CN204649400U - A kind of high-flow safety valve test device - Google Patents
A kind of high-flow safety valve test device Download PDFInfo
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- CN204649400U CN204649400U CN201520243009.5U CN201520243009U CN204649400U CN 204649400 U CN204649400 U CN 204649400U CN 201520243009 U CN201520243009 U CN 201520243009U CN 204649400 U CN204649400 U CN 204649400U
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 238000004880 explosion Methods 0.000 claims description 141
- 239000007788 liquid Substances 0.000 claims description 74
- 239000007789 gas Substances 0.000 claims description 33
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- 229910000831 Steel Inorganic materials 0.000 claims description 21
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- 238000006073 displacement reaction Methods 0.000 claims description 19
- 238000011049 filling Methods 0.000 claims description 14
- 239000003345 natural gas Substances 0.000 claims description 12
- 238000011001 backwashing Methods 0.000 claims description 8
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- 239000003245 coal Substances 0.000 abstract description 3
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- 239000000839 emulsion Substances 0.000 description 6
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- 238000011010 flushing procedure Methods 0.000 description 2
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Abstract
The utility model belongs to the technical field of the dynamic performance testing of coal mine hydraulic supporting high-flow safety valve, in order to energy is convenient, effectively test the dynamic property of high-flow safety valve, provide a kind of high-flow safety valve test device, comprise the hydraulic cylinder and the cylinder that explodes that are fixed on erecting frame, the cylinder body geo-stationary of hydraulic cylinder and blast cylinder, hydraulic cylinder is connected by same piston rod with the piston of blast cylinder, erecting frame along piston rod stroke direction is provided with energy absorption device, energy absorption device is less than the ultimate range of hydraulic cylinder piston to the cylinder body inner bottom part of hydraulic cylinder to the ultimate range of the piston rod end of hydraulic cylinder side, airtight cavity in described blast cylinder is connected with gas handling system and exhaust system, hydraulic cylinder upper, lower chamber is connected to some fluid path, the joint of the cylinder body of hydraulic cylinder and the cylinder bottom of hydraulic cylinder is provided with the installing port of tested safety valve.It is high that this test unit is opened fast, pressure increases gradient, well can simulate the overall process of opening overflow, specified overflow and closedown.
Description
Technical Field
The utility model belongs to the technical field of the dynamic behavior test of large-traffic relief valve for colliery hydraulic support, concretely relates to large-traffic relief valve test device.
Background
The safety valve is an important protection element of the coal mine hydraulic support and is used for controlling the actual working resistance of the hydraulic support and enabling the actual working resistance not to exceed an allowable value, and the current 1000L/min high-flow safety valve is applied to a high-end hydraulic support in a large area. The dynamic characteristics (dynamic pressure overshoot, opening time, stability and stabilization time) are important properties of the safety valve, and are very important for playing the performance and the function of the hydraulic support in the coupling effect of the hydraulic support and surrounding rocks. The problem that a safety valve simulation test system matched with the current large-flow safety valve is lacked to test various technical indexes and dynamic performance of the safety valve is urgently solved.
The test system of the present safety valve is shown in fig. 5, which uses a high pressure pump 25 as a power source, supplies a liquid with a certain pressure and flow rate, and uses a change valve 26 to realize loading and unloading of the safety valve, and the characteristics of the safety valve 26 are determined by the pressure measured by a pressure sensor 27 and the flow rate measured by a flow rate sensor 30.
However, if the existing test system of the safety valve is used for testing the high-flow safety valve, the test system has certain defects, and the requirements on the flow and the pressure provided by the high-pressure pump are too high, so that special equipment is needed for the high-flow safety valve, a special test system is established, the equipment universality is poor, and the technical difficulty is high.
Disclosure of Invention
The utility model discloses a can convenient, accurate test colliery hydraulic support effectively with the dynamic behavior of large-traffic relief valve, provide a large-traffic relief valve test device.
The utility model adopts the following technical scheme:
the large-flow safety valve test device comprises a hydraulic cylinder and an explosion cylinder which are fixed on a mounting frame, wherein the hydraulic cylinder and a cylinder body of the explosion cylinder are relatively static, the hydraulic cylinder and a piston of the explosion cylinder are connected through a same piston rod, an energy absorption device is arranged on the mounting frame along the stroke direction of the piston rod, the maximum distance from the energy absorption device to the end head of the piston rod on the side of the hydraulic cylinder is smaller than the maximum distance from the piston of the hydraulic cylinder to the bottom in the cylinder body of the hydraulic cylinder, a closed cavity in the explosion cylinder is connected with an air inlet system and an exhaust system, the upper cavity and the lower cavity of the hydraulic cylinder are respectively connected with a plurality of liquid paths, and a mounting opening of a tested.
