe a water tank with a heat pump installed on top of the tank.

[0007] There is a need to further improve the assembly of the casing of thermodynamic water heating devices to simplify production and maintenance while ensuring an aesthetically pleasing external appearance. Summary of the invention

[0008] The present invention addresses these needs through a thermodynamic domestic hot water heating device comprising: a water storage tank extending in a principal direction; a bucket mounted on the upper part of the tank, the bucket forming a base and comprising a peripheral wall extending from and around the base to form at least partially a receiving space; a box forming a side wall of the box and a top surface of the box to form at least partially with the bucket the receiving space, the box comprising a first shell and a second shell, the first shell forming half a side wall of the box and half a top surface of the box; a water heating module comprising a heat pump, at least part of the heat pump being disposed in the receiving space; an air extraction module mounted inside the receiving space; characterized in thatthe first shell is configured to be removably mounted on the bucket by a movement along a direction substantially transverse to the main direction, the first shell being configured to deform elastically when mounted on the bucket; and in that the first shell comprises two lateral fixing members configured to cooperate, through the elastic deformation of the first shell when the first shell is mounted on the bucket, with two corresponding fixing members of the bucket for the removable fixing of the first shell on the bucket;and in that the first shell comprises an inner surface forming a housing between the two lateral fixing members configured to cooperate with the bucket and to center the first shell relative to the bucket when mounting the first shell on the bucket to allow mounting the first shell on the bucket in a transverse plane with a principal direction.

[0009] The term "exhaust air" refers to air extracted from inside the building, particularly for the removal of stale air and / or air renewal within the building, air extracted from inside the building near the unit, or air extracted from outside via ducts. Specifically, the air extracted from the building is the heat source for the heat pump, which then heats the water in the storage tank.

[0010] In the present invention, the use of two lateral fastening elements configured to cooperate, through the elastic deformation of the first shell during its mounting onto the bucket, with two corresponding fastening elements on the bucket for the removable attachment of the first shell to the bucket, allows for the "pre-mounting" and therefore the "pre-fixing" of the first shell. This operation can be performed without tools, thus allowing the installer to use both hands to handle the shell. The assembly operation is therefore simplified, as the first shell is pre-fixed before final attachment. Consequently, it is not necessary to hold the first shell or risk it falling during its final fixing.

[0011] In addition, the use of a housing for centering ensures the correct positioning of the first shell during assembly, which facilitates the fixing of the first shell once pre-fixed, because it is correctly positioned.

[0012] Furthermore, no external screws are required to attach the first shell to the bucket, resulting in a more aesthetically pleasing exterior appearance. Specifically, the outer surface of the water storage tank can be flush with the outer surface of the container.

[0013] The housing can be configured to cooperate with a centering pad mounted on the bucket and to center the first shell relative to the bucket when mounting the first shell on the bucket to allow the first shell to be mounted on the bucket in a transverse plane with a main direction.

[0014] More specifically, the water storage tank may include a tank covered at least on a peripheral surface by a side wall of a mantle, the side wall of the casing extending in line with the side wall of the mantle.

[0015] In particular, the outer surface of the side wall of said mantle preferably extends in continuity with an outer surface of the side wall of the caisson.

[0016] The balloon can expand along a main vertical direction.

[0017] The lateral wall of the mantle can surround the tank around the main direction.

[0018] The bottom of the bucket can extend in a plane perpendicular to the main direction.

[0019] The peripheral wall of the bucket can extend from the bottom around the main direction and substantially parallel to the main direction.

[0020] The side wall of the box can extend around the main direction and substantially parallel to the main direction.

[0021] The upper wall of the box can extend in a plane perpendicular to the main direction.

[0022] The water storage tank preferably has a circular cross-section transverse to the main direction.

[0023] The outline of the peripheral wall of the bucket and / or the outline of the side wall of the container taken transversely to the main direction can be polygonal, for example rectangular or square, oval or circular.

[0024] The water storage tank preferably includes thermal insulation positioned between the tank and the casing.

[0025] The side wall of the box can overlap, preferably completely, the peripheral wall of the bucket.

