Containerized mechanical seal device for liquids

Abstract

The present application discloses a containerized mechanical seal device for liquids, comprising: a gland, a dynamic ring seat sleeve, a dynamic seal ring, a static ring seat, a static seal ring, and a locking ring, which are installed around a rotating shaft, wherein: the gland, the dynamic ring seat sleeve, and the static ring seat are each integral parts; the gland is fastened to the rear wall surface of the equipment housing; the rear end of the dynamic ring seat sleeve, which is away from the liquid, extends through the gland, and the locking ring fastens the dynamic ring seat sleeve to the rotating shaft around the rear end of the dynamic ring seat sleeve; the static ring seat is fastened to the rear end face of the gland; in a state where the static ring seat is released from the gland, the dynamic ring seat of the dynamic ring seat sleeve or the static ring seat can slide out along the rotating axis to the side away from the liquid to separate from the gland, so as to separate the dynamic seal ring and the static seal ring forming the sealing interface and expose them to the outside air respectively. The containerized mechanical seal device for liquids provided by the present application can achieve on-line maintenance and repair and reduce leakage points.

Description

Technical Field

[0001] This application relates to liquid sealing technology, and particularly to a cartridge mechanical seal device for liquids between a rotating shaft and a device housing, which has a movable ring seat and a stationary ring seat that can be axially withdrawn. Background Art

[0002] In the prior art, although there are various designs for cartridge mechanical seals for liquids, the dynamic and static sealing rings are both arranged within the liquid of the rotating equipment, and the outer gland is closed relative to the equipment housing to prevent liquid leakage and splashing, which is a necessary and reasonable design.

[0003] The above design often uses a cartridge mechanical seal. In this case, the entire mechanical seal device appears as an integral circle or square when viewed axially. However, the problem is that since the dynamic sealing ring, the static sealing ring, and the axial push spring are all enclosed inside the gland close to the liquid, the actual working conditions of the dynamic sealing ring, the static sealing ring, and the spring during operation cannot be inspected and observed online. Moreover, if the entire mechanical seal device or a part of it needs to be replaced, the rotating equipment needs to be shut down and disassembled before the internal components of the mechanical seal device can be replaced or repaired.

[0004] For this reason, there is also a disclosed split mechanical seal device. Considering the convenience of installation, the cartridge mechanical seal device is designed such that when viewed axially, the gland, the movable ring seat, the dynamic sealing ring, the static sealing ring, the stationary ring seat, and the elastomer are all split, that is, they can be split radially to enable the installation and repair of the mechanical seal device without disassembling a rotating equipment such as a pump. However, the disadvantage is that since there are many split points in the mechanical seal device, the number of leakage points is also large, resulting in poor strength and limited operating pressure of the mechanical seal device. Summary of the Invention

[0005] An object of this application is to provide a cartridge mechanical seal for liquids with better comprehensive performance compared to the prior art.

[0006] To this end, the present application proposes a liquid-packed mechanical seal device for sealing a rotating shaft passing through a device housing, so that the liquid in the device housing is sealed relative to the outside air. The liquid-packed mechanical seal device includes: a gland, a dynamic ring seat sleeve, a dynamic seal ring, a static ring seat, a static seal ring, and a locking ring mounted around the rotating shaft, wherein: the gland, the dynamic ring seat sleeve, and the static ring seat are each integral parts; the gland is fastened to the rear wall surface of the device housing; the front end of the dynamic ring seat sleeve close to the liquid supports the dynamic seal ring by means of a first elastic sealing O-ring, the rear end of the dynamic ring seat sleeve away from the liquid extends through the gland, and the locking ring fastens the dynamic ring seat sleeve to the rotating shaft around the rear end of the dynamic ring seat sleeve; the static ring seat is fastened to the rear end face of the gland, and the inner peripheral surface of the static ring seat close to the liquid supports the static seal ring by means of a second elastic sealing O-ring; the end face of the dynamic seal ring is made to fit the end face of the static seal ring by means of a spring to form a sealing interface perpendicular to the axis of the rotating shaft; in a state where the static ring seat is released from the gland, the dynamic ring seat or the static ring seat of the dynamic ring seat sleeve can slide out along the rotating axis to the side away from the liquid to separate from the gland, so as to separate the dynamic seal ring and the static seal ring forming the sealing interface and expose them to the outside air respectively.

[0007] Optionally, one or both of the dynamic seal ring and the static seal ring have a split structure, and the split line is perpendicular to the axis of the rotating shaft.

[0008] Optionally, one or both of the first elastic sealing O-ring and the second elastic sealing O-ring have a split structure.

[0009] Optionally, the liquid-packed mechanical seal device further includes a spring seat mounted around the rear end of the dynamic ring seat sleeve, fastened to the static ring seat, and holes for receiving springs are provided at the front ends of the spring seat. In a state where the spring seat is released from the static ring seat, the spring seat can slide out along the rotating axis to the side away from the liquid to separate from the static ring seat, so as to expose the spring to the outside air.

[0010] Optionally, the dynamic ring seat sleeve includes a shaft sleeve around the rotating shaft, holes for receiving springs are provided at the front ends of the shaft sleeve, and wherein the dynamic ring seat is mounted around the shaft sleeve, the front end of the dynamic ring seat is pushed by the spring, and the rear end of the dynamic ring seat supports the dynamic seal ring.

[0011] Optionally, a radially penetrating flushing hole is formed in the gland, a groove is formed on the outer peripheral surface of the static ring seat, the bottom of the groove is communicated to the front end face of the static ring seat through a plurality of axial through holes, and the inner end of the flushing hole communicates with the groove; or a radially inwardly extending flushing hole is formed on the outer peripheral surface of the static ring seat, and the radially inner end of the flushing hole is communicated to the front end face of the static ring seat through a through hole.

[0012] Optionally, the static seal ring is configured to be movable relative to the static ring seat towards the front side to separate from the static ring seat; or the static seal ring is configured to be movable relative to the static ring seat towards the rear side to separate from the static ring seat.

[0013] Optionally, the cartridge mechanical seal device for liquid further includes a detachable positioning block, and the locking ring is rotatably positioned relative to the positioning block to assemble together the gland, the rotating ring seat sleeve, the driven ring seat sleeve, the dynamic seal ring supported by the first elastic sealing O-ring, the static ring seat, the static seal ring supported by the second elastic sealing O-ring, and the spring, thereby forming a cartridge mechanical seal.

[0014] Optionally, the spring is configured as a small cylindrical coil spring.

[0015] Optionally, the static ring seat is fastened to the rear end face of the gland by inserting the body of the static ring seat into the gland or by mounting the body of the static ring seat on the rear end face of the gland, and wherein the spring seat is fastened to the rear end face of the static ring seat by inserting the body of the spring seat into the static ring seat or by mounting the body of the spring seat on the rear end face of the static ring seat.

[0016] According to the present application, both the rotating ring seat sleeve and the static ring seat have portions extending axially outside the gland (air side), such that the rotating ring seat and the static ring seat can be axially withdrawn with the dynamic seal ring and the static seal ring, so as to be externally separated for inspection or replacement, avoiding seal failure caused by wear of the dynamic seal ring and / or the static seal ring.

[0017] One or both of the dynamic seal ring and the static seal ring are of split structure, and / or one or both of the first elastic sealing O-ring and the second elastic sealing O-ring are of split structure, which are easy to replace by radial disassembly and assembly, so that on-line maintenance and repair of the cartridge mechanical seal device or a part thereof can be realized, reducing the losses and repair costs of shutdown and production suspension. On the other hand, the rotating ring seat sleeve, the rotating ring seat, the static ring seat, and the gland are each of integral single-piece structure, which reduces the leakage points and has higher strength compared with the split structure, thus effectively preventing safety accidents caused by seal failure and meeting the requirements of a wide range of working conditions.

