Bidirectional end face sealing device suitable for multiple extreme working conditions

Abstract

The invention discloses a bidirectional end face sealing device suitable for multiple extreme working conditions. The bidirectional end face sealing device comprises a machine shell, a rotating shaft, a movable sealing ring and a static sealing ring, and a via hole and a mounting cavity surrounding the periphery of the via hole are formed in the machine shell; the rotating shaft penetrates through the via hole and rotates relative to the shell; the movable sealing ring is arranged on the rotating shaft and is suitable for rotating along with the rotating shaft; a first sealing surface is formed on the movable sealing ring; the static sealing ring is arranged on the machine shell, a second sealing face is formed on the static sealing ring, and a sealing gap suitable for medium circulation and communicated with the installation cavity is formed between the first sealing face and the second sealing face. Wherein a first flow containing cavity and a second flow containing cavity which are sequentially formed in the medium flowing direction are formed between the first sealing face and the second sealing face, and the depth of the first flow containing cavity is larger than that of the second flow containing cavity. The method has high adaptability and stability.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical seals, and in particular to a bidirectional end face seal device suitable for multiple extreme working conditions. Background Art

[0002] The mechanical seal end face structure is a basic key component in various rotary fluid machinery. A mechanical seal is a device that keeps the sealing ring in close contact and relatively sliding under the combined action of the end face fluid pressure perpendicular to the axis of rotation, the compensation element, and the auxiliary seal, thereby reducing fluid leakage. In the related art, common mechanical end face seals have relatively mature sealing end faces and structural designs for sealing gaseous and liquid media. However, with the development of sealing technology and the extension of sealing application media, for working conditions with a larger parameter range (such as speed, pressure, and temperature) or working conditions that change frequently, the general sealing mechanism is not enough to ensure the applicability and operation of the same set of sealing structures in a variety of working conditions, especially in extreme working conditions. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a bidirectional end face sealing device suitable for multiple extreme working conditions, which can be suitable for working conditions with a large range of parameters such as different pressures, different temperatures, and different speeds, as well as working conditions where parameters often change, and can improve the adaptability of the seal and ensure the effectiveness of the seal.

[0004] The embodiment of the present invention provides a bidirectional end face sealing device suitable for multiple extreme working conditions, and the bidirectional end face sealing device comprises: a housing, a rotating shaft, a dynamic sealing ring and a static sealing ring, wherein a through hole and a mounting cavity surrounding the outer circumference of the through hole are formed on the housing; the rotating shaft passes through the through hole and rotates relative to the housing; the dynamic sealing ring is arranged on the rotating shaft and is suitable for rotating with the rotating shaft, and the dynamic sealing ring forms a first sealing surface; the static sealing ring is arranged on the housing, and the static sealing ring forms a second sealing surface, and a sealing gap suitable for flowing medium and connected to the mounting cavity is formed between the first sealing surface and the second sealing surface; wherein a first flow-containing cavity and a second flow-containing cavity are sequentially arranged in the flow direction of the medium, and the depth of the first flow-containing cavity is greater than the depth of the second flow-containing cavity; the first flow-containing cavity and / or the second flow-containing cavity are configured as a plurality of circumferentially spaced cavities; and a portion of the plurality of first flow-containing cavities and / or the second flow-containing cavities is inclined clockwise in a direction away from the center of the circle, and a portion of the plurality of first flow-containing cavities and / or the second flow-containing cavities is inclined counterclockwise in a direction away from the center of the circle.

