Main shaft rotation rubber active pressure water sealing device of water turbine

Abstract

The utility model discloses a water turbine main shaft rotating rubber active pressure water sealing device which comprises a rotating metal ring, a metal annular sealing seat and a rubber sealing ring, and the rotating metal ring is coaxial with a main shaft and detachably and fixedly connected with the main shaft. The rotary metal ring and the metal annular sealing seat are oppositely arranged; a sealing seat ring groove is formed in one side, facing the rotating metal ring, of the metal ring-shaped sealing seat; the upper end of the rubber sealing ring is fixedly connected with the lower side of the rotating metal ring, and the lower part is arranged in the sealing seat ring groove; the width of the axial section of the base body part of the rubber sealing ring is smaller than that of the rectangular section ring groove of the sealing seat; the lower end of the rubber sealing ring is provided with a rubber sealing ring groove, and an inner rotary sealing working ring belt and an outer rotary sealing working ring belt which are symmetrically arranged on two sides of the rubber sealing ring groove; and the inner and outer rotary sealing working ring belts are respectively attached to the inner and outer ring surfaces of the sealing seat ring groove under water pressure and are in rotary movable fit with the inner and outer ring surfaces during working. The sealing device has the advantages of being simple in structure, safe, reliable and capable of guaranteeing the sealing effect.

Description

Technical Field

[0001] The utility model relates to the field of working seals for a water turbine main shaft, in particular to a rotating rubber active pressure water sealing device for a water turbine main shaft. Background Art

[0002] The turbine main shaft piston rubber end face seal is a widely used turbine working seal. This seal structure mainly consists of three parts: a rotating metal ring (disc-shaped rotating metal ring), an annular rubber seal ring, and a metal annular seal seat with an annular groove structure and water tank function.

[0003] like Figure 1 The figure shows the structure and operating mode of a conventional turbine main shaft piston rubber end face seal. In the figure: 1 is the turbine main shaft; 2 is a split (assembled) rotating metal ring mounted on the main shaft 1; 3 is a detachable stainless steel annular wear plate mounted below the rotating metal ring disc; 4 is a rubber seal ring installed in the seal seat groove of the metal annular seal seat and capable of only axial upward and downward movement, but not rotation; 5 is a metal annular seal seat with an annular groove structure and active pressure water inlet structure, which, when installed, forms a closed water tank; 501 is a number of stop pins mounted on the metal annular seal seat 5, which engage with corresponding stop pin holes in the rubber seal ring 4 to prevent rotation. The metal annular seal seat 5 is provided with a seal seat water supply hole 52 that connects to the seal seat groove 51.

[0004] During operation, the rubber seal ring 4 of the turbine main shaft piston-type rubber end face seal rises under the action of the pressurized water 6 in the seal seat ring groove 51 of the metal annular seal seat 5 and moves to the position where it mates with the working plane (end face) of the stainless steel annular anti-wear plate 3 of the rotating metal ring 2, thereby forming a dynamic sealing relationship on the end plane and sealing against leaking water 7;

[0005] The existing turbine main shaft piston rubber end face seal adopts a design that directly uses nitrile rubber (NBR) and other rubber materials as the dynamic sealing material due to its structural design. Since rubber materials have a high friction coefficient, high elasticity, low hardness, and are non-thermal conductive materials, once contact friction occurs during operation and poor cooling and lubrication occur, it is easy to cause a burning accident. Therefore, this seal requires sufficient water cooling and lubrication.

[0006] The existing technology of turbine main shaft piston rubber end face seal adopts a design of providing a plurality of axial pressure water supply holes on the rubber sealing ring (ring) to inject pressurized water into the annular groove on the working end face of the rubber sealing ring and supply water to the inner and outer end planes of the dynamic sealing match to solve the problem of lubrication and cooling of the dynamic sealing match end face.

