CN102042931B - Pressure generator for gas pressure fatigue tester - Google Patents

Abstract

The invention relates to a pressure generator with alternately changed high and low pressure for a gas pressure fatigue tester, belonging to a testing technology. The pressure generator comprises an electric motor, a coupler, a turntable, a pressure chamber, a gas source and a flow valve, wherein the electric motor is connected with the coupler, the coupler is connected with the turntable, and a series of striped grooves are uniformly distributed on the outer circumferential surface of the turntable; the pressure chamber is arranged on a connecting piece, the matched surface of the connecting piece and the turntable is uniformly provided with three exhaust ports, wherein the middle exhaust port is communicated with the pressure chamber, one of the two side exhaust ports is communicated with the atmosphere through the flow valve, and the other side exhaust port is connected with the stable gas source; the grooves on the turntable is long enough to cover two adjacent exhaust ports in the three exhaust ports on the connecting piece, and the distance between the two grooves is larger than the diameter of the exhaust ports; and a gap which is between 0.1m and 0.5 mm is reserved between the turntable and the connecting piece so as to avoid direct contact friction. The high and low pressure values and the frequency of alternately changed pressure fluctuation of the pressure generator can be regulated within a large range, and particularly, the pressure generator has very high durability and reliability.

Description

Gaseous tension fatigue tester pressure generator

Technical field

The invention belongs to experimental technique, relate to a kind of gaseous tension fatigue tester pressure generator of high-low pressure alternate.

Background technology

Along with the raising of society, utilize the demand of hocket the pressure aging test and the fatigue life test of height pressure to get more and more to various press device reliability requirements.Existing pressure fatigue test machine is the mesohigh hydraulic means basically; Require to reach 1,000,000 even 10,000,000 times torture test for the pressure cycling number of times; The long run test time can reach hundreds of individual hour; Reliability and durability that the technical capability of existing equipment can not reach pressure fatigue test technical requirement, particularly testing machine itself have satisfied not the needs of long-time torture test.Also there is not special gaseous tension fatigue tester in addition; People are normal to use simple electromagnetic valve to come pilot-gas pressure alternate between high-low pressure; But the life-span of solenoid valve itself is basically at switch hundreds of thousands time, the life-span will further shorten during switch motion repeatedly continuously.

Summary of the invention

The objective of the invention is to propose a kind of pressure cycling often, gaseous tension fatigue tester pressure generator that reliability is high.

Technical scheme of the present invention is: pressure generator comprises motor, shaft coupling, rotating disk, pressure chamber, source of the gas, flow valve, and motor and shaft coupling join, and shaft coupling is connected with rotating disk, and a series of strip grooves evenly distribute on the outer circumference surface of rotating disk; The pressure chamber is located on the web member, evenly has three exhausr ports on web member and the rotating disk mating surface, and wherein, middle exhausr port is communicated with the pressure chamber, and an exhausr port on both sides is through flow valve and atmosphere, and another exhausr port connects stable source of the gas; The length of rotating disk upper groove covers on the web member two adjacent mouths in three exhausr ports, and the spacing of two grooves is greater than the diameter of exhausr port; Leave the gap of (0.1～0.5) mm between rotating disk and the web member.

A series of scalloped recess that evenly distribute on the outer rim of a transverse plane of said rotating disk, the length of scalloped recess cover on the web member two adjacent mouths in three exhausr ports, and the spacing of two grooves is greater than the diameter of exhausr port; Web member and rotating disk have the end clearance of scalloped recess and install.

Major advantage of the present invention is: the present invention adopts electric rotating machine to drive rotor, utilizes groove on the rotating disk alternately to connect the connection with the pressure chamber of air intake opening, gas outlet, thereby makes the periodic pressure pulsation that produces the high-low pressure alternate in the pressure chamber.The alternating pressure ripple frequency is regulated through changing motor speed, and high-voltage value is regulated through air intake opening pressure, and low voltage value is regulated through changing rate of discharge.Alternating pressure pulsation high-low pressure value and frequency all can be regulated on a large scale.In composition of the present invention, motor generally can continuous working several ten thousand hours, overpressure torture test requirement far away; The physical construction that adopts is fairly simple reliable, and it is little to rub, and air-flow itself also has cooling effect, so the present invention has very high durability and reliability.

