Common positive pressure ventilation cooling generally refers to the central air conditioning, cabinet air conditioning and environmental protection air conditioning. The first two types of air conditioning are generally very familiar, mainly in the confined space to release cold air, as a way to neutralize the original hot air, this ventilation cooling is more passive, the amount of air exchange is also very limited. Therefore, it often leads to very stuffy air, and stuffy is mainly lack of oxygen. Another defect is the use of this air conditioning needs to be supplemented with water, or the human skin will shrink. We often say that the air conditioning disease, that is, the human body lack of oxygen, skin contraction, and even some people's eyes will be dry, itchy, throat will be difficult. The second positive pressure ventilation is environmental protection air conditioning, that is, by the fan and water curtain cooling, through the pipeline will be cold air into the room, and the central air conditioning, cabinet air conditioning, it is also in the room to increase the cold air, as a way to neutralize the hot air to achieve the cooling effect. Unlike the above two types of air conditioning, this ventilation does not need to close the windows and doors, the indoor air will automatically diffuse. Therefore than the above two air conditioning air quality will be better, but also do not need snow, environmental protection air conditioning so named. Negative pressure ventilation is a prerequisite for a relatively sealed space. Negative pressure fan on one side of the wall to force the indoor air out, will form an instantaneous relative vacuum (negative pressure), the other side of the wall mounted curtains have a lot of small holes, the outdoor air in the atmospheric pressure (do not look down on the atmospheric pressure ah, in fact, the pressure is very large, we do not feel that is because we are adapted to this pressure) under the automatic inflow of the indoor. Therefore, the air is constantly circulating with the outdoors. If the installation is appropriate, all the air indoors will participate in this great cycle. Thus for dirty, smoky, dusty, odoriferous rooms, this mode of ventilation is the most thorough. Considering the input cost, some customers will just choose the negative pressure fan without installing the cooling water curtain. At this time the air opposite the fan enters through the door and window without cooling treatment. The indoor air flow will also have a better cooling effect. Let's start with axial flow fans. This type of fan might as well be called positive pressure. It is like a high-pressure faucet, the head and pressure is an important index of it. The air volume of this kind of fan is generally small, and the power of about 1KW is about 10000M3/H. Used for blowing wind effect is very good. People standing across the fan will feel the strong airflow. But for the extraction of air but the effect is very poor. We have met many customers who have installed a large number of axial fans in their high-temperature plants. But the workshop is still so hot and stuffy, still so much dust and odor. What is the reason? If you stand next to the axis of the axial fan, you can not feel the airflow, although the axis of the wind is very large. His airflow is linear. For the surrounding air can rarely drive. Just like a high-pressure faucet spraying water, standing on the side of the water flow, your body will not be wet. The negative pressure fan is different. Negative pressure fan is like a reverse sprayer, it is the absorption of air is flared, and not only drive the fan axis of the airflow, but from the fan to the outside of the flared roll air, we stand next to the axis of the fan will also feel the strong airflow. This characteristic determines its exhaust thoroughness and high efficiency. Another important point, when installing the negative pressure fan, the wall on this side of the fan must be well sealed. In particular, there should be no gap around the fan. We often see a lot of customers to install a lot of negative pressure fan, but the workshop is still very stuffy, they then concluded that the negative pressure fan also has no effect. I went to see a lot of sites, often a very large window, after the installation of a fan, the fan next to the window are open. It can be imagined that a large amount of air is just circulating around the fan, and of course it cannot absorb the air from the far side of the workshop. Installation of negative pressure fan is the most ideal way, fan this side of the wall and the nearby doors and windows are closed, fan the opposite wall of the doors and windows open, to ensure that the air flow is a straight line flow.
How to simply understand what is a vacuum, negative pressure and vacuum there is no difference
Negative pressure and vacuum or the difference between the vacuum and vacuum is definitely negative pressure, but negative pressure is not necessarily a vacuum
Vacuum is the complete absence of air, absolute blank
Negative pressure is just the pressure is lower than the pressure of the atmosphere
Cupping device pumping gas, but you can not completely pumped up, so only negative pressure is not a vacuum
Cupping device pumping gas, but you can not be completely pumped up.