[0007] like Figure 1 As shown, in actual use, due to the large friction of the rubber sealing ring 4, the upper end surface of the rubber sealing ring 4 and the lower end surface of the stainless steel annular anti-wear plate 3 are often worn continuously, resulting in the rubber sealing ring 4 suddenly jumping like a spring when adjusting its position up and down, and there is a risk of excessive movement; when this happens, because the rubber sealing ring 4 is too close to the stainless steel annular anti-wear plate 3 of the rotating metal ring 2, the cooling and lubricating water between the sealing mating surfaces is squeezed out, causing the rubber sealing ring 4 made of nitrile rubber with low heat resistance to directly contact and rub with the annular anti-wear plate 3, and burn due to the high friction heat.

[0008] Because rubber seals essentially utilize the high elasticity, deformation, and wear resistance of rubber materials, while also exhibiting significant dimensional instability and volatility, the more complex their structure and the more functions they perform, the more difficult it is to calculate and control their operating conditions. This creates a constant risk of burnout due to fluctuations in operating parameters.

[0009] The aforementioned situation makes it difficult to achieve automatic control and information management for existing turbine main shaft piston rubber end seals, forcing the company to adopt a management model centered on empirical maintenance and manual intervention. This model of management uncertainty, with firefighters constantly on standby, fails to address the root cause and occupies maintenance resources. Summary of the Invention

[0010] The purpose of this utility model is to provide a turbine main shaft rotating rubber active pressure water sealing device with a simple structure, safety and reliability, guaranteed sealing effect, and capable of meeting a remote monitoring and management mode with few or no people on duty maintenance and long-term safe operation in response to the shortcomings of the existing technology.

[0011] The technical objectives of the present invention are achieved through the following technical solutions:

[0012] The cam is secured to the cam face and is designed to engage the cam face of the piston rod, wherein the cam face is secured to the piston rod and is in a position to engage the cam face of the piston rod, wherein the cam face is secured to the piston rod and is in a position to engage the cam face of the piston rod.

[0013] Preferably, the height of the inner rotating sealing working annular belt and the outer rotating sealing working annular belt is less than 30 mm.

[0014] Preferably, a positioning groove is provided on the lower side of the rotating metal ring to cooperate with the upper end of the rubber sealing ring.

[0015] Preferably, an aluminum alloy outer ring and an aluminum alloy inner ring are connected to the lower side of the rotating metal ring; the aluminum alloy outer ring and the aluminum alloy inner ring are spaced apart to form the positioning groove.

[0016] Preferably, the rotating metal ring is detachably connected to the aluminum alloy outer ring and the aluminum alloy inner ring.

[0017] Preferably, the outer ring surface and the inner ring surface of the sealing seat ring groove are provided with a wear-resistant coating material that reduces wear.

[0018] Preferably, the inner rotating seal working ring belt and the outer rotating seal working ring belt are respectively provided with a plurality of radial pressure lubrication water holes and radial self-lubricating holes on the circumference thereof, which are connected to the seal seat ring groove, and self-lubricating graphite columns are provided in the radial self-lubricating holes.

[0019] Preferably, the upper end surface of the rotating metal ring is evenly distributed with multiple screw holes along the circumferential direction, and the screw holes penetrate the upper end surface and the lower end surface of the rotating metal ring; connecting bolts are provided in the screw holes, and the upper end surface of the rubber sealing ring is provided with connecting screw holes for cooperating with the connecting bolts, and the rotating metal ring and the rubber sealing ring are bolted.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This utility model improves the existing sealing relationship between the rubber sealing ring and the rotating metal ring in the turbine main shaft piston rubber end seal. This eliminates the problem of continuous wear between the upper end face of the rubber sealing ring and the lower end face of the stainless steel annular anti-wear plate, which causes the rubber sealing ring to move up and down like a spring when adjusting its position. It also avoids the problem of direct friction between the rubber sealing ring and the stainless steel annular anti-wear plate, which can cause it to burn due to high friction heat. This technical measure has a simple structure, is safe and reliable, and ensures a good sealing effect. It can meet the needs of remote monitoring and management in a maintenance mode with few or no personnel, and can also meet the long-term safe operation.

