Pressure gauge testing deviceTechnical Field
The invention relates to the technical field of instrument testing, in particular to a pressure gauge testing device.
Background
The pressure gauge is a meter which takes an elastic element as a sensitive element and measures and indicates the pressure higher than the ambient pressure, and is very common in application and almost extends to all industrial processes and scientific research fields. In order to avoid fatigue damage in the use process, the pressure gauge sample piece needs to be subjected to fatigue test before leaving the factory. In the prior art, when testing the pressure gauge sample, the testing device introduces high-pressure liquid into the test sample, maintains the pressure for a period of time, and monitors whether the test sample can be damaged by fatigue under the continuous high-pressure use condition. The testing device in the prior art can only perform the static pressure test on the pressure gauge sample, and cannot test whether the pressure gauge sample is fatigue damaged or not in the face of the use field Jing Shi with continuously changing pressure, namely, cannot perform dynamic pressure fatigue test, so that the reliability of the product is lower.
Disclosure of Invention
The invention aims to provide a pressure meter testing device, which aims at solving the problem that the reliability of products is low because the testing device in the prior art can only perform static pressure fatigue test on a pressure meter sample and cannot perform dynamic pressure fatigue test.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The pressure gauge testing device comprises an air source and an air cylinder which are connected through an air passage, wherein an electromagnetic valve is arranged on the air passage and used for controlling a piston in the air cylinder to move bidirectionally, the pressure gauge testing device further comprises a first pipeline, a test sample piece and a pressurizing cylinder, a central hole is formed in the pressurizing cylinder, the extending end of a piston rod of the air cylinder is inserted into one end of the pressurizing cylinder in a sliding mode, the other end of the pressurizing cylinder is communicated with one end of the first pipeline, a valve is arranged at the other end of the first pipeline, and the test sample piece is arranged on the side wall of the first pipeline and is communicated with an inner cavity of the first pipeline.
According to the invention, when the fatigue test is carried out, the valve is firstly opened, the liquid medium for pressure transmission is filled into the first pipeline and the pressurizing cylinder, the valve is closed after the liquid medium in the first pipeline reaches a preset pressure, the pressure test of the liquid medium in the first pipeline is carried out at the moment, then the electromagnetic valve controls the piston in the cylinder to move so as to drive the extending end of the piston rod to slide in the pressurizing cylinder, the volume of the inner space of the pressurizing cylinder is changed, thus changing the pressure of the liquid medium, when the static pressure test is carried out, the electromagnetic valve controls the piston to move until the pressure of the liquid medium in the first pipeline reaches the static pressure test pressure, the electromagnetic valve is closed, the piston stops moving, the pressure of the liquid medium is constant, and when the dynamic pressure test is carried out, the electromagnetic valve controls the piston to reciprocate, so that the pressure of the liquid medium in the first pipeline is circularly changed within a set range.
Further, the pressurizing cylinder comprises a cylinder barrel and an end plate arranged at one end of the cylinder barrel, the extending end of the piston rod is inserted into the cylinder barrel in a sliding mode, a through hole is formed in the end plate, one end of the first pipeline is fixed to the end plate and communicated with the through hole, and the inner diameter of the cylinder barrel is larger than that of the first pipeline.
The pressure sensor is used for monitoring the pressure of the liquid medium and transmitting the pressure to the controller, and the controller is used for transmitting instructions to the electromagnetic valve based on pressure data to control the movement of a piston in the cylinder so as to regulate the pressure of the liquid medium.
The electric pump is arranged on the second pipeline, the electric pump is used for pumping liquid medium from the water tank, the liquid medium is injected into the first pipeline after passing through the one-way valve, the electric pump is closed after the liquid medium reaches a preset pressure, and at the moment, the one-way valve is closed, so that the liquid medium cannot flow back.
Further, a second branch pipe communicated with the water tank is arranged on the first pipeline, a pressure release valve is arranged on the second branch pipe, and after the test is finished, the pressure release valve is opened, so that the liquid medium can flow back into the water tank from the second branch pipe.
Furthermore, a pressure reducing valve is arranged on the gas path between the gas source and the electromagnetic valve and is used for adjusting the pressure of the inlet gas, so that the pressure value of the liquid in the first pipeline can meet the static pressure and dynamic pressure test, and meanwhile, the pressure reducing valve can keep the pressure of the inlet gas stable, thereby being beneficial to the stability of the testing device.
Furthermore, a sealing ring is arranged on the inner wall of the booster cylinder, the piston rod penetrates through the sealing ring and forms a seal with the booster cylinder, and water leakage between the piston rod and the booster cylinder is prevented, so that the testing accuracy is affected.
The invention has the beneficial effects that the static pressure fatigue test and the dynamic pressure fatigue test can be carried out on the pressure gauge sample piece, and the reliability of the product is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention.
