Housing for handheld XRF analyzers and the handheld XRF analyzer

Abstract

This utility model relates to a housing for a handheld XRF analyzer, comprising: a first compartment enclosing an X-ray source and a main circuit board spaced apart from the X-ray source; wherein the housing further comprises a second compartment, the second compartment comprising: a first end portion having a mounting hole for mounting a connector; a second end portion arranged opposite to the first end portion; a bottom portion extending between the first and second ends portion, wherein the depth of the first end portion is greater than that of the second end portion, causing the bottom portion to be inclined; an opening portion arranged opposite to the bottom portion; and a cover portion fitting into the opening portion, thereby forming a liquid-tight seal between the second compartment and the external environment. This housing can independently enclose the communication module in a dedicated compartment, completely isolating it from core components such as the X-ray source and the main circuit board, preventing moisture and dust from entering the core chamber. This utility model also relates to a handheld XRF analyzer.

Description

Technical Field

[0001] This utility model relates to a housing for a handheld XRF analyzer. Additionally, this utility model also relates to a handheld XRF analyzer. Background Technology

[0002] Handheld X-ray fluorescence (XRF) analyzers enable reliable elemental analysis, allowing for rapid and non-destructive on-site component detection. They provide satisfactory performance even for light elements and are widely applicable to applications such as pure metal and alloy grade identification, trace / occasional element detection, and geochemical data acquisition.

[0003] Since handheld XRF analyzers are often used in environments without wired networks, such as in the field, factories, construction sites, and waste disposal sites, users typically require the equipment to have WiFi wireless communication capabilities to enable intelligent operations such as real-time transmission of test data, remote debugging, equipment management, and data uploading to the cloud. Therefore, the industry generally desires to equip the equipment with pluggable portable communication modules to meet the needs of flexible networking, convenient replacement, and maintenance.

[0004] However, the pluggable structure creates open interfaces and assembly gaps on the analyzer housing. Under complex operating conditions, dust, water vapor, moisture, oil, and other contaminants can easily enter the equipment through the pluggable gaps, leading to problems such as poor interface contact, circuit corrosion due to moisture, short circuits of internal components, or decreased accuracy. This significantly reduces the equipment's environmental adaptability and long-term reliability, and may even cause equipment failure.

[0005] Therefore, how to effectively solve the waterproof and dustproof sealing problems of the pluggable interface while realizing the pluggable function of the communication module has become a technical challenge that urgently needs to be solved in this field. Utility Model Content

[0006] One objective of this invention is to provide a housing for a handheld XRF analyzer that allows for quick plugging and unplugging of the communication module, concealed installation, and easy replacement and maintenance, while forming a reliable liquid-tight seal for the network card installation area. This effectively prevents dust, moisture, and oil from entering the device, thereby improving the reliability and service life of the device.

[0007] According to a first aspect of the present invention, a housing for a handheld XRF analyzer is provided. The housing may include: a first compartment that encloses an X-ray source and a main circuit board spaced apart from the X-ray source; wherein the housing may further include a second compartment, the second compartment including: a first end portion having a mounting hole for mounting a connector; a second end portion arranged opposite to the first end portion; a bottom portion extending between the first and second ends portion, wherein the depth of the first end portion may be configured to be greater than the depth of the second end portion, such that the bottom portion is inclined; an opening portion arranged opposite to the bottom portion; and a cover portion that fits into the opening portion and forms a liquid-tight seal between the second compartment and the external environment.

[0008] The housing can independently enclose the communication module in a dedicated compartment, completely isolating it from core components such as the X-ray source and main circuit board, preventing moisture and dust from entering the core cabin; the sloping bottom facilitates smooth insertion and removal of the communication module and precise alignment; the cover provides overall waterproofing and dustproofing, meeting the needs of complex field environments, reducing equipment failure rate, adapting to complex field environments, and improving the overall reliability of the machine.

[0009] According to the above aspects of the present invention, preferably, the cover may include a sealing portion, which may be integrally injection molded along the periphery of the cover.

[0010] By integrally injection molding the sealing element and the cover, the sealing structure is seamless, resulting in higher sealing reliability. This arrangement enables continuous and uniform sealing pressure at the mating surfaces of the cover and the opening, achieving stable IP waterproof and dustproof performance, and improving seal life and environmental adaptability.

