Mechanical seal end face structure and rotating mechanical equipment capable of reducing end face wear

Abstract

The present invention relates to a mechanical seal end face structure, comprising a stationary ring and / or a moving ring, wherein the moving ring can rotate relative to the stationary ring, and the stationary ring and / or the moving ring respectively have sealing end faces, wherein the sealing end faces on the stationary ring and the sealing end faces on the moving ring can be arranged relative to each other; and a plurality of abrasive grain grooves are provided on the sealing end faces of the stationary ring and / or the moving ring. The present invention also relates to a rotary mechanical device comprising the above-mentioned mechanical seal end face structure. In the above-mentioned mechanical seal end face structure and the rotary mechanical device, the abrasive grain grooves provided on the sealing end faces can store abrasive grains generated by a low-speed process or accidental friction of the end faces between the moving ring and the stationary ring, thereby avoiding circumferential scratches or even furrows on the sealing end faces caused by abrasive grains, and can achieve the goal of accommodating abrasive grains, achieving zero leakage, stable working performance, and long service life without significantly reducing the dynamic pressure effect, while ensuring a better lubrication effect.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical seals, and in particular to a mechanical seal end face structure and a rotating mechanical device capable of reducing end face wear. Background Art

[0002] The mechanical seal structure is a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of auxiliary seals. The mechanical seal structure in the form of a dynamic ring and a static ring realizes mechanical sealing through the combination of dynamic and static pressure, but the contact wear of the sealing end face is large when a stable fluid film is not formed during start-up and shutdown, and the abrasive particles produced after wear will further produce circumferential scratches or even furrows on the sealing end face, scratching the entire sealing end face; the friction of the sealing end face is prone to serious accidents, resulting in seal failure, bringing great safety hazards, and the adjustment time is short, and it cannot be adjusted in time. Summary of the invention

[0003] Based on this, it is necessary to provide a mechanical seal end face structure and rotating mechanical equipment that can effectively reduce the wear of the seal end face and thus ensure the sealing and lubrication effect, in order to address the problems of easy wear and sealing failure in the current mechanical seal structure.

[0004] A mechanical seal end face structure capable of reducing end face wear comprises a sealing ring, wherein the sealing ring comprises a stationary ring and / or a dynamic ring, the dynamic ring being rotatable relative to the stationary ring, the stationary ring and / or the dynamic ring respectively having a sealing end face, the sealing end face on the stationary ring and the sealing end face on the dynamic ring being capable of being arranged relative to each other; a plurality of abrasive grooves are provided on the sealing end faces of the stationary ring and / or the dynamic ring.

[0005] In one of the embodiments, a plurality of sealing grooves are provided on the sealing end surface of the stationary ring and / or the dynamic ring, and a plurality of abrasive grooves are respectively arranged on the outer peripheries of a plurality of the sealing grooves.

[0006] In one of the embodiments, the sealing groove extends within the sealing end face, and one end of the sealing groove along its own extension direction forms an upstream side, the upstream side of the sealing groove allows the lubricating medium to flow into, and the other end of the sealing groove along its own extension direction forms a downstream side; one or more abrasive grooves are respectively provided on the outer periphery of the upstream side and / or the outer periphery of the downstream side of several of the sealing grooves.

[0007] In one embodiment, the downstream side of the sealing groove has a downstream tip, and a plurality of the abrasive grooves are respectively disposed at the downstream tips of a plurality of the sealing grooves.

[0008] In one embodiment, a plurality of the sealing grooves are distributed along the center of the sealing end surface to form a single-row structure or a double-row structure with opposite rotation directions, and a plurality of the abrasive grooves are respectively disposed at the downstream tips of a plurality of the sealing grooves.

[0009] In one embodiment, the sealing end faces of the stationary ring and / or the dynamic ring form a high-pressure side and a low-pressure side along their own radial direction, and a single row of sealing grooves is opened on the high-pressure side or the low-pressure side.

[0010] In one embodiment, a plurality of the sealing grooves are distributed along the center of the sealing end surface to form a double-row structure with opposite rotation directions, and one or more abrasive grooves are respectively arranged on the upstream outer periphery or the downstream outer periphery of at least one row of the sealing grooves.

