Modular filtration device for painting booths and automotive parts painting booths

Abstract

The utility model relates to the technical field of spray room filtering system especially, a kind of modular filter device and automobile accessory spray room for spray room, including frame and filter module, frame is fixed in spray room, filter module is fixedly connected on frame, and frame is formed with several compartments;Filter module and compartment position one-to-one correspondence, and including chassis, filter core, press frame and locking piece, its beneficial effect is that press frame can selectively press tightly fixed between press frame and chassis, when needing to maintain filter core, only need to swing press frame to switch to disengagement state, and do not need to separate press frame and chassis completely, so it is not necessary to consider the storage problem of press frame, it is favorable to improve the convenience when maintaining filter core, improve maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of spray booth filtration systems, and in particular to a modular filtration device for spray booths and a spray booth for automotive parts. Background Technology

[0002] Spray booths are specialized equipment spaces used for spray painting operations, widely applied in industries such as automotive, furniture, and machinery manufacturing. The spraying process generates a large amount of paint mist and harmful particulate matter, thus requiring a high-efficiency air filtration system to ensure spray quality, operator health, and environmental protection. Traditional spray booths typically use integrated filtration devices, which are complex to install and replace, have low maintenance efficiency, and struggle to guarantee uniform airflow distribution within the booth. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a modular filtration device for spray booths and a spray booth for automotive parts, which solves the technical problems of existing filtration devices being mostly integral structures, with complex filter element installation and replacement processes and low maintenance efficiency.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] In a first aspect, this utility model provides a modular filtration device for a spray booth, comprising a frame and a filtration module. The frame can be fixed inside the spray booth, and the filtration module is fixedly connected to the frame. Several slots are formed on the frame. The filtration module corresponds one-to-one with the slot positions and includes a base frame, a filter element, a pressing frame, and a locking component. The base frame is detachably fixedly connected to the slot positions of the frame. The pressing frame can switch between a pressed state with the base frame and a detached state away from the base frame, and is connected to the base frame. The locking component can lock the pressing frame and the base frame in the pressed state. In the pressed state, the filter element can be pressed between the pressing frame and the base frame, and the pressing frame, the filter element, and the base frame form a filtration channel.

[0008] In one technical solution of this utility model, the filter module further includes a mesh sheet, which is connected to the base frame to form a first support for the filter element, and the filter element can be pressed between the mesh sheet and the pressing frame.

[0009] In one technical solution of this utility model, the filter module further includes a connecting positioning component fixedly connected to the base frame, and the connecting positioning component can be detachably fixed to the frame.

[0010] In one technical solution of this utility model, a first sealing element is also provided between the filter module and the grid frame; the lower surface of the base frame and the upper surface of the frame are mutually cooperating sealing surfaces, and the first sealing element can be pressed between the two sealing surfaces.

[0011] In one technical solution of this utility model, the filter module further includes a second sealing element disposed on the outer edge of the filter element, and a sealing groove adapted to the second sealing element is provided on the base frame.

[0012] In one technical solution of this utility model, the locking component is a rotary eccentric lock, and each eccentric lock includes a handle; when multiple eccentric locks are set, the handles of the multiple eccentric locks whose positions are parallel to the swing axis of the clamping frame are linked together through a connecting rod.

[0013] In one technical solution of this utility model, the locking component includes a magnet and a positioning pin that are respectively fixedly connected to the clamping frame and the base frame. In the clamping state, the magnet and the positioning pin attract each other magnetically so that the two lock the clamping frame and the base frame.

[0014] In one technical solution of this utility model, both the filter module and the grid are rectangular.

[0015] Secondly, this utility model provides an automotive parts spray booth, including the modular filtration device for spray booths in any of the above technical solutions. The frame divides the internal space of the spray booth into an upper filtration chamber and a lower working chamber. Air can flow from the upper filtration chamber through the filtration module to the lower working chamber. The upper filtration chamber is the top layer of the spray booth.

[0016] In one technical solution of this utility model, a negative pressure pump and a pipeline are also included. The inlet end of the negative pressure pump is located in the lower working chamber, and the two ends of the pipeline are respectively connected to the outlet end of the negative pressure pump and the upper filter chamber.

[0017] (III) Beneficial Effects

[0018] The beneficial effects of this utility model are: the modular filtration device for the spray booth of this utility model has each filter module fixedly connected to the frame in a detachable manner, which facilitates maintenance and replacement. Multiple slots are opened on the surface of the frame according to a certain layout, and each slot corresponds to the installation of an independent filter module, thus ensuring the uniformity of the air output by the filtration device within the spray booth.

