CN113820136A - Pressure balance test device and method for gas injection type accumulator - Google Patents
Pressure balance test device and method for gas injection type accumulator Download PDFInfo
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- CN113820136A CN113820136A CN202110986317.7A CN202110986317A CN113820136A CN 113820136 A CN113820136 A CN 113820136A CN 202110986317 A CN202110986317 A CN 202110986317A CN 113820136 A CN113820136 A CN 113820136A
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
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- 239000007788 liquid Substances 0.000 claims abstract description 135
- 230000005284 excitation Effects 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims abstract description 9
- 238000010998 test method Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 85
- 238000007789 sealing Methods 0.000 claims description 68
- 238000002156 mixing Methods 0.000 claims description 51
- 238000005266 casting Methods 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 13
- 239000000725 suspension Substances 0.000 claims description 11
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
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- 239000004519 grease Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
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- 239000000956 alloy Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The invention provides a pressure balance test device and a test method of a gas injection type pressure accumulator, wherein the test device comprises a buffer, a filling and discharging assembly, an excitation device, an energy accumulator, a gas supply assembly, a measurement control system, a pressure balance assembly, a limiting device and a supporting and hanging assembly; the air supply assembly provides pressure for the air cavity and the energy storage device and also provides pressure for pressurizing the liquid cavity; the excitation equipment provides power for the vertical movement of the piston; the measurement control system measures pressure liquid level information of the acquisition system and controls the pressure of a part of systems through a valve and a switch; the limiting device limits the thin wall surface of the gas injection type pressure accumulator to generate convex deformation due to pressure. The invention can realize the pressure balance of the large-sized gas injection type pressure accumulator under the frequency of 5-2000 Hz, effectively check the working performance of the gas injection type pressure accumulator with different delivery apertures under the given gas inlet flow, and simultaneously can obtain the loss amount of liquid in the gas injection type pressure accumulator and the fluctuation condition of the liquid level in the gas injection type pressure accumulator in the pressure balance process.
Description
Technical Field
The invention relates to the field of test systems, in particular to a pressure balance test device and a test method for a gas injection type accumulator.
Background
The coupling of the rocket propulsion system and the structural system during rocket operation can cause overall unstable self-excited vibration which is very harmful, and the installation of the pressure accumulator becomes an important means for effectively inhibiting the vibration. Compared with the traditional pressure accumulator membrane box, the gas injection type pressure accumulator with simple processing technology, high structural efficiency, adaptation to installation space and strong frequency conversion capability is gradually replacing the pressure accumulator pressure membrane box and being applied to a new generation of heavy carrier rockets. The pressure cycle test method of the pressure diaphragm capsule of the existing small-sized accumulator is not suitable for a new generation of gas injection type accumulator. The new generation of gas injection type pressure accumulator has the characteristics of large volume, large working pressure and the like, so that a new ground test method capable of reliably verifying the working characteristics of the pressure accumulator is urgently needed to be developed and applied to the pressure balance test of the novel gas injection type pressure accumulator.
Disclosure of Invention
The invention aims to provide a pressure balance test device and a test method for a gas injection type accumulator, which can be suitable for the gas injection type accumulator with large volume and large working pressure, realize pressure balance work under the frequency of 5-2000 Hz, and truly simulate the working characteristics of the gas injection type accumulator.
