Dry gas sealing structure of honeycomb-shaped bionic groove

Abstract

The dry gas sealing structure comprises a movable ring and a static ring which are oppositely matched in the axial direction, the sides, away from the axis, of the movable ring and the static ring are high-pressure sides, the sides, close to the axis, of the movable ring and the static ring are low-pressure sides, and movable pressure grooves evenly distributed in the circumferential direction are engraved in the end face of the movable ring. Openings of the dynamic pressure grooves are positioned on the high-pressure side of the end surface of the dynamic ring; fluid enters the sealing gap through the opening position of the dynamic pressure groove, flows through the dynamic pressure groove and then flows out from the low-pressure sides of the dynamic ring and the static ring. According to the dry gas sealing device adopting the honeycomb-shaped bionic groove, in the rotating process, fluid flows into the dynamic pressure groove through the inlet in the high-pressure side of the dynamic pressure groove, a local high-pressure area is formed due to the hindering effect of the bottom of the honeycomb, and therefore the static ring is squeezed open, a sealing film is formed, and the sealing effect is achieved. The fluid can be blocked by the honeycomb boss in the honeycomb-shaped bionic groove, so that the opening force of the gas film is increased, and the problems that in the prior art, the dry gas seal is insufficient in starting capacity, poor in heat dissipation capacity and the like are solved.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of rotary machinery shaft end seals, and specifically relate to a dry gas sealing structure with a honeycomb-shaped bionic groove. Background Art

[0002] In the field of rotating machinery, as the capacity of units increases, the operating parameters gradually increase, and the temperature and pressure requirements of the equipment also increase accordingly, and the shaft end leakage problem of rotating machinery becomes more and more serious. Traditional sealing devices such as labyrinth seals and mechanical seals are no longer suitable for high temperature and high pressure scenes. Dry gas seals have attracted people's attention due to their advantages such as small leakage, strong pressure resistance, low wear, and long service life, and have become a hot spot in the field of rotating machinery shaft end sealing research at this stage.

[0003] During the startup phase of the dry gas seal, the sealing medium enters between the dynamic and static rings through the inlet of the dynamic pressure groove, forming a thin air film. As the dynamic ring begins to rotate with the shaft, the sealing medium is squeezed by the dynamic pressure groove of the dynamic ring, the air film pressure increases, and the thrust on the dynamic and static rings also increases, so that the air film is stable. The air film between the dynamic and static rings of the dry gas seal prevents the dynamic and static rings from contacting each other during operation, reduces the degree of wear on the sealing end face, and extends the service life of the seal. Since the seal is heated by the sealed medium in a high temperature and high pressure environment, the newly added sealing medium is required to cool the dynamic and static rings of the dry gas seal. At the same time, since the capacity of the new unit is large, a lower leakage is required to reduce the loss of circulating working fluid and increase the economic benefits of the unit. The unit rotates forward during normal operation, but may reverse in accident conditions. The use of a two-way dry gas sealing mechanism can effectively reduce the loss of the seal in the reverse condition of the accident condition.

[0004] To this end, it is necessary to develop a shaft end seal for non-contact bidirectional rotation, which can effectively ensure the sealing condition of the sealing medium while cooling the seal and achieve a good sealing effect. It is very necessary to design a dry gas sealing structure with a honeycomb-shaped bionic groove. Summary of the invention

[0005] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a dry gas sealing structure of a honeycomb-shaped bionic groove.

[0006] One aspect of an embodiment of the present disclosure provides a dry gas sealing structure with a honeycomb-shaped bionic groove, comprising a dynamic ring and a static ring that cooperate with each other in the axial direction, the dynamic ring and the static ring being on the high-pressure side away from the axis and on the low-pressure side close to the axis, and dynamic pressure grooves evenly distributed in the circumferential direction are engraved on the end face of the dynamic ring, and the opening position of the dynamic pressure groove is located on the high-pressure side of the end face of the dynamic ring; the fluid enters the sealing gap through the opening position of the dynamic pressure groove, flows through the dynamic pressure groove, and flows out from the low-pressure side of the dynamic ring and the static ring.

[0007] Optionally, the dynamic pressure groove includes a plurality of honeycomb-shaped bionic grooves, the number of which increases successively from the high-pressure side to the low-pressure side, and the number of honeycomb stages is 2 to 6; each level of the honeycomb-shaped bionic groove includes an outer honeycomb flow channel and an inner boss, and the boss is located at the center of the honeycomb flow channel.

[0008] Optionally, the shape of the boss inside the honeycomb flow channel is a regular hexagon, which is the same as the outer contour of the flow channel.

[0009] Optionally, the number of the honeycomb-shaped bionic grooves uniformly distributed along the circumference of the dynamic pressure groove is 8 to 40.