[0011] According to the above aspects of the present invention, preferably, the second compartment may also be provided with at least one support column, the at least one support column extending from the bottom of the compartment toward the opening and having a threaded hole; and the cover may be provided with at least one opening corresponding to at least one support column, so as to fix the cover to at least one support column via a first fastener.

[0012] This arrangement allows for stable installation of the cover, prevents loosening, improves overall sealing, and facilitates quick assembly and disassembly by the user. Additionally, the support columns provide support and limit the movement of the communication module, preventing poor contact due to shaking.

[0013] According to the above aspects of this utility model, preferably, the size of the second compartment can be set to accommodate a pluggable communication module.

[0014] This arrangement allows for independent plug-and-play replacement of communication modules without disassembling the entire device, making maintenance more convenient. It is compatible with communication modules of different frequency bands and standards, meeting diverse data transmission, remote debugging, and cloud management needs, and improving the device's versatility and scalability.

[0015] According to the above aspects of the present invention, preferably, the bottom of the second compartment is configured to form a first angle relative to the lower surface of the cover, the first angle being in the range of 10-15 degrees.

[0016] This arrangement makes the insertion direction of the communication module more ergonomic, resulting in smoother and less strenuous insertion and removal. In addition, the tilted structure facilitates automatic guidance and alignment, reduces insertion and removal force, and does not occupy extra space, which is conducive to the miniaturization and compact design of the device.

[0017] According to a second aspect of the present invention, a handheld XRF analyzer is provided. The handheld XRF analyzer may include: a housing, which may include: a first compartment; a second compartment spaced apart from the first compartment, and may include: a first end portion having a mounting hole; a second end portion arranged opposite to the first end portion; a compartment bottom extending between the first and second ends portion, wherein the depth dimension of the first end portion may be configured to be greater than the depth dimension of the second end portion, such that the compartment bottom portion is arranged at an angle; an opening portion arranged opposite to the compartment bottom portion; a cover portion fitting into the opening portion and forming a liquid-tight seal between the second compartment and the external environment; an X-ray source disposed in the first compartment; a main circuit board disposed in the first compartment; a connector mounted into the mounting hole in the second compartment and connected to the main circuit board; and a communication module disposed in the second compartment and connected to the connector.

[0018] This handheld XRF analyzer, through its independently sealed, tilted second compartment, retains the advantages of a pluggable and easy-to-maintain communication module while achieving excellent waterproof, dustproof, and oil-proof performance. It effectively solves the problem of existing pluggable network cards being prone to water and dust ingress, leading to malfunctions. It is particularly suitable for harsh environments such as the field, factory areas, and construction sites, significantly improving the reliability, stability, and service life of the handheld XRF analyzer.

[0019] According to the above aspects of the present invention, preferably, the connector can be a waterproof connector to form a liquid-tight seal between the first compartment and the second compartment.

[0020] This waterproof connector and cover form a double waterproof protection, further improving the overall waterproof reliability of the machine and protecting the X-ray source and main circuit board.

[0021] According to the above aspects of the present invention, preferably, the connector can be fixed to the mounting hole at the first end via a second fastener.

[0022] This ensures that the waterproof connector is securely installed and accurately positioned, preventing the connector from becoming loose or shifting when plugging or unplugging the communication module; it also ensures a tight seal between the connector and the mounting hole, preventing water and air leakage from gaps, and improving structural stability and sealing reliability.

[0023] According to the above aspects of the present invention, preferably, the handheld XRF analyzer may further include a detector disposed at a first end of the housing, and a display disposed at a second end of the housing, the second end being opposite to the first end, wherein the second compartment is positioned above the first compartment and close to the display.

[0024] This compact and rational layout makes full use of the internal space of the casing, which is conducive to the miniaturization of the device. In addition, the second compartment is close to the display and far away from the X-ray source and the main heat-generating area, which improves heat dissipation, avoids electromagnetic interference, and facilitates user operation by opening the cover and plugging in / out.

[0025] According to the above aspects of the present invention, preferably, the bottom of the second compartment is configured to form a first angle relative to the lower surface of the cover, the first angle being in the range of 10-15 degrees.

