A slag intercepting device and a containment built-in refueling water tank

Abstract

The application discloses a containment built-in refueling water tank provided with a slag intercepting device, the refueling water tank comprises an inner ring plate and an outer ring plate, an annular water channel is formed between the inner ring plate and the outer ring plate, a plurality of slag intercepting devices are arranged at intervals in the annular water channel, the slag intercepting device comprises a device frame and a plurality of filter assemblies, the plurality of filter assemblies are located in the device frame, the filter assembly comprises a first plate, a second plate and a plurality of filter cartridges, the plurality of filter cartridges are arranged in an array state between the first plate and the second plate, a plurality of water inlets corresponding to positions of ends of the plurality of filter cartridges are formed in the first plate, the end of the filter cartridge is closed at a position where the second plate cooperates with the filter cartridge, and a water outlet is also formed in the second plate; water flows into the plurality of filter cartridges from the plurality of water inlets, the filter holes filter the water flow, and the water flow flows out of the filter assembly from the water outlet. The application can realize step-by-step interception of the slag, and improves the retention effect on the slag.

Description

Technical Field

[0001] This invention relates to the field of nuclear industry safety technology, and more specifically, to a containment refueling tank equipped with a debris interception device. Background Technology

[0002] When a high-energy pipeline rupture occurs inside the containment vessel of a nuclear power plant, the impact of the ruptured medium will damage surrounding insulation materials, paint, and other substances, forming a large amount of debris that will be transferred to the sump or internal refueling tank at the bottom of the containment vessel. After the accident, safety systems such as the emergency core cooling system and the containment spray system are put into operation. The safety system pumps need to draw water from the internal refueling tank at the bottom of the containment vessel to provide water to the pressure vessel for emergency core cooling and to provide water to the containment spray ring for cooling spraying.

[0003] To ensure water quality meets the operational requirements of the safety system, an Emergency Core Cooling System (ECCS) filter must be installed in the sump or internal refueling tank to filter various types of debris. This prevents debris from entering downstream systems and causing blockages in fuel assemblies within the pressure vessel, nozzles on the containment spray rings, or affecting the normal operation of downstream pumps, valves, heat exchangers, and other equipment. Debris accumulates on the filter screen after filtration, increasing the pressure drop resistance as water flows through the filter. This can lead to insufficient flow or cavitation problems in the safety system pumps, impacting the safety of the nuclear power plant. Therefore, the ECCS filter needs a sufficiently large screen area to ensure that the pressure drop caused by the filter and debris is less than the safety system limits, and does not affect the normal operation of downstream safety system pumps.

[0004] Prior art CN103028285B discloses an in-containment refueling tank filter system, including a debris trap installed above a hole in the upper floor slab of the in-containment refueling tank, a debris retention basket installed inside the in-containment refueling tank below the upper floor slab, and a filter installed above the pump inlet. This forms a three-stage filtration system consisting of the debris trap, the debris retention basket, and the pump inlet filter.

[0005] Prior art CN203250543U discloses a device for intercepting and storing debris, and prior art CN217902733U also discloses a multi-layer retention basket for intercepting and storing debris, which consists of a stainless steel filter assembly frame and a stainless steel perforated plate, and is a box-type structure with an open top, closed bottom, and filter screen on all sides. The above devices can initially intercept debris such as fibers and particles, reducing the amount of debris reaching the downstream ECCS filter screen.

[0006] However, in actual engineering applications, the above-mentioned debris interception devices have the following problems: 1) The devices are large in size and regular in shape, and generally require installation directly below the water inlet holes in the upper floor slab, which places high demands on the spatial layout of the nuclear power plant. 2) The devices generally adopt a flat plate filter structure, with a small filter area, which is easily clogged by debris and loses its interception effect. 3) The devices are square basket structures, which are heavy and large in size, resulting in relatively high manufacturing and installation costs.

[0007] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0008] The main objective of this invention is to provide a containment refueling tank equipped with a debris interception device to solve the problem of debris interception in the water flow channel upstream of the ECCS filter in a nuclear power plant.