[0026] The second shell can be removably attached to the first shell, each shell forming a half side wall of the box and a half top surface of the box, the half side walls of the box forming the side wall of the box and the half top surfaces of the box forming the top surface of the box;

[0027] The shells can be configured to be elastically deformed when mounted on the device, particularly on the bucket.

[0028] The deformation of the side wall half required for the assembly of the first shell and / or shells includes a bending around an axis parallel to the main direction to initiate a displacement of each of the end edges of the side wall half.

[0029] Each of the side walls of the box can extend along an angular sector around the main direction, in particular an angular sector around the main direction of 180°.

[0030] The term "half-wall" refers to a side wall comprised of two sections to form the entire side wall. However, this formulation does not imply that the angular sector around the principal direction is necessarily 180°. The same applies to other elements using a formulation with "half".

[0031] The centering block may include a keying system configured to ensure correct positioning relative to the main direction of the first shell relative to the bucket.

[0032] The housing can be configured to cooperate by snapping, when mounting the first shell onto the bucket, with the centering block.

[0033] The centering pin may comprise a lower and an upper portion aligned along the main direction, forming a keying system. The snap-fit ​​mechanism between the housing and the pin is only possible on the lower portion. Thus, during assembly, the user receives confirmation that the first shell is correctly positioned along the main direction if the pin is engaged, and conversely, confirmation that the first shell is incorrectly positioned along the main direction if the pin is not engaged. This confirmation, through the use of the snap-fit ​​mechanism, is at least audible and tactile, allowing assembly to be performed blindly, i.e., without being able to see both the housing and the pin simultaneously, particularly when the first shell is mounted onto the bucket from the rear.

[0034] The first shell may include at least one recess configured to form a preferential deformation zone of the housing when snapping the stud and the housing together when mounting the first shell onto the bucket.

[0035] The housing may include a guide portion, the guide portion being open towards the interior of the first shell, and a snap-fit ​​portion of the stud, the guide portion opening into the snap-fit ​​portion of the stud, the housing being configured so that, when mounting the first shell onto the bucket, the stud passes through the guide portion and then cooperates by snap-fitting with the snap-fit ​​portion, the interaction between the guide portion and the stud being configured to guide the first shell in a plane transverse to the main direction when mounting the first shell onto the bucket.

[0036] The first shell may include a projection extending from the inner surface to a lower central portion. This projection forms a resting surface for the first shell on the bucket during assembly. This projection allows the first shell to rest on the bucket, specifically on the upper edge of the bucket's peripheral wall, at the beginning of the assembly process. This provides an initial indication of the first shell's position, which is particularly advantageous for facilitating assembly, especially when blind assembly is required.

[0037] The first shell may include a half-lip extending from the inner surface of the side wall half of the box, the half-lip forming said housing, the housing forming a break in the half-lip configured to form a preferential deformation zone of the first shell to facilitate the elastic deformation of said shell when mounted on the bucket.

[0038] The preferred deformation zone of the first shell may be close to the housing.

[0039] The half-lip can form said projection.

[0040] The height of the peripheral wall of the bucket perpendicular to the bottom may be less than the height of the side wall of the container perpendicular to the bottom.

[0041] The heat pump may include a first water heating heat exchanger and a second heat exchanger, the second heat exchanger being positioned in the receiving space, particularly on the bottom.

[0042] The enclosure may include an air inlet and an air outlet.

[0043] The extraction module can be configured to create an airflow through the second heat exchanger.

[0044] The extraction module may include a fan or is configured to be connected to a fan, the fan being configured to allow air circulation between the inlet and outlet.

