A floating seal assembly test device

Abstract

The application discloses a kind of floating seal assembly test device, including the front cover, cylinder and rear cover of jointly constituting chamber and the piston rod rotationally arranged in chamber through rear cover, piston rod front end part is provided with coaxial eccentric disc, it is used to eccentric sleeve floating seal assembly on piston rod, annular wear-resistant lining plate is recessed in the inner end surface of front cover, piston tool is set between piston rod front end part and cylinder, high-pressure gas is introduced into floating seal assembly to push floating seal assembly and press wear-resistant lining plate, lubricating oil is also introduced into floating seal assembly to form oil film seal between floating seal assembly and wear-resistant lining plate, pressure sensor is provided in the middle of front cover, it is used to detect gas leakage between floating seal assembly and the inner end surface of front cover.The application simulates the running condition of actual working condition, detects the rotation of floating seal assembly Dynamic seal, eccentric and end face tightness, simultaneously optimize assembly fit clearance and guide optimization existing floating seal assembly structure design.

Description

Technical Field

[0001] This invention relates to the field of natural gas and oil / gas pressurization and blending technology. More specifically, this invention relates to a testing device for a floating sealing assembly. Background Technology

[0002] Rotary compressors or positive displacement pumps are booster devices that combine the functions of both pumps and compressors. They are widely used in production applications such as mixed oil and gas transportation and drainage / gas extraction, primarily adaptable to the single or mixed transportation of media such as natural gas, water, and light oil. The end-face sealing performance of these rotary compressors and positive displacement pumps is a key factor in ensuring their reliable operation, and floating seal assemblies are generally used for sealing. Developing a floating seal assembly test device to better simulate various disturbances during actual operation, study the dynamic characteristics of the floating seal assembly, and guide its design is particularly important.

[0003] Currently authorized and published patents include "A Rotary Dynamic Seal Performance Test Device" (Patent No.: 202120968783.8, Publication No.: CN214583828U) and "A Labyrinth Seal Test Device" (Patent No.: 202010781829.5, Publication No.: 111964849B), etc. The above sealing test devices can only meet the test requirements of rotary dynamic seals and labyrinth seal rings, but cannot meet the test requirements of floating seal components or end face seal components, which, in addition to rotary dynamic seals, also include eccentric and end face seals. Summary of the Invention

[0004] One objective of this invention is to provide a floating seal assembly testing device that simulates actual operating conditions, detects the rotational dynamic sealing, eccentricity, and end-face sealing performance of the floating seal assembly, and optimizes the assembly clearance and guides the optimization of the structural design of existing floating seal assemblies.

[0005] To achieve these objectives and other advantages according to the present invention, a floating seal assembly testing device is provided, comprising a front cover, a cylinder, and a rear cover that together form a chamber, and a piston rod rotatably disposed within the chamber through the rear cover. A coaxial eccentric disk is provided at the front end of the piston rod, and an eccentric hole is provided at its end. The floating seal assembly is eccentrically mounted on the piston rod via the eccentric disk. An annular wear-resistant liner is recessed on the inner end face of the front cover and contacts the floating seal assembly. A piston fixture is fitted between the front end of the piston rod and the cylinder. High-pressure gas is introduced into the floating seal assembly to push the floating seal assembly to press against the wear-resistant liner. Lubricating oil is also introduced into the floating seal assembly to form an oil film seal between the floating seal assembly and the wear-resistant liner. A pressure sensor is provided in the middle of the front cover for detecting gas leakage between the floating seal assembly and the inner end face of the front cover.

[0006] Preferably, a round roller bearing is provided in the middle of the piston rod, which is locked to the piston rod by a clamping nut, and a step is provided on the piston rod corresponding to the round roller bearing for positioning and mounting the round roller bearing.

[0007] Preferably, the roller bearing is fixed to the cylinder body by a mounting base, and the mounting base forms an enlarged step to position and fit the roller bearing.

[0008] Preferably, a fixed flange is fitted on the piston rod and connected to the piston tooling. A Glyd ring retaining ring is also fitted on the piston rod and connected radially to the mounting base. The Glyd ring retaining ring is pressed by a gland and fitted onto the fixed flange through a connecting seat. An axial channel is provided in the middle of the piston rod, and two annular channels are also provided on the piston rod, both of which connect the axial channel and the outside of the piston rod. An air injection port is provided on the cylinder body, which sequentially connects to the annular channel at the rear end of the piston rod, the axial channel, the annular channel at the front end, the contact surface between the piston tooling and the cylinder body, and the contact surface between the piston tooling and the wear-resistant liner, and finally enters the annular space of the floating seal assembly.

