Here is a list of common problems and lists that users are concerned about when using pressure and vacuum pumps, I hope it can be helpful to you.
- Can the micro pressure and vacuum pump work in a low temperature environment?
- Can the pressure and vacuum pump work in a corrosive environment?
- Can the micro air pump pump vacuum and compress air at the same time?
- How to inflate and deflate the airtight container through the pressure and vacuum pump?
- Why configure a vacuum pump for the suction cup should choose a pump with high vacuum and large flow as much as possible?
- How long is the service life of the pressure and vacuum pump? How is the life value determined?
- Can the micro pressure and vacuum pump re-start under pressure?
Q：Can the micro pressure and vacuum pump work in a low temperature environment of -30 degrees?
A: Customers in cold areas often ask whether our pressure and vacuum pump can work in low temperature environment. In winter in northern China, the outdoor temperature is usually below 0°C, and the lowest temperature is below -30°C. However, when the micro air pump is shut down in this low temperature environment, most of the internal parts such as rubber parts, lubricating grease, etc. have been frozen, which makes it difficult to start after power-on. At the same time, the electronic devices inside the micro pump also need to overcome low temperature, condensation and other harsh conditions. In the past, in the face of such application scenarios, we would recommend customers to take heat preservation measures for the pump and keep the pump running without stopping, because as long as the pump stops at low temperature and is completely frozen, there is a risk that it will not be able to start.
At present, we have also broken through the technical difficulties of this application, and have launched low-temperature micro-pumps that can work in low-temperature environments, such as D17 series pressure and vacuum pump and D25 series pressure and vacuum pump. The minimum working environment temperature can be about -30 ℃, And can achieve continuous use and reliable and stable start-up at extremely low temperatures. Customers with such needs can contact us to consult related products and technologies.
Q: Can the pressure and vacuum pump work in a corrosive environment?
A: Regarding the extraction and transmission of corrosive media by micro diaphragm pressure and vacuum pump, we have mature solutions, which can provide customized services for corrosion-resistant materials, can resist most organic and inorganic solvents, and can meet the application requirements of most complex media.
The application scenarios of corrosive environment actually have a greater impact on the life of the pump, and it is still an application problem that is not easy to solve. For example, when ordinary pressure and vacuum pumps are used in chemical plants filled with corrosive gases, the plastic pump body and rubber diaphragm of the pump may not be corroded, but the exposed metal mechanical parts such as motors and bearings may be corroded. For customers with applications in corrosive environments, we will suggest that customers add a sealed protective box to the pump to slow down the corrosion of metal parts by corrosive gases.
Q: Can the micro air pump pump vacuum and compress air at the same time?
A: Our pressure and vacuum pumps are all diaphragm air pumps, with 2 air nozzles, an air inlet and an air outlet. The motor drives the diaphragm to reciprocate through the connecting shaft. When the diaphragm expands, a negative pressure is formed at the air inlet and inhaled. Gas; when the diaphragm is compressed, a positive pressure is formed at the exhaust port and the gas is discharged. When the motor runs at a high speed, a stable negative pressure and positive pressure can be formed at the inlet and outlet ports. Therefore, our pressure and vacuum pump is vacuuming compressed air at the same time. It should be noted that when it is necessary to pump air at the exhaust end and there is positive pressure at the exhaust end at the same time, it is necessary to choose D series products, such as D15, D23, D35, D50, D60 and other series products. The C series vacuum pumps can only be used for pumping, and their application scenarios are different.
Q: How to inflate and deflate the airtight container through the pressure and vacuum pump?
A: The micro diaphragm pressure and vacuum pump can be used to inflate to create positive pressure, and it can also be used to exhaust and vacuum. However, the diaphragm micro-pump air pump is a reciprocating pump, and there is a one-way valve inside to make the airflow flow in one direction, so it cannot be directly reversed by the motor to reverse the airflow. Therefore, the pump cannot directly realize the inflation and deflation, and can only realize the switching of the pumping and exhausting paths by changing the external air path. How to inflate and deflate a closed container? Option 1: Inflate the airtight container through a positive pressure air pump, and set a deflation valve to deflate the airtight container. Option 2: The airtight container is inflated or evacuated by a micro positive and negative pressure air pump, and the switching of the exhaust path is realized by setting a two-position four-way valve or four two-position two-way valves. If you want to achieve electronic control, it can be achieved by adding pressure sensors, solenoid valves and control circuits.
