Movable chain wheel ventilation cabinet
By introducing a sprocket system to optimize the mechanical relationship of the counterweight components, the problem of high resistance when the fume hood viewing window is opened or closed is solved, achieving lightweighting and cost savings, and reducing energy consumption and wear.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-20
AI Technical Summary
The existing fume hood viewing windows are quite heavy due to the matching counterweight components, resulting in significant resistance when opening or closing them, making them inconvenient to operate.
By adopting a sprocket system and optimizing the mechanical relationship of the counterweight components, the weight requirement of the counterweight block is reduced. The combined structure of the sprocket and chain reduces the movement resistance of the window.
It significantly reduces mechanical resistance, reduces the mass of counterweights, lowers energy consumption and wear, improves ease of operation, and reduces transportation and maintenance costs.
Smart Images
Figure CN224010770U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a fume hood, especially a dynamic chain wheel fume hood. BACKGROUND
[0002] The fume hood, also known as a fume hood, a smoke exhaust cabinet or an exhaust cabinet, is an important equipment for exhaust ventilation in a laboratory, especially widely used in a chemical laboratory. Its main function is to protect the experimental personnel from the harm of toxic gas, smoke, steam and dust, and at the same time prevent the harmful substances from spreading to the laboratory environment.
[0003] The visible window of the commonly used fume hood is usually made of glass. Since there is a certain requirement for the sealing effect, the visible window is usually opened and closed by the visible window cooperating with the counterweight. The counterweight assembly needs to be matched with the visible window during installation. The weight is large, the resistance is large when opening or closing, and it is not convenient to open or close. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a dynamic chain wheel fume hood, which is used to solve the problem that the visible window of the existing fume hood is usually opened and closed by the visible window cooperating with the counterweight, the counterweight assembly needs to be matched with the visible window during installation, the weight is large, the resistance is large when opening or closing, and it is not convenient to open or close.
[0005] In order to solve the above problems, the utility model provides a dynamic chain wheel fume hood, which comprises a cabinet body, four corners of the cabinet body are respectively provided with front upright columns and rear upright columns, the front upright columns are provided with a visible window opening, the rear upright columns are fixedly connected with a back plate, the visible window opening is provided with a visible window which is slidably opened or closed, the rear upright columns are fixedly connected with a slide, the slide is slidably connected with a counterweight assembly, both ends of the visible window are fixedly connected with a main chain, the other end of the main chain is fixedly connected with a hanging piece, the hanging piece is rotatably connected with a dynamic chain wheel, the dynamic chain wheel is cooperatively wound with a secondary chain, one end of the secondary chain is fixedly connected with the counterweight assembly, the other end of the secondary chain is fixedly connected with the rear upright column, and the top of the front upright column and the rear upright column is rotatably connected with a steering sprocket for steering the main chain.
[0006] The dynamic chain wheel fume hood provided by the utility model also has the following technical features:
[0007] Further, the counterweight assembly comprises a counterweight box, the counterweight box is placed with a counterweight block, the rear upright column is fixedly connected with a limiting plate, and the counterweight box is placed on the limiting plate.
[0008] Further, the weight of the counterweight assembly is matched with the weight of the visible window, and the visible window is balanced with the counterweight assembly under the condition of no external force.
[0009] Further, a double sliding groove is arranged on the window opening, the window slides in the inner sliding groove of the double sliding groove, and the outer side of the window is provided with a lower window which slides.
[0010] Further, the upper part of the steering sprocket is provided with a first layer steering sprocket for steering the second chain.
[0011] Further, the first layer steering sprocket on the front stand and the rear stand is respectively connected with a rotating electric drive device.
[0012] Further, the back plate is provided with an inspection hole.
[0013] The utility model has the following beneficial effects: by introducing the movable sprocket, the mechanical relationship of the counterweight system is re-optimized, the weight requirement of the counterweight block is greatly reduced, thereby the following beneficial effects are brought:
[0014] 1. Significantly reduce mechanical resistance, operation is more convenient: the mechanical advantage of the movable sprocket reduces the secondary chain tension by 50% (tension formula: F=W / 2. W=window weight), and the single movable sprocket can reduce the counterweight requirement to W / 2, thereby greatly reducing the mass of the counterweight block; the moving resistance of the window is reduced, and the experimenter can easily open and close, especially suitable for frequent adjustment of experimental scenes.
[0015] 2. Lightweight structure and cost saving: the traditional counterweight needs to balance with the weight of the window (1:1), and the introduction of the movable sprocket reduces the mass of the counterweight to less than 50%, reducing the amount of steel and transportation cost.