[0009] To achieve the above objectives, according to one aspect of the present invention, a debris interception device is provided for installation on a water flow channel, comprising a device frame and a plurality of filter components located within the device frame. Each filter component includes a first plate and a second plate spaced apart along the water flow direction, and also includes a plurality of filter cylinders, each filter cylinder having openings at both ends and having a plurality of filter holes on its sidewalls.

[0010] The plurality of filter cartridges are arranged in an array between the first plate and the second plate, and the two ends of the filter cartridges are respectively engaged with the first plate and the second plate. The first plate has a plurality of water inlets corresponding to the end positions of the plurality of filter cartridges. The second plate closes the end of the filter cartridge at the point where it engages with the filter cartridge. The second plate also has a water outlet.

[0011] Water flows into the multiple filter cylinders from the multiple inlets, the filter holes filter out debris from the water flow, and the filtered water flows out of the filter assembly from the outlet.

[0012] Furthermore, the filter assembly also includes a front panel, which is connected to the outside of the first plate, and the front panel has multiple panel holes corresponding to the positions of the multiple water inlets.

[0013] Furthermore, the size of the water inlet is matched with the outer diameter of the filter cartridge, and the size of the panel hole is smaller than the inner diameter of the filter cartridge.

[0014] Furthermore, the second plate is provided with a plurality of positioning grooves, which are respectively inserted into the ends of the plurality of filter cylinders.

[0015] Furthermore, the filter assembly also includes a plurality of connecting beams that connect the first plate and the second plate and are located circumferentially outside the plurality of filter cylinders.

[0016] Furthermore, water can also flow out of the filter assembly from the gaps between adjacent connecting beams.

[0017] Furthermore, the first plate, the second plate, and the plurality of connecting beams form an integral structure to form the component frame of the filter assembly.

[0018] Furthermore, the plurality of filter cartridges are arranged in two or more array groups between the first plate and the second plate, and the plurality of water outlets are located between adjacent array groups.

[0019] Furthermore, the front panel has two or more, and the two or more front panels are respectively arranged corresponding to two or more array groups.

[0020] Furthermore, the front panel and the first plate are provided with a first fastener hole, and the front panel is connected to the outside of the first plate by the first fastener passing through the first fastener hole.

[0021] Furthermore, the first plate and the device frame are provided with second fastener holes, and the plurality of filter components are connected to the device frame through the second fastener holes via second fasteners.

[0022] Furthermore, the debris interception device also includes an elastic sealing sheet, which is disposed between the device frame and the wall of the water flow channel, and the elastic sealing sheet abuts against and seals the wall of the water flow channel.

[0023] Furthermore, the debris interception device also includes a movable door, which is detachably fixed to the device frame by a door fixing assembly.

[0024] Furthermore, the debris interception device also includes multiple fixed supports, which are disposed at the bottom and sides of the device frame for connection with the wall of the water flow channel.

[0025] To achieve the above objectives, according to another aspect of the present invention, an internal refueling tank for containment is provided, comprising an inner ring plate and an outer ring plate, wherein an annular water channel is formed between the inner ring plate and the outer ring plate, and a plurality of debris interception devices according to the above are spaced apart in the annular water channel.

[0026] By applying the technical solution of this invention, at least the following beneficial effects are achieved:

[0027] 1. The debris interception device of the present invention, by setting up a group of filter components, can provide a larger filter area in the same volume compared with a flat filter screen. The increased filter area can slow down the speed at which the filter screen is blocked by debris, thereby enabling the debris interception device to achieve a better interception and retention effect.

[0028] 2. The debris interception device of the present invention, through the design of the front panel and the size of the panel hole, makes the assembly of the filter cylinder in the filter assembly convenient and the structure stable. After the water flows into the filter cylinder, the debris is captured by the filter cylinder and is not easily carried away by the water flow and escaped, so that the filter assembly has a better debris retention effect.

