A large flow carbon graphite floating ring seal leakage detection structure

Abstract

The present invention discloses a large-flow carbon graphite floating ring seal leakage detection structure, comprising: a shell, wherein a hollow accommodating cavity is provided in the shell; a connecting seat with an annular structure, wherein the connecting seat is provided in the accommodating cavity; a shaft sleeve, wherein the shaft sleeve is used to connect a rotating shaft, wherein the shaft sleeve is provided on the inner side of the connecting seat, and wherein the shaft sleeve has two annular structures and axially arranged contact portions; a carbon graphite floating ring sealing device is provided between the contact portions and the connecting seat, and wherein the carbon graphite floating ring sealing device comprises a mounting seat and a graphite floating ring; the mounting seat is connected to the inner side of the connecting seat, wherein the graphite floating ring is provided on the inner side of the mounting seat, and a sealed fitting pair is formed after the graphite floating ring and the contact portion are in surface contact, wherein the graphite floating ring and the contact portion are in sliding fit; a sealed cavity is formed between the two contact portions through the fitting pair; the present invention relates to the field of carbon graphite floating ring seal technology.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon graphite floating ring seals, and more particularly to a leakage detection structure for a large-flow carbon graphite floating ring seal. Background Art

[0002] Carbon-graphite floating ring seals are a sealing technology widely used in high-temperature, high-pressure, and harsh operating conditions, particularly in aerospace, nuclear power, and petrochemical industries. This sealing method, primarily composed of a floating ring made of carbon-graphite, leverages its excellent wear resistance, corrosion resistance, and self-lubricating properties to effectively prevent fluid leakage in high-speed, high-load environments, ensuring safe equipment operation. As modern industry demands ever-increasing equipment performance and operational stability, traditional sealing technologies are struggling to meet these demands in some challenging operating conditions. This is particularly true under harsh conditions such as high and low temperatures, severe corrosion, and high pressure, where traditional sealing materials are susceptible to wear, aging, and leakage. Carbon-graphite floating ring seals, however, offer excellent thermal stability and mechanical strength, enabling long-term, stable operation under these extreme conditions, effectively extending equipment life and efficiency. Furthermore, carbon-graphite floating ring seals offer excellent adaptability and machinability, allowing for customized sealing structures to accommodate diverse operating conditions and various types of rotating machinery and pressure vessels. These seals represent a key development in modern sealing technology. However, due to the particularity of its structure, test simulation of a single device is often difficult to achieve. Therefore, the large-flow carbon graphite floating ring seal simulated leakage detection device of the present invention provides a good solution for the performance test of a single carbon graphite floating ring seal device. Summary of the Invention

[0003] The present invention provides a large-flow carbon graphite floating ring seal leakage detection structure, comprising the following components:

[0004] A large flow carbon graphite floating ring seal leakage detection structure, comprising:

[0005] a housing having a hollow receiving cavity therein;

[0006] A connecting seat of an annular structure, wherein the connecting seat is arranged in the accommodating cavity;

[0007] A shaft sleeve, which is used to connect the rotating shaft and is arranged on the inner side of the connecting seat. The shaft sleeve has two annular structures and axially arranged contact portions;

[0008] A carbon graphite floating ring sealing device is provided between the contact portion and the connecting seat, and the carbon graphite floating ring sealing device includes a mounting seat and a graphite floating ring;

[0009] The mounting seat is connected to the inner side of the connecting seat, the graphite floating ring is arranged on the inner side of the mounting seat, and the graphite floating ring and the contact portion are in surface contact to form a sealed fitting pair, and the graphite floating ring and the contact portion are in sliding fit;

[0010] A sealed cavity is formed between the two contact parts through a matching pair;

[0011] The connecting seat is provided with a flow channel, one end of which is used for the medium to enter, and the other end of which is connected to the sealing cavity through the hole on the mounting seat;

[0012] The accommodating cavity is communicated with a detection flow channel, and the detection flow channel is connected to a flow meter.