[0011] In one of the embodiments, the rotation direction of the sealing groove of the double-row structure includes forward and reverse, and the sealing groove includes a forward groove and a reverse groove; the sealing end surface of the static ring and / or the dynamic ring forms a high-pressure side and a low-pressure side along its own radial direction, the forward groove is arranged on the high-pressure side, and the reverse groove is arranged on the low-pressure side; a plurality of the abrasive grooves are respectively arranged on the upstream side and the downstream side of the reverse groove, and the plurality of the abrasive grooves are spaced apart and distributed along the outer periphery of the reverse groove.

[0012] In one of the embodiments, a plurality of abrasive grain grooves are provided on the downstream side of the forward groove, and the plurality of abrasive grain grooves are distributed at intervals along the outer periphery of the forward groove.

[0013] In one embodiment, the circumferential length of the reverse groove along the sealing end surface is greater than or equal to the circumferential length of the forward groove along the sealing end surface.

[0014] In one embodiment, the radial width of the reverse groove along the sealing end surface is greater than or equal to the radial width of the forward groove along the sealing end surface; the radial proportion of the reverse groove is between 0.35-0.45, and the radial proportion of the forward groove is between 0.2-0.3.

[0015] In one embodiment, the depth of the abrasive groove is greater than, equal to, or less than the depth of the sealing groove.

[0016] In one embodiment, the groove wall connecting line of the sealing groove includes a logarithmic spiral line, an Archimedean spiral line, a straight line and / or a circular arc line.

[0017] In one embodiment, a plurality of the sealing grooves are distributed symmetrically along the center of the sealing end surface.

[0018] In one embodiment, based on the sealing end surface, the depths of the plurality of abrasive grooves are between 2 μm and 1000 μm.

[0019] In one embodiment, the cross section of the abrasive groove perpendicular to its depth direction includes a smooth cross section and / or a bent cross section.

[0020] A rotating mechanical device comprises a mechanical seal end face structure capable of reducing end face wear as described in any one of the above schemes.

[0021] The mechanical seal end face structure and rotating mechanical equipment capable of reducing end face wear, the abrasive particle grooves provided on the seal end face can store abrasive particles generated by the low-speed process or accidental friction between the dynamic ring and the static ring, avoiding circumferential scratches or even furrows on the seal end face caused by abrasive particles, and improving the mechanical seal performance. The mechanical seal end face structure and rotating mechanical equipment capable of reducing end face wear provided by the present invention can achieve the purpose of accommodating abrasive particles, achieving zero leakage, stable working performance, and long service life without significantly reducing the dynamic pressure effect, while ensuring a better lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a sealing ring with double rows of sealing grooves provided in the first embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section;

[0026] Figure 3 A schematic diagram of the structure of a sealing ring with double rows of sealing grooves provided in a second embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the structure of a sealing ring with double rows of sealing grooves provided in a third embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of a sealing ring with double rows of sealing grooves provided in a fourth embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a sealing ring structure with a single row of sealing grooves provided in a fifth embodiment of the present invention;

[0030] Figure 7 A schematic diagram of another sealing ring structure with a single row of sealing grooves provided in a fifth embodiment of the present invention.

[0031] Among them: 10, sealing ring; 100, abrasive groove; 200, sealing groove; 210, forward groove; 220, reverse groove; 300, sealing weir area; 400, sealing dam area; 700, sealing end face. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The following description of the specific implementation is merely exemplary, and it should be understood that the specific implementation described herein is only used to explain the present invention, and is by no means a limitation of the present invention and its application or usage.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. On the contrary, when an element is referred to as being "directly" connected to another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] The mechanical seal structure in the form of a moving ring and a stationary ring can effectively seal the shaft end of the mechanical equipment. Maintaining a clean lubricating environment between the moving ring and the stationary ring and a suitable lubricating medium pressure are effective prerequisites for the mechanical seal structure to achieve lubrication and sealing functions. Due to direct collision between the moving ring and the stationary ring during the low-speed stage of starting and stopping the mechanical equipment or pollution from the external environment, some abrasive particles will inevitably exist between the moving ring and the stationary ring. The present invention provides a mechanical seal end face structure that can reduce end face wear. Without significantly reducing the dynamic pressure effect, it can avoid the accumulation of abrasive particles on the surface of the sealing end face and further avoid the formation of plowing wear marks on the sealing end face, thereby reducing mechanical seal end face wear and extending the service life of the sealing ring (moving ring or stationary ring). The mechanical seal end face structure that can reduce end face wear provided by the present invention can be applied to shaft end seals of various rotating mechanical structures, such as compressors, various pumps, mixers, and expanders.

