CN111306302A - Mechanical sealing end face structure capable of reducing end face abrasion and rotary mechanical equipment - Google Patents

Abstract

The present invention relates to an end face structure of a mechanical seal, comprising a static ring and/or a moving ring, the moving ring is rotatable relative to the static ring, the static ring and/or the moving ring respectively have sealing end faces, and the static ring The sealing end surface on the ring and the sealing end surface on the moving ring can be disposed opposite to each other; a plurality of abrasive grain grooves are provided on the sealing end surface of the static 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. The above-mentioned mechanical seal end face structure and rotating machinery equipment, the abrasive grain groove opened on the sealing end face can store the abrasive grains generated by the low-speed process or the accidental friction of the end face between the moving ring and the static ring, and avoid the abrasive grains causing the circumferential surface of the sealing end face. To scratches and even furrows, under the premise of not significantly reducing the dynamic pressure effect, it can accommodate abrasive particles, zero leakage, stable working performance, long service life, and at the same time ensure better lubrication effect.

Description

Mechanical seal end face structure and rotating machinery that can reduce end face wear

technical field

The invention relates to the technical field of mechanical seals, in particular to an end surface structure of a mechanical seal and a rotating mechanical device capable of reducing end surface wear.

Background technique

The mechanical seal structure is a device that prevents fluid leakage by keeping at least one pair of end faces perpendicular to the axis of rotation, under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal, which keep fit and slide relatively. The mechanical seal structure in the form of a dynamic ring and a static ring realizes a mechanical seal through the combination of dynamic and static pressure. However, when a stable fluid film is not formed during start and stop, the contact wear of the seal end face is large, and the abrasive particles generated after wear will be further generated on the seal end face. Circumferential scratches and even furrows scratch the entire sealing end face; vicious accidents are likely to occur after the sealing end face is rubbed, resulting in seal failure, which brings greater safety hazards, and the adjustment time is short, which cannot be adjusted in time.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a mechanical seal end face structure and rotating machinery equipment that can effectively reduce the wear of the seal end face and ensure the sealing and lubrication effect, aiming at the problems of easy wear and seal failure in the current mechanical seal structure. .

An end face structure of a mechanical seal capable of reducing end face wear, comprising a sealing ring, the sealing ring comprising a static ring and/or a moving ring, the moving ring can rotate relative to the static ring, the static ring and/or the The moving rings respectively have sealing end faces, and the sealing end faces on the static ring and the sealing end faces on the moving ring can be arranged oppositely; the sealing end faces of the static ring and/or the moving ring are provided with openings There are several abrasive grooves.

In one embodiment, a plurality of sealing grooves are formed on the sealing end surface of the stationary ring and/or the moving ring, and a plurality of the abrasive particle grooves are respectively disposed on the outer peripheral edges of the plurality of sealing grooves.

In one of the embodiments, the sealing groove extends in the sealing end face, one end of the sealing groove along its own extending direction forms an upstream side, the upstream side of the sealing groove allows a lubricating medium to flow in, and the sealing The other end of the groove along its own extending direction forms the downstream side; one or more of the abrasive grain grooves are respectively provided on the upstream side outer peripheral edge and/or the downstream side outer peripheral edge of a plurality of the sealing grooves.

In one embodiment, the downstream side of the sealing groove has a downstream tip, and a plurality of the abrasive grain grooves are respectively disposed on the downstream tips of the sealing groove.

In one embodiment, a plurality of the sealing grooves are distributed along the center of the sealing end face to form a single-row structure or a double-row structure with opposite directions of rotation, and a plurality of the abrasive grain grooves are respectively disposed on the downstream side of the plurality of the sealing grooves tip.

In one embodiment, the sealing end face of the stationary ring and/or the moving ring forms a high pressure side and a low pressure side along its radial direction, and a single row of the sealing grooves is opened on the high pressure side or the low pressure side .

