Positive and negative pressure laminar flow clean cover capable of being cascaded

Abstract

The utility model discloses a cascading positive and negative pressure laminar flow clean cover which comprises a foldable cover body. The foldable cover body comprises a fixed frame, and a first folding structure and a second folding structure which are respectively arranged on two sides of the fixed frame; each of the first folding structure and the second folding structure comprises a top panel, a bottom panel, a first side panel, a second side panel and a third side panel; the top panel, the bottom panel, the first side panel and the second side panel are rotationally connected with the fixed frame through connecting hinges; the third side panel is rotationally connected with one end, far away from the fixed frame, of the top panel, the bottom panel, the first side panel or the second side panel through a connecting hinge; the edge of the bottom panel is provided with screw holes used for cascading the two or more foldable cover bodies through the connecting plates. Two or more than two positive and negative pressure laminar flow cleaning covers can be flexibly cascaded to form a larger laminar flow cleaning space, and the positive and negative pressure laminar flow cleaning cover is convenient to assemble and disassemble and has strong practicability.

Description

Technical Field

[0001] The present application relates to the technical field of laminar flow clean hoods, and in particular to a cascadable positive and negative pressure laminar flow clean hood. Background Art

[0002] Laminar clean hoods are divided into vertical laminar clean hoods and horizontal laminar clean hoods. The vertical laminar clean hood forms a clean air flow layer after the clean air passes through the flow net at a certain wind speed, so that the clean air flows vertically in one direction, thereby ensuring that the high cleanliness required by the process is achieved in the working area. The installation methods of vertical laminar clean hoods include hanging type (ceiling) and floor bracket type. The floor bracket type laminar clean hood mainly includes a bracket and a cover assembly. The bracket can support the cover assembly to a certain height to meet the operation needs. The cover assembly (wind chamber assembly) has a certain area, so that a certain range of clean space can be provided.

[0003] At present, the existing laminar flow clean hoods are generally of fixed size, which cannot be applied when the internal space requirements are high; they need to be assembled and disassembled on site, the assembly and disassembly process is relatively cumbersome, and they cannot be applied outdoors, and their practicality is poor. Therefore, the utility model proposes a cascadable positive and negative pressure laminar flow clean hood. Utility Model Content

[0004] The embodiment of the present application provides a cascadable positive and negative pressure laminar flow clean hood, which enables two or more positive and negative pressure laminar flow clean hoods to be flexibly cascaded to form a larger laminar flow clean space, and is easy to assemble and disassemble, and has strong practicality.

[0005] In view of this, the present application provides a cascadable positive and negative pressure laminar flow clean hood, comprising: a foldable hood body;

[0006] The foldable cover body comprises a fixed frame and a first folding structure and a second folding structure respectively arranged on two sides of the fixed frame;

[0007] The structures of the first folding structure and the second folding structure are completely the same, and both the first folding structure and the second folding structure include a top panel, a bottom panel, a first side panel, a second side panel and a third side panel;

[0008] The top panel, the bottom panel, the first side panel, the second side panel and the third side panel are all detachably connected with connecting hinges;

[0009] The top panel and the bottom panel are rotatably connected to the top edge and the bottom edge of the fixed frame respectively through the connecting hinges;

[0010] The first side panel and the second side panel are rotatably connected to the left edge and the right edge of the fixed frame respectively through the connecting hinge;

[0011] The third side panel is rotatably connected to the top panel, the bottom panel, the first side panel or the second side panel at one end away from the fixed frame through the connecting hinge;

[0012] A first screw hole is provided on one side of the bottom panel close to the third side panel for connecting the two foldable covers to each other in a longitudinal direction via a connecting plate;

[0013] The bottom panel is provided with second screw holes on both sides close to the first side panel and the second side panel for connecting the two foldable covers to each other in a width direction through a connecting plate;

[0014] The bottom panels of two adjacent foldable covers are detachably connected via the connecting plate.