[0026] Similarly, this arrangement makes the operation of handheld XRF analyzers (such as the plugging and unplugging of communication modules) more ergonomic, which is conducive to the miniaturization and compact design of the equipment.

[0027] Therefore, the housing for the handheld XRF analyzer and the handheld XRF analyzer of this invention overcome the shortcomings of the prior art and achieve the intended purpose. Attached Figure Description

[0028] To further illustrate the housing for a handheld XRF analyzer according to the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, in which:

[0029] Figure 1 This is a schematic perspective view of a handheld XRF analyzer according to a non-limiting embodiment of the present invention;

[0030] Figure 2 This is a schematic partially exploded perspective view of a handheld XRF analyzer according to a non-limiting embodiment of the present invention;

[0031] Figure 3 This is a schematic cross-sectional view of a handheld XRF analyzer according to a non-limiting embodiment of the present invention;

[0032] Figure 4 yes Figure 3 An enlarged view of a portion of the handheld XRF analyzer shown;

[0033] Figure 5 This is another schematic perspective view of a handheld XRF analyzer according to a non-limiting embodiment of the present invention, wherein the cover has been removed;

[0034] Figure 6 This is a schematic perspective view of a portion of a handheld XRF analyzer according to a non-limiting embodiment of the present invention, wherein the cover has been removed; and

[0035] Figure 7 This is a schematic perspective view of the cover of a handheld XRF analyzer according to a non-limiting embodiment of the present invention.

[0036] The above figures are for illustrative purposes only and are not drawn to scale.

[0037] The reference numerals in the figures are listed in the figures and embodiments:

[0038] 1000 - Handheld XRF Analyzer, including:

[0039] 100 - Housing, comprising:

[0040] 100A - Grip section;

[0041] 100B – Main body;

[0042] 110 – First end;

[0043] 120 – Second end;

[0044] 10 - First compartment;

[0045] 20 – Second compartment, comprising:

[0046] 21 – First end;

[0047] 22 – Second end;

[0048] 23 - Bottom of compartment;

[0049] 24 – Opening;

[0050] 25 – Support column;

[0051] 30 - Covering components, including:

[0052] 30A – Lower surface;

[0053] 30B – Top surface;

[0054] 31 - Sealing part;

[0055] 32 - Opening;

[0056] 40 – First fastener;

[0057] 50 – Second fastener;

[0058] 200-X-ray source;

[0059] 300 - Main circuit board;

[0060] 400 - Connector;

[0061] 500 - Communication Module;

[0062] 600 – Detector;

[0063] 700 - Monitor;

[0064] α – First angle;

[0065] X – Longitudinal axis. Detailed Implementation

[0066] It should be understood that, unless explicitly stated otherwise, the present invention may employ various alternative orientations and sequences of steps. It should also be understood that the specific devices shown in the drawings and described in the specification are merely exemplary embodiments of the inventive concept disclosed and defined herein. Therefore, unless expressly stated otherwise, the specific orientations, directions, or other features involved in the various disclosed embodiments should not be considered limiting.

[0067] A handheld XRF analyzer uses primary X-rays emitted from an X-ray source to irradiate the sample, causing the elements in the sample to be excited and emit characteristic X-ray fluorescence. The energy or intensity of this fluorescence can then be received and detected by a detector, thereby enabling qualitative and quantitative analysis of the types and contents of elements in the sample.

[0068] Figure 1 This is a schematic perspective view of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention; and Figure 2 This is a schematic partially exploded perspective view of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention.

[0069] As shown in the figure and as a non-limiting embodiment, the handheld XRF analyzer 1000 may include a housing 100, which may generally have a pistol-shaped construction, having a grip portion 100A and a main body portion 100B. The grip portion 100A facilitates handheld operation by an operator, while the main body portion 100B may accommodate and / or attach various functional components.

[0070] In some embodiments, the housing 100 may be made of any suitable material, including but not limited to various composite non-metallic materials, metallic materials, and any combination thereof.

[0071] Figure 3 This is a schematic cross-sectional view of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention; and Figure 4 yes Figure 3 An enlarged view of a portion of the handheld XRF analyzer 1000 shown.

[0072] As shown in the figure, the handheld XRF analyzer 1000 may also include an X-ray source 200, a main circuit board 300, a connector 400, a communication module 500, a detector 600, and a display 700.

