Large-flow carbon graphite floating ring seal leakage rate detection structure

Abstract

The invention discloses a large-flow carbon-graphite floating ring seal leakage rate detection structure, and the structure comprises a housing which is internally provided with a hollow accommodation cavity; the connecting seat is of an annular structure, and the connecting seat is arranged in the containing cavity; the shaft sleeve is used for being connected with a rotating shaft, the shaft sleeve is arranged on the inner side of the connecting seat, and the shaft sleeve is provided with two contact parts which are of an annular structure and are axially arranged; a carbon graphite floating ring sealing device is arranged between the contact part and the connecting seat and comprises a mounting seat and a graphite floating ring; 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, the graphite floating ring is in surface contact with the contact part to form a sealed matching pair, and the graphite floating ring is in sliding fit with the contact part; a sealing cavity is formed between the two contact parts through a matching pair; the invention relates to the technical field of carbon graphite floating ring sealing.

Description

Technical Field

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

[0002] Carbon graphite floating ring seal is a sealing technology widely used in high temperature, high pressure and harsh working conditions, especially in aerospace, nuclear power, petrochemical and other fields. This sealing method is mainly composed of floating rings made of carbon graphite materials. With its excellent wear resistance, corrosion resistance and self-lubricating properties, it can effectively prevent fluid leakage in high-speed rotation and high-load environments to ensure the safe operation of equipment. With the continuous improvement of modern industry's requirements for equipment performance and operating stability, traditional sealing technology has been difficult to meet the needs under some special working conditions, especially under harsh conditions such as high temperature, low temperature, strong corrosion and high pressure, traditional sealing materials are prone to wear, aging or leakage. Carbon graphite floating ring seals, with their excellent thermal stability and mechanical strength, can work stably for a long time under extreme conditions, thereby effectively improving the service life and operating efficiency of equipment. In addition, carbon graphite floating ring seals also have good adaptability and processability, can customize sealing structures according to different working conditions, and adapt to various types of rotating machinery and pressure vessels. It is an important development direction in the field of modern sealing technology. However, due to the particularity of its structure, test simulation of a single device is often difficult to achieve. Therefore, a 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 shell having a hollow accommodating cavity disposed therein;

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

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

[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 comprises 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 forms a sealed matching pair after the surface contact with the contact part, and the graphite floating ring and the contact part are slidably matched;

[0010] A sealing 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 with the sealing cavity through the hole body on the mounting seat;

[0012] The accommodating cavity is communicated with a detection flow channel, and the detection flow channel is connected with 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 tooling design: simplifies the design and improves installation convenience and accuracy.

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

[0022] As an improvement of the present invention, the housing 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 comprises an inner connecting seat and an outer connecting seat, and the inner connecting seat and the outer connecting seat are provided with through holes penetrating 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 inserted into 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 a 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 outer shell.

[0028] As an improvement of the present invention, the inlet flow channel is respectively arranged to penetrate the outer connecting seat and the inner connecting seat in the radial direction, and the cross section of the inlet flow channel is arranged in a fan-shaped structure.

[0029] As an improvement of the present invention, the first section of the inner wall 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 a plurality of converging flow channels, which are arranged in annular intervals.

[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 comprises an outer ring and an inner ring, the outer ring is inserted into the notch, the outer end of the outer ring abuts against the side wall of the outer end of the notch, and a stopper is arranged 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 circumference of the graphite floating ring fits in the assembly groove.

[0035] As an improvement of the present invention, an outer end cover is provided at the front end of the shell, and the outer end cover and the detection flow channel are 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 schematic diagram of the enlarged structure in the middle.

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

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

[0040] Figure 5 The present invention Figure 4 BB section structure schematic diagram.

[0041] As shown in the figure: 1. Shell; 1.1. Accommodating cavity; 1.11. Air cavity; 1.2. Adapter; 2. Connecting seat; 2.1. Inlet flow 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 flow channel; 7. Outer end cover; 8. Flow meter; 9. Through hole. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with 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] A housing 1, wherein a hollow receiving chamber 1.1 is provided in the housing 1;

[0045] A connecting seat 2 of an annular structure, the connecting seat 2 being arranged 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 contact parts 3.1 of annular structure and arranged axially;

[0047] A carbon graphite floating ring 5 sealing device is provided between the contact portion 3.1 and the connecting seat 2, and the carbon graphite floating ring 5 sealing device comprises 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, and the graphite floating ring 5 is arranged on the inner side of the mounting seat 4. The graphite floating ring 5 and the contact part 3.1 are in surface contact to form a sealed matching pair, and the graphite floating ring 5 and the contact part 3.1 are in sliding fit.

