Thermodynamic domestic hot water heating system comprising a pre-assembled casing with centering 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). Figure for the summary: Figure 5

Description

Title of the invention: Thermodynamic domestic hot water heating device comprising a pre-assembled casing with centering pin. 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 devices with heat pumps in which the cold source for pumping is taken from a building's ventilation flow. They are thus called "combined" in that they allow for the production of hot water and the ventilation of a building.

[0003] Generally, a heat exchanger of 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 position on the device by screwing them together. However, this solution is not optimal because assembling the shells is complicated. Indeed, 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 that it will stay in place. This also poses a problem during heat pump maintenance, as opening the casing carries the risk of one of the shells falling, particularly the rear shell, which is difficult to access once installed at the customer's site. Screwing them together also requires the use of specialized tools, which occupies 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 known to fix a first shell by screwing it onto the outer casing of the tank. However, this additional screwing step reduces the production rates of the water heating devices. This solution also degrades the external appearance of the device.

[0006] 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 aesthetic external appearance. Summary of the invention

[0007] The present invention meets these needs by means of a thermodynamic domestic hot water heating device comprising: - a water storage tank extending along a main direction; - a bucket mounted on an upper part of the balloon, 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 that the 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 included between the two lateral fixing members configured to cooperate with the bucket and to center the first shell relative to the bucket when the first shell is mounted on the bucket to allow the first shell to be mounted on the bucket in a transverse plane with a principal direction.

[0008] The term "extracted air" refers to air extracted from inside the building, particularly for the removal of stale air and / or the renewal of air in the building, air extracted from inside the building in the vicinity of the device, or air extracted from outside via ducts. In particular, the air extracted from the building is the heat input source for the heat pump, which then heats the water in the storage tank.

[0009] In the present invention, the use of two lateral fastening members configured to cooperate, through the elastic deformation of the first shell during its mounting on the bucket, with two corresponding fastening members of the bucket for the removable attachment of the first shell to the bucket, allows for a "pre-mounting" of the first shell and thus a "pre-fixing" thereof. This operation can be performed without tools and thus allows the installer to use Both hands are needed to handle the shell. The assembly process is thus simplified, as the first shell is pre-attached before final fixing. Therefore, it is not necessary to hold the first shell or risk it falling during its final attachment.

[0010] In addition, the use of a housing for centering ensures that the first shell is correctly positioned during assembly, which facilitates the fixing of the first shell once pre-fixed, because it is correctly placed.

[0011] Furthermore, no external screwing is required to attach the first shell to the bucket, resulting in a more aesthetically pleasing external appearance of the device. In particular, the external surface of the water storage tank can be flush with the external surface of the container.

[0012] 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 mounting the first shell on the bucket in a transverse plane with main direction.

[0013] More particularly, 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.

[0014] 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 box.

[0015] The balloon can extend along a main vertical direction.

[0016] The side wall of the mantle can surround the tank around the main direction.

[0017] The bottom of the bucket can extend in a plane perpendicular to the main direction.

[0018] The peripheral wall of the bucket can extend from the bottom around the main direction and substantially parallel to the main direction.

[0019] The side wall of the box can extend around the main direction and substantially parallel to the main direction.

[0020] The upper wall of the box can extend in a plane perpendicular to the main direction.

[0021] The water storage tank preferably has a circular cross-section transverse to the main direction.

[0022] The contour of the peripheral wall of the bucket and / or the contour of the side wall of the box taken transversely to the main direction can be polygonal, for example rectangular or square, oval or circular.

[0023] The water storage tank preferably includes thermal insulation positioned between the tank and the jacket.

[0024] The side wall of the box can overlap, preferably totally, the peripheral wall of the bucket.

[0025] 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;

[0026] The shells can be configured to be elastically deformed when mounted on the device, in particular on the bucket.

[0027] The deformation of the lateral half-wall required for mounting 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 lateral half-wall.

[0028] 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°.

[0029] The term "half-wall" refers to a side wall comprising two wall portions 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".

[0030] 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.

[0031] The housing can be configured to cooperate by snapping, when mounting the first shell on the bucket, with the centering pin.

[0032] The centering pin may comprise a lower portion and an upper portion along the principal direction, forming the 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 an indication of whether the first shell is correctly positioned along the principal direction if the pin is snapped in, and conversely, an indication of whether the first shell is incorrectly positioned along the principal direction if the pin is not snapped in. This indication, through the use of the snap-fit ​​mechanism, is at least audible and haptic, so that assembly can be carried out blindly, that is, without being able to see both the housing and the pin simultaneously, particularly when the first shell is mounted on the bucket from the rear of the first shell.

[0033] 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.

[0034] The housing may include a guide portion, the guide portion being open towards the inside 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 on the bucket, the stud passes through the guide portion and then cooperates by snap-fit ​​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 on the bucket.