The hydraulic cylinder comprises a hydraulic cylinder bottom, a hydraulic cylinder body, a hydraulic cylinder cover, a piston rod and a hydraulic cylinder piston, the explosion cylinder comprises an explosion cylinder piston, an explosion cylinder body and an explosion cylinder cover, the piston rod of the hydraulic cylinder comprises a large-diameter section and a small-diameter section, an annular boss is arranged at the joint of the large-diameter section and the small-diameter section, the hydraulic cylinder piston is fixedly installed on the large-diameter section of the piston rod through a locking nut, the hydraulic cylinder piston is in sealing contact with the inner wall of the hydraulic cylinder body to form a sealing strip, and a sealed cavity formed by the hydraulic cylinder bottom, the hydraulic cylinder body and the hydraulic cylinder cover is divided into a; the piston of the explosion cylinder is connected with the end part of the small diameter section of the piston rod extending out of the cylinder cover of the hydraulic cylinder through a pin shaft, the piston of the explosion cylinder is in contact with the inner wall of the cylinder body of the explosion cylinder through a piston ring to form a sealing belt, and a closed cavity formed by the piston of the explosion cylinder, the cylinder body of the explosion cylinder and the cylinder cover of the explosion cylinder is an explosion cavity.
The air inlet system connected with the explosion cavity comprises a compressed air path and a compressed natural air path, the compressed air path comprises an air compressor with an outlet provided with a pressure gauge, a gas flow meter I, a pneumatic stop valve and a one-way valve which are sequentially connected through a pneumatic pipeline, and a seamless steel tube connected with the one-way valve, and the other end of the seamless steel tube is welded on the cylinder cover of the explosion cylinder and is communicated with the explosion cavity; the compressed natural gas circuit comprises a gas storage tank with a pressure gauge at an outlet, a gas flowmeter II, a pneumatic stop valve, a one-way valve and a seamless steel pipe connected with the one-way valve, wherein the gas storage tank, the gas flowmeter II, the pneumatic stop valve and the one-way valve are sequentially connected through a pneumatic pipeline;
the exhaust system connected with the explosion cavity comprises a seamless steel pipe and an electric control pneumatic stop valve, one end of the seamless steel pipe is connected with the electric control pneumatic stop valve, and the other end of the seamless steel pipe is welded on the explosion cylinder cover and communicated with the explosion cavity.
The cylinder cover of the explosion cylinder is also connected with a pneumatic safety valve, a high-energy ignition device and an explosion cavity pressure sensor.
The liquid path connected with the hydraulic cylinder comprises six liquid paths connected with the upper cavity of the hydraulic cylinder, wherein one liquid path is a liquid discharge path which is connected with the liquid return box from the upper cavity of the hydraulic cylinder through the high-pressure hydraulic stop valve; the other five ways are liquid-filled liquid ways which are respectively connected with the upper cavity of the hydraulic cylinder and the power source of the accumulator group through a high-pressure hydraulic stop valve and a one-way valve which are connected in series, the power source of the accumulator group is connected with a backwashing filter through the high-pressure hydraulic stop valve, the backwashing filter is connected with a pump station, and the pump station is connected with a liquid return tank;
the liquid path connected with the hydraulic cylinder also comprises a liquid filling path connected with the lower cavity of the hydraulic cylinder, and the liquid filling path is connected with the liquid return tank through a high-pressure hydraulic stop valve, a backwashing filter and a pump station which are connected in sequence.
And the upper cavity of the hydraulic cylinder is also provided with a pressure sensor I, and one side of the lower cavity of the hydraulic cylinder, which is close to the cylinder bottom of the hydraulic cylinder, is provided with a pressure sensor II.
And a hydraulic cylinder displacement speed sensor for measuring the displacement of the hydraulic cylinder and an eddy current displacement sensor for measuring the displacement of a valve core of the safety valve are also arranged on the mounting frame, and the eddy current displacement sensor is arranged at a safety valve mounting opening of the mounting frame.