In order to achieve the technical effects, the technical scheme of the invention is as follows: the pressure balance test device for the gas injection type pressure accumulator comprises a buffer 1, a filling and discharging assembly, an excitation device 7, an energy accumulator 14, a gas supply assembly, a measurement control system 17, a pressure balance assembly, a limiting device and a supporting and hanging assembly;
the pressure balancing assembly comprises a pressure accumulator body 5, a delivery pipe 11, a gas-liquid mixing cylinder 10, an excitation equipment protection structure 30, a double-layer sealing piston 8 and an energy accumulator 14; the upper end face of the gas-liquid mixing cylinder 10 is hermetically connected with the pressure accumulator body 5 through a flange, the gas cavity 31 is separated from the liquid cavity 29 through the double-layer sealing piston 8, the gas cavity 31 is filled with compressible gas and communicated with the energy accumulator 14 to balance the pressure of the gas cavity 31, and the purpose of pressure balance of the gas cavity 31 is to balance the pressure of the liquid cavity 29 and reduce the load of the excitation equipment 7;
wherein, the rod cavity of the gas-liquid mixing cylinder 10 is an air cavity 31 and is filled with compressible gas, and the rodless cavity of the gas-liquid mixing cylinder is a liquid cavity 29 and is connected with the bottom of the gas injection type accumulator body 5 through a flange and is filled with liquid; a piston rod of the double-layer sealing piston 8 is connected with an excitation device 7; the energy accumulator is communicated with the air cavity 31 of the gas-liquid cylinder by using a medium as gas, and plays a role in balancing the air pressure of the air cavity 31; the filling and discharging assembly fills liquid into the liquid cavity 29 through the lower end of the gas injection type pressure accumulator body 5 and can receive discharged liquid at the same time;
the gas supply assembly provides pressure to the gas chamber 31 and also to the liquid chamber 29; the excitation device 7 provides power for the vertical movement of the double-layer sealing piston 8; the measurement control system 17 measures the pressure liquid level information of the acquisition system and controls the pressure of a part of systems through valve switches; the buffer 1 provides buffer for pressure release and liquid discharge of the gas injection type pressure accumulator; the supporting suspension device provides support for the pressure balance assembly, and the long head of the conveying pipe 11 is in a free boundary state, so that the clamping caused by excitation is avoided; the limiting device limits the bulge deformation of the thin wall surface of the accumulator body 5 caused by pressure.
Further, an excitation protection structure 30 is arranged between the air cavity 31 and the liquid cavity 29 of the gas-liquid mixing cylinder 10, and the excitation protection structure 30 limits the displacement of the double-layer sealing piston 8 to protect excitation equipment from being damaged due to the out-of-control piston; one end of the double-layer sealing piston 8 is positioned in the liquid cavity 29, the other end of the double-layer sealing piston is positioned in the air cavity 31, two layers of sealing rings are arranged on the upper surface and the lower surface of the double-layer sealing piston 8 respectively, the gas and the liquid are not mixed due to multi-layer sealing, and lubricating grease is added on the upper surface of the double-layer sealing piston 8 positioned in the liquid cavity 29 to reduce the motion friction force of the piston; the excitation equipment 7 is connected with a piston rod at the lower end of the double-layer sealing piston 8 through a bolt, and excitation under various frequencies is provided for a test system.
Further, the pressure balance between the pressure accumulator body 5 and the delivery pipe 11 is generated by the volume change of the liquid in the liquid cavity 29 pushed by the double-layer sealing piston 8; the excitation device 7 can realize excitation under various frequencies, but the excitation amplitude is limited, and the defect that the excitation amplitude of the excitation device 7 is limited is overcome by designing the inner diameter of the gas-liquid mixing cylinder 10, so that the required volume change of the liquid in the required liquid cavity 29 is achieved;
the lower part of the accumulator body 5 is a liquid cavity 32, the upper part of the gas injection type accumulator body 5 is a gas cavity 34, the gas injection type accumulator body 5 is communicated with the delivery pipe 11 through a certain number of holes 33 in the middle of the delivery pipe 11, and liquid with pressure flows through the holes 33, so that the accumulator body 5 and the delivery pipe 11 generate pressure change.
Further, the supporting suspension assembly consists of a first casting block 4, a base 12, a second casting block 13, a third casting block 18, a fourth casting block 19, a tool 9 and a rubber rope set 20; the first casting block 4 and the base 12 are used for building bottom supports on two sides of the excitation equipment 7, the second casting block 13 is transversely arranged on the bottom supports, and the tool 9 is transversely arranged on the second casting block 13; the third casting block 18 and the fourth casting block 19 are supported at the top on the bottom support, the gas-liquid mixing cylinder 10 is erected on the tool 9, the conveying pipe 11 is suspended to the top support fourth casting block 19 through a rubber rope group 20 through a flange 21, the dead weight of the gas injection type pressure accumulator body 5, the conveying pipe 11 and the gas-liquid mixing cylinder 10 in the pressure balance assembly is balanced, and meanwhile the top of the conveying pipe 11 is guaranteed to be a free boundary.
Further, the measurement control system comprises a measurement control system 17, a liquid level sensor 27, an exhaust and liquid drainage electromagnetic valve, a high-pressure electromagnetic valve, a first inflation switch K1, a first deflation switch K2, a second inflation switch K3, a second deflation switch K4, a leakage switch K5, a filling switch K6, a first pressure sensor 24, a second pressure sensor 25, a third pressure sensor 26 and a fourth pressure sensor 28; the measurement control system collects signals of the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor and the liquid level sensor and records the signals, and then controls each valve and each switch to control the pressure and the liquid level of the system.
