An ultra-high pressure reciprocating seal test device

Abstract

The present invention discloses an ultra-high pressure reciprocating sealing test device, including a thick-walled cylinder, an oil collecting end cover, a sealing assembly, a reciprocating motion mechanism, a high-pressure oil injection system, a sensor system and an oil collecting device; the oil collecting end cover has two groups, and the two groups of oil collecting end covers are transition-fitted and installed at the two ends of the thick-walled cylinder respectively; the sealing assembly is placed in the thick-walled cylinder; the high-pressure oil injection system is connected to the thick-walled cylinder; the reciprocating motion mechanism passes through the sealing assembly and the two groups of oil collecting end covers; the oil collecting device has two groups, which are respectively connected to the two groups of oil collecting end covers. In the present invention, a series of micro grooves are provided along the axial direction on the inner surface of the elastic sleeve. When working, the micro grooves are filled with high-pressure oil. The sealing surface of the elastic sleeve is deformed under the action of internal and external pressures to achieve sealing. The elastic sleeve is elastic, easy to disassemble and install, and convenient for test operation.

Description

Technical Field

[0001] The invention relates to the field of fluid ultra-high pressure technology and mechanical engineering, and in particular to an ultra-high pressure reciprocating sealing test device. Background Art

[0002] Metal gap seals have a simple structure. As a dynamic seal, they can work for a long time under harsh working conditions. They have important applications in power engineering, oil extraction and mechanical engineering, and are often used in fuel injection systems, oil fracturing pumps and other devices. Therefore, the study of the sealing performance of metal gap seals, especially the measurement of friction and leakage, is of great significance to the design of high-performance metal gap seals. Since metal gap sealing involves comprehensive sealing technology of multiple disciplines such as materials science, mechanics, mechanics, tribology and heat transfer, it is difficult to measure physical quantities such as friction and leakage in reciprocating sealing systems, and it is even more difficult to measure under high pressure or high temperature conditions. At present, there are almost no ultra-high pressure reciprocating sealing test devices. The similar literature mainly includes: Patent (application number: CN201510993184.0 and CN201410639718.5) discloses two rubber ring high pressure dynamic sealing test devices, but this test device is mainly for gas sealing, and the sealing pressure condition is also limited; Patent (application number: CN105738039A) discloses a plunger-copper sleeve pair annular gap flow measurement device and measurement method, but the invention only provides a plunger-copper sleeve pair static flow measurement, and the maximum test pressure is 10MPa. The test device of the present invention is mainly for the measurement of dynamic sealing performance under ultra-high pressure conditions with a pressure condition of more than 100MPa. Summary of the invention

[0003] The purpose of the present invention is to provide an ultra-high pressure reciprocating sealing test device to solve the technical problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-high pressure reciprocating sealing test device, comprising a thick-walled cylinder, an oil collecting end cover, a sealing assembly, a reciprocating motion mechanism, a high-pressure oil injection system, a sensing system and an oil collecting device; the oil collecting end cover has two groups, and the two groups of oil collecting end covers are respectively transitionally mounted at the two ends of the thick-walled cylinder, and are fastened to the thick-walled sleeve by bolts, and an oil collecting hole is opened on the oil collecting end cover; the sealing assembly is placed in the thick-walled cylinder; the high-pressure oil injection system is connected to the thick-walled cylinder; the reciprocating motion mechanism passes through the sealing assembly and the two groups of oil collecting end covers; the oil collecting device has two groups, which are respectively connected to the two groups of oil collecting end covers; the sensing system includes a pressure gauge, a tension and compression sensor and a speed sensor, the pressure gauge is connected to the high-pressure oil injection system, the tension and compression sensor is installed on the reciprocating motion mechanism, and the speed sensor is vertically placed on the outside of the reciprocating motion mechanism.

[0005] Furthermore, it also includes a sealing gasket, wherein there are two sealing gaskets, and the sealing gaskets are arranged between the oil collecting end cover and the thick-walled cylinder.

[0006] Furthermore, the oil collecting end cover includes an inner boss, a mating surface and an outer boss, the inner boss is connected to the outer boss through the mating surface, bolt holes are symmetrically provided on the mating surface, the inner ring diameter of the outer boss is larger than the inner ring diameter of the inner boss, the inner ring of the outer boss is connected to the inner ring of the inner boss through a conical surface transition, an oil baffle is also provided on the outer side of the inner ring of the outer boss, and the oil collecting hole is provided on the side of the inner ring of the outer boss.