The test process of the large-flow safety valve test device is as follows,
a test preparation stage:
a. the high-pressure hydraulic stop valves in five loops between the upper cavity of the hydraulic cylinder and the power source of the accumulator group are all closed, and the power source of the accumulator group is filled with liquid through a hydraulic pump station;
b. the liquid pressure in the power source of the accumulator group reaches the preset initial pressure required by the upper cavity of the hydraulic cylinderClosing a liquid path between the hydraulic pump station and the energy accumulator group power source, and stopping filling liquid for the energy accumulator group power source;
c. opening a high-pressure hydraulic stop valve in a liquid discharge loop connected with a liquid tank, connecting a liquid path between a hydraulic pump station and a hydraulic cylinder lower cavity, filling liquid into the hydraulic cylinder lower cavity, discharging liquid in the hydraulic cylinder upper cavity into the liquid tank, closing the liquid discharge path between the hydraulic cylinder upper cavity and the liquid tank after the hydraulic cylinder lower cavity is filled with high-pressure emulsion, closing the liquid filling path between the hydraulic cylinder lower cavity and the hydraulic pump station, and stopping filling liquid into the hydraulic cylinder lower cavity;
d. opening a high-pressure hydraulic stop valve in five liquid filling liquid paths connecting the upper cavity of the hydraulic cylinder and the power source of the accumulator group to ensure that the power source of the accumulator group charges the upper cavity of the hydraulic cylinder with pressure ofWhile opening the compressed air path to charge the explosion chamber with pressure ofAfter the compressed air is filled, the pneumatic stop valve of the compressed air circuit is closed, and then the compressed natural gas circuit is opened to charge the explosion cavity with pressure ofThe explosion chamber is filled with compressed natural gas at a pressure ofThe mixed gas of (3); at the moment, a combined piston consisting of the hydraulic cylinder piston, the piston rod and the explosion cylinder piston is in an initial balance state under the combined action of the pressures in the hydraulic cylinder upper cavity, the hydraulic cylinder lower cavity and the explosion cavity, and the test preparation stage is completed;
and (3) a test stage: after the test device enters a preparation stage, a high-energy ignition device is started, mixed gas in an explosion cavity explodes, so that shock waves generated by explosion impact on a piston of an explosion cylinder to further push the piston of the explosion cylinder to move downwards, high-pressure emulsion in a lower cavity of a hydraulic cylinder is compressed, the pressure of the emulsion in the lower cavity of the hydraulic cylinder reaches the opening pressure of the tested safety valve, the tested safety valve opens overflow and continuously keeps a rated overflow state, the pressure of the lower cavity of the hydraulic cylinder is monitored through a pressure sensor II to measure a pressure time curve of the tested safety valve, the speed V of the piston rod is measured through a hydraulic cylinder displacement speed sensor, and the rated flow of the tested safety valve is calculated=V*Obtaining a flow time curve of the tested safety valve;
finally, before the piston of the hydraulic cylinder contacts the bottom of the hydraulic cylinder, the end of the large-diameter section of the piston rod touches the energy absorption device to decelerate the piston rod, so that the pressure of the lower cavity of the hydraulic cylinder is reduced to the pressure capable of closing the tested safety valve, the safety valve closes overflow, and the closing pressure of the tested safety valve is monitored by the pressure sensor II at the momentAnd the whole process of the tested safety valve, namely overflow starting, rated overflow and overflow closing, is completed.
The volume ratio of the compressed air and the compressed natural gas filled in the explosion chamber in the step d of the test preparation stage is 9: 1.
The diameter D2 of the large-diameter section and the diameter D1 of the hydraulic cylinder piston rod, the diameter D2 of the hydraulic cylinder and the diameter D1 of the explosion cylinder meet the following requirements:
=+，
wherein,the actual pressure of the upper cavity of the hydraulic cylinder before explosion,of the lower chamber of the cylinder before explosionThe actual pressure is set to be a pressure,is the pre-charge pressure of the explosion chamber.
The utility model discloses following beneficial effect has:
1. because the explosion process time is short, the test device is quick to open, the pressure increase speed of the lower cavity B of the hydraulic cylinder is high, the whole process of the dynamic work of the large-flow safety valve can be well tested, and the test device is particularly suitable for testing the dynamic characteristic of the large-flow safety valve;
2. the device can well simulate the dynamic characteristic of the safety valve when the coal mine underground hydraulic support bears the impact load, and has strong practicability;
3. the utility model adopts the combined loading mode of hydraulic pressure and explosive force to provide good impact loading for the hydraulic cylinder, and has compact structure and high efficiency;
4. the method adopts a hydraulic pressure and explosive force combined loading mode, can obtain proper impact load by using smaller explosive force, when the compressed natural gas accounts for 10 percent of the total volume, the explosive power is the largest, the pressure rise caused by explosion is the highest, the explosion pressure formed in the explosion process is about 8 to 9 times of initial pressure (constant volume explosion pressure), the problem of impact load limitation is solved, and the method is particularly suitable for an ultrahigh pressure hydraulic system with impact loading requirements;
5. the combined piston of the combined loading oil cylinder can be started only when the explosion cavity C is subjected to gas explosion to generate explosion impact load, so that the combined piston can be self-locked without a one-way lock to ensure that the combined piston is in an initial state, and the working stability of the oil cylinder is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a testing apparatus according to the present invention at a preparation stage;
fig. 2 is a schematic structural diagram of the testing device of the present invention when the tested safety valve is rated for overflow;
fig. 3 is a schematic structural diagram of the testing device according to the present invention when the tested safety valve is closed;
FIG. 4 is a schematic structural diagram of a combined loading cylinder composed of a hydraulic cylinder (2) and an explosion cylinder (9);
FIG. 5 is a schematic diagram of a safety valve;
in the figure: 1-an air compressor, 2-a hydraulic cylinder, 3-a tested safety valve, 4-a gas flowmeter I, 5-an eddy current displacement sensor, 6-a pneumatic stop valve, 7-an electric control pneumatic stop valve, 8-a pressure sensor I, 9-an explosion cylinder, 10-a pneumatic safety valve, 11-a high-energy igniter, 12-an explosion cavity pressure sensor, 13-a mounting rack, 14-a pressure sensor II, 15-a high-pressure hydraulic stop valve, 16-an accumulator group power source (10 100L accumulators), 17-a pump station, 18-a gas storage tank, 19-a gas flowmeter II, 20-a hydraulic cylinder displacement speed sensor, 21-an energy absorption device, 22-a liquid tank, 23-a seamless steel pipe and 24-a backwashing filter;
25-a high-pressure pump station, 26-a reversing valve, 27-a pressure stabilizing tank, 28-a pressure sensor, 29-a safety valve and 30-a flow sensor;
201-hydraulic cylinder bottom, 202-hydraulic cylinder body, 203-hydraulic cylinder cover, 204-piston rod, 205-hydraulic cylinder piston, 206-lock nut;
901-explosion cylinder piston, 902-explosion cylinder body, 903-explosion cylinder cover;
d1-the diameter of the small-diameter section, D2-the diameter of the large-diameter section, D1-the diameter of the explosion cylinder and D2-the diameter of the hydraulic cylinder;
the device comprises an A-hydraulic cylinder upper cavity, a B-hydraulic cylinder lower cavity, a C-explosion cavity, a K-compressed air path, a P-exhaust system and a T-compressed natural air path.