[0005] According to the bidirectional end face sealing device of the embodiment of the present invention, when the rotating shaft works under lower pressure conditions, due to the setting of the second volumetric flow chamber, the bidirectional end face sealing device can easily obtain the bearing capacity of the seal and has considerable stability; when the rotating shaft works under higher pressure conditions, due to the setting of the first volumetric flow chamber, the local deformation under high pressure helps to cause local deformation, induces the formation of local waviness and taper, and further provides effective bearing capacity and stability through dynamic pressure effect and static pressure effect. At a lower speed, due to the effect of the second volumetric flow chamber, it can be equivalent to reducing the balance ratio and forming a certain positive taper, which helps to provide additional bearing capacity; at a higher speed, the second volumetric flow chamber plays a major role, providing the main bearing capacity through the dynamic pressure effect. The bidirectional end face sealing device of the embodiment of the present invention can be applied to both higher pressure and lower pressure conditions, and to both higher and lower speeds, and can also be applied to fluid media of different temperatures and different phases; it has high adaptability and stability. At the same time, the bidirectional end face sealing device of the present application can adapt to fluid media of different flow directions and can be applied to working conditions of different steering. The bidirectional end face sealing device of the present application is suitable for multiple extreme working conditions.

[0006] According to some embodiments of the present invention, a first sealing groove is formed on at least one of the first sealing end face and the second sealing end face, and a second sealing groove is formed on at least one of the first sealing end face and the second sealing end face; wherein a first flow-containing cavity is defined in the first sealing groove, and a second flow-containing cavity is defined in the second sealing groove.

[0007] According to some embodiments of the present invention, two adjacent first sealing grooves are inclined in opposite directions in a direction away from the center of the circle, and / or two adjacent second sealing grooves are inclined in opposite directions in a direction away from the center of the circle.

[0008] According to a further embodiment of the present invention, adjacent first sealing grooves are communicated with each other at radial inner ends.

[0009] According to some embodiments of the present invention, the plurality of first sealing grooves have the same inclination direction in the direction away from the center of the circle and / or the plurality of second sealing grooves have the same inclination direction in the direction away from the center of the circle.

[0010] According to some embodiments of the present invention, the first sealing groove and the second sealing groove are configured as straight line grooves, folded line grooves or curved line grooves.

[0011] According to some embodiments of the present invention, the sidewall of the first sealing groove is configured as a plane, multi-segment surface or curved surface extending in the axial direction and / or the sidewall of the second sealing groove is configured as a plane, multi-segment surface or curved surface extending in the axial direction.

[0012] According to some embodiments of the present invention, the bottom wall of the first sealing groove is configured as a plane, a multi-segment surface or a curved surface and / or the bottom wall of the second sealing groove is configured as a plane, a multi-segment surface or a curved surface.

[0013] According to some embodiments of the present invention, a communication channel connecting the first sealing groove and the second sealing groove is formed between the first sealing surface and the second sealing surface.

[0014] According to some embodiments of the present invention, the depth of the first flow cavity is L1, the depth of the second flow cavity is L2, and the following conditions are satisfied: 0.1 mm ≤ L1 ≤ 2.0 mm, 0.5 μm ≤ L2 ≤ 200 μm.

[0015] According to some embodiments of the present invention, the bidirectional end face sealing device further includes: an elastic member, one end of the elastic member is connected to the inner wall of the housing, and the other end of the elastic member is connected to the static sealing ring.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic structural diagram of a bidirectional end face sealing device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a bidirectional end face sealing device according to an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a bidirectional end face sealing device according to an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a bidirectional end face sealing device according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the sealing end face structure of a bidirectional end face sealing device according to an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the sealing end face structure of a bidirectional end face sealing device according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Rotating shaft 1; housing 2; static sealing ring 3; dynamic sealing ring 4; first flow-carrying cavity 5; second flow-carrying cavity 6; elastic member 7; first sealing groove 8; second sealing groove 9. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] Reference below Figure 1-Figure 6 A bidirectional end face sealing device suitable for multiple extreme working conditions according to an embodiment of the present invention is described. The bidirectional end face sealing device can be used as a key component in major equipment in the fields of nuclear power, aerospace, petrochemicals, etc., and can also be widely used in rotating machinery such as compressors, expanders, pumps, reactor agitators, etc.