In one embodiment, a plurality of the sealing grooves are distributed along the center of the sealing end face to form a double-row structure with opposite directions of rotation, and one or more of the abrasive grain grooves are respectively disposed on the upstream side of at least one row of the sealing grooves Outer periphery or downstream side outer periphery.

In one embodiment, the rotation directions of the sealing grooves of the double-row structure include forward and reverse directions, and the sealing grooves include forward grooves and reverse grooves; The sealing end face forms a high pressure side and a low pressure side along its radial direction, the forward groove is arranged on the high pressure side, and the reverse groove is arranged on the low pressure side; the upstream side of the reverse groove and the A plurality of the abrasive grain grooves are respectively provided on the downstream side, and the plurality of the abrasive grain grooves are distributed at intervals along the outer periphery of the reverse groove.

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

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

In one embodiment, the radial width of the reverse groove along the sealing end face is greater than or equal to the radial width of the forward groove along the sealing end face; the radial ratio of the reverse groove is between Between 0.35-0.45, the radial ratio of the forward groove is between 0.2-0.3.

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

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

In one of the embodiments, a plurality of the sealing grooves are distributed centrally symmetrically along the center of the sealing end face.

In one of the embodiments, based on the sealing end face, the depths of a plurality of the abrasive grain grooves are between 2 μm and 1000 μm.

In one embodiment, the section of the abrasive grain groove perpendicular to its own depth direction includes a smooth section and/or a bent section.

A rotating mechanical equipment includes the mechanical seal end surface structure that can reduce end surface wear according to any one of the above solutions.

The above-mentioned mechanical seal end face structure and rotating machinery equipment that can reduce end face wear, the abrasive grain groove opened on the seal end face can store the abrasive grains generated by the low-speed process or the end face accidental friction between the moving ring and the static ring, avoiding the abrasive grains Circumferential scratches and even furrows on the sealing end face are caused to improve the mechanical sealing performance. The mechanical seal end surface structure and the rotating mechanical equipment which can reduce end surface wear provided by the present invention can accommodate abrasive particles, have zero leakage, have stable working performance, and have a long service life without significantly reducing the dynamic pressure effect. Lubrication effect.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a sealing ring with double-row sealing grooves provided by the first embodiment of the present invention;

Fig. 2 is A-A cross-sectional structure schematic diagram in Fig. 1;

FIG. 3 is a schematic structural diagram of a sealing ring with double-row sealing grooves provided by the second embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a sealing ring with double-row sealing grooves provided by a third embodiment of the present invention;

5 is a schematic structural diagram of a sealing ring with double-row sealing grooves according to a fourth embodiment of the present invention;

6 is a schematic structural diagram of a sealing ring with a single row of sealing grooves according to a fifth embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another sealing ring with a single row of sealing grooves provided by the fifth embodiment of the present invention.

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 ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following description of the specific embodiments is only exemplary, and it should be understood that the specific implementations described herein are only used to explain the present invention, but not to limit the present invention and its application or usage.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. In contrast, when an element is referred to as being "directly" connected to another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

The mechanical seal structure in the form of moving ring and static ring can effectively seal the shaft end of the mechanical equipment. Keeping a clean lubricating environment between the moving ring and the static ring and proper lubricating medium pressure are the effective prerequisites for the mechanical seal structure to achieve lubrication and sealing functions. There will inevitably be some abrasive particles between the moving ring and the static ring due to the direct collision or the pollution of the external environment during the low-speed stage of starting and stopping the mechanical equipment. The invention provides an end surface structure of a mechanical seal that can reduce end surface wear, can avoid the accumulation of abrasive particles on the surface of the sealing end surface, and thus avoid the formation of furrow wear marks on the sealing end surface without significantly reducing the dynamic pressure effect, thereby reducing The end face of the mechanical seal is worn, which prolongs the service life of the seal ring (moving ring or static ring). The end face structure of the mechanical seal which can reduce end face wear provided by the present invention can be applied to the shaft end seal of various rotating mechanical structures, such as compressors, various pumps, mixers and expanders.