[0036] like Figure 1-2 and Figure 6-7 As shown, an embodiment of the present invention provides a mechanical seal end face structure capable of reducing end face wear, including a sealing ring 10. The sealing ring 10 may include a single static ring or a dynamic ring, or may include both a dynamic ring and a static ring. The dynamic ring may rotate relative to the static ring. The static ring and / or the dynamic ring respectively have a sealing end face 700. The sealing end face 700 on the static ring and the sealing end face 700 on the dynamic ring may be arranged relative to each other. A plurality of abrasive grain grooves 100 are provided on the sealing end face 700 of the static ring and / or the dynamic ring. The abrasive grain grooves 100 may accommodate abrasive grains between the dynamic ring and the static ring. In the above mechanical seal end face structure capable of reducing end face wear, the abrasive grain grooves 100 provided on the sealing end face 700 may store abrasive grains generated by a low-speed process or accidental friction between the dynamic ring and the static ring, thereby avoiding circumferential scratches or even furrows on the sealing end face 700 caused by abrasive grains, and improving mechanical sealing performance. It should be noted that the relative arrangement between the two sealing end faces 700 on the stationary ring and the dynamic ring refers to the sealing end face 700 of the stationary ring and the sealing end face 700 of the dynamic ring being installed face to face.

[0037] The mechanical seal end face structure that can reduce end face wear provided in this embodiment can achieve the accommodation of abrasive particles, zero leakage, stable working performance, and long service life without significantly reducing the dynamic pressure effect, while ensuring a better lubrication effect. It needs to be further explained that, on the one hand, the abrasive particle groove 100 can store grinding chips (abrasive particles) generated by contact friction, protect the surface of the sealing ring 10 (dynamic ring and / or static ring) from being damaged, and increase the service life of the sealing ring 10. On the other hand, due to the certain volume of the abrasive particle groove 100, a certain amount of lubricating medium can be stored, which improves the lubrication performance of the sealing ring 10 and reduces the wear of the sealing end face 700. In the process of repeated starting and stopping, the abrasive particle groove 100 can store abrasive particles generated by friction, enhance lubrication, and increase the service life of parts. At the same time, timely regulation can be achieved to avoid serious accidents.

[0038] like Figure 1-2 and Figure 6-7 As shown, in one embodiment of the present invention, a plurality of sealing grooves 200 are provided on the sealing end face 700 of the stationary ring and / or the dynamic ring, and a plurality of abrasive grooves 100 are respectively provided on the outer periphery of the plurality of sealing grooves 200. A series of sealing grooves 200 with pumping capability are designed on the sealing end face 700. The sealing medium is pumped in along the tangential direction of the sealing groove 200, and the pumped medium and abrasive grains also enter the abrasive grain grooves 100 on the outer periphery of the sealing groove 200 along the tangential direction of the sealing groove 200, which can accommodate the abrasive grains and reduce the wear of the end face without significantly reducing the dynamic pressure effect. It effectively avoids the situation that the abrasive grains generated after the sealing end face 700 is worn cannot be discharged in time, circumferential scratches or even furrows are generated, and then the entire sealing end face 700 is scratched. At the same time, it avoids the problem that the sealing end face 700 is prone to serious accidents, sealing failure, greater safety hazards, and the problem that the adjustment time is short and the adjustment time cannot be adjusted in time. In some cases, the sealing groove 200 is also called a spiral groove, and the extension line of the sealing groove 200 is spiral relative to the central axis of the sealing end surface 700 .

[0039] like Figure 1-2 and Figure 6-7 As shown, in one embodiment of the present invention, the sealing groove 200 extends in the sealing end face 700, and one end of the sealing groove 200 along its own extension direction forms an upstream side, and the upstream side of the sealing groove 200 allows the lubricating medium to flow in, and the other end of the sealing groove 200 along its own extension direction forms a downstream side. One or more abrasive grooves 100 are respectively provided on the outer periphery of the upstream side and / or the outer periphery of the downstream side of a plurality of sealing grooves 200. Since the sealing groove 200 has the function of pumping the medium during the sealing process, the medium between the dynamic ring and the static ring generally moves along the extension direction (tangential direction) of the sealing groove 200, thereby also driving the abrasive particles, grinding chips, etc. between the dynamic ring and the static ring to move together. One or more abrasive grain grooves 100 are provided on the outer peripheral edge of the upstream side and / or the outer peripheral edge of the downstream side of the sealing groove 200, so that the abrasive grains moved thereto can be effectively accommodated in the abrasive grain grooves 100, so as to prevent the abrasive grains from continuing to move between the dynamic ring and the static ring, thereby preventing the generation of circumferential scratches or even furrows on the sealing end faces 700 of the static ring and the dynamic ring, or even scratching the entire sealing end face 700. Furthermore, the downstream side of the sealing groove 200 has a downstream tip, and a plurality of abrasive grain grooves 100 are respectively provided at the downstream tips of a plurality of sealing grooves 200. Due to the structural characteristics of the sealing groove 200, a large number of abrasive grains will gather at the downstream tip of the sealing groove 200, and the abrasive grain grooves 100 provided here can more efficiently accommodate the abrasive grains and transfer them from between the abrasive grain sealing end faces 700.