[0009] Preferably, the cylinder body is provided with an oil inlet, and the piston tooling is provided with a corresponding lubricating oil channel that extends to the wear-resistant liner and the floating seal assembly. The lubricating oil enters the contact surface between the wear-resistant liner and the piston tooling and the floating seal assembly through the oil inlet and the lubricating oil channel. The front cover is provided with an oil drain port that is connected to the oil inlet.

[0010] Preferably, both the oil inlet and the oil outlet are equipped with ball valves. The oil inlet is connected to the outer cooling oil pipe, which delivers front-end cooling lubricating oil. The front cover is provided with a circulating water chamber, which circulates coolant through the coolant inlet and outlet to cool the floating sealing assembly.

[0011] Preferably, the mounting base, the roller bearing, the rear cover, and the cylinder body have a lubricating oil cavity. The cylinder body is provided with a lubricating oil inlet and a lubricating oil outlet. The lubricating oil inlet is connected to a cooling oil tank, which is connected to an oil storage tank. The lubricating oil in the oil storage tank is cooled by an oil cooler and then transported to the cooling oil tank. The lubricating oil output from the lubricating oil outlet returns to the oil storage tank.

[0012] Preferably, a self-aligning bearing is installed inside the rear cover, which is connected to the rear end of the piston rod.

[0013] Preferably, the front cover includes a pressure ring, a wear-resistant liner, and a flange cover. The flange cover has an annular notch on its outer side for mounting the pressure ring via a pin, while simultaneously adjusting the gap between the floating sealing ring and the wear-resistant liner. The wear-resistant liner is recessed on the inner end face of the flange cover.

[0014] Preferably, the cylinder is mounted on the base via a support.

[0015] The present invention has at least the following beneficial effects: The floating seal assembly testing device of the present invention tests the rotational dynamic sealing, eccentricity, and end-face sealing performance of the floating seal assembly by simulating actual operating conditions. Simultaneously, it optimizes assembly clearances and guides the optimization of the structural design of existing floating seal assemblies. The structural design of the testing device has the following beneficial effects: ① Solve assembly error problems a. Tapered roller bearings are used for positioning on the piston rod as an installation reference to ensure assembly accuracy; b. An enlarged step is used on the mating surface on the outer side of the tapered roller bearing to reduce the mating surface area and lower the difficulty of disassembly and assembly; c. The piston rod is split into two parts, and torque is transmitted through a key connection. The piston rod is separated from the eccentric disc at the mating end of the end face floating seal assembly, which facilitates disassembly and assembly. d. Disassemble the front cover into two parts: a pressure ring and a wear-resistant liner, to reduce the thickness. At the same time, add a flange cover to ensure the assembly clearance between the floating sealing assembly and the wear-resistant liner.

[0016] ② Solve the dry gas sealing problem The oil inlet and outlet of the end face floating seal assembly chamber are equipped with ball valves. The circulating front-end coolant provides an oil film sealing environment on the one hand, and cools the friction surface of the floating seal assembly on the other hand.

[0017] ③ Solve the problem of excessive temperature rise in tooling The accompanying oil cooling system lubricates the bearings inside the cylinder and continuously cools the Glyd ring retainer ring during the test.

[0018] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the floating sealing assembly test device of the present invention; Figure 2 This is a schematic diagram of the experimental device with a circulating water chamber installed according to the present invention; Figure 3 The floating sealing component test device of the present invention is used to detect the sealing point.

[0020] Explanation of reference numerals in the attached figures: 1. Pressure ring, 2. Wear-resistant liner, 3. Flange gland, 4. Rear cover, 5. Pressure plate, 6. Support seat, 7. Base, 8. Lubricating oil inlet, 9. Lubricating oil outlet, 10. Pressure sensor, 11. Oil inlet, 12. Air inlet, 13. Self-aligning bearing, 14. Cylinder block, 15. Piston tooling, 16. Front cover, 17. Floating seal assembly, 18. Connecting seat, 19. Eccentric disc, 20. Piston rod, 21. Mounting seat, 22. Compression nut, 23. Fixed flange, 24. Glyd ring retaining ring, 25. Gland, 26. Round roller bearing, 27. Circulating water chamber. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] like Figure 1 As shown, the present invention provides a test device for a floating sealing assembly 17, including a front cover 16, a cylinder 14, and a rear cover 4 that together form a chamber, and a piston rod 20 that is rotatably disposed in the chamber through the rear cover 4. The front end of the piston rod 20 is provided with a coaxial eccentric disk 19, and its end is provided with an eccentric hole. The floating sealing assembly 17 is eccentrically mounted on the piston rod 20 through the eccentric disk 19. The inner end face of the front cover 16 is recessed with an annular wear-resistant liner 2, which contacts the floating sealing assembly 17. A piston fixture 15 is sleeved between the front end of the piston rod 20 and the cylinder 14. High-pressure gas is introduced into the floating sealing assembly 17 to push the floating sealing assembly 17 to press the wear-resistant liner 2. Lubricating oil is also introduced into the floating sealing assembly 17 to form an oil film seal between the floating sealing assembly 17 and the wear-resistant liner 2. A pressure sensor 10 is provided in the middle of the front cover 16, which is used to detect gas leakage between the floating sealing assembly 17 and the inner end face of the front cover 16.

