Integral oil groove sealing cover structure

Abstract

The utility model discloses an integral oil groove sealing cover structure, which belongs to the technical field of water-turbine generator sets, and comprises an oil groove cover circumferentially arranged around a rotating shaft of a generator, corresponding parts of the oil groove cover and the surface of the rotating shaft form a sealing surface, a gap is reserved between the oil groove cover and the surface of the rotating shaft, and the oil groove cover is of an annular structure; an annular air supply channel and an annular air suction channel are respectively arranged in the oil groove cover; the air supply channel is communicated with an air supply device; and the air suction channel is communicated with an oil mist suction treatment device. The integral type oil groove sealing cover structure can effectively solve the problems that in the prior art, the pressure difference of gas between each upper cavity and each lower cavity of an oil groove sealing cover is large, the requirement for uniformity is difficult to meet, the sealing effect is reduced, and the service life of a sealing ring is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of water turbine generator sets, and specifically relates to an integral oil tank sealing cover structure. Background Art

[0002] The supporting bearings of the main shaft of the hydro-turbine generator set generally use self-lubricating sliding bearings, and the bearing bushes are immersed in lubricating oil. When the unit is running, on the one hand, the lubricating oil is repeatedly stirred and collided in the oil tank, generating a large number of bubbles, which form oil mist after bursting; on the other hand, the oil film on the bearing bush has a higher temperature locally, and the lubricating oil vaporizes at a higher temperature, also forming oil mist. Therefore, for hydro-turbine generators, the generation of oil mist is inevitable, and as the speed of the unit increases, especially the linear speed of large units is higher, the oil splashes everywhere, generating more oil mist, and the severity increases significantly.

[0003] The oil mist escape phenomenon inside the hydropower unit causes the oil mist to escape from the gap between the generator shaft and the oil tank, generating a negative pressure during the operation of the unit. The circulating oil flow in and out of the oil tank is in a turbulent state. The collision and impact between oil molecules and between the moving and static parts and the oil will cause the circulating oil to vaporize and produce oil mist, which overflows through the narrow gap between the generator shaft and the oil tank cover, resulting in a large amount of lubricating oil and oil mist leakage. In order to seal the oil mist generated in the oil tank, as shown in the prior document No. CN203248722U, the anti-oil mist device includes an annular sealing cylinder and a flange-shaped sealing outer body, one end of the sealing cylinder is connected to the inner edge of the sealing outer body by bolts, and the rotating shaft of the generator passes through the sealing cylinder. It is characterized in that a respirator is installed on the sealing outer body, and an oil slinger is installed on the surface of the rotating shaft; an upper chamber and a lower chamber are provided on the inner circumference of the sealing cylinder, and sealing teeth are provided between the upper chamber and the lower chamber and in the sealing grooves on both sides, and an oil mist absorption layer corresponding to the oil slinger is provided on the inner edge of the sealing outer body; an automatic oil mist absorption processing device and an air supply device are installed on the sealing outer body, and an air inlet interface connected to the air supply device is provided in the upper chamber; and an oil mist absorption interface connected to the automatic oil mist absorption processing device is provided in the lower chamber.

[0004] The above-mentioned structural deficiencies are mainly as follows: First, an upper chamber is set on the oil tank cover, and the upper chamber is connected to the air supply device, but each upper chamber is independent, and the gas pressure entering it is determined by its own air supply device, resulting in large pressure fluctuations between the gases in each upper chamber, and the pressure difference between the gap between the rotating shaft and the sealing cylinder and the sealing ring of the gas in each upper chamber is large, and it is difficult to meet the uniformity requirements, thereby reducing the sealing effect and reducing the service life of the sealing ring. Second, the lower chamber set on the oil tank cover is connected to the automatic oil mist treatment device, and each lower chamber is independent. The pressure and speed of the gas sucked are determined by their own automatic oil mist treatment device. The pressure fluctuations of the gas between the lower chambers are large, and the flow rate is difficult to control within a suitable range. The volume of the oil-containing gas in the oil tank flowing into each lower chamber also fluctuates greatly. Third, there are usually more air supply devices and oil mist treatment devices, and there are also more gas pipelines and control lines, which is not convenient for on-site equipment layout. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated oil tank sealing cover structure to solve the problems that the pressure difference between the upper chambers and the lower chambers of the oil tank sealing cover in the prior art is relatively large, which makes it difficult to meet the uniformity requirements, thereby reducing the sealing effect and the service life of the sealing ring. In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An integral oil tank sealing cover structure comprises an oil tank cover arranged circumferentially around a rotating shaft of a generator, wherein the oil tank cover and corresponding parts of the rotating shaft surface form a sealing surface, and a gap is reserved between the two, and the oil tank cover is an annular structure; an annular air supply channel and an air intake channel are respectively arranged in the oil tank cover; the air supply channel is connected to an air supply device; and the air intake channel is connected to an oil mist treatment device.