As shown in FIGS. 1-2 and 6-7, an embodiment of the present invention provides an end surface structure of a mechanical seal that can reduce end surface wear, including a sealing ring 10, and the sealing ring 10 may include a separate static ring or a dynamic ring , it can also include both dynamic and static rings. The movable ring is rotatable relative to the stationary ring, the stationary ring and/or the movable ring respectively have sealing end surfaces 700 , and the sealing end surfaces 700 on the static ring and the sealing end surfaces 700 on the movable ring can be disposed opposite to each other. A plurality of abrasive grain grooves 100 are opened on the sealing end surface 700 of the static ring and/or the moving ring, and the abrasive grain grooves 100 can accommodate the abrasive grains between the moving ring and the static ring. The above-mentioned mechanical seal end face structure that can reduce end face wear, the abrasive grain groove 100 opened on the sealing end face 700 can store the abrasive grains generated between the moving ring and the static ring by the low-speed process or the accidental rubbing of the end face, so as to avoid the sealing caused by the abrasive grains. Circumferential scratches and even furrows on the end face 700 improve mechanical seal performance. It should be noted that the relative arrangement between the two sealing end surfaces 700 on the static ring and the moving ring means that the sealing end surface 700 of the static ring and the sealing end surface 700 of the moving ring are installed facing each other.

The mechanical seal end surface structure provided in this embodiment can reduce end surface wear, and can accommodate 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 should be further explained that, on the one hand, the abrasive grain groove 100 can store grinding debris (abrasive grains) generated due to contact friction, protect the surface of the sealing ring 10 (moving ring and/or static ring) from being damaged, and improve the sealing ring 10 service life. On the other hand, since the abrasive groove 100 has a certain volume, it can store a certain amount of lubricating medium, 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 grain groove 100 can store the abrasive grains generated by friction, enhance lubrication, and improve the service life of components, and at the same time, it can realize timely regulation and avoid serious accidents.

As shown in FIGS. 1-2 and 6-7, in an embodiment of the present invention, a plurality of sealing grooves 200 are formed on the sealing end surface 700 of the static ring and/or the moving ring, and a plurality of abrasive particle grooves 100 are respectively provided in a plurality of sealing the outer periphery of the groove 200 . A series of seal grooves 200 with pumping capability are designed on the seal face 700 . The sealing medium is pumped in the tangential direction of the sealing groove 200, and the pumped medium and abrasive particles also enter into the abrasive grain groove 100 on the outer periphery of the sealing groove 200 along the tangential direction of the sealing groove 200, which can reduce significantly Under the premise of dynamic pressure effect, it has the effect of accommodating abrasive particles and reducing end face wear. It effectively avoids that the abrasive particles generated by the wear of the sealing end face 700 cannot be discharged in time, resulting in circumferential scratches and even furrows, and then scratching the entire sealing end face 700. Lead to seal failure, bring greater safety hazards, and problems that cannot be adjusted in time due to the short adjustment time. In some cases, the sealing groove 200 is also referred to as a helical groove, and the extension line of the sealing groove 200 is helical with respect to the central axis of the sealing end face 700 .