Further, the gas supply assembly comprises a gas distribution table 15 and a nitrogen gas cylinder group 16, the nitrogen gas cylinder group 16 sends high-pressure gas into the gas distribution table 15, and balance pressure is provided for the pressure balance assembly by adjusting the gas distribution table 15 and balance pressure is provided for the energy storage device and the gas cavity 15;
the limiting device comprises a support 22 and a switching block 6, the switching block 6 is installed on a block 13 supporting the suspension assembly through bolt connection, the support 22 is pressed on the thin wall surface of the pressure accumulator body 5 and connected with the switching block 6 through bolts, and protruding deformation of the thin wall surface of the pressure accumulator body 5 due to pressure is effectively limited.
Further, the volume ratio of the air cavity 31 to the liquid cavity 29 of the gas-liquid mixing cylinder 10 is as follows: 5-6: 1, wherein the volume ratio of the air cavity 31 of the gas-liquid mixing cylinder 10 to the energy accumulator 14 is as follows: 1: 1-1.5;
the volume ratio of the accumulator body 5 to the delivery pipe 11 and the volume ratio of the accumulator body to the gas-liquid mixing cylinder 10 is at least 2: 1.
Another embodiment of the present invention provides a testing method using the above testing apparatus for pressure balance of a gas-injection accumulator, comprising the following steps:
s1, building bottom supports on two sides of the excitation equipment 7, and arranging a tool 9 transversely on the bottom supports;
s2, connecting the lower end of the pressure accumulator body 5 with the upper end of the gas-liquid mixing cylinder 10, hoisting the pressure accumulator body 5, the delivery pipe 11, the gas-liquid mixing cylinder 10 and the double-layer sealing piston 8 through the top flange 21, installing the double-layer sealing piston 8 on the excitation equipment 7, and installing the gas-liquid mixing cylinder 10 on the tool 9;
s3, building a top support of the support suspension assembly, suspending the conveying pipe 11 to the top support fourth ingot 19 through a top flange 21 by using a rubber rope group 20, and communicating the energy storage device 14 with the air cavity 31 of the gas-liquid mixing cylinder 10;
s4, filling liquid into the bottom of the delivery pipe 11 of the pressure accumulator, and then sealing the closed cavity structure;
s5, the delivery pipe 11 is communicated with the accumulator body 5, the delivery pipe 11 is inflated and gradually pressurized through the gas distribution table, the pressure of the pressure sensor 25 and the pressure sensor 26 are controlled and observed, and the pressure sensor 28 at the bottom of the delivery pipe 11 reaches the designated pressure; in the process, the gas distribution table synchronously pressurizes the energy storage device 14 and the gas cavity 31 of the gas-liquid mixing cylinder 10, so that the pressure of the gas cavity 31 of the gas-liquid mixing cylinder 10 and the pressure of the liquid cavity 29 are synchronous, and the double-layer sealing piston 8 is positioned in the design middle position. Meanwhile, the pressure of the buffer 1 is filled to the pressure of the storage tank during actual work;
s6, opening a high-pressure solenoid valve M1 and an exhaust and liquid discharge solenoid valve M2, starting the excitation device 7 to push liquid in a liquid cavity 29 through a double-layer sealing piston 8 to start a test, adjusting the pressure of a delivery pipe 11 through a first inflation switch K1 and a first deflation switch K2 in the test, and adjusting the pressure of a buffer 1 through a second inflation switch K3 and a second deflation switch K4; the measurement control system collects pressure and liquid level signals and controls the valve and the switch.
Further, in the step S5, when the double-layer sealing piston 8 is located in the designed middle position, the piston rod of the double-layer sealing piston 8 is connected to the excitation device (7), and when the excitation device (7) is opened and does not work, the double-layer sealing piston 8 is located at the middle position of the actuating cavity in the gas-liquid mixing cylinder 10, the positive stroke displacement of the double-layer sealing piston is equal to the positive maximum amplitude of the excitation device (7), and the negative stroke displacement of the double-layer sealing piston is equal to the negative maximum amplitude of the excitation device (7).
Further, the synchronous pressurization in step S6 means that the maximum pressure does not exceed the working pressure of the gas injection accumulator while increasing at a pressure of 0.1MPa per step.