[0007] Furthermore, the air supplement channel and the air intake channel are arranged vertically along the axial direction of the rotating shaft or left-right along the radial direction of the rotating shaft.

[0008] Furthermore, a plurality of air supply holes are provided along the circumferential direction on one side of the air supply channel facing the rotating shaft; the air supply holes are communicated with the gap between the rotating shaft and the oil tank cover.

[0009] Furthermore, a plurality of suction cavities are circumferentially arranged on one side of the suction channel facing the rotating shaft; the suction cavities are communicated with the gap between the rotating shaft and the oil tank cover.

[0010] Furthermore, a turbulence front baffle is provided at the lower end of the oil tank cover.

[0011] Furthermore, a plurality of through holes are provided on the turbulence front baffle.

[0012] Furthermore, a plurality of suction resistance plates are provided on the gas passage between the suction cavity and the suction channel; the plurality of suction resistance plates enable the gas passage to form a labyrinth structure.

[0013] Furthermore, the front ends of the air supply holes and the air suction cavity facing the rotating shaft are arranged to be downwardly inclined structures.

[0014] Furthermore, a sealing tooth is provided on the surface of the oil tank cover facing the rotating shaft; the sealing tooth is serrated and is coordinated with the air supply hole and the front end of the air suction cavity to be tilted downward.

[0015] Furthermore, the air supplement holes correspond one to one with the air suction cavities.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model provides an annular air supply channel on the oil tank cover, and the air supply holes provided along the circumference are respectively connected to the air supply channel, so that each air supply hole is interconnected through the air supply channel, and the air pressure of each air supply hole is the same or substantially the same. When the air supply device is started, gas for air sealing is introduced into the gap between the rotating shaft and the sealing cover through the air supply hole, so that the pressure of the gas on the gap between the rotating shaft and the sealing cover and the sealing ring is kept constant to meet the uniformity requirement.

[0018] 2. The utility model provides an annular air intake passage on the oil tank cover, and the air intake cavities provided along the circumference are respectively connected to the air intake passages, so that each air intake chamber is interconnected through the air intake passages, and the air pressure of each air intake chamber is the same or substantially the same. When the oil mist treatment device is started to suck the contained gas through the air intake chamber, the suction force of each air intake chamber is the same or substantially the same, and the suction force remains constant, which can meet the uniformity requirement.

[0019] 3. The utility model provides an annular air supply channel and an air intake channel on the oil tank cover. The air supply and air intake pressures are the same or substantially the same, thereby enhancing the sealing effect.

[0020] 4. The turbulence front baffle arranged at the lower end of the oil tank cover has multiple through holes arranged thereon to facilitate the passage of the oil mist in the oil tank, and can prevent the oil in the oil tank from being violently stirred due to the instability of the rotating shaft during operation, so that the oil directly reaches the lower sealing position, so that the oil flows stably and the generation of oil mist is reduced.

[0021] 5. The downwardly inclined sealing teeth cooperate with the downwardly inclined structure of the air supply hole and the front end of the air suction cavity, so that the sealing surface of the oil tank cover of the utility model corresponding to the contact with the shaft forms an overall downwardly inclined matching structure, which can effectively reduce the resistance of replenishment and air suction when the shaft rotates, and the gas flow is smoother, resulting in a better sealing effect.