The drawing shows that the device comprises a 1-cylinder, a 2-piston rod, a 3-sealing ring, a 4-booster cylinder, a 5-test sample piece, a 6-pressure sensor, a 7-pressure release valve, an 8-one-way valve, a 9-electric pump, a 10-water tank, an 11-controller, a 12-electromagnetic valve, a 13-pressure release valve, a 14-first pipeline, a 15-second pipeline, a 16-first air pipe, a 17-second air pipe, a 18-third air pipe, a 19-first branch pipe and a 20-second branch pipe.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a pressure gauge testing device, which is shown in figure 1, and comprises an air source and an air cylinder 1 which are connected through an air path, wherein an electromagnetic valve 12 is arranged on the air path and used for controlling a piston in the air cylinder 1 to move bidirectionally, and further comprises a first pipeline 14, a test sample piece 5 and a hollow pressurizing cylinder 4, wherein the extending end of a piston rod 2 of the air cylinder 1 is inserted into one end of the pressurizing cylinder 4 in a sliding manner, the other end of the pressurizing cylinder 4 is communicated with one end of the first pipeline 14, and a valve is arranged at the other end of the first pipeline 14;
specifically, the air source is an air compressor, the electromagnetic valve 12 is a two-position five-way electromagnetic valve, the air path comprises a first air pipe 16, a second air pipe 17 and a third air pipe 18, the first air pipe 16 is connected between the air source and the electromagnetic valve 12, the second air pipe 17 and the third air pipe 18 are both connected between the electromagnetic valve 12 and the air cylinder 1, one ends of the second air pipe 17 and the third air pipe 18, which are far away from the air cylinder 1, are respectively connected at two ends of the air cylinder 1;
the pressurizing cylinder 4 comprises a cylinder barrel and an end plate arranged at one end of the cylinder barrel, wherein the extending end of the piston rod 2 is inserted into the cylinder barrel in a sliding manner, a through hole is formed in the end plate, and one end of the first pipeline 14 is fixed on the end plate and communicated with the through hole;
the first pipeline 14 is provided with a first branch pipe 19, and the tail end of the first branch pipe 19 is provided with a pressure sensor 6, and the first pipeline further comprises a controller 11, wherein the pressure sensor 6 and the electromagnetic valve 12 are respectively and electrically connected with the controller 11;
The electric water heater also comprises a second pipeline 15, an electric pump 9 and a water tank 10, wherein the valve is a one-way valve 8, the water outlet of the valve is connected with a first pipeline 14, and the water inlet of the valve is connected with the water tank 10 through the second pipeline 15, and the electric pump 9 is arranged on the second pipeline 15;
the first pipeline 14 is provided with a second branch pipe 20 communicated with the water tank 10, and the second branch pipe 20 is provided with a pressure relief valve 7, wherein the pressure relief valve 7 is a manual pressure relief valve;
A pressure reducing valve 13 is arranged on the air path between the air source and the electromagnetic valve 12;
The inner wall of the booster cylinder 4 is provided with a sealing ring 3, and the piston rod 2 passes through the sealing ring 3 and forms a seal with the booster cylinder 4.
The procedure was as follows:
1) Installing the pressure test sample piece 5 to be detected on the first pipeline 14, and manually closing the pressure release valve 7;
2) The controller 11 is operated, the electric pump 9 is started, the water in the water tank 10 is pumped into the first pipeline 14 and the pressurizing cylinder 4, when the pressure sensor 6 detects that the pressure of the water in the first pipeline 14 reaches a set value, the controller 11 turns off the electric pump 9, and at the moment, the one-way valve 8 is in a closed state, and the initial pressure of the first pipeline 14 is stable;
3) The pressure reducing valve 13 is regulated, so that the air flow reduced by the pressure reducing valve 13 pushes the piston to move until the pressure measured by the pressure sensor 6 can reach the pressure value in static pressure test (the static pressure test pressure value is larger than the upper limit value of the dynamic pressure test pressure value, so that the dynamic pressure test can be necessarily satisfied as long as the air pressure reduced by the pressure reducing valve 13 can satisfy the static pressure test), and the pressure reducing valve 13 is not regulated after the regulation is completed;
4) If a static pressure test is carried out, the electromagnetic valve 12 controls the piston to move unidirectionally until the pressure measured by the pressure sensor 6 reaches a static pressure test pressure value, the controller controls the electromagnetic valve 12 to be closed, the piston stops moving, the pressure measured by the test sample 5 is constant, if a dynamic pressure test is carried out, the electromagnetic valve 12 controls the piston to move unidirectionally until the pressure measured by the pressure sensor 6 reaches a dynamic pressure test pressure upper limit value, the controller controls the electromagnetic valve 12 to change the gas flow direction in a gas path, the piston moves reversely until the pressure measured by the pressure sensor 6 reaches a dynamic pressure test pressure lower limit value, the controller controls the electromagnetic valve 12 to change the gas flow direction in the gas path, and the piston moves reversely again, so that the test sample 5 is circulated, and the test sample 5 is subjected to alternating pressure.
5) After the test is completed, the pressure release valve 7 is opened manually, and the water in the first pipe 14 flows back into the water tank 10 from the second branch pipe 20.
Compared with the prior art that the testing device can only perform static pressure fatigue testing on the pressure gauge sample, and cannot perform dynamic pressure fatigue testing, the problem of lower product reliability is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.