The pressure balance test device and the test method for the gas injection type accumulator provided by the invention have the beneficial effects that:
1) the invention carries out the overall optimization design of the pressure balance test system of the gas injection type accumulator, particularly carries out the innovation design of the pressure balance assembly, adopts the mode of air pressure balance, can carry out the pressure balance test of the large-volume gas injection type accumulator, and simultaneously makes up the problem of insufficient load capacity of the excitation equipment.
2) The invention skillfully designs the gas-liquid mixing cylinder, and calculates and designs the diameter of the actuating cavity of the gas-liquid mixing cylinder according to the liquid flow required by the pressure balance of the gas injection type pressure accumulator and the maximum load capacity of the excitation equipment under a specific frequency.
3) The piston rod with double-layer sealing is ingeniously designed, in order to ensure the strength of the piston rod and reduce the load on the excitation equipment, the head of the piston rod is directly processed into a flange connected with the excitation equipment, the structure is simplified, and the piston rod is made of aluminum alloy materials to reduce the weight.
4) The invention reasonably designs the volume proportional relation between the air cavity and the liquid cavity and the volume proportional relation between the energy accumulator and the cavity thereof, and tests the pressure balance of the air cavity under the excitation condition of the excitation equipment.
5) The upper surface and the lower surface of the double-layer sealing piston are respectively provided with the two layers of sealing rings, the gas and the liquid are not mixed due to the multi-layer sealing, lubricating grease is added to the upper surface of the double-layer sealing piston positioned in the liquid cavity, the use of lubricating oil compatible with the liquid in the liquid cavity is avoided, and the moving friction force of the piston is reduced.
6) The upper surface and the lower surface of the double-layer sealing piston are respectively provided with the two layers of sealing rings, the gas and the liquid are not mixed by the multi-layer sealing, and the lubricating grease is added on the upper surface of the double-layer sealing piston positioned in the liquid cavity, so that the moving friction force of the piston is reduced.
7) The invention designs the limiting device, and effectively limits the convex deformation of the thin wall surface of the accumulator body caused by pressure.
8) The invention designs a supporting suspension assembly which is used for bearing other components such as a gas injection type pressure accumulator, a gas-liquid mixing cylinder and the like, and lightening the load of excitation equipment, so that the load of the excitation equipment only has a double-layer sealing piston and liquid in a system. And meanwhile, the supporting and hanging assembly ensures that one end of the conveying pipe is positioned on a free boundary, so that the phenomenon that the double-layer sealing piston is blocked when the fixed boundary causes the movement is avoided.
Drawings
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a schematic view of a pressure balance testing system for a gas injection accumulator according to the present invention;
FIG. 2 is a schematic view of the pressure balance assembly of the present invention, wherein the pressure accumulator body, the delivery pipe, the gas-liquid mixing cylinder, and the double-layer sealing piston are shown in cross section.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
Example 1
As shown in fig. 1, the pressure balance test system of the gas injection type accumulator of the present invention is shown, and it can be seen that the pressure balance test method of the gas injection type accumulator of the present invention includes a buffer 1, a filling and discharging assembly, an excitation device 7, an energy storage device 14, a gas supply assembly, a measurement control system, a pressure balance assembly, a limiting device and a support suspension assembly, wherein the pressure balance assembly includes an accumulator body 5, a delivery pipe 11, a gas-liquid mixing cylinder 10, an excitation device protection structure 30, a double-layer sealing piston 8 and an energy storage device 14.
The supporting and hanging assembly consists of an ingot 4, a base 12, an ingot 13, an ingot 18, an ingot 19, a tool 9 and a rubber rope set 20.
The measurement control system comprises a measurement control system 17, a liquid level sensor 27, an exhaust and liquid discharge electromagnetic valve M2, a high-pressure electromagnetic valve M1, an inflation switch K1, an deflation switch K2, an inflation switch K3, a deflation switch K4, a discharge switch K5, a filling switch K6, a pressure sensor 24, a pressure sensor 25, a pressure sensor 26 and a pressure sensor 28.
The limiting device comprises a bracket 22 and a switching block 6.
The gas supply assembly comprises a gas distribution table 15 and a nitrogen gas cylinder group 16.