[0015] Optionally, an air purification system is provided at the middle position of the top of the fixed frame;

[0016] A negative pressure fan assembly is respectively arranged on both sides of the top of the fixed frame;

[0017] A control system is disposed in the foldable cover, and the control system is electrically connected to the air purification system and the negative pressure fan assembly respectively;

[0018] When two or more foldable covers are cascaded to each other, the control systems on the two or more foldable covers are communicatively connected to each other.

[0019] Optionally, a wind cavity structure is provided in the top panel;

[0020] The wind cavity structure is provided with a flow-averaging screen for forming a uniform vertical laminar flow into the incoming airflow;

[0021] The air purification system comprises a filter air inlet assembly for inputting clean air into the air cavity structure. When the foldable cover is in an unfolded state, an air outlet of the filter air inlet assembly is in communication with the air cavity structure.

[0022] Optionally, the filtering air inlet assembly includes an air inlet fan and a filtering and disinfecting module for purifying the air.

[0023] Optionally, the filtering and disinfection module includes a primary filter, a plasma, an ozone reduction net and a high-efficiency filter which are sequentially arranged along the air inlet direction.

[0024] Optionally, the air purification system further comprises an air conditioning component for adjusting the temperature and humidity inside the foldable cover.

[0025] Optionally, the fixed frame is provided with a negative pressure air outlet channel for extracting the air inside the foldable cover;

[0026] The negative pressure fan assembly is located at the outlet of the negative pressure air outlet channel.

[0027] Optionally, the negative pressure fan assembly includes a centrifugal fan and a filter.

[0028] Optionally, casters are provided at the bottom of the fixed frame;

[0029] The bottom of the bottom panel is provided with adjustable supporting feet.

[0030] Optionally, an entry door is provided on the first side panel, the second side panel or the third side panel.

[0031] It can be seen from the above technical scheme that the embodiments of the present application have the following advantages: the cascadable positive and negative pressure laminar flow clean hood adopts a foldable structure, which is easy to assemble and disassemble, can be used in outdoor environments, and can flexibly cascade two or more positive and negative pressure laminar flow clean hoods to form a larger laminar flow clean space, which has strong practicality. Specifically, when folding, the third side panel can be rotated first to fold it onto the adjacent panel, and then the first side panel, the second side panel, the top panel and the bottom panel can be rotated in turn so that they are all folded onto the fixed frame, and the folding operation of the foldable cover body is completed; when unfolding, the bottom panel, the top panel, the second side panel, the first side panel and the third side panel can be unfolded in turn; at the same time, since the top panel, the bottom panel, the first side panel, the second side panel and the third side panel are all detachably connected to the connecting hinges, and the edge position of the bottom panel is provided with a first hinge for cascading adjacent foldable cover bodies along the length direction. Screw holes and second screw holes for cascading adjacent foldable covers along the width direction. When two or more foldable covers need to be cascaded, it is only necessary to align and bring the two or more foldable covers together in the direction of the desired cascading, and then remove the side panels that are connected to each other respectively (the corresponding side panels can be removed by removing the connecting hinges on the side panels), and finally connect and fix the adjacent bottom panels through the connecting plates, and paste sealing foam on the connecting surfaces to ensure that the cascading connecting surfaces are well sealed, thereby completing the flexible cascading between two or more foldable covers. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the unfolded state of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application;

[0033] Figure 2 A top view of the cascadable positive and negative pressure laminar flow clean hood in an expanded state in an embodiment of the present application;

[0034] Figure 3 It is a right view of the unfolded state of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application;

[0035] Figure 4 It is a rear view of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application in the unfolded state;

[0036] Figure 5 for Figure 3 Cross-section view along the AA direction;

[0037] Figure 6 for Figure 4 Cross-section along the BB direction;

[0038] Figure 7 The folding process of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application Figure 1 ;

[0039] Figure 8 The folding process of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application Figure 2 ;

[0040] Fig. 9 The folding process of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application Figure 3 ;