Description of drawings

Fig. 1 is a principle of the invention synoptic diagram.

Embodiment

Gaseous tension fatigue tester pressure generator theory structure such as Fig. 1, it is mainly formed and comprises electric rotating machine, shaft coupling 1, support 2, rotor 3, web member 4, flow control 5, pressure chamber 6 etc.

A series of strip grooves that circumferentially evenly distribute on transverse plane of rotor 3 or the curved surface of column, Fig. 1 is the situation of distribution groove on the curved surface of column; Blow vent A, blow vent B, blow vent C are evenly arranged in web member 4 successively with on the one side, and match with groove place rotor 3 top-surface cambers, leave very little gap.Ventilation A mouth connects source of the gas, and blow vent B connects pressure chamber 6, and blow vent C leads to atmosphere through flow control 5.When motor drives rotor 3 uniform rotation through shaft coupling 1, groove will be connected A and B earlier, not have the part of groove to cut off B and C simultaneously, be equipped with in the pressure chamber 6 of testpieces to be full of high pressure; Moving of groove will be connected B and C then, and A and B are cut off simultaneously, and pressure chamber's 6 pressure are released; So back and forth, form periodically height alternating pressure pulsation.The end of shaft coupling 1 passes through roller bearings on support 2.

The high-voltage value of alternating pressure pulsation is regulated through the pressure of regulating pressure-stabilized air source 7 entering air intake opening A.Low voltage value is regulated through the flow control 5 that adjusts gas port C and connected, maximum can near and high-voltage value, I is near atmospheric pressure.The pressure fluctuation frequency is regulated through changing motor speed.

Regulating the concrete operations of the required pressure fluctuation of test explains as follows:

1) regulates the inlet pressure that gets into airway A;

2) according to required pressure fluctuation frequency f (Hz) confirm motor speed υ (rev/min), and the motor constant speed is rotated, f and υ relation are following:

$f=\frac{\mathrm{n\υ}}{60}$

In the formula:

N-supratrochlear depression groove quantity.

3) progressively open flow control 5 from buttoned-up status, reach needed value until the pressure fluctuation low voltage value.

Motor that pressure generator of the present invention is related and physical construction all have very long serviceable life and long-time continuous is used ability, durability and the just right pressure fatigue test that carries out of reliability that it is outstanding.

Claims (2)

1. gaseous tension fatigue tester pressure generator; It is characterized in that; Pressure generator comprises motor, shaft coupling, rotating disk, support, web member, pressure chamber, source of the gas, flow valve; Motor and shaft coupling join, and shaft coupling is connected with rotating disk, and a series of strip grooves evenly distribute on the outer circumference surface of rotating disk; The pressure chamber is located on the web member; Evenly have three blow vents on web member and the rotating disk mating surface; That is: blow vent A, blow vent B, blow vent C, wherein, middle blow vent B is communicated with the pressure chamber; A blow vent C on both sides is through flow valve and atmosphere, and another blow vent A connects pressure-stabilized air source; The length of rotating disk upper groove can cover on the web member adjacent in three blow vents two blow vent B and C, also can cover two blow vent A and B, and the spacing of two grooves is greater than the diameter of blow vent; Leave the gap of 0.1～0.5mm between rotating disk and the web member.

2. gaseous tension fatigue tester pressure generator according to claim 1; It is characterized in that; A series of scalloped recess that evenly distribute on the outer rim of a transverse plane of said rotating disk are to replace said strip groove; The length of scalloped recess can cover on the web member adjacent in three blow vents two blow vent B and C, also can cover two blow vent A and B, and the spacing of two grooves is greater than the diameter of blow vent; Web member and rotating disk have the end clearance of scalloped recess and install.

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