[0007] Furthermore, the sealing assembly includes an elastic sleeve, a combined static seal and a supporting spring. There are two groups of elastic sleeves. The outer cylindrical surfaces of the two groups of elastic sleeves are mounted in cooperation with the inner hole of the thick-walled cylinder. The top surfaces of the two groups of elastic sleeves are connected by supporting springs. The bottom surfaces of the two groups of elastic sleeves are tightly pressed against the oil collecting end cover. There are two groups of combined static seals, which are respectively sleeved on the necks of the elastic sleeves.

[0008] Furthermore, a series of micro grooves are provided on the inner surface of the elastic sleeve along the axial direction.

[0009] Furthermore, the reciprocating motion mechanism includes a plunger, a connector, a motor connecting rod and a linear motor, one end of the plunger is connected to the motor connecting rod through the connector, the other end of the motor connecting rod is connected to the linear motor, and the other end of the plunger passes through two sets of oil collecting end covers and sealing assemblies.

[0010] Furthermore, the high-pressure oil injection system includes an oil injection interface, an oil injection conduit and a high-pressure oil injection device, one end of the oil injection conduit is connected to the high-pressure oil injection device, the other end of the oil injection conduit is connected to one end of the oil injection interface, and the other end of the oil injection interface is connected to the thick-walled cylinder.

[0011] Furthermore, the oil collection device includes an oil outlet conduit and an oil collector. The oil outlet conduit and the oil collector each have two groups. One end of the oil outlet conduit is connected to the oil collecting hole of the oil collecting end cover, and the other end of the oil outlet conduit is connected to the oil collector.

[0012] Furthermore, the sensing system also includes a speed signal transmission line, a force signal transmission line and a data terminal. The tension and compression sensor transmits the signal to the data terminal input end through the force signal transmission line, and the speed sensor transmits the signal to the data terminal input end through the speed signal transmission line.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: a series of micro grooves are provided along the axial direction on the inner surface of the elastic sleeve in the present invention; when working, the micro grooves are filled with high-pressure oil; the sealing surface of the elastic sleeve is deformed under the action of internal and external pressures to achieve sealing; the elastic sleeve is elastic, easy to disassemble and install, and convenient for test operation; the prior art drive systems mostly use a crankshaft connecting rod type to convert rotational motion into reciprocating motion; the present invention directly uses a linear motor to drive the plunger to reciprocate motion, thereby making the test device more compact and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the composition structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the oil collecting end cover structure of the present invention.

[0016] In the figure: 1. thick-walled cylinder; 2. oil collecting end cover; 2-1. conical surface; 2-2. oil collecting hole; 2-3. bolt hole; 2-4. mating surface; 2-5. oil baffle; 3. elastic sleeve; 4. combined static seal; 5. support spring; 6. oil filling interface; 7. oil filling guide tube; 8. high-pressure oil filling device; 9. plunger; 10. connector; 11. tension and compression sensor; 12. linear motor; 13. speed sensor; 14. data terminal; 15. speed signal transmission line; 16. force signal transmission line; 17. oil collector; 18. oil outlet guide tube; 19. high-pressure oil chamber; 20. sealing gasket; 21. pressure gauge; 22. motor connecting rod. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1The present invention provides a technical solution: an ultra-high pressure reciprocating sealing test device, comprising a thick-walled cylinder 1, an oil collecting end cover 2, a sealing assembly, a high-pressure oil injection system, a reciprocating motion mechanism, a sensing system and an oil collecting device; the oil collecting end cover 2 has two groups, and the two groups of oil collecting end covers 2 are respectively installed at the two ends of the thick-walled cylinder 1 with transition fit; the sealing assembly is placed in the thick-walled cylinder 1; the high-pressure oil injection system is connected to the thick-walled cylinder 1; the reciprocating motion mechanism passes through the sealing assembly and the two groups of oil collecting end covers 2; the oil collecting device has two groups, which are respectively connected to the two groups of oil collecting end covers 2; the sensing system comprises a pressure gauge 21, a tension and compression sensor 11 and a speed sensor 13, the pressure gauge 21 is connected to the high-pressure oil injection system, the tension and compression sensor 11 is installed on the reciprocating motion mechanism, and the speed sensor 13 is vertically placed on the outside of the reciprocating motion mechanism. At the same time, a sealing gasket 20 is installed between the oil collecting end cover 2 and the thick-walled cylinder 1 to prevent oil leakage.