[0022] 2. The inner and outer rotating seal working rings of this utility model are each circumferentially equipped with multiple radial pressure lubrication holes connected to the seal seat grooves and multiple self-lubricating graphite columns. This technical measure ensures that the inner and outer rotating seal working rings and the inner and outer surfaces of the seal seat grooves are adequately adhered to, lubricated, and protected by graphite molecules, forming an excellent non-contact seal and reducing friction and wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the prior art;

[0024] Figure 2 It is a structural diagram of the utility model;

[0025] Figure 3 yes Figure 2 Schematic diagram of the structure of the rotating metal ring, the aluminum alloy inner ring and the aluminum alloy outer ring;

[0026] Figure 4 yes Figure 2 Schematic diagram of the structure of the rubber sealing ring and screw;

[0027] Figure 5 yes Figure 4 Schematic diagram of the middle AA direction;

[0028] Figure 6 yes Figure 4 Schematic diagram of the middle BB direction;

[0029] Figure 7 yes Figure 2 A top view of the rotating metal ring;

[0030] Reference numerals: 1—main shaft;

[0031] 2—rotating metal ring; 21—screw hole; 22—nut hole; 23—screw;

[0032] 3—stainless steel annular anti-wear plate;

[0033] 31—aluminum alloy inner ring; 32—aluminum alloy outer ring;

[0034] 301—positioning groove;

[0035] 4—rubber sealing ring; 41—rubber sealing ring groove;

[0036] 401—inner rotating seal working ring belt; 402—outer rotating seal working ring belt;

[0037] 403—Radial pressure lubrication water hole; 404—Radial self-lubricating hole;

[0038] 5—metal annular sealing seat; 51—seal seat ring groove; 52—seal seat water supply hole; 501—limit pin;

[0039] 6—active pressure water; 7—leakage water;

[0040] 8—screw assembly; 81—screw; 82—nut; 83—washer. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0043] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0044] like Figure 1 — Figure 7 As shown, a hydraulic turbine main shaft rotating rubber active pressure water sealing device includes a rotating metal ring 2, a metal ring sealing seat 5 and a rubber sealing ring 4. The rotating metal ring 2 is coaxial with the main shaft 1 and is detachably fixedly connected to the main shaft 1; the rotating metal ring 2 and the metal ring sealing seat 5 are arranged opposite to each other; the metal ring sealing seat 5 is provided with a sealing seat ring groove 51 on the side facing the rotating metal ring 2; the upper end of the rubber sealing ring 4 is fixedly connected to the lower side of the rotating metal ring 2, and the lower part is arranged in the sealing seat ring groove 51; the base of the rubber sealing ring 4 Part, the width of its axial section is smaller than the width of the rectangular cross-section ring groove of the sealing seat, and it does not fit in with the sealing seat ring groove 51 at all during sealing operation; the lower end of the rubber sealing ring 4 is provided with a rubber sealing ring groove 41 and an inner rotating sealing working ring belt 401 and an outer rotating sealing working ring belt 402 symmetrically arranged on both sides of the rubber sealing ring groove 41; the inner rotating sealing working ring belt 401 and the outer rotating sealing working ring belt 402 are respectively fitted with the inner ring surface and the outer ring surface of the sealing seat ring groove 51 under water pressure and rotate in operation.