[0029] 3. The debris interception device of the present invention is designed as a bar structure, which has the advantages of simple structure, easy manufacturing and installation, and low economic cost compared with the square basket structure. Furthermore, the design of an integrated component frame can effectively improve the mechanical strength of the filter component.

[0030] 4. The debris interception device of the present invention, through the design of an elastic sealing sheet, can easily achieve contact sealing between the device frame and the walls and ground of the water flow channel, avoiding repeated adjustments during equipment installation due to manufacturing and civil engineering errors, and reducing the amount of installation work; through the design of a movable door, it facilitates the entry and exit of personnel and goods in the nuclear power plant.

[0031] 5. The containment refill tank of the present invention achieves step-by-step interception of debris by connecting multiple debris interception devices in series in an annular waterway, thereby improving the retention effect of debris and reducing the amount of debris reaching the downstream ECCS filter. Attached Figure Description

[0032] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A front view of a debris interception device according to one embodiment is shown;

[0034] Figure 2 A schematic diagram of a filtering component according to one embodiment is shown;

[0035] Figure 3 A schematic diagram of the rear of a debris interception device according to one embodiment is shown;

[0036] Figure 4 A schematic diagram of the component framework of a filtering component according to one embodiment is shown;

[0037] Figure 5 A schematic diagram of a filter cartridge according to one embodiment is shown;

[0038] Figure 6 A schematic diagram of a debris interception device installed in a water flow channel according to one embodiment is shown;

[0039] Figure 7 A cross-sectional view of a displacement tank inside the containment vessel is shown in one embodiment.

[0040] The above figures include the following reference numerals:

[0041] 1. Device frame; 2. Filter assembly; 21. First plate; 211. Inlet; 212. Second fastener hole; 22. Second plate; 221. Outlet; 222. Positioning groove; 23. Front panel; 231. Panel hole; 232. First fastener hole; 24. Connecting beam; 3. Filter cylinder; 31. Filter hole; 4. Elastic sealing sheet; 5. Movable door; 6. Door fixing assembly; 61. First door fixing component; 62. Door bolt; 63. Second door fixing component; 7. Fixed support; 8. Inner ring plate; 9. Outer ring plate; 10. Debris interception device; 11. Annular waterway. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more. Example

[0045] This invention proposes a debris interception device that can be installed in a water flow channel. For example... Figure 1 As shown, the debris interception device includes a device frame 1 and multiple filter components 2, which are installed within the device frame 1. Water flows through the multiple filter components 2 to achieve water filtration and debris retention.

[0046] Combination Figure 2 and Figure 3 As shown, the filter assembly 2 includes a first plate 21 and a second plate 22 spaced apart along the water flow direction, and also includes multiple filter cylinders 3. The multiple filter cylinders 3 are arranged in an array between the first plate 21 and the second plate 22, and the two ends of the filter cylinders 3 are respectively engaged with the first plate 21 and the second plate 22.

[0047] like Figure 5 As shown, the filter cartridge 3 is open at both ends and has multiple densely arranged filter holes 31 on its side walls. Preferably, the filter cartridge 3 can be configured as a multi-layer structure to improve filtration efficiency.

[0048] Combination Figure 3 and Figure 4 As shown, the first plate 21 has multiple inlets 211 corresponding to the ends of multiple filter cylinders 3 respectively. The second plate 22 seals the ends of the filter cylinders 3 at the joint with the filter cylinders 3. The second plate 22 also has an outlet 221.

[0049] In this way, water flows into multiple filter cylinders 3 through multiple inlets 211, filtering out debris through filter holes 31. The filtered water then flows out of the filter assembly 2 through outlet 221. The debris interception device of this invention, by setting up grouped filter components, can provide a larger filter area within the same volume compared to a flat filter screen. The increased filter area slows down the rate at which the filter screen becomes clogged with debris, thereby achieving better interception and retention effects.