[0028] The embodiment of the present invention provides a bidirectional end face sealing device suitable for multiple extreme working conditions, the bidirectional end face sealing device comprising: a housing 2, a rotating shaft 1, a dynamic sealing ring 4 and a static sealing ring 3, the housing 2 is formed with a through hole and a mounting cavity surrounding the outer periphery of the through hole; the rotating shaft 1 passes through the through hole and rotates relative to the housing 2; the dynamic sealing ring 4 is arranged on the rotating shaft 1 and is suitable for rotating with the rotating shaft 1, and the dynamic sealing ring 4 is formed with a first sealing surface; the static sealing ring 3 is arranged on the housing 2, and the static sealing ring 3 is formed with a second sealing surface, and a suitable for circulation is formed between the first sealing surface and the second sealing surface A sealing gap is formed between the first sealing surface and the second sealing surface, wherein a first flow-containing cavity 5 and a second flow-containing cavity 6 are sequentially arranged in the flow direction of the medium, and the depth of the first flow-containing cavity 5 is greater than the depth of the second flow-containing cavity 6; the first flow-containing cavity 5 and / or the second flow-containing cavity 6 are configured as a plurality of circumferentially spaced cavities; and parts of the plurality of first flow-containing cavities 5 and / or the second flow-containing cavity 6 are inclined clockwise in the direction away from the center of the circle, and parts of the plurality of first flow-containing cavities 5 and / or the second flow-containing cavity 6 are inclined counterclockwise in the direction away from the center of the circle.

[0029] It should be noted that when the bidirectional end face sealing device is working, the dynamic sealing ring 4 and the static sealing ring 3 move relative to each other, and the pressure of the sealing medium and the axial force between the structures make the dynamic sealing ring 4 and the static sealing ring 3 fit each other, that is, the first sealing surface of the dynamic sealing ring 4 and the second sealing surface of the static sealing ring 3 fit tightly and form a small sealing gap. When the pressure medium passes through this sealing gap, an extremely thin liquid film will be formed, generating resistance to prevent the leakage of the medium; at the same time, the liquid film has fluid dynamic pressure and static pressure, which plays a role in lubrication and pressure balance, so that the sealing end face can be lubricated to achieve a long-term sealing effect. For the medium flowing in the sealing gap, there will be a pressure drop along the flow direction. The flow-containing cavity is set to accommodate part of the sealing medium, so that the pressure of the fluid medium is stabilized in a wider range, and the pressure drop can be slowed down or stopped, which is equivalent to increasing the bearing capacity of the seal and reducing the end face pressure ratio of the sealing end face. The end face pressure ratio of the sealing end face refers to the ratio of the fixed contact force to the sealing bearing capacity.

[0030] According to the bidirectional end face sealing device of the embodiment of the present invention, a first volumetric chamber 5 and a second volumetric chamber 6 are formed between the first sealing surface and the second sealing surface in sequence in the medium flow direction, the depth of the first volumetric chamber 5 is greater than the depth of the second volumetric chamber 6, the depth of the second volumetric chamber 6 is in the micrometer order, and the depth of the first volumetric chamber 5 is in the millimeter order. The radial outer end of the dynamic seal ring 4 and the static seal ring 3 is the upstream high pressure side, and the outer diameter inner end is the downstream low pressure side. The first volumetric chamber 5 is arranged on the upstream high pressure side, and the second volumetric chamber 6 is arranged on the downstream low pressure side. When the fluid medium flows into the sealing gap along the radial direction G, the pressure in the sealing gap also decreases along the radial direction. When the fluid medium flows into the first volumetric chamber 5 and the second volumetric chamber 6 in sequence, the first volumetric chamber 5 or the second volumetric chamber 6 makes the pressure of the fluid medium reach stability within a certain width, so that the pressure reduction can be limited, so that the actual end face specific pressure of the seal is reduced, thereby improving the bearing capacity of the seal, and can also make the seal have better performance in the low-speed operation and start-stop stages, reducing unnecessary wear to protect the end face.

