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Industry Information
Seismic pressure gauges are used in petroleum geological drilling, cementing and fracturing equipment, etc.
2012-4-14 10:33:16

从外观要求、示值要求、耐震性能等方面阐述了耐震压力表在应用中的一些技术要求,系统地说明了其测试的过程及其方法。 The anti-shock pressure gauge expounds some technical requirements of the anti-shock pressure gauge in the application from the aspects of appearance requirements, indication requirements, and shock resistance performance, and systematically explains its testing process and method. Tests show that at the time of the pressure indication value check, the difference between the readings when the pressure is raised and lowered after tapping, and the change in the pointer indication value (including zero value) caused by tapping the case should not exceed the absolute value of the allowable basic error. (Or dial) should be stable within the full range of indexing, and there should be no jumping or stagnation. The error value of the pressure gauge pulsation should not be greater than 1.5 times the absolute value of the allowable basic error, which ensures the accuracy and reliability of the value transmission.

Shockproof pressure gauges are easily misaligned after working in a harsh working environment for a period of time. In order to ensure its safety and accuracy in use, it must be verified and tested. Anti-shock pressure gauge refers to a direct-indicating pressure gauge with filling liquid and damping elements in the case. (1) Main features. It has good shock resistance. It is especially suitable for the measurement of fluid pressure with severe pulsation or transient impact on the medium. Its transmission indicating mechanism is in a viscous damping fluid, which greatly reduces the impact of the mechanical vibration of the environment in which the instrument is located on its operation. It adopts a fully sealed structure and can work in harsh environments such as high humidity and dust and water. It has the characteristics of anti-blocking, which can be used for the measurement of high viscosity, easy to crystallize, solidify such as cement, mud and other media. (2) Structure and working principle. The working principle of an anti-vibration watch composed of a capsule diaphragm, a damper, an elastic element and an indicating mechanism. The pressure of the measured medium acts on the diaphragm and is transmitted to the damping liquid in the instrument cavity. Using the capillary channel throttling principle, the pressure pulsation is suppressed through the damper to become a stable pressure, which acts on the elastic element to cause displacement, and then indicates the measured pressure value. The working principle of an anti-vibration watch composed of a gasket, a diaphragm group, a fork spring, a transmission indicating mechanism, and a housing. The pulsating pressure of the measured medium acts on the diaphragm group through the gasket. The diaphragm group uses the capillary channel current limiting principle to suppress the pressure pulsation and become a relatively stable pressure. The pressure is converted into a concentrated force and acts on the fork spring through the mechanism. The fork spring is deformed. After being enlarged by the transmission mechanism, the dial is rotated to indicate the average value of the measured pulsating pressure. (3) Uses and scope of application. The meter can measure pulsating or static pressure. Used in petroleum geology, drilling, cementing, fracturing equipment, etc. The special anti-corrosion material of the parts in contact with the medium can measure the pressure of corrosive fluids such as strong acid and alkali.