[0049] A sealing cavity 3.11 is formed between the two contact parts 3.1 through a matching 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 of which 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] When testing, a medium (such as gas) is introduced from one end of the flow channel, and the medium enters the sealed cavity 3.11 through the flow channel and the hole 4.1 on the mounting seat 4 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, which forms 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 is measured.

[0055] The leaking 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 required for 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 inside the housing 1 in a front-to-back penetrating manner; the stepped hole has a first section and a second section, the first section is located at the tail end of the second section, and the diameter of the first section is greater than the diameter of the second section;

[0058] The connection seat 2 includes an inner connection seat 2.2 and an outer connection seat 2.3. The inner connection seat 2.2 and the outer connection seat 2.3 are provided with a through hole 9 that penetrates from front to back. The inner connection seat 2.2 or the outer connection seat 2.3 between adjacent inlet flow channels 2.1 has a reserved body. The through hole 9 penetrates the remaining body. The through hole 9 is isolated from the inlet flow channel 2.1 by a structural design to prevent the medium in the inlet flow channel 2.1 from leaking from the through hole 9.

[0059] The outer connection seat 2.3 and the inner connection seat 2.2 are sequentially installed from the tail end of the stepped hole to the first section of the stepped hole, and threaded connectors are inserted into the through holes 9 of the inner connection seat 2.2 and the outer connection seat 2.3, and the threaded connectors pass through the through holes 9 and are connected to the connection 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 in an annular manner and at intervals. After the threaded connectors inserted into the through holes 9 are connected to the connecting holes, the inner connecting seat 2.2 and the outer connecting seat 2.3 can be fixed;

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

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

[0064] Sealing treatment of the front end wall surface of the external connection seat 2.3 and the wall surface of the first section of the stepped hole;

[0065] The front end wall surface of the stopper 2.21 and the rear end wall surface of the housing 1 are sealed;

[0066] The front end wall surface of the inner connection 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 respectively arranged to penetrate the outer connecting seat 2.3 and the inner connecting seat 2.2 in the radial direction, and the cross section of the inlet flow channel 2.1 is arranged in a fan-shaped structure.

[0069] After the above improvements, the flow rate can be increased, so that the medium can be quickly and continuously gathered in the sealing chamber 3.11.

[0070] As an improvement of the present invention, the first section of the inner wall 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 annular intervals.

[0072] The housing 1 is provided with an adapter 1.2 which is in communication 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 sealing 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 comprises 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 connecting seat 2.2 and the rear end of the outer connecting seat 2.3 are respectively provided with a card slot, and the limiter 4.21 can be inserted into the card slot to abut against the inner end of the outer ring 4.2, so that the carbon graphite floating ring 5 mechanical sealing device can be positioned and installed. In this way, the movement of the carbon graphite floating ring 5 sealing device is avoided, and the carbon graphite floating ring 5 sealing device is fixed in the designed installation position. Compared with the traditional fixing method of the screw positioning block, the present invention uses this method, reduces the number of parts used, further optimizes the installation steps, simplifies the installation process, and can intuitively see whether it is installed in place.

[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 the distance from each leakage channel on the peripheral surface of the contact part 3.1 is equal, 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 designs a medium flow structure of multiple large-flow annular cavities, and the air cavity 1.11 of the annular structure is used to connect the sealing cavity 3.11. In the design of the test bench test tooling of the traditional carbon graphite floating ring 5 mechanical seal, the medium inflow channel often only has a single through hole connected to the pipeline on the tooling, which cannot simulate the medium channel of the annular air intake of the carbon graphite floating ring 5 mechanical seal in actual working conditions, resulting in the inability to actually simulate the specific leakage of the carbon graphite floating ring 5 mechanical seal during the test process, resulting in design problems. However, the large-flow annular cavity structure design is adopted. Through the designed annular cavity, the air fluid medium first flows through the annular cavity before entering the working surface of the carbon graphite floating ring 5 mechanical seal, and then enters the actual sealing surface from the circumferential direction, realizing the test simulation of the circumferential annular air intake.