[0041] Fig.10 The folding process of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application Figure 4 ;

[0042] Fig.11 It is a schematic structural diagram of the folded state of the cascadable positive and negative pressure laminar flow clean hood in the embodiment of the present application;

[0043] Fig.12 This is a schematic diagram of the structure of the air purification system in the embodiment of the present application after the top cover plate of the housing is hidden;

[0044] Fig.13 This is a cross-sectional view of the air filter inlet assembly in the embodiment of the present application;

[0045] Fig.14 This is a schematic diagram of the structure of the filtering and disinfecting module in the embodiment of the present application;

[0046] Fig.15 This is a schematic diagram of the positive pressure wind direction inside the cascaded positive and negative pressure laminar flow clean hood in the embodiment of the present application;

[0047] Fig.16Schematic diagram of negative pressure wind direction inside a cascaded positive and negative pressure laminar flow clean hood in an embodiment of the present application;

[0048] Fig.17 This is a schematic diagram of a first cascading method of cascadable positive and negative pressure laminar flow clean hoods in an embodiment of the present application;

[0049] Fig.18 This is a schematic diagram of a second cascading method of cascadable positive and negative pressure laminar flow clean hoods in an embodiment of the present application;

[0050] Fig.19 It is a cross-sectional view of the cascaded positive and negative pressure laminar flow clean hoods in the embodiment of the present application;

[0051] Fig. 20 for Fig.19 A magnified view of the details of part A;

[0052] Wherein, the accompanying drawings are marked as follows:

[0053] 1-foldable cover, 11-fixed frame, 111-negative pressure air outlet channel, 12-top panel, 121-opening, 13-bottom panel, 14-first side panel, 15-second side panel, 16-third side panel, 2-air purification system, 21-filter air inlet assembly, 211-air inlet fan, 212-filter disinfection module, 2121-primary filter, 2122-plasma, 2123-ozone reduction net, 2124-high efficiency filter, 213-air outlet, 22-air conditioning assembly, 3-negative pressure fan assembly, 4-castors, 5-adjustable support feet, 6-entry and exit doors, 7-connecting hinges, 8-connecting plates. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] This application provides an embodiment of a cascadable positive and negative pressure laminar flow clean hood. For details, please refer to Figures 1 to 4 , Figures 7 to 11 as well as Figures 17 to 20 .

[0058] The cascaded positive and negative pressure laminar flow clean hood in this embodiment comprises: a foldable hood body 1, the foldable hood body 1 comprises a fixed frame 11 and a first folding structure and a second folding structure respectively arranged on both sides of the fixed frame 11, the structures of the first folding structure and the second folding structure are completely the same, and the first folding structure and the second folding structure both comprise a top panel 12, a bottom panel 13, a first side panel 14, a second side panel 15 and a third side panel 16; the top panel 12, the bottom panel 13, the first side panel 14, the second side panel 15 and the third side panel 16 are all detachably connected with a connecting hinge 7; the top panel 12 and the bottom panel 13 are rotatably connected to the top edge and the bottom edge of the fixed frame 11 respectively through the connecting hinge 7; the first side panel 14 The second side panel 15 is rotatably connected to the left edge and the right edge of the fixed frame 11 respectively through the connecting hinge 7; the third side panel 16 is rotatably connected to the top panel 12, the bottom panel 13, the first side panel 14 or the end of the second side panel 15 away from the fixed frame 11 through the connecting hinge 7; a first screw hole for cascading the two foldable covers 1 in the length direction through the connecting plate 8 is provided on the side of the bottom panel 13 close to the third side panel 16; second screw holes for cascading the two foldable covers 1 in the width direction through the connecting plate 8 are provided on both sides of the bottom panel 13 close to the first side panel 14 and the second side panel 15; the bottom panels 13 of two adjacent foldable covers 1 can be detachably connected through the connecting plate 8.