Detailed Description
The embodiments of the invention will be further explained with reference to the accompanying drawings:
the large-flow safety valve test device shown in fig. 1 comprises a hydraulic cylinder 2 and an explosion cylinder 9 which are fixed on a mounting frame 13, wherein cylinder bodies of the hydraulic cylinder 2 and the explosion cylinder 9 are relatively static, pistons of the hydraulic cylinder 2 and the explosion cylinder 9 are connected through the same piston rod, an energy absorption device 21 is arranged on the mounting frame 13 along the stroke direction of the piston rod, the maximum distance from the energy absorption device 21 to the end head of the piston rod on the side of the hydraulic cylinder is smaller than the maximum distance from the piston of the hydraulic cylinder 2 to the bottom of the cylinder body of the hydraulic cylinder 2, a closed cavity in the explosion cylinder 9 is connected with an air inlet system and an exhaust system P, the upper cavity and the lower cavity of the hydraulic cylinder 2 are respectively connected with a plurality of liquid paths, and a mounting opening of.
As shown in fig. 4, the hydraulic cylinder 2 includes a hydraulic cylinder bottom 201, a hydraulic cylinder body 202, a hydraulic cylinder cover 203, a piston rod 204 and a hydraulic cylinder piston 205, the explosion cylinder 9 includes an explosion cylinder piston 901, an explosion cylinder body 902 and an explosion cylinder cover 903, the piston rod 204 of the hydraulic cylinder includes a large diameter section and a small diameter section, an annular boss is arranged at the joint of the large diameter section and the small diameter section, the hydraulic cylinder piston 205 is mounted and fixed on the large diameter section of the piston rod 204 through a lock nut 206, and the hydraulic cylinder piston 205 is in sealing contact with the inner wall of the hydraulic cylinder body 202 to form a sealed cavity, and the sealed cavity formed by the hydraulic cylinder bottom 201, the hydraulic cylinder body 202 and the hydraulic cylinder cover 203 is divided into a hydraulic cylinder upper sealed; the explosion cylinder piston 901 is connected with the end part of the small diameter section of the piston rod 204 extending out of the hydraulic cylinder cover 203 through a pin shaft, the explosion cylinder piston 901 is in contact with the inner wall of the explosion cylinder body 902 through a piston ring to form a sealing band, and the closed cavity formed by the explosion cylinder piston 901, the explosion cylinder body 902 and the explosion cylinder cover 903 is an explosion cavity C.
The hydraulic cylinder part is a double-rod hydraulic cylinder, the outer diameter of the piston rod is a step diameter, and the diameters of the two ends of the lug boss are d1 (respectively: (a)The diameter of the small-diameter section), D2 (the diameter of the large-diameter section), and the diameter D1 of the explosion cylinder and the diameter D2 of the hydraulic cylinder satisfy the following conditions:=+whereinthe actual pressure of the upper chamber a of the hydraulic cylinder before explosion,the actual pressure of the lower chamber B of the hydraulic cylinder before explosion,is the pre-charge pressure of the explosion chamber C. When the combined piston composed of the hydraulic cylinder piston rod 204, the hydraulic cylinder piston 205 and the explosion cylinder piston 901 is in an initial state, the combined piston is in a state shown in fig. 1 under the combined action of high pressure in the hydraulic cylinder upper chamber a, high pressure in the hydraulic cylinder lower chamber B and unexploded gas in the explosion chamber C, and cannot move freely, and the combined piston can be started only when the gas in the explosion chamber C explodes to generate explosion impact load. Therefore, when the oil cylinder is in the initial state, no matter how the oil cylinder is placed, the combined loading oil cylinder formed by the hydraulic cylinder and the explosion cylinder can not act by itself, and the oil cylinder does not need to be locked by a one-way lock, so that the combined piston is always in the initial state.
