Double-row end face flexible diaphragm box type autonomous regulation and control sealing device suitable for multi-rotor linkage

Abstract

The invention discloses a double-row end face flexible diaphragm box type autonomous regulation and control sealing device suitable for multi-rotor linkage, which comprises a shell assembly, a sealing assembly and a sealing assembly, the rotor assembly at least comprises two rotors which can rotate independently and are of hollow structures, the at least two rotors are arranged in an inner and outer sleeving mode, and media can enter the hollow structures of the rotors; the sealing assembly is arranged between the axial end face of the rotor and the static ring so that the middle structure of the rotor can be sealed and isolated. The sealing assembly comprises a mounting ring, a flexible diaphragm capsule unit and a graphite ring; the mounting ring is connected to the axial end surface of the rotor; the flexible diaphragm capsule unit and the graphite ring are arranged on the inner side of the mounting ring, and the flexible diaphragm capsule unit, the graphite ring and the mounting ring are in linkage rotation with the rotor; the static ring surfaces of the graphite rings are in contact fit to form a friction sealing pair; the invention relates to the technical field of turbine equipment sealing.

Description

Technical Field

[0001] The invention relates to the technical field of turbine equipment sealing, and more specifically to a double-row end-face flexible diaphragm box type self-regulating sealing device suitable for multi-rotor linkage. Background Art

[0002] The use scenarios of existing turbine equipment generally have the characteristics of high temperature and high debris. The sealing structures of turbine rotors are as follows: 1. The end face mechanical seal generally includes a main seal joint, which includes two relatively rotatable sealing surfaces. Friction and wear between the sealing surfaces can cause a gap to form between them, resulting in excessive leakage.

[0003] Therefore, some face seals require periodic adjustment to maintain the proper or axial position (also referred to as "seal height") of the axially displaceable seal component in order to account for this wear.

[0004] 2. The push seal assembly includes a dynamic secondary seal (such as an O-ring) to provide a seal between the shaft and the seal component itself. The dynamic secondary seal of the push seal is generally configured to move axially with the axially displaceable seal. This axial movement relative to the shaft can cause wear or tear of the secondary seal due to friction.

[0005] The above-mentioned sealing structure is usually complicated and not suitable for use on multi-rotor turbine equipment. Moreover, when used in harsh environments, the probability of failure is high. Summary of the invention

[0006] In view of the shortcomings and defects of the prior art, a double-row end-face flexible diaphragm box-type autonomous regulating sealing device which can realize dynamic and static sealing of multiple rotors and is independent of each other and does not interfere with each other and is adaptable to the linkage of multiple rotors is provided.

[0007] A double-row end-face flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage, comprising:

[0008] a housing assembly, the housing assembly being provided with a stationary ring;

[0009] A rotor assembly, wherein the rotor assembly comprises at least two independently rotatable rotors with hollow structures, and at least two rotors are arranged in an inner and outer arrangement, and the hollow structures of the rotors are accessible to the medium;

[0010] A sealing assembly, the sealing assembly being arranged between the axial end surface of the rotor and the stationary ring to seal and isolate the intermediate structure of the rotor;

[0011] The sealing assembly comprises a mounting ring, a flexible diaphragm unit and a graphite ring;

[0012] The mounting ring is connected to the axial end surface of the rotor;

[0013] The flexible membrane box unit and the graphite ring are arranged on the inner side of the mounting ring, and the flexible membrane box unit, the graphite ring and the mounting ring rotate in conjunction with the rotor;

[0014] The stationary ring surface of the graphite ring is in contact with each other to form a friction seal pair, the flexible diaphragm box unit is connected between the graphite ring and the axial end surface of the rotor, and the flexible diaphragm box unit and the graphite ring and the axial end surface are sealed respectively;

[0015] The flexible bellows unit applies an axial compensation force to the graphite ring so that the graphite ring maintains effective contact with the stationary ring.