[0050] like Figure 2 As shown, the filter assembly 2 also includes a front panel 23, which is connected to the outside of the first plate 21. The front panel 23 has multiple panel holes 231 corresponding to the positions of multiple water inlets 211. The size of the water inlets 211 matches the outer diameter of the filter cartridge 3, so that the filter cartridge 3 can be installed into the filter assembly 2 through the water inlets 211.

[0051] The second plate 22 is provided with a plurality of positioning grooves 222, which are respectively inserted into the ends of a plurality of filter cartridges 3, so that each filter cartridge is accurately positioned in the filter assembly 2.

[0052] Preferably, in this embodiment, the filter cylinder 3 is cylindrical. In other embodiments, the filter cylinder 3 can also be set as a prism filter cylinder with a cross-sectional shape of square, rectangle or regular hexagon, etc. Then, the shapes of the water inlet 211 and the positioning groove 222 are also adjusted to square, rectangle or regular hexagon, etc., so as to achieve the same filtering and interception functions.

[0053] Furthermore, the size of the panel hole 231 is smaller than the inner diameter of the filter cartridge 3. The debris interception device of this invention, through the design of the front panel and the size of the panel hole, makes the assembly of the filter cartridge in the filter assembly convenient and structurally stable. After water flows into the filter cartridge, debris is captured by the filter cartridge and is not easily carried away by the water flow, thus giving the filter assembly a better debris retention effect.

[0054] In addition, the filter assembly 2 includes multiple connecting beams 24 that connect the first plate 21 and the second plate 22 and are located circumferentially outside the multiple filter cylinders 3. Water can also flow out of the filter assembly 2 from the gaps between adjacent connecting beams 24.

[0055] Preferably, the first plate 21, the second plate 22, and the multiple connecting beams 24 form an integral structure to form the component frame of the filter assembly 2. The debris interception device of the present invention, by designing a rack-type structure, has the advantages of simple structure, ease of manufacturing and installation, and low economic cost compared to a square basket structure. Furthermore, the integrated component frame design effectively improves the mechanical strength of the filter assembly.

[0056] Preferably, the multiple filter cartridges 3 are arranged in two or more array groups between the first plate 21 and the second plate 22, and the multiple water outlets 221 are located between adjacent array groups. There are two or more front panels 23, each corresponding to one or more array groups. In this embodiment, they are divided into two array groups.

[0057] Combination Figure 2 and Figure 4 As shown, both the front panel 23 and the first plate 21 are provided with first fastener holes 232. The front panel 23 is connected to the outside of the first plate 21 by passing a first fastener through the first fastener hole 232. Figure 1 As shown, both the first plate 21 and the device frame 1 are provided with second fastener holes 212, and multiple filter components 2 are connected to the device frame 1 through the second fastener holes 212.

[0058] Combination Figure 1 and Figure 6As shown, the debris interception device 10 also includes multiple fixed supports 7, which are disposed at the bottom and sides of the device frame 1 for connection with the wall of the water flow channel. Preferably, the fixed supports 7 can be used to fix the device frame 1 to the wall or the ground by anchor bolts, or they can be used to fix the device frame 1 to the wall or the ground by welding to existing embedded parts on the wall or the ground.

[0059] The debris interception device 10 also includes an elastic sealing sheet 4, which is disposed between the device frame 1 and the wall of the water flow channel, and the elastic sealing sheet 4 abuts against and seals the wall of the water flow channel. In this embodiment, elastic sealing sheets 4 are provided on both sides of the device frame 1. Preferably, the elastic sealing sheet 4 can be made of bent stainless steel sheet, with multiple round holes machined on the upper part, and can be fixed to the device frame 1 by fasteners.

[0060] By designing an elastic sealing sheet, even if there are errors in the dimensions of the device frame 1 and the water flow channel, it is possible to easily achieve a contact seal between the device frame and the walls and ground of the water flow channel, avoiding repeated adjustments during equipment installation due to manufacturing and civil engineering errors, and reducing the amount of installation work.