[0013] Beneficial effects:

[0014] The present invention has the following advantages:

[0015] Large flow annular cavity structure: simulates the medium channel under actual working conditions and improves test accuracy.

[0016] Internal and external double carbon graphite floating ring mechanical seal device: accurately measure radial leakage.

[0017] “H” type seal “racetrack” design: reduces the moment of inertia and improves the stability of the device.

[0018] High temperature large diameter connector: realize high temperature and large flow medium channel.

[0019] Annular opening elastic element positioning: simplifies the installation process and improves installation accuracy.

[0020] Tandem clamping fixture design: simplifies the design and improves installation convenience and accuracy.

[0021] Annular sector-shaped medium channel opening design: avoids flow interception and improves measurement accuracy.

[0022] As an improvement of the present invention, the shell is a cylindrical structure.

[0023] The accommodating cavity is a stepped hole and is arranged on the inner side of the shell in a front-to-back penetrating manner;

[0024] The connecting seat includes an inner connecting seat and an outer connecting seat, and the inner connecting seat and the outer connecting seat are provided with through holes running through the front and back;

[0025] The outer connecting seat and the inner connecting seat are sequentially installed from the tail end of the stepped hole to the first section of the stepped hole.

[0026] A threaded connector is provided in the through holes of the inner connecting seat and the outer connecting seat, and the threaded connector passes through the through holes and is connected to the connecting hole on the inner wall of the first section of the stepped hole;

[0027] The inner connecting seat is provided with a stopper protruding from the peripheral surface, and the stopper forms a limiting fit with the rear end surface of the shell.

[0028] As an improvement of the present invention, the inlet flow channel is radially penetrated through the outer connecting seat and the inner connecting seat respectively, and the cross section of the inlet flow channel is a fan-shaped structure.

[0029] As an improvement of the present invention, the inner wall of the first section of the stepped hole is radially cut to form an annular air cavity, and the air cavity is arranged around the mouth of the outer end of the flow channel;

[0030] There are multiple converging flow channels, which are arranged in an annular pattern.

[0031] The housing is provided with an adapter connected to the air cavity, and the adapter allows the medium to enter the air cavity.

[0032] As an improvement of the present invention, the tail end of the outer connecting seat and the front end of the inner connecting seat are respectively provided with a notch of an annular structure;

[0033] The mounting seat includes an outer ring and an inner ring. The outer ring is installed in the notch, and the outer end of the outer ring abuts against the side wall of the outer end of the notch. A limiter is provided at the notch to abut against the inner end of the outer ring.

[0034] The inner ring is provided with an assembly groove, and the outer periphery of the graphite floating ring fits into the assembly groove.

[0035] As an improvement of the present invention, the front end of the housing is provided with an outer end cover, and the detection flow channel is connected to the outer end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention.

[0037] Figure 2 The present invention Figure 1 A magnified schematic diagram of the structure in the middle.

[0038] Figure 3 It is a structural schematic diagram of the external connecting seat of the present invention.

[0039] Figure 4 It is a front view structural schematic diagram of the external connecting seat of the present invention.

[0040] Figure 5 The present invention Figure 4 BB-direction cross-sectional structural diagram.

[0041] As shown in the figure: 1. Outer shell; 1.1. Accommodating cavity; 1.11. Air cavity; 1.2. Adapter; 2. Connecting seat; 2.1. Influent channel; 2.2. Inner connecting seat; 2.21. Stopper; 2.3. Outer connecting seat; 3. Bushing; 3.1. Contact part; 3.11. Sealing cavity; 4. Mounting seat; 4.1. Hole body; 4.2. Outer ring; 4.21. Limiting piece; 4.3. Inner ring; 4.31. Assembly groove; 5. Graphite floating ring; 6. Detection channel; 7. Outer end cover; 8. Flow meter; 9. Through hole. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] See also Figure 1-5 As shown, a large flow carbon graphite floating ring 5 seal leakage detection structure includes:

