Intelligent ventilation cabinet

Abstract

The utility model relates to the technical field of experimental equipment, in particular to an intelligent ventilation cabinet which comprises a cabinet body. The negative pressure end comprises a negative pressure fan for generating negative pressure and an air inducing cover; the positive pressure end comprises a positive pressure fan for generating positive pressure and a filter screen detachably mounted at an air inlet of the positive pressure fan; the feedback end comprises a photosensitive diode for detecting that the filter screen is installed in place and a controller, and the photosensitive diode is electrically connected with the controller; the photosensitive diode is fixedly mounted on a machine body of the positive pressure fan; the negative pressure end faces the positive pressure end, and the negative pressure end and the positive pressure end are arranged on the two sides of the cabinet body. According to the utility model, the positive pressure fan blows air and directly blows the air to the negative pressure end, and according to the Bernoulli equation, the higher the flow rate is, the higher the air pressure is, so that the air pressure inside the cabinet body is far greater than the air pressure outside the cabinet body, the air outside the cabinet body enters the cabinet body, and a laboratory technician is prevented from breathing the air inside the cabinet body; convection air flow forms an air curtain, and the effect of protecting experimenters is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental equipment, in particular to an intelligent fume hood. Background Art

[0002] Fume hood is a kind of experimental equipment.

[0003] For example, Chinese patent application number 202310632507.8 discloses a laboratory fume hood, which belongs to the technical field of fume hoods, and includes a cabinet body, an operating area is provided in the cabinet body, a fume box is provided on the top of the cabinet body, a cavity is provided in the fume box, and air inlets are symmetrically opened on the bottom wall of the fume box, a mounting plate is horizontally provided in the fume box, an exhaust pipe is provided in the middle position of the top of the mounting box, an exhaust fan is provided in the exhaust pipe, filter boxes are symmetrically provided on both sides of the exhaust pipe in the cavity, and a cleaning component is also provided in the cavity. The present invention solves the problem of the large footprint of the fume hood in the prior art by arranging a cleaning component in the fume box. The cleaning component always moves in the fume box while ensuring the cleaning effect of the filter box, and does not move outside the fume box.

[0004] For another example, the Chinese patent with application number 202321611566.9 discloses a purification fume hood, including a fume box, a detachable filter assembly, a box body, a gas purification module and a ventilation net. The detachable filter assembly is snap-connected to the fume box, and the fume box is connected to the side wall of the box body by welding. The gas purification module is fixedly installed in the box body, and the gas purification module is passed through the side wall of the box body. A ventilation net is fixedly installed on the back of the box body. A slide groove is provided on the side wall of the fume box. The detachable filter assembly includes a filter cover, and a handle is fixedly provided on the side wall of the filter cover. The detachable filter assembly includes filter cotton and a fixed block, and the filter cotton is fixedly provided in the filter cover, and the fixed block is movably connected to the filter cover. The utility model can purify the gas through the use of the detachable filter assembly and the gas purification module, and can also conveniently filter the gas that needs to be purified, thereby preventing dust accumulation from clogging the air inlet hood.

[0005] Combining the two patents, the existing fume hoods on the market use passive exhaust with limited wind force. Experimenters are prone to absorb harmful gases when doing experiments. If the experimenters wear protective clothing, it is not convenient to operate, and secondly, all-round protection against low-risk gases will result in a waste of resources.

[0006] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Utility Model Content

[0007] The purpose of the utility model is to provide an intelligent fume hood which can effectively solve the above technical problems.

[0008] In order to achieve the purpose of this utility model, the following technical solutions are adopted:

[0009] An intelligent fume hood, comprising:

[0010] Cabinet; negative pressure end: a negative pressure fan and an exhaust hood that generate negative pressure; positive pressure end: a positive pressure fan that generates positive pressure and a filter that can be detachably installed at the air inlet of the positive pressure fan; feedback end: a photodiode and a controller that detects whether the filter is installed in place, and the photodiode is electrically connected to the controller; the photodiode is fixedly installed on the body of the positive pressure fan; the negative pressure end is opposite to the positive pressure end, and the negative pressure end and the positive pressure end are arranged on both sides of the cabinet.

[0011] Further: air ducting plates are installed on both sides of the cabinet.

[0012] Furthermore: the negative pressure fan is connected to the induced draft hood through a pipeline.

[0013] Furthermore: the upper end of the filter is fixedly connected to the lower pressing block, and the lower pressing block is detachably connected to the body of the positive pressure fan.

[0014] Further: a protective net is installed on the body of the positive pressure fan.

[0015] Further: the controller is electrically connected to a timer.

[0016] Compared with the prior art, the utility model has the following beneficial effects: in the intelligent fume hood of the utility model, the positive pressure fan blows air directly toward the negative pressure end. On the one hand, according to the Bernoulli equation, the greater the flow rate, the greater the wind pressure, so that the wind pressure inside the cabinet is much greater than the wind pressure outside the cabinet, so that the air outside the cabinet enters the cabinet, preventing the experimenter from breathing the gas inside the cabinet; on the other hand, the convective airflow forms a wind curtain, which plays a role in protecting the experimenter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0018] Figure 1 It is a structural schematic diagram of the intelligent fume hood of the utility model.

[0019] Figure 2 It is a schematic diagram of the body of the intelligent fume hood of the utility model.

[0020] Figure 3 It is a schematic diagram of the filter screen of the intelligent fume hood of the utility model.