[0018] In the case where a spring seat is provided relative to the static seal ring, the integral spring seat can be axially withdrawn, such that the axially pressed spring can be externally exposed for inspection or replacement, avoiding seal failure caused by fatigue and performance degradation of the axially pressed spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The foregoing and other aspects of the present application will be more fully understood from the following detailed description with reference to the accompanying drawings, in which:

[0020] Figure 1It is a cross-sectional view of a containerized mechanical seal device for liquids according to an embodiment of the present application;

[0021] Figure 2 It is Figure 1 an end view of the seal device in [[ ]] as seen axially from the air side;

[0022] Figure 3 It is Figure 1 a cross-sectional view of the stationary ring of the seal device in [[ ]];

[0023] Figure 4 It is Figure 3 a cross-sectional view of the stationary ring seat in the stationary ring in [[ ]];

[0024] Figure 5 It is Figure 3 a cross-sectional view of the static seal ring in the stationary ring in [[ ]];

[0025] Figure 6 It is Figure 1 a cross-sectional view of the rotating ring of the seal device in [[ ]];

[0026] Figure 7 It is Figure 6 a cross-sectional view of the rotating ring seat sleeve in the rotating ring in [[ ]];

[0027] Figure 8 It is Figure 6 a cross-sectional view of the dynamic seal ring in the rotating ring in [[ ]];

[0028] Figure 9 It is Figure 1 a cross-sectional view of the gland of the seal device in [[ ]];

[0029] Figure 10 It is Figure 1 a cross-sectional view of the locking ring of the seal device in [[ ]];

[0030] Figure 11 It is a cross-sectional view of a containerized mechanical seal device for liquids according to another embodiment of the present application;

[0031] Figure 12 It is Figure 11 a cross-sectional view of the stationary ring of the seal device in [[ ]];

[0032] Figure 13 It is Figure 11 a cross-sectional view of the stationary ring seat in the stationary ring in [[ ]];

[0033] Figure 14 It is Figure 11 a cross-sectional view of the spring seat in the stationary ring in [[ ]];

[0034] Figure 15 It is a cross-sectional view of a containerized mechanical seal device for liquids according to yet another embodiment of the present application;

[0035] Figure 16 is Figure 15 a cross-sectional view of the moving ring seat sleeve of the sealing device in

[0036] Figure 17 is Figure 15 a cross-sectional view of the dynamic sealing ring of the sealing device in

[0037] Figure 18 is Figure 15 a cross-sectional view of the static ring seat of the sealing device in

[0038] Figure 19 is Figure 15 a cross-sectional view of the static sealing ring of the sealing device in

[0039] Figure 20 is Figure 15 a cross-sectional view of the gland of the sealing device in

[0040] Figure 21 is Figure 15 a cross-sectional view of the spring seat of the sealing device in; and

[0041] Figure 22 is a cross-sectional view of a canned mechanical seal device for liquids according to another embodiment of the present application. Detailed Embodiments

[0042] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application.

[0043] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0044] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as limiting. Thus, other examples of exemplary embodiments may have different values.

[0045] It should be noted that: Like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0046] The present application generally relates to a canned mechanical seal device for liquids, an exemplary embodiment of which is shown in Figure 1 , Figure 2 and [[ID=;42]]Figures 3 - 10 shows some structural details of this embodiment. This embodiment will be described below with reference to these figures.

[0047] As Figure 1 , Figure 2 shown, the containerized mechanical seal device for the liquid is used to seal the rotating shaft 100 relative to the equipment housing 101. The front side ( Figure 1 the left side in Figure 1 ) of the equipment housing 101 is the liquid side, and the rear side (

[0048] the right side in

[0048] ) is the air side. The rotating shaft 100 passes through the equipment housing 101 and extends from the front side to the rear side.

[0049] This seal device mainly includes: a dynamic ring fixed on the rotating shaft 100 and rotating together with the rotating shaft 100, and a static ring fixed relative to the equipment housing 101 and not rotating together with the rotating shaft 100.

[0049] The dynamic ring includes a dynamic ring seat sleeve 1 and a dynamic sealing ring 2 supported by the dynamic ring seat sleeve 1. The dynamic sealing ring 2 is circumferentially positioned relative to the dynamic ring seat sleeve 1 by a plurality of positioning pins 3 to prevent relative rotation.

[0050] The static ring includes a gland 8, a static ring seat 5 and a static sealing ring 4 supported by the static ring seat 5. The static ring seat 5 is provided with a plurality of springs 6 that axially push the static sealing ring 4 forward. And the static sealing ring 4 is circumferentially positioned relative to the static ring seat 5 by a plurality of positioning pins 7 to prevent relative rotation. The spring 6 axially pushes the static sealing ring 4 forward against the dynamic sealing ring 2, so that a certain axial pressure is maintained between the dynamic sealing ring 2 and the static sealing ring 4, and the dynamic sealing ring 2 is allowed to rotate relative to the static sealing ring 4. In other words, by means of the spring 6, the end face of the dynamic sealing ring 2 is attached to the end face of the static sealing ring 4 to form a sealing interface perpendicular to the axis of the rotating shaft 100. The spring 6 is preferably a small cylindrical spring.

[0051] One or both of the dynamic sealing ring 2 and the static sealing ring 4 may have a split structure, that is, it includes a pair of semi-circular half bodies, and this pair of half bodies are combined with each other around the rotating shaft 100 to form a complete sealing ring. At the joint interface between the two half bodies, that is, the split surface, a mutually cooperating structure, such as a convex-concave mating structure, may be provided to facilitate maintaining the connection state between the two half bodies. In addition, the joint interface between the two half bodies may be rough to help with mutual cooperation. Viewed axially, the split line between the two half bodies is perpendicular to the axis of the rotating shaft 100.

[0052] If both the dynamic sealing ring 2 and the static sealing ring 4 are split type, then the split surfaces of the two need to be staggered from each other in the circumferential direction.

[0053] In consideration of the problem of facilitating the replacement of the dynamic seal ring 2 and the static seal ring 4, it is preferred that both of them adopt a split structure. However, it is also within the scope of this application that only one of the dynamic seal ring 2 and the static seal ring 4 (especially the one that is prone to wear) adopts a split structure.

[0054] The gland 8 is used to fix the static ring relative to the equipment housing 101. A gasket 9 is arranged between the gland 8 and the equipment housing 101. The gland 8 is fastened to the rear wall surface of the equipment housing 101 by a plurality of bolts 10.

[0055] The static ring seat 5 is fastened to the rear end face of the gland 8 by a plurality of bolts 11. Moreover, the static ring seat 5 is circumferentially positioned relative to the gland 8 by a plurality of positioning pins 12 to prevent relative rotation.

[0056] The dynamic ring seat sleeve 1 is sleeved on the rotating shaft 100, and the locking ring 13 surrounds the axial rear end of the dynamic ring seat sleeve 1 to fix the dynamic ring seat sleeve 1 to the rotating shaft 100. More specifically, one or more fastening screws 17 are screwed radially into the locking ring 13 and pass through the axial rear end of the dynamic ring seat sleeve 1, thereby fastening the dynamic ring seat sleeve 1 to the rotating shaft 100.

[0057] When assembling the sealing device relative to the equipment housing 101, the locking ring 13 is axially positioned relative to the static ring seat 5 by a plurality of positioning blocks 14. Bolts 15 passing axially through each positioning block 14 fix the positioning blocks 14 to the axial rear end face of the static ring seat 5. The radial protrusions 16 on each positioning block 14 are inserted into the circumferential annular guide groove (as described later) of the locking ring 13. On the one hand, it restricts the axial movement of the locking ring 13 relative to the static ring seat 5, and on the other hand, it allows the locking ring 13 to rotate relative to the static ring seat 5. The positioning blocks 14 are detachable. When preparing to rotate the rotating shaft 100 for normal operation, the positioning blocks 14 will be removed from the static ring seat 5.