When the gas in the explosion cavity C explodes, the shock wave generated by explosion impacts on the piston of the explosion cylinder, and the combined piston is pushed to move downwards under the action of the explosion force and the hydraulic pressure in the upper cavity A of the hydraulic cylinder.
As shown in fig. 1, the air intake system connected to the explosion chamber C includes a compressed air path K and a compressed natural air path T, the compressed air path K includes an air compressor 1 with an outlet provided with a pressure gauge, a gas flow meter I4, a pneumatic stop valve 6, a check valve, and a seamless steel tube 23 connected to the check valve, which are sequentially connected through a pneumatic pipeline, and the other end of the seamless steel tube 23 is welded to the explosion cylinder cover 903 and is communicated with the explosion chamber C; the compressed natural gas path T comprises a gas storage tank 18 with an outlet provided with a pressure gauge, a gas flow meter II19, a pneumatic stop valve 6, a one-way valve and a seamless steel tube 23 connected with the one-way valve, wherein the gas storage tank 18, the gas flow meter II19, the pneumatic stop valve 6 and the one-way valve are sequentially connected through a pneumatic pipeline, and the other end of the seamless steel tube 23 is welded on a cylinder cover 903 of the explosion cylinder and communicated with; the exhaust system P connected with the explosion chamber C comprises a seamless steel pipe 23 and an electric control pneumatic stop valve 7, one end of the seamless steel pipe 23 is connected with the electric control pneumatic stop valve 7, and the other end of the seamless steel pipe 23 is welded on the explosion cylinder cover 903 and is communicated with the explosion chamber C.
The upper hydraulic cylinder cavity A is connected with six liquid paths, and one path is a liquid discharge path which is connected with the liquid return box 23 from the upper hydraulic cylinder cavity A through the high-pressure hydraulic stop valve 15; the other five paths are liquid-filled paths which are respectively connected with the upper cavity A of the hydraulic cylinder and the power source 16 of the accumulator group through a high-pressure hydraulic stop valve 15 and a one-way valve which are connected in series, the power source 16 of the accumulator group is connected with a back-flushing filter 24 through the high-pressure hydraulic stop valve, the back-flushing filter 24 is connected with a pump station 17, and the pump station 17 is connected with a liquid return tank 22. Meanwhile, the upper cavity A of the hydraulic cylinder is also provided with a pressure sensor I8 for monitoring the pressure in the upper cavity A of the hydraulic cylinder in real time.
The lower cavity B of the hydraulic cylinder is connected with a liquid filling path which is connected with a liquid return tank 22 through a high-pressure hydraulic stop valve, a backwashing filter 24 and a pump station 17 which are connected in sequence. Meanwhile, the pressure sensor II14 arranged near the side of the cylinder bottom 202 of the hydraulic cylinder is used for monitoring the pressure change in the overflow process of the safety valve to be tested in real time.
After the tested safety valve 3 is arranged in the mounting port at the position of the lower cavity B of the hydraulic cylinder close to the bottom of the hydraulic cylinder, the corresponding preset pressure values of the upper cavity A and the explosion cavity C of the hydraulic cylinder are determined according to the pressure values=31.5Mpa、=2Mpa, utilize the utility model discloses the dynamic behavior of this relief valve of test device test (pressure time curve, flow time curve and relief valve case displacement time curve including the relief valve), its concrete test procedure as follows:
a test preparation stage: the high-pressure hydraulic stop valves 15 in five parallel loops between the upper cavity A of the hydraulic cylinder and the energy accumulator group power source 16 are all closed, and the energy accumulator group power source 16 is filled with liquid through a hydraulic pump station 17;
when the pressure of the liquid in the accumulator group power source 16 reaches 31.5Mpa, closing a liquid path between the hydraulic pump station 17 and the accumulator group power source 16, and stopping filling the liquid into the accumulator group power source 16;
opening the high-pressure hydraulic stop valve in the liquid discharge loop connected with the liquid tank 22, connecting the liquid paths of the hydraulic pump station 17 and the hydraulic cylinder lower cavity B, filling the hydraulic cylinder lower cavity B, discharging the liquid in the hydraulic cylinder upper cavity A into the liquid tank 22, and when the hydraulic cylinder lower cavity B is full of liquid and the liquid tank B is full of liquidAfter 31.5Mpa high-pressure emulsion with the same pressure, closing a liquid discharge liquid path between the upper cavity A of the hydraulic cylinder and the liquid tank 22, closing a liquid path between the lower cavity B of the hydraulic cylinder and the hydraulic pump station 17, and stopping filling liquid into the lower cavity B of the hydraulic cylinder;
opening the high-pressure hydraulic stop valve 15 in the five liquid-charging paths connecting the upper chamber a of the hydraulic cylinder and the accumulator group power source 16, so that the accumulator group power source 16 charges 31.5Mpa of high-pressure liquid for the upper chamber a of the hydraulic cylinder, and simultaneously opening the compressed air path K to charge 9/10V of 2Mpa compressed air for the explosion chamber C (wherein V = V)Volume of the explosion chamber C), after the compressed air is filled, the pneumatic stop valve 6 of the compressed air path K is closed, and then the compressed natural gas path T is opened to fill the 2Mpa compressed natural gas (wherein V is the volume of the explosion chamber C) with the volume of 1/10 × V into the explosion chamber C=The volume of the explosion cavity C) to ensure that the explosion cavity C is filled with mixed gas with the pressure of 2MPa, wherein the natural gas accounts for about 10 percent of the volume ratio of the mixed gas, the explosive force generated by the proportioning is maximum, the pressure in the explosion cavity can be increased to the maximum, the optimal proportioning of the mixed gas is realized, and the volume ratio of the compressed air to the compressed natural gas can be adjusted according to the requirement in the actual operation.