[0040] It can be understood that the sealing groove 200 formed on the sealing end face 700 generally has a certain rotation direction. The sealing groove 200 with different rotation directions can allow or hinder the flow of the medium, thereby generating a relatively uniform medium layer between the entire sealing end face 700 to maintain better lubrication and sealing performance. Figure 1-2 and Figure 6-7 As shown, a plurality of sealing grooves 200 are distributed along the center of the sealing end surface 700 to form a single-row structure or a double-row structure with opposite rotation directions. The position and quantity relationship between the sealing grooves 200 and the abrasive grooves 100 involved in the above-mentioned various embodiments are also applicable to the sealing grooves 200 with a single-row structure and the sealing grooves 200 with a double-row structure with opposite rotation directions. Regardless of the sealing grooves 200 with a single-row structure or the sealing grooves 200 with a double-row structure with opposite rotation directions, a plurality of abrasive grooves 100 can be respectively arranged at any position of the outer periphery of the upstream side of the sealing groove 200, any position of the downstream side, the tip of the downstream side or any other position of the outer periphery of the sealing groove 200. In the various embodiments of the present invention, the direction from the upstream side to the downstream side is the clockwise direction.

[0041] In the above embodiments, the sealing groove 200 of the sealing end face 700 can be processed by laser processing, electrochemical corrosion, electric spark processing and other processes, and the processing accuracy can be detected by using a contact profiler or a non-contact optical profiler, and the depth of the abrasive groove 100 is set to be greater than the depth of the sealing groove 200. In the above embodiments, when the movable ring rotates, the medium will be pumped from the upstream side of the sealing groove 200 to the downstream side of the sealing groove 200 along the tangential direction of the sealing groove 200. Due to the throttling effect of the sealing weir area 300 and the sealing dam area 400, the local pressure of the sealing end face 700 increases, forming an opening force. When the sealing end face 700 enters the abrasive particles generated by the external medium or the end face wear, the abrasive particles will enter the abrasive particle groove 100 along the tangential direction of the sealing groove 200. Since the abrasive particle groove 100 has a certain volume, it can accommodate a certain amount of abrasive particles, and its depth is deeper than that of the sealing groove 200 area, which reduces the damage of the abrasive particles to the sealing end face 700.

[0042] like Figure 1-2 and Figure 6-7As shown, in one embodiment of the present invention, a plurality of sealing grooves 200 are centrally symmetrically distributed along the center of the sealing end face 700. For a single-row sealing groove 200, a plurality of sealing grooves 200 are centrally symmetrically distributed with respect to the center of the sealing end face 700; for a double-row sealing groove 200, each row of sealing grooves 200 are centrally symmetrically distributed with respect to the center of the sealing end face 700, and the two rows of sealing grooves 200 are radially spaced or adjacently arranged along the sealing end face 700. It can be understood that the "row" in this embodiment refers to the sealing grooves 200 with the same center distance as one row, and the sealing grooves 200 with different center distances belong to different rows. Arranging a plurality of sealing grooves 200 centrally symmetrically distributed along the center of the sealing end face 700 can enhance the uniformity of the pumping medium of the sealing grooves 200 on the sealing end face 700. Optionally, the number of sealing grooves 200 in each row on the sealing end face 700 is between 6 and 100.