[0045] During operation, the turbine's main shaft 1 drives the rotating metal ring 2 and the rubber seal 4 fixed to its underside to rotate together. The inner and outer rotating seal bands 401 and 402 at the lower ends of the rubber seal 4, respectively, contact the inner and outer surfaces of the seal seat groove 51 under water pressure and rotate in unison during operation. This technical solution improves the dynamic and static sealing relationship between the rubber seal 4 and the rotating metal ring 2 in the conventional piston-type rubber end seal on the turbine's main shaft 1. This prevents the continuous wear between the upper end of the rubber seal 4 and the lower end of the stainless steel annular wear plate 3, which can cause the rubber seal 4 to move up and down like a spring when adjusting its position. Furthermore, it avoids the problem of direct contact and friction between the rubber seal 4 and the stainless steel annular wear plate 3, which can cause burns due to high friction heat. This technical solution offers a simple structure, safety, reliability, and guaranteed sealing performance. It also supports remote monitoring and management with minimal or no human supervision, ensuring long-term safe operation.

[0046] like Figure 2 — Figure 7 As shown, the underside of the rotating metal ring 2 is provided with a positioning groove 301 that mates with the upper end of the rubber sealing ring 4. In actual use, the underside of the rotating metal ring 2 is connected to an aluminum alloy outer ring 32 and an aluminum alloy inner ring 31. The positioning groove 301 is formed between the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31. The aluminum alloy outer ring 32 and the aluminum alloy inner ring 31 can be made of high-strength aviation aluminum alloy. The rubber sealing ring 4 can be made of a rubber material with a hardness no greater than 80 Shore A (Shoe) hardness. The aluminum alloy inner and outer rings form an annular positioning groove 301, facilitating quick positioning during installation of the rubber sealing ring 4 and improving installation efficiency. This technical solution offers the advantages of a simple structure and improved installation efficiency. Furthermore, the use of the lower-specific-gravity aluminum alloy inner and outer rings reduces weight. When installed on the underside of the rotating metal ring 2, the combined weight of the inner and outer rings and the rotating metal ring 2 is effectively reduced, effectively facilitating on-site installation.

[0047] like Figure 2 、 Figure 3 、 Figure 7As shown, the rotating metal ring 2 is detachably connected to the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31. In actual use, the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31 can be welded or bonded to the underside of the rotating metal ring 2. However, a fixed connection does not facilitate the replacement of the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31. Therefore, the rotating metal ring 2 is detachably connected to the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31. Common detachable connection structures include screw connections, bolt connections, etc. For example, the upper end surface of the rotating metal ring 2 is uniformly distributed along the circumference with through holes penetrating its upper and lower ends. Screw holes for connection corresponding to the positions of the through holes are provided on the upper end surfaces of the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31. The rotating metal ring 2 is connected to the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31 by screws 23. This technical measure facilitates the replacement of the aluminum alloy outer ring 32 and the aluminum alloy inner ring 31.

[0048] like Figure 2 As shown, the upper end of the rubber sealing ring 4 is fixedly connected to the underside of the rotating metal ring 2, and its lower portion is disposed within the sealing seat ring groove 51. Specifically, the rubber sealing ring 4 comprises an upper base portion and lower inner and outer rotating sealing working ring bands 401, 402. A rubber sealing ring groove 41 is defined at the lower end of the rubber sealing ring 4. The inner and outer rotating sealing working ring bands 401, 402 are symmetrically disposed on either side of the rubber sealing ring groove 41. In actual use, the height of the inner and outer rotating sealing working ring bands 401, 402 is less than 30 mm.

[0049] The inner and outer ring diameters of the base portion of the rubber sealing ring 4 are smaller than the inner and outer ring diameters of the sealing seat groove 51, respectively. That is, the cross-sectional width of the base portion of the rubber sealing ring 4 is smaller than the cross-sectional width of the sealing seat groove 51. During operation, the base portion of the rubber sealing ring 4 does not contact the inner and outer ring surfaces of the sealing seat groove 51. The inner rotating seal working band 401 and the outer rotating seal working band 402 at the bottom of the rubber sealing ring 4 respectively mate with the inner and outer ring surfaces of the sealing seat groove 51. Specifically, the axial cross-sectional width of the base portion of the rubber sealing ring 4 is smaller than the width of the rectangular cross-sectional ring groove of the sealing seat, and thus does not mate with the sealing seat groove 51 at all during sealing operation. The inner rotating seal working band 401 and the outer rotating seal working band 402 respectively mate with the inner and outer ring surfaces of the sealing seat groove 51 under water pressure and rotate in engagement during operation.