[0058] The distribution of the bolts 10, bolts 11, bolts 15, positioning blocks 14 and their radial protrusions 16 can be referred to Figure 2 . It should be noted that their quantity and distribution positions are not limited to Figure 2 shown.

[0059] Figure 3 The static seal ring 4 of the static ring and the static ring seat 5 are shown, and an O-ring 18 is arranged between the two to achieve the seal between them. An O-ring 19 is arranged on the outer periphery of the static ring seat 5 for achieving the seal between the static ring seat 5 and the gland 8.

[0060] See Figure 4, the stationary seal ring seat 5 is a generally annular integral part. Inside its axially penetrating interior, a groove 21, a disc-shaped groove 22 with a diameter larger than that of groove 21, a disc-shaped groove 23 with a diameter larger than that of groove 22, and a disc-shaped groove 24 with a diameter larger than that of groove 23 are successively formed from the rear side to the front side in the axial direction. A circular stepped surface 25 facing the front side is defined between groove 22 and groove 21, a circular stepped surface 26 facing the front side is defined between groove 23 and groove 22, and a circular stepped surface 27 facing the front side is defined between groove 24 and groove 23. The inner diameter of groove 21 is slightly larger than the outer diameter of the shaft sleeve 51.

[0061] A flange 28 that radially protrudes outward relative to the main body part of the stationary seal ring seat 5 is formed at the rear end of the stationary seal ring seat 5, and a convex ring part 29 that axially protrudes forward is formed at the front end. The inner side of the convex ring part 29 defines groove 24.

[0062] The flange 28 is used for axially abutting against the rear end face of the gland 8 for installation. An axially penetrating through hole 30 is formed in the flange 28 for the bolt 11 to pass through. A positioning pin hole 31 is formed in the front end face of the flange 28 for inserting the positioning pin 12 therein.

[0063] A plurality of screw holes 32 are formed in the rear end face of the stationary seal ring seat 5 for the bolts 15 to be screwed into.

[0064] On the outer periphery of the main body part of the stationary seal ring seat 5, on the axially front side of the flange 28 and close to the flange 28, a ring groove 33 is formed for accommodating the O-ring 19.

[0065] On the outer periphery of the main body part of the stationary seal ring seat 5, on the axially front side of the ring groove 33, a groove 34 is formed. The radially inner end of the groove 34 is connected to the groove 24 through a plurality of axially through holes 35.

[0066] In addition, a plurality of spring slots 36 that axially extend backward are formed at the stepped surface 25 for accommodating the rear parts of the corresponding springs 6, and a plurality of positioning pin holes 37 that axially extend backward are formed for inserting the rear parts of the corresponding positioning pins 7 therein.

[0067] See Figure 5 , the stationary seal ring 4 is annular, preferably (but not necessarily) formed by splicing two half bodies. The stationary seal ring 4 includes a cylindrical body 41 and a convex ring part 42 with a diameter larger than that of the cylindrical body 41 on the front side of the cylindrical body 41. An axially through hole 43 and a groove 44 with a diameter larger than that of the through hole 43 on the front side of the through hole 43 are formed inside the stationary seal ring 4. The inner diameter of the through hole 43 is slightly larger than the outer diameter of the shaft sleeve 51.

[0068] A plurality of positioning grooves 46 are formed in the rear end face of the cylindrical body 41 for accommodating the front parts of the corresponding positioning pins 7. The positioning grooves 46 can radially penetrate the corresponding parts of the cylindrical body 41.

[0069] When installing the stationary seal ring 4 onto the stationary ring seat 5, the rear portion of the cylindrical body 41 is inserted backward from the front side into the groove 22 of the stationary ring seat 5. The rear end face of the cylindrical body 41 is pushed forward by the spring 6 and kept separated from the step face 25 by a small axial distance. The front portion of the cylindrical body 41 carries the O-ring 18 and is located in the groove 23. The convex ring portion 42 is generally located in the groove 24. The front end of the convex ring portion 42 may protrude slightly forward relative to the front end of the convex ring portion 29 (this is not necessary).

[0070] Figure 6 Shown in it are the rotating ring seat sleeve 1 and the rotating seal ring 2 of the rotating ring. Sealing is achieved between the rotating ring seat sleeve 1 and the rotating seal ring 2 through the O-ring 47. Sealing between the rotating ring seat sleeve 1 and the rotating shaft 100 is achieved through the O-ring 48.

[0071] Corresponding to one or both of the split-structured rotating seal ring 2 and stationary seal ring 4, one or both of the elastic sealing O-ring 47 and the second elastic sealing O-ring 18 also have a split structure. Structures that cooperate with each other, including but not limited to convex-concave, embedding, and split mating structures, may be provided at the cut portions that form the elastic sealing O-ring 47 and the cut portions that form the elastic sealing O-ring 18, so as to facilitate maintaining the connection state between the two halves.

[0072] See Figure 7 , the rotating ring seat sleeve 1 is a generally cylindrical integral part, which includes a shaft sleeve 51. The inner diameter of the shaft sleeve 51 is substantially equal to the outer diameter of the rotating shaft 100, such that the shaft sleeve 51 can be sleeved on the rotating shaft 100. A number of radially penetrating through-holes 52 are formed in the rear end portion of the shaft sleeve 51 for screwing in the corresponding fastening screws 17. A circumferential groove 53 is formed in the inner wall surface of the front end portion of the shaft sleeve 51 for accommodating the O-ring 48.

[0073] The rotating ring seat sleeve 1 further includes a flange 54 extending backward from the front end of the shaft sleeve 51. The flange 54 surrounds the front end of the shaft sleeve 51, thereby defining a circumferential groove 55 between the inner peripheral wall of the flange 54 and the outer peripheral wall of the front end of the shaft sleeve 51. At the front side portion of the circumferential groove 55, the outer peripheral wall diameter of the front end of the shaft sleeve 51 is increased to form a narrowed circumferential groove portion 56. A circumferential groove 57 is formed in the inner peripheral wall of the flange 54 for accommodating the O-ring 47. In the bottom of the circumferential groove 55, a number of axially extending locating pin grooves 58 are formed for inserting the front portions of the corresponding locating pins 3 therein.

[0074] See Figure 8, the dynamic seal ring 2 is annular, defining an axially through hole, the inner diameter of which is slightly larger than the outer diameter of the shaft sleeve 51. The dynamic seal ring 2 is preferably (but not necessarily) formed by splicing two half bodies. The dynamic seal ring 2 includes a cylindrical body 61 and a flange 62 radially extending outward at the rear end of the cylindrical body 61. The outer diameter of the flange 62 is substantially equal to the outer diameter of the flanging 54 of the dynamic ring seat sleeve 1. A conical ring portion is formed at the front end of the cylindrical body 61, and a plurality of positioning grooves 63 are formed in the conical ring portion for accommodating the rear portions of the corresponding positioning pins 3. The positioning grooves 63 can radially penetrate the conical ring portion.

[0075] When installing the dynamic seal ring 2 onto the dynamic ring seat sleeve 1, the dynamic seal ring 2 is sleeved on the shaft sleeve 51 from the rear end of the shaft sleeve 51 and slides forward, so that the cylindrical body 61 is inserted forward from the axial rear side into the annular groove 55 of the dynamic ring seat sleeve 1, and the conical ring portion is used for inserting into the narrowed annular groove portion 56. The flange 62 faces the rear end face of the flanging 54, but there is a very small gap between the flange 62 and the rear end face of the flanging 54.