[0059] It should be noted that the cascadable positive and negative pressure laminar flow clean hood adopts a foldable structure, which is easy to assemble and disassemble, can be used in outdoor environments, and can flexibly cascade two or more positive and negative pressure laminar flow clean hoods to form a larger laminar flow clean space, which has strong practicality. Specifically, when folding, the third side panel 16 can be rotated first to fold it onto the adjacent panel, and then the first side panel 14, the second side panel 15, the top panel 12 and the bottom panel 13 can be rotated in turn to fold them all onto the fixed frame 11, thus completing the folding operation of the foldable cover body 1; when unfolding, the bottom panel 13, the top panel 12, the second side panel 15, the first side panel 14 and the third side panel 16 can be unfolded in turn; at the same time, since the top panel 12, the bottom panel 13, the first side panel 14, the second side panel 15 and the third side panel 16 are all detachably connected to the connecting hinge 7, and the edge position of the bottom panel 13 is provided with a device for folding adjacent foldable covers The first screw holes for cascading the body 1 along the length direction and the second screw holes for cascading adjacent foldable cover bodies 1 along the width direction. When two or more foldable cover bodies 1 need to be cascaded, it is only necessary to align and bring the two or more foldable cover bodies 1 together along the direction of the desired cascading, and then remove the side panels connected to each other respectively (the corresponding side panels can be removed by removing the connecting hinges 7 on the side panels), and finally connect and fix the adjacent bottom panels 13 through the connecting plate 8, and paste sealing foam on the connecting surface to ensure that the cascading connecting surface is well sealed, thereby completing the flexible cascading between the two or more foldable cover bodies 1.

[0060] The above is an embodiment of a cascaded positive and negative pressure laminar flow clean hood provided in the embodiment of the present application. The following is an embodiment of a cascaded positive and negative pressure laminar flow clean hood provided in the embodiment of the present application. For details, please refer to Figures 1 to 20 .

[0061] The cascaded positive and negative pressure laminar flow clean hood in this embodiment comprises: a foldable hood body 1, the foldable hood body 1 comprises a fixed frame 11 and a first folding structure and a second folding structure respectively arranged on both sides of the fixed frame 11, the structures of the first folding structure and the second folding structure are completely the same, and the first folding structure and the second folding structure both comprise a top panel 12, a bottom panel 13, a first side panel 14, a second side panel 15 and a third side panel 16; the top panel 12, the bottom panel 13, the first side panel 14, the second side panel 15 and the third side panel 16 are all detachably connected with a connecting hinge 7; the top panel 12 and the bottom panel 13 are rotatably connected to the top edge and the bottom edge of the fixed frame 11 respectively through the connecting hinge 7; the first side panel 14 The second side panel 15 is rotatably connected to the left edge and the right edge of the fixed frame 11 respectively through the connecting hinge 7; the third side panel 16 is rotatably connected to the top panel 12, the bottom panel 13, the first side panel 14 or the end of the second side panel 15 away from the fixed frame 11 through the connecting hinge 7; a first screw hole for cascading the two foldable covers 1 in the length direction through the connecting plate 8 is provided on the side of the bottom panel 13 close to the third side panel 16; second screw holes for cascading the two foldable covers 1 in the width direction through the connecting plate 8 are provided on both sides of the bottom panel 13 close to the first side panel 14 and the second side panel 15; the bottom panels 13 of two adjacent foldable covers 1 can be detachably connected through the connecting plate 8.

[0062] It should be noted that the cascadable positive and negative pressure laminar flow clean hood can flexibly cascade two or more positive and negative pressure laminar flow clean hoods as needed to increase the internal space of the laminar flow clean hood and realize the medical building equipment.

[0063] An air purification system 2 is arranged in the middle position of the top of the fixed frame 11; a negative pressure fan assembly 3 is respectively arranged on both sides of the top of the fixed frame 11; a control system is arranged in the foldable cover body 1, and the control system is electrically connected to the air purification system 2 and the negative pressure fan assembly 3 respectively; when two or more foldable cover bodies 1 are cascaded with each other, the control systems on the two or more foldable cover bodies 1 can be communicated and connected to realize a parallel control mode of wireless interconnection between multiple machines.

