What is the difference between normal pressure and high pressure of diesel filter?

What are the differences?

The pore size of the filter is different, and the substances it selectively filters are different. The diesel filter mainly filters suspended solids and particulate matter, and the filter pore size is small because the viscosity of diesel fuel is small and the fluidity is good. The oil filter is mainly to filter colloidal substances in the working oil, filter debris caused by mechanical wear, etc., due to the large viscosity of the oil, so the pore size of the filter element is also larger.

In addition, high-quality filters have a "selective filtration" function, which selectively filters impurities in the fluid according to the specific needs of the filter. Therefore, it is necessary to choose carefully among filter products.

The role of an oil filter.

An oil filter is a device to protect the engine, including a primary filter and a secondary filter. The oil filter can remove impurities such as dust, metal particles, carbon precipitates and soot particles in the oil, with strong filtration ability and low flow resistance, but low filtration efficiency.

Under normal circumstances, all parts in the engine are lubricated by the oil to achieve normal operation, but the metal debris generated during the operation of the parts, the dust that enters, the carbon deposits that are oxidized at high temperatures and some water vapor will continue to be mixed into the oil, and the service life of the engine will be reduced after a long time, and it may affect the normal operation of the engine in serious cases.

Therefore, at this time, the role of the oil filter is reflected. To put it simply, the function of the oil filter is mainly to filter most of the impurities in the oil, ensure the cleanliness of the oil, and prolong its normal service life. In addition, the oil filter should also have strong filtration capacity, low flow resistance, and long service life.

The role of a diesel filter.

There are three types of fuel filters: diesel filters, fuel filters and gas filters. Its function is to filter out harmful particles and moisture in the engine fuel gas system to protect the oil pump nozzle, cylinder liner, piston ring, etc., reduce wear and avoid clogging.

Generally, there are various impurities in gasoline, and the fuel tank will also precipitate a certain amount of dirt when used for a long time, and the above reasons will affect the quality of gasoline. The function of the gasoline grid is to filter the above-mentioned impurities, and the gasoline in the fuel tank reaches the combustion chamber of the engine through the filtration of the gasoline grid, and its cleanliness and purity can be effectively guaranteed.

Atmospheric pressure is a standard atmospheric pressure, and the difference between internal and external pressure is zero pa. High pressure, on the other hand, is greater than one atmosphere. The difference between internal and external pressure is not zero, and it can be negative or positive.

Hello! Of course, the diesel filter is to filter a lot of diesel impurities, of course, there is no atmospheric pressure or high pressure in theory, but there is a diesel pump in the middle to accelerate, of course, to meet the supply of diesel, of course, there are fine, coarse filtration.

Vacuum filtration (air filtration): filter with a Brinell funnel or glass sand core funnel installed on the suction filter bottle and spread with filter paper, the suction filter bottle branch pipe is connected with the suction device, the filtration is carried out under reduced pressure, and the filtrate flows through the filter paper or sand core under the action of the internal and external pressure difference to achieve separation. In addition, the two are not the same in terms of filtering objects and speeds.

Follow-up: So what's the difference between the two in terms of what they filter on??? Vacuum filtration:

It is not suitable to filter colloidal precipitation and precipitation with too small particles, because colloidal precipitation is easy to penetrate the filter paper, and the precipitation of too small particles is easy to form a dense layer of precipitation on the filter paper, and the solution is not easy to filter through atmospheric pressure: it is generally applicable, filter paper is selected according to the nature of precipitation, and medium-speed filter paper is generally used for coarse crystalline precipitation, slow-speed filter paper is used for fine-grained or aquatic precipitation, and fast filter paper is applied when the precipitation is colloidal.

Autoclaving, also known as autoclaving, requires certain sterilization equipment, i.e., autoclaves. It is proportional to the temperature of the steam and the steam pressure, through the pressure to increase the temperature, the use of high temperature steam for sterilization, sterilization, sterilization, the best effect and can greatly shorten the sterilization time, is the most effective, the most widely used sterilization method.

Atmospheric steam sterilization is currently the most widely used sterilization method in the large-scale production of edible fungi, which can be used in steamers, steamers, iron buckets, soil steaming stoves, etc. The capacity can be large or small, and the structure can be adapted to local conditions, which is economical and practical. When sterilizing, bottles and bags should be placed in an orderly manner and leave a certain gap, and sterilize with 100 circulating steam.