[0044] The housing 1 has a hollow receiving chamber 1.1 disposed therein;

[0045] A connecting seat 2 of an annular structure is disposed in the accommodating cavity 1.1;

[0046] The shaft sleeve 3 is used to connect the rotating shaft. The shaft sleeve 3 is arranged on the inner side of the connecting seat 2. The shaft sleeve 3 has two annular structures and axially arranged contact parts 3.1;

[0047] A carbon graphite floating ring sealing device is provided between the contact portion 3.1 and the connecting seat 2. The carbon graphite floating ring sealing device includes a mounting seat 4 and a graphite floating ring 5.

[0048] The mounting seat 4 is connected to the inner side of the connecting seat 2. The graphite floating ring 5 is arranged on the inner side of the mounting seat 4. The graphite floating ring 5 and the contact portion 3.1 are in surface contact to form a sealed fitting pair. The graphite floating ring 5 and the contact portion 3.1 are in sliding fit.

[0049] A sealed cavity 3.11 is formed between the two contact parts 3.1 through a mating pair;

[0050] The connecting seat 2 is provided with a flow channel, one end of which is used for the medium to enter, and the other end is connected to the sealing cavity 3.11 through the hole 4.1 on the mounting seat 4;

[0051] The accommodating chamber 1.1 is connected to a detection flow channel 6, and the detection flow channel 6 is connected to a flow meter 8.

[0052] The shaft can be driven by a motor to rotate and simulate the speed condition;

[0053] During testing, a medium (such as gas) is introduced from one end of the flow channel. The medium passes through the flow channel and the hole 4.1 on the mounting seat 4 and enters the sealed cavity 3.11 and gathers in the sealed cavity 3.11.

[0054] There is a tiny gap between the carbon graphite floating ring 5 and the contact portion 3.1, forming a leakage channel. The medium leaks from the leakage channel and enters the accommodating chamber 1.1. The detection flow channel 6 connected to the accommodating chamber 1.1 is provided with a flow meter 8, which can measure the flow change, that is, the sealed gas leakage flow rate.

[0055] The leaked gas leaks from the sealed leakage channel. As the channel becomes smaller, the medium will be intercepted and generate pressure. By adjusting the flow rate of the incoming medium, the pressure in the cavity can be adjusted to meet the working conditions of the detection.

[0056] As an improvement of the present invention, the housing 1 is a cylindrical structure.

[0057] The accommodating cavity 1.1 is a stepped hole and is arranged on the inner side of the housing 1 in a front-to-back manner. The stepped hole has a first section and a second section. The first section is located at the end of the second section, and the diameter of the first section is larger than the diameter of the second section.

[0058] The connecting seat 2 includes an inner connecting seat 2.2 and an outer connecting seat 2.3. Each inner connecting seat 2.2 and outer connecting seat 2.3 is provided with a through hole 9 extending from front to back. A reserved body is provided on the inner connecting seat 2.2 or outer connecting seat 2.3 between adjacent inlet flow channels 2.1. The through hole 9 extends through the remaining body. The through hole 9 is structurally isolated from the inlet flow channel 2.1 to prevent the medium in the inlet flow channel 2.1 from leaking through the through hole 9.

[0059] The outer connecting seat 2.3 and the inner connecting seat 2.2 are sequentially installed from the rear end of the stepped hole to the first section of the stepped hole. Threaded connectors are inserted into the through holes 9 of the inner connecting seat 2.2 and the outer connecting seat 2.3, and the threaded connectors pass through the through holes 9 and connect with the connecting holes on the inner wall of the first section of the stepped hole.

[0060] The inner connecting seat 2.2 is provided with a stopper 2.21 protruding from the peripheral surface, and the stopper 2.21 forms a limiting fit with the rear end surface of the outer shell 1.