[0016] After adopting the above structure, the double-row end surface flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage of the present invention has the following advantages compared with the prior art:

[0017] A plurality of hollow rotors are arranged in an inner and outer arrangement, and each rotor can rotate independently;

[0018] A sealing assembly is respectively arranged between the shaft end face of each rotor and the stationary ring, and the overall size of the outer sealing assembly is larger than that of the inner sealing assembly, so as to realize a double-row sleeve arrangement similar to the rotor;

[0019] Wherein, the stationary ring is fixed to the housing and is in a stationary state relative to the ground;

[0020] The sliding sealing friction pair between the graphite ring and the stationary ring,

[0021] In working state, the inner rotor and the outer rotor divide the device into three groups of cylindrical spaces radially: outer, middle and inner. Each space is filled with liquid and gas media of different pressures, temperatures and types, and is effectively isolated and sealed through double-row sealing devices. The inner and outer rotors work independently, and different speeds and directions are allowed at the same time. The inner and outer row rotor seals rotate with the corresponding rotors to achieve dynamic and static sealing, which are independent and non-interfering.

[0022] The flexible diaphragm box applies axial compensation force to the graphite ring to keep the graphite ring in effective contact with the stationary ring, provide axial compensation force for the seal in the working state, ensure that the friction pair can fit effectively, prevent medium leakage, and make the device run stably and reliably.

[0023] As an improvement of the present invention, the housing assembly is provided with an accommodating space, the rotor assembly is arranged in the accommodating space, and a gap is formed between the outer rotor and the inner wall of the accommodating space.

[0024] As an improvement of the present invention, the stationary ring is detachably connected to the rear end wall of the accommodating space;

[0025] The protruding end surface of the stationary ring is provided with a contact portion of an annular structure, and the front end surface of the contact portion is in contact with the rear end surface of the graphite ring.

[0026] As an improvement of the present invention, the flexible membrane box unit includes a welding seat, an inlay ring, and a plurality of groups of elastic annular membranes;

[0027] The welding seat is located on the inner side of the mounting ring and is connected to the axial end surface of the rotor;

[0028] The insert ring is axially movably connected to the inner side of the mounting ring, and a receiving groove is provided at the rear end of the insert ring, and the graphite ring is fittedly connected in the receiving groove;

[0029] A plurality of groups of elastic annular diaphragms are welded and stacked in the axial direction, and the annular diaphragms at the front end are welded to the welding seat, and the annular diaphragms at the rear end are welded to the front end of the embedded ring.

[0030] As an improvement of the present invention, an axially extending sliding groove is provided on the inner side of the mounting ring;

[0031] A sliding block is arranged on the outer side of the embedding ring, and the sliding block cooperates with the sliding groove so that the embedding ring can move axially.

[0032] As an improvement of the present invention, the tail end of the graphite ring is radially cut.

[0033] As an improvement of the present invention, sealing rings are respectively arranged between the front end of the welding seat and the axial end surface of the rotor, and between the rear end of the stationary ring and the wall surface of the accommodating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention.

[0035] Figure 2 It is a cross-sectional structural schematic diagram of the present invention.

[0036] Figure 3 The present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0037] Figure 4 It is a schematic diagram of some parts of the present invention in an exploded state.

[0038] Figure 5 It is a schematic diagram of the structure of the sealing assembly of the present invention when the parts are in an exploded state.

[0039] As shown in the figure: 1. Shell assembly; 1.1. Accommodating space; 2. Stationary ring; 2.1. Contact part; 3. Rotor; 3.1. Axial end face; 4. Mounting ring; 4.1. Slide groove; 5. Flexible diaphragm box unit; 5.1. Welding seat; 5.2. Inlaid ring; 5.21. Accommodating groove; 5.22. Slider; 5.3. Annular diaphragm; 6. Graphite ring; 7. Sealing ring. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] See also Figure 1-5 As shown, a double-row end surface flexible membrane box type self-regulating sealing device suitable for multi-rotor 3 linkage includes:

[0042] A housing component 1, wherein the housing component 1 is provided with a stationary ring 2;

[0043] A rotor 3 assembly, the rotor 3 assembly includes at least two independently rotatable hollow rotors 3, and at least two rotors 3 are arranged in an inner and outer arrangement, and the hollow structure of the rotor 3 allows the medium to enter;

[0044] A sealing assembly, which is arranged between the axial end face 3.1 of the rotor 3 and the stationary ring 2 to seal and isolate the intermediate structure of the rotor 3;

[0045] The sealing assembly includes a mounting ring 4, a flexible diaphragm unit 5 and a graphite ring 6;

[0046] The mounting ring 4 is connected to the axial end surface 3.1 of the rotor 3;

[0047] The flexible diaphragm unit 5 and the graphite ring 6 are arranged on the inner side of the mounting ring 4, and the flexible diaphragm unit 5, the graphite ring 6 and the mounting ring 4 rotate in conjunction with the rotor 3;

[0048] The graphite ring 6 and the stationary ring 2 are in surface contact with each other to form a friction seal pair. The flexible diaphragm unit 5 is connected between the graphite ring 6 and the axial end face 3.1 of the rotor 3, and the flexible diaphragm unit 5 and the graphite ring 6 and the axial end face 3.1 are sealed respectively.