[0076] After installing the dynamic seal ring 2 onto the dynamic ring seat sleeve 1, the static seal ring 4 and the static ring seat 5 can be slid forward in sequence from the rear end of the shaft sleeve 51, so that the front end face of the static seal ring 4 contacts the rear end face of the dynamic seal ring 2. Under the axial forward thrust of the spring 6, the convex ring portion 42 of the static seal ring 4 is pushed forward against the rear end face of the dynamic seal ring 2, wherein the outer ring portion of the convex ring portion 42 is pressed against the flange 62, and the inner ring portion of the convex ring portion 42 is pressed against the cylindrical body 61.

[0077] In this way, the dynamic seal ring 2, the static seal ring 4 and the static ring seat 5 are arranged around the shaft sleeve 51 of the dynamic ring seat sleeve 1 in sequence. The shaft sleeve 51 has sufficient axial length so that, when carrying the dynamic seal ring 2, the static seal ring 4 and the static ring seat 5, the rear end portion of the shaft sleeve 51 protrudes from the static ring seat 5 and is inserted into the locking ring 13.

[0078] See Figure 9 , the gland 8 is a generally annular integral part, which includes a circular ring body 64 defining an internal axial through hole and an annular hook portion 65 extending from the inner circumference of the front end of the circular ring body 64 to the rear side. A ring groove 66 is defined between the annular hook portion 65 and the inner wall surface of the circular ring body 64. The front end of the annular hook portion 65 slightly protrudes forward relative to the front end face of the circular ring body 64 to form an annular boss 67. A radially through flushing hole 68 is formed in the circular ring body 64, and the radially outer section of the flushing hole 68 is a threaded hole, and a plug can be used to close the flushing hole 68 here. A plurality of screw holes 69 are formed in the rear end face of the circular ring body 64 for being screwed into by the corresponding bolts 11. A plurality of positioning pin holes 70 are also formed in the rear end face of the circular ring body 64 for accommodating the front portions of the corresponding positioning pins 12. In addition, a plurality of through holes 71 penetrating through the front and rear are formed in the circular ring body 64 for being penetrated by the corresponding bolts 10.

[0079] The annular boss 67 of the gland 8 abuts against the gasket 9 and is fastened to the rear wall surface of the equipment housing 101. The main body part of the stationary ring seat 5 is axially inserted into the inner through-hole of the gland 8 from the rear side, and the convex ring part 29 is inserted into the ring groove 66. The radially inner section of the flushing hole 68 is aligned with the groove 34, so as to communicate the flushing hole 68 with the groove 34. The O-ring 19 seals between the main body part of the stationary ring seat 5 and the circular ring body 64 of the gland 8. The flange 28 is fastened to the rear end face of the gland 8 by bolts 11.

[0080] The inner diameter of the inner hole defined at the hook part 65 of the gland 8 is larger than the outer diameter of the flange 62 of the dynamic seal ring 2 and the outer diameter of the flanging 54 of the dynamic ring seat sleeve 1. Thus, there is a gap between the inner circumference of the gland 8 and the outer circumferences of the dynamic ring seat sleeve 1, the dynamic seal ring 2, and the static seal ring 4. The flushing hole 68 communicates with the inside of the equipment housing 101 through the groove 34, the axial through-hole 35, the groove 24 of the stationary ring seat 5, and this gap, thereby forming a flushing channel.

[0081] See Figure 10 , the locking ring 13 is a generally circular ring-shaped integral part, which defines an axially through-hole. The locking ring 13 includes a cylindrical main body 72 and a circular ring 73 protruding inward at the rear end part of the cylindrical main body 72. The cylindrical main body 72 defines the main body part of the axially through-hole, and the circular ring 73 defines the reduced-diameter part of the axially through-hole. The inner diameter of the main body part of the axially through-hole is equal to or slightly larger than the outer diameter of the rear end part of the bushing 51 of the dynamic ring seat sleeve 1, and the inner diameter of the reduced-diameter part of the axially through-hole is slightly larger than the outer diameter of the rotating shaft 100. The locking ring 13 is sleeved on the rotating shaft 100, the main body part of the axially through-hole surrounds the rear end part of the bushing 51, and the circular ring 73 axially abuts forward against the rear end face surrounding the bushing 51.

[0082] A circular ring-shaped guide groove 74 is formed in the outer peripheral surface of the cylindrical main body 72. Each positioning block 14 is evenly distributed around the rear end part of the bushing 51 and the locking ring 13. The radial protrusions 16 of each positioning block 14 are slidably inserted into the circular ring-shaped guide groove 74, so as to allow the locking ring 13 to rotate relative to each positioning block 14, but the axial position of the locking ring 13 is restricted by each positioning block 14.

[0083] In addition, in the cylindrical main body 72, one or more threaded holes 75 are formed. The threaded holes 75 extend from the bottom of the circular ring-shaped guide groove 74 to the inner wall surface of the cylindrical main body 72. The fastening screws 17 are screwed into the threaded holes 75 and pass through the through-hole 52 in the rear end part of the bushing 51 to fasten the bushing 51 on the outer peripheral surface of the rotating shaft 100.

[0084] In the sealing device described above, the moving ring is fixed to the rotating shaft 100 by the locking ring 13 and the fastening screw 17, and thus rotates together with the rotating shaft 100. The stationary ring is fixed to the gland 8 and thus cannot rotate together with the rotating shaft 100. The static sealing ring 4 is axially pushed forward against the dynamic sealing ring 2 by the spring 6, and the dynamic sealing ring 2 is allowed to rotate relative to the static sealing ring 4. The locking ring 13 is rotatable relative to the stationary ring seat 5 but cannot move axially.

[0085] Therefore, since the locking ring 13 is rotatably positioned relative to the positioning block 14 to assemble the gland 8, the moving ring seat sleeve 1, the driven ring seat sleeve 1, the dynamic sealing ring 2 supported by the elastic sealing O-ring 47, the stationary ring seat 5, the static sealing ring 4 supported by the elastic sealing O-ring 18 by the stationary ring seat 5, and the spring together, a cartridge mechanical seal is formed.

[0086] Since only one or both of the dynamic sealing ring 2 and the static sealing ring 4 have a split structure, and / or one or both of the elastic sealing O-ring 47 and the second elastic sealing O-ring 18 also have a split structure, while the moving ring seat sleeve 1, the stationary ring seat 5, and the gland 8 are each an integral single-piece structure, compared with the solution of all using split structures, the leakage points are reduced and the strength is higher, so that safety accidents caused by seal failure can be effectively prevented and the requirements of a wide range of working conditions can be met.

[0087] In addition, the dynamic sealing ring 2, the static sealing ring 4, and the stationary ring seat 5 are all carried by the moving ring seat sleeve 1, and the moving ring seat sleeve 1 is connected to the stationary ring seat 5 by the locking ring 13. Therefore, the moving ring and the stationary ring can slide axially around the rotating shaft 100 as a combined body. In this way, this cartridge assembly can slide forward along the rotating shaft 100 and be inserted into the equipment housing 101, and the gland 8 is fastened to the equipment housing 101. The moving ring seat sleeve 1, the dynamic sealing ring 2, the static sealing ring 4, and the stationary ring seat 5 all have parts in contact with the liquid inside the equipment housing 101, and the outer parts of the moving ring seat sleeve 1 and the stationary ring seat 5 are exposed to the air side. The outer part of the moving ring seat sleeve 1 is fastened to the rotating shaft 100, and the outer part of the stationary ring seat 5 is fastened to the gland 8. The outer part of the moving ring seat sleeve 1 is further restricted from axial movement relative to the outer part of the stationary ring seat 5 but relative rotation between the two is allowed. As described above, when the installation of the sealing device is completed, that is, the rotating shaft 100 can rotate normally, the positioning block 14 has been removed.