Wherein, a piston rod of the double-layer sealing piston 8 is arranged on the excitation device 7 through a screw, a piston head is arranged in a actuating cavity of the gas-liquid mixing cylinder 10 and can vertically move along the actuating cavity, the gas-liquid mixing cylinder 10, the pressure accumulator body 5 and the delivery pipe 11 form a sealing cavity, and the cavity is filled with liquid to form a liquid cavity. The rod chamber of the gas-liquid mixing cylinder 10 is communicated with the energy accumulator 14 to form an air chamber.
The delivery pipe 11 of the pressure accumulator body 5 is assembled and installed on the upper part of the gas-liquid mixing cylinder 10 through a screw, and a sealing structure is formed through a sealing ring.
1) Two sides of the excitation equipment 7 are respectively provided with a bottom support, and a tool 9 is transversely arranged on the bottom support;
2) the lower end of the pressure accumulator body 5 is connected with the upper end of the gas-liquid mixing cylinder 10, the pressure accumulator body 5, the delivery pipe 11, the gas-liquid mixing cylinder 10 and the double-layer sealing piston 8 are hoisted through the top flange 21, the double-layer sealing piston 8 is installed on the excitation equipment 7, and the gas-liquid mixing cylinder 10 is installed on the tool 9;
3) a top support of the support suspension assembly is built, and the conveyor pipe 11 is suspended to a top support ingot 19 by a set of bungee cords 20 through a top flange 21. The accumulator 14 is communicated with the air chamber 31 of the gas-liquid mixing cylinder 10.
4) And filling liquid into the bottom of the delivery pipe 11 of the pressure accumulator, and then sealing the closed cavity structure.
5) The delivery pipe 11 is communicated with the accumulator body 5, the delivery pipe 11 is inflated and gradually pressurized through the gas distribution table, and the pressure of the pressure sensor 25 and the pressure sensor 26 are controlled and observed to enable the pressure sensor 28 at the bottom of the delivery pipe 11 to reach the specified pressure. In the process, the gas distribution table synchronously pressurizes the energy storage device 14 and the gas cavity 31 of the gas-liquid mixing cylinder 10, so that the pressure of the gas cavity 31 of the gas-liquid mixing cylinder 10 and the pressure of the liquid cavity 29 are synchronous, and the double-layer sealing piston 8 is positioned in the design middle position. At the same time, the pressure of the buffer 1 is filled to the pressure of the storage tank during actual operation
6) Opening the high-pressure electromagnetic valve M1 and the exhaust and liquid discharge electromagnetic valve M2, starting the test that the exciting device 7 pushes the liquid in the liquid cavity 29 through the double-layer sealing piston 8, adjusting the pressure of the delivery pipe 11 through the inflation switch K1 and the deflation switch K2 in the test, and adjusting the pressure of the buffer 1 through the inflation switch K3 and the deflation switch K4 until the pressure value of the pressure sensor 28 at the bottom of the delivery pipe reaches the balance.
Those not described in detail in this specification are within the skill of the art. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A pressure balance test device of a gas injection type pressure accumulator is characterized by comprising a buffer (1), a filling and discharging assembly, an excitation device (7), an energy accumulator (14), a gas supply assembly, a measurement control system (17), a pressure balance assembly, a limiting device and a support suspension assembly;
the pressure balance assembly comprises a pressure accumulator body (5), a delivery pipe (11), a gas-liquid mixing cylinder (10), an excitation equipment protection structure (30), a double-layer sealing piston (8) and an energy accumulator (14); the upper end face of the gas-liquid mixing cylinder (10) is hermetically connected with the pressure accumulator body (5) through a flange, an air cavity (31) is separated from a liquid cavity (29) through a double-layer sealing piston (8), the air cavity (31) is filled with compressible gas and communicated with an energy accumulator (14), the pressure of the air cavity (31) is balanced, and the purpose of pressure balance of the air cavity (31) is to balance the pressure of the liquid cavity (29) and reduce the load of an excitation device (7);
wherein, a rod cavity of the gas-liquid mixing cylinder (10) is an air cavity (31) and is filled with compressible gas, and a rodless cavity of the gas-liquid mixing cylinder is a liquid cavity (29) and is connected with the bottom of the gas injection type accumulator body (5) through a flange and is filled with liquid; a piston rod of the double-layer sealing piston (8) is connected with an excitation device (7); the energy accumulator is communicated with an air cavity (31) of the gas-liquid cylinder by using a medium as gas, and plays a role in balancing the air pressure of the air cavity (31); the filling and discharging assembly fills liquid into a liquid cavity (29) through the lower end of the gas injection type pressure accumulator body (5) and can receive discharged liquid at the same time;
the gas supply assembly provides pressure for the gas cavity (31) and also provides pressure for pressurizing the liquid cavity (29); the excitation equipment (7) provides power for the vertical movement of the double-layer sealing piston (8); the measurement control system (17) measures the pressure liquid level information of the acquisition system and controls the pressure of a part of systems through a valve switch; the buffer (1) provides buffer for pressure release and liquid discharge of the gas injection type pressure accumulator; the supporting and hanging device provides support for the pressure balance assembly, and the long head of the conveying pipe (11) is in a free boundary state, so that the clamping caused by excitation is avoided; the limiting device limits the bulge deformation of the thin wall surface of the accumulator body (5) due to pressure.