[0049] The flexible bellows unit 5 applies an axial compensation force to the graphite ring 6 so that the graphite ring 6 maintains effective contact with the stationary ring 2 .

[0050] After adopting the above structure, the double-row end surface flexible diaphragm box type self-regulating sealing device suitable for multi-rotor 3 linkage of the present invention has the following advantages compared with the prior art:

[0051] A plurality of hollow rotors 3 are arranged in an inner and outer arrangement, and each rotor 3 can rotate independently;

[0052] A sealing assembly is respectively arranged between the axial end surface of each rotor 3 and the stationary ring 2, and the overall size of the outer sealing assembly is larger than that of the inner sealing assembly, so as to realize a double-row sleeve arrangement similar to the rotor 3;

[0053] The high-hardness stationary ring 2 is fixed to the housing and is in a stationary state relative to the ground;

[0054] The sliding sealing friction pair between the graphite ring 6 and the stationary ring 2,

[0055] In the working state, the inner rotor 3 and the outer rotor 3 divide the device into three groups of cylindrical spaces, outer, middle and inner, along the radial direction. Each space is filled with liquid and gas media of different pressures, temperatures and types, and is effectively isolated and sealed through a double-row sealing device. The inner and outer rotors 3 work independently, and different speeds and directions are allowed at the same time. The seals of the inner and outer rows of rotors 3 rotate with the corresponding rotors 3, realizing dynamic and static sealing that are independent of each other and do not interfere with each other.

[0056] The flexible diaphragm box applies an axial compensation force to the graphite ring 6 to keep the graphite ring 6 in effective contact with the stationary ring 2, providing axial compensation force for the seal in the working state. Even if the graphite ring 6 is worn out during long-term use, a reliable friction pair can be formed between the graphite ring 6 and the stationary ring 2 under the action of the axial compensation force, and effective fit can be maintained to prevent medium leakage, so that the device can operate stably and reliably and have a long service life.

[0057] As an improvement of the present invention, the housing assembly 1 is provided with an accommodating space 1.1, the rotor 3 assembly is arranged in the accommodating space 1.1, and a gap is formed between the outer rotor 3 and the inner wall of the accommodating space 1.1.

[0058] After the above improvements, the device as a whole is placed in the accommodating space 1.1 of the housing assembly 1, and the accommodating space 1.1 is relatively closed, effectively isolating external debris from entering the accommodating space 1.1, so that the device is in a relatively closed space, further improving the reliability of the device operation;

[0059] A gap is also formed between the outermost rotor 3 and the inner wall of the accommodating space 1.1, and the gap is also used to fill the required medium;

[0060] The housing assembly 1 is also provided with a through hole, which is opposite to the inner hole of the inner rotor 3 and is connected through the stationary ring 2 and the hole formed on the inner side of the sealing assembly, and is also used to fill the required medium.

[0061] After the above improvements, all the rotors 3 and sealing components are placed in a medium filled with liquids and gases of different pressures, temperatures and types, and can be subjected to the required heat dissipation and isolation effects.

[0062] As an improvement of the present invention, the stationary ring 2 is detachably connected to the rear end wall of the accommodating space 1.1;

[0063] The protruding end surface of the stationary ring 2 is provided with a contact portion 2.1 of an annular structure, and the front end surface of the contact portion 2.1 is in contact with the rear end surface of the graphite ring 6.

[0064] The high-hardness stationary ring 2 is pressed against the rear end wall of the accommodating space 1.1 through a limiting ring;

[0065] The contact portion 2.1 is arranged on the front end surface of the stationary ring 2, and the contact portion 2.1 cooperates with the graphite ring 6 in surface contact, so that the graphite ring 6 can stably rotate in front of the contact portion 2.1, so that the device has high operating reliability.