[0024] A floating seal assembly 17 is eccentrically mounted on the piston rod 20 between the front cover 16 and the piston rod 20. The piston rod 20 is disassembled into two parts. The main part is a rotating component with an eccentric disk 19 at the front end. The two parts are connected by a key to transmit torque. An eccentric hole (approximately 6mm eccentricity) is machined on the eccentric disk 19 at the end of the piston rod 20. The floating seal assembly 17 is then mounted on the eccentric disk 19. A motor is connected to the rear end of the piston rod 20, located behind the cylinder body 14 and the rear cover 4, to drive the piston rod 20 to rotate, thereby rotating the floating seal assembly 17 and simulating the eccentric movement of the actual floating seal assembly 17. By disassembling the piston rod 20 into two parts and connecting them by a key to transmit torque, the piston rod 20 and the mating end of the floating seal assembly 17 are separated, facilitating the installation and removal of the floating seal assembly 17.

[0025] like Figure 1 As shown, high-pressure gas is injected from the air pump through the air injection port 12, and enters the annular space of the sealing ring in the floating sealing assembly 17 through the arrow path connected to the air injection port 12, thereby pushing the floating sealing assembly 17 to press against the wear-resistant liner 2 provided on the inner end face of the front cover 16. The front cover 16 is provided with a gas chamber pressure detection port, which is connected to the air injection port 12. The gas chamber pressure detection port detects the injection pressure through the pressure sensor 10, and the gas leakage can be calculated by conversion. High-pressure gas flows along the floating sealing assembly 17 and the wear-resistant liner 2 (e.g., ... Figure 1 Leakage occurs in the gap between the leak paths (as shown by the arrow below), while the floating seal assembly 17 presses the wear-resistant liner 2 under high-pressure air thrust to form an oil film seal on the leak paths.

[0026] In another embodiment, a tapered roller bearing 26 is provided in the middle of the piston rod 20, which is locked to the piston rod 20 by a clamping nut 22. A step is provided on the piston rod 20 corresponding to the tapered roller bearing 26 for positioning and mounting the bearing 26. Adding a tapered roller bearing step to the piston rod 20 for positioning and locking by the clamping nut 22 serves as an installation reference for the piston rod 20, ensuring axial installation accuracy.

[0027] In another embodiment, the round roller bearing 26 is fixed to the cylinder body 14 by a mounting base 21, the mounting base 21 forming an enlarged step to position and fit the round roller bearing 26. The round roller bearing 26 is fixed to the cylinder body 14 as a reference for the mounting base 21. The enlarged step on the outer mating surface of the tapered roller bearing reduces the mating surface area and lowers the difficulty of disassembly and assembly.

[0028] In another embodiment, a fixed flange 23 is fitted on the piston rod 20 and connected to the piston tooling 15. A Glyd ring retaining ring 24 is also fitted on the piston rod 20 and connected to the mounting seat 21 radially outward. The Glyd ring retaining ring 24 is pressed by a pressure cap 25 and fitted onto the fixed flange 23 through a connecting seat 18. The inwardly extending step of the mounting seat 21 is used to contact and install the Glyd ring retaining ring 24 and the tapered roller bearing, respectively. An axial channel is provided in the middle of the piston rod 20. Two annular channels are also provided on the piston rod 20, both of which connect the axial channel and the outside of the piston rod 20. An air injection port 12 is provided on the cylinder body 14, which sequentially connects to the annular channel at the rear end of the piston rod 20, the axial channel, the annular channel at the front end, the contact surface between the piston tooling 15 and the cylinder body 14, and the contact surface between the piston tooling 15 and the wear-resistant liner 2, and finally enters the annular space of the floating seal assembly 17.