Q: Why configure a vacuum pump for the suction cup should choose a pump with high vacuum and large flow as much as possible?
A: According to the theoretical formula of pressure F=S*P (F is the theoretical suction force, unit: Kgf; S is the contact area, unit: cm2; P is the absolute value of the relative vacuum degree, unit: Kgf/cm2), it can be known that the adsorption force and the The absolute value of the relative vacuum of the vacuum pump is proportional to the absolute value. Therefore, it is necessary to select a pump with a high absolute value of relative vacuum. In actual vacuum cup applications, other influencing factors need to be considered. The size of the adsorption force has nothing to do with the flow rate of the pump in theory, but it is related to the flow rate in actual use. The first reason is: the entire suction cup air system cannot be absolutely sealed, and there is always a certain leakage. Such as: pipeline leakage, air leakage at the joint between the vacuum suction cup and the workpiece surface, and the fit between the suction cup and the workpiece mainly considers the material of the suction cup and the smoothness of the workpiece. This effective measure to make up for leakage includes choosing a vacuum pump with a larger flow. The second reason is that the adsorption efficiency of a vacuum pump with a large flow rate is higher than that of a pump with a small flow rate, and the theoretical adsorption force can be achieved at a faster speed.
Q: How long is the service life of the pressure and vacuum pump? How is the life value determined?
A: For the micro pump industry, there is no unified specification for the nominal product life. Different manufacturers generally use the following internal specifications: product life, motor life, complete machine life, operating life, etc., according to the motor, material, bearing used. , structure, load, etc., generally ranging from hundreds to tens of thousands of hours.
When Hilintec test and determine the product life, we adopt the test method of “continuous operation of the whole machine under the maximum rated load”, that is, the life value obtained from the test under the worst working condition and 24 hours of uninterrupted continuous operation under the maximum load.
Unless otherwise specified, the life test method of our C/V series micropumps is as follows: completely block the exhaust port, make it work under the maximum negative pressure condition, work continuously for 24 hours in a clean and non-corrosion laboratory, regularly measure the parameters and Record the operating status. The test method of our D/F series micropump is: completely block the air outlet, make it work under the maximum positive pressure condition, work continuously for 24 hours in a clean and non-corrosion laboratory, measure the parameters and record the operating status regularly; The test method of the S/W series diaphragm liquid pump is as follows: the inlet and outlet ports are placed below the surface of the clean water to make it continuously transmit the liquid, and it will work continuously for 24 hours in a clean and non-corrosive laboratory, and regularly measure the parameters and record the operating status;
Our pump of the same model is usually divided into three versions, simplified version, standard version, and quality version. Different versions have different lifespans. Generally speaking, the simplified version has a lifespan of more than 2500 hours, the standard version has a lifespan of more than 6000 hours, and the quality version has a lifespan. More than 9000 to 10000 hours, it is a high reliability product that can run continuously for a long time. It should be noted here that since our company’s test is tested and rated under the worst working conditions, under the condition of small load and intermittent use, the life of the micro pump will be greatly increased, and the actual service life can reach the nominal value of 2 -3x or more.
Q: Can the micro pressure and vacuum pump re-start under pressure?
A: Before answering the question of whether it can be started under pressure, you need to know two parameters: the specific pressure value in the use scene; the maximum relative pressure that the pump can achieve. When the actual negative pressure value of the operating environment exceeds the relative vacuum degree of the pump, it is difficult to start up. For example, if the environmental negative pressure is -50kPa, the maximum relative vacuum degree of the pump can only reach -30kPa, and the pump is in negative When the pressure value is higher than the rated value, when starting, it is in a working condition that exceeds the limit load. In this case, the pump may not be able to start. On the contrary, if the negative pressure of the environment is -30kPa, and the maximum relative vacuum degree of the pump can reach -50kPa, in this case, the load of the pump is less than the nominal rated value of the product, and most models of our vacuum pumps can be started. The same applies to the air compressing pump. The rated working pressure of the air pump must be higher than the ambient pressure of the pipeline before it can be started.
It should be noted that many pressure and vacuum pump of other brands on the market cannot be started under rated vacuum or pressure. For customers who have special requirements for start-up characteristics under load, please consult our pre-sales engineers for detailed information.