CN114518189A - Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa - Google Patents
Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa Download PDFInfo
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- CN114518189A CN114518189A CN202111663021.8A CN202111663021A CN114518189A CN 114518189 A CN114518189 A CN 114518189A CN 202111663021 A CN202111663021 A CN 202111663021A CN 114518189 A CN114518189 A CN 114518189A
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims description 15
- 210000004907 gland Anatomy 0.000 claims 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 12
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/16—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of pistons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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Abstract
The invention discloses an ultrahigh pressure piston type pressure gauge with the measuring range of 1400MPa, which comprises a high pressure generator, a pressure reducer and a pressure reducer, wherein the high pressure generator is connected with a multiplier, one end of the pressure reducer is connected with a high pressure piston system, the other end of the pressure reducer and the multiplier are respectively connected with an instrument to be detected through an ultrahigh pressure pipeline, the pressure reducer is connected with a precompression pump through a stop valve, and the precompression pump is connected with the multiplier through two stop valves connected in parallel; the pressure gauge can realize the measurement of the pressure with the ultra-high range of 1400 MPa.
Description
Technical Field
The invention belongs to the technical field of pressure gauges, and particularly relates to an ultrahigh pressure piston type pressure gauge with the measuring range of 1400 MPa.
Background
The action principle of the piston type pressure gauge is that the hydrostatic balance principle and the Pascal principle are utilized, and the method specifically comprises the following steps: the pressure measurement is carried out by the principle that the fluid pressure acting on the effective area of the piston and the gravity of the loaded special weight are balanced mutually;
the ultra-high pressure gauge is urgently needed to be developed: ultrahigh pressure measurement technology is required in phase state and phase change, temperature, magnetic field, electrical property and the like of ultrahigh pressure research substances, most of novel high-strength materials and artificial diamond are also formed by ultrahigh pressure treatment, and the ultrahigh pressure measurement technology is required to support in aspects of military affairs, aerospace, chemical engineering, medical treatment and the like; the pressure range of the existing piston pressure gauge in the domestic market is generally less than 250MPa, the piston pressure gauge with the highest pressure range is 800MPa, and the existing 1400MPa ultrahigh pressure piston pressure gauge in the market does not exist.
Disclosure of Invention
The invention aims to provide an ultrahigh pressure piston type pressure gauge with the range of 1400MPa, and solves the problem that the ultrahigh pressure gauge is small in range.
The technical scheme adopted by the invention is that the ultrahigh pressure piston type pressure gauge with the measuring range of 1400MPa comprises a high pressure generator and a pressure reducer, wherein the high pressure generator is connected with a multiplier, one end of the pressure reducer is connected with a high pressure piston system, the other end of the pressure reducer and the multiplier are respectively connected with an instrument to be detected through ultrahigh pressure pipelines, the pressure reducer is connected with a precompression pump through a stop valve, and the precompression pump is connected with the multiplier through two stop valves connected in parallel.
The invention is also characterized in that:
the multiplier comprises an upper shell and a lower shell which are connected with each other, wherein a groove is formed in the upper shell, an ultrahigh pressure piston cylinder is embedded in the groove, an ultrahigh pressure stop block is embedded in the groove opening through a threaded structure and is connected with the ultrahigh pressure piston cylinder for fixing the ultrahigh pressure piston cylinder, and an ultrahigh pressure piston rod is embedded in the ultrahigh pressure piston cylinder; the precompression pump is connected with the output end of the ultrahigh pressure piston cylinder through a stop valve A;
a groove A is formed in the lower shell, a high-pressure piston cylinder is embedded in the groove A, a high-pressure stop block is embedded in the groove opening through a thread structure, the high-pressure stop block is connected with the high-pressure piston cylinder and used for fixing the high-pressure piston cylinder, a high-pressure piston rod is embedded in the high-pressure piston cylinder, and the high-pressure piston cylinder is connected with a pressure reducer; the output end of the high-pressure piston cylinder is connected with a pressure reducer, a stop valve B is connected between the pressure reducer and the high-pressure piston cylinder, and the stop valve B is connected with a precompression pump;
the piston cylinder is characterized by also comprising a piston cylinder, wherein two ends of the piston cylinder are respectively embedded into the upper shell and the lower shell, and the ultrahigh pressure piston rod and the high pressure piston cylinder are opposite and are both positioned in the piston cylinder;
a sealing ring A is arranged between the high-pressure piston cylinder and the lower shell;
the end part of the ultrahigh pressure piston rod is provided with a convex structure, one end of the high pressure piston rod, which is opposite to the ultrahigh pressure piston rod, is provided with a groove matched with the convex structure, the upper shell and the lower shell are connected through screws, and the piston cylinder is positioned inside the joint of the upper shell and the lower shell;
the high-pressure piston system comprises a piston cylinder, a piston cylinder is arranged in the piston cylinder, a piston rod is embedded in the piston cylinder, one end, far away from the piston cylinder, of the piston rod is connected with a piston rod pressing cap, the piston rod pressing cap is connected with a hanging basket, the bottom of the piston cylinder is provided with an air inlet, the air inlet is communicated with the piston cylinder, and the air inlet is connected with the output end of a pressure reducer;
the joint of the piston cylinder and the piston cylinder is also provided with a groove compression nut;
wherein hang the basket and cup joint in the outside of piston cylinder, and hang the basket and be located piston cylinder outside cylinder body department and still be provided with the weight frame.