As shown in FIGS. 1-2 and 6-7 , in an embodiment of the present invention, the sealing groove 200 extends in the sealing end surface 700 , one end of the sealing groove 200 along its own extending direction forms the upstream side, and the upstream side of the sealing groove 200 The other end of the seal groove 200 in the extending direction thereof is allowed to flow in the lubricating medium to form the downstream side. One or more abrasive grain grooves 100 are respectively provided on the upstream outer peripheral edge and/or the downstream outer peripheral edge of the plurality of seal grooves 200 . Since the sealing groove 200 has the function of pumping the medium during the sealing process, the medium between the moving ring and the static ring generally moves along the extending direction (tangential) of the sealing groove 200, which in turn drives the distance between the moving ring and the static ring. Abrasive grains, grinding chips, etc. between them move together. One or more abrasive grain grooves 100 are provided on the upstream outer peripheral edge and/or the downstream outer peripheral edge of the sealing groove 200 , which can effectively accommodate the abrasive grains moved there into the abrasive grain grooves 100 and prevent the abrasive grains from continuing on the moving ring. It can move between the static ring and the static ring, thereby avoiding circumferential scratches or even furrows on the sealing end surfaces 700 of the static ring and the moving ring, and even scratching the entire sealing end surface 700 . Further, the downstream side of the sealing groove 200 has a downstream tip, and the plurality of abrasive grain grooves 100 are respectively disposed at the downstream tip of the plurality of sealing grooves 200 . Due to the structural features of the sealing groove 200 , the downstream tip of the sealing groove 200 will gather more abrasive particles, and opening the abrasive particle groove 100 here can more efficiently accommodate the abrasive particles from between the abrasive particle sealing end faces 700 . transfer.

It can be understood that the sealing groove 200 formed on the sealing end face 700 generally has a certain rotational direction, and the sealing groove 200 with different rotational directions can allow or hinder the flow of the medium, thereby generating a relatively uniform medium between the entire sealing end face 700 layer to maintain better lubrication and sealing properties. Optionally, as shown in FIGS. 1-2 and 6-7 , 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 directions of rotation. The position and quantity relationship between the sealing grooves 200 and the abrasive particle grooves 100 involved in the above embodiments are also applicable to the sealing grooves 200 of a single-row structure and the sealing grooves 200 of a double-row structure with opposite rotation directions. Regardless of whether it is the sealing groove 200 with a single-row structure or the sealing groove 200 with a double-row structure with opposite rotation directions, a plurality of abrasive grain grooves 100 can be respectively disposed at any position on the outer periphery of the upstream side, any position on the downstream side, or the downstream side of the sealing groove 200 . The tip or any other location on the outer periphery of the sealing groove 200 . In each embodiment of the present invention, the direction in which the upstream side points to the downstream side is a clockwise direction.

In each of the above embodiments, the sealing groove 200 of the sealing end face 700 can be processed by laser machining, electrochemical corrosion, electrical discharge machining, etc., the machining accuracy can be detected by a contact profilometer or a non-contact optical profilometer, and abrasive grains can be set. The depth of the groove 100 is greater than the depth of the sealing groove 200 . In the above embodiments, when the moving ring rotates, the medium will be pumped along the tangential direction of the sealing groove 200 from the upstream side of the sealing groove 200 to the downstream side of the sealing groove 200. Due to the sealing weir area 300 and the sealing dam The throttling effect of the zone 400 increases the local pressure of the sealing end face 700 to form an opening force. When the sealing end surface 700 enters the abrasive particles generated by the external medium or the end surface is worn, 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. The amount of abrasive particles, and its depth will be deeper than that of the sealing groove 200 area, reducing the damage of the abrasive particles to the sealing end face 700 .

As shown in FIGS. 1-2 and 6-7 , in an embodiment of the present invention, a plurality of sealing grooves 200 are distributed centrally symmetrically along the center of the sealing end surface 700 . For a single row of sealing grooves 200 , the plurality of sealing grooves 200 are symmetrically distributed around the center of the sealing end face 700 ; for the sealing grooves 200 with a double row structure, each row of sealing grooves 200 is respectively centrally symmetric around the center of the sealing end face 700 . The two rows of sealing grooves 200 are spaced apart or adjacent to each other along the radial direction of the sealing end face 700 . It can be understood that the “column” in this embodiment refers to the center of the sealing end face 700 as the center, the sealing grooves 200 with the same center distance are one column, and the sealing grooves 200 with different center distances belong to different columns. A plurality of sealing grooves 200 are arranged along the center of the sealing end surface 700 to be symmetrically distributed, which can enhance the uniformity of the medium pumped by the sealing grooves 200 on the sealing end surface 700 . Optionally, the number of the sealing grooves 200 in each row on the sealing end face 700 is between 6-100.