[0045] The storage tank can have a water storage volume of between 50 l and 300 l. Brief description of the figures

[0046] The following description, with reference to the accompanying drawings, given by way of non-limiting examples, will clearly explain the nature of the invention and how it can be implemented. Regarding the accompanying figures: [ Fig. 1 ] illustrates, in perspective, an example of a device according to the invention; [ Fig. 2 ] illustrates, in perspective, an upper part of the device of the figure 1 , a shell of the caisson being omitted; Fig. 3 ] illustrates, in perspective, partially, a shell of the device's housing figure 1 ; Fig. 4 ] is a longitudinal section of the device of the figure 1 at the junction between the water storage tank and the casing; [ Fig. 5 ] illustrates, from a top view, one of the shells and the bucket of the device of the figure 1 ; Fig. 6 ] illustrates, in perspective, partially, the housing of one of the shells of the device of the figure 1 ; Fig. 7] illustrates, in perspective, partially, an enlargement at the level of the housing of one of the shells and the bucket's base of the device figure 1 ; Fig. 8 ] is a longitudinal section of the device of the figure 1 at the level of the housing and the plot; Fig. 9 ] is a partial perspective view of the lower part of a lateral edge of one of the shells of the device figure 1 ; Fig. 10 ] is a partial perspective view of the lateral joint of one of the shells on the bucket; and Fig. 11 ] is a view similar to that of the figure 5 the shell being separated from the bucket. Description of method(s) of implementation

[0047] In the following description, identical elements or elements with identical functions are designated by the same reference numeral. For the sake of brevity, they are not described alongside each figure; only the differences between the embodiments are described.

[0048] We illustrated on the figures 1 to 11 an example of a thermodynamic domestic hot water heating device 1 according to the invention.

[0049] Device 1 includes a domestic hot water storage tank 2 extending along a vertical principal direction X. Tank 2 has, for example, a storage volume of 200 liters.

[0050] The ball 2 thus comprises a lower part 3, which is intended to be directed towards the ground, and an upper part 4, opposite the lower part 3.

[0051] Device 1 includes a bucket 9 mounted on the upper part 4 of the balloon 2, as illustrated in view of the figure 2 notably.

[0052] The bucket 9 includes a base 8 which preferably extends in a substantially horizontal plane P, that is to say transversely to the principal direction X of the balloon 2.

[0053] The bucket 9 also has a peripheral wall 10 around the bottom 8 which extends substantially perpendicularly to the bottom 8.

[0054] Device 1 includes a box 16 formed of two shells 17 and 18 mounted removably on the bucket 9. In this example, one of the shells is called the front shell 17, the other is called the rear shell 18.

[0055] Shells 17 and 18 each form a half side wall of box 30 which together form, when shells 17 and 18 are mounted on bucket 9, a side wall of box 32.

[0056] Shells 17 and 18 each form a half upper surface of box 31 which together form, when shells 17 and 18 are mounted on bucket 9, an upper surface of box 20.

[0057] The side wall of box 32 and the upper surface of box 20 together with the bucket 9 form a receiving space 33.

[0058] Device 1 comprises, as illustrated in the view of the figure 2 , a water heating module 5 comprising a heat pump 6.

[0059] Heat pump 6 includes a water heating heat exchanger (not shown) which is, for example, located inside tank 2.

[0060] The heat pump 6 also includes a second heat exchanger 7 positioned in the receiving space 33.

[0061] Device 1 also includes an air extraction module 15 mounted on the bottom 8.

[0062] The air extraction module 15 also includes a fan 21 mounted on the bottom 8 in the receiving space 33 allowing an airflow between an air inlet 22 and an air outlet 23.

[0063] The air inlet 22 and the air outlet 23 are positioned on the upper half surface 31 of the rear shell 18 of the box 16. The air extraction module 15 is configured so that the airflow passes through the second heat exchanger 7.

[0064] The air extraction module 15 may include branch connections at the inlet 22 and outlet 23.

[0065] The height Hp of the peripheral wall 10 of the bucket 9 taken perpendicular to the bottom 8, which is substantially constant, is less than the height He of the half-side wall of the box 30, and therefore of the side wall of the box 32, perpendicular to the bottom 8.

[0066] The balloon 2 comprises on a peripheral surface a mantle 37 having a lateral wall 36. The mantle 37 covers a tank, not visible in the figures.

[0067] As illustrated in particular on the Figures 1 And 4, the side wall of caisson 31 extends in line with the side wall 36 of mantle 37.

[0068] In particular, the outer surface of the side wall 36 of the mantle 37 preferably extends in continuity with the outer surface of the side wall of the caisson 32.