[0066] As an improvement of the present invention, the flexible membrane box unit 5 includes a welding seat 5.1, an inlay ring 5.2, and a plurality of groups of elastic annular membranes 5.3;

[0067] The welding seat 5.1 is located on the inner side of the mounting ring 4 and is connected to the axial end surface 3.1 of the rotor 3;

[0068] The insert ring 5.2 is axially movable and connected to the inner side of the mounting ring 4. The rear end of the insert ring 5.2 is provided with a receiving groove 5.21, and the graphite ring 6 is fitted and connected in the receiving groove 5.21.

[0069] A plurality of groups of elastic annular diaphragms 5.3 are welded and stacked in the axial direction, and the annular diaphragms 5.3 at the front end are welded to the welding seat 5.1, and the annular diaphragms 5.3 at the rear end are welded to the front end of the embedded ring 5.2.

[0070] The mounting ring 4 is detachably connected to the shaft end face through a threaded connector, and the inner side of the mounting ring 4 clamps the outer edge of the welding seat 5.1 so that the front end face of the welding seat 5.1 is effectively fitted with the shaft end face to improve the sealing performance;

[0071] The inlay ring 5.2 is arranged on the inner side of the mounting ring 4. The mounting ring 4 limits the radial position of the inlay ring 5.2 and plays a role in maintaining its axial movement.

[0072] The high-strength, wear-resistant graphite ring 6 is embedded in the receiving groove 5.21 at the tail end of the ring, and the two are effectively sealed and positioned through interference fit;

[0073] The flexible diaphragm box is composed of multiple groups of elastic annular diaphragms 5.3 stacked and welded layer by layer, which provides axial compensation force for the seal in the working state, ensures that the friction pair can effectively fit and prevents leakage of the medium.

[0074] As an improvement of the present invention, an axially extending slide groove 4.1 is provided on the inner side of the mounting ring 4;

[0075] A sliding block 5.22 is arranged outside the inlay ring 5.2, and the sliding block 5.22 cooperates with the slide groove 4.1 so that the inlay ring 5.2 can move axially.

[0076] The inner side of the mounting ring 4 is provided with a slide groove 4.1 extending axially, and the number of the slide grooves 4.1 is four.

[0077] Four sliding blocks 5.22 are arranged on the outside of the inlay ring 5.2 to cooperate with the slide groove 4.1 to play a radial positioning role and maintain the movement of the inlay ring 5.2.

[0078] As an improvement of the present invention, the tail end of the graphite ring 6 is radially cut.

[0079] After the above improvement, the contact area between the graphite ring 6 and the contact portion 2.1 is reduced, which can effectively reduce the heat and increase the reliability of the sliding fit.

[0080] As an improvement of the present invention, sealing rings 7 are respectively arranged between the front end of the welding seat 5.1 and the axial end surface 3.1 of the rotor 3, and between the rear end of the stationary ring 2 and the wall surface of the accommodating space 1.1.

[0081] After the above improvements, the sealing performance of the device is further improved, making the device run more reliably.

[0082] The device also has the following beneficial effects:

[0083] 1. Innovatively propose a sealing mode of double-row end face seals in coordinated operation, forming two end face seals through a pair of sealing devices with similar structures and different radial dimensions, and effectively isolating and sealing different working conditions in the three spaces of outer, middle and inner. The inner and outer row rotor 3 seals are composed of five parts: mounting ring 4, welding seat 5.1, mounting ring, high-strength wear-resistant graphite ring 6 and flexible diaphragm box. The mounting ring 4 is used to fix the sealing assembly on the end face of the rotor 3. The four grooves on its inner diameter match the four bosses on the outer diameter of the mounting ring to play a radial positioning role. The welding seat 5.1 is used to connect the flexible diaphragm box and plays a role in axial and radial positioning of the seal. The mounting ring is used for the installation of the high-strength wear-resistant graphite ring 6. The two achieve effective sealing and positioning through interference fit. The high-strength wear-resistant graphite ring 6 is the main sealing end face, and forms a friction sealing pair with the end face of the high-hardness stationary ring 2. The flexible diaphragm box is composed of multiple groups of elastic annular diaphragms 5.3 stacked and welded layer by layer, which provides axial compensation force for the seal under working conditions, ensuring that the friction pair can effectively fit and prevent medium leakage. The inner and outer row seals will rotate with the corresponding rotor 3, and the two can operate independently.

