A negative pressure laminar flow hood

Abstract

The utility model discloses a negative pressure type 100-level laminar flow hood, comprising a hood body, a negative pressure chamber fixedly installed inside the hood body, an air inlet opened at the front end of the negative pressure chamber, an air outlet opened at the rear end of the negative pressure chamber, an exhaust fan fixedly installed inside the air outlet for extracting air inside the negative pressure chamber, a fixed frame fixedly installed at the front end of the air outlet, a straight slide groove opened inside the fixed frame, a support spring fixedly installed on the inner wall of the straight slide groove, a push plate fixedly installed outside the support spring, a 100-level filter element movably connected to the push plate at one end away from the support spring, the straight slide groove passes through the negative pressure chamber and the outer side of the front end of the hood body at one end away from the support spring, and a replacement port is fixedly installed at the opening of one end of the straight slide groove away from the support spring. The utility model realizes negative pressure type 100-level filtration and facilitates the cleaning and replacement of the 100-level filter element.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification and clean room equipment, in particular to a negative pressure type 100-level laminar flow hood. Background Art

[0002] Laminar flow hood is a device used to provide a sterile or clean environment. It mainly uses a high-efficiency air filtration system to send indoor air to the operating area in a uniform horizontal airflow, thereby ensuring that the air in the working area remains clean. This horizontal laminar airflow will remove suspended particles and microorganisms to the outside, preventing them from entering the working area, thereby protecting the purity of experimental objects or surgical areas. It is widely used in biological laboratories, hospital operating rooms, industrial manufacturing and other fields, providing these fields with a controlled working environment to ensure the safety and purity of experimental objects or surgical areas in the operating area.

[0003] Existing laminar flow hoods usually adopt a positive pressure design, which uses a fan to send air into the hood for filtration, forming a one-way clean air layer to protect the working area from external pollution. However, while the positive pressure laminar flow hood prevents external pollution from entering, it may also cause the accumulation of pollutants in local areas of the hood due to poor airflow organization, thus affecting the air purification effect. Utility Model Content

[0004] The purpose of the utility model is to provide a negative pressure laminar flow hood to solve the problem that the existing laminar flow hoods mentioned in the above background technology usually adopt a positive pressure design, and send air into the hood for filtration through a fan to form a clean air layer with unidirectional flow to protect the working area from external pollution. However, while the positive pressure laminar flow hood prevents external pollution from entering, it may also cause the accumulation of pollutants in the local area of ​​the hood due to poor airflow organization, thereby affecting the air purification effect.

[0005] The hood is provided with a negative pressure chamber, the front end of which is provided with an air inlet, the rear end of which is provided with an air outlet, the inner side of which is provided with an exhaust fan for extracting air from the negative pressure chamber. The front end of the air outlet is provided with a fixed frame, the inner side of which is provided with a straight slide groove, the inner side wall of the straight slide groove is fixedly provided with a supporting spring, the outer side of the supporting spring is fixedly provided with a push plate, the push plate is movably connected with a 100-grade filter element at one end away from the supporting spring, the straight slide groove penetrates outwardly through the negative pressure chamber and the outer side of the front end of the hood body at one end away from the supporting spring, the straight slide groove is fixedly provided with a replacement port at an opening at one end away from the supporting spring, the front end of the replacement port penetrates and is movably connected with an L-shaped plug plate, and the front end of the hood body is hinged with a filter grille for blocking and filtering larger impurities in the air.

[0006] Preferably, a mounting top seat is fixedly installed on the upper end of the cover body, and fixing holes are opened through the four corners of the mounting top seat.

[0007] Preferably, there are two air outlets, which are symmetrically distributed on both sides of the rear end of the negative pressure chamber. The lower end of the negative pressure chamber passes through the bottom of the cover body and is fixedly provided with a barometer for detecting the air pressure inside the negative pressure chamber.

