Combined sealing structure of a tidal energy generator set

Abstract

The present invention discloses a combined sealing structure of a tidal energy generator set, including a shaft sleeve and a pump-out type dynamic pressure seal dynamic ring fixed on the shaft sleeve, a static ring mounting seat and a pump-out type dynamic pressure seal static ring fixed on the static ring mounting seat, a compensation device, an auxiliary sealing ring and a lip sealing ring; the combination of the pump-out type dynamic pressure seal and the lip sealing ring of the present invention can realize the normal operation of the tidal energy generator set under a relatively deep water condition, the pump-out type dynamic pressure seal operates non-contact, and the lip sealing ring is almost not subjected to pressure, which greatly improves the service life of the sealing device; the pump-out type dynamic pressure seal has a special pumping effect, which can discharge the leaked liquid out of the equipment, achieve zero leakage, and effectively extend the service life of the lubricating oil in the bearing cavity. The combined seal of the present invention effectively solves the problems of poor sealing performance and short service life of the traditional sealing device of the tidal energy generator set.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, and in particular to a combined sealing structure of a tidal energy generator set. Background Art

[0002] As the first gateway between the tidal energy generator set and the outside world, the sealing device prevents the leakage of lubricating oil and the entry of external pollutants and impurities into the transmission system, and plays a very critical role in the normal operation of the entire equipment.

[0003] Once the seal fails, it will cause excessive loss of lubricating oil and lead to poor bearing lubrication; external pollutants entering the bearing cavity will pollute the oil circuit, and water mist entering the bearing cavity will cause cavitation and corrosion of the bearing. These problems will cause the bearing cavity and even the transmission system to fail to work properly.

[0004] The many forms of sealing currently used in tidal energy generator sets, such as contact end face seals, rubber lip seals, etc., have tended to reach the limit of their working capabilities, and often have disadvantages such as large leakage, severe wear, high friction heat generation and poor reliability. They are gradually unable to meet the needs of work and cannot ensure both long life and reliability while ensuring sealing performance. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a combined sealing structure for a tidal energy generator set, which solves the above-mentioned problems by combining a pump-out type dynamic pressure seal and a lip seal.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: a combined sealing structure of a tidal energy generator set, including a sealing mounting seat, a bearing cavity located in the sealing mounting seat, and a sleeve arranged in front of the bearing cavity and rotating with the shaft, the sealing mounting seat is composed of an inner mounting seat and an outer mounting seat, a static ring mounting seat is sleeved on the sleeve, a compensation device is arranged between the static ring mounting seat and the outer mounting seat, a lip sealing ring is installed between the inner mounting seat and the sleeve, the lip sealing ring and the outer mounting seat remain relatively stationary, the channel between the inner mounting seat and the sleeve on the left side of the lip sealing ring is connected to the bearing cavity, so that the lip sealing ring contacts and rotates relatively with the sleeve to prevent leakage of lubricating oil in the bearing cavity and infiltration of external impurities into the bearing cavity, and an auxiliary sealing ring is installed in the channel between the outer mounting seat and the static ring mounting seat, thereby assisting the sealing ring The channel between the right side stationary ring mounting seat and the outer mounting seat is connected with the channel between the inner mounting seat and the shaft sleeve on the left side of the lip seal ring, and the isolation chamber between the inner mounting seat and the outer mounting seat to form a sealed chamber. The seawater that may leak in and the lubricating oil at the leakage point are temporarily stored in the sealed chamber, and the leaked liquid can be discharged by regularly flushing or sucking the sealed chamber; a pump-out type dynamic pressure sealing dynamic ring and a pump-out type dynamic pressure sealing static ring are arranged in sequence between the front end convex edge of the shaft sleeve and the stationary ring mounting seat, and an open area communicating with the external seawater is formed between the front end convex edge of the shaft sleeve, the outer edge surface of the pump-out type dynamic pressure sealing dynamic ring and the outer mounting seat. The pump-out type dynamic pressure sealing dynamic ring and the pump-out type dynamic pressure sealing static ring arranged along the axis form a pair of sealing end faces perpendicular to the rotation axis. Under the action of fluid pressure and the compensation device and with the cooperation of the auxiliary sealing ring, the pair of sealing end faces remain in contact and slide relatively to prevent fluid leakage.

[0007] A combined sealing structure of a tidal energy generator set, wherein the pump-out type dynamic pressure seal dynamic ring is provided with a plurality of micron-level flow channels curved toward the center of a circle on the end face, the flow channels are evenly distributed on a circle to form a circle of spiral grooves in the circumferential direction, the flow channels converge inward along the opening at the outer end to the root tip G, and when the pump-out type dynamic pressure seal dynamic ring rotates, the spiral groove draws the fluid in the inner area into the flow channel, and when the fluid moves to the root tip G of the spiral groove, part of the fluid converges there to form local high pressure, thereby realizing the sealing of the pump-out type dynamic pressure seal dynamic ring and the pump-out type dynamic pressure seal static ring.

[0008] In the combined sealing structure of the tidal energy generator set, the compensation device is a spring.