[0050] like Figure 2 — Figure 6As shown, the inner rotating seal working ring belt 401 and the outer rotating seal working ring belt 402 are respectively provided with a plurality of radial pressure lubrication water holes 403 and a plurality of self-lubricating graphite columns on their circumferences, which are connected to the seal seat ring groove 51. In actual use, the inner rotating seal working ring belt 401 and the outer rotating seal working ring belt 402 are respectively provided with a plurality of radial pressure lubrication water holes 403 and radial self-lubricating holes 404 on their circumferences, which are connected to the seal seat ring groove 51. Self-lubricating graphite columns are provided in the radial self-lubricating holes 404. In actual use,

[0051] Self-lubricating graphite cylinders are made of a self-lubricating material containing carbon fibers. These cylinders can be made of carbon fiber graphite cylinders or specialized carbon fiber self-lubricating graphite cylinders. Due to the high strength and excellent solid lubrication properties of carbon fiber, they are more effective than conventional solid lubricants in ensuring the reliable, long-term operation of friction-pairing machinery such as solid self-lubricating bearings and seals.

[0052] During operation, the inner rotating seal working band 401 and the outer rotating seal working band 402 adhere to the inner and outer ring surfaces of the seal seat ring groove 51 under water pressure and rotate in conjunction with each other. During use, friction forms between the inner rotating seal working band 401 and the outer rotating seal working band 402 and the inner and outer ring surfaces of the seal seat ring groove 51. Multiple radial pressure lubrication water holes 403 and multiple self-lubricating graphite columns are circumferentially provided on the inner rotating seal working band 401 and the outer rotating seal working band 402, respectively, and communicate with the seal seat ring groove 51. This technical measure ensures that the inner and outer ring surfaces of the inner rotating seal working band 401 and the outer rotating seal working band 402 and the seal seat ring groove 51 are adequately adhered, lubricated, and protected by graphite molecules, forming a good non-contact seal and reducing friction and wear.

[0053] In actual use, the rotating metal ring 2 and the rubber sealing ring 4 can be fixedly connected by bonding or other methods. In this embodiment, the rotating metal ring 2 and the rubber sealing ring 4 are connected in a detachable manner.

[0054] Specifically, the upper end surface of the rotating metal ring 2 is uniformly distributed with multiple screw holes along the circumference, and the screw holes penetrate the upper and lower end surfaces of the rotating metal ring 2; connecting bolts are provided in the screw holes, and the upper end surface of the rubber sealing ring 4 is provided with connecting screw holes for matching with the connecting bolts, and the rotating metal ring 2 and the rubber sealing ring 4 are bolted together. Figure 2As shown, in actual use, the rotating metal ring 2 and the rubber sealing ring 4 can also be connected using a screw assembly 8, which includes a screw 81, a nut 82, and a washer 83. The upper end surface of the rotating metal ring 2 is uniformly distributed along the circumference with multiple screw holes 21 and nut holes 22. The lower portion of the screw 81 is threadedly connected to the connecting screw hole on the upper end surface of the rubber sealing ring 4, and the upper portion of the screw 81 is connected to the nut 82. The washer 83 is disposed in the nut hole 22. After the nut 82 enters the nut hole 22 and is tightened, the lower end of the nut 82 abuts against the upper end of the washer 83. This technical measure facilitates the replacement of the rubber sealing ring 4.