[0021] In the figure: 1. cabinet; 2. hood; 3. filter; 4. pipe; 5. vent plate; 6. machine body; 7. lower pressure block; 8. box body; 9. notch. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the utility model, rather than all embodiments.

[0023] In the description of the present utility model, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 scope of protection of the present utility model. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] like Figures 1 to 3 As shown, the utility model intelligent fume hood includes:

[0025] Cabinet 1; negative pressure end: a negative pressure fan that generates negative pressure and an exhaust hood 2; positive pressure end: a positive pressure fan that generates positive pressure and a filter 3 that can be detachably installed at the air inlet of the positive pressure fan; feedback end: a photosensitive diode and a controller that detects whether the filter 3 is installed in place, and the photosensitive diode is electrically connected to the controller; the photosensitive diode is fixedly installed on the body 6 of the positive pressure fan, and the controller is electrically connected to the timer, and the mesh size of the filter 3 is selected according to actual needs.

[0026] The negative pressure end is opposite to the positive pressure end, and the negative pressure end and the positive pressure end are arranged on both sides of the cabinet 1. The positive pressure fan blows air and blows directly to the negative pressure end. On the one hand, according to the Bernoulli equation, the greater the flow rate, the greater the wind pressure, so that the wind pressure inside the cabinet 1 is much greater than the wind pressure outside the cabinet 1, so that the air outside the cabinet 1 enters the cabinet 1, preventing the experimenter from breathing the gas inside the cabinet 1; on the other hand, the convective airflow forms a wind curtain to protect the experimenter.

[0027] It should be noted here that air curtains can isolate gas exchange, such as the air curtain machine installed above the entrance of a shopping mall.

[0028] It should be emphasized that: when the filter 3 needs to be cleaned, the filter 3 is taken out from bottom to top, and after the filter 3 is cleaned, the filter 3 is inserted into the body 6 of the positive pressure fan from top to bottom. When the filter 3 is installed in place, the photodiode can be blocked to put it in an open circuit state, thereby ensuring that the filter 3 is installed in place. The timer can count, and when the set time comes, an alarm can be used to remind you to replace the filter 3. The timer can be a 555 timing device, and the controller can be a PLC controller.

[0029] Air induction plates 5 are installed on both sides of the cabinet 1. The length of the air induction plates 5 is one third to two thirds of the length of the cabinet 1. The air induction plates 5 play a role of shielding and sealing.

[0030] The negative pressure fan is connected to the induced draft hood 2 through a pipe 4, and an air treatment device can be connected to the negative pressure fan, as described in Chinese patent application number 202321611566.9. As the prior art in this field, this application will not repeat it.

[0031] The upper end of the filter 3 is fixedly connected to the lower pressing block 7, and the lower pressing block 7 is detachably connected to the body 6 of the positive pressure fan; a protective net is installed on the body 6 of the positive pressure fan to avoid damage to the filter 3, and a box body 8 is fixedly installed on the body 6 of the positive pressure fan. The height of the box body 8 is slightly higher than the height of the body 6 of the positive pressure fan, and the width of the lower pressing block 7 is slightly wider than the width of the filter 3. A cushion, such as a sponge, is installed on the edge of the lower pressing block 7. Its main function is to increase the thickness of the edge of the lower pressing block 7. When it contacts the box body 8 slightly higher than the height of the body 6 of the positive pressure fan, it is deformed, which can play a better shielding role and avoid misjudgment of the photosensitive diode; on the side close to the box body 8, a notch is provided on the lower pressing block 7. When replacing the filter 3, it is more convenient to apply force through the notch, and it can also indicate that force is applied there, so that the lower pressing block 7 is first detached from this side, and the photosensitive diode is more sensitive to light.

[0032] The positive pressure fan blows air directly toward the negative pressure end. On the one hand, according to the Bernoulli equation, the greater the flow rate, the greater the wind pressure, so that the wind pressure inside the cabinet 1 is much greater than the wind pressure outside the cabinet 1, so that the air outside the cabinet 1 enters the cabinet 1, preventing the experimenter from breathing the gas inside the cabinet 1; on the other hand, the convective airflow forms a wind curtain to protect the experimenter.

[0033] The standard parts used in the utility model can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0034] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. An intelligent fume hood, characterized in that: include: Cabinet; Negative pressure end: negative pressure fan and induced draft hood that generate negative pressure; Positive pressure end: a positive pressure fan that generates positive pressure and a filter that can be detachably installed at the air inlet of the positive pressure fan; Feedback end: a photodiode and a controller for detecting whether the filter is installed in place, wherein the photodiode is electrically connected to the controller; The photosensitive diode is fixedly mounted on the body of the positive pressure fan; the negative pressure end is directly opposite to the positive pressure end, and the negative pressure end and the positive pressure end are arranged on both sides of the cabinet.

2. The intelligent fume hood according to claim 1, characterized in that: Air ducting plates are installed on both sides of the cabinet.

3. The intelligent fume hood according to claim 1 or 2, characterized in that: The negative pressure fan is communicated with the induced draft hood through a pipeline.

4. The intelligent fume hood according to claim 3, characterized in that: The upper end of the filter screen is fixedly connected to the lower pressing block, and the lower pressing block is detachably connected to the body of the positive pressure fan.

5. The intelligent fume hood according to claim 4, characterized in that: A protective net is installed on the body of the positive pressure fan.

6. The intelligent fume hood according to claim 1, characterized in that: The controller is electrically connected to the timer.

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