[0029] The gland 25 presses the Glyd ring retaining ring 24 and is fitted onto the fixed flange 23 via the connecting seat 18. It is then connected to the piston fixture 15 axially and radially to the mounting seat 21. The Glyd ring retaining ring has a gas flow channel on its outer side, and the piston fixture 15 is also provided with a gas flow port and a slot.

[0030] In another embodiment, the cylinder body 14 is provided with an oil inlet 11, and the piston tooling 15 is provided with a corresponding lubricating oil channel, which extends to the wear-resistant liner 2 and the floating seal assembly 17. The lubricating oil enters the contact surface between the wear-resistant liner 2 and the piston tooling 15 and the floating seal assembly 17 through the oil inlet 11 and along the lubricating oil channel. The front cover 16 is provided with an oil drain port, which is connected to the oil inlet 11.

[0031] In another embodiment, both the oil inlet 11 and the oil outlet 11 are equipped with ball valves. The oil inlet 11 is connected to an outer cooling oil pipe, through which front-end cooling lubricating oil is delivered. Figure 2 As shown, the front cover is provided with a circulating water chamber 27, which circulates coolant through the coolant inlet and outlet to cool the floating sealing assembly.

[0032] The oil inlet 11 and oil outlet of the floating seal assembly 17 chamber are equipped with ball valves. The circulating front-end coolant provides an oil film sealing environment and cools the friction surface of the floating seal assembly 17. In addition to the cooling required for oil injection, the floating seal assembly also needs cooling. The floating seal assembly generates heat through friction during its movement, which can easily lead to failure. The test life of the floating seal assembly is improved by setting up a circulating water chamber 27.

[0033] In another embodiment, a lubricating oil cavity is provided between the mounting base 21, the round roller bearing 26, the rear cover 4, and the cylinder body 14. The cylinder body 14 is provided with a lubricating oil inlet 8 and a lubricating oil outlet 9. The lubricating oil inlet 8 is connected to a cooling oil tank, which is connected to an oil storage tank. The lubricating oil in the oil storage tank is cooled by an oil cooler and then transported to the cooling oil tank. The lubricating oil output from the lubricating oil outlet 9 is returned to the oil storage tank.

[0034] The rear cover 4 is fitted with a self-aligning bearing 13, which is connected to the rear end of the piston rod 20.

[0035] To ensure stable and smooth eccentric rotation of the piston rod 20, a two-stage bearing system is employed. The rear thrust self-aligning bearing 13 is fitted onto the rear cover 4 and secured by the pressure plate 5. The middle roller bearing 26 and the rear thrust self-aligning bearing 13 are used to correct the eccentric movement of the piston rod. Simultaneously, an oil cooler and oil tank cool the lubricating oil, which is then injected into the cavity formed by the cylinder body 14 and the rear cover 4 through the cooling oil tank via the lubricating oil inlet 8. The lubricating oil is discharged from the lubricating oil outlet 9 and returned to the oil cooler and oil tank, thus achieving lubrication and cooling of the bearings and Glyd ring retainer 24 within the cavity. While ensuring smooth airflow, the size of the Glyd ring retainer 24 is reduced to minimize heat generation.

[0036] In another embodiment, the front cover 16 includes a pressure ring 1, a wear-resistant liner 2, and a flange cover 3. The flange cover 3 has an annular notch on its outer side for mounting the pressure ring 1 via a pin, while simultaneously adjusting the gap between the floating sealing assembly 17 and the wear-resistant liner 2. The wear-resistant liner 2 is recessed into the inner end face of the flange cover 3. The front cover 16 is disassembled into two parts: the pressure ring 1 and the wear-resistant liner 2, reducing the thickness and adding the flange cover 3. The assembly gap between the floating sealing assembly 17 and the wear-resistant liner 2 is adjusted by adjusting the flange cover and the pressure ring 1.

[0037] In another embodiment, the cylinder body 14 is mounted on the base 7 via a support 6. The cylinder body 14 is mounted on the base 7 via hexagonal screws and the support 6.

[0038] The floating sealing assembly mainly includes a floating sealing ring, in which a steel ball is disposed at point D, located within an axial groove of the sealing ring. A gap exists between the axial groove and the steel ball. A radial groove is provided radially within the sealing ring, and a radial sealing ring is disposed therewith. The sealing point of the floating sealing assembly detected by the testing device of this application is as follows: Figure 3 As shown, it includes: ①Radial oil film seal A, natural gas leak detection port at the lower end, pressure difference Pm, is a gap seal, using steel balls to position the axial gap between the wear-resistant liner and the piston tooling.