The invention has the beneficial effects that:
the ultra-high pressure piston type pressure gauge with the measuring range of 1400MPa can realize the measurement of the pressure with the ultra-high pressure measuring range of 1400 MPa.
Drawings
FIG. 1 is a schematic diagram of the design of an ultra-high pressure piston manometer with a range of 1400MPa according to the present invention;
FIG. 2 is a schematic diagram of the multiplier of the ultra-high pressure piston manometer with range of 1400MPa according to the present invention;
FIG. 3 is a schematic view showing the structure of a pressure reducer of the ultra-high pressure piston type pressure gauge of the present invention having a measurement range of 1400 MPa;
FIG. 4 is a schematic diagram of the structure of the ultra-high pressure interface of the ultra-high pressure piston manometer with the range of 1400 MPa;
FIG. 5 is a schematic diagram showing the structure of a high-pressure piston system in the ultra-high pressure piston manometer with a range of 1400MPa according to the present invention.
In the figure, 1, an upper shell; 2. a seal ring; 3. an ultrahigh pressure piston cylinder; 4. an ultrahigh pressure stop block; 5. a piston cylinder; 6. an ultrahigh pressure piston rod; 7. a high pressure stop block; 8. a high pressure piston rod; 9. a high pressure piston cylinder; 10. a lower housing; 11. a piston cylinder; 12. hanging a basket; 13. a tray; 14. a piston rod pressing cap; 15. a piston rod; 16. a piston cylinder; 17. the groove compresses the nut; 18. and (4) weighing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Firstly, loading corresponding weights 18 on a piston system, then opening 3 stop valves as shown in figure 1, wherein the stop valves are equivalent to a switch function, after the stop valves are opened, prepressing the whole system by a prepressing pump to ensure that the liquid pressure in the system is about 60MP, then closing 3 stop valves, and completing prepressing; rotating the weight with two hands at a rotation speed of about (30-60) r/min, starting the high-pressure generator to pressurize, so that the piston rises to a balance position, and the whole system is in a balance state, namely the pressure value to be measured can be measured.
The high pressure generator makes the liquid pressure in the pipeline reach 160MPa to 250 MPa's high pressure, high-pressure liquid passes through the pipeline and conveys the multiplier, the multiplier makes the pressure of high-pressure liquid improve to 1400 MPa's superhigh pressure, assume that the multiple of improving is K, the super high-pressure liquid that comes out from the multiplier is connected to the instrument that detects with the pipeline, the super high-pressure liquid that comes out from the instrument that detects is connected to the pressure reducer again, this pressure reducer is a pressure relief device, the multiple of decompression still is K, super high-pressure liquid is through the pressure reducer decompression to high pressure state (160MPa to 250MPa), then connect this high-pressure liquid to piston system (the high-pressure piston part in figure 1), when piston system is balanced, can measure the pressure of the instrument that detects.
The calculation method comprises the following steps: and (3) calculating the pressure of the piston system to be P according to the weight added to the piston system, and then setting the pressure value P' of the detected instrument to be KP.