[0035] The first shell may include a projection extending from the inner surface to a lower central portion, the projection forming a resting surface for the first shell on the bucket during its assembly. This projection allows the first shell to rest on the bucket, specifically on an upper edge of the bucket's peripheral wall, at the beginning of the assembly process, thus providing an initial indication of the first shell's position, which is particularly advantageous for facilitating assembly, especially for blind assembly.

[0036] 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 an interruption of 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.

[0037] The preferential deformation zone of the first shell may be close to the housing.

[0038] The half-lip can form said advance.

[0039] 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 box perpendicular to the bottom.

[0040] 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, in particular on the bottom.

[0041] The enclosure may include an air inlet and an air outlet.

[0042] The extraction module can be configured to create an airflow through the second heat exchanger.

[0043] 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.

[0044] The storage tank can have a water storage volume of between 50 l and 300 l. Brief description of the figures

[0045] The following description, with reference to the accompanying drawings, given by way of non-limiting examples, will clearly explain what the invention consists of and how it can be implemented. In the accompanying figures:

[0046] [Fig-1] illustrates, in perspective, an example of a device according to the invention;

[0047] [Fig.2] illustrates, in perspective, an upper part of the device of [Fig.1], a shell of the caisson being omitted;

[0048] [Fig.3] illustrates, in perspective, partially, a shell of the casing of the device the [Fig.l];

[0049] [Fig.4] is a longitudinal section of the device of [Fig.1] at the junction between the water storage tank and the container;

[0050] [Fig. 5] illustrates, in top view, one of the shells and the bucket of the device of the [Fig.l];

[0051] [Fig.6] illustrates, in perspective, partially, the housing of one of the shells of the device of the [Fig.l];

[0052] [Fig.7] illustrates, in perspective, partially, an enlargement at the level of the housing of one of the shells and the block of the bucket of the device of the [Fig.l];

[0053] [Fig.8]] is a longitudinal section of the device of [Fig.1] at the level of the housing and the stud;

[0054] [Fig.9] is a partial perspective view of a lower part of a lateral edge of one of the shells of the device in [Fig.1];

[0055] [Fig. 10] is a partial perspective view of the lateral joint of one of the shells on the bucket; and

[0056] [Fig. 11]] is a view similar to that of [Fig.5], the shell being separated from the bucket. Description of method(s) of implementation

[0057] In the following description, identical elements or elements with identical functions bear the same reference numeral. For the sake of brevity, they are not described opposite each figure; only the differences between the embodiments are described.

[0058] Figures 1 to 11 illustrate an example of a thermodynamic domestic hot water heating device 1 according to the invention.

[0059] The device 1 includes a domestic hot water storage tank 2 extending along a vertical principal direction X. The tank 2 has, for example, a storage volume of 200 l.

[0060] 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.

[0061] Device 1 includes a bucket 9 mounted on the upper part 4 of the balloon 2, as illustrated in particular in the view of [Fig.2].

[0062] The bucket 9 includes a bottom 8 which preferably extends in a substantially horizontal plane P, that is to say transversely to the main direction X of the balloon 2.

[0063] The bucket 9 also includes a peripheral wall 10 around the bottom 8 which extends substantially perpendicularly to the bottom 8.

[0064] The device 1 comprises 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.

[0065] The shells 17 and 18 each form a half of the side wall of the box 30 which together form, when the shells 17 and 18 are mounted on the bucket 9, a side wall of the box 32.

[0066] The shells 17 and 18 each form a half upper surface of box 31 which together form, when the shells 17 and 18 are mounted on the bucket 9, an upper surface of box 20.

[0067] The side wall of the box 32 and the upper surface of the box 20 together with the bucket 9 form a receiving space 33.

[0068] The device 1 comprises, as illustrated in the view of [Fig.2], a water heating module 5 comprising a heat pump 6.

[0069] The heat pump 6 includes a water heating heat exchanger (not shown) which is, for example, located inside the tank 2.

[0070] The heat pump 6 further comprises a second heat exchanger 7 positioned in the receiving space 33.

[0071] The device 1 also includes an air extraction module 15 mounted on the bottom 8.

[0072] The air extraction module 15 further 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.

[0073] 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.

[0074] The air extraction module 15 may include branch connections at the inlet 22 and outlet 23.

[0075] 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 of the side wall of the box 30, and therefore of the side wall of the box 32, perpendicular to the bottom 8.

[0076] 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.

[0077] As illustrated in particular in figures 1 and 4, the side wall of the caisson 31 extends in line with the side wall 36 of the mantle 37.

[0078] 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.

[0079] 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 easier handling of the box in a very constrained environment, such as a cupboard or in the case where the heating device is located very close to the ceiling of the room.

[0080] For this mounting 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 mounting axis T.

[0081] The side wall 36 of the mantle 37 can surround the tank around the main direction X.

[0082] The side wall of the box 30 can extend around the main direction X and substantially parallel to the main direction X.