[0064] It should be noted that the existing laminar flow clean hood does not have an air purification system 2 and requires an external disinfection machine for use. However, the present application connects the air purification system 2 with the foldable hood body 1 as a whole, which can make the laminar flow clean hood structure more compact and improve the utilization rate of space. Moreover, through the cooperation of the air purification system 2 and the negative pressure fan assembly 3, the internal space of the foldable hood body 1 can form positive pressure or negative pressure, thereby effectively improving the practicality of the laminar flow clean hood.

[0065] A wind cavity structure is arranged in the top panel 12, and a flow equalizing mesh plate is arranged in the wind cavity structure for forming a uniform vertical laminar flow of the incoming airflow. The air purification system 2 includes a filter air inlet assembly 21 for inputting clean air into the wind cavity structure. When the foldable cover body 1 is in the unfolded state, the air outlet 213 of the filter air inlet assembly 21 is connected to the wind cavity structure.

[0066] It should be noted that the air outlet 213 of the filtering air inlet assembly 21 is arranged on the side where the filtering air inlet assembly 21 is in contact with the top panel 12, and a corresponding opening 121 is provided on the side of the top panel 12 close to the filtering air inlet assembly 21 for sealingly connecting with the air outlet 213 of the filtering air inlet assembly 21 when the foldable cover body 1 is fully unfolded. The opening 121 is communicated with the wind cavity structure inside the top panel 12, so that when the foldable cover body 1 is fully unfolded, the air outlet 213 of the filtering air inlet assembly 21 can be communicated with the wind cavity structure inside the top panel 12 through the opening 121.

[0067] The filter air inlet assembly 21 includes an air inlet fan 211 and a filter sterilization module 212 for purifying air. Specifically, the filter sterilization module 212 is arranged at the air inlet of the filter air inlet assembly 21, and the air inlet fan 211 is arranged at the air outlet 213 of the filter air inlet assembly 21.

[0068] Specifically, the filtering and disinfection module 212 can be installed at the air inlet of the filtering air inlet assembly 21 through a pull-out structure. The filtering and disinfection module 212 includes a primary filter 2121, a plasma 2122, an ozone reduction net 2123 and a high-efficiency filter 2124 arranged in sequence along the air inlet direction.

[0069] The air purification system 2 also includes an air conditioning component 22 for adjusting the temperature and humidity inside the foldable cover body 1, so as to solve the problem of the internal space being relatively stuffy, thereby improving the use comfort of the laminar clean cover.

[0070] It can be understood that the installation, operation and control of the air-conditioning component 22 are independent, and do not cooperate with the air inlet fan 211 and the filtering and disinfection module 212, but the cold and hot air inside are clean air that has been filtered and disinfected, that is, the operation of the air-conditioning component 22 will not change the cleanliness inside the laminar clean hood, but only adjust the temperature and humidity inside the clean hood.

[0071] The fixed frame 11 is provided with a negative pressure air outlet channel 111 for extracting the air inside the foldable cover body 1 , and the negative pressure fan assembly 3 is located at the outlet of the negative pressure air outlet channel 111 .

[0072] Specifically, the inlet of the negative pressure air outlet channel 111 is located at the bottom of the inner side of the fixed frame 11, and the negative pressure fan assembly 3 includes a centrifugal fan and a filter.

[0073] Casters 4 are provided at the bottom of the fixed frame 11 for easy movement; adjustable supporting feet 5 are provided at the bottom of the bottom panel 13. By adjusting the height of the adjustable supporting feet 5, the unfolded laminar clean hood can be kept horizontal, so that the laminar clean hood can be used in a variety of terrain environments and is more practical.

[0074] The first side panel 14 , the second side panel 15 or the third side panel 16 may be provided with an access door 6 .