[0016] 3. Energy consumption and wear are reduced: the stress of the chain and sprocket assembly is reduced, the energy required to drive the movable window is reduced (the energy consumption of the rotating electric drive device is reduced); the wear rate of the chain, sprocket bearing is reduced due to the reduction of stress, the maintenance cycle is prolonged, and the long-term use cost is reduced; after the weight of the counterweight is reduced, the inertia of the system is reduced, the start and stop of the window are more gentle, and the structure loosening or deviation caused by inertia impact is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a rear view axonometric diagram of the movable sprocket fume hood of the utility model embodiment;
[0018] Figure 2 It is a front view axonometric diagram of the movable sprocket fume hood of the utility model embodiment before the window is closed;
[0019] Figure 3 It is a front view axonometric diagram of the movable sprocket fume hood of the utility model embodiment before the window is opened;
[0020] Figure 4The utility model discloses a partial axonometric diagram of the window switch mechanism of the movable chain wheel fume hood.
[0021] Figure 5 The utility model discloses an axonometric diagram of the window switch mechanism of the movable chain wheel fume hood.
[0022] (1-cabinet body, 2-front stand, 3-rear stand, 4-window opening, 5-back plate, 6-window, 7-lower window, 8-slide, 9-counterweight assembly, 10-main chain, 11-second chain, 12-hanging piece, 13-movable chain wheel, 14-vice chain, 15-reversing sprocket, 16-limiting plate, 17-double sliding slot, 18-first layer reversing sprocket, 19-inspection hole, 91-counterweight box, 92-counterweight) DETAILED DESCRIPTION
[0023] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.
[0024] As Figures 1 to 5 indicated in the embodiment of the movable chain wheel fume hood of the utility model, the movable chain wheel fume hood comprises a cabinet body 1, front stands 2 and rear stands 3 are respectively arranged on the four corners of the cabinet body 1, window openings 4 are arranged between the front stands 2, a back plate 5 is fixedly connected between the rear stands 3, windows 6 that can be slid to open or close are arranged on the window openings 4, slide ways 8 are fixedly connected to the rear stands 3, counterweight assemblies 9 are slidably connected in the slide ways 8, main chains 10 are fixedly connected to the two ends of the windows 6, the other end of the main chains 10 is fixedly connected to hanging pieces 12, movable chain wheels 13 are rotatably connected to the hanging pieces 12, vice chains 14 are wound on the movable chain wheels 13, one end of the vice chains 14 is fixedly connected to the counterweight assemblies 9, the other end of the vice chains 14 is fixedly connected to the rear stands 3, reversing sprockets 15 for reversing the main chains 10 are rotatably connected to the top of the front stands 2 and the rear stands 3.
[0025] Specifically, when the window openings 4 need to be opened, the windows 6 are lifted, the hanging pieces 12 move downward with the main chains 10 when the windows 6 move upward, at this time, the vice chains 14 pull the movable chain wheels 13 downward with the counterweight assemblies 9, when the windows 6 need to be closed, the windows 6 are pulled to move downward, the hanging pieces 12 are lifted by the main chains 10, at this time, the vice chains 14 lift the counterweight assemblies 9, the movable chain wheels 13 move in the same direction with the counterweight assemblies 9 and the windows 6 through the vice chains 14, so that the pulling force on the vice chains 14 is only half of the weight of the windows 6, thereby reducing the weight of the counterweight assemblies 9, facilitating installation and saving cost, and the resistance when the windows 6 are opened can be reduced, facilitating frequent opening and closing.
[0026] In an embodiment of the present application, preferably, the counterweight assembly 9 comprises a counterweight box 91, the counterweight block 92 is placed in the counterweight box 91, the limiting plate 16 is fixedly connected to the rear upright column 3, the counterweight box 9 is placed on the limiting plate 16, the weight of the counterweight block 92 of the counterweight assembly 9 is adjusted, and the limiting plate 16 is used to support the counterweight assembly 9 when the window 6 is opened, so as to prevent the chain from being stressed and fatigued.
[0027] In an embodiment of the present application, preferably, the weight of the counterweight assembly 9 is matched with the weight of the window 6, the window 6 is balanced with the counterweight assembly 9 in the state without external force, so as to avoid automatic sliding and rising when the window 6 is opened and closed.
[0028] In an embodiment of the present application, preferably, the double sliding grooves 17 are arranged on the window opening 4, the window 6 slides in the inner sliding groove of the double sliding grooves 17, the outer side of the window 6 is provided with the sliding lower window 7, the second chain 11 is fixedly connected to the lower window 7, the other end of the second chain 11 is fixedly connected with the counterweight assembly 9, so as to reduce the space occupied by the window when the window opening 4 is large, when the lower window 7 rises or falls, the counterweight assembly 9 is pulled up or down through the second chain 11, the counterweight assembly 9 loosens or pulls the secondary chain 14, so that the driving sprocket 13 rises or falls and is transmitted to the main chain 10, thereby driving the window 6 to rise or fall.