[0043] like Figure 6-7 As shown, in one embodiment of the present invention, the sealing end face 700 of the static ring and / or the dynamic ring forms a high-pressure side and a low-pressure side along its own radial direction, and the single-row sealing groove 200 is opened on the high-pressure side or the low-pressure side. Generally, the side close to the outer side along the radial direction of the sealing end face 700 is the high-pressure side, and the side close to the inner side is the low-pressure side; and the downstream side of the sealing groove 200 located on the high-pressure side is closer to the center of the sealing end face 700 than the upstream side, and the downstream side of the sealing groove 200 located on the low-pressure side is closer to the outer side of the sealing end face 700 than the upstream side. The two setting positions of the above-mentioned single-row sealing groove 200 can effectively realize the pumping of the medium and thus realize effective mechanical sealing. Further, an abrasive groove 100 is respectively set at the downstream tip of the sealing groove 200 at the above-mentioned two places to realize the storage of abrasives between the dynamic ring and the static ring. The non-groove area between the sealing grooves 200 in the same row forms a sealing weir area 300, and the non-groove area along the radial direction between the sealing grooves 200 in different rows is called a sealing dam area 400. For a single row of sealing grooves 200, the number of grooves is 6-100 (only 12 are shown in the figure), the wall line helix angle is 5°-50°, the radial groove-dam ratio is 1-5, the circumferential groove-dam ratio is 0.25-4, the radial width of the sealing groove 200 accounts for 1 / 6-4 / 5 of the radial width of the sealing ring 10 (dynamic ring or static ring), and the groove depth of the sealing groove 200 is 5μm-100μm. The abrasive groove 100 at the tip of the downstream side of the sealing groove 200 has a depth of 2μm-1000μm based on the plane of the sealing dam area 400, and an inner diameter of 0.2㎜-2mm.

[0044] like Figure 1-5As shown, in one embodiment of the present invention, a plurality of sealing grooves 200 are distributed along the center of the sealing end face 700 to form a double-row structure with opposite rotation directions, and one or more abrasive grooves 100 are respectively arranged at the outer periphery of the upstream side or the outer periphery of the downstream side of at least one row of sealing grooves 200. For the double-row sealing grooves 200, one or more abrasive grooves 100 can be arranged at the position corresponding to only one row of sealing grooves 200, or one or more abrasive grooves 100 can be arranged at the positions corresponding to the two rows of sealing grooves 200. Further, the rotation directions of the sealing grooves 200 of the double-row structure include forward and reverse directions, and the sealing grooves 200 include forward grooves 210 and reverse grooves 220. The sealing end face 700 of the stationary ring and / or the dynamic ring forms a high-pressure side and a low-pressure side along its own radial direction. Generally, the side close to the outer side along the radial direction of the sealing end face 700 is the high-pressure side, and the side close to the inner side is the low-pressure side. The forward groove 210 is arranged on the high-pressure side, and the reverse groove 220 is arranged on the low-pressure side.

[0045] like Figure 4 As shown, a plurality of abrasive grain grooves 100 are respectively arranged on the upstream side and the downstream side of the reverse groove 220, and the plurality of abrasive grain grooves 100 are spaced apart and distributed along the outer periphery of the reverse groove 220. Since the medium moves from the high pressure side to the low pressure side of the sealing end face 700, the plurality of abrasive grain grooves 100 are respectively arranged on the upstream side and the downstream side of the reverse groove 220 to effectively accommodate the abrasive grains moved thereto into the abrasive grain grooves 100. Furthermore, as Figure 5 As shown, a plurality of abrasive grooves 100 are arranged at the downstream side of the forward groove 210 , and the plurality of abrasive grooves 100 are distributed at intervals along the outer periphery of the forward groove 210 , further enhancing the abrasive grain storage capacity of the abrasive grooves 100 .

[0046] Reasonable setting of the position and size relationship between the forward groove 210 and the reverse groove 220 can not only directly improve the sealing performance, but also help the abrasive groove 100 to store abrasives. Figure 1-3As shown, the circumferential length of the reverse groove 220 along the sealing end surface 700 is greater than or equal to the circumferential length of the forward groove 210 along the sealing end surface 700, and the radial width of the reverse groove 220 along the sealing end surface 700 is greater than or equal to the radial width of the forward groove 210 along the sealing end surface 700. The radial proportion of the reverse groove 220 is between 0.35-0.45, and the radial proportion of the forward groove 210 is between 0.2-0.3. Specifically, for the double-row sealing groove 200 structure, a series of positive sealing grooves 200 on the high-pressure side of the sealing end face 700 have 6-100 grooves (only 12 are shown in the figure), a wall line helix angle of 5°-50°, a radial groove-dam ratio of 1-5, a circumferential groove-weir ratio of 0.25-4, and a radial width of the positive sealing groove 200 that accounts for 1 / 5-1 / 2 of the radial width of the sealing ring 10, and a groove depth of the positive sealing groove 200 of 5μm-100μm; a row of reverse sealing grooves 200 on the low-pressure side of the end face of the sealing ring 10 have 6-100 grooves, a wall line helix angle of 10°-50°, a radial groove-dam ratio of 1-5, a circumferential groove-weir ratio of 0.25-4, and a groove depth of the reverse sealing groove 200 of 5μm-100μm. The abrasive groove 100 at the downstream tip of the sealing groove 200 has a depth of 2 μm-1000 μm based on the plane of the sealing dam area 400 and an inner diameter of 0.2 mm-2 mm.