[0069] Each shell 17 and 18 is configured to be removably mounted on the bucket 9 by a movement along a mounting axis T substantially transverse to the main direction X. Thus, each shell is preferably configured to be mounted on the bucket in a substantially horizontal plane which allows for easy handling of the box in a very constrained space environment, such as a cupboard or in the case where the heating device is located very close to the ceiling of the room.

[0070] For this assembly on the bucket 9, the shells 17 and 18 are configured to deform elastically by bending around an axis parallel to the main direction X to initiate a lateral displacement Dt of each of the end edges 35 of the lateral half-wall 30. The lateral displacement Dt is carried out along an axis substantially perpendicular to the main direction X and to the assembly axis T.

[0071] The side wall 36 of the mantle 37 can surround the tank around the main direction X.

[0072] The side wall of box 30 can extend around the main direction X and substantially parallel to the main direction X.

[0073] The upper wall of box 20 can extend in a plane perpendicular to the main direction X.

[0074] The water storage tank 2 is preferably circular in cross-section transverse to the main direction X.

[0075] The contour of the peripheral wall 10 of the bucket 9 and the contour of the side wall of the box 32 taken transversely to the main direction X is preferably circular.

[0076] As illustrated in particular on the figures 3 to 11 , each shell 17 and 18 includes a half-lip 41 which extends from a lower portion of an inner surface 40 of the lateral half-wall of the box 30. Each half-lip 41 extends in particular in a plane substantially transverse to the main direction X.

[0077] When the shells 17 and 18 are mounted on the bucket 9, the half-lips 41 together form a lip 42 of the box 16 which extends around the main direction X.

[0078] Each half-lip 41 has a lower surface 45, oriented downwards, which rests on a flat portion of an upper edge 46 of the peripheral wall 10 of the bucket 9.

[0079] The bucket 9 includes an outer skirt 60, extending from the edge 46. This outer skirt 60 allows the insertion of an upper part 61 of the mantle 37 between the outer skirt 60 and the peripheral wall 10 of the bucket 9.

[0080] Furthermore, the edge 46 is provided with an external radial bead 62 which is inserted between the half-lip 41 of each shell 17 and 18 and an internal rib 63 on the internal surface 40 of the lateral half-wall of the box 30. This insertion allows a locking of each half-shell 17 and 18 along the main direction X.

[0081] As illustrated in the view of the figure 3 , the half-lip 41 of at least one of the shells 17 and 18, in this example at least the rear shell 18, has a break 65 configured to facilitate the elastic deformation of said shell 17 or 18 and the lateral displacement Dt of each of the end edges 35 of the lateral half-wall 30 when mounted on the bucket 9.

[0082] The interrupt 65 is present at a central position of the half-lip 41. However, the interrupt 65 could be at another position between the two end edges 35 of the lateral half-wall 30. In an unillustrated variant, the half-lip 41 could include a plurality of interrupts 65.

[0083] In this example, the length Li of the interruption 65, measured along an elongation direction E of the half-lip 41, is less than 20% of the length LI of the half-lip 41, measured along the elongation direction E.

[0084] The interruption 65 is here formed by a reduction in width La of the half-lip 45, down to a width almost zero or zero.

[0085] The interruption 65 is configured to form a preferential deformation zone 115 of the shell 18 at the level of a central part of the side wall half of the box 30 to facilitate the elastic deformation of said shell 18 when mounted on the bucket 9.

[0086] This interruption 65 forms a housing 100 configured to cooperate with a centering stud 101 mounted on the bucket 9 and to center the shell 18 relative to the bucket 9 when it is mounted on the bucket 9 to allow the mounting of the shell 18 on the bucket 9 in a transverse plane with main direction.

[0087] Housing unit 100 has a keyhole shape in a horizontal plane, as illustrated by the view of the figure 6. More particularly, the housing 100 includes a guide portion 102 open towards the inside of the shell 18, and therefore towards the receiving space 33, and a snap-fit ​​portion 103 of the stud 101, the guide portion 102 opening into the snap-fit ​​portion 103 of the stud 101.