[0029] In an embodiment of the present application, preferably, the upper part of the turning sprocket 15 is provided with the first layer turning sprocket 18 for turning of the second chain 11, so as to adjust the turning of the second chain 11.
[0030] In an embodiment of the present application, preferably, the first layer turning sprocket 18 on the front upright column 2 and the rear upright column 3 is respectively connected with a rotating electric drive device (not shown in the figure, the structure of the prior art, which will not be described here), so as to rotate the first layer turning sprocket 18 in the electric drive mode, drive the second chain 11 to move to make the lower window 7 rise or fall, and the rising or falling of the lower window 7 is transmitted to the main chain 10 through the counterweight assembly 9 and the driving sprocket 13, thereby driving the window 6 to rise or fall.
[0031] In an embodiment of the present application, preferably, the back plate 5 is provided with the maintenance opening 19, so as to maintain and repair the counterweight assembly 9 and the driving sprocket 13.
[0032] In summary, the dynamic chain wheel ventilation cabinet in the above-mentioned embodiments of the utility model, specifically, when the window opening 4 needs to be opened, the lower window 7 is lifted, the counterweight assembly 9 moves downward along the slide 8 when the lower window 7 moves upward, at this time, the secondary chain 14 pulls the dynamic chain wheel 13 downward along with the counterweight assembly 9, drives the main chain 10 to pull the window 6 to move upward, when it needs to be closed, the lower window 7 is pulled to move downward, the lower window 7 drives the second chain 11 to lift the counterweight assembly 9, when the counterweight assembly 9 moves upward, the secondary chain 14 releases the dynamic chain wheel 13 to move upward, along with the upward movement of the dynamic chain wheel 13, the window 6 moves downward, if necessary, the electric drive device can be connected to drive the first layer steering sprocket 18 on the front upright column 2 and the rear upright column 3 to rotate, for driving the upward or downward movement of the lower window 7, the upward or downward movement of the lower window 7 drives the main chain 10 to move through the counterweight assembly 9 and the dynamic chain wheel 13, so that the window 6 rises or falls along with the lower window 7; by introducing the dynamic chain wheel 13 in the chain, the pulling force of the secondary chain 14 is reduced, so that the weight of the counterweight assembly 9 can be reduced, the installation is convenient and cost-saving, the resistance when the window 6 and the lower window 7 are opened synchronously can be reduced, and the frequent opening and closing is facilitated.
[0033] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.
Claims
1. A fume hood with a moving sprocket, characterized in that, The device includes a cabinet with front and rear uprights at its four corners. A viewing window is provided between the front uprights, and a back panel is fixedly connected between the rear uprights. The viewing window has a sliding opening and closing window. A slide rail is fixedly connected to the rear upright, and a counterweight assembly is slidably connected within the slide rail. A main chain is fixedly connected to both ends of the viewing window, and a hanging member is fixedly connected to the other end of the main chain. A drive sprocket is rotatably connected to the hanging member, and a secondary chain is wound around the drive sprocket. One end of the secondary chain is fixedly connected to the counterweight assembly, and the other end is fixedly connected to the rear upright. Steering sprockets for turning the main chain are rotatably connected to the tops of the front and rear uprights.
2. The fume hood with a moving sprocket according to claim 1, characterized in that: The counterweight assembly includes a counterweight box containing a counterweight block. A limit plate is fixedly connected to the rear column, and the counterweight box is placed on the limit plate.
3. The fume hood with a moving sprocket according to claim 2, characterized in that: The weight of the counterweight component is adapted to the weight of the window, and the window is balanced with the counterweight component in the absence of external force.
4. The fume hood with a moving sprocket according to claim 2, characterized in that: The viewing window opening is provided with double sliding grooves, and the viewing window slides in the inner sliding groove of the double sliding grooves. The outer side of the viewing window is provided with a sliding lower viewing window, and a second chain is fixedly connected to the lower viewing window. The other end of the second chain is fixedly connected to the counterweight assembly.
5. The fume hood with a moving sprocket according to claim 4, characterized in that: The upper part of the steering sprocket is provided with a first-level steering sprocket for steering the second chain.
6. The fume hood with a moving sprocket according to claim 5, characterized in that: The first-level steering sprockets on the front and rear columns are respectively connected to rotating electric drive devices.
7. The fume hood with a moving sprocket according to claim 1, characterized in that: The back panel has an inspection port.