[0047] It can be understood that the radial proportion in the above-mentioned embodiments refers to the ratio of the width of the sealing groove 200 along the radial direction to the width of the sealing ring 10 along the radial direction, the radial groove-dam ratio is the ratio of the width of the sealing groove 200 along the radial direction to the width of the sealing dam area 400 along the radial direction; the circumferential groove-dam ratio is the ratio of the length of the sealing groove 200 along the circumferential direction to the length of the sealing dam area 300 along the circumferential direction.

[0048] In the above embodiments, the groove wall connection line of the sealing groove 200 includes a logarithmic spiral line, an Archimedean spiral line, a straight line and / or an arc line. The groove wall connection line of the sealing groove 200 may also include other line types, as long as the groove wall of the sealing groove 200 can be extended along the set spiral direction, thereby achieving effective sealing between the sealing end faces 700. Further, for a single sealing groove 200, its groove wall connection line may include one or more of a logarithmic spiral line, an Archimedean spiral line, a straight line or an arc line (the groove wall connection line of a single sealing groove 200 is formed by connecting different line segments). In the above embodiments, with the sealing end face 700 (or the sealing weir area 300) as a reference, the depth of a plurality of abrasive grooves 100 is between 2μm and 1000μm, and the depth of the abrasive groove 100 can be designed according to actual working conditions. In the above embodiments, the cross section of the abrasive groove 100 perpendicular to its depth direction includes a smooth cross section and / or a bent cross section, such as a circle, a triangle, a quadrilateral or other regular or irregular shapes. Further, the cross section of the abrasive groove 100 perpendicular to its depth direction includes a circle, a triangle or a quadrilateral at the same time, and the abrasive groove 100 is divided into several sections with different cross sections along its depth direction.

[0049] An embodiment of the present invention further provides a rotating mechanical device, comprising a mechanical seal end face structure capable of reducing end face wear as described in any one of the above schemes. The mechanical seal end face structure capable of reducing end face wear and the rotating mechanical device described in the above embodiments have at least the following technical effects:

[0050] (1) The depth of the abrasive groove 100 at the tip of the sealing groove 200 can reach the millimeter level, which can store a certain amount of grinding chips, avoid end surface damage or circumferential furrows caused by abrasive accumulation, and improve the life of the sealing ring 10 (dynamic ring or static ring);

[0051] (2) Under the condition of repeated start-stop, the abrasive groove 100 at the tip of the sealing groove 200 can store a certain amount of sealing medium, which can effectively reduce the friction and wear of the sealing end face 700 during the start-stop process, increase the service life of the sealing ring 10 (dynamic ring or static ring), and reduce the occurrence of serious accidents caused by abrasive particles, which has significant economic benefits;

[0052] (3) The high stability of the fluid high pressure area and the self-adjustment of the mechanical seal end face structure that can reduce end face wear enable the mechanical seal end face structure that can reduce end face wear provided by the present invention to achieve zero leakage under different working conditions;

[0053] (4) The area of ​​the sealing end surface 700 occupied by the abrasive groove 100 is relatively small, and the dynamic pressure effect of the sealing groove 200 is not significantly reduced while accommodating the abrasive and reducing wear.

[0054] The mechanical seal end face structure capable of reducing end face wear provided by the present invention is described below with reference to specific embodiments.