[0031] The depth of the first flow chamber 5 is greater than the depth of the second flow chamber 6. The depth of the second flow chamber 6 is in the micrometer range, and the depth of the first flow chamber 5 is in the millimeter range. After the fluid medium flows into the sealing gap, it flows through the first flow chamber 5 and the second flow chamber 6 in sequence. The first flow chamber 5 and the second flow chamber 6 can play a role in forming a liquid film using the dynamic pressure effect to provide sealing and additional bearing capacity. The cooperation of the two sealing chambers further enhances the dynamic pressure effect. Furthermore, the first flow chamber 5 can cope with higher pressure and high pressure media. The fluid medium will undergo local pressure deformation and thermal deformation under high pressure and high temperature conditions in the first flow chamber 5, inducing the formation of local circumferential waviness and radial taper. Under the traction of the dynamic seal ring 4, the viscous flow along the circumference alternately experiences the convergence zone and the divergence zone. In the convergence zone, the liquid film generates a very high fluid dynamic pressure, so the circumferential waviness can utilize the dynamic pressure effect to generate additional opening force; at the same time, the radial taper can utilize the fluid static pressure effect to generate additional fluid static pressure bearing capacity, so that the opening force is increased; therefore, the first volumetric flow chamber 5 can cope with high pressure to significantly improve the liquid film bearing capacity between the sealing end faces, reduce the end face friction coefficient, and effectively improve the bearing capacity of the seal. At the same time, the first volumetric flow chamber 5 is guided by high pressure so that the area where the vaporization phase change may occur is limited to a limited and controllable area ratio in the sealing gap, which can improve the working performance of the mechanical seal under phase change conditions. In addition, when the speed is relatively low, the role of the first volumetric flow chamber 5 can be equivalent to reducing the balance ratio, that is, reducing the ratio of the closing force applied to the sealing end face to the reverse opening force, which helps to provide additional bearing capacity. Therefore, the first volumetric flow chamber 5 can especially cope with harsh working conditions such as high temperature, high pressure and high speed.

[0032] In addition, the present application arranges multiple first flow chambers 5 and second flow chambers 6 circumferentially to make the flow of the fluid medium in the sealing gap more uniform in the circumferential direction; at the same time, parts of the multiple first flow chambers 5 and / or the second flow chambers 6 are inclined clockwise in the direction away from the center of the circle, and parts of the multiple first flow chambers 5 and / or the second flow chambers 6 are inclined counterclockwise in the direction away from the center of the circle. Due to the effects of shear force and rotational force, the rotating fluid will be more easily introduced into the first flow chamber 5 and the second flow chamber 6 corresponding to its flow direction; more importantly, the bidirectional end face sealing device of the present application has inclined flow chambers in both clockwise and counterclockwise directions, which can adapt to fluid media with different flow directions, thereby making the bidirectional end face sealing device suitable for clockwise and counterclockwise steering conditions.

[0033] According to the bidirectional end face sealing device of the embodiment of the present invention, when the rotating shaft 1 works under a lower pressure condition, due to the setting of the second volumetric flow chamber 6, the bidirectional end face sealing device can use the dynamic pressure effect to easily obtain the bearing capacity of the seal and has considerable stability; when the rotating shaft 1 works under a higher pressure condition, due to the setting of the first volumetric flow chamber 5, the local deformation under high pressure helps to cause local deformation, induces the formation of local waviness and taper, and further provides effective bearing capacity and stability through the dynamic pressure effect and static pressure effect. At a lower speed, due to the effect of the second volumetric flow chamber 6, it can be equivalent to reducing the balance ratio and forming a certain positive taper, which helps to provide additional bearing capacity; at a higher speed, the second volumetric flow chamber 6 plays a major role and provides the main bearing capacity through the dynamic pressure effect. The bidirectional end face sealing device of the present application can be applied to both higher pressure and lower pressure conditions, and to both higher and lower speeds, and can also be applied to fluid media of different temperatures and different phases; it has high adaptability and stability. At the same time, the bidirectional end face sealing device of the present application can adapt to fluid media of different flow directions and can be applied to working conditions of different steering. In summary, the bidirectional end face sealing device of the present application is suitable for multiple extreme working conditions.