[0061] There are multiple through holes 9, which are arranged at intervals in a ring shape. The threaded connector inserted into the through hole 9 is connected to the connecting hole to fix the inner connecting seat 2.2 and the outer connecting seat 2.3.

[0062] The stopper 2.21 and the rear end surface of the housing 1 form a limiting cooperation to ensure that the inner connecting seat 2.2 and the outer connecting seat 2.3 are accurately assembled in the preset assembly position;

[0063] The above-mentioned series clamping design: simplifies the design and improves the convenience and accuracy of installation.

[0064] The front end wall of the external connecting seat 2.3 and the wall of the first section of the stepped hole are sealed;

[0065] The front end wall of the stopper 2.21 is sealed with the rear end wall of the housing 1;

[0066] The front end wall surface of the inner connecting seat 2.2 and the rear end surface of the outer connection are sealed.

[0067] After the above improvements, the sealing performance is improved and the test results are accurate and reliable.

[0068] As an improvement of the present invention, the inlet flow channel 2.1 is radially penetrated on the outer connecting seat 2.3 and the inner connecting seat 2.2 respectively, and the cross section of the inlet flow channel 2.1 is a fan-shaped structure.

[0069] After the above improvements, the flow rate can be increased, so that the medium can be quickly and continuously accumulated in the sealed cavity 3.11.

[0070] As an improvement of the present invention, the inner wall of the first section of the stepped hole is radially cut to form an annular air cavity 1.11, and the air cavity 1.11 is arranged around the mouth of the outer end of the flow channel 2.1;

[0071] There are multiple inflow channels 2.1, which are arranged in an annular pattern.

[0072] The housing 1 is provided with an adapter 1.2 communicating with the air cavity 1.11, and the adapter 1.2 allows the medium to enter the air cavity 1.11.

[0073] After the above improvement, multiple flow channels are provided inside the annular air cavity 1.11, which enables the medium to quickly enter the air cavity 1.11 and quickly gather in the sealed cavity 3.11 through the flow channels.

[0074] As an improvement of the present invention, the tail end of the outer connecting seat 2.3 and the front end of the inner connecting seat 2.2 are respectively provided with a notch of an annular structure;

[0075] The mounting seat 4 includes an outer ring 4.2 and an inner ring 4.3. The outer ring 4.2 is inserted into the notch, and the outer end of the outer ring 4.2 abuts against the side wall of the outer end of the notch. A stopper 4.21 is provided at the notch to abut against the inner end of the outer ring 4.2.

[0076] The inner ring 4.3 is provided with an assembly groove 4.31, and the outer periphery of the graphite floating ring 5 fits into the assembly groove 4.31.

[0077] The front end of the inner connector 2.2 and the rear end of the outer connector 2.3 are each provided with a retaining groove. A retaining member 4.21 can be inserted into the retaining groove to abut against the inner end of the outer ring 4.2, thereby positioning and installing the carbon-graphite floating ring 5 mechanical seal. This prevents movement of the carbon-graphite floating ring seal and secures it in its designed installation position. Compared to traditional screw-based retaining block methods, this method reduces the number of parts used, further optimizes the installation process, and provides intuitive verification of proper installation.

[0078] As an improvement of the present invention, an outer end cover 7 is provided at the front end of the housing 1 , and the detection flow channel 6 is connected to the outer end cover 7 .

[0079] The inlet of the detection flow channel 6 is located at the center of the outer end cover 7 and is equidistant from each leakage channel on the peripheral surface of the contact portion 3.1, so that the structural layout is reasonable and the detection result is accurate and reliable.