[0088] When inspecting and maintaining the sealing device (excluding the positioning block 14), the bolts 11 are removed to release the stationary ring seat 5 from the gland 8. This allows the stationary ring seat 5, which supports the static seal ring 4, to slide rearward along the rotating shaft 100 to separate from the gland 8. This separates the dynamic seal ring 2 and the static seal ring 4, which form the sealing interface, and exposes each to air. This allows the dynamic seal ring 2, the static seal ring 4, and the spring 6 to be inspected and replaced if necessary. For a split dynamic seal ring 2 or static seal ring 4, the two halves can be removed by simply separating them radially from each other, and then the two new halves can be assembled radially opposite each other. To allow the stationary ring seat 5 to slide fully rearward along the rotating shaft 100, a sufficiently long axial distance is separated between the locking ring 13 and the stationary ring seat 5. That is, the sleeve 51 and the positioning block 14 both have an extended axial length.

[0089] Because this sealing device features an integral gland 8, integral dynamic ring seat 1, and integral stationary ring seat 5, it remains a monolithic, cartridge-type mechanical seal with minimal subdivision. This reduces the potential for leakage due to multiple subdivision points, improves the seal's compressive strength, and effectively facilitates necessary maintenance and overhaul of the operating mechanical seal. Furthermore, the easily replaceable split seal ring facilitates emergency response and widespread application. This ensures the safety, effectiveness, and reliability of the sealing device's operation while significantly reducing the cost of downtime and production interruptions due to seal maintenance.

[0090] According to the principles of the present application, those skilled in the art can make various modifications to the structure of the sealing device described above.

[0091] For example, Figure 11 Another exemplary embodiment of a liquid cartridge mechanical seal is shown. Figures 12 - 14 Some structural details of this embodiment are shown. The difference between this embodiment and the previously described embodiment lies in the difference in the stationary ring.

[0092] like Figure 11 and Figure 12 As shown in , the stationary ring in this example includes a static sealing ring 4, a stationary ring seat 5 and a spring seat 80. The static sealing ring 4 can have the same structure as the static sealing ring 4 in the previous embodiment. The rear cylindrical body 41 of the static sealing ring 4 is inserted into the stationary ring seat 5 from the front side and supported by the stationary ring seat 5, and the front part of the spring seat 80 is inserted into the stationary ring seat 5 from the rear side and supported by the stationary ring seat 5. The rear part of the spring seat 80 is fixed to the rear end face of the stationary ring seat 5 by a number of bolts 81, and is positioned relative to the stationary ring seat 5 in the circumferential direction by one or more locating pins 82. The detachable positioning block 14 is fastened to the rear end face of the spring seat 80 by bolts 15.

[0093] The front end face of the spring seat 80 faces the rear end face of the static seal ring 4 (i.e., the rear end face of the cylindrical body 41), and is pressed against the rear end face of the static seal ring 4 by a plurality of springs 6, and the circumferential positioning between the spring seat 80 and the static seal ring 4 is realized by a plurality of positioning pins 7 arranged between the front end face of the spring seat 80 and the rear end face of the static seal ring 4.

[0094] See Figure 13 , in this example, the static ring seat 5 is a generally circular ring-shaped integral part. Inside its axially penetrating interior, a groove 21, a disc-shaped groove 22 with a diameter smaller than that of the groove 21, a disc-shaped groove 23 with a diameter larger than that of the groove 22, and a disc-shaped groove 24 with a diameter larger than that of the groove 23 are formed in sequence from the rear side to the front side in the axial direction. A circular ring-shaped step surface 83 facing the rear side is defined between the groove 22 and the groove 21, a circular ring-shaped step surface 26 facing the front side is defined between the groove 23 and the groove 22, and a circular ring-shaped step surface 27 facing the front side is defined between the groove 24 and the groove 23. The inner diameter of the through hole 22 is slightly larger than the outer diameter of the cylindrical body 41.

[0095] A flange 28 radially protruding outward relative to the main body portion of the static ring seat 5 is formed at the rear end of the static ring seat 5, and a convex ring portion 29 protruding axially forward is formed at the front end. A groove 24 is defined inside the convex ring portion 29.

[0096] In addition, a plurality of screw holes 84 for screwing in bolts 81 and one or more positioning pin grooves 85 for placing the front portion of the positioning pin 82 are formed in the rear end face of the static ring seat 5.

[0097] The flange 28 is used for axially abutting against the rear end face of the gland 8 for installation. A through hole 30 axially penetrating is formed in the flange 28 for the bolt 11 to pass through. A positioning pin hole 31 is formed in the front end face of the flange 28 for inserting the positioning pin 12 therein.

[0098] On the outer periphery of the main body portion of the static ring seat 5, on the axially front side of the flange 28 and close to the flange 28, a ring groove 33 is formed for placing the O-ring 19.

[0099] On the outer periphery of the main body portion of the static ring seat 5, on the axially front side of the ring groove 33, a groove 34 is formed. The radially inner end of the groove 34 is connected to the groove 24 through a plurality of axial through holes 35.

[0100] See Figure 14, the spring seat 80 is a generally annular integral part, including a cylindrical body 86 that defines an internal axial through-hole 87. A radially outwardly extending flange 88 is formed at the rear end of the cylindrical body 86. The outer diameter of the main body portion of the cylindrical body 86 is approximately equal to or slightly smaller than the inner diameter of the groove 21 of the stationary ring seat 5, and the axial length of the main body portion of the cylindrical body 86 is approximately equal to the axial length of the groove 21, such that the main body portion of the cylindrical body 86 can be inserted into the groove 21, and the flange 88 is mounted against the rear end face of the stationary ring seat 5.

[0101] One or more positioning grooves 89 are formed in the front end face of the flange 88 for inserting the rear portion of the positioning pin 82 therein. A number of axially through holes 90 are also formed in the flange 88 for the bolts 81 to pass through. A number of screw holes 91 are also formed in the rear end face of the spring seat 80 for screwing the corresponding bolts 15 therein.

[0102] The front end portion of the through-hole 87 forms an enlarged reamed portion 92, and an axially forwardly protruding convex ring portion 93 and a forward-facing stepped surface 94 are formed at the front end of the main body portion of the cylindrical body 86 through the enlarged reamed portion 92. The convex ring portion 93 is used to abut against the stepped surface 83 of the stationary ring seat 5. A number of spring slots 95 extending axially rearward are formed in the stepped surface 94 for accommodating the rear portions of the corresponding springs 6, and a number of positioning pin holes 96 extending axially rearward are formed for inserting the rear portions of the corresponding positioning pins 7 therein.

[0103] The dynamic seal ring 2, the static seal ring 4, the stationary ring seat 5, and the spring seat 80 are arranged in sequence around the bushing 51 of the dynamic ring seat sleeve 1. The bushing 51 has a sufficient axial length such that, when carrying the dynamic seal ring 2, the static seal ring 4, the stationary ring seat 5, and the spring seat 80, the rear end portion of the bushing 51 projects from the stationary ring seat 5 and is inserted into the locking ring 13. The dynamic ring seat sleeve 1 is fastened to the rotating shaft 100 by fastening screws 17. The locking ring 13 and the spring seat 80 are axially locked by a detachable positioning block 14 and bolts 15. The locking ring 13 can rotate relative to the positioning block 14 but cannot move axially.

[0104] Other aspects of this embodiment may be the same as or similar to the embodiments described above with reference to Figure 1 etc., and will not be described herein again.

[0105] In other words, in the present embodiment, by unscrewing the bolt 11, the stationary ring seat 5 can also slide backward along the rotating shaft 100. In addition, in the present embodiment, by providing a spring seat 80 for supporting the spring 6 that pushes the stationary seal ring 4 forward, it is possible to release the spring seat 80 from the stationary ring seat 5 by separately removing the bolt 81, so that the spring seat 80 is separated from the stationary ring seat 5, and the spring 6 is exposed to the air, making it more convenient to repair or replace the spring 6. In order to enable the stationary ring seat 5 and / or the spring seat 80 to slide backward sufficiently along the rotating shaft 100, a sufficient axial distance is provided between the locking ring 13 and the spring seat 80, that is, both the sleeve 51 and the positioning block 14 have an extended axial length.