[0009] In the combined sealing structure of a tidal energy generator set, a pump-out type dynamic pressure seal dynamic ring and a pump-out type dynamic pressure seal static ring are fixed on a shaft sleeve and a static ring mounting seat respectively.

[0010] The beneficial effects of the present invention are as follows: the combination of the pump-out type dynamic pressure seal and the lip seal of the present invention can realize the normal operation of the tidal energy generator set under the condition of greater water depth. The pump-out type dynamic pressure seal operates non-contact, and the lip seal ring is almost not under pressure, which greatly improves the life of the sealing device; the pump-out type dynamic pressure seal has a special pumping effect, which can discharge the leaked liquid out of the equipment, achieve zero leakage, and effectively extend the service life of the bearing cavity lubricating oil. The combined seal of the present invention effectively solves the problems of poor sealing performance and short life of the traditional sealing device of the tidal energy generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 This is a working principle diagram of the pump-out type dynamic pressure seal of the present invention;

[0013] Figure 3 yes Figure 2 A partial enlarged view of part A;

[0014] Figure 4 It is a schematic diagram of the end face structure of the dynamic ring of the pump-out type dynamic pressure seal of the present invention.

[0015] The figures are marked as follows: 1—dynamic ring of pump-out type dynamic pressure seal, 2—static ring of pump-out type dynamic pressure seal, 3—static ring mounting seat, 4—compensation device, 5—auxiliary sealing ring, 6—shaft sleeve, 7—lip sealing ring, 8—isolation chamber, 9—bearing chamber, 101—inner mounting seat, 102—outer mounting seat, 11—flow channel, 12—weir area, 13—dam area. DETAILED DESCRIPTION

[0016] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the various components in the accompanying drawings are drawn in specific proportions, these proportional relationships are only exemplary, and those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0017] It should be noted that, in the description of the present invention, terms such as "center", "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0018] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a connection between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Reference Figure 1 As shown, the present invention discloses a combined sealing structure of a tidal energy generator set, including a sealing mounting seat, a bearing cavity 9 located in the sealing mounting seat, and a sleeve 6 arranged in front of the bearing cavity 9 and rotating with the shaft, wherein the sealing mounting seat is composed of an inner mounting seat 101 and an outer mounting seat 102, a stationary ring mounting seat 3 is sleeved on the sleeve 6, a compensation device 4 is arranged between the stationary ring mounting seat 3 and the outer mounting seat 102, and the compensation device 4 can be a spring, a lip seal ring 7 is installed between the inner mounting seat 101 and the sleeve 6, the lip seal ring 7 and the outer mounting seat 101 remain relatively stationary, the channel between the inner mounting seat 101 and the sleeve 6 on the left side of the lip seal ring 7 is connected with the bearing cavity 9, so that the lip seal ring 7 contacts with the sleeve 6 and rotates relatively, so as to prevent the leakage of the lubricating oil of the bearing cavity 9 and the infiltration of external impurities into the bearing cavity 9, and the channel between the outer mounting seat 102 and the stationary ring mounting seat 3 is installed with an auxiliary seal ring 5, so that the stationary ring mounting seat 3 and the outer mounting seat 102 on the right side of the auxiliary seal ring 5 are connected. The channel is connected with the channel between the inner mounting seat 101 on the left side of the lip seal ring 7 and the shaft sleeve 6, and the isolation chamber 8 between the inner mounting seat 101 and the outer mounting seat 102 to form a sealed chamber. The seawater that may leak in and the lubricating oil at the leakage point are temporarily stored in the sealed chamber, and the leaked liquid can be discharged by regularly flushing or sucking the sealed chamber; a pump-out type dynamic pressure seal dynamic ring 1 and a pump-out type dynamic pressure seal static ring 2 are arranged in sequence between the front end convex edge of the shaft sleeve 6 and the static ring mounting seat 3, and the pump-out type dynamic pressure seal dynamic ring 1 and the pump-out type The dynamic pressure seal static ring 2 is fixed on the shaft sleeve 6 and the static ring mounting seat 3 respectively. An open area communicating with the external seawater is formed between the front end convex edge of the shaft sleeve 6, the outer edge surface of the pump-out type dynamic pressure seal dynamic ring 1 and the outer mounting seat 102. The pump-out type dynamic pressure seal dynamic ring 1 and the pump-out type dynamic pressure seal static ring 2 arranged along the axis form a pair of sealing end faces perpendicular to the rotation axis. Under the action of fluid pressure and compensation device 4 and the cooperation of auxiliary sealing ring 5, the pair of sealing end faces remain in contact and slide relatively to prevent fluid leakage.

[0020] Since the lip seal 7 and the casing remain relatively stationary and the sleeve 6 rotates with the shaft, the lip seal 7 contacts and rotates relatively with the sleeve 6 to prevent the leakage of lubricating oil in the bearing cavity 9 and the penetration of foreign impurities into the bearing cavity 9.