[0088] The guide portion 102 has a flared shape towards the receiving space 33. This shape allows, when mounting the shell 18 on the bucket 9, to guide the shell 18 in a plane transverse to the main direction X thanks to the interaction between the guide portion 102 and the stud 101.

[0089] The flared shape allows progressive guidance of the shell 18 until the snap-fit ​​of the stud 101 with the snap-fit ​​portion 103.

[0090] In this example, to allow snapping, the half-lip 41 includes two recesses 105 bordering laterally the housing 100. The recesses 105 thus define two arms 106 lateral to the housing 102 and, on each arm 106, a preferential deformation zone during snapping of the stud 101 and the housing 100.

[0091] More specifically, when the pin 101 is clicked onto the click portion 103, the arms 106 will deform elastically to allow this click.

[0092] As illustrated in the views of figures 7 And 8 , the plot 101 extends vertically from the upper edge 46 of the peripheral wall 10 of the bucket 9.

[0093] The stud 101 comprises a lower portion 110 and an upper portion 111. The snap-fit ​​of the stud 101 into the housing 102 is only possible on the lower portion 110. In other words, the upper portion 111 cannot snap into the housing 102, thus providing a keying function in the positioning of the shell 18 along the main direction X.

[0094] In this example, in cross-section, the stud 101 has a circular arc shape. The diameter of this arc is virtually identical between the lower portion 110 and the upper portion 111. To create the keying feature, the sector of this arc at the upper portion 11 is reduced compared to that of the lower portion.

[0095] In addition, the lateral sides 112 include a flat surface to enhance the error-proofing function.

[0096] Plot 101 may be hollow.

[0097] Plot 101 may also have elasticity to facilitate the assembly of shell 18.

[0098] Shell 18 also includes, as illustrated in the views of figures 9 And 10 , in a lower part of the inner surface 40 near the end edges 35, two lateral fixing members 120 configured to cooperate, through the elastic deformation of the shell 18 when mounting the shell 18 on the bucket 9, with two corresponding fixing members 121 of the bucket 9 for the removable fixing of the shell 18 on the bucket 9.

[0099] As illustrated in the view of figure 9 , the lateral attachment organs 120 can be formed by a notch extending vertically from the bottom of the shell 18 to the inner rib 63.

[0100] As illustrated in the view of Figure 10, the two fixing elements 121 of the bucket 9 are for example formed by a protruding protuberance on an outer face of the outer skirt 60 of the bucket 9.

[0101] To facilitate the assembly of the shell 18, particularly blind assembly (i.e., with an operator positioned opposite the inner surface 40 of the shell 18), the half-pound 41 may include a projection 130. This projection 10 allows the shell 18 to rest on the upper edge 46 of the peripheral wall 10 of the bucket 9 during assembly, as illustrated in the figure 11 .

[0102] This advance 130 extends in line with the extension plane of the half-lip 41.

[0103] For example, the maximum width La at the point of the advance is at least equal to 1.5 times the minimum transverse displacement required for mounting the shell 18 on the bucket 9.

[0104] The shell 18 may include vertical ribs 131 at the projection 130 to stiffen the projection 130 and allow it to be placed on the upper edge 46 of the peripheral wall 10 of the bucket 9 during assembly without major deformation of the projection 130.

[0105] In this example, the 130 extension comprises two parts between which the 100 housing unit is formed.

[0106] Although not illustrated, the shell 17, or front shell, may also include all the elements described for the shell 18, or rear shell, in particular with regard to the half-lip 41, the housing 100, the two lateral fixing members 120 and two corresponding fixing members 121 of the bucket 9, the bucket 9 including a second stud 101 to cooperate with the housing 10 of the shell 17.