[0061] In addition, the debris interception device 10 also includes a movable door 5, which is detachably fixed to the device frame 1 by a door fixing assembly 6. Preferably, the door fixing assembly 6 includes a first door fixing member 61, a door bolt 62, and a second door fixing member 63. The device frame 1 is provided with a plurality of first door fixing members 61, and the movable door 5 is provided with a plurality of second door fixing members 63.

[0062] Both the first door fixing member 61 and the second door fixing member 63 have corresponding round holes. Inserting the door bolt 62 secures the first door fixing member 61 and the second door fixing member 63, thus closing the movable door 5. Removing the door bolt 62 releases the relative fixation of the first door fixing member 61 and the second door fixing member 63, thereby opening the movable door 5. The movable door 5 of the debris interception device 10 provides a passage for personnel entry and exit or for cargo transportation.

[0063] Preferably, the device frame 1 is assembled by welding steel or square tubes, and the component frame of the filter assembly 2 is also made of stainless steel plate, so that the debris interception device has sufficient mechanical strength to withstand loads such as water flow impact and earthquakes. Example

[0064] Combination Figure 6 and Figure 7As shown, this embodiment proposes an in-containment refueling tank, including an inner ring plate 8 and an outer ring plate 9, with an annular water channel 11 formed between the inner ring plate 8 and the outer ring plate 9. Multiple debris interception devices according to Embodiment 1 described above are spaced apart within the annular water channel 11. The annular water channel 11 is located upstream of the ECCS filter in the nuclear power plant.

[0065] Preferably, multiple debris interception devices 10 are spaced apart in the annular water channel 11, and the diameter of the filter hole 31 of the filter cylinder 3 of each debris interception device 10 can be reduced in turn, thereby intercepting debris of decreasing size step by step, improving the retention effect of debris, and reducing the amount of debris reaching the downstream ECCS filter.

[0066] More preferably, the height of the debris interception device 10 is lower than the wall height of the annular waterway 11. When the filter assembly is completely blocked, the water flow can overflow downstream through the top of the debris interception device 10, preventing the water from failing to reach the downstream ECCS filter and thus causing the ECCS filter to fail.

[0067] In summary, it can be seen from the above description that the embodiments of the present invention achieve the following technical effects:

[0068] 1. The debris interception device of the present invention, by setting up a group of filter components, can provide a larger filter area in the same volume compared with a flat filter screen. The increased filter area can slow down the speed at which the filter screen is blocked by debris, thereby enabling the debris interception device to achieve a better interception and retention effect.

[0069] 2. The debris interception device of the present invention, through the design of the front panel and the size of the panel hole, makes the assembly of the filter cylinder in the filter assembly convenient and the structure stable. After the water flows into the filter cylinder, the debris is captured by the filter cylinder and is not easily carried away by the water flow and escaped, so that the filter assembly has a better debris retention effect.

[0070] 3. The debris interception device of the present invention is designed as a bar structure, which has the advantages of simple structure, easy manufacturing and installation, and low economic cost compared with the square basket structure. Furthermore, the design of an integrated component frame can effectively improve the mechanical strength of the filter component.

[0071] 4. The debris interception device of the present invention, through the design of an elastic sealing sheet, can easily achieve contact sealing between the device frame and the walls and ground of the water flow channel, avoiding repeated adjustments during equipment installation due to manufacturing and civil engineering errors, and reducing the amount of installation work; through the design of a movable door, it facilitates the entry and exit of personnel and goods in the nuclear power plant.