[0083] The upper wall of the box 20 can extend in a plane perpendicular to the main direction X.

[0084] The water storage tank 2 preferably has a circular cross-section transverse to the main direction X.

[0085] The contour of the peripheral wall 10 of the bucket 9 and the contour of the lateral wall of the box 32 taken transversely to the main direction X is preferably circular.

[0086] As illustrated in particular in Figures 3 to 11, each shell 17 and 18 comprises a half-lip 41 which extends from a lower portion of an inner surface 40 of the half-side wall of the box 30. Each half-lip 41 extends in particular in a plane substantially transverse to the main direction X.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] As illustrated in the view of [Fig.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 side half-wall 30 when mounted on the bucket 9.

[0092] The interrupt 65 is present at a central position of the half-lip 4L. 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 comprise a plurality of interrupts 65.

[0093] 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 L1 of the half-lip 41, measured along the elongation direction E.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] The housing 100 has, in a horizontal plane, a keyhole shape, as illustrated in the view of [Fig.6]. More particularly, the housing 100 comprises a guide portion 102 open towards the interior 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.

[0098] 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, the shell 18 to be guided in a plane transverse to the main direction X thanks to the interaction between the guide portion 102 and the stud 101.

[0099] The flared shape allows progressive guidance of the shell 18 until the snap-fit ​​of the stud 101 with the snap-fit ​​portion 103.

[0100] 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.

[0101] More particularly, when the stud 101 is clicked onto the click portion 103, the arms 106 will deform elastically to allow this click.

[0102] As illustrated in the views of figures 7 and 8, the stud 101 extends vertically from the upper edge 46 of the peripheral wall 10 of the bucket 9.

[0103] 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 possible only 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.

[0104] In this example, in cross-section, the stud 101 has a circular arc shape. The diameter of this circular arc is substantially identical between the lower portion 110 and the upper portion 111. To create the keying feature, the sector angle of this arc at the upper portion 11 is reduced compared to that of the lower portion.

[0105] In addition, the lateral sides 112 include a flat surface to amplify the error-proofing function.

[0106] Plot 101 may be hollow.

[0107] The stud 101 may also have elasticity to facilitate the assembly of the shell 18.

[0108] The 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 fastening members 120 configured to cooperate, through the elastic deformation of the shell 18 when the shell 18 is mounted on the bucket 9, with two corresponding fastening members 121 of the bucket 9 for the removable attachment of the shell 18 to the bucket 9.

[0109] As illustrated in the view of [Fig.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.

[0110] As illustrated in the view of [Fig. 10], the two fixing members 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.

[0111] To facilitate the assembly of the shell 18, in particular a blind assembly i.e. with an operator placed opposite the inner surface 40 of the shell 18, the half-pound 41 may include an extension 130. This extension 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 [Fig. 11].

[0112] This advance 130 extends in the continuation of the extension plane of the half-lip 41.

[0113] For example, the maximum width La at the advance is at least equal to 1.5 times the minimum transverse displacement required for mounting the shell 18 on the bucket 9.

[0114] The shell 18 may include vertical ribs 131 at the level of 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.

[0115] In this example, the projection 130 comprises two parts between which the housing 100 is formed.

[0116] 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. Demands Domestic hot water thermodynamic heating device comprising: - a water storage tank (2) extending along a main direction (X); - a bucket (9) mounted on an upper part (4) of the balloon (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 box (16) forming a side wall of box (32) and a top surface of box (20) to form at least partially with the bucket (9) the receiving space (33), the box (16) comprising a first shell (18) and a second shell (17), the first shell (18) forming a half side wall of box (30) and a half top surface of box (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 main direction (X), the first shell (18) being configured to deform elastically when mounted on the bucket (9); and in that the first shell (18) includes two lateral fixing members (120) configured to cooperate, through the elastic deformation of the first shell (18) when the first shell (18) is mounted on the bucket (9), with two corresponding fixing members (121) of the bucket (9) for the removable fixing of the first shell (18) on the bucket (9); and in that the first shell (18) comprises an inner surface (40) forming a housing (100) included between the two lateral fastening members (120) configured to cooperate with the bucket (9) and to center the first shell (18) relative to the bucket (9) when the first shell (18) is mounted on the bucket (9) for allow the first shell (18) to be mounted on the bucket (9) in a transverse plane with principal 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 mounting 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 that the centering stud (101) includes a keying system configured to ensure correct positioning relative to the principal 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 snapping, 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 error-proofing 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 that the 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 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 that the housing (100) comprises a guide portion (102), the guide portion (102) being open towards the interior 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 such that, when the first shell (18) is mounted on the bucket (9), the stud (101) passes through the guide portion (102) and then engages by snap-fit ​​with the snap-fit ​​portion (103), the interaction between the portion guide (102) and the block (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 that the first shell (18) comprises an extension (130) extending from the inner surface (40) at 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) comprises 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 said advance (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).