[0019] The base frame, as the foundation of the module, can be securely installed in the corresponding slot of the frame via snap-fit, bolts, or other detachable methods, ensuring a firm connection between the entire module and the frame while facilitating easy assembly and disassembly. The clamping bracket can selectively clamp and fix the filter element between the clamping bracket and the base frame. When filter element maintenance is required, simply swing the clamping bracket to the detached state; there is no need to completely separate the clamping bracket from the base frame. Therefore, there is no need to consider the storage of the clamping bracket, which improves the convenience and efficiency of filter element maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the spray booth and modular filtration device of this utility model;

[0021] Figure 2 This is a top view of the frame structure of this utility model;

[0022] Figure 3 This is one of the structural schematic diagrams of the filtering module in one embodiment of the present invention;

[0023] Figure 4 This is one of the structural schematic diagrams of the filter module in another embodiment of the present invention;

[0024] Figure 5 This is a second schematic diagram of the structure of the filtering module in one embodiment of the present invention.

[0025] [Explanation of Labels in the Attached Image]

[0026] 100: Spray booth; B: Upper filter chamber; C: Lower working chamber;

[0027] 1: Frame; A: Grid;

[0028] 2: Filter module; 21: Base frame; 22: Filter element; 23: Pressing frame; 24: Locking component; 241: Handle; D: Connecting rod;

[0029] 25: Mesh panel; 26: Connecting and positioning components;

[0030] 3: Negative pressure pump;

[0031] 4: Pipes. Detailed Implementation

[0032] To better explain and facilitate understanding of this utility model, the following description is provided in conjunction with the appendix. Figures 1-5 This invention will be described in detail through specific embodiments. Wherein, directional terms such as "upper" and "lower" are used in this document. Figure 1 The orientation is used as a reference.

[0033] Example 1:

[0034] Reference Figures 1-5 This utility model provides a modular filtration device for a spray booth, including a frame 1 and a filter module 2. The frame 1 is fixed inside the spray booth 100, and the filter module 2 is fixedly connected to the frame 1. A plurality of slots A are formed on the frame 1. The filter module 2 corresponds one-to-one with the slot A and includes a base frame 21, a filter element 22, a pressing frame 23, and a locking member 24. The base frame 21 is detachably fixedly connected to the slot A position of the frame 1. The pressing frame 23 can switch between a pressed state that presses against the base frame 21 and a detached state that moves away from the base frame 21, and is connected to the base frame 21. The locking member 24 can lock the pressing frame 23 and the base frame 21 in the pressed state. In the pressed state, the filter element 22 can be pressed between the pressing frame 23 and the base frame 21, and the pressing frame 23, the filter element 22, and the base frame 21 constitute a filtration channel.

[0035] In this embodiment, each filter module 2 is detachably fixed to the frame 1 for easy maintenance and replacement. The surface of the frame 1 has multiple slots A arranged in a specific layout, and each slot A corresponds to the installation of an independent filter module 2, ensuring the uniformity of the air output from the filter device within the spray booth 100.

[0036] The base frame 21, as the foundation of the module, can be securely installed in the corresponding slot A position of the frame 1 through snap-fit, bolts, or other detachable methods, thus ensuring a firm connection between the entire module and the frame 1 and easy assembly and disassembly. The clamping frame 23 can selectively clamp and fix the filter element 22 between the clamping frame 23 and the base frame 21. When it is necessary to maintain the filter element 22, it is only necessary to swing the clamping frame 23 to the detached state, without completely separating the clamping frame 23 from the base frame 21. Therefore, there is no need to consider the storage problem of the clamping frame 23, which helps to improve the convenience and efficiency of maintaining the filter element 22.

[0037] The locking element 24 can reliably lock the clamping frame 23 and the base frame 21 to prevent them from opening accidentally, thereby ensuring that the filter element 22 is stably clamped between the two and ensuring the filtration effect.

[0038] Both filter module 2 and grid A are rectangular. This design improves the regularity of the filtration device, facilitates efficient space utilization, allows multiple filter modules 2 to be arranged neatly and compactly on frame 1, and also facilitates standardized production and modular replacement. Because the rectangular edges are regular, they are easy to process and position. During use with the sealing surface and connecting positioning parts 26, the fit and consistency between filter module 2 and frame 1 are effectively guaranteed, reducing installation loosening or airflow leakage problems caused by shape deviations.