Negative pressure is just pressure lower than atmospheric pressure
The cupper draws gas, but you can't pump it all out, so it's only negative pressure, not vacuum
What does it mean when the machine that presses the hydraulic hose has 1.2.3.4.5.6.7.8.9.10. written vertically on the far left side? What does it mean
The word "scale" is written on the top, and the machine should have a gear for this adjustment.
Will XP be able to utilize the hardware more fully than 98, so that games run smoother?
As a system that has been in service for more than a decade, it has seen its homecoming. Now, netizens around the world can't help but stand in awe of this system that has tenaciously existed in microsoft for more than a decade. Only by constantly exploring, experimenting and innovating can we make the system run more humanized. This is something that XP cannot match with 7 and 8.1.
What does the machine parameter for air compressor pressure 1.4bar mean?
Pressure 1.4bar is the rated discharge pressure of an air compressor. 1.4bar is medium pressure. The rated discharge pressure of air compressor is divided into low pressure (0.7~1.0MPa), medium pressure (1.0~10MPa), high pressure (10~100MPa) and ultra-high pressure (more than 100MPa). 0.7~1.0MPa), medium pressure (1.0~10MPa), high pressure (10~100MPa) and ultra-high pressure (more than 100MPa). 1.4bar belongs to medium pressure. Bar belongs to medium pressure.
Injection molding machine 160 grams of machine pressure and speed correction explain MAX MIN What does it mean
max is the maximum flow and pressure of the current output, min is the minimum output, the pressure, flow set to the maximum, and then adjust the max adjusted to 0.8a current can be adjusted, the minimum current adjusted min adjusted to 0.1 or so, and then the pressure and flow of the linearity. Adjustment to enter the computer internal password page carefully adjusted
The use of vacuum negative pressure safety valve
A72W-10P/R vacuum negative pressure safety valve is suitable for temperature ≤ 200 ℃ negative pressure system, when the negative pressure in the container exceeds the permissible value, the vacuum negative pressure safety valve is automatically opened, inhalation of air; when the negative pressure in the container reaches the permissible value, the A72W-10P/R vacuum negative pressure safety valve is automatically closed, so as to prevent the negative pressure in the container from exceeding the permissible value, and then the negative pressure safety valve is automatically closed. When the negative pressure in the container reaches the permissible value, A72W-10P/R vacuum safety valve closes automatically, thus protecting the equipment and system. This product is generally installed in the normal non-negative pressure system, when the container and the system of the discharge valve is not open, negative pressure, vacuum negative pressure safety valve will automatically open to protect the equipment from damage.
What is the meaning of gas pressure
Air compressor, storage tank pressure value is the gas pressure, that is to say, the machine that produces the gas and the gas source to store the pressure of the gas, it is called the gas pressure, according to the size of the pressure output from the gas source, can supply different pneumatic equipment, such as pneumatic wrenches, automobile brakes system, air drills, wind picks, paint spray guns and so on. The unit of air pressure is generally: standard atmospheric pressure, air pressure at sea level under standard atmospheric conditions, 1 atmospheric pressure, the value of 101.325kPa, is the unit of pressure, recorded as atm. 1 standard atmospheric pressure = 760mm Hg = 76cm Hg = 1.01325 × 10^5Pa = 10.336m water column, 1 standard atmospheric pressure = 101325 N / m2, (in the calculation of) in the calculation is usually 1 standard atmospheric pressure = 1.01 × 10^5).
What is the meaning of temperature and pressure on the injection molding machine 50 points
Temperature setting of the first paragraph corresponds to the barrel nozzle, you see the largest value of the paragraph is the last section of the barrel.
Pressure is to see how many of your products can be used, for only set a few segments, do not have to set up each segment, for example, you can only use a segment of the injection and holding pressure can be qualified to produce the product, the other do not have to set up.