Volume vacuum pump pressure in foundation stress and limit standard how to distinguish? - - - - - -

volume vacuum pump has a lot of product standards and specification experimental way, some of them are many years did not change, some of them are in recent years has carried out the revised, but there are some aspects to scientific research and discussion. ISO also announced some new standards, must be based on the details in our country to carry out the implementation of the optional. For the matter, according to people for many years of practice and scientific research, clearly put forward some new views and opinions.

basic pressure and ultimate pressure

1. Description and definition of

to define the ultimate pressure is: water pump is equipped with a standard cover and standard work according to the regulation, not imported gas under normal working conditions of all the minimum pressure for leveled off. In other words, it is an infinite line values, just like in mathematics infinitesimal, it is an independent variable, it is not always in the change process to limit and the least, is a can't measure the value of the.

as ISO21360 - 2007, extreme pressure is testing enclosure gradually the pressure value, it is the least pressure pump can be obtained, but there is not a specific way of measuring or standard. Therefore, people usually measure to limit the pressure, just assume that, for evaluation of human factors limit pressure value, it has no practical significance.

ISO21360 - 2007 explicitly put forward a new concept - — Basic pressure, it is defined as: mechanical pump and detect cover do after work in the standard, test the pressure inside the cover. Emphasize again, general test specific areas cover measure of pressure is essential. People think it insufficient definition said too clear, accurate, and no comprehensive.

people feel pressure basic right should be defined: 'pump standard work, according to the regulation is not import under the condition of the gas, specification test enclosure steady pressure'. It and protect the definition of the limit pressure of first phase is, the definition of basic pressure to cancel the important word 'at least', also is not the meaning of the limit, thus, it is a able to measure the value of the, although is leveled off, but it had not been far from smooth.

2。 Basic pressure measuring

pump standard work, according to the regulation is not import under the condition of the gas, the least run lh ( Gas ballast pump should be under the condition of gas ballast in advance at least run lh) , once every 30 min spacing measurement test enclosure pressure, when pressure measurement conclusion continuous three times has no change, namely think did basic pressure, pressure and motor rated power measurement should be carried out. Gas ballast pump should be after it is measured, completely open air valve and pump temperature stable when measuring gas ballast again after the basic pressure.

3。 Measuring instrument panel

partial pressure have been measured with narrow type vacuum gauge, its cutting fluid is mercury, give full consideration to air pollution, application attaches great importance to limit and prohibit international mercury, larger mercury in our country manufacturing industry of application - Chlor-alkali chemical manufacturing industry has established the overall planning of heavy metal pollution prevention timetable, l - 202 In the next decade for mercury-free link. Forbidden application period of mercury will eventually arrived, but so far haven't a dashboard can replace it to measure the partial pressure immediately, so the work must be carried out quickly. At present, proposed using film vacuum gauge ( Add cold trap) To measure the partial pressure, or drop the partial pressure is the decisive assessment and measurement, due to the partial pressure of the practical significance for the customer how much is not good, many overseas enterprises have also been cancelled partial pressure index.

the motor rated power measured by thin film vacuum gauge. Film is common in vacuum gauge differential protection type double film capacitor, it not only measuring precision, and measuring the low limit reached 10 - 3Pa。 It has a high vacuum pump standard bellows, film meter range in fact is the controller of the results of the measured value with the standard bellows relatively, standard bellows because the deposit has deflated and leakage, which, the decrease of vacuum value will be very slow, and thin film of zero shall often conduct correction, especially to the low measurement range 1 torr ( 133Pa) And 0. 1Torr( 13Pa) Controller, its harm is bigger, so the standard bellows should be based on actual condition, immediately to carry out the high vacuum pump to solve or conversion.

there are also a bit, be sure to keep an eye on the membrane vacuum gauge in applications, the low measurement range controller must not be filled into the air, even during the outage period, must maintain under the condition of high vacuum pump, also cause a permanent deformation, pulse dampers in case damage film vacuum gauge measurement accuracy.

thermal conductivity vacuum gauge analysis from the structure, measurement accuracy, it should have a good sales market among all kinds of vacuum gauge relative deviation is very large, even among the same manufacturer production and manufacturing of vacuum gauge is also a similar problem, and application of the unit must have to correct the machine equipment, on time to carry out the correction, to ensure that the thermal conductivity vacuum gauge measurement accuracy, can consider the provisions of the pump characteristic measurement.

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