[0010] Optionally, the depth of the honeycomb bionic groove is 1 to 50 μm; the depth of each level of groove is the same, or increases or decreases step by step.

[0011] Optionally, a plurality of micro-textures are arranged on the circumferential position of the honeycomb bionic groove on the sealing end surface, and the micro-textures are circular, elliptical or square.

[0012] Optionally, the depth of the micro texture is 0.5-20 μm.

[0013] Optionally, an annular pressure stabilizing groove is provided at the root of the last-stage honeycomb flow channel of the honeycomb-shaped bionic groove dry gas seal, and the dynamic pressure groove is connected to the annular pressure stabilizing groove.

[0014] Optionally, the groove depth of the annular voltage-stabilizing groove is smaller than the groove depth of the honeycomb-shaped bionic groove, and the inner diameter of the annular voltage-stabilizing groove is larger than the inner diameter of the last stage of the honeycomb-shaped bionic groove.

[0015] Optionally, the groove depth of the annular voltage-stabilizing groove is 2 to 50 μm, and the radial width of the annular voltage-stabilizing groove is 0.5 to 5 mm.

[0016] The beneficial effects of the embodiments of the present disclosure include:

[0017] (1) The dry gas sealing structure of the honeycomb-shaped bionic groove of the present invention is different from the existing dry gas sealing end face. It adopts a honeycomb-shaped bionic groove. During the rotation process, the sealing medium enters the dynamic pressure groove from the high-pressure side, and is blocked by the boss in the groove and squeezed by the bottom of the groove, forming multiple high-pressure areas on the dynamic ring sealing end face, thereby enhancing the sealing aerodynamic performance. At the same time, due to the presence of the boss, the contact area between the sealing medium and the dynamic ring is increased, thereby enhancing the heat exchange capacity between the sealing medium and the dynamic ring, thereby playing a variety of functions.

[0018] (2) The dry gas seal structure of the honeycomb-shaped bionic groove of the present invention can meet the requirements of bidirectional rotation and can effectively prevent damage to the equipment caused by dry gas seal reversal due to unexpected working conditions during actual operation.

[0019] (3) The present invention provides a dry gas seal structure with a honeycomb-shaped bionic groove, and a micro-texture is arranged at the circumferential position of the dynamic pressure groove. The shape and arrangement of the micro-texture can be selected in different forms according to the actual rotation speed. It can also absorb impurities in the sealing medium, reduce the probability of the sealing end face being worn, and help to extend the service life of the seal.

[0020] (4) The present invention provides a dry gas sealing structure with a honeycomb-shaped bionic groove, and an annular pressure-stabilizing groove is provided on the dynamic ring sealing end face to guide the sealing medium inside the dynamic and static rings, thereby making the pressure distribution on the sealing end face more uniform, and at the same time helping to enhance the heat dissipation of the sealing end face and reduce the thermal wear of the sealing end face. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a dry gas sealing structure of a honeycomb-shaped bionic groove according to an embodiment of the present disclosure; wherein the relative positional relationship between the dynamic ring and the static ring is illustrated;

[0022] Figure 2 This is a schematic structural diagram of a dynamic ring according to an embodiment of the present disclosure;

[0023] Figure 3 It is a schematic diagram of a partial structure of a dynamic ring according to an embodiment of the present disclosure;

[0024] Figure 4 It is a structural schematic diagram of a moving ring according to another embodiment of the present disclosure;

[0025] Figure 5 This is a schematic structural diagram of a moving ring according to yet another embodiment of the present disclosure.

[0026] In the figure, 1, dynamic ring; 2, static ring; 3, dynamic pressure groove; 4, honeycomb flow channel; 5, boss; 6, micro texture; 7, annular pressure stabilizing groove. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is only for the convenience of describing the present application 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 present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the error tolerance range. "Parallel" is not parallel in the strict sense, but within the error tolerance range.

[0029] In the description of this application, it should also be noted that, 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] like Figure 1-5 As shown, a dry gas seal structure with a honeycomb-shaped bionic groove includes a dynamic ring 1 and a static ring 2 that are relatively matched along the axial direction. The side of the dynamic ring and the static ring away from the axis is the high-pressure side, and the side close to the axis is the low-pressure side. Dynamic pressure grooves 3 evenly distributed along the circumferential direction are engraved on the end face of the dynamic ring, and the opening position of the dynamic pressure groove is located on the high-pressure side of the end face of the dynamic ring. The fluid enters the sealing gap through the opening position of the dynamic pressure groove, flows through the dynamic pressure groove, and flows out from the low-pressure side of the dynamic ring and the static ring.