[0008] Preferably, the support spring is in a compressed state, there are several support springs, which are symmetrically distributed from top to bottom along the inner wall of the straight slide groove, and the outer end of the push plate is movably connected to the inner wall of the straight slide groove.

[0009] Preferably, the upper and lower ends of the 100-level filter element are movably connected to the inner wall of the straight slide groove, and the inner side of the L-shaped plug plate and the outer side of the 100-level filter element are connected to each other.

[0010] Preferably, a first bulge is provided at the lower end of the filter grille, and a second bulge is provided at the front side of the lower end of the cover body.

[0011] Preferably, a fastening screw is passed through the middle of the first protrusion and the second protrusion and is movably connected thereto, and a fastening nut for locking and fixing the fastening screw is threadedly connected to the outer curved surface at the rear end of the fastening screw.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] When the exhaust fan of the utility model is turned on, the air inside the negative pressure chamber will be extracted, so that negative pressure will be generated inside the negative pressure chamber. When negative pressure is generated inside the negative pressure chamber, the external air will be sucked into the negative pressure chamber through the air inlet. When the external air is sucked into the negative pressure chamber through the air inlet, the larger impurities in the external air will be blocked and filtered through the filter grille, so as to prevent the larger impurities in the external air from entering the front end of the 100-level filter element and blocking the 100-level filter element. After the filter grille blocks and filters the larger impurities in the external air, the 100-level filter element will perform secondary purification and filtration on the external air after the blocking and filtration. At the same time, the air after the secondary filtration will enter the negative pressure chamber and be discharged to the outside through the exhaust fan, thereby realizing the effect of negative pressure type 100-level filtration.

[0014] The utility model also pushes the L-shaped plug plate forward to move out of the front end of the replacement port. When the L-shaped plug plate moves out of the front end of the replacement port, the inner side of the L-shaped plug plate will no longer seal and block the outer side of the 100-level filter element. When the inner side of the L-shaped plug plate will no longer seal and block the outer side of the 100-level filter element, the elastic potential energy generated by the compression deformation of the supporting spring will push the push plate to move outward along the inner side wall of the straight slide groove. When the push plate moves outward along the inner side wall of the straight slide groove, it will push the 100-level filter element to move outward along the inner side wall of the straight slide groove. When the 100-level filter element moves outward, the 100-level filter element that moves outward can be taken out through the replacement port for cleaning and replacement, thereby realizing negative pressure 100-level filtration and facilitating the cleaning and replacement of the 100-level filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a negative pressure 100-level laminar flow hood of the utility model. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the overall structure of a negative pressure 100-level laminar flow hood of the utility model. Figure 2 ;

[0017] Figure 3 This is a schematic diagram of the overall structure of a negative pressure 100-level laminar flow hood of the utility model. Figure 1 ;

[0018] Figure 4 This is a schematic diagram of the overall structure of a negative pressure 100-level laminar flow hood of the utility model. Figure 2 .

[0019] In the figure: 1. cover body; 2. air inlet; 3. air outlet; 4. exhaust fan; 5. barometer; 6. fixing frame; 7. straight slide groove; 8. support spring; 9. replacement port; 10. Class 100 filter element; 11. filter grille; 12. first protrusion; 13. second protrusion; 14. fastening screw; 15. fastening nut; 16. negative pressure chamber; 17. mounting top seat; 18. push plate; 19. L-shaped plug plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4The utility model provides a negative pressure laminar flow hood technical solution: comprising a hood body 1, a mounting top seat 17 is fixedly installed on the upper end of the hood body 1, and fixing holes are opened at the four corners of the mounting top seat 17, so that the mounting top seat 17 can be installed and fixed by the fixing holes and mounting bolts;