[0039] ②Radial oil film seal B: Natural gas leaks to the front detection port, pressure difference Pm, floating sealing ring contacts and seals with wear-resistant liner. High-pressure gas is introduced into the annular space where the steel ball is located. The high-pressure gas presses the floating sealing ring tightly onto the wear-resistant liner to form an oil film seal.

[0040] ③ Axial oil film seal C, natural gas leaks to seals A and B, pressure difference Pg-Pm, slight interference contact seal between floating sealing ring and piston tooling + oil film seal.

[0041] ④ Oil film seal D, natural gas leak seal B, steel ball and axial annular groove, oil film seal.

[0042] ⑤ Seal E, O-ring elastic pre-compression, floating contact seal, floating sealing ring and piston tooling.

[0043] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A testing device for a floating sealing assembly, characterized in that, The device includes a front cover, a cylinder, and a rear cover that together form a chamber, as well as a piston rod that is rotatably disposed within the chamber through the rear cover. The piston rod has a coaxial eccentric disk at its front end with an eccentric hole at its end. A floating sealing assembly is eccentrically fitted onto the piston rod via the eccentric disk. An annular wear-resistant liner is recessed on the inner end face of the front cover and contacts the floating sealing assembly. A piston fixture is fitted between the front end of the piston rod and the cylinder. High-pressure gas is introduced into the floating sealing assembly to push it to press against the wear-resistant liner. Lubricating oil is also introduced into the floating sealing assembly to form an oil film seal between the floating sealing assembly and the wear-resistant liner. A pressure sensor is provided in the middle of the front cover to detect gas leakage between the floating sealing assembly and the inner end face of the front cover. A round roller bearing is provided in the middle of the piston rod, which is locked to the piston rod by a clamping nut. A step is provided on the piston rod corresponding to the round roller bearing to position and install the round roller bearing. The round roller bearing is fixed to the cylinder body by a mounting base, and the mounting base forms an enlarged step to position and fit the round roller bearing. A fixed flange is fitted onto the piston rod, which is connected to the piston tooling. A Glyd ring retaining ring is also fitted onto the piston rod, which is radially connected to the mounting base. The Glyd ring retaining ring is pressed by a gland and fitted onto the fixed flange through a connecting seat. An axial channel is provided in the middle of the piston rod. Two annular channels are also provided on the piston rod, both of which connect the axial channel and the outside of the piston rod. An air injection port is provided on the cylinder body, which sequentially connects to the annular channel at the rear end of the piston rod, the axial channel, the annular channel at the front end, the contact surface between the piston tooling and the cylinder body, and the contact surface between the piston tooling and the wear-resistant liner, and finally enters the annular space of the floating seal assembly.

2. The floating seal assembly testing device as described in claim 1, characterized in that, The cylinder body is provided with an oil inlet, and the piston tooling is provided with a corresponding lubricating oil channel, which extends to the wear-resistant liner and the floating seal assembly. The lubricating oil enters the contact surface between the wear-resistant liner and the piston tooling and the floating seal assembly through the oil inlet and the lubricating oil channel. The front cover is provided with an oil drain port, which is connected to the oil inlet.

3. The floating seal assembly testing device as described in claim 2, characterized in that, Both the oil inlet and outlet are equipped with ball valves. The oil inlet is connected to the outer cooling oil pipe, which delivers front-end cooling lubricating oil. The front cover is provided with a circulating water chamber, which circulates coolant through the coolant inlet and outlet to cool the floating sealing assembly.

4. The floating seal assembly testing device as described in claim 1, characterized in that, The mounting base, the round roller bearing, the rear cover, and the cylinder body have a lubricating oil chamber. The cylinder body is provided with a lubricating oil inlet and a lubricating oil outlet. The lubricating oil inlet is connected to a cooling oil tank, which is connected to an oil storage tank. The lubricating oil in the oil storage tank is cooled by an oil cooler and then transported to the cooling oil tank. The lubricating oil output from the lubricating oil outlet returns to the oil storage tank.

5. The floating seal assembly testing device as described in claim 1, characterized in that, The rear cover is fitted with a self-aligning bearing, which is connected to the rear end of the piston rod.

6. The floating seal assembly testing apparatus as described in claim 1, characterized in that, The front cover includes a pressure ring, a wear-resistant liner, and a flange cover. The flange cover has an annular notch on its outer side for mounting the pressure ring via a pin, and for adjusting the gap between the floating sealing ring and the wear-resistant liner. The wear-resistant liner is recessed on the inner end face of the flange cover.

7. The floating seal assembly testing apparatus as described in claim 1, characterized in that, The cylinder body is mounted on the base via a support.

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