[0080] The present invention has the following advantages:

[0081] First, the present invention features a structure with multiple high-flow annular cavities for media flow, as well as an annular air cavity 1.11 that connects to the seal cavity 3.11. Conventional test fixtures for carbon-graphite floating ring 5 mechanical seals often only have a single through-hole on the fixture connected to a pipeline for media inflow. This fails to simulate the annular air inflow path experienced by the carbon-graphite floating ring 5 mechanical seal under actual operating conditions, resulting in an inability to simulate the specific leakage of the carbon-graphite floating ring 5 mechanical seal during testing, leading to design issues. However, the high-flow annular cavity design allows the air fluid to first flow through the annular cavity before entering the working surface of the carbon-graphite floating ring 5 mechanical seal, and then circumferentially enter the actual sealing surface, achieving experimental simulation of circumferential annular air inflow.

[0082] Second, the present invention employed a test simulation during the design process using a symmetrically mounted inner and outer dual carbon graphite floating ring (5) mechanical seal. The dual seal simulation was designed primarily to accurately measure radial leakage from the outer dual carbon graphite floating ring (5) mechanical seal. Because this seal exhibits high radial leakage and a small pressure differential between the inner and outer sides in actual operating conditions, accurately controlling the operating parameters during the test simulation is difficult. By symmetrically arranging two sets of seals, both on the inner and outer sides, the medium cannot be directly vented from the inside, resulting in no pressure differential. This design allows a pressure differential to be generated between the inner and outer working channels of a single carbon graphite floating ring (5) mechanical seal, simulating the sealing medium pressure differential experienced in actual operating conditions. Accurate simulated measurements can be achieved on the test bench by adjusting the inlet gas flow rate.

[0083] Third, the contact portion 3.1 serves as the rotating counterpart, forming an "H"-shaped racetrack design. Taking into account the position of the carbon graphite rings after the installation of the inner and outer carbon-graphite floating rings 5 ​​mechanical seal, the "H"-shaped sleeve 3 is designed so that the two high points of the "H" (the circumference of the contact portion 3.1) align with the graphite rings, forming a sealed pair. This structural design not only ensures the proper sealing pair, but also reduces the overall weight of the rotating component, lowering its moment of inertia and belt weight. The use of rounded corners avoids stress concentration in the components, ensuring more stable operation. A rectangular protrusion is also designed on the outside to facilitate clamping during installation.

[0084] Fourth, the present invention utilizes a tandem clamping fixture design, specifically, the inner connector 2.2, outer connector 2.3, and accommodating chamber 1.1 are installed in series. This reduces the need for fixtures to accurately position the installation, ensuring the precise alignment of the H-shaped seal "track" and the carbon-graphite sealing assembly. Furthermore, because the two outer carbon-graphite floating rings 5 ​​are directly positioned and mounted on the inner connector 2.2 and outer connector chamber, respectively, this simplifies the design while significantly improving the convenience and accuracy of fixture installation. Compared to traditional fixtures, this eliminates the need for repeated measurements during component installation. While ensuring correct installation, the present invention's tandem clamping fixture design directly guarantees accurate installation.

[0085] Fifth, the present invention utilizes an annular fan-shaped inlet flow channel 2.1, creating corresponding annular fan-shaped openings on the inner connecting seat 2.2 and the outer connecting seat 2.3 corresponding to the circumferential hole body 4.1 of the carbon-graphite sealing device to form a circumferential medium channel. Compared to the traditional single medium hole design, the design of the present invention allows the medium to enter the sealing device through the annular fan-shaped channel, making the simulation more realistic. At the same time, because the design of a single medium hole is prone to flow interception due to the size of the aperture, resulting in an underestimation of the seal leakage measurement, the use of an annular fan-shaped medium channel design greatly increases the cross-section of the medium channel, eliminates the interception effect, and makes the measurement more accurate.