[0022] A negative pressure chamber 16 is fixedly installed inside the cover body 1, an air inlet 2 is opened at the front end of the negative pressure chamber 16, an air outlet 3 is opened at the rear end of the negative pressure chamber 16, and there are two air outlets 3, which are symmetrically distributed on both sides of the rear end of the negative pressure chamber 16, an exhaust fan 4 for extracting air from the negative pressure chamber 16 is fixedly installed on the inside of the air outlet 3, and a barometer 5 for detecting the internal air pressure of the negative pressure chamber 16 is fixedly installed at the bottom of the cover body 1 through the lower end of the negative pressure chamber 16, a fixing frame 6 is fixedly installed at the front end of the air outlet 3, a straight slide groove 7 is opened on the inside of the fixing frame 6, a support spring 8 is fixedly installed on the inner wall of the straight slide groove 7, and the support spring 8 is in a compressed state, and there are several support springs 8, which are arranged in the order of the inner wall of the straight slide groove 7 from top to bottom. Symmetrically distributed, a push plate 18 is fixedly installed on the outside of the support spring 8, and the outer end of the push plate 18 is movably connected to the inner wall of the straight slide groove 7, and the push plate 18 is movably connected to the one side of the support spring 8, and the upper and lower ends of the one-hundred-level filter element 10 are movably connected to the inner wall of the straight slide groove 7, and the one side of the straight slide groove 7 away from the support spring 8 passes through the negative pressure chamber 16 and the outer side of the front end of the cover body 1, and the straight slide groove 7 is away from The spring 8 is fixedly installed at the opening of the one side of the support spring 8, and the front end of the replacement port 9 is penetrated and movably connected with an L-shaped plug plate 19, and the inner side of the L-shaped plug plate 19 and the outer side of the hundred-level filter element 10 are connected to each other, so that the hundred-level filter element 10 is sealed and blocked by the L-shaped plug plate 19;

[0023] A filter grille 11 for blocking and filtering larger impurities in the air is hinged at the front opening of the cover body 1, a first protrusion 12 is provided at the lower end of the filter grille 11, and a second protrusion 13 is provided on the front side of the lower end of the cover body 1. A fastening screw 14 is movably connected through the middle of the first protrusion 12 and the second protrusion 13, and a fastening nut 15 for locking and fixing the fastening screw 14 is threadedly connected to the outer curved surface of the rear end of the fastening screw 14, so that the filter grille 11 is fixed to the front end of the cover body 1 by the fastening nut 15 and the fastening screw 14.

[0024] Working principle: when in use, the utility model controls to turn on the exhaust fan 4. When the exhaust fan 4 is turned on, the air inside the negative pressure chamber 16 will be extracted, so that a negative pressure is generated inside the negative pressure chamber 16. When a negative pressure is generated inside the negative pressure chamber 16, the outside air will be sucked into the negative pressure chamber 16 through the air inlet 2. When the outside air is sucked into the negative pressure chamber 16 through the air inlet 2, the larger impurities in the outside air will be blocked and filtered through the filter grille 11 to prevent the larger impurities in the outside air from entering the front end of the 100-level filter element 10 and blocking the 100-level filter element 10. After the filter grille 11 blocks and filters the larger impurities in the outside air, the 100-level filter element 10 will perform secondary purification and filtration on the blocked and filtered outside air. At the same time, the air after the secondary filtration will enter the negative pressure chamber 16 and be discharged to the outside through the exhaust fan 4, thereby realizing the effect of negative pressure type 100-level filtration.

