Types of pressure steam sterilizer
According to the different ways of discharging cold air, pressure steam sterilizers are divided into two categories: lower exhaust pressure steam sterilizers and pre-vacuum pressure steam sterilizers.
Bottom exhaust pressure steam sterilizer is also called gravity displacement pressure steam sterilizer. Its sterilization is based on the principle of gravity displacement, which makes hot steam flow from top to bottom in the sterilizer and exhausts cold air from the bottom. The discharged cold air is replaced by saturated steam, and the latent heat released by the steam is used to sterilize the items.
The sterilization principle of the pre-vacuum pressure steam sterilizer is to use a mechanical vacuum method to form a negative pressure in the sterilization cabinet, and the steam can quickly penetrate into the inside of the article for sterilization. According to the number of times of vacuuming, it is divided into two types: pre-vacuum and pulsating vacuum. The latter is vacuumed multiple times, air removal is more thorough, and the effect is more reliable.
The pressure steam sterilizer can use external pipeline steam, or use the electric steam boiler matched with the pressure steam sterilizer to produce steam at any time. Some small down-exhaust pressure steam sterilizers can also heat the water in the sterilization pot through an electric stove or a gas stove and make it generate steam to achieve the purpose of sterilization. Generally speaking, the steam source of external pipeline steam is sufficient, which is suitable for larger pressure steam sterilizers. The amount of steam produced by electric steam boilers per unit time is usually small and requires a longer heating time.
According to the position of the steam pipe in the sterilization pot, there are jacket type and sleeve type. The steam pipe of the former is outside the cavity of the sterilization pot, which is a classic way. Features of bacteria pot maintenance. The latter's steam pipe is in the sterilization pot cavity, which has the characteristics of more convenient processing, wide heat transfer area, and more direct and rapid heating.
Since the volume of the pressure sterilizer is related to the sterilization effect and monitoring methods, the International Committee for Standardization classifies pressure steam sterilizers with a volume less than 60 liters as small pressure steam sterilizers. According to the shape characteristics of the sterilizer, there are differences between vertical, horizontal, desktop, and mobile pressure steam sterilizers.