[0039] Furthermore, the rectangular structure ensures more even force distribution during the clamping process of the clamping frame 23, which helps improve the working efficiency and stability of the locking component 24. It also facilitates the arrangement and operation of components such as the magnetic locking assembly and the eccentric locking linkage rod. Overall, the rectangular structure of the filter module 2 and the grid A design not only enhances the functionality and practicality of the device but also provides strong support for the modular and integrated development of the air filtration system within the spray booth 100.

[0040] Example 2:

[0041] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0042] The filter module 2 also includes a mesh 25, which is connected to the base frame 21 to form a first support for the filter element 22. The filter element 22 can be pressed between the mesh 25 and the pressing frame 23.

[0043] In this embodiment, the mesh 25 is used to support the bottom of the filter element 22. Structurally, the mesh 25 has sufficient strength to effectively support the weight of the filter element 22 itself and the pressure it experiences under airflow, without affecting normal air circulation.

[0044] By integrating the mesh 25 onto the base frame 21 as a support structure for the filter element 22, and cooperating with the clamping frame 23 to achieve bidirectional clamping and fixing of the filter element 22, this solution effectively improves the overall structural rationality and functionality of the filter module 2, enhances the reliability of the filter element 22 and the convenience of its replacement, and provides a strong guarantee for the efficient and stable operation of the air filtration system of the spray booth 100.

[0045] In addition, the mesh 25 itself can be made of metal or high-strength non-metallic materials with certain strength and corrosion resistance to adapt to the high temperature, high humidity or chemically corrosive environment that may exist in the spray booth 100.

[0046] Figure 5 The image shows only a portion of the filter element 22. In reality, the filter element 22 is a single piece of material, and its shape matches the mesh 25. The clamping frame 23 can be a grid-shaped structure to evenly clamp the filter element 22.

[0047] Example 3:

[0048] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0049] The filter module 2 also includes a connecting positioning component 26 fixedly connected to the base frame 21, and the connecting positioning component 26 can be detachably fixed to the frame 1.

[0050] In this embodiment, the design of the connecting positioning component 26 not only ensures the connection stability between the filter module 2 and the frame 1, but also plays a role in rapid positioning and guidance, making the filter module 2 more accurate and convenient during installation.

[0051] Specifically, the connecting positioning component 26 can be configured as a connecting ear. When the filter module 2 is installed into the corresponding slot A position of the frame 1, the connecting positioning component 26 and the preset installation structure on the frame 1, such as the mounting hole, cooperate with each other to achieve quick alignment and locking. This connection method ensures the stability of the filter module 2 during operation and also meets the requirements of convenient operation when frequently replacing or maintaining it.

[0052] Example 4:

[0053] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0054] The modular filtration device for the spray booth also includes a first seal between the filter module 2 and the frame 1 to prevent air from entering the lower chamber C without filtration, thereby improving the reliability of the filtration device.

[0055] The lower surface of the base frame 21 and the upper surface of the frame 1 are mutually mating sealing surfaces, and the first seal can be pressed between the two sealing surfaces.

[0056] Once filter module 2 is installed, the first seal will be clamped and pressed between the two sealing surfaces, forming an effective airtight barrier. This seal can be made of an elastic material, such as rubber or silicone, which has good compression resilience and durability, and can maintain a stable sealing effect during long-term operation.

[0057] By setting the first sealing element and optimizing the design of the sealing mating surface, not only is the overall airtightness of the filtration device effectively improved, but the stability and reliability of the filtration system are also further enhanced, ensuring that all air entering the lower working space is treated by high-efficiency filtration, meeting the high standard requirements of the spray booth 100 for environmental cleanliness.

[0058] The outline dimensions of the base frame 21 are set to be greater than or equal to the outline dimensions of the grid A, preferably about 20mm greater than the outline dimensions of the grid A, so that the sealing surface has sufficient area, thereby improving the sealing performance.

[0059] When installing the filter module, filter module 2 is located on top of frame 1. Simply stack the filter modules and fix them onto slot A of frame 1 to complete the installation of filter module 2.

[0060] Example 5:

[0061] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0062] The filter module 2 also includes a second sealing element located on the outer edge of the filter element 22, and a sealing groove adapted to the second sealing element is provided on the base frame 21.

[0063] In this embodiment, the second seal is used to prevent air from bypassing and leaking through the gap between the filter element 22 and the base frame 21, thereby preventing unfiltered air from entering subsequent processes and affecting the air quality inside the spray booth 100.