2. The gas injection type accumulator pressure balance test device of claim 1, wherein an excitation protection structure (30) is arranged between the gas cavity (31) and the liquid cavity (29) of the gas-liquid mixing cylinder (10), and the excitation protection structure (30) limits the displacement of the double-layer sealing piston (8) to protect the excitation equipment from being damaged due to piston runaway; one end of the double-layer sealing piston (8) is positioned in the liquid cavity (29), the other end of the double-layer sealing piston is positioned in the air cavity (31), two layers of sealing rings are arranged on the upper surface and the lower surface of the double-layer sealing piston (8), the gas and the liquid are not mixed due to multi-layer sealing, lubricating grease is added on the upper surface of the double-layer sealing piston (8) positioned in the liquid cavity (29), and the moving friction force of the piston is reduced; the excitation equipment (7) is connected with a piston rod at the lower end of the double-layer sealing piston (8) through a bolt, and excitation under various frequencies is provided for a test system.
3. The gas-injection accumulator pressure balance test device of claim 1, wherein the pressure balance between the accumulator body (5) and the delivery pipe (11) is generated by the volume change of the liquid in the liquid cavity (29) pushed by the double-layer sealing piston (8); the excitation device (7) can realize excitation under various frequencies, but the excitation amplitude is limited, and the defect that the excitation amplitude of the excitation device (7) is limited is compensated by designing the inner diameter of the gas-liquid mixing cylinder (10), so that the required volume change of liquid in the required liquid cavity (29) is achieved;
the lower part of the pressure accumulator body (5) is a liquid cavity (32), the upper part of the gas injection type pressure accumulator body (5) is a gas cavity (34), the gas injection type pressure accumulator body (5) is communicated with the delivery pipe (11) through holes (33) with specific number in the middle of the delivery pipe (11), and liquid with pressure flows through the holes (33), so that the pressure accumulator body (5) and the delivery pipe (11) generate pressure change.
4. The gas-injection accumulator pressure balance test apparatus of claim 1, wherein the support suspension assembly is composed of a first casting block (4), a base (12), a second casting block (13), a third casting block (18), a fourth casting block (19), a tooling (9), and a rubber rope set (20); the first casting block (4) and the base (12) are used for building bottom supports on two sides of the excitation equipment (7), the second casting block (13) is transversely arranged on the bottom supports, and the tool (9) is transversely arranged on the second casting block (13); the top support is built on the bottom support by the third ingot (18) and the fourth ingot (19), the gas-liquid mixing cylinder (10) is erected on the tool (9), the conveying pipe (11) is suspended to the top support fourth ingot (19) through a rubber rope set (20) for a flange (21), the dead weight of the gas injection type pressure accumulator body (5), the conveying pipe (11) and the gas-liquid mixing cylinder (10) in the balanced pressure balance assembly is guaranteed, and the top of the conveying pipe (11) is a free boundary.
5. The gas-injection accumulator pressure balance test apparatus of claim 1, wherein the measurement control system comprises a measurement control system (17), a level sensor (27), an exhaust drain solenoid valve, a high-pressure solenoid valve, a first charge switch (K1), a first bleed switch (K2), a second charge switch (K3), a second bleed switch (K4), a bleed switch (K5), a charge switch (K6), a first pressure sensor (24), a second pressure sensor (25), a third pressure sensor (26), a fourth pressure sensor (28); the measurement control system collects signals of the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor and the liquid level sensor and records the signals, and then controls each valve and each switch to control the pressure and the liquid level of the system.
