The classification of the negative pressure system in dentistry and piping
In recent years, the application of negative pressure suction system in dentistry is becoming more and more widely used, but many dentists do not fully understand it, this article on the classification of negative pressure suction system in dentistry and piping for a simple explanation. In order to facilitate the selection and pre-preparation. Classification of oral negative pressure system currently has two different classifications. One classifies the oral negative pressure system into two categories: dry and wet. The other categorizes negative oral pressure systems into dry, wet, and semi-dry. The former classification is based on the presence or absence of liquid in the tubing, with the presence of liquid in the tubing being the wet type and the absence of liquid in the tubing being the dry type. The absence of liquid in the tubing means that the liquid has been separated from the treatment machine. Although this classification appears to be simple and easy to determine, it does not cover the different negative pressure systems well. The following highlights the classification into three categories.
1. Dry, the device that generates negative pressure is an air ring pump, and the air-liquid separation takes place inside the treatment machine. There is no liquid in the tubing.
2. Semi-dry type, the device that generates negative pressure is an air ring pump, gas-liquid separation is centralized, and there is liquid in the pipeline.?
3. Wet type, the device to generate negative pressure is a liquid ring pump, there is no need for gas-liquid separation device in the treatment machine, and the equipment needs to be connected to the tap water.
Dry negative pressure system is mainly used for equipment has been installed in the gas-liquid separation device, or negative pressure equipment can only be installed on the roof of the building and other higher than the plane of the treatment machine location. Some people think that it is a mistake to use a dry system for the sake of hygiene, because although there is no liquid in the pipeline of the dry system, but the separation device is scattered and located in the treatment machine, once there is a leak will leak in the treatment room. The negative-pressure system, on the other hand, is not likely to leak because of the negative pressure in the piping, even if the piping is broken.
The wet negative pressure system uses a water ring pump, which is characterized by a high negative pressure value and a small flow rate. It is usually used in cases where there are more surgeries and the suction is mainly liquid, and can be used in outpatient operating rooms, etc.?
Semi-dry negative pressure system, the current mainstream negative pressure system. The air ring negative pressure pump ensures sufficient flow to prevent cross-infection and avoid the spread of respiratory diseases between doctors and patients. Centralized gas-liquid separation saves costs. It is also easier to install heavy metal collection devices. Semi-dry negative pressure system of gas-liquid separation device can be divided into precipitation and centrifugal separation.
Figure 1 shows a comparison of the negative pressure values and flow rates of three different negative pressure systems.
After understanding the classification of the negative pressure system in the oral cavity and then talk about the piping layout of the negative pressure system. Mainly for stomatology, large dental hospitals need professionals to design piping. Three different classifications of the pipeline layout requirements are slightly different, different companies' equipment on the pipeline requirements are not the same.
The layout of the pipeline has a few basic principles, the first is the principle of pipeline coarsening, usually used in the room of the treatment machine ∮ 30, the main road of the dental department usually use # 50 main road. Dental hospitals according to the size of the main line to be thicker. In addition, the pipeline is required to avoid 90-degree corners, and two elbows can be used in the way of transition. All corners are required to follow the flow to a 45-degree corner. See Figure II.
The need and piping at the same time lining up the signal line, signal line using parallel connection method, it is recommended to use more than 1.5mm copper core line.?
Dry system because there is no liquid in the pipeline, so the negative pressure equipment can be placed above the level of the treatment machine. Semi-dry and wet systems should, in principle, be placed at the same level as the treatment machine or downstairs. If they are placed at a slightly higher level (e.g. on a countertop), they should not exceed 1.5 meters above the level of the treatment machine in principle. When it is necessary to cross over the previous piping when draining, the near-negative pressure pump piping should pass underneath.
Semi-dry system requirements vary from company to company, Comet|Delta recommends a star-shaped approach to piping. Each treatment machine has a separate line to the negative pressure pump. See Figure III.