[0064] To achieve a good sealing fit, a sealing groove matching the shape of the second seal is provided on the base frame 21. When the filter element 22 is installed on the base frame 21 and is in a compressed state, the second seal is embedded in the sealing groove, forming a tight-fitting sealing connection between the two, thereby effectively preventing the possibility of air bypassing the filter element 22.

[0065] The second seal can be made of a material with good elasticity and durability, such as rubber, silicone, or other elastomer materials suitable for industrial environments, which can maintain stable sealing performance during long-term use.

[0066] Example 6:

[0067] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0068] The locking component 24 is a rotary eccentric lock, and each eccentric lock includes a handle 241. When multiple eccentric locks are set, the handles 241 of the multiple eccentric locks whose positions are parallel to the swing axis of the clamping frame 23 are linked together through the connecting rod D.

[0069] In this embodiment, the rotary eccentric locking structure features simple operation and reliable locking. Each eccentric lock is equipped with a handle 241, facilitating manual opening or closing by the operator. When the filter module 2 is in the compressed state, rotating the handle 241 drives the eccentric lock to rotate, and the displacement generated by its eccentric structure securely locks the pressing frame 23 to the base frame 21, ensuring that the filter element 22 and the mesh 25 will not loosen during operation.

[0070] To improve operational efficiency and ensure synchronized operation of multiple latches, the handles 241 of adjacent eccentric latches are linked together via a connecting rod D. This allows for simultaneous rotation of all linked latches by operating only one handle 241, completing the locking or releasing process between the clamping frame 23 and the base frame 21 in one operation. This linkage structure not only simplifies operation and reduces manual intervention but also effectively avoids safety hazards caused by incomplete locking of individual latches, further enhancing the stability and safety of the entire filter module 2 during use and improving the overall engineering applicability and ease of maintenance of the equipment.

[0071] Example 7:

[0072] Reference Figures 1-5 In addition to possessing all the technical solutions of the above embodiments, the embodiments of this utility model further possess the following technical solutions:

[0073] The locking component 24 includes a magnet and a positioning pin that are respectively fixedly connected to the clamping frame 23 and the base frame 21. In the clamping state, the magnet and the positioning pin attract each other, which improves the locking speed and locking convenience.

[0074] In this embodiment, the magnet can be embedded or fixedly installed on the inner surface of the clamping frame 23, while the positioning pin is set at the corresponding position on the base frame 21. The positioning pin can be made of ferromagnetic metal or other materials that can generate a stable attraction force with the magnet. When the clamping frame 23 is pressed down to the base frame 21 and approaches the clamping state, a magnetic attraction force is formed between the magnet and the positioning pin, providing additional pressing force and stability, further enhancing the tightness of the fit between the two, and preventing accidental opening due to vibration or airflow disturbance.

[0075] Furthermore, the combination of the magnet and the positioning pin not only provides excellent self-centering, helping the clamping frame 23 to automatically calibrate its position during closure, but also improves operational convenience and connection reliability without requiring a complex mechanical locking structure. This magnetic locking method can be used alone, in conjunction with the aforementioned eccentric locking linkage structure, or independently to construct a multi-locking mechanism, thereby enhancing the overall safety and stability of the device.

[0076] Example 8:

[0077] refer to Figure 1 The present invention provides an automotive parts spray booth, including the modular filtration device for spray booths in any of the above embodiments. The frame 1 divides the internal space of the spray booth 100 into an upper filtration chamber B and a lower working chamber C. Air can flow from the upper filtration chamber B through the filtration module 2 to the lower working chamber C. The upper filtration chamber B is the top layer of the spray booth 100.

[0078] In this embodiment, the frame 1 not only serves as the mounting base for the filter module 2, but also acts as a divider within the spray booth 100, dividing it into two functional areas: an upper filter chamber and a lower working space. The upper filter chamber B is located at the top of the spray booth 100 and serves as the starting point of the air purification system. Air enters this area and is purified by the various filter modules 2. The filtered air then flows downwards into the lower working area to maintain the clean environment required for spraying operations within the spray booth 100.

[0079] This structural design makes full use of the space layout of the spray booth 100, making the airflow path more rational and helping to improve overall ventilation and filtration efficiency. Meanwhile, the modular arrangement of the upper filter chamber B, as a key part of the entire air circulation system, facilitates later maintenance and replacement of filter element 22 without interfering with the ongoing spraying operations below. This vertical airflow management method not only improves air purification but also effectively improves the working environment within the spray booth 100, enhancing the stability and ease of operation of the equipment.

[0080] The automotive parts spray booth also includes a negative pressure pump 3 and a pipe 4. The inlet end of the negative pressure pump 3 is located in the lower working chamber C, and the two ends of the pipe 4 are connected to the outlet end of the negative pressure pump 3 and the upper filter chamber B, respectively.