[0055] Specific embodiment 1: Figure 1 and Figure 2 As shown, a mechanical seal end face structure that can accommodate abrasive particles and reduce end face wear includes a double-row seal groove 200 structure designed on one or two opposite seal end faces 700 of a dynamic ring or a static ring and symmetrically distributed with respect to the center of the seal end face 700. The high-pressure side of the seal end face 700 of the dynamic ring or the static ring is called the high-pressure side, and the low-pressure side of the seal end face 700 of the dynamic ring or the static ring is called the low-pressure side. When a double-row seal groove 200 structure is adopted, the seal groove 200 can be divided into two types of seal grooves 200 with opposite helix angles. A series of seal grooves 200 close to the upstream are defined as forward grooves 210, and the seal grooves 200 with opposite directions to the forward grooves 210 are reverse grooves 220. The non-groove area between the forward and reverse seal grooves 200 in the same row is called the seal weir area 300, the non-groove area between the forward and reverse seal grooves 200 not in the same row is called the seal dam area 400, and the groove at one end of the seal groove 200 is called the quasi-cylindrical abrasive groove 100.

[0056] The groove wall line type of the sealing groove 200 is an arc line, the depth of the forward groove 210 is less than the depth of the reverse groove 220, and the area of ​​the forward groove 210 is also less than the area of ​​the reverse groove 220. The number of the forward groove 210 is 6-100, the wall line helix angle is 5°-50°, the radial groove dam ratio is 1-5, the circumferential groove weir ratio is 0.25-4, the radial width of the forward groove 210 accounts for 1 / 5-1 / 2 of the radial width of the sealing ring 10, and the depth h4 of the forward groove 210 is 5μm-100μm. The number of the reverse groove 220 is 6-100, the wall line helix angle is 10°-50°, the radial groove dam ratio is 1-5, the circumferential groove weir ratio is 0.25-4, and the depth h1 of the reverse groove 220 is 5μm-100μm. A quasi-cylindrical abrasive groove 100 is designed at the root tip of the forward groove 210 and the reverse groove 220 respectively. The depth h2 of the abrasive groove 100 corresponding to the reverse groove 220 and the depth h3 of the abrasive groove 100 corresponding to the forward groove 210 are respectively between 5μm-1000μm, and the diameter is 0.2mm-2mm. The depth of the quasi-cylindrical abrasive groove 100 is based on the plane of the sealing dam area 400. The depths of the sealing groove 200 and the abrasive groove 100 can be appropriately adjusted. For example, the depth of the quasi-cylindrical abrasive groove 100 can be higher than the depth of the sealing groove 200, or lower than the depth of the sealing groove 200, or can be equal to the depth of the sealing groove 200.

[0057] Specific embodiment 2: Figure 3As shown, the difference from the specific example 1 is that the cylindrical abrasive groove 100 in the specific example 1 is replaced by a triangular prism-shaped abrasive groove 100 in the specific example 2. Similarly, it can also be replaced by a sealing groove 200 in a square, diamond or other shape.

[0058] Specific embodiment three: Figure 4 As shown, the difference from the specific embodiment 1 is that in the double-row sealing groove 200 structure in the specific embodiment 3, the forward groove 210 does not have a cylindrical abrasive groove 100, but a plurality of cylindrical abrasive grooves 100 are added on the upstream and downstream sides of the reverse groove 220. Figure 4 As shown, the number of cylindrical abrasive grooves 100 at the outer periphery of each reverse groove 220 is 5-20, provided that there is no interference between them. The increase in the number of cylindrical abrasive grooves 100 can adapt to repeated start-stop conditions, reduce wear, extend the service life of the sealing ring 10 (dynamic ring or static ring), and improve the performance of the mechanical seal without significantly reducing the dynamic pressure effect of the sealing end face 700.

[0059] Specific embodiment 4: Figure 5 As shown, the difference from the specific embodiment three is that a plurality of cylindrical abrasive grooves 100 are added to the downstream groove root of the forward groove 210 of the double-row sealing groove 200 of the specific embodiment four, which can accommodate more abrasives without significantly reducing the dynamic pressure effect, thereby extending the service life of the sealing ring 10 (dynamic ring or static ring).