[0106] Figure 15 Another exemplary embodiment of the assembled mechanical seal device for liquids is shown. Figures 16 - 21 Some structural details of this embodiment are shown. This embodiment is Figures 11 - 14 the same as the embodiment shown in that it also uses a spring seat, but different in the structure of some components.

[0107] First, refer to Figure 15 , the seal device mainly includes: a rotating ring fixed on the rotating shaft 100 and rotating with the rotating shaft 100, and a stationary ring fixed relative to the equipment housing 101 and not rotating with the rotating shaft 100.

[0108] The rotating ring includes a rotating ring seat sleeve 1 sleeved on the rotating shaft 100 and a rotating seal ring 2 supported by the rotating ring seat sleeve 1. An O-ring 47 is provided between the rotating ring seat sleeve 1 and the rotating seal ring 2. The rotating seal ring 2 is circumferentially positioned relative to the rotating ring seat sleeve 1 by a plurality of positioning pins 3 to prevent relative rotation. The front end of the rotating ring seat sleeve 1 is sealed with the rotating shaft 100 through an O-ring 48.

[0109] The stationary ring includes a stationary seal ring 4, a stationary ring seat 5, and a spring seat 80. The stationary ring seat 5 surrounds and supports the stationary seal ring 4. An O-ring 18 is provided between the inner circumference of the stationary ring seat 5 and the outer circumference of the stationary seal ring 4. The spring seat 80 is fixed to the rear end face of the stationary ring seat 5 by a plurality of bolts 81.

[0110] The middle of the front end of the spring seat 80 faces the rear end face of the stationary seal ring 4, and is pushed against the rear end face of the stationary seal ring 4 by a plurality of springs 6, and the circumferential positioning between the spring seat 80 and the stationary seal ring 4 is achieved by a plurality of positioning pins 7 arranged between the middle of the front end of the spring seat 80 and the rear end face of the stationary seal ring 4 to prevent relative rotation. The spring 6 pushes the stationary seal ring 4 axially forward against the rotating seal ring 2, so that a certain axial pressure is maintained between the rotating seal ring 2 and the stationary seal ring 4, and the rotating seal ring 2 is allowed to rotate relative to the stationary seal ring 4.

[0111] The gland 8 is used to fix the stationary ring relative to the equipment housing 101. The gland 8 is fastened to the rear wall surface of the equipment housing 101 by a plurality of bolts 10. An O-ring 102 is provided between the gland 8 and the equipment housing 101. The stationary ring seat 5 is fastened to the rear end face of the gland 8 by a plurality of bolts 11. An O-ring 19 is provided between the front end face of the stationary ring seat 5 and the rear end face of the gland 8.

[0112] The moving ring seat sleeve 1 is sleeved on the rotating shaft 100, and the locking ring 13 surrounds the axial rear end of the moving ring seat sleeve 1 to fix the moving ring seat sleeve 1 to the rotating shaft 100. More specifically, one or more fastening screws 17 are screwed radially into the locking ring 13 and pass through the axial rear end of the moving ring seat sleeve 1, thereby fastening the moving ring seat sleeve 1 to the rotating shaft 100.

[0113] The locking ring 13 is axially positioned relative to the spring seat 80 by a plurality of positioning blocks 14. Bolts 15 passing axially through each positioning block 14 fix the positioning blocks 14 to the axial rear end face of the spring seat 80. The radial protrusions 16 on each positioning block 14 are inserted into the circumferential annular guide groove of the locking ring 13, on the one hand, restricting the axial movement of the locking ring 13 relative to the spring seat 80, and on the other hand, allowing the locking ring 13 to rotate relative to the spring seat 80.

[0114] See Figure 16 , the moving ring seat sleeve 1 is a generally cylindrical integral part, which includes a shaft sleeve 51. The inner diameter of the shaft sleeve 51 is larger than the outer diameter of the rotating shaft 100, so that the shaft sleeve 51 can be sleeved on the rotating shaft 100. At least two inwardly protruding ring portions 511 are formed on the inner peripheral wall of the shaft sleeve 51, and the ring portions 511 are axially spaced from each other. For example, two ring portions 511 are located at the axial ends of the shaft sleeve 51. The inner diameter of the ring portion 511 is substantially equal to the outer diameter of the rotating shaft 100, so that the moving ring seat sleeve 1 contacts the rotating shaft 100 only through the ring portion 511. This structure can reduce the resistance of the moving ring seat sleeve 1 to axially slide on the rotating shaft 100.

[0115] A plurality of radially through holes 52 are formed in the rear end portion of the shaft sleeve 51 for screwing in the corresponding fastening screws 17. A circumferential groove 53 is formed in the inner wall surface of the front end portion of the shaft sleeve 51 for placing the O-ring 48.

[0116] The moving ring seat sleeve 1 further includes a flange 54 extending backward from the front end of the shaft sleeve 51. The flange 54 surrounds the front end of the shaft sleeve 51, thereby defining a groove 55 between the inner peripheral wall of the flange 54 and the outer peripheral wall of the front end of the shaft sleeve 51. At the rear side of the groove 55, a groove 57 with an increased radial dimension is formed for placing the O-ring 47. In the bottom of the groove 55, a plurality of axially extending positioning pin grooves 58 are formed for inserting the front portions of the corresponding positioning pins 3 therein.

[0117] See Figure 17, the dynamic seal ring 2 is annular, defining an axially through hole, the inner diameter of which is slightly larger than the outer diameter of the shaft sleeve 51. The dynamic seal ring 2 includes a cylindrical body 61 and a flange 621 radially extending outward at the rear end of the cylindrical body 61. The outer diameter of the flange 621 is substantially equal to the outer diameter of the flanging 54 of the dynamic ring seat sleeve 1. A plurality of positioning grooves 63 are formed in the front end of the cylindrical body 61 for receiving the rear portions of the corresponding positioning pins 3. The positioning grooves 63 can radially penetrate the front end of the cylindrical body 61.

[0118] Between the flange 621 and the cylindrical body 61, a transition step 622 is formed.

[0119] When installing the dynamic seal ring 2 onto the dynamic ring seat sleeve 1 to form a dynamic ring, the O-ring 47 is sleeved on the cylindrical body 61, and then the dynamic seal ring 2 is sleeved on the shaft sleeve 51 from the rear end of the shaft sleeve 51 and slides forward, so that the cylindrical body 61 is inserted forward from the axial rear side into the annular groove 55 of the dynamic ring seat sleeve 1. The flange 621 faces the rear end face of the flanging 54, but there is a very small gap between it and the rear end face of the flanging 54. The O-ring 47 is clamped between the transition step 622 and the bottom of the annular groove 57.

[0120] See Figure 18 , the static ring seat 5 is generally annular, having a central axial through hole. An internal seal ring groove 521 is defined in the static ring seat 5 for receiving the O-ring 18. In addition, an annular groove 522 is formed on the axial rear side of the seal ring groove 521. An annular groove 523 is formed on the axial rear side of the annular groove 522. The diameter of the annular groove 523 is larger than that of the annular groove 522, and the annular groove 523 opens to the rear end face of the static ring seat 5.

[0121] In addition, a radially inwardly extending flushing hole 68 is formed on the outer peripheral surface of the static ring seat 5. The radially inner end of the flushing hole 68 is not communicated with the central axial through hole of the static ring seat 5, but is communicated to the front end face of the static ring seat 5 through the through hole 524. The radially outer section of the flushing hole 68 is a threaded hole, and a plug can be used to close the flushing hole 68 here. A threaded hole 525 is formed on the rear end face of the static ring seat 5 for screwing in the bolt 81. An axially through hole (not shown) is also formed in the static ring seat 5 for passing through the bolt 11. In addition, in order to make room for the installation of the bolt 10, a notch 526 is provided on the outer periphery of the static ring seat 5 at the corresponding position.