Claims

1. A thermodynamic domestic hot water heating device (1) comprising: - a water storage tank (2) extending along a main direction (X); - a bucket (9) mounted on an upper part (4) of the tank (2), the bucket (9) forming a base (8) and comprising a peripheral wall (10) extending from and around the base (8) to form at least partially a receiving space (33); - a casing (16) forming a side wall of the casing (32) and an upper surface of the casing (20) to form at least partially with the bucket (9) the receiving space (33), the casing (16) comprising a first shell (18) and a second shell (17), the first shell (18) forming a half side wall of the casing (30) and a half upper surface of the casing (31); - a water heating module (5) comprising a heat pump (6), at least part of the heat pump (6) being disposed in the receiving space (33);- an air extraction module (15) mounted inside the receiving space (33); characterized in that the first shell (18) is configured to be removably mounted on the bucket (9) by a movement along a direction (T) substantially transverse to the principal direction (X), the first shell (18) being configured to deform elastically during its mounting on the bucket (9); and in that the first shell (18) includes two lateral fastening members (120) configured to cooperate, through the elastic deformation of the first shell (18) during the mounting of the first shell (18) onto the bucket (9), with two corresponding fastening members (121) of the bucket (9) for the removable attachment of the first shell (18) onto the bucket (9); and in thatthe first shell (18) includes an inner surface (40) forming a housing (100) included between the two lateral fixing members (120) configured to cooperate with the bucket (9) and to center the first shell (18) relative to the bucket (9) when mounting the first shell (18) on the bucket (9) to allow mounting the first shell (18) on the bucket (9) in a transverse plane with main direction (X).

2. Device (1) according to claim 1, characterized in that the housing (100) is configured to cooperate with a centering stud (101) mounted on the bucket (9) and to center the first shell (18) relative to the bucket (9) when mounting the first shell (18) on the bucket (9) to allow the mounting of the first shell (18) on the bucket (9) in a transverse plane with principal direction (X).

3. Device (1) according to claim 1 or 2, characterized in thatthe centering block (101) includes a keying system configured to ensure correct positioning relative to the main direction (X) of the first shell (18) with respect to the bucket (9).

4. Device (1) according to claim 2 or 3, characterized in that the housing (100) is configured to cooperate by snap-fit, when mounting the first shell (18) on the bucket (9), with the centering stud (101).

5. Device (1) according to claims 3 and 4, characterized in that The centering stud (101) comprises a lower portion (110) and an upper portion (111) forming the keying system, the snap-fit ​​cooperation of the housing (100) and the stud (101) being possible only on the lower portion (110).

6. Device (1) according to any one of claims 4 and 5, characterized in thatthe first shell (18) includes at least one recess (105) configured to form a preferential deformation zone of the housing (100) when snapping the stud (101) and of the housing (100) when mounting the first shell (18) on the bucket (9).

7. Device (1) according to any one of claims 4 to 6, characterized in thatthe housing (100) includes a guide portion (102), the guide portion (102) being open towards the inside of the first shell (18), and a snap-fit ​​portion (103) of the stud, the guide portion (102) opening into the snap-fit ​​portion (103) of the stud, the housing (100) being configured so that, when mounting the first shell (18) onto the bucket (9), the stud (101) passes through the guide portion (102) and then cooperates by snap-fit ​​with the snap-fit ​​portion (103), the interaction between the guide portion (102) and the stud (101) being configured to guide the first shell (18) in a plane transverse to the main direction (X) when mounting the first shell (18) onto the bucket (9).

8. Device (1) according to any one of the preceding claims, characterized in thatthe first shell (18) includes an extension (130) extending from the inner surface (40) to the level of a lower central portion, the extension (130) forming a resting surface of the first shell (18) on the bucket when mounting the first shell (18) on the bucket (9).

9. Device (1) according to any one of the preceding claims, characterized in that the first shell (18) includes a half-lip (41) extending from the inner surface (40) of the side wall half of the box (30), the half-lip (41) forming said housing (100), the housing (100) forming an interruption (65) of the half-lip (41) configured to form a preferential deformation zone (115) of the first shell (18) to facilitate the elastic deformation of said shell (18) when mounted on the bucket (9).

10. Device (1) according to claims 8 and 9, characterized in that the half-lip (41) forms the said projection (130).

11. Device (1) according to any one of the preceding claims, characterized in that the height (Hp) of the peripheral wall (10) perpendicular to the bottom (8) is less than the height (He) of the side wall of the box (30) perpendicular to the bottom (8).

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