[0022] 6. The utility model can reduce the number of air supply devices and oil mist treatment devices, especially after the gas pipelines are assembled on the cover plate, the number of gas pipelines arranged is greatly reduced, the safety of equipment operation is improved, and at the same time, great convenience is provided for oil tank maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the matching structure of the rotating shaft and the oil tank cover of the utility model;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 This is a cross-sectional view of the rotating shaft and the oil tank cover of the utility model in the second position;

[0026] Figure 4 This is a cross-sectional view of the rotating shaft and the oil tank cover of the utility model at the third position;

[0027] Figure 5 Schematic diagram of the turbulence front baffle structure.

[0028] In the attached drawings: 1-shaft, 2-oil tank cover, 3-air supply channel, 4-air intake channel, 5-upper sealing ring, 6-lower sealing ring, 7-air supply device, 8-oil mist treatment device, 9-air supply hole, 10-intake cavity, 11-intake resistance plate, 12-turbulence front baffle, 13-through hole, 14-sealing tooth. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The components of the embodiments of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0030] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1:

[0032] See attached Figures 1 to 5 The integral oil tank sealing cover structure of the generator provided in this embodiment cooperates with the rotating shaft 1 of the generator, and is specifically arranged around the circumference of the rotating shaft 1 of the generator. The oil tank cover 2 is arranged around the circumference of the rotating shaft 1, and the oil tank cover 2 covers the lubricating oil tank of the generator to form a closed cover; the oil tank cover 2 forms a sealing surface with the corresponding part of the surface of the rotating shaft 1, and a gap is left between the two, and the oil tank cover 2 cannot block the normal rotation of the rotating shaft 1.

[0033] The oil tank cover 2 of the utility model is an annular structure, in which an annular air supply channel 3 and an air suction channel 4 are respectively arranged. In the height direction (axial direction) of the rotating shaft 1, the air supply channel 3 is usually arranged on the top and the air suction channel 4 is arranged on the bottom, and the two form a structure arranged up and down; or the two form a parallel arrangement structure in the height direction. The upper and lower ends of the oil tank cover 2 are respectively provided with an upper sealing ring 5 and a lower sealing ring 6 to block the gap between the oil tank cover 2 and the rotating shaft 1; the upper sealing ring 5 and the lower sealing ring 6 are usually made of soft materials to form a flexible sealing structure.

[0034] The air supply channel 3 is connected with the air supply device 7. A plurality of air supply holes 9 are circumferentially arranged on the front side of the air supply channel 3 (the side facing the rotating shaft). The air supply holes 9 are connected with the gap between the rotating shaft 1 and the oil tank cover 2. After the air supply device 7 is started, the external gas is transported into the air supply channel 3 by the air supply device 7, and enters the gap between the rotating shaft 1 and the oil tank cover 2 through the air supply holes 9, thereby playing the role of "air sealing".

[0035] The air intake channel 4 is connected to the oil mist treatment device 8. The front side of the air intake channel 4 (the side facing the rotating shaft) is provided with a plurality of air intake cavities 10 along the circumferential direction. The air intake cavities 10 are connected with the gap between the rotating shaft 1 and the oil tank cover 2. After the oil mist treatment device 8 is started, the oil mist treatment device 8 generates a suction effect, and the gas that enters the air intake cavity 10 from the gap between the rotating shaft 1 and the oil tank cover 2 from top to bottom through the air replenishing hole 9, and the gas that enters the air intake cavity 10 from the bottom to top from the oil tank through the lower sealing ring 6, are sucked into the air intake channel 4, and then enter the oil mist treatment device 8, and the oil mist is separated and purified by the oil mist treatment device 8 before being discharged. The oil mist treatment device 8 can use existing equipment, which will not be further introduced here as the existing technology. The air replenishing hole 9 corresponds to the air intake cavity 10 one by one, and is arranged correspondingly to each other, so as to facilitate the introduction of sealed gas into the gap between the oil tank cover 2 and the rotating shaft 1 through the air replenishing hole 9, and also facilitate the suction of the gas contained outward.

[0036] Embodiment 2:

[0037] See attached Figures 1 to 5 The utility model is provided with a plurality of suction resistance plates 11 on the gas passage between the suction chamber 10 and the suction channel 4. The plurality of suction resistance plates 11 are protruded upward or downward on the gas passage, forming a labyrinth structure of the gas passage and reducing the width of the gas passage. The narrowing of the passage can increase the flow rate of the oil-containing gas when passing through the area of ​​the suction resistance plates 11, avoid accumulation, and form a uniform oil absorption mist effect.