[0081] After the negative pressure pump 3 is started, it can extract the air containing paint mist or dust from the lower working chamber C, forming a local negative pressure environment, which helps to prevent pollutants from spreading outward and improve the cleanliness of the working environment.

[0082] The two ends of the pipe 4 are connected to the outlet of the negative pressure pump 3 and the upper filter chamber B of the spray booth 100, respectively, so that the extracted air is transported to the upper filter chamber B through the pipe 4 and purified by multiple filter modules 2 installed on the frame 1. The air passes through the filter element 22 from top to bottom, and the particulate matter in it is effectively intercepted. The purified air is returned to the spray booth 100, thereby realizing the recycling of air and maintaining a stable and clean airflow inside the spray booth 100.

[0083] It is evident that the air circulation system within the spray booth 100 is internal, preventing the emission of polluting gases to the outside, thus contributing to environmental protection.

[0084] It can be understood that, except for conflicting parts, the above embodiments 1-8 can be freely combined to form other embodiments of this utility model.

[0085] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0086] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0087] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0089] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A modular filtration device for a spray booth, characterized in that: Includes a frame (1) and a filter module (2), wherein the frame (1) can be fixed inside the spray booth (100), and a plurality of slots (A) are formed on the frame (1); The filter module (2) corresponds one-to-one with the grid (A) and includes a base frame (21), filter element (22), clamping frame (23) and locking component (24); The base frame (21) is detachably and fixedly connected to the grid (A) position of the frame (1); the clamping frame (23) can switch between a clamping state that clamps the base frame (21) and a disengaged state that moves away from the base frame (21), and is connected to the base frame (21); the locking member (24) can lock the clamping frame (23) and the base frame (21) in the clamping state; In the compressed state, the filter element (22) can be pressed between the compression frame (23) and the base frame (21), and the compression frame (23), the filter element (22) and the base frame (21) constitute a filtration channel.

2. The modular filtration device for spray booths as described in claim 1, characterized in that: The filter module (2) further includes a mesh (25) connected to the base frame (21) to form a first support for the filter element (22), and the filter element (22) can be pressed between the mesh (25) and the pressing frame (23).

3. The modular filtration device for spray booths as described in claim 1, characterized in that: The filter module (2) also includes a connecting positioning component (26) fixedly connected to the base frame (21), and the connecting positioning component (26) can be detachably fixed to the frame (1).

4. The modular filtration device for spray booths as described in claim 1, characterized in that: It also includes a first seal disposed between the filter module (2) and the frame (1); The lower surface of the base frame (21) and the upper surface of the frame (1) are mutually cooperating sealing surfaces, and the first seal can be pressed between the two sealing surfaces.

5. The modular filtration device for spray booths as described in claim 1, characterized in that: The filter module (2) further includes a second sealing element disposed on the outer edge of the filter element (22), and a sealing groove adapted to the second sealing element is provided on the base frame (21).

6. The modular filtration device for spray booths as described in claim 1, characterized in that: The locking component (24) is a rotary eccentric lock, and each eccentric lock includes a handle (241); When multiple eccentric locks are set, the handles (241) of the multiple eccentric locks whose positions are parallel to the swing axis of the clamping frame (23) are linked by the connecting rod (D).

7. The modular filtration device for spray booths as described in claim 1, characterized in that: The locking component (24) includes a magnet and a positioning pin that are respectively fixedly connected to the clamping frame (23) and the base frame (21). In the clamping state, the magnet and the positioning pin are magnetically attracted to each other so that the two lock the clamping frame (23) and the base frame (21).

8. The modular filtration device for a spray booth as described in any one of claims 1-7, characterized in that: Both the filter module (2) and the grid (A) are rectangular.

9. A spray booth for automotive parts, comprising a modular filter device for a spray booth as described in any one of claims 1-8, characterized in that: The frame (1) divides the interior space of the spray booth (100) into an upper filter chamber (B) and a lower working chamber (C). Air can flow from the upper filter chamber (B) through the filter module (2) to the lower working chamber (C). The upper filter chamber (B) is the top layer of the spray booth (100).

10. The automotive parts spray booth as described in claim 9, characterized in that: It also includes a negative pressure pump (3) and a pipe (4). The inlet end of the negative pressure pump (3) is located in the lower working chamber (C), and the two ends of the pipe (4) are respectively connected to the outlet end of the negative pressure pump (3) and the upper filter chamber (B).

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