在使用中的技术要求:2.1外观要求(1)新制造的压力表各部件应装配牢固,其可见部分应无明显的瑕疵,划痕。 Technical requirements for seismic pressure gauges in use: 2.1 Appearance requirements (1) Each part of the newly manufactured pressure gauge should be assembled firmly, and its visible part should be free of obvious flaws and scratches. The pressure gauge during use and after repair must not have defects and damages that affect the measurement performance. (2) The indexing numbers and symbols of the pressure gauge dial shall be complete and clear, and the indexing scales of the dial shall be evenly distributed. The pointer of the pointer pressure gauge should extend into all indexing lines. The width of the pointer end should not be greater than 1/5 of the minimum indexing interval. The distance between the pointer and the plane of the indexing plate should be within 1-3mm. (3) The sealing device of the pressure gauge should not be able to touch the internal parts without damaging the seal. 2.2 Indication requirements (1) When the pressure gauge is in the working position and not pressurized, the zero error of its pointer should meet The following requirements. For a pressure gauge with a zero limit stop nail, its pointer should be close to the limit stop nail, and the "shrinkage" must not exceed the absolute value of the allowable basic error. For a pressure gauge without a zero limit nail, its pointer must be within the width of the zero graduation line, and the width of the zero graduation line must not exceed twice the absolute value of the allowable basic error. (2) The accuracy level and allowable basic error of the pressure gauge should meet the requirements of the following table. (3) When the pressure gauge is in static measurement, its return error should not exceed the absolute value of the allowable basic error. (4) During static measurement of the pressure gauge, after tapping the case, the change of the pointer (or dial) indication value shall not exceed the absolute value of the allowable basic error. (5) During the measurement of the pressure gauge, the pointer (or dial) should be stable within the full range of indexing, and there should be no jumping or stagnation. 2.3 Shock resistance (1) The pulsation of the working medium. When the load is pulsating pressure, the pressure gauge should meet the following requirements: The ratio of the pointer (or dial) swing amplitude of the pressure gauge to the actual input pulsating load amplitude is the pressure reduction ratio, and its value is not greater than 0.5. For the adjustable damping type The pressure gauge should be tested at a fixed value of not more than 0.5. During the test, the reduction ratio must not be changed. If there are special requirements for the unit of use, the specific reduction ratio can be tested. The deviation between the average value of the pulsating pressure received by the pressure gauge and the indicated value at the point when the load is increased is the error of the pressure gauge's pulsation, and its value should not be greater than 1.5 times the absolute value of the allowable basic error. (2) Vibration of the working environment. Apply a load of 50-60% to the pressure gauge. Under the condition that the vibration frequency is 10-60Hz and the amplitude is 0.15mm, the indication error should not be more than twice the allowable basic error.

的测试方法3.1示值检定、压力表的静态示值检定按标有数字的分度线进行示值检定(包括零值)。 Test methods for seismic pressure gauges 3.1 Indication verification, static indication verification of pressure gauges. Indication verification (including zero value) shall be performed according to the numbered graduation lines. During the check, gradually increase the pressure. When the displayed value reaches the upper measurement limit, the pressure resistance is 3 minutes. The pressure gauge at the upper limit of the measurement shall be withstand the pressure for 10 minutes after the spring tube is re-welded or the new pressure of the fork spring is repaired. Press back. At all verification points, the difference between the reading after tapping during step-up and the reading after tapping during the same step-up and step-down should not exceed the absolute value of the allowable basic error. The amount of change in the pointer value (including zero value) caused by tapping the case must not exceed the absolute value of the allowable basic error. When performing the indication check, check the smoothness of the pointer (or dial) movement. The pointer (or dial) should be stable in the full range of indexing, and there should be no jumping or stagnation. 3.2 Verification of seismic resistance (1) Verification of pulsation resistance of working medium. Install the pressure gauge on a pulsating pressure source that can generate a sine wave pulsating pressure with a frequency of 605 times / min. Apply the pulsating pressure at a test point between 30-40% of the range, and its amplitude is not at the pressure value at that point 10% of the pressure gauge, after the pressure gauge's pulsation amplitude is stable, examine the reduction ratio and pulsation error of the pressure gauge. The deviation between the average value of the pulsating pressure received by the pressure gauge and the indicated value at the point when the load is increased is the error of the pressure gauge's pulsation, and its value should not be greater than 1.5 times the absolute value of the allowable basic error. (2) Verification of working environment vibration resistance. Fix the pressure gauge on the vibration table, and apply a soft connection between the standard and the test equipment of the pressure gauge to be tested to prevent the standard from being vibrated. Apply a load of 50-60% of the range to the pressure gauge at a frequency from 10 Under the condition of -60Hz and amplitude of 0.15mm, observe the three directions of x, Y, and z perpendicular to each other, and the displayed value deviates from the maximum value of the verification point (the direction of the pressure pointer axis is the Y direction, which is mainly measured for the hook spring type pressure gauge). Its durability in the x direction can be satisfied in the x direction, and it can also be satisfied in the Y and z directions. The deviation should not be greater than twice the allowable basic error. For the pressure gauge in use, the vibration resistance test of the working environment can be omitted. Vibration resistance The technical requirements of pressure gauges and rigorously tested shock-resistant pressure gauges, when used in industrial production, ensure the safety of production, and also ensure the accuracy and reliability of the transmission of value. Reliable. Because the correct test method is used, the service life of the pressure gauge is extended, safe and high-quality production is guaranteed, and the work efficiency and safety factor are improved.