[0122] See Figure 19 , the static seal ring 4 is annular, including a cylindrical body 41 and a circumferential convex ring portion 422 with an increased diameter relative to the cylindrical body 41 at the rear side of the cylindrical body 41. The diameter of the convex ring portion 422 is smaller than the diameter of the annular groove 522. An axial through hole 43 and a groove 44 with a larger diameter relative to the through hole 43 are formed inside the static seal ring 4 in the front side of the through hole 43. Corresponding to the groove 44, a thinned axial convex ring portion 421 is formed at the front part of the cylindrical body 41. The inner diameter of the through hole 43 is slightly larger than the outer diameter of the shaft sleeve 51.

[0123] A number of positioning grooves 46 are formed in the rear end face of the cylindrical body 41 for receiving the front portions of the corresponding positioning pins 7. The positioning grooves 46 can radially penetrate through the corresponding portions of the cylindrical body 41.

[0124] When the static seal ring 4 is installed on the static ring seat 5 to form a static ring, the O-ring 18 is placed in the seal ring groove 521, and the rear portion of the cylindrical body 41 is inserted axially backward from the front side into the central axial through-hole of the static ring seat 5, and the convex ring portion 422 is partially located in the ring groove 522. The front end face of the convex ring portion 421 abuts against the rear end face of the dynamic seal ring 2.

[0125] See Figure 20 , the gland 8 is a generally annular integral part, which defines an internal axial through-hole 701 and a ring groove 702 with an enlarged diameter at the rear side of the internal axial through-hole 701. An axial convex ring portion 711 is formed around the internal axial through-hole 701 on the front end face of the gland 8. The convex ring portion 711 is used for insertion into the equipment housing 101. A seal ring groove 712 is formed in the front end face of the gland 8 for receiving the O-ring 102. A seal ring groove 70 is formed in the rear end face of the gland 8 for receiving the O-ring 19. A number of through-holes 71 penetrating through in the front and rear directions are formed in the peripheral portion of the gland 8 for being penetrated by the corresponding bolts 10.

[0126] The diameter of the internal axial through-hole 701 is larger than the outer diameters of the flanging 54 of the dynamic ring seat sleeve 1 and the flange 621 of the dynamic seal ring 2. In Figure 15 the assembled state shown, the rear portion of the flanging 54 of the dynamic ring seat sleeve 1 and the flange 621 of the dynamic seal ring 2 are generally located in the internal axial through-hole 701. The liquid in the equipment housing 101 can enter the ring groove 702 through the gap between the inner periphery of the gland 8 and the outer peripheries of the dynamic ring seat sleeve 1 and the dynamic seal ring 2. The ring groove 702 communicates with the through-hole 524 in the static ring seat 5.

[0127] See Figure 21 , the spring seat 80 is a generally annular integral part, including a cylindrical body, which defines an internal axial through-hole 87. The inner diameter of the through-hole 87 is slightly larger than the outer diameter of the shaft sleeve 51.

[0128] An enlarged hole portion 92 with an increased diameter is formed in the front portion of the through-hole 87. The enlarged hole portion 92 defines a convex ring portion 93 extending axially forward from the front end face of the cylindrical body and a front-facing step surface 94 critical to the through-hole 87. The convex ring portion 93 is used for insertion into the ring groove 523 of the static ring seat 5 so that the front end face of the cylindrical body is mounted against the rear end face of the static ring seat 5. A number of spring slots 95 extending axially backward are formed in the step surface 94 for placing the rear portions of the corresponding springs 6. The front portions of the springs 6 abut against the rear end face of the static seal ring 4.

[0129] The cylindrical body of the spring seat 80 is also formed with a plurality of axially penetrating through holes 90 for bolts 81 to pass through. A plurality of screw holes (not shown) are formed in the rear end face of the spring seat 80 for screwing the corresponding bolts 15 therein. A plurality of arc-shaped slots 97 are also formed in the rear end face of the spring seat 80 for inserting the front positioning protrusions of the corresponding positioning blocks 14 therein to achieve the positioning of the positioning blocks 14 relative to the spring seat 80.

[0130] During installation, the stationary ring is fixed to the equipment housing 101 by the gland 8, and the rotating ring is fixed to the rotating shaft 100 by the rotating ring seat sleeve 1 and the locking ring. Under the axial forward thrust of the spring 6, the front end face of the static seal ring 4 presses against the rear end face of the dynamic seal ring 2.

[0131] The dynamic seal ring 2, the static seal ring 4, the stationary ring seat 5, and the spring seat 80 are arranged around the bushing 51 of the rotating ring seat sleeve 1 in sequence. The bushing 51 has a sufficient axial length such that, when carrying the dynamic seal ring 2, the static seal ring 4, the stationary ring seat 5, and the spring seat 80, the rear end portion of the bushing 51 protrudes from the stationary ring seat 5 and is inserted into the locking ring 13. The rotating ring seat sleeve 1 is fastened to the rotating shaft 100 by the fastening screw 17. The locking ring 13 and the spring seat 80 are axially locked by the positioning block 14 and the bolt 15. The locking ring 13 can rotate relative to the positioning block 14 and the spring seat 80 but cannot move axially.

[0132] Figure 22 Another exemplary embodiment of the assembled mechanical seal device for liquids is shown. The similarities between this embodiment and Figures 1 - 10 the shown embodiment are that no spring seat is used, and the differences lie in the position changes of the rotating ring seat sleeve 1 and the spring.

[0133] Specifically, as Figure 22 shown, the rotating ring seat sleeve 1 includes a bushing 51 and a rotating ring seat 1A arranged around the bushing 51 and axially displaceable relative to the bushing 51. In other words, the rotating ring seat 1A is a separate component, including a front end portion, a body, and a rear end portion. A protrusion radially protruding outward relative to other parts of the bushing 51 is formed at the front end portion of the bushing 51. A first annular groove for placing the O-ring 48 is formed in the inner wall surface of the protrusion, and a second annular groove for placing another O-ring 48A is formed in the outer wall surface of the protrusion. Among them, the front end portion of the rotating ring seat 1A is seated on the protrusion by means of another O-ring 48A.

[0134] At the front end of the bushing 51, there are also formed: a plurality of spring slots 55A extending axially forward for accommodating the front portions of the corresponding springs 6A, and the rear portions of the springs 6A will push against the body end face of the moving ring seat 1A lower than it; and a plurality of positioning pin holes extending axially forward for inserting the front portions of the corresponding positioning pins 3A into the plurality of positioning pin holes, and the rear portions of the positioning pins 3A will be inserted into the holes correspondingly provided in the body of the moving ring seat 1A to ensure that the moving ring seat 1A rotates together with the bushing 51.

[0135] On the other hand, at the rear end of the moving ring seat 1A, it is configured to support the dynamic sealing ring 2 as described above. The end face of the dynamic sealing ring 2 is in contact with the end face of the static sealing ring 4 by means of the axial thrust exerted by the spring 6A on the body end of the moving ring seat 1A.

[0136] In this embodiment, when overhauling and maintaining the sealing device (the positioning block 14 is no longer included), loosen the bolt 11 to release the static ring seat 5 from the gland 8, so that either the static ring seat 5 supporting the static sealing ring 4 or the moving ring seat 1A supporting the dynamic sealing ring 2 can slide backward along the rotating shaft 100 to separate from the gland 8, thereby separating the dynamic sealing ring 2 and the static sealing ring 4 forming the sealing interface and exposing them to the air respectively. In this way, the dynamic sealing ring 2, the static sealing ring 4, and the spring 6 can be inspected and replaced if necessary.