[0021] Reference Figure 2 and Figure 3 As shown, the pump-out type dynamic pressure seal dynamic ring 1 is provided with a plurality of micron-level flow channels 11 curved toward the center of the circle on the end surface, and the plurality of flow channels 11 are evenly distributed on a circumference to form a circle of spiral grooves in the circumferential direction, such as Figure 4 As shown, the spiral line is usually a logarithmic spiral line. The angle between the projection distance of the spiral line on a certain rotation axis and a defined period of the axis is called the spiral angle. α , θ is the helix angle, r is the helix radius, r i is the inner radius of the spiral groove / inner radius of the end face of the moving ring, r g is the groove top radius, r o is the outer radius of the end face of the moving ring, h g The spiral groove depth is usually 2.5 to 10 μm. h 0 is the thickness of the fluid film between the sealing end faces at the micron level, a weir area 12 is formed between two adjacent flow channels 11, and the outer side of the end face is a dam area 13. The flow channel 11 converges inward along the opening of the outer end to the root tip G. When the pump-out type dynamic pressure seal dynamic ring 1 rotates, the spiral groove sucks the fluid in the inner area into the flow channel 11. When the fluid moves to the root tip G of the spiral groove 11, part of the fluid converges there to form a local high pressure, thereby realizing the sealing of the pump-out type dynamic pressure seal dynamic ring 1 and the pump-out type dynamic pressure seal static ring 2.

[0022] Under the combined influence of periodic local high pressure, external fluid pressure and the action of the compensation device 4 on the sealing end faces of the pump-out type dynamic pressure seal dynamic ring 1 and the pump-out type dynamic pressure seal static ring 2 of the present invention, a micrometer-level fluid film is formed between the sealing end faces, thereby realizing non-contact operation; when the pump-out type dynamic pressure seal dynamic ring 1 is in operation, the spiral groove 11 sucks the fluid in the inner area into the groove, forming a pumping effect, and can pump the seawater that may leak into the equipment out of the outside, thereby realizing zero leakage.

[0023] An example of the present invention is described in detail above, and the protection scope of the present invention should not be considered to be limited to the specific form described in the embodiment. All equivalent changes and improvements made based on the concept of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A combined sealing structure of a tidal energy generator set, characterized in that: The invention comprises a sealing mounting seat, a bearing cavity (9) located in the sealing mounting seat, and a shaft sleeve (6) arranged in front of the bearing cavity (9) and rotating with the shaft, wherein the sealing mounting seat is composed of an inner mounting seat (101) and an outer mounting seat (102), a stationary ring mounting seat (3) is sleeved on the shaft sleeve (6), a compensation device (4) is arranged between the stationary ring mounting seat (3) and the outer mounting seat (102), a lip seal (7) is arranged between the inner mounting seat (101) and the shaft sleeve (6), the lip seal (7) and the outer mounting seat (102) remain relatively stationary, and an auxiliary seal (5) is arranged in the channel between the outer mounting seat (102) and the stationary ring mounting seat (3), so that the auxiliary seal (5) ) A passage between the right side stationary ring mounting seat (3) and the outer mounting seat (102) is connected to a passage between the left side inner mounting seat (101) and the shaft sleeve (6) of the lip seal ring (7), and an isolation chamber (8) between the inner mounting seat (101) and the outer mounting seat (102) to form a sealing chamber; a pump-out type dynamic pressure sealing moving ring (1) and a pump-out type dynamic pressure sealing stationary ring (2) are sequentially arranged between the front end convex edge of the shaft sleeve (6) and the stationary ring mounting seat (3); an open area communicating with seawater is formed between the front end convex edge of the shaft sleeve (6), the pump-out type dynamic pressure sealing moving ring (1) and the outer mounting seat (102); and the pump-out type dynamic pressure sealing moving ring (1) and the pump-out type dynamic pressure sealing stationary ring (2) form a pair of sealing end faces perpendicular to the axis.

2. A combined sealing structure of a tidal energy generator set according to claim 1, characterized in that: The pump-out type dynamic pressure seal dynamic ring (1) is provided with a plurality of micrometer-level flow channels (11) curved toward the center of a circle on the end surface. The flow channels (11) are evenly distributed on a circumference to form spiral grooves. The flow channels (11) converge inwardly along the opening at the outer end to the root tip. When the pump-out type dynamic pressure seal dynamic ring (1) rotates, the spiral groove draws the fluid inside into the flow channel (11). When the fluid moves to the root tip of the spiral groove, part of the fluid converges to form a local high pressure, thereby achieving sealing of the pump-out type dynamic pressure seal dynamic ring (1) and the pump-out type dynamic pressure seal static ring (2).

3. A combined sealing structure of a tidal energy generator set according to claim 1 or 2, characterized in that: The compensation device (4) is a spring.

4. A combined sealing structure of a tidal energy generator set according to claim 1 or 2, characterized in that: The pump-out type dynamic pressure seal dynamic ring (1) and the pump-out type dynamic pressure seal static ring (2) are fixed on the shaft sleeve (6) and the static ring mounting seat (3) respectively.

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