6. The gas-injection accumulator pressure balance test apparatus of claim 1, wherein the gas supply assembly comprises a gas distribution table (15) and a nitrogen gas cylinder set (16), the nitrogen gas cylinder set (16) supplies high-pressure gas into the gas distribution table (15), and the gas distribution table (15) is adjusted to provide a balance pressure for the pressure balance assembly and a balance pressure for the accumulator and the gas chamber (15);
the limiting device comprises a support (22) and a switching block (6), the switching block (6) is installed on a block (13) supporting the suspension assembly through bolt connection, the support (22) is pressed on a thin wall surface of the pressure accumulator body (5) and connected with the switching block (6) through bolts, and protruding deformation of the thin wall surface of the pressure accumulator body (5) due to pressure is effectively limited.
7. The gas-injection accumulator pressure balance test apparatus of claim 1, wherein the gas-liquid mixing cylinder (10) has a volume ratio of the gas chamber (31) to the liquid chamber (29) of: 5-6: 1, wherein the volume ratio of an air cavity (31) of the gas-liquid mixing cylinder (10) to the energy accumulator (14) is as follows: 1: 1-1.5;
the volume ratio of the accumulator body (5) to the delivery pipe (11) and the volume ratio of the accumulator body to the gas-liquid mixing cylinder (10) is at least 2: 1.
8. A test method using the gas-injection accumulator pressure balance test apparatus of any one of claims 1 to 7, comprising the steps of:
s1, building bottom supports on two sides of the excitation equipment (7), and arranging a tool (9) cross frame on the bottom supports;
s2, the lower end of the pressure accumulator body (5) is connected with the upper end of a gas-liquid mixing cylinder (10), the pressure accumulator body (5), a delivery pipe (11), the gas-liquid mixing cylinder (10) and a double-layer sealing piston (8) are hoisted through a top flange (21), the double-layer sealing piston (8) is installed on excitation equipment (7), and the gas-liquid mixing cylinder (10) is installed on a tool (9);
s3, building a top support of the support suspension assembly, suspending the conveying pipe (11) to a top support casting block (19) through a top flange (21) by using a rubber rope set (20), and communicating an energy storage device (14) with an air cavity (31) of the gas-liquid mixing cylinder (10);
s4, filling liquid to the bottom of a delivery pipe (11) of the pressure accumulator, and then sealing the closed cavity structure;
s5, the delivery pipe (11) is communicated with the pressure accumulator body (5), the delivery pipe (11) is inflated and gradually pressurized through the gas distribution table, the pressure of the pressure sensor (25) and the pressure sensor (26) is controlled and observed, and the pressure sensor (28) at the bottom of the delivery pipe (11) reaches the designated pressure; in the process, the gas distribution table synchronously pressurizes the energy storage device (14) and the gas cavity (31) of the gas-liquid mixing cylinder (10), so that the pressure of the gas cavity (31) of the gas-liquid mixing cylinder (10) is synchronous with that of the liquid cavity (29), and the double-layer sealing piston (8) is positioned in a designed middle position. Meanwhile, the pressure of the buffer (1) is filled to the pressure of the storage tank during actual work;
s6, opening a high-pressure solenoid valve (M1) and an exhaust and liquid drainage solenoid valve (M2), starting an excitation device (7) to push liquid in a liquid cavity (29) through a double-layer sealing piston (8) to start a test, wherein in the test, the pressure of a delivery pipe (11) is adjusted through an inflation switch (K1) and an deflation switch (K2), and the pressure of a buffer (1) is adjusted through an inflation switch (K3) and an deflation switch (K4); the measurement control system collects pressure and liquid level signals and controls the valve and the switch.
9. The testing method of the gas-injection accumulator pressure balance testing apparatus of claim 8, characterized in that: and in the step S5, the double-layer sealing piston (8) is positioned in a designed middle position, namely, the piston rod of the double-layer sealing piston (8) is connected with the excitation equipment (7), when the excitation equipment (7) is started and does not work, the double-layer sealing piston (8) is positioned in the middle position of an actuating cavity in the gas-liquid mixing cylinder (10), the positive stroke displacement of the double-layer sealing piston is equal to the positive maximum amplitude of the excitation equipment (7), and the negative stroke displacement of the double-layer sealing piston is equal to the negative maximum amplitude of the excitation equipment (7).
10. The testing method of the gas-injection accumulator pressure balance testing apparatus of claim 9, characterized in that: the synchronous pressurization in said step S6 means that the maximum pressure does not exceed the working pressure of the gas injection accumulator while increasing at a pressure of 0.1MPa per step.
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