[0075] After the device is fully unfolded, the air purification system 2 can generate clean air and input it into the wind cavity structure in the top panel 12. The clean air forms laminar clean air through the flow-averaging mesh plate in the wind cavity structure, which can make the air quality inside the laminar clean hood reach Class 100 cleanliness and form a positive pressure inside the laminar clean hood. Starting the negative pressure fan assembly 3 can form a negative pressure inside the laminar clean hood.

[0076] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cascadable positive and negative pressure laminar flow clean hood, characterized in that: include: Foldable cover; The foldable cover body comprises a fixed frame and a first folding structure and a second folding structure respectively arranged on two sides of the fixed frame; The structures of the first folding structure and the second folding structure are completely the same, and both the first folding structure and the second folding structure include a top panel, a bottom panel, a first side panel, a second side panel and a third side panel; The top panel, the bottom panel, the first side panel, the second side panel and the third side panel are all detachably connected with connecting hinges; The top panel and the bottom panel are rotatably connected to the top edge and the bottom edge of the fixed frame respectively through the connecting hinges; The first side panel and the second side panel are rotatably connected to the left edge and the right edge of the fixed frame respectively through the connecting hinge; The third side panel is rotatably connected to the top panel, the bottom panel, the first side panel or the second side panel at one end away from the fixed frame through the connecting hinge; A first screw hole is provided on one side of the bottom panel close to the third side panel for connecting the two foldable covers to each other in a longitudinal direction via a connecting plate; The bottom panel is provided with second screw holes on both sides close to the first side panel and the second side panel for connecting the two foldable covers to each other in a width direction through a connecting plate; The bottom panels of two adjacent foldable covers are detachably connected via the connecting plate.

2. The cascadable positive and negative pressure laminar flow clean hood according to claim 1, characterized in that: An air purification system is provided in the middle of the top of the fixed frame; A negative pressure fan assembly is respectively arranged on both sides of the top of the fixed frame; A control system is disposed in the foldable cover, and the control system is electrically connected to the air purification system and the negative pressure fan assembly respectively; When two or more foldable covers are cascaded to each other, the control systems on the two or more foldable covers are communicatively connected to each other.

3. The cascadable positive and negative pressure laminar flow clean hood according to claim 2, characterized in that: A wind cavity structure is provided in the top panel; The wind cavity structure is provided with a flow-averaging screen for forming a uniform vertical laminar flow into the incoming airflow; The air purification system comprises a filter air inlet assembly for inputting clean air into the air cavity structure. When the foldable cover is in an unfolded state, an air outlet of the filter air inlet assembly is in communication with the air cavity structure.

4. The cascadable positive and negative pressure laminar flow clean hood according to claim 3, characterized in that: The filtering air intake component includes an air intake fan and a filtering and disinfecting module for purifying the air.

5. The cascadable positive and negative pressure laminar flow clean hood according to claim 4, characterized in that: The filtering and sterilizing module comprises a primary filter, a plasma, an ozone reduction net and a high efficiency filter which are sequentially arranged along the air inlet direction.

6. The cascadable positive and negative pressure laminar flow clean hood according to claim 3, characterized in that: The air purification system also includes an air conditioning component for adjusting the temperature and humidity inside the foldable cover.

7. The cascadable positive and negative pressure laminar flow clean hood according to claim 2, characterized in that: The fixed frame is provided with a negative pressure air outlet channel for extracting the air inside the foldable cover; The negative pressure fan assembly is located at the outlet of the negative pressure air outlet channel.

8. The cascadable positive and negative pressure laminar flow clean hood according to claim 2, characterized in that: The negative pressure fan assembly includes a centrifugal fan and a filter.

9. The cascadable positive and negative pressure laminar flow clean hood according to claim 1, characterized in that: Casters are arranged at the bottom of the fixed frame; The bottom of the bottom panel is provided with adjustable supporting feet.

10. The cascadable positive and negative pressure laminar flow clean hood according to claim 1, characterized in that: The first side panel, the second side panel or the third side panel is provided with an entry door.

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