As shown in FIGS. 6-7 , in an embodiment of the present invention, the sealing end surface 700 of the static ring and/or the moving ring forms a high pressure side and a low pressure side along its radial direction, and a single row of sealing grooves 200 is opened on the high pressure side or the low pressure side. In general, the side close to the outer side in 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 on the high pressure side is closer to the sealing end face 700 than the upstream side. At the center, the downstream side of the seal groove 200 on the low pressure side is closer to the outside of the seal end face 700 than the upstream side. The above-mentioned two arrangement positions of the single-row sealing groove 200 can effectively realize the pumping of the medium and thus realize an effective mechanical seal. Further, an abrasive grain groove 100 is respectively provided at the downstream tip of the sealing groove 200 at the above two places, so as to realize the storage of abrasive grains between the moving ring and the static ring. The non-groove area between the sealing grooves 200 in the same row forms the sealing weir area 300 , and the non-groove area along the radial direction between the sealing grooves 200 in the non-same row is called the sealing dam area 400 . For the single-row sealing groove 200 structure, the number of grooves is 6-100 (only 12 are shown in the figure), the helix angle of the wall line is 5°-50°, the radial groove-dam ratio is 1-5, and the circumferential groove and weir is 1-5. The 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 (moving ring or static ring), and the groove depth of the sealing groove 200 is 5 μm-100 μm. The abrasive grain groove 100 at the tip of the downstream side of the sealing groove 200 has a depth of 2 μm-1000 μm and an inner diameter of 0.2 mm-2 mm with the plane of the sealing dam region 400 as a reference.

As shown in FIGS. 1-5 , in an 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 directions of rotation, and one or more abrasive grain grooves 100 are respectively disposed in at least one row of the sealing The upstream outer peripheral edge or the downstream outer peripheral edge of the groove 200 . For the double-row seal grooves 200 , one or more abrasive particle grooves 100 may be provided only at the position corresponding to one row of the seal grooves 200 , or one or more abrasive particle grooves 100 may be respectively provided at the corresponding positions of the two rows of the seal grooves 200 . Further, the rotation direction of the sealing groove 200 of the double-row structure includes forward and reverse directions, and the sealing groove 200 includes a forward groove 210 and a reverse groove 220 . The sealing end face 700 of the static ring and/or the moving ring forms a high pressure side and a low pressure side along its 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 disposed on the high pressure side, and the reverse groove 220 is disposed on the low pressure side.

As shown in FIG. 4 , a plurality of abrasive grain grooves 100 are respectively provided on the upstream side and downstream side of the reverse groove 220 , and the plurality of abrasive grain grooves 100 are distributed at intervals 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 provision of a plurality of abrasive grain grooves 100 on the upstream side and the downstream side of the reverse groove 220 can effectively accommodate the abrasive grains moved there into the abrasive grain grooves 100 . . Further, as shown in FIG. 5 , a plurality of abrasive grain grooves 100 are arranged on the downstream side of the forward groove 210 , and the plurality of abrasive grain grooves 100 are distributed at intervals along the outer periphery of the forward groove 210 to further enhance the abrasive grain grooves 100 . particle storage capacity.