The temperature of the circulating steam generally does not exceed 100, so it can only kill microbial propagules, but cannot completely kill spores and spores. Atmospheric steam sterilization must take more than 8 hours or more. After the end of sterilization, the stove door can only be opened when the temperature drops below 70, otherwise it is easy to cause the bag to be thuffed and thinned and scrapped.

The disadvantages of atmospheric sterilization are that the sterilization time is long, the energy consumption is large, the water is easy to boil dry or need to be continuously added, and the slightest carelessness is easy to cause incomplete sterilization.

Generally, the oil pressure of the low-pressure oil circuit is 3-5bar, the high-pressure oil circuit is 250bar-1000bar, and the nozzle pressure of the common rail system can reach 1400bar or even higher.

The advance angle is large at start-up, generally 8-12 degrees, but due to the emission problem in normal operating conditions, it is generally controlled within 6 degrees, and about 3 degrees at low speed and small load.

These depend on the model, which are available in the manual.

The comparison of supercharging and general pressure can be imagined, and the supercharger is definitely greater than the normal pressure, that is to say, the supercharger plays a role in increasing the pressure, so you must be clear about the point of supercharging, and the increase is the intake pressure to increase the compression ratio, so as to achieve the function of increasing the explosive force and increasing the power.

As the name of Yuanrang Bi said, the difference is that the partial pressure of oxygen in hyperbaric oxygen is higher.

Principle: 1. The ability of the human body to absorb oxygen from the air into the blood from the alveoli is proportional to the partial pressure of oxygen in the air within a certain range.

2. Pressure: When the pressure of the bubbles in the body increases, its volume will shrink. Narrowing the scope of infarction.

3. Pressure vasoconstriction: hyperbaric oxygen has an adrenaline-like effect to constrict blood vessels, reduce local blood volume, and facilitate cerebral edema, and reduce edema after burns or crush injuries. It is important to note that although the local blood supply is reduced, the amount of oxygen brought into the tissues through the blood is increased.

4. Antibacterial effect: oxygen itself is a kind of hail celery broad-spectrum antibiotic, which is not only anti-anaerobic bacteria, but also anti-aerobic bacteria.

Atmospheric diesel refers to the diesel fraction extracted from the atmospheric pressure tower in the atmospheric and vacuum distillation, generally speaking, the saturated hydrocarbon content is higher, and if it is paraffin-based, the cetane number is also higher. However, due to the presence of some or a small amount of unsaturated hydrocarbon components, it is easy to be oxidized and discolored after a certain period of contact with the outside world. Catalytic diesel is a diesel fraction fraction obtained by catalytic cracking processing, which generally has a high content of naphthenes, aromatics and olefins, as well as a high content of sulfur and nitrogen, so it cannot be directly used in vehicles.

It is mainly used for blending with atmospheric diesel. It can be used on large machines. Hydrotreatment is required to qualify.

Hydrogenated diesel is a diesel fraction after hydrotreating, which refers to the removal of harmful impurities such as sulfur, oxygen, and nitrogen in the oil product into corresponding hydrogen sulfide, water, and ammonia under hydrogen pressure and catalyst, and the hydrogenation saturation of olefins and diolefins, and the hydrogenation saturation of aromatic hydrocarbons, so as to improve the quality of oil products. Sometimes, hydrorefining refers to the refining of light oil products, while hydrotreating refers to the refining and desulfurization of heavy oil products. The quality is relatively good, its stability is good, and it does not change color for a long time.

The low pressure is generally around, the high-pressure domestic engine is 19-22MPa, and the imported engine is generally around 20-25MPa; The specific pressure should be adjusted according to the engine manual.

It is not an EFI diesel engine, the fuel injection pump has a low pressure of 2 kg, and the high pressure does not exceed 220 kg square centimeter.

1. The nature is different.

Diesel fine filter is a diesel fine filter designed for the diesel engine that is commonly used in two-stage filtration, which together with the oil-water separator of diesel fuel constitutes a two-stage filter. Filter refers to the accessory that filters impurities or gases through filter paper.

2. The role is different.

The oil-water separator is used to filter the water in the diesel, and the diesel fine filter is the fine particles in the diesel.

3. The principle is different.

The structure of the fuel filter is composed of an aluminum shell and a bracket with stainless steel inside, which is composed of a high-efficiency filter paper sheet, which is chrysanthemum-shaped to increase the flow area. As the main filter in the two-stage filtration, the diesel fine filter is also the last line of defense for impurity filtration, and has high requirements for filtration efficiency and service life.

The function of the oil-water separator is mainly to separate the water in the diesel fuel, and the fine filter is to filter the tiny impurities.