[0055] The outer and inner surfaces of the sealing seat ring groove 51 are provided with a wear-resistant coating material that reduces wear. In actual use, the rotating metal ring 2 and the metal ring sealing seat 5 are arranged relative to each other in the upper and lower directions. The sealing seat is a metal ring sealing seat 5 made of metal material. The metal ring sealing seat 5 is provided with a sealing seat ring groove 51 on the side facing the rotating metal ring 2; the inner and outer surfaces of the sealing seat ring groove 51 of the metal ring sealing seat 5 are also made of metal. The outer and inner surfaces of the sealing seat ring groove 51 are provided with a wear-resistant coating material that reduces wear, which can increase the service life of the sealing seat ring groove 51. The wear-resistant coating material can be made of thermally sprayed high-hardness tungsten carbide wear-resistant alloy, thermally sprayed Teflon polymer friction-reducing material, etc.

[0056] The above is a detailed introduction to the technical solutions provided by the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A hydraulic turbine main shaft rotating rubber active pressure water sealing device, characterized in that , including a rotating metal ring, a metal ring sealing seat and a rubber sealing ring, The rotating metal ring is coaxial with the main shaft and is detachably fixedly connected to the main shaft; The rotating metal ring and the metal annular sealing seat are arranged opposite to each other; The metal annular sealing seat is provided with a sealing seat ring groove on the side facing the rotating metal ring; The upper end of the rubber sealing ring is fixedly connected to the lower side of the rotating metal ring, and the lower part thereof is arranged in the sealing seat ring groove; The width of the axial cross section of the base of the rubber sealing ring is smaller than the width of the rectangular cross section ring groove of the sealing seat, and does not fit in the ring groove of the sealing seat at all during sealing operation; The lower end of the rubber sealing ring is provided with a rubber sealing ring groove and an inner rotating sealing working ring belt and an outer rotating sealing working ring belt symmetrically arranged on both sides of the rubber sealing ring groove; The inner rotary seal working ring belt and the outer rotary seal working ring belt are respectively attached to the inner ring surface and the outer ring surface of the seal seat ring groove under water pressure and rotated in cooperation during operation.

2. The turbine main shaft rotating rubber active pressure water sealing device according to claim 1, characterized in that: The heights of the inner rotating seal working annular belt and the outer rotating seal working annular belt are less than 30 mm.

3. The turbine main shaft rotating rubber active pressure water sealing device according to claim 1, characterized in that The lower side of the rotating metal ring is provided with a positioning groove that cooperates with the upper end of the rubber sealing ring.

4. The turbine main shaft rotating rubber active pressure water sealing device according to claim 3, characterized in that The lower side of the rotating metal ring is connected to an aluminum alloy outer ring and an aluminum alloy inner ring; the aluminum alloy outer ring and the aluminum alloy inner ring are spaced apart to form the positioning groove.

5. The turbine main shaft rotating rubber active pressure water sealing device according to claim 4, characterized in that The rotating metal ring is detachably connected to the aluminum alloy outer ring and the aluminum alloy inner ring.

6. The turbine main shaft rotating rubber active pressure water sealing device according to claim 1, characterized in that The outer ring surface and the inner ring surface of the sealing seat ring groove are provided with a wear-resistant coating material to reduce wear.

7. The turbine main shaft rotating rubber active pressure water sealing device according to claim 1, characterized in that The inner rotating seal working ring belt and the outer rotating seal working ring belt are respectively provided with a plurality of radial pressure lubrication water holes and radial self-lubricating holes on the circumference, which are connected to the sealing seat ring groove, and self-lubricating graphite columns are arranged in the radial self-lubricating holes.

8. The turbine main shaft rotating rubber active pressure water sealing device according to claim 1, characterized in that The upper end surface of the rotating metal ring is evenly distributed with multiple screw holes along the circumferential direction, and the screw holes penetrate the upper end surface and the lower end surface of the rotating metal ring; the screw holes are provided with connecting bolts, and the upper end surface of the rubber sealing ring is provided with connecting screw holes for cooperating with the connecting bolts, and the rotating metal ring and the rubber sealing ring are bolted.

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