Reasonably setting 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 grain groove 100 to accommodate the abrasive grains. In an embodiment of the present invention, as shown in FIGS. 1-3 , 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 reverse groove 220 along the sealing end surface 700 has a circumferential length. The radial width of the 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 ratio of the reverse slot 220 is between 0.35-0.45, and the radial ratio of the forward slot 210 is between 0.2-0.3. Specifically, for the double-row sealing groove 200 structure, a series of forward sealing grooves 200 on the high-pressure side of the sealing end face 700, the number of grooves is 6-100 (only 12 are shown in the figure), and the helix angle of the wall line 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 forward sealing groove 200 accounts for 1/5-1/2 of the radial width of the sealing ring 10, the forward direction The groove depth of the sealing groove 200 is 5 μm-100 μm; a row of reverse sealing grooves 200 on the low pressure side of the end face of the sealing ring 10, the number of grooves is 6-100, the helix angle of the wall line is 10°-50°, and the radial groove-dam ratio is 1- 5. The circumferential groove and weir ratio is 0.25-4, and the groove depth of the reverse sealing groove 200 is 5 μm-100 μm. The abrasive grain groove 100 at the tip of the downstream side of the sealing groove 200 has a depth of 2 μm-1000 μm and an inner diameter of 0.2 mm-2 mm based on the plane of the sealing dam 400 .

It can be understood that the radial ratio in the above embodiments refers to the ratio of the width of the sealing groove 200 in the radial direction to the width of the surface of the sealing ring 10 in the radial direction, and the radial groove-dam ratio is the radial groove 200 along the diameter. The ratio of the width in the radial direction to the width of the sealing weir region 400 in the radial direction; the circumferential groove weir ratio is the ratio of the length of the sealing groove 200 in the circumferential direction to the length of the sealing weir region 300 in the circumferential direction.

In each of the above embodiments, the line connecting the groove wall of the sealing groove 200 includes a logarithmic spiral, an Archimedes spiral, a straight line and/or a circular arc, and the connecting line of the groove wall 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 helical direction, so as to achieve effective sealing between the sealing end faces 700 . Further, for a single sealing groove 200, the connecting line of the groove wall may include one or more of logarithmic spirals, Archimedes spirals, straight lines or circular arcs (the groove wall of a single sealing groove 200 A line is formed by connecting different linetype segments). In the above embodiments, based on the sealing end face 700 (or the sealing weir region 300 ), the depths of the abrasive grain grooves 100 are between 2 μm and 1000 μm, and the depth of the abrasive grain grooves 100 can be designed according to actual working conditions. In the above embodiments, the cross section of the abrasive grain groove 100 perpendicular to its own depth direction includes a smooth cross section and/or a curved cross section, such as a circle, a triangle, a quadrangle or other regular or irregular shapes. Further, the cross section of the abrasive grain groove 100 perpendicular to its own depth direction simultaneously includes a circle, a triangle or a quadrangle, and the abrasive grain groove 100 is divided into several sections with different cross sections along its own depth direction.

An embodiment of the present invention also provides a rotary mechanical device, including the mechanical seal end surface structure that can reduce end surface wear according to any one of the above solutions. The mechanical seal end surface structure and the rotating mechanical equipment that can reduce end surface wear described in each of the above embodiments have at least the following technical effects:

(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 debris, avoid end face damage or circumferential furrows caused by the accumulation of abrasive particles, and improve the sealing ring 10 (dynamic ring or static ring). ring) life;

(2) Under the condition of repeated starting and stopping, 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 starting and stopping process, and improve the sealing ring 10 ( The service life of dynamic ring or static ring) reduces the occurrence of vicious accidents caused by abrasive particles, and has significant economic benefits;

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

(4) The area of the sealing end face 700 occupied by the abrasive grain groove 100 is small, and on the premise of accommodating abrasive grains and reducing wear, the dynamic pressure effect of the sealing groove 200 is not significantly reduced.

The end surface structure of the mechanical seal that can reduce end surface wear provided by the present invention will be described below with specific examples.