According to a predetermined pressure before the test=31.5Mpa、The large diameter section diameter D2, the small diameter section diameter D1, the explosion cylinder diameter D1 and the hydraulic cylinder diameter D2 of the hydraulic cylinder piston rod are reasonably configured in the following way by =2 Mpa:
=+the combined piston composed of the hydraulic cylinder piston rod 204, the hydraulic cylinder piston 205 and the explosion cylinder piston 901 is enabled to be high-pressure liquid of 31.5Mpa (namely, the actual pressure Pa =31.5 Mpa) in the hydraulic cylinder upper chamber a (in the experiment preparation stage, since the hydraulic cylinder upper chamber a is small relative to the liquid volume of the accumulator group, the accumulator group power source is set to continuously provide the high-pressure liquid of 31.5Mpa for the hydraulic cylinder upper chamber a in the experiment preparation stage, and at this time, the actual pressure Pa and the preset pressure Pa in the embodiment are set to be high in the experiment preparation stageEqual) and 2Mpa (i.e. in the explosion chamber C)The mixed gas of which is not less than 2Mpa moves downwards under the combined action of the mixed gas, the lower cavity B of the hydraulic cylinder is compressed, and the pressure of the lower cavity B of the hydraulic cylinder is increased to 40Mpa (namely the actual pressure value of the lower cavity of the hydraulic cylinder before the explosion of the explosion cylinder is equal to=40 Mpa), since the bulk modulus of the high-pressure liquid is large, the amount of movement of the combination piston is small, only a few millimeters, and it is considered that the combination piston hardly moves. The combined piston of the cylinder piston 205, the piston rod 204 and the explosion cylinder piston 901 is in the initial equilibrium state as shown in fig. 1 under the pressure in the cylinder upper chamber a, the cylinder lower chamber B and the explosion chamber C, and the test preparation phase is completed.
And (3) a test stage: after the test device enters a preparation state, the high-energy ignition device 11 is started, the mixed explosive gas in the cavity C of the explosion cavity explodes, so that shock waves generated by explosion impact on the piston 901 of the explosion cylinder to further push the piston 901 of the explosion cylinder to move downwards, and as the piston 901 of the explosion cylinder and the piston 205 of the hydraulic cylinder are connected through the pin shaft to form a combined piston, under the action of the explosive force and the hydraulic pressure generated by the upper cavity a of the hydraulic cylinder, high-pressure emulsion in the lower cavity B of the hydraulic cylinder is compressed, so that the emulsion pressure in the lower cavity B of the hydraulic cylinder reaches the opening pressure of the safety valve 3 to be tested, the safety valve 3 to be tested opens to overflow, under the combined action of the expansion action of the explosive gas generated by explosion and the hydraulic pressure generated by the upper cavity a of the hydraulic cylinder, the combined piston moves downwards, and. In the test process, the pressure of the lower cavity B of the hydraulic cylinder is monitored through the pressure sensor II14 to measure the pressure time curve of the tested safety valve 3, meanwhile, the speed V of the piston rod 204 is measured through the hydraulic cylinder displacement speed sensor 20, and the flow of the tested safety valve 3 is calculated，=V*And further obtaining a flow time curve of the tested safety valve 3.
Finally, when the hydraulic cylinder piston 205 quickly hits the hydraulic cylinder bottom 201 (as shown in fig. 3, when the end of the large diameter section of the hydraulic cylinder piston is 50mm away from the hydraulic cylinder bottom), the end of the large diameter section of the piston rod in the hydraulic cylinder lower cavity B first hits the energy absorber 21, the piston rod 204 decelerates, so that the pressure of the hydraulic cylinder lower cavity B is reduced to the pressure capable of closing the safety valve, the safety valve closes the overflow, and the closing pressure of the tested safety valve 3 is monitored by the pressure sensor II14 at this timeTherefore, the whole process of overflow starting, rated overflow and overflow closing of the tested safety valve is completed. Wherein, the energy absorption device 21 is a rubber block with the similar action principle as a spring, and plays the roles of speed reduction and pressure relief.