[0038] At the lower end of the oil tank cover 2, a thin-sheet turbulence front baffle 12 is provided. After installation, the lower end of the turbulence front baffle 12 usually extends into the oil in the oil tank, or its lower end is slightly higher than the liquid level of the oil. A plurality of through holes 13 are provided on the thin-sheet turbulence front baffle 12 to facilitate the passage of oil-containing gas; the turbulence front baffle 12 can prevent the oil in the oil tank from being violently stirred due to the instability of the rotating shaft during operation, causing the oil to directly reach the lower sealing position, thereby allowing the oil to flow stably and reducing the generation of oil mist.

[0039] The front end of the air replenishment hole 9 and the front end of the air suction chamber 10, that is, the end facing the surface of the rotating shaft 1, are set to a downwardly inclined structure, which can effectively reduce the resistance of replenishment and air suction when the rotating shaft 1 rotates, and the gas flows more smoothly, resulting in a better sealing effect. The sealing part of the oil tank cover 2 facing the surface of the rotating shaft 1 is provided with sealing teeth 14, and a sealing surface is formed between the sealing teeth 14 and the surface of the rotating shaft 1; the sealing teeth 14 of the utility model are serrated, and the serrated structure is tilted downward. The downwardly inclined (downward in the height direction of the rotating shaft 1) sealing teeth 14 cooperate with the downwardly inclined structure of the front end of the air replenishment hole 9 and the front end of the air suction chamber 10, so that the sealing surface of the oil tank cover 2 of the utility model corresponding to the rotating shaft 1 forms an overall downwardly inclined matching structure, which can effectively reduce the resistance of replenishment and air suction when the rotating shaft 1 rotates, and the gas flows more smoothly, resulting in a better sealing effect.

[0040] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integral oil tank sealing cover structure, comprising an oil tank cover (2) arranged circumferentially around a rotating shaft (1) of a generator, the oil tank cover (2) and corresponding portions of the surface of the rotating shaft (1) forming a sealing surface, a gap being reserved between the two, characterized in that: The oil tank cover (2) is an annular structure; an annular air supply channel (3) and an air intake channel (4) are respectively arranged in the oil tank cover (2); the air supply channel (3) is connected to an air supply device (7); the air intake channel (4) is connected to an oil mist treatment device (8); a plurality of air supply holes (9) are arranged along the circumferential direction on the side of the air supply channel (3) facing the rotating shaft (1); the air supply holes (9) are connected to the gap between the rotating shaft (1) and the oil tank cover (2); the air intake channel (4) is connected to the side of the rotating shaft (1) along the circumferential direction. A plurality of air intake cavities (10) are provided; the air intake cavities (10) are connected to the gap between the rotating shaft (1) and the oil tank cover (2); a turbulence front baffle (12) is provided at the lower end of the oil tank cover (2); a plurality of air intake resistance plates (11) are provided on the gas passage between the air intake cavities (10) and the air intake channel (4); the plurality of air intake resistance plates (11) form a labyrinth structure in the gas passage; the front end of the air supply hole (9) and the air intake cavity (10) facing the rotating shaft (1) is arranged to be a downwardly inclined structure.

2. The integrated oil tank sealing cover structure according to claim 1, characterized in that: The air supply channel (3) and the air intake channel (4) are arranged vertically along the axial direction of the rotating shaft (1) or horizontally along the radial direction of the rotating shaft (1).

3. The integrated oil tank sealing cover structure according to claim 1, characterized in that: The turbulence front baffle (12) is provided with a plurality of through holes (13).

4. The integrated oil tank sealing cover structure according to claim 1, characterized in that: The surface of the oil tank cover (2) facing the rotating shaft (1) is provided with sealing teeth (14); the sealing teeth (14) are sawtooth-shaped and cooperate with the front ends of the air supply holes (9) and the air suction chamber (10) to be tilted downward.

5. The integrated oil tank sealing cover structure according to claim 1, characterized in that: The air replenishing holes (9) correspond one to one with the air suction cavities (10).

Images