[0034] According to some embodiments of the present invention, a first sealing groove 8 is formed on at least one of the first sealing end surface and the second sealing end surface, and a second sealing groove 9 is formed on at least one of the first sealing end surface and the second sealing end surface; wherein the first sealing groove 8 defines a first flow-carrying cavity 5, and the second sealing groove 9 defines a second flow-carrying cavity 6. In this embodiment, the sealing cavity is formed in the form of a groove, and the structure is relatively simple and easy to process and assemble.

[0035] According to some embodiments of the present invention, two adjacent first sealing grooves 8 are inclined in opposite directions in the direction away from the center of the circle, and / or two adjacent second sealing grooves 9 are inclined in opposite directions in the direction away from the center of the circle. In this embodiment, the two adjacent first sealing grooves 8 are inclined in opposite directions, and the two adjacent second sealing grooves 9 are inclined in opposite directions, so that the bidirectional end face sealing device has first sealing grooves 8 and second sealing grooves 9 inclined in both clockwise and counterclockwise directions, that is, it has flow grooves in both clockwise and counterclockwise directions, so that the bidirectional end face sealing device of the present application has relatively similar adaptability to fluid media with different flow directions, so that it can adapt to fluid media with different flow directions, and further improve the adaptability of the bidirectional end face sealing device to different steering conditions, so that it can flexibly adapt to steering conditions, such as Figure 5 , 6 As shown, it can adapt to two rotation directions, A and B.

[0036] According to a further embodiment of the present invention, adjacent first sealing grooves 8 are connected to each other at the radial inner ends. Adjacent first sealing grooves 8 of this embodiment are connected to each other at the radial inner ends, that is, two adjacent first sealing grooves 8 with opposite inclination directions are interconnected at the radial inner ends, so that one of the two connected first sealing grooves 8 is formed as a headflow groove, and the other is formed as a return flow groove. After the fluid medium flows into the headflow groove, part of it flows into the return flow groove due to the shear force. The return flow groove can return part of the fluid medium to the upstream, effectively reducing the leakage of the sealing medium to the low pressure or atmosphere side. Figure 5 , Figure 6 As shown, in some embodiments, the first sealing groove 8 is configured as a broken line shape opening toward the upstream side.

[0037] According to some embodiments of the present invention, the multiple first sealing grooves 8 have the same inclination direction in the direction away from the center of the circle and / or the multiple second sealing grooves 9 have the same inclination direction in the direction away from the center of the circle. When the multiple first sealing grooves 8 and the multiple second sealing grooves 9 have the same inclination direction, the dynamic pressure effect can be improved, and the bearing capacity and stability of the seal can be improved. Figure 5 As shown, the inclination directions of the plurality of second sealing grooves 9 are the same.

[0038] According to some embodiments of the present invention, the first sealing groove 8 and the second sealing groove 9 are configured as straight grooves, broken line grooves or curved grooves. The side wall of the first sealing groove 8 is configured as a plane, multi-segment surface or curved surface extending in the axial direction and / or the side wall of the second sealing groove 9 is configured as a plane, multi-segment surface or curved surface extending in the axial direction. The bottom wall of the first sealing groove 8 is configured as a plane, multi-segment surface or curved surface and / or the bottom wall of the second sealing groove 9 is configured as a plane, multi-segment surface or curved surface.