In the test process, the pressure of the upper cavity A of the hydraulic cylinder can be monitored in real time through the pressure sensor I8 arranged on the upper cavity A of the hydraulic cylinder, and the pressure change of the tested safety valve in the overflow process can be monitored in real time through the pressure sensor II14 arranged on the side, close to the cylinder bottom, of the lower cavity B of the hydraulic cylinder. The explosion chamber pressure sensor 12 mounted on the cylinder cover 903 of the explosion cylinder is used for monitoring the pressure of the mixed gas in the explosion chamber C and monitoring the pressure change of the explosion chamber C in real time, and then the explosion cylinder is prevented from being over-pressurized by the pneumatic safety valve 10, and the high-energy ignition device 11 is used for igniting the mixed gas in the explosion chamber C.
The hydraulic cylinder displacement speed sensor 20 arranged on the mounting frame 13 is used for measuring the speed V of the hydraulic cylinder piston in the test process to indirectly measure the flow of the tested safety valve（=V*) The eddy current displacement sensor 5 mounted on the mounting frame 13 is used for monitoring a displacement-time curve (S-t) of the safety valve core in the test process in real time.
When the hydraulic cylinder and the explosion cylinder are selected and designed, the maximum stroke of the piston of the hydraulic cylinder is smaller than that of the piston of the explosion cylinder, and the piston of the hydraulic cylinder is ensured to be firstly contacted with the bottom of the hydraulic cylinder when the combined piston moves downwards.
In the whole test process, the dynamic characteristic of the safety valve is converted into the flow of the safety valve by the pressure tested by the pressure sensor II and the piston cylinder speed tested by the hydraulic cylinder displacement speed sensor（=V*) And determining the displacement time relation of the safety valve core.
The large-flow safety valve test device in the embodiment has the advantages of quick opening and high pressure increase gradient, can well simulate the whole process of opening overflow, rated overflow and closing of the large-flow safety valve, and can well reflect the dynamic characteristics of the whole process of the large-flow safety valve.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Wherein, the parts or the structure which are not specially explained in the utility model are the prior art.
Claims (7)
1. A large-traffic relief valve test device which characterized in that: the explosion-proof safety valve comprises a hydraulic cylinder (2) and an explosion cylinder (9) which are fixed on a mounting frame (13), wherein the cylinder bodies of the hydraulic cylinder (2) and the explosion cylinder (9) are relatively static, pistons of the hydraulic cylinder (2) and the explosion cylinder (9) are connected through the same piston rod, an energy absorption device (21) is arranged on the mounting frame (13) along the stroke direction of the piston rod, the maximum distance from the energy absorption device (21) to the end of the piston rod on the side of the hydraulic cylinder is smaller than the maximum distance from the piston of the hydraulic cylinder (2) to the bottom of the cylinder body of the hydraulic cylinder (2), a closed cavity in the explosion cylinder (9) is connected with an air inlet system and an air exhaust system (P), the upper cavity and the lower cavity of the hydraulic cylinder (2) are respectively connected with a plurality of liquid paths, and the connecting.
2. The mass flow safety valve testing apparatus of claim 1, characterized in that: the hydraulic cylinder (2) comprises a hydraulic cylinder bottom (201), a hydraulic cylinder body (202), a hydraulic cylinder cover (203), a piston rod (204) and a hydraulic cylinder piston (205), the explosion cylinder (9) comprises an explosion cylinder piston (901), an explosion cylinder body (902) and an explosion cylinder cover (903), the piston rod (204) of the hydraulic cylinder comprises a large-diameter section and a small-diameter section, an annular boss is arranged at the joint of the large-diameter section and the small-diameter section, the hydraulic cylinder piston (205) is fixedly arranged on the large-diameter section of the piston rod (204) through a locking nut (206), the hydraulic cylinder piston (205) is in sealing contact with the inner wall of the hydraulic cylinder body (202) to form a sealing strip, and a sealed cavity formed by the hydraulic cylinder bottom (201), the hydraulic cylinder body (202) and the hydraulic cylinder cover (203) is divided into a hydraulic cylinder upper cavity (A) and a hydraulic; the explosion cylinder piston (901) is connected with the end part of the small diameter section of the piston rod (204) extending out of the hydraulic cylinder cover (203) through a pin shaft, the explosion cylinder piston (901) is in contact with the inner wall of the explosion cylinder body (902) through a piston ring to form a sealing band, and the closed cavity formed by the explosion cylinder piston (901), the explosion cylinder body (902) and the explosion cylinder cover (903) is an explosion cavity (C).