The ultrahigh pressure piston type pressure gauge with the measuring range of 1400MPa comprises an ultrahigh pressure generator system, a pressure reducing system, a sealing system and a piston system.
The ultrahigh pressure generation system comprises: a pressure multiplier is adopted to carry out a pressurization technology; the problem that the existing pressure is difficult to pressurize when reaching 160MPa or more than 250MPa is solved, when the pressure is 160MPa, the output pressure at the other end can be 1200MPa or 1400MPa by applying the technology, and the application of the multiplication technology ensures that the pressure of a pressure generator can reach 1400 MPa.
The high pressure generating system consists of a high pressure generator and a multiplier, as shown in figure 2, a stop valve is opened, a precompression pump is started to enable the pressure of the pressure gauge system to reach about 60MPa, the stop valve is closed, the high pressure generator is started to enable the liquid pressure at the inlet of the multiplier to reach 160MPa to 250MPa, and the liquid pressure at the outlet of the multiplier reaches 1400MPa after the multiplication of the multiplier;
the multiplier structure is as shown in figure 2, firstly, the superhigh pressure piston cylinder 3 is installed in the upper shell 1, the middle is sealed by the sealing ring 2, similarly, the high pressure piston cylinder 9 is installed in the lower shell 10, the middle is sealed by the sealing ring, then the superhigh pressure baffle 4 and the high pressure baffle 7 are respectively installed, the superhigh pressure baffle 4 and the high pressure baffle 7 are installed on the upper shell 1 and the lower shell 10 through screw threads, the superhigh pressure baffle 4 and the high pressure baffle 7 play the role of fixing the superhigh pressure piston cylinder 3 and the high pressure piston cylinder 9, and also play the role of limiting the superhigh pressure piston rod 6 and the high pressure piston rod 9, then the piston cylinder 5 is installed on the upper shell 1, then the superhigh pressure piston rod 6 and the high pressure piston rod 8 are matched together through a boss and a groove and are installed in the piston cylinder, finally, as shown in figure 2, the assembled upper shell part and the lower shell part are assembled through screw connection, the multiplier is installed;
assuming that the effective area of the high-pressure piston rod is K times of that of the ultrahigh-pressure piston rod, the liquid pressure at the inlet of the voltage multiplier is P, and according to a calculation formula: the force is expressed as pressure area, and when the system is balanced, the pressure of the fluid at the outlet of the voltage doubler is about K times P.
A pressure reduction system: a pressure reducer is added into the piston system for pressure reduction technology; solves the problems that when the existing pressure reaches 1400MPa or more than 1400MPa, the area of the piston rod is too small and the piston rod is difficult to process, the grinding technical requirement is extremely high and the piston rod is broken by carelessness and the like. The piston system has too many weights, which increases the workload, when the pressure is 1400MPa, the output pressure at the other end can be changed to 160MPa to 250MPa, and the application of the double reduction technology ensures that the piston system is broken because the area of the piston rod is extremely small when the pressure value is too high;
the pressure reduction system mainly comprises a pressure reducer, the pressure reducer is essentially a pressure reducer, the principle of the pressure reducer is similar to that of a multiplier, and the maximum difference is that the pressure reducer is turned at an inlet and outlet position (as shown in figure 3): that is, the end with the smaller effective area of the piston rod is the inlet end of the liquid, as shown in fig. 1, the liquid pressure can reach the ultra-high pressure of 1400MPa, the end with the larger effective area of the piston rod is the outlet end, and the liquid pressure at the outlet end reaches the phase high pressure state: 160MPa to 250 MPa; when the effective area of the high-pressure piston rod is K times of that of the ultrahigh-pressure piston rod, the liquid pressure of the high-pressure end of the outlet is 1/K times of that of the ultrahigh-pressure end, and ultrahigh-pressure conversion to high pressure is completed.