[0073] The structure of the housing 100 will now be described with reference to the accompanying drawings. Figure 3 As schematically shown, the housing 100 may include a first compartment 10 and a second compartment 20 spaced apart from the first compartment 10. As an example, the first compartment 10 may be located below the second compartment 20, and the volume of the first compartment 10 may be greater than the volume of the second compartment 20.

[0074] In the embodiment shown in the accompanying drawings, the first compartment 10 may enclose the X-ray source 200 and the main circuit board 300 spaced apart from the X-ray source 200. In a preferred embodiment, the larger electronic components (e.g., power management modules, capacitors, etc.) of the main circuit board 300 may be arranged facing the X-ray source 200, thereby leaving upper space for the second compartment 20.

[0075] The second compartment 20 can be integrally formed into a wedge-shaped space, and the dimensions of the second compartment 20 are configured to accommodate the pluggable communication module 500. Therefore, the second compartment 20 can also be referred to as a communication module compartment. According to an embodiment of the present invention, the communication module 500 can be provided with a corresponding interface, such as a USB interface, to achieve quick pluggable connection.

[0076] In the embodiment shown in the accompanying drawings, the second compartment 20 may include: a first end 21, an opposing second end 22, a compartment bottom 23, and an opposing opening 24.

[0077] The first end 21 may be the right end shown in the accompanying drawings. Preferably, the first end 21 may be provided with a mounting hole for mounting the connector 400. Additionally, as... Figure 4 As schematically shown, connector 400 can be connected to main circuit board 300, for example, via corresponding cables. Additionally, connector 400 may be provided with a mating connection interface, such as a USB interface, to allow for quick and reliable plug-and-play connection of communication module 500.

[0078] As used herein, the term "communication module" can refer to a functional module that enables the handheld XRF analyzer 1000 to communicate with external devices. Examples of external devices may include remote terminals such as remote computers, smartphones, tablets, cloud servers, etc. In some embodiments, the communication module may be a WiFi network card, a 3G / 4G / 5G communication network card, a SIM card communication module, a 6G communication network card, etc.

[0079] As a preferred embodiment, connector 400 can be a waterproof connector to form a liquid-tight seal between the first compartment 10 and the second compartment 20.

[0080] As used herein, the term "liquid seal" can refer to a continuous closed interface formed by the mating structure between components through sealing elements or sealing parts, compression structures or integrated molding methods, which can prevent liquid water, water vapor, moisture, dust or oil from the external environment from entering the housing 100, especially preventing liquid water, water vapor, moisture, dust or oil from entering the first compartment 10, so that the internal space and the external environment form a leak-proof and airtight seal, so as to ensure that the equipment can work reliably under complex working conditions such as humidity, dust, and oil.

[0081] The second end 22 can be the left end shown in the attached figure. As shown and by way of example, the depth or height dimension of the first end 21 can be configured to be greater than the height or depth dimension of the second end 22. In this way, the right half of the space of the second compartment 20 can be larger than the left half.

[0082] The bottom 23 of the compartment may extend between the first end 21 and the second end 22, and the bottom 23 of the compartment may be arranged at an angle. For example, as shown in the figure, the bottom 23 of the compartment may be angled downward to the right.

[0083] As an example, the bottom 23 of the second compartment 20 may form a first angle α relative to the lower surface 30A of the cover 30, which may be in the range of 10-15 degrees. Preferably, the first angle α is 12.29 degrees. In some embodiments, the bottom 23 of the compartment may be arranged parallel to the main circuit board 300.

[0084] exist Figure 3 The figure also shows an exemplary arrangement of the detector 600 and the display 700. As shown, the detector 600 can be arranged on the front side or the first end 110 of the main body portion 100B of the housing 100, and adjacent to the X-ray source 200, for receiving the characteristic X-ray fluorescence generated after the object under test is excited, in order to obtain information on the energy or intensity of the fluorescence.

[0085] The display 700 can be arranged opposite to the detector 600 at the rear side or the second end 120 of the main body portion 100B of the housing 100. In this way, the display 700 can face the operator during use.

[0086] According to an embodiment of the present invention, the front and rear sides of the housing 100 can be opposite sides arranged along the longitudinal axis X, and can be the front and rear sides relative to the operator. For example, during use of the handheld XRF analyzer 1000, the rear side can be positioned close to the operator.

