A kind of negative pressure weighing cover

Abstract

The invention discloses a negative pressure weighing cover. The negative pressure weighing cover is built by splicing and assembling an aluminum profile and a composite wall and comprises an upper box body, a machine room, a lower box body, a working area, a protection area and a supervision system. The supervision system is arranged on a control panel; a primarily efficient filter and a middle efficient filter are arranged on an air returning plate of the inner side of the lower box body; a UPS is arranged on the bottom corner of the lower box body; the machine room is provided with a main fan and a direct-current fan; an efficient filer A and an efficient filter B are arranged in the upper box body; the efficient filter A is sealed through a liquid seal trough, and an air outlet of the efficient filter A is provided with a flow equalizing diaphragm plate and a high-speed wind plate; and the high-speed wind plate is communicated with a high-speed wind curtain. A buffer partition plate is arranged in the upper box body. A double-area structure of the working area and the protection area is adopted, and the vertical one-way airflow and the double-side efficient filters are utilized, so that internal circulation and partial discharge of the working area are kept, negative pressure in the working area is made to prevent cross contamination, and external environment and safety of indoor personnel are protected.

Description

technical field [0001] The invention relates to the field of technical equipment for weighing powdery medicine or liquid medicine, in particular to a negative pressure weighing cover. Background technique [0002] Weighing hood is an open room specially used for pharmaceutical, microbial research and scientific experiments, etc. It is used for dust and reagent weighing and packaging. Most of the existing weighing rooms are used as weighing rooms after being cleaned by ordinary rooms. There is no corresponding air treatment system, and there is no supporting automatic control system. It is difficult to control dust, reagent spillage, rising, and pollution. Inhalation of dust and reagents is harmful to human health, and there is also cross-contamination of dust and reagents, which endangers the safety of the external environment and indoor personnel. [0003] The utility model patent with the patent number "201020695956.5" discloses a weighing room, which includes a room body...

AI Technical Summary

Problems solved by technology

Most of the existing weighing rooms are used as weighing rooms after being cleaned by ordinary rooms. There is no corresponding air treatment system, and there is no supporting automatic control system. It is difficult to control dust, reagent spillage, rising, and pollution. Inhalation of dust and reagents is harmful to human health, and there is also cross-contamination of dust and reagents, which endangers the safety of the external environment and indoor personnel

[0003] The utility model patent with the patent number "201020695956.5" discloses a weighing room, which includes a room body and a weighing platform. The flow cover is arranged in the room and above the weighing platform, the air outlet is arranged on the top of the room, the air outlet is arranged at the bottom of the room, and an exhaust fan is arranged outside the air outlet; although this patent has formed a simple air circulation system, but the structure of the whole system is too simple to complete the efficient purification and uniform speed control of the air, and it cannot really solve the problems of environmental pollution and cross-infection in the traditional weighing room

[0004] Existing negative pressure weighing hoods generally use high-efficiency filters for filtration. Because the distance between the weighing hood body and the high-efficiency filter is too large, it is easy to form a closed self-circulation, and the polluted air cannot be taken away, so it cannot reach 100. The effect of level laminar flow makes it difficult for the negative pressure weighing hood to meet the new GMP requirements; the disadvantages are: 1. The air pressure in the working area of ​​the weighing hood is usually the same as the outside air pressure, which is prone to cross contamination, and the cleanliness of the weighing hood cannot be guaranteed ; 2. Although the laminar flow and wind speed in the hood can be guaranteed in the ordinary weighing room, the pressure difference between the hood and the outside of the hood is positive, and the pollutant particles in other low-level clean areas will flow to the 100-level area in the hood and then pass through the layer. 3. During weighing, powdered drugs or liquids will float or overflow to other clean areas, and some weighing hoods are equipped with doors as partitions. The leakage of the seam will be more serious; 4. Although the negative pressure weighing cover is equipped with an exhaust system on the cover, it is difficult to achieve the negative pressure effect of preventing diffusion

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