[0082] Second, the present invention uses a test simulation of symmetrically installed inner and outer double carbon graphite floating ring 5 mechanical seals during the design process. The design uses a double sealing device simulation mainly to accurately measure the radial leakage of the outer double carbon graphite floating ring 5 mechanical seal. Since the radial leakage of the sealing device is large and the pressure difference between the inside and outside is small in actual working conditions, it is difficult to accurately control the working condition parameters of the test simulation. By symmetrically arranging two sets of sealing devices on the inside and outside at the same time, the medium cannot be directly vented from the inside, resulting in the inability to form a pressure difference. This design can form a pressure difference between the inside and outside of the working channel of a single set of carbon graphite floating ring 5 mechanical seals, simulating the sealing medium pressure difference in actual working conditions, and achieving accurate simulation measurement on the test bench by adjusting the inlet gas flow.

[0083] Third, the contact part 3.1 is used as a rotating matching part to form an "H"-shaped runway design. Combined with the position of the carbon ring graphite after the installation of the two sets of carbon graphite floating rings 5 ​​mechanical seals, the "H"-shaped sleeve 3 is designed so that the two high points of the "H" shape (the circumference of the contact part 3.1) are exactly matched with the graphite ring position to form a sealing matching pair. Through such a structural design, while meeting the matching of the sealing matching pair, combined with the "H"-shaped structure, the weight of the overall rotating part is reduced, the moment of inertia and the belt rotation weight are reduced; at the same time, the arc transition sharp corners are used to avoid stress concentration of the parts, making the overall device run more stably. At the same time, a quadrilateral protrusion is designed on the outside to facilitate clamping during installation.

[0084] Fourth, the present invention uses a serial clamping tool design, that is, the inner connecting seat 2.2, the outer connecting seat 2.3 and the accommodating chamber 1.1 are installed in series, and less tooling is used to locate the installation position, ensuring the accurate positioning of the "H"-shaped sealing "track" and the carbon graphite sealing device working pair. At the same time, because the two outer sets of carbon graphite floating rings 5 ​​mechanical sealing devices are directly positioned and installed on the inner connecting seat 2.2 and the outer connecting chamber, respectively, the design is simplified while greatly improving the convenience and accuracy of tooling installation. Compared with traditional tooling, the repetitive labor of repeated measurements during the installation of parts is avoided. While ensuring the correct installation, the serial clamping tool design of the present invention directly guarantees the accuracy of the installation position.

[0085] Fifth, the present invention uses the design of an annular fan-shaped inlet flow channel 2.1, and opens corresponding annular fan-shaped holes 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 with the traditional single medium hole design, the design of the present invention can allow the medium to enter the sealing device through the annular fan-shaped channel, making the simulation more in line with the actual medium entry method; 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 a smaller measurement of the seal leakage, the use of an annular fan-shaped medium channel opening design greatly increases the cross-section of the medium channel, does not produce interception effect, and makes the measurement more accurate.

[0086] The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope 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 chamber (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) being used to connect the rotating shaft, the shaft sleeve (3) being arranged on the inner side of the connecting seat (2), the shaft sleeve (3) having two contact portions (3.1) of annular structure and arranged axially; A carbon graphite floating ring (5) sealing device is provided between the contact portion (3.1) and the connecting seat (2), and the carbon graphite floating ring (5) 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 part (3.1) are in surface contact to form a sealed matching pair, and the graphite floating ring (5) and the contact part (3.1) are in sliding fit; A sealing cavity (3.11) is formed between the two contact parts (3.1) through a matching pair; The connection seat (2) is provided with an inlet flow channel (2.1), one end of which is used for the medium to enter, and the other end of which is connected to the sealing cavity (3.11) through a hole (4.1) on the mounting seat (4); 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).

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 rear; 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. A threaded connector is inserted into 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 a connecting hole on the inner wall of the first section of the stepped hole; The inner connection 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 respectively arranged to penetrate the outer connection seat (2.3) and the inner connection seat (2.2) in the radial direction, 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 first section of the inner wall 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); The number of the confluence channels (2.1) is plural and they are arranged in annular intervals; The housing (1) is provided with an adapter (1.2) which is 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 stopper (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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