[0019] See also Figure 2 The oil collecting end cover 2 includes an inner boss, a mating surface 2-4 and an outer boss. The inner boss is connected to the outer boss through the mating surface 2-4. Bolt holes 2-3 are symmetrically provided on the mating surface 2-4. The bolts pass through the bolt holes 2-3 and are fastened to the thick-walled cylinder 1. The inner ring diameter of the outer boss is larger than the inner ring diameter of the inner boss. The inner ring of the outer boss is transitionally connected to the inner ring of the inner boss through a conical surface 2-1. An oil retaining platform 2-5 is also provided on the outer side of the inner ring of the outer boss to prevent oil leakage. The oil collecting hole 2-2 is provided on the side of the inner ring of the outer boss.

[0020] The sealing assembly includes an elastic sleeve 3, a combined static seal 4 and a supporting spring 5. The elastic sleeve 3 has two groups. The outer cylindrical surfaces of the two groups of elastic sleeves 3 are mounted in cooperation with the inner hole of the thick-walled cylinder 1. The top surfaces of the two groups of elastic sleeves 3 are connected by the supporting spring 5 to ensure that the bottom surfaces of the two groups of elastic sleeves 3 are tightly pressed against the oil collecting end cover 2. The combined static seal 4 has two groups. The combined static seal 4 is respectively sleeved on the neck of the elastic sleeve 3 to prevent oil from leaking from the gap between the outer cylindrical surface of the elastic sleeve 3 and the inner hole of the thick-walled cylinder 1; a series of micro grooves are axially arranged on the inner surface of the elastic sleeve 1. When working, the micro grooves are filled with high-pressure oil, and the sealing surface of the elastic sleeve is deformed under the action of internal and external pressures to achieve sealing.

[0021] The reciprocating motion mechanism includes a plunger 9, a connector 10, a motor connecting rod 22 and a linear motor 12. One end of the plunger 9 is connected to the motor connecting rod 22 through the connector 10, and the other end of the motor connecting rod 22 is connected to the linear motor 12. The other end of the plunger 9 passes through two sets of oil collecting end covers 2 and a sealing assembly; the plunger 9, the elastic copper sleeve 3, and the thick-walled barrel 1 together form a high-pressure oil chamber 19. The linear motor 12 provides the plunger 9 with reciprocating power, and the plunger 9 performs reciprocating motion relative to the elastic copper sleeve 3.

[0022] The high-pressure oil injection system includes an oil injection interface 6, an oil injection conduit 7 and a high-pressure oil injection device 8. One end of the oil injection conduit 7 is connected to the high-pressure oil injection device 8, and the other end of the oil injection conduit 7 is connected to one end of the oil injection interface 6. The other end of the oil injection interface 6 is connected to the thick-walled cylinder 1. The high-pressure oil injection device 8 can provide ultra-high pressures of different pressure values, and oil is injected into the high-pressure oil chamber 19 through the oil injection conduit 7 and the oil injection interface 6.

[0023] The oil collecting device includes an oil outlet conduit 18 and an oil collector 17. The oil outlet conduit 18 and the oil collector 17 are each in two groups. One end of the oil outlet conduit 18 is connected to the oil collecting hole 2-2 of the oil collecting end cover 2, and the other end of the oil outlet conduit 18 is connected to the oil collector 17. The leaked oil flows out from the oil collecting hole 2-2 and enters the oil collector 17 through the oil outlet conduit 18, thereby completing the measurement of the leakage amount.

[0024] The sensing system also includes a speed signal transmission line 15, a force signal transmission line 16 and a data terminal 14. The pressure gauge 21 is installed on the outside of the oil filling interface 6 in the high-pressure oil filling system. The oil provided by the high-pressure oil filling device 8 enters the high-pressure oil chamber 19 through the oil filling conduit 7 and the oil filling interface 6, and is monitored in real time by the pressure gauge 21; the tension and compression sensor 11 is installed on the connector 10, and the friction force between the plunger 9 and the elastic copper sleeve 3 is measured by the tension and compression sensor 11, and transmitted to the data terminal 14 through the force signal transmission line 16; the speed sensor 15 is placed vertically on the outside of the motor connecting rod 22, and the reciprocating speed of the plunger 9 measured by the speed sensor 13 is transmitted to the data terminal 14 through the speed signal transmission line 15, thereby completing the measurement of the friction force.

[0025] Working principle: The high-pressure oil injection device 8 can provide the required pressure value, and inject the provided oil into the high-pressure oil chamber 19 through the oil injection conduit 7 and the oil injection interface 6, and is monitored in real time by the pressure gauge 21. The linear motor 12 provides the power for reciprocating motion, driving the plunger 9 to reciprocate relative to the elastic copper sleeve 3. The inner surface of the elastic sleeve 3 is axially provided with a series of micro grooves. During operation, the micro grooves are filled with high-pressure oil. The sealing surface of the elastic sleeve 3 is deformed under the action of internal and external pressures to achieve sealing. During the reciprocating motion, the friction between the plunger 9 and the elastic copper sleeve 3 is measured by the tension and compression sensor 11 on the connector 10, and the reciprocating speed of the plunger 9 is measured by the speed sensor 13 placed vertically on the outside of the motor connecting rod 22; the leaked oil flows out from the oil collecting hole 2-2, enters the oil collector 17 through the oil outlet conduit 18, thereby completing the measurement of the leakage amount.