[0025] When it is necessary to clean and replace the 100-level filter element 10, the L-shaped plug plate 19 is pushed forward to move out of the front end of the replacement port 9. When the L-shaped plug plate 19 moves out of the front end of the replacement port 9, the inner side of the L-shaped plug plate 19 will no longer seal and block the outer side of the 100-level filter element 10. When the inner side of the L-shaped plug plate 19 will no longer seal and block the outer side of the 100-level filter element 10, the elastic potential energy generated by the compression deformation of the support spring 8 will push the push plate 18 to move outward along the inner side wall of the straight slide groove 7. When the push plate 18 moves outward along the inner side wall of the straight slide groove 7, it will push the 100-level filter element 10 to move outward along the inner side wall of the straight slide groove 7. When the 100-level filter element 10 moves outward, the 100-level filter element 10 that moves outward can be taken out through the replacement port 9 for cleaning and replacement, thereby realizing negative pressure 100-level filtration and facilitating the cleaning and replacement of the 100-level filter element 10;

[0026] At the same time, the fastening nut 15 is loosened by rotating. When the fastening nut 15 is loosened, the fastening screw 14 is pulled outward along the middle of the first protrusion 12 and the second protrusion 13. When the fastening screw 14 is pulled outward along the middle of the first protrusion 12 and the second protrusion 13, the filter grille 11 is pushed outward to open. When the filter grille 11 is opened, it is convenient to clean and maintain the filter grille 11.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A negative pressure 100-level laminar flow hood, characterized in that: The invention comprises a cover body (1), wherein a negative pressure chamber (16) is fixedly installed inside the cover body (1), an air inlet (2) is provided at the front end of the negative pressure chamber (16), an air outlet (3) is provided at the rear end of the negative pressure chamber (16), an exhaust fan (4) for extracting air from the negative pressure chamber (16) is fixedly installed inside the air outlet (3), a fixing frame (6) is fixedly installed at the front end of the air outlet (3), a straight slide groove (7) is provided inside the fixing frame (6), a support spring (8) is fixedly installed on the inner wall of the straight slide groove (7), and the outer side of the support spring (8) is fixedly installed A push plate (18) is provided, and the push plate (18) is movably connected to a hundred-level filter element (10) at one end away from the support spring (8). The straight slide groove (7) is traversed outwardly through the negative pressure chamber (16) and the front outer side of the cover body (1) at one end away from the support spring (8). A replacement port (9) is fixedly installed at the opening of the straight slide groove (7) at one end away from the support spring (8). The front end of the replacement port (9) is traversed and movably connected to an L-shaped plug plate (19). A filter grille (11) for blocking and filtering larger impurities in the air is hinged at the front opening of the cover body (1).

2. A negative pressure laminar flow hood according to claim 1, characterized in that: A mounting top seat (17) is fixedly mounted on the upper end of the cover body (1), and fixing holes are provided through the four corners of the mounting top seat (17).

3. A negative pressure laminar flow hood according to claim 2, characterized in that: There are two air outlets (3), which are symmetrically distributed on both sides of the rear end of the negative pressure chamber (16). The lower end of the negative pressure chamber (16) passes through the bottom of the cover body (1) and is fixedly provided with a barometer (5) for detecting the internal air pressure of the negative pressure chamber (16).

4. A negative pressure 100-level laminar flow hood according to claim 3, characterized in that: The support spring (8) is in a compressed state. There are a plurality of support springs (8) which are symmetrically distributed from top to bottom along the inner wall of the straight slide groove (7). The outer end of the push plate (18) is movably connected to the inner wall of the straight slide groove (7).

5. A negative pressure 100-level laminar flow hood according to claim 4, characterized in that: The upper and lower ends of the 100-level filter element (10) are movably connected to the inner wall of the straight slide groove (7), and the inner side of the L-shaped plug plate (19) and the outer side of the 100-level filter element (10) are connected to each other.

6. A negative pressure 100-level laminar flow hood according to claim 5, characterized in that: A first convex block (12) is provided at the lower end of the filter grille (11), and a second convex block (13) is provided at the front side of the lower end of the cover body (1).

7. A negative pressure 100-level laminar flow hood according to claim 6, characterized in that: A fastening screw (14) is inserted through the middle of the first protrusion (12) and the second protrusion (13) and is movably connected thereto. A fastening nut (15) for locking and fixing the fastening screw (14) is threadedly connected to the outer curved surface at the rear end of the fastening screw (14).

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