[0039] In this embodiment, the shapes of the first sealing groove 8 and the second sealing groove 9 can be various, and grooves of different shapes have different dynamic pressure effects, different opening forces, leakage amounts, and liquid film stiffness. The shapes of the first sealing groove 8 are different, and the difference between its circumferential waviness and radial taper is large, and the strength of the dynamic pressure effect is also different. At the same time, different groove types also have different diversion effects, and can use shear force and rotational force to change the flow direction of the medium. In practice, it can be selected and designed according to the needs in combination with the difficulty of processing. Further, the first sealing groove 8 and the second sealing groove 9 are not limited to the axial cylindrical structure, and the profiles of the notch and the bottom of the groove are not limited to being exactly the same. The first sealing groove 8 and the second sealing groove 9 can be wide at the top and narrow at the bottom, or narrow at the top and wide at the bottom, and the shape is diversified and easy to process. The bottom of the first sealing groove 8 and the second sealing groove 9 can have a certain slope or undulation, that is, the depth of the first sealing groove 8 and the second sealing groove 9 can be variable, so that the amplitude of increasing the opening force is different, the ability to reduce the leakage amount is different, and the accumulation of solid impurity particles in the fluid medium can be affected. In practice, the stability of the seal can be improved according to the needs.

[0040] According to some embodiments of the present invention, a communication channel is formed between the first sealing surface and the second sealing surface to connect the first sealing groove 8 with the second sealing groove 9. The design of connecting the first sealing groove 8 with the second sealing groove 9 makes it easier to introduce the fluid medium from the first sealing groove 8 to the second sealing groove 9. At the same time, the thickness of the liquid film can be increased at the communication channel, and more dynamic pressure effects are utilized to improve the effectiveness and stability of the seal.

[0041] According to some embodiments of the present invention, the depth of the first voluminous cavity 5 is L1, and the depth of the second voluminous cavity 6 is L2, and they satisfy: 0.1mm≤L1≤2.0mm, 0.5μm≤L2≤200μm. In this embodiment, the depths of the first voluminous cavity 5 and the second voluminous cavity 6 are limited to the above range, so that the dynamic pressure effect of the second voluminous cavity 6 can be best, so that the circumferential waviness and radial taper formed in the first voluminous cavity 5 can adapt to a wider range of pressure conditions, temperature conditions, etc., and the sealing of the bidirectional end face sealing device of this embodiment has high stability and effectiveness.

[0042] According to some embodiments of the present invention, the bidirectional end face sealing device further includes: an elastic member 7, one end of the elastic member 7 is connected to the inner wall of the housing 2, and the other end of the elastic member 7 is connected to the static sealing ring 3. In this embodiment, the static sealing ring 3 and the housing 2 are connected by the elastic member 7, which can realize the installation of the static sealing ring 3 on the one hand, and can provide the initial axial force of the seal on the other hand, and at the same time provide a space for a slight change in the sealing gap when there is a pressure difference between the liquid film pressure and the elastic force, reduce the friction between the dynamic sealing ring 4 and the static sealing ring 3 on the sealing end face, avoid the phase change caused by the friction overheating of the fluid medium, and avoid excessive wear of the dynamic sealing ring 4 and the static sealing ring 3, so as to ensure the stability and effectiveness of the seal.

[0043] According to some embodiments of the present invention, the first sealing groove 8 and the second sealing groove 9 can be provided on either the dynamic sealing ring 4 or the static sealing ring 3. In practice, they can be provided on a more wear-resistant sealing ring. Figure 1 As shown, the first sealing groove 8 and the second sealing groove 9 are both provided on the dynamic sealing ring 4. Figure 2 As shown, the first sealing groove 8 and the second sealing groove 9 are both arranged on the static sealing ring 3. Figure 3 As shown, the first sealing groove 8 is provided on the dynamic sealing ring 4, and the second sealing groove 9 is provided on the static sealing ring 3. Figure 4 As shown, the first sealing groove 8 is arranged on the static sealing ring 3 , and the second sealing groove 9 is arranged on the dynamic sealing ring 4 .