[0087] As a preferred embodiment, the second compartment 20 is positioned above the first compartment 10 and close to the display 700. For example, the second compartment 20 may be at least partially located below the display 700.

[0088] Figure 5 This is another schematic perspective view of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention, wherein the cover 30 has been removed; and Figure 6 This is a schematic perspective view of a portion of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention, wherein the cover 30 has been removed.

[0089] As shown in the figure, the opening 24 can be positioned opposite to the bottom 23 of the compartment, allowing the interior space of the second compartment 20 to be completely open. Preferably, the opening 24 can have a stepped portion, such that the circumferential dimension of the opening 24 is larger than the circumferential dimension of the second compartment 20, which provides sufficient installation space for the cover 30.

[0090] like Figure 5 and 6 As schematically shown, connector 400 can be secured to the mounting hole of first end 21 via second fastener 50. As an example, two second fasteners 50 may be provided and may be arranged diagonally on both sides of connector 400.

[0091] Additionally, as shown in the figure and in a preferred embodiment, the second compartment 20 may also be provided with at least one support post 25. In the embodiment shown in the figure, the housing 100 may be provided with four support posts 25, and the four support posts 25 may be arranged symmetrically spaced apart from each other, for example, arranged at the four corners of a generally rectangular shape. Each support post 25 extends from the bottom 23 of the compartment toward the opening 24 and is provided with a threaded hole. Thus, as in a preferred embodiment and as shown in the figure... Figure 5 As schematically shown, the communication module 500 can be placed in the space formed by four support columns 25.

[0092] It should be understood that the number and arrangement of the support columns 25 shown in the accompanying drawings are merely schematic, and those skilled in the art may use other combinations of numbers and shapes as needed.

[0093] like Figure 2-4 As schematically shown, the housing 100 also includes a cover 30. The cover 30 can fit into the opening 24 and form a liquid-tight seal between the second compartment 20 and the external environment.

[0094] Figure 7 This is a schematic perspective view of the cover 30 of a handheld XRF analyzer 1000 according to a non-limiting embodiment of the present invention.

[0095] As shown in the figure and as an example, the cover 30 can be integrally formed into a generally plate-like structure and includes a lower surface 30A and an opposing upper surface 30B. Preferably, the lower surface 30A may include a plurality of reinforcing ribs that are interlaced with each other, and the surfaces of these ribs form the lower surface 30A.

[0096] The cover 30 may include a sealing portion 31, which may be integrally injection molded along the periphery of the cover 30. In some embodiments, the sealing portion 31 may be an integrally injection molded soft rubber structure to achieve a liquid-tight seal or a waterproof seal.

[0097] The cover 30 may be provided with at least one opening 32 corresponding to at least one support post 25, for example, four openings 32 as shown in the figure, to secure the cover 30 to at least one support post 25 via a first fastener 40. As an example, the first fastener 40 may be an anti-loosening screw to facilitate quick installation and removal by the user.

[0098] In this way, the communication module can be concealed and stored in a sealed compartment below the top of the device. Compared to an exposed installation structure, the housing according to this invention can effectively prevent damage to the network card and prevent liquid ingress, thus improving the overall protection performance of the device.

[0099] As a preferred embodiment and as Figure 1 and 3 As schematically shown, after the cover 30 is installed into the opening 24, the upper surface 30B of the cover 30 can be recessed relative to the top of the housing 100. For example, as shown, the front side of the upper surface 30B of the cover 30 can be lower than the surface of the top of the housing 100, and the rear side of the upper surface 30B of the cover 30 can be aligned with the surface of the top of the housing 100, thereby forming a structure that is lower in the front and higher in the back.

[0100] The terms “bottom” and “top” used herein to indicate orientation or location, and “first” and “second” used to indicate sequence, are merely to enable those skilled in the art to better understand the concept of the present invention as shown in the preferred embodiments, and are not intended to limit the present invention. Unless otherwise stated, all sequences, orientations, or locations are used only to distinguish one element / component / structure from another, and do not indicate any particular order, sequence of operations, direction, or orientation unless otherwise stated. For example, in an alternative embodiment, “first end” could be “second end”, etc.