[0072] 5. The containment refill tank of the present invention achieves step-by-step interception of debris by connecting multiple debris interception devices in series in an annular waterway, thereby improving the retention effect of debris and reducing the amount of debris reaching the downstream ECCS filter.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A containment refueling tank equipped with debris interception devices, the refueling tank comprising an inner ring plate (8) and an outer ring plate (9), an annular water channel (11) being formed between the inner ring plate (8) and the outer ring plate (9), a plurality of debris interception devices (10) being spaced apart in the annular water channel (11), each debris interception device (10) comprising a device frame (1) and a plurality of filter components (2), the plurality of filter components (2) being located within the device frame (1). Its features are, The filter assembly (2) includes a first plate (21) and a second plate (22) spaced apart along the water flow direction, and also includes a plurality of filter cylinders (3), the filter cylinders (3) being open at both ends and having a plurality of filter holes (31) on their side walls; The plurality of filter cylinders (3) are arranged in an array between the first plate (21) and the second plate (22), and the two ends of the filter cylinders (3) are respectively engaged with the first plate (21) and the second plate (22). The first plate (21) has a plurality of water inlets (211) corresponding to the end positions of the plurality of filter cylinders (3). The second plate (22) closes the end of the filter cylinders (3) at the point where it engages with the filter cylinders (3). The second plate (22) also has a water outlet (221). Water flows into the multiple filter cylinders (3) from the multiple inlets (211), the filter holes (31) filter the water debris, and the filtered water flows out of the filter assembly (2) from the outlet (221). The debris interception device (10) also includes multiple fixed supports (7), which are disposed at the bottom and sides of the device frame (1) for connection with the wall of the water flow channel.

2. The containment refueling tank equipped with a debris interception device according to claim 1, characterized in that: The filter assembly (2) also includes a front panel (23), which is connected to the outside of the first plate (21). The front panel (23) has multiple panel holes (231) corresponding to the positions of the multiple water inlets (211).

3. The containment refueling tank equipped with a debris interception device according to claim 2, characterized in that: The size of the inlet (211) is matched with the outer diameter of the filter cylinder (3), and the size of the panel hole (231) is smaller than the inner diameter of the filter cylinder (3).

4. The containment refueling tank equipped with a debris interception device according to claim 3, characterized in that: The second plate (22) is provided with a plurality of positioning grooves (222), which are respectively inserted into the ends of the plurality of filter cylinders (3).

5. The containment refueling tank equipped with a debris interception device according to any one of claims 1-4, characterized in that: The filter assembly (2) also includes a plurality of connecting beams (24) that connect the first plate (21) and the second plate (22) and are located on the circumferential outer side of the plurality of filter cylinders (3).

6. The containment refueling tank equipped with a debris interception device according to claim 5, characterized in that: Water can also flow out of the filter assembly (2) from the gap between adjacent connecting beams (24).

7. The containment refueling tank equipped with a debris interception device according to claim 5, characterized in that: The first plate (21), the second plate (22) and the plurality of connecting beams (24) are integrated into a single structure to form the component frame of the filter assembly (2).

8. The containment refueling tank equipped with a debris interception device according to claim 2, characterized in that: The plurality of filter cartridges (3) are arranged in two or more array groups between the first plate (21) and the second plate (22), and the plurality of water outlets (221) are located between adjacent array groups.

9. The containment refueling tank equipped with a debris interception device according to claim 8, characterized in that: The front panel (23) has two or more, and the two or more front panels (23) are respectively arranged corresponding to two or more array groups.

10. The containment refueling tank equipped with a debris interception device according to claim 9, characterized in that: The front panel (23) and the first plate (21) are provided with a first fastener hole (232), and the front panel (23) is connected to the outside of the first plate (21) by a first fastener passing through the first fastener hole (232).

11. The containment refueling tank equipped with a debris interception device according to claim 1, characterized in that: The first plate (21) and the device frame (1) are provided with second fastener holes (212), and a plurality of filter components (2) are connected to the device frame (1) by second fasteners passing through the second fastener holes (212).

12. The containment refueling tank equipped with a debris interception device according to claim 1, characterized in that: The debris interception device (10) further includes an elastic sealing sheet (4), which is disposed between the device frame (1) and the wall of the water flow channel, and the elastic sealing sheet (4) abuts against and seals the wall of the water flow channel.

13. The containment refueling tank equipped with a debris interception device according to claim 1, characterized in that: The debris interception device (10) also includes a movable door (5), which is detachably fixed to the device frame (1) by a door fixing assembly (6).

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