3. The mass flow safety valve testing apparatus of claim 2, characterized in that: the air inlet system connected with the explosion cavity (C) comprises a compressed air path (K) and a compressed natural gas path (T), the compressed air path (K) comprises an air compressor (1) with a pressure gauge at an outlet, a gas flow meter I (4), a pneumatic stop valve (6), a one-way valve and a seamless steel tube (23) connected with the one-way valve, which are sequentially connected through a pneumatic pipeline, and the other end of the seamless steel tube (23) is welded on the cylinder cover (903) of the explosion cylinder and is communicated with the explosion cavity (C); the compressed natural gas circuit (T) comprises a gas storage tank (18) with an outlet provided with a pressure gauge, a gas flowmeter II (19), a pneumatic stop valve (6), a one-way valve and a seamless steel pipe (23) connected with the one-way valve, wherein the gas storage tank, the gas flowmeter II, the pneumatic stop valve and the one-way valve are sequentially connected through a pneumatic pipeline, and the other end of the seamless steel pipe (23) is welded on a cylinder cover (903) of the explosion cylinder and is communicated with an explosion cavity (C);
the exhaust system (P) connected with the explosion cavity (C) comprises a seamless steel pipe (23) and an electric control pneumatic stop valve (7), one end of the seamless steel pipe (23) is connected with the electric control pneumatic stop valve (7), and the other end of the seamless steel pipe (23) is welded on the explosion cylinder cover (903) and is communicated with the explosion cavity (C).
4. The mass flow safety valve testing apparatus of claim 3, characterized in that: the explosion cylinder cover (903) is also connected with a pneumatic safety valve (10), a high-energy ignition device (11) and an explosion cavity pressure sensor (12).
5. The mass flow safety valve testing apparatus of claim 4, wherein: the liquid path connected with the hydraulic cylinder (2) comprises six liquid paths connected with the upper cavity (A) of the hydraulic cylinder, and one liquid path is a liquid drainage liquid path which is connected with the upper cavity (A) of the hydraulic cylinder to the liquid return tank (23) through the high-pressure hydraulic stop valve (15); the other five ways are liquid filling ways which are respectively connected with the upper cavity (A) of the hydraulic cylinder and a power source (16) of the energy accumulator group through a high-pressure hydraulic stop valve (15) and a one-way valve which are connected in series, the power source (16) of the energy accumulator group is connected with a backwashing filter (24) through the high-pressure hydraulic stop valve, the backwashing filter (24) is connected with a pump station (17), and the pump station (17) is connected with a liquid return tank (22);
the liquid path connected with the hydraulic cylinder (2) also comprises a liquid filling path connected with the lower cavity (B) of the hydraulic cylinder, and the liquid filling path is connected with a liquid return tank (22) through a high-pressure hydraulic stop valve, a backwashing filter (24) and a pump station (17) which are connected in sequence.
6. The mass flow safety valve testing apparatus of claim 5, characterized in that: and the hydraulic cylinder upper cavity (A) is also provided with a pressure sensor I (8), and one side of the hydraulic cylinder lower cavity (B) close to the hydraulic cylinder bottom (202) is provided with a pressure sensor II (14).
7. The mass flow safety valve testing apparatus of claim 6, characterized in that: and a hydraulic cylinder displacement speed sensor (20) for measuring the displacement of the hydraulic cylinder and an eddy current displacement sensor (5) for measuring the displacement of a valve core of the safety valve are further installed on the installation frame (13), and the eddy current displacement sensor (5) is installed at the safety valve installation opening of the installation frame (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520243009.5U CN204649400U (en) | 2015-04-21 | 2015-04-21 | A kind of high-flow safety valve test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520243009.5U CN204649400U (en) | 2015-04-21 | 2015-04-21 | A kind of high-flow safety valve test device |
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| Publication Number | Publication Date |
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| CN204649400U true CN204649400U (en) | 2015-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520243009.5U Withdrawn - After Issue CN204649400U (en) | 2015-04-21 | 2015-04-21 | A kind of high-flow safety valve test device |
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| CN (1) | CN204649400U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865056A (en) * | 2015-04-21 | 2015-08-26 | 太原理工大学 | Large-flow safety valve testing device |
| CN111649901A (en) * | 2020-08-10 | 2020-09-11 | 苏州东菱振动试验仪器有限公司 | Pneumatic type strikes platform |
| CN112098123A (en) * | 2020-08-28 | 2020-12-18 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
-
2015
- 2015-04-21 CN CN201520243009.5U patent/CN204649400U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865056A (en) * | 2015-04-21 | 2015-08-26 | 太原理工大学 | Large-flow safety valve testing device |
| CN104865056B (en) * | 2015-04-21 | 2017-09-12 | 太原理工大学 | A kind of high-flow safety valve test device |
| CN111649901A (en) * | 2020-08-10 | 2020-09-11 | 苏州东菱振动试验仪器有限公司 | Pneumatic type strikes platform |
| CN111649901B (en) * | 2020-08-10 | 2021-02-09 | 苏州东菱振动试验仪器有限公司 | Pneumatic type strikes platform |
| CN112098123A (en) * | 2020-08-28 | 2020-12-18 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
| CN112098123B (en) * | 2020-08-28 | 2021-11-09 | 清华大学 | Hydraulic cylinder performance measuring method of driving mechanism |
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