[0060] Specific embodiment five: Figure 6 As shown, the difference from the specific embodiment 1 is that the specific embodiment 5 has only a single row of sealing grooves 200, the single row of sealing grooves 200 is on the high pressure side, and an abrasive groove 100 is provided at the root of the single row of sealing grooves 200. In other cases, the single row of sealing grooves 200 can also be on the low pressure side, such as Figure 7 shown.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A mechanical seal end face structure capable of reducing end face wear, characterized in that: The invention comprises a sealing ring, wherein the sealing ring comprises a stationary ring and / or a dynamic ring, wherein the dynamic ring can rotate relative to the stationary ring, and wherein the stationary ring and / or the dynamic ring respectively have a sealing end face, wherein the sealing end face on the stationary ring and the sealing end face on the dynamic ring can be arranged opposite to each other; and a plurality of abrasive grain grooves are provided on the sealing end faces of the stationary ring and / or the dynamic ring; A plurality of sealing grooves are provided on the sealing end surface of the static ring and / or the dynamic ring, and the plurality of sealing grooves are centrally symmetrically distributed along the center of the sealing end surface; a plurality of abrasive grooves are respectively arranged on the outer periphery of the plurality of sealing grooves; the sealing groove extends within the sealing end surface, and one end of the sealing groove along its own extension direction forms an upstream side, the upstream side of the sealing groove allows the medium to flow in, and the other end of the sealing groove along its own extension direction forms a downstream side; a sealing dam area is provided downstream of the plurality of sealing grooves, and one or more abrasive grooves are respectively provided on the outer periphery of the downstream side of the plurality of sealing grooves close to the sealing dam area.

2. The mechanical seal end face structure capable of reducing end face wear according to claim 1, characterized in that: One or more abrasive grain grooves are respectively arranged on the outer peripheries of the upstream sides of the plurality of sealing grooves.

3. The mechanical seal end face structure capable of reducing end face wear according to claim 2, characterized in that: The plurality of sealing grooves are distributed along the center of the sealing end surface to form a single-row structure or a double-row structure with opposite rotation directions. The downstream side of the sealing groove has a downstream tip, and the plurality of abrasive grooves are respectively arranged at the downstream tips of the plurality of sealing grooves.

4. The mechanical seal end face structure capable of reducing end face wear according to claim 3, characterized in that: The sealing end faces of the stationary ring and / or the dynamic ring form a high-pressure side and a low-pressure side along their own radial direction, and a single row of sealing grooves is opened on the high-pressure side or the low-pressure side.

5. The mechanical seal end face structure capable of reducing end face wear according to claim 2, characterized in that: A plurality of the sealing grooves are distributed along the center of the sealing end surface to form a double-row structure with opposite rotation directions, and one or more abrasive grooves are respectively arranged on the upstream outer periphery or the downstream outer periphery of at least one row of the sealing grooves.

6. The mechanical seal end face structure capable of reducing end face wear according to claim 5, characterized in that: The rotation direction of the sealing groove of the double-row structure includes forward and reverse, and the sealing groove includes a forward groove and a reverse groove; the sealing end surface of the static ring and / or the dynamic ring forms a high-pressure side and a low-pressure side along its own radial direction, the forward groove is arranged on the high-pressure side, and the reverse groove is arranged on the low-pressure side; a plurality of abrasive grooves are respectively arranged on the upstream side and the downstream side of the reverse groove, and the plurality of abrasive grooves are spaced apart and distributed along the outer periphery of the reverse groove.

7. The mechanical seal end face structure capable of reducing end face wear according to claim 6, characterized in that: A plurality of abrasive grain grooves are arranged on the downstream side of the forward groove, and the plurality of abrasive grain grooves are distributed at intervals along the outer periphery of the forward groove.

8. The mechanical seal end face structure capable of reducing end face wear according to claim 6, characterized in that: The circumferential length of the reverse groove along the sealing end surface is greater than or equal to the circumferential length of the forward groove along the sealing end surface; the radial width of the reverse groove along the sealing end surface is greater than or equal to the radial width of the forward groove along the sealing end surface; the radial proportion of the reverse groove is between 0.35-0.45, and the radial proportion of the forward groove is between 0.2-0.

3.

9. The mechanical seal end face structure capable of reducing end face wear according to any one of claims 2 to 8, characterized in that: The depth of the abrasive groove is greater than, equal to, or less than the depth of the sealing groove.

10. The mechanical seal end face structure capable of reducing end face wear according to any one of claims 2 to 8, characterized in that: The groove wall connection line of the sealing groove includes a logarithmic spiral line, an Archimedean spiral line, a straight line and / or an arc line.

11. The mechanical seal end face structure capable of reducing end face wear according to any one of claims 1 to 8, characterized in that: Taking the sealing end surface as a reference, the depths of the plurality of abrasive grooves are between 2 μm and 1000 μm.

12. The mechanical seal end face structure capable of reducing end face wear according to any one of claims 1 to 8, characterized in that: The cross section of the abrasive groove perpendicular to its depth direction includes a smooth cross section and / or a bent cross section.

13. A rotating mechanical device, characterized in that: The invention comprises a mechanical seal end face structure capable of reducing end face wear as described in any one of claims 1 to 12.

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