[0101] As used herein, unless otherwise specified, the terms “approximately” and “about” are interpreted as indicating a value or range of values ​​plus or minus five percent, or a deviation of the shape and / or position from the value by plus or minus five percent.

[0102] In summary, the housing 100 and handheld XRF analyzer 1000 of the present invention overcome the shortcomings of the prior art and achieve the intended purpose.

[0103] While the housing for a handheld XRF analyzer and the handheld XRF analyzer of this invention have been described above with reference to preferred embodiments, those skilled in the art should recognize that the above examples are merely illustrative and should not be construed as limiting the invention. Therefore, various modifications and variations can be made to this invention within the spirit and scope of the claims, and all such modifications and variations will fall within the scope claimed by the claims.

Claims

1. A housing (100) for a handheld XRF analyzer, the housing (100) comprising: The first compartment (10) encloses the X-ray source (200) and the main circuit board (300) spaced apart from the X-ray source (200). The feature is that the housing (100) further includes a second compartment (20). The second compartment (20) includes: The first end (21) is provided with a mounting hole for mounting a connector (400). The second end (22) is arranged opposite to the first end (21); The compartment bottom (23) extends between the first end (21) and the second end (22), wherein the depth dimension of the first end (21) is configured to be greater than the depth dimension of the second end (22), such that the compartment bottom (23) is arranged at an angle; and An opening (24) is disposed opposite to the bottom (23) of the compartment; and A cover (30) fits into the opening (24) and creates a liquid-tight seal between the second compartment (20) and the external environment.

2. The housing (100) according to claim 1, characterized in that The cover (30) includes a sealing portion (31) integrally injection molded along the periphery of the cover (30).

3. The housing (100) according to claim 1, characterized in that The second compartment (20) is further provided with at least one support column (25), which extends from the bottom (23) of the compartment toward the opening (24) and is provided with a threaded hole; and The cover (30) is provided with at least one opening (32) corresponding to the at least one support post (25) for securing the cover (30) to the at least one support post (25) via a first fastener (40).

4. The housing (100) according to any one of claims 1-3, characterized in that The second compartment (20) is sized to accommodate a pluggable communication module (500).

5. The housing (100) according to any one of claims 1-3, characterized in that The bottom (23) of the second compartment (20) is configured to form a first angle (α) relative to the lower surface (30A) of the cover (30), the first angle being in the range of 10-15 degrees.

6. A hand-held XRF analyzer (1000) characterized by, The handheld XRF analyzer includes: Housing (100), the housing (100) comprising: First compartment (10); A second compartment (20), spaced apart from the first compartment (10), and comprising: The first end (21) is provided with a mounting hole; The second end (22) is arranged opposite to the first end (21); The compartment bottom (23) extends between the first end (21) and the second end (22), wherein the depth dimension of the first end (21) is configured to be greater than the depth dimension of the second end (22), such that the compartment bottom (23) is arranged at an angle; and An opening (24) is disposed opposite to the bottom (23) of the compartment; and A cover (30) fits into the opening (24) and forms a liquid-tight seal between the second compartment (20) and the external environment; An X-ray source (200) is disposed in the first compartment (10); A main circuit board (300) is disposed in the first compartment (10); Connector (400), which is installed into the mounting hole in the second compartment (20) and connected to the main circuit board (300); and A communication module (500) is disposed in the second compartment (20) and connected to the connector (400).

7. The handheld XRF analyzer (1000) of claim 6, wherein, The connector (400) is a waterproof connector to form a liquid-tight seal between the first compartment (10) and the second compartment (20).

8. The handheld XRF analyzer (1000) of claim 6, wherein, The connector (400) is secured to the mounting hole of the first end (21) via a second fastener (50).

9. The handheld XRF analyzer (1000) of claim 6, wherein, Also includes: A detector (600) is disposed at a first end (110) of the housing (100); as well as A display (700) is disposed at a second end (120) of the housing (100), the second end (120) being opposite to the first end (110). The second compartment (20) is positioned above the first compartment (10) and close to the display (700).

10. The handheld XRF analyzer (1000) according to any one of claims 6-9, characterized in that, The bottom (23) of the second compartment (20) is configured to form a first angle (α) relative to the lower surface (30A) of the cover (30), the first angle being in the range of 10-15 degrees.

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