[0031] During the rotation of the honeycomb-shaped bionic groove dry gas sealing device adopted by the present invention, the fluid flows into the dynamic pressure groove through the inlet on the high-pressure side of the dynamic pressure groove. Due to the obstruction of the bottom of the honeycomb, a local high-pressure area is formed, thereby squeezing the static ring to form a sealing film to achieve the sealing effect. The fluid inside the honeycomb-shaped bionic groove will be obstructed by the honeycomb boss, so that the opening force of the air film of the present invention is increased to solve the problems of insufficient dry gas seal starting ability and weak heat dissipation ability in the prior art, while reducing the leakage of the working fluid, reducing the wear degree of the seal, and extending the service life of the sealing device.

[0032] In some embodiments, the dynamic pressure groove 3 includes a plurality of honeycomb-shaped bionic grooves, the number of which increases from the high-pressure side to the low-pressure side, and the number of honeycomb levels is 2 to 6. Each level of honeycomb-shaped bionic grooves includes an outer honeycomb flow channel 4 and an inner boss 5, and the boss is located at the center of the honeycomb flow channel.

[0033] In some embodiments, the shape of the boss in the honeycomb flow channel is a regular hexagon, which is the same as the outer contour of the flow channel. On the one hand, the boss hinders the movement of the sealing medium in the dynamic pressure groove. The sealing medium is squeezed at the boss, the pressure increases, and the opening force of the air film is enhanced, thereby enhancing the rigidity of the air film. On the other hand, the contact area between the sealing medium and the end face of the dynamic ring is increased, and the cooling effect of the sealing medium on the dynamic ring is enhanced.

[0034] In some embodiments, the number of honeycomb-shaped bionic grooves uniformly distributed along the circumference of the dynamic pressure groove is 8 to 40. When the number of grooves is too small, the opening force between the dynamic and static rings is small, and wear is easy to occur. When the number of grooves is too large, the structural strength of the sealing ring is affected. An appropriate number of grooves should be set.

[0035] In some embodiments, the depth of the honeycomb bionic groove is 1 to 50 μm, and the depth of each level of groove is the same, or increases or decreases step by step.

[0036] In some embodiments, a plurality of micro-textures 6 are arranged on the circumferential position of the honeycomb bionic groove on the sealing end surface, and the micro-textures are circular, elliptical or square.

[0037] In some embodiments, the depth of the microtexture is 0.5-20 μm.

[0038] In some embodiments, an annular pressure stabilizing groove 7 is provided at the root of the last-stage honeycomb flow channel of the honeycomb-shaped bionic groove dry gas seal, and the dynamic pressure groove is connected to the annular pressure stabilizing groove.

[0039] In some embodiments, the groove depth of the annular voltage-stabilizing groove is smaller than the groove depth of the honeycomb-shaped bionic groove, and the inner diameter of the annular voltage-stabilizing groove is larger than the inner diameter of the last stage of the honeycomb-shaped bionic groove.

[0040] In some embodiments, the depth of the annular voltage-stabilizing groove is 2 to 50 μm, and the radial width of the annular voltage-stabilizing groove is 0.5 to 5 mm.

[0041] The present invention aims to solve the technical problems that under high-temperature and high-pressure inlet conditions, the sealing medium is required to fully cool the sealing part due to the high temperature of the sealing part during operation, and the leakage rate remains unchanged under large flow rates, but the leakage of existing dry gas seals is large and needs to be further reduced. The purpose of the present invention is to provide a dry gas sealing structure with a honeycomb-shaped bionic groove, which increases the contact area between the fluid and the dynamic ring based on the honeycomb-shaped groove, enhances the heat exchange between the sealing medium and the seal, and changes the groove type of the dynamic pressure groove on the sealing end face. The honeycomb-shaped bionic groove is used to further reduce the leakage rate while retaining the advantage of bidirectional rotation.

[0042] Specific examples provided by the present disclosure include:

[0043] Example 1

[0044] As attached Figure 1 to Figure 3 As shown, the present embodiment provides a dry gas sealing structure of a honeycomb-shaped bionic groove, comprising a dynamic ring 1 and a static ring 2 that are relatively matched along the axial direction, the side of the dynamic and static rings away from the axis is the high-pressure air inlet side, and the side close to the axis is the low-pressure outlet side, and the side of the dynamic ring 1 close to the static ring 2 is provided with a dynamic pressure groove 3, and the opening position of the dynamic pressure groove 3 is located on the high-pressure side of the end face of the dynamic ring. The dynamic pressure groove comprises a plurality of honeycomb-shaped bionic grooves, and each level of the honeycomb-shaped bionic groove comprises an outer honeycomb flow channel 4 and an inner boss 5, and the boss is located at the center of the honeycomb flow channel. The shape of the boss is a regular hexagon, which is the same as the outer contour of the flow channel. Figure 3 for

[0045] In the present embodiment 1, the number of honeycomb-shaped bionic grooves is 30, the number of levels of the honeycomb-shaped bionic grooves is 3, and the depth of the bionic grooves is 20 μm. Since the radial dimension is in the millimeter level, the groove depth dimension is too small. For the convenience of observation, the axial dimension is magnified 1000 times in the present embodiment 1. Figure 1 to Figure 3 The dimension shown in the figure is 20 mm in depth. In this embodiment 1, the depth of each level of honeycomb biomimetic groove is the same.