The working principle of the pressure reducing system is as follows: after the system pre-compaction is finished, the stop valve is closed, as shown in fig. 3, the interface of the stop valve is at the high-pressure end of the pressure reducer, which is another difference of the multiplier (two positions in total, the upper section of the first position is described), after the high-pressure generator (fig. 1) works, the liquid pressure is amplified by the multiplier, the ultrahigh pressure liquid is connected to the measured pressure, after passing through the pressure reducer, the liquid pressure is reduced, the ultrahigh pressure is changed into high pressure, the high pressure liquid is connected with the piston system, after the piston system is coded to be balanced, the whole system is in a balanced state, the pressure of the measured ultrahigh pressure part can be calculated according to the value of the weight, and thus the measurement is finished;
sealing system
The tightness index is a key index of pressure measurement and is inversely proportional to the magnitude of pressure; when the pressure is higher, the pipeline is more easy to have the problem of tightness, and leakage accidents such as oil leakage and air leakage occur. In the pressure technology research at home and abroad, the sealing performance research is taken as a breakthrough point. In the invention, whether the sealing performance meets the requirement when the ultrahigh pressure occurs is one of the technical indexes for effectively guaranteeing the pressure measurement reading and reflecting the overall stability of the ultrahigh pressure piston type pressure gauge;
in the invention, the main points of the ultrahigh pressure sealing are as follows: the first point is that the piston rod and the piston cylinder of the ultrahigh pressure part of the multiplier and the pressure reducer are sealed, the piston rod and the piston cylinder are directly sealed, namely, the mature grinding technology is applied, and the matching gap between the piston rod and the piston cylinder can reach 0.001 mm; the second point is the problem of sealing the connection port of the ultrahigh-pressure device under test.
The structural design of the connector of the detected instrument is a key technology for whether the detected instrument can be normally detected. In the invention, the output pressure of the pressure interface is absolute ultrahigh pressure of 1400MPa, a multi-stage throttling and partial pressure sealing structure is adopted, the sealing part adopts conical surface sealing, the interface between the conical surface and the gauge seat is subjected to second linear sealing, and G1 conical thread connection ensures that the pressure can be normally used in the ultrahigh pressure state of 1400MPa, and the structure is shown in figure 4.
A piston assembly system:
the piston system adopts a pressure reducer device to carry out pressure reduction technology, and solves the problems that when the existing pressure reaches 1400MPa or more than 1400MPa, the area of a piston rod is too small, the processing is difficult, the grinding technical requirement is extremely high, the piston rod can be broken by accident and the like; the piston system has too many weights, which increases the workload, when the pressure is 1400MPa, the output pressure at the other end can be 160MPa or 250MPa, and the application of the double reduction technology ensures that the piston system is broken because the area of the piston rod is extremely small when the pressure value is too high;
the piston system structure is shown in fig. 5, and the main parts comprise a piston cylinder 11, a hanging basket 12, a tray 13, a piston rod pressing cap 14, a piston rod 15, a piston cylinder 16, a groove compression nut 17 and a weight 18; when high-pressure liquid from the pressure reducer enters the cavity of the piston cylinder 11, the liquid pressure can make the piston rod 15 move upwards to load the weight 18 until the system is balanced. Namely the weight 18, the hanging basket 12, the tray 13, the piston rod pressing cap 14, the piston rod 15 and the piston cylinder 16, and the gravity of the parts is balanced with the liquid pressure borne by the piston rod.
When the multiplication multiple K of the multiplier is 5.6 (in fig. 2, the effective area of the high-pressure piston is 5.6 times of that of the ultrahigh-pressure piston), when the weight is loaded and the high-pressure generator is pressurized to 250MPa, the piston system is balanced, and the pressure value to be measured is 1400MPa, namely 1400MPa measurement is realized;
the invention can measure the ultra-high pressure of which the pressure is not more than 1400MPa, and the precision can reach 0.05 grade;
when the diameter of an ultrahigh pressure piston rod of the multiplier is 4mm and the diameter of a high pressure piston rod is 10mm, K is 6.25, namely, when the high pressure generator is pressurized to 224MPa, the pressure of 1400MPa can be measured;
when the diameter of an ultrahigh pressure piston rod of the multiplier is 6mm and the diameter of a high pressure piston rod is 12mm, K is 4, and when the high pressure generator is pressurized to 160MPa, the pressure of 640MPa can be measured;
when the diameter of an ultrahigh pressure piston rod of the multiplier is 6mm and the diameter of a high pressure piston rod is 12mm, K is 4, and when the high pressure generator is pressurized to 250MPa, the pressure of 1000MPa can be measured;
both the change in the K value and the pressure value generated by the high pressure generator can influence the measurable value.