[0086] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. A large flow carbon graphite floating ring seal leakage detection structure, characterized in that: include: A housing (1), wherein a hollow accommodating cavity (1.1) is provided in the housing (1); A connecting seat (2) of an annular structure, wherein the connecting seat (2) is arranged in the accommodating cavity (1.1); A shaft sleeve (3), the shaft sleeve (3) is used to connect the rotating shaft, the shaft sleeve (3) is arranged on the inner side of the connecting seat (2), and the shaft sleeve (3) has two annular structures and axially arranged contact portions (3.1); A carbon graphite floating ring sealing device is provided between the contact portion (3.1) and the connecting seat (2), and the carbon graphite floating ring sealing device comprises a mounting seat (4) and a graphite floating ring (5); The mounting seat (4) is connected to the inner side of the connecting seat (2), the graphite floating ring (5) is arranged on the inner side of the mounting seat (4), and the graphite floating ring (5) and the contact portion (3.1) are in surface contact to form a sealed fitting pair, and the graphite floating ring (5) and the contact portion (3.1) are in sliding fit; A sealed cavity (3.11) is formed between the two contact portions (3.1) through a matching pair; The connecting seat (2) is provided with an inlet flow channel (2.1), one end of the inlet flow channel (2.1) is used for the medium to enter, and the other end is connected to the sealing cavity (3.11) through the hole (4.1) on the mounting seat (4); The accommodating cavity (1.1) is connected to a detection flow channel (6), and the detection flow channel (6) is connected to a flow meter (8).

2. A large flow carbon graphite floating ring seal leakage detection structure according to claim 1, characterized in that: The housing (1) is a cylindrical structure. The accommodating cavity (1.1) is a stepped hole and is arranged on the inner side of the housing (1) in a manner penetrating from front to back; The connecting seat (2) comprises an inner connecting seat (2.2) and an outer connecting seat (2.3), and the inner connecting seat (2.2) and the outer connecting seat (2.3) are provided with through holes (9) penetrating front and back; The outer connecting seat (2.3) and the inner connecting seat (2.2) are sequentially installed from the tail end of the stepped hole to the first section of the stepped hole. A threaded connector is provided in the through hole (9) of the inner connecting seat (2.2) and the outer connecting seat (2.3), and the threaded connector passes through the through hole (9) and is connected to the connecting hole on the inner wall of the first section of the stepped hole; The inner connecting seat (2.2) is provided with a stopper (2.21) protruding from the peripheral surface, and the stopper (2.21) forms a limiting fit with the rear end surface of the outer shell (1).

3. A large flow carbon graphite floating ring seal leakage detection structure according to claim 2, characterized in that: The inlet flow channel (2.1) is radially penetrated on the outer connecting seat (2.3) and the inner connecting seat (2.2), respectively, and the cross section of the inlet flow channel (2.1) is a fan-shaped structure.

4. A large flow carbon graphite floating ring seal leakage detection structure according to claim 3, characterized in that: The inner wall of the first section of the stepped hole is radially cut to form an annular air cavity (1.11), and the air cavity (1.11) is arranged around the mouth of the outer end of the flow channel (2.1); There are a plurality of the converging flow channels (2.1), which are arranged in an annular manner; The housing (1) is provided with an adapter (1.2) in communication with the air cavity (1.11), and the adapter (1.2) allows the medium to enter the air cavity (1.11).

5. A large flow carbon graphite floating ring seal leakage detection structure according to claim 2, characterized in that: The tail end of the outer connecting seat (2.3) and the front end of the inner connecting seat (2.2) are respectively provided with a notch of an annular structure; The mounting seat (4) comprises an outer ring (4.2) and an inner ring (4.3); the outer ring (4.2) is inserted into the notch, the outer end of the outer ring (4.2) abuts against the side wall of the outer end of the notch, and a limiting member (4.21) is provided at the notch to abut against the inner end of the outer ring (4.2); The inner ring (4.3) is provided with an assembly groove (4.31), and the outer periphery of the graphite floating ring (5) fits into the assembly groove (4.31).

6. A large flow carbon graphite floating ring seal leakage detection structure according to claim 2, characterized in that: An outer end cover (7) is provided at the front end of the housing (1), and the outer end cover (7) and the detection flow channel (6) are connected to the outer end cover (7).

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