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0046] In the description of the present invention, "plurality" means two or more.

[0047] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0048] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A bidirectional end face sealing device suitable for multiple extreme working conditions, characterized in that: include: A housing, wherein the housing is formed with a via hole and a mounting cavity surrounding the periphery of the via hole; A rotating shaft, the rotating shaft passes through the through hole and rotates relative to the housing; A dynamic sealing ring, the dynamic sealing ring is arranged on the rotating shaft and is adapted to rotate with the rotating shaft, and the dynamic sealing ring is formed with a first sealing surface; A static sealing ring, the static sealing ring is arranged on the housing, the static sealing ring forms a second sealing surface, and a sealing gap suitable for circulating medium and communicating with the installation cavity is formed between the first sealing surface and the second sealing surface; wherein A first flow-containing cavity and a second flow-containing cavity are formed between the first sealing surface and the second sealing surface, and are arranged in sequence in the medium flow direction. The depth of the first flow-containing cavity is greater than the depth of the second flow-containing cavity. The first volume flow chamber and / or the second volume flow chamber are configured to be multiple and spaced apart in the circumferential direction; and parts of the multiple first volume flow chambers and / or the second volume flow chambers are inclined in a clockwise direction away from the center of the circle, and parts of the multiple first volume flow chambers and / or the second volume flow chambers are inclined in a counterclockwise direction away from the center of the circle.

2. The bidirectional end face sealing device suitable for multiple extreme working conditions according to claim 1, characterized in that: A first sealing groove is formed on at least one of the first sealing end surface and the second sealing end surface, and a second sealing groove is formed on at least one of the first sealing end surface and the second sealing end surface; wherein The first sealing groove defines the first flow-containing cavity, and the second sealing groove defines the second flow-containing cavity.

3. The bidirectional end face sealing device suitable for multiple extreme working conditions according to claim 2, characterized in that: Two adjacent first sealing grooves are inclined in opposite directions in a direction away from the center of the circle, and / or two adjacent second sealing grooves are inclined in opposite directions in a direction away from the center of the circle.

4. The bidirectional end face sealing device suitable for multiple extreme working conditions according to claim 3 is characterized in that: Adjacent first sealing grooves are communicated with each other at radial inner ends.

5. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 2, characterized in that: The plurality of first sealing grooves have the same inclination direction in the direction away from the center of the circle, and / or the plurality of second sealing grooves have the same inclination direction in the direction away from the center of the circle.

6. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 2, characterized in that: The first sealing groove and the second sealing groove are configured as straight line grooves, folded line grooves or curved line grooves.

7. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 2, characterized in that: The side wall of the first sealing groove is configured as a plane, a multi-segment surface or a curved surface extending in the axial direction and / or the side wall of the second sealing groove is configured as a plane, a multi-segment surface or a curved surface extending in the axial direction.

8. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 2, characterized in that: The bottom wall of the first sealing groove is configured as a plane, a multi-segment surface or a curved surface and / or the bottom wall of the second sealing groove is configured as a plane, a multi-segment surface or a curved surface.

9. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 2, characterized in that: A communication channel for connecting the first sealing groove with the second sealing groove is formed between the first sealing surface and the second sealing surface.

10. The bidirectional end face sealing device suitable for multiple extreme working conditions according to any one of claims 2 to 9, characterized in that: The depth of the first flow-containment cavity is L1, the depth of the second flow-containment cavity is L2, and the following conditions are satisfied: 0.1 mm ≤ L1 ≤ 2.0 mm, 0.5 μm ≤ L2 ≤ 200 μm.

11. The bidirectional end face sealing device applicable to multiple extreme working conditions according to claim 1, characterized in that: Also includes: An elastic member, one end of which is connected to the inner wall of the housing, and the other end of which is connected to the static sealing ring.

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