Claims (6)
1. The ultrahigh pressure piston type pressure gauge with the range of 1400MPa is characterized by comprising a high pressure generator and a pressure reducer, wherein the high pressure generator is connected with a multiplier, one end of the pressure reducer is connected with a high pressure piston system, the other end of the pressure reducer and the multiplier are respectively connected with an instrument to be detected through ultrahigh pressure pipelines, the pressure reducer is connected with a precompression pump through a stop valve, and the precompression pump is connected with the multiplier through two stop valves connected in parallel.
2. The ultra-high pressure piston type pressure gauge with the range of 1400MPa as claimed in claim 1, wherein the multiplier comprises an upper housing (1) and a lower housing (10) which are connected with each other, a groove is formed in the upper housing (1), an ultra-high pressure piston cylinder (3) is embedded in the groove, an ultra-high pressure stopper (4) is embedded in the groove opening through a thread structure, the ultra-high pressure stopper (4) is connected with the ultra-high pressure piston cylinder (3) for fixing the ultra-high pressure piston cylinder (3), and an ultra-high pressure piston rod (6) is embedded in the ultra-high pressure piston cylinder (3); the precompression pump is connected with the output end of the ultrahigh pressure piston cylinder (3) through a stop valve A;
a groove A is formed in the lower shell (10), a high-pressure piston cylinder (9) is embedded in the groove A, a high-pressure stop block (7) is embedded in the groove opening through a thread structure, the high-pressure stop block (7) is connected with the high-pressure piston cylinder (9) and used for fixing the high-pressure piston cylinder (9), a high-pressure piston rod (8) is embedded in the high-pressure piston cylinder (9), and the high-pressure piston cylinder (9) is connected with a pressure reducer; the output end of the high-pressure piston cylinder (9) is connected with a pressure reducer, a stop valve B is connected between the pressure reducer and the high-pressure piston cylinder (9), and the stop valve B is connected with a precompression pump;
still include piston cylinder (5), in casing (1) and lower casing (10) are gone up to piston cylinder (5) both ends embedding respectively, and superhigh pressure piston rod (6) and high-pressure piston cylinder (9) are relative and all be located piston cylinder (5).
3. The ultra-high pressure piston type pressure gauge with the measuring range of 1400MPa as claimed in claim 2, wherein a sealing ring (2) is further provided between the ultra-high pressure piston cylinder (3) and the upper housing (1), and a sealing ring a is further provided between the high pressure piston cylinder (9) and the lower housing (10);
the ultrahigh pressure piston rod (6) tip is equipped with protruding structure, and the one end that high pressure piston rod (8) and ultrahigh pressure piston rod (6) are relative is equipped with the recess with protruding structure complex, goes up casing (1) and meets through the screw down casing (10), and inside piston cylinder (5) are located casing (1) and casing (10) junction down.
4. The ultra-high pressure piston type pressure gauge with the measuring range of 1400MPa according to claim 1, wherein the high pressure piston system comprises a piston cylinder (11), a piston cylinder (16) is arranged in the piston cylinder (11), a piston rod (15) is embedded in the piston cylinder (16), one end of the piston rod (15) far away from the piston cylinder (16) is connected with a piston rod gland (14), the piston rod gland (14) is connected with a hanging basket (12), an air inlet is arranged at the bottom of the piston cylinder (11), the air inlet is communicated with the piston cylinder (16), and the air inlet is connected with the output end of the pressure reducer.
5. The ultra-high pressure piston manometer with range of 1400MPa as claimed in claim 4, characterized in that the connection of the piston cylinder (11) and the piston cylinder (16) is further provided with a groove gland nut (17).
6. The ultrahigh-pressure piston type pressure gauge with the measuring range of 1400MPa according to claim 4, wherein the hanging basket (12) is sleeved outside the piston cylinder (11), and a weight stand is further arranged at the position, located on the outer side of the piston cylinder (11), of the hanging basket (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111663021.8A CN114518189B (en) | 2021-12-30 | 2021-12-30 | Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111663021.8A CN114518189B (en) | 2021-12-30 | 2021-12-30 | Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa |
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| CN114518189B CN114518189B (en) | 2024-06-11 |
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