[0084] 2. All parts are made of heat-resistant and pressure-resistant materials, and can operate normally in extreme environments of high temperature, high pressure and high speed. The welding seat 5.1, the mounting ring and the diaphragm box assembly are all made of iron-nickel alloy, which has excellent expansion control characteristics, ensuring that no obvious thermal expansion occurs in a high temperature environment; the mounting ring 4, the limit ring and the high-hardness stationary ring 2 are made of high-temperature alloy steel materials, and still have good performance in extremely high temperature and pressure environments; the high-strength and wear-resistant graphite ring 6 is made of improved graphite sintering and has extremely high density; the dynamic seal and the back of the stationary ring 2 are also installed with a metal sealing ring 7 to effectively seal the mounting surface.

[0085] 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 double-row end-face flexible diaphragm box type self-regulating sealing device suitable for multi-rotor linkage, characterized in that: include: A housing component (1), wherein the housing component (1) is provided with a stationary ring (2); A rotor (3) assembly, the rotor (3) assembly comprising at least two independently rotatable hollow-structured rotors (3), wherein at least two rotors (3) are arranged in an inner and outer arrangement, and the hollow structure of the rotor (3) allows a medium to enter; A sealing assembly, the sealing assembly being arranged between the axial end surface (3.1) of the rotor (3) and the stationary ring (2) so as to seal and isolate the intermediate structure of the rotor (3); The sealing assembly comprises a mounting ring (4), a flexible membrane box unit (5) and a graphite ring (6); The mounting ring (4) is connected to the axial end surface (3.1) of the rotor (3); The flexible membrane box unit (5) and the graphite ring (6) are arranged on the inner side of the mounting ring (4), and the flexible membrane box unit (5), the graphite ring (6) and the mounting ring (4) rotate in conjunction with the rotor (3); The graphite ring (6) and the stationary ring (2) are in surface contact with each other to form a friction seal pair, the flexible diaphragm box unit (5) is connected between the graphite ring (6) and the axial end face (3.1) of the rotor (3), and the flexible diaphragm box unit (5) and the graphite ring (6) and the axial end face (3.1) are sealed respectively; The flexible diaphragm unit (5) applies an axial compensation force to the graphite ring (6) so that the graphite ring (6) maintains effective contact with the stationary ring (2).

2. According to claim 1, a double-row end-face flexible membrane box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: The housing component (1) is provided with a containing space (1.1), the rotor (3) component is arranged in the containing space (1.1), and a gap is formed between the outer rotor (3) and the inner wall of the containing space (1.1).

3. According to claim 2, a double-row end-face flexible membrane box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: The stationary ring (2) is detachably connected to the rear end wall of the accommodating space (1.1); The protruding end surface of the stationary ring (2) is provided with a contact portion (2.1) of an annular structure, and the front end surface of the contact portion (2.1) is in contact with the rear end surface of the graphite ring (6).

4. According to claim 1, a double-row end-face flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: The flexible membrane box unit (5) comprises a welding seat (5.1), an inlay ring (5.2), and a plurality of groups of elastic annular membranes (5.3); The welding seat (5.1) is located on the inner side of the mounting ring (4) and is connected to the axial end surface (3.1) of the rotor (3); The insert ring (5.2) is axially movably connected to the inner side of the mounting ring (4), and a receiving groove (5.21) is provided at the rear end of the insert ring (5.2), and the graphite ring (6) is fitted and connected in the receiving groove (5.21); A plurality of groups of elastic annular diaphragms (5.3) are welded and stacked in an axial direction, and the annular diaphragms (5.3) at the front end are welded to the welding seat (5.1), and the annular diaphragms (5.3) at the rear end are welded to the front end of the embedded ring (5.2).

5. According to claim 4, a double-row end-face flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: An axially extending sliding groove (4.1) is provided on the inner side of the mounting ring (4); A sliding block (5.22) is arranged on the outside of the insert ring (5.2), and the sliding block (5.22) cooperates with the sliding groove (4.1) so that the insert ring (5.2) can move axially.

6. According to claim 3, a double-row end-face flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: The tail end of the graphite ring (6) is radially cut.

7. According to claim 4, a double-row end-face flexible diaphragm box type self-regulating sealing device adapted to multi-rotor linkage, characterized in that: Sealing rings (7) are respectively arranged between the front end of the welding seat (5.1) and the axial end surface (3.1) of the rotor (3), and between the rear end of the stationary ring (2) and the wall surface of the accommodating space (1.1).

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