[0137] In addition, in the various embodiments described above with reference to Figures 1 to 14 and Figure 22 the static sealing ring 4 includes a cylindrical body 41 and a front side convex ring portion 42. Therefore, during overhaul and maintenance, after the static ring seat is released and moves backward to be exposed, if the static sealing ring 4 needs to be replaced, the static sealing ring 4 needs to be moved forward relative to the static ring seat 5 and pulled out. In the embodiment described with reference to Figures 15 to 21 the static sealing ring 4 includes a cylindrical body 41 and a circumferential convex ring portion 422 at the rear side. Therefore, after removing the bolt 81 to separate the spring seat 80 from the static ring seat 5, the static sealing ring 4 can be moved backward relative to the static ring seat 5 and pulled out. In this way, the overhaul and replacement of the static sealing ring 4 are further simplified and facilitated.

[0138] In addition, in the embodiments described above with reference to Figures 1 - 10 the body of the static ring seat 5 is inserted into the gland 8; in the embodiments described above with reference to Figures 11 - 14 the body of the static ring seat 5 is inserted into the gland 8, and the body of the spring seat 80 is inserted into the static ring seat 5; in the embodiment described with reference to Figures 15 - 21 the body of the static ring seat 5 is installed at the rear side of the gland 8, and the body of the spring seat 80 is installed at the rear side of the static ring seat 5; in the embodiment described with reference to Figure 22In the described embodiment, the body of the stationary ring seat 5 is installed at the rear side of the gland 8. At this point, the structure of this embodiment is different from the embodiments described above. It can be understood that for Figures 1 - 10 and Figure 22 the shown embodiments, it can also be designed to install the body of the stationary ring seat 5 at the rear side of the gland 8; for Figures 11 - 14 the shown embodiment, it can also be designed to install the body of the stationary ring seat 5 at the rear side of the gland 8, and / or install the body of the spring seat 80 at the rear side of the stationary ring seat 5; for Figures 15 - 21 and Figure 22 the shown embodiments, it can also be designed to insert the body of the stationary ring seat 5 into the gland 8, and / or insert the body of the spring seat 80 into the stationary ring seat 5.

[0139] It should be noted that the structures and features in different embodiments described in this application can be used interchangeably. For example, the moving ring in a certain embodiment can be used in combination with the stationary ring (including the spring seat) in other embodiments.

[0140] Although some specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of this application. Those skilled in the art should understand that the sealing device in the above embodiments can be modified without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A containerized mechanical seal device for liquids, which is used to seal a rotating shaft passing through a device housing, so that the liquid in the device housing is sealed relative to the outside air. The containerized mechanical seal device for liquids includes: A gland (8), a dynamic ring seat sleeve (1), a dynamic seal ring (2), a static ring seat (5), a static seal ring (4), and a locking ring (13) installed around the rotating shaft, where: The gland (8), the dynamic ring seat sleeve (1), and the static ring seat (5) are each an integral single-piece structure; The gland (8) is fastened to the rear wall surface of the device housing; The front end of the dynamic ring seat sleeve (1) close to the liquid supports the dynamic seal ring (2) by means of a first elastic sealing O-ring (47). The rear end of the dynamic ring seat sleeve (1) away from the liquid extends through the gland (8), and the locking ring (13) surrounds the rear end of the dynamic ring seat sleeve (1) to fasten the dynamic ring seat sleeve (1) to the rotating shaft; The rear end of the static ring seat (5) is fastened to the rear end face of the gland (8), and the inner peripheral surface of the static ring seat (5) close to the liquid supports the static seal ring (4) by means of a second elastic sealing O-ring (18); The end face of the dynamic seal ring (2) is fitted to the end face of the static seal ring (4) by means of a spring (6) to form a sealing interface perpendicular to the axis of the rotating shaft. Among them, the convex ring portion (42) of the static seal ring (4) is pushed forward against the rear end face of the dynamic seal ring (2) under the action of the axial force applied by the spring (6); In a state where the static ring seat (5) is released from the gland (8), the dynamic ring seat (1A) of the dynamic ring seat sleeve (1) or the static ring seat (5) can slide out along the rotating axis to the side away from the liquid to separate from the gland (8), so as to separate the dynamic seal ring (2) and the static seal ring (4) forming the sealing interface and expose them to the outside air respectively.

2. The containerized mechanical seal device for liquids according to claim 1, wherein, One or both of the dynamic seal ring (2) and the static seal ring (4) have a split structure, and the split line is perpendicular to the axis of the rotating shaft.

3. The containerized mechanical seal device for liquid according to claim 1 or 2, wherein, One or both of the first elastic sealing O-ring (47) and the second elastic sealing O-ring (18) have a split structure.

4. The containerized mechanical seal device for liquids according to claim 1 or 2, wherein, It further includes a spring seat (80). The spring seat (80) is installed around the rear end of the dynamic ring seat sleeve (1), fastened to the static ring seat (5), and holes for receiving the spring (6) are provided at the front ends of the spring seat (80). In a state where the spring seat (80) is released from the static ring seat (5), the spring seat (80) can slide out along the rotating axis to the side away from the liquid to separate from the static ring seat (5), so as to expose the spring (6) to the outside air.

5. The containerized mechanical seal device for liquids according to claim 1 or 2, wherein, The dynamic ring seat sleeve (1) includes a sleeve (51) around the rotating shaft, and holes (55A) for receiving the spring are provided at the front ends of the sleeve (51); And among them, the dynamic ring seat (1A) is installed around the sleeve (51), the front end of the dynamic ring seat (1A) is pushed by the spring, and the rear end of the dynamic ring seat (1A) supports the dynamic seal ring (2).

6. The containerized mechanical seal device for liquids according to claim 1 or 2, wherein, A flushing hole (68) penetrating radially is formed in the gland (8), and a circumferential groove (34) is formed on the outer peripheral surface of the stationary ring seat (5). The bottom of the groove (34) communicates with the front end face of the stationary ring seat (5) through a plurality of axial through holes (35), and the inner end of the flushing hole (68) communicates with the groove (34); or A flushing hole (68) extending radially inward is formed on the outer peripheral surface of the stationary ring seat (5), and the radially inner end of the flushing hole (68) communicates with the front end face of the stationary ring seat (5) through a through hole (524).

7. The containerized mechanical seal device for liquid according to claim 1 or 2, wherein, The stationary seal ring (4) is configured to be movable forward relative to the stationary ring seat (5) and separated from the stationary ring seat (5); or The stationary seal ring (4) is configured to be movable backward relative to the stationary ring seat (5) and separated from the stationary ring seat (5).

8. The assembled mechanical seal device for liquid according to claim 1 or 2, further comprising a detachable positioning block (14), and the locking ring (13) is rotatably positioned relative to the positioning block (14) to assemble the gland (8), the moving ring seat sleeve (1), the driven ring seat sleeve (1), the dynamic seal ring (2) supported by the first elastic sealing O-ring, the stationary ring seat (5), the stationary seal ring (4) supported by the second elastic sealing O-ring by the stationary ring seat (5), and the spring (6) together to form an assembled mechanical seal.

9. The containerized mechanical seal device for liquid according to claim 1 or 2, wherein, The spring (6) is configured as a small cylindrical coil spring.

10. The containerized mechanical seal device for liquid according to claim 4, wherein, The stationary ring seat (5) is fastened to the rear end face of the gland (8) by inserting the body of the stationary ring seat (5) into the gland (8) or by mounting the body of the stationary ring seat (5) on the rear end face of the gland (8). And wherein, the spring seat (80) is fastened to the rear end face of the stationary ring seat (5) by inserting the body of the spring seat (80) into the stationary ring seat (5) or by mounting the body of the spring seat (80) on the rear end face of the stationary ring seat (5).

Images