[0026] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0027] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-high pressure reciprocating seal test device, characterized in that: It comprises a thick-walled cylinder (1), an oil collecting end cover (2), a sealing assembly, a reciprocating mechanism, a high-pressure oil injection system, a sensor system and an oil collection device; the oil collecting end cover (2) comprises two sets, the two sets of oil collecting end covers (2) are respectively installed at the two ends of the thick-walled cylinder (1) in a transition fit, and are fastened to the thick-walled cylinder (1) by bolts, and the oil collecting end cover (2) is provided with an oil collecting hole (2-2); the sealing assembly is placed in the thick-walled cylinder (1); the high-pressure oil injection system is connected to the thick-walled cylinder (1); the reciprocating mechanism passes through the sealing assembly and the two sets of oil collecting end covers (2); The oil collection device has two groups, which are respectively connected to the two groups of oil collecting end covers (2); the sensing system comprises a pressure gauge (21), a tension and compression sensor (11) and a speed sensor (13); the pressure gauge (21) is connected to the high-pressure oil injection system, the tension and compression sensor (11) is installed on the reciprocating mechanism, and the speed sensor (13) is placed vertically on the outside of the reciprocating mechanism; The oil collecting end cover (2) comprises an inner boss, a mating surface (2-4) and an outer boss, the inner boss is connected to the outer boss via the mating surface (2-4), bolt holes (2-3) are symmetrically provided on the mating surface (2-4), the inner ring diameter of the outer boss is larger than the inner ring diameter of the inner boss, the inner ring of the outer boss is transitionally connected to the inner ring of the inner boss via a conical surface (2-1), an oil retaining platform (2-5) is further provided on the outer side of the inner ring of the outer boss, and the oil collecting hole (2-2) is provided on the side of the inner ring of the outer boss; The sealing assembly comprises an elastic sleeve (3), a combined static seal (4) and a support spring (5). The elastic sleeve (3) has two groups, the outer cylindrical surfaces of the two groups of elastic sleeves (3) are matched and installed with the inner hole of the thick-walled cylinder (1), the top surfaces of the two groups of elastic sleeves (3) are connected through the support spring (5), and the bottom surfaces of the two groups of elastic sleeves (3) are tightly pressed against the oil collecting end cover (2). The combined static seal (4) has two groups, and the combined static seal (4) is respectively sleeved on the neck of the elastic sleeve (3); the inner surface of the elastic sleeve (3) is provided with a series of micro grooves along the axial direction; The reciprocating mechanism comprises a plunger (9), a connector (10), a motor connecting rod (22) and a linear motor (12); one end of the plunger (9) is connected to the motor connecting rod (22) via the connector (10); the other end of the motor connecting rod (22) is connected to the linear motor (12); and the other end of the plunger (9) passes through two sets of oil collecting end covers (2) and a sealing assembly; The high-pressure oil injection system comprises an oil injection interface (6), an oil injection conduit (7) and a high-pressure oil injection device (8); one end of the oil injection conduit (7) is connected to the high-pressure oil injection device (8); the other end of the oil injection conduit (7) is connected to one end of the oil injection interface (6); and the other end of the oil injection interface (6) is connected to the thick-walled cylinder (1); the oil collection device comprises an oil outlet conduit (18) and an oil collector (17); the oil outlet conduit (18) and the oil collector (17) each have two groups; one end of the oil outlet conduit (18) is connected to the oil collecting hole (2-2) on the oil collecting end cover (2); and the other end of the oil outlet conduit (18) is connected to the oil collector (17).

2. The ultra-high pressure reciprocating sealing test device according to claim 1, characterized in that: It also includes a sealing gasket (20), two of which are arranged between the oil collecting end cover (2) and the thick-walled cylinder (1).

3. The ultra-high pressure reciprocating sealing test device according to claim 1, characterized in that: The sensing system further comprises a speed signal transmission line (15), a force signal transmission line (16) and a data terminal (14); the tension and compression sensor (11) transmits a signal to an input end of the data terminal (14) via the force signal transmission line (16); and the speed sensor (13) transmits a signal to an input end of the data terminal (14) via the speed signal transmission line (15).

Images