[0046] The shape of the micro texture 6 in the present embodiment 1 is a circular surface. Similarly, the groove depth of the micro texture in the present embodiment 1 is 20 μm. For the convenience of observation, the displayed size is a groove depth of 20 mm.

[0047] In this embodiment 1, an annular voltage stabilizing groove 7 is provided, the inner diameter of the voltage stabilizing groove is 131 mm, the radial width of the voltage stabilizing groove is 2 mm, the groove depth of the voltage stabilizing groove is 10 μm, and for the sake of easy observation, the displayed dimension is 10 mm groove depth.

[0048] Example 2

[0049] As attached Figure 4 As shown, this embodiment provides a dry gas sealing structure of a honeycomb-shaped bionic groove. Compared with embodiment 1, this embodiment 2 only retains the honeycomb-shaped bionic groove and the annular pressure-stabilizing groove 7, and the number of the honeycomb-shaped bionic groove is 20.

[0050] Example 3

[0051] As attached Figure 5 As shown, this embodiment provides a dry gas sealing structure of a honeycomb-shaped bionic groove. Compared with embodiment 1, this embodiment 3 only retains the honeycomb-shaped bionic groove, and the number of honeycomb-shaped bionic grooves is 20, and the number of honeycomb-shaped bionic groove levels is 2.

[0052] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A dry gas sealing structure of a honeycomb-shaped bionic groove, characterized in that: It includes a dynamic ring and a static ring that match each other in the axial direction. The side of the dynamic ring and the static ring away from the axis is the high-pressure side, and the side close to the axis is the low-pressure side. Dynamic pressure grooves evenly distributed along the circumferential direction are engraved on the end face of the dynamic ring, and the opening position of the dynamic pressure groove is located on the high-pressure side of the end face of the dynamic ring; the fluid enters the sealing gap through the opening position of the dynamic pressure groove, flows through the dynamic pressure groove, and flows out from the low-pressure side of the dynamic ring and the static ring.

2. A dry gas sealing structure of a honeycomb-shaped bionic groove according to claim 1, characterized in that: The dynamic pressure groove includes a plurality of honeycomb-shaped bionic grooves, the number of which increases successively from the high-pressure side to the low-pressure side, and the number of honeycomb stages is 2 to 6; each level of honeycomb-shaped bionic groove includes an outer honeycomb flow channel and an inner boss, and the boss is located at the center of the honeycomb flow channel.

3. The dry gas sealing structure of the honeycomb-shaped bionic groove according to claim 1, characterized in that: The shape of the boss inside the honeycomb flow channel is a regular hexagon, which is the same as the outer contour of the flow channel.

4. The dry gas sealing structure of the honeycomb bionic groove according to claim 2, characterized in that: The number of the honeycomb-shaped bionic grooves uniformly distributed along the circumference of the dynamic pressure groove is 8 to 40.

5. The dry gas sealing structure of the honeycomb bionic groove according to claim 2, characterized in that: The depth of the honeycomb bionic groove is 1 to 50 μm; the depth of each level of groove is the same, or increases or decreases step by step.

6. The dry gas sealing structure of the honeycomb bionic groove according to claim 2, characterized in that: A plurality of micro-textures are arranged at the circumferential position of the honeycomb bionic groove on the sealing end surface, and the micro-textures are circular, elliptical or square.

7. The dry gas sealing structure of the honeycomb bionic groove according to claim 6, characterized in that: The depth of the microtexture is 0.5 to 20 μm.

8. The dry gas sealing structure of the honeycomb bionic groove according to claim 2, characterized in that: An annular pressure stabilizing groove is arranged at the root of the last-stage honeycomb flow channel of the honeycomb-shaped bionic groove dry gas seal, and the dynamic pressure groove is connected with the annular pressure stabilizing groove.

9. A dry gas sealing structure of a honeycomb-shaped bionic groove according to claim 8, characterized in that: The groove depth of the annular pressure stabilizing groove is smaller than the groove depth of the honeycomb-shaped bionic groove, and the inner diameter of the annular pressure stabilizing groove is larger than the inner diameter of the last stage of the honeycomb-shaped bionic groove.

10. The dry gas sealing structure of the honeycomb bionic groove according to claim 8, characterized in that: The groove depth of the annular voltage-stabilizing groove is 2 to 50 μm, and the radial width of the annular voltage-stabilizing groove is 0.5 to 5 mm.

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