Specific embodiment 1: As shown in Figures 1 and 2, the mechanical seal end surface structure that can accommodate abrasive particles and can reduce end surface wear includes designing on one or two opposite sealing end surfaces 700 of the moving ring and the static ring to The sealing end face 700 has a double-row sealing groove 200 structure symmetrically distributed at the center of the circle. The high pressure side of the dynamic or static ring seal end surface 700 is called the high pressure side, and the low pressure side of the dynamic or static ring seal end surface 700 is called the low pressure side. When the double-row sealing groove 200 structure is adopted, the sealing grooves 200 can be divided into two types of sealing grooves 200 with opposite helix angle directions. The sealing groove 200 is a reverse groove 220 . The non-groove area between the forward and reverse sealing grooves 200 in the same row is called the sealing weir area 300 , the non-groove area between the forward and reverse non-same row sealing grooves 200 is called the sealing dam area 400 , and the concave area at one end of the sealing groove 200 The grooves are referred to as cylindrical-like abrasive particle grooves 100 .

The groove wall line of the sealing groove 200 is an arc line. The number of grooves in the forward groove 210 is 6-100, the helix angle of the wall line is 5°-50°, the radial groove-dam ratio is 1-5, the circumferential groove-dam ratio is 0.25-4, and the radial width of the forward groove 210 1/5-1/2 of the radial width of the sealing ring 10, the depth h4 of the forward groove 210 is 5 μm-100 μm. The number of reverse grooves 220 is 6-100, the helix angle of the wall line is 10°-50°, the radial groove-dam ratio is 1-5, the circumferential groove-dam ratio is 0.25-4, and the depth h1 of the reverse groove 220 is 5μm-100μm. A quasi-cylindrical abrasive grain groove 100 is designed at the groove root tips of the forward groove 210 and the reverse groove 220 respectively. The reverse groove 220 corresponds to the depth h2 of the abrasive grain groove 100 and the forward groove 210 corresponds to the depth h3 of the abrasive grain groove 100. Between 5μm-1000μm, the diameter is 0.2mm-2mm, the depth of the cylindrical-like abrasive groove 100 is based on the plane of the sealing dam area 400, and the depth of the sealing groove 200 and the abrasive groove 100 can be adjusted appropriately, such as cylindrical-like The depth of the shaped abrasive groove 100 may be higher than the depth of the sealing groove 200 , may be lower than the depth of the sealing groove 200 , or may be equal to the depth of the sealing groove 200 .

Specific embodiment 2: As shown in FIG. 3, the difference from specific example 1 is that in specific example 2, the cylindrical-like abrasive grain groove 100 in specific example 1 is replaced with a triangular prism-like abrasive grain groove 100, and the same It can also be replaced with a sealing groove 200 in the shape of a square, a rhombus, or the like.

Embodiment 3: As shown in FIG. 4 , the difference from Embodiment 1 is that in the structure of the double-row sealing groove 200 in Embodiment 3, the forward groove 210 does not have the cylindrical abrasive particle groove 100 , but A plurality of cylindrical abrasive grain grooves 100 are added on the upstream side and the downstream side of the reverse groove 220 . As shown in FIG. 4 , the number of quasi-cylindrical abrasive grain grooves 100 at the outer peripheral edge of each reverse groove 220 is 5-20, provided that there is no mutual interference. On the one hand, the increase in the number of cylindrical-like abrasive grain grooves 100 can adapt to repeated start and stop conditions, and can reduce wear and extend the sealing ring 10 (dynamic ring or static ring) without significantly reducing the dynamic pressure effect of the sealing end face 700. service life and improve the performance of the mechanical seal.

Specific embodiment 4: As shown in FIG. 5 , the difference from the specific embodiment 3 is that a plurality of cylindrical grinding mills are added to the downstream side groove root of the forward groove 210 of the four double-row sealing grooves 200 of the specific embodiment. The grain groove 100 can accommodate more abrasive grains without significantly reducing the dynamic pressure effect, thereby prolonging the service life of the sealing ring 10 (dynamic ring or static ring).

Embodiment 5: As shown in FIG. 6 , the difference from Embodiment 1 is that in Embodiment 5, there is only a single row of sealing grooves 200 . Abrasive groove 100 . In other cases, the single row of sealing grooves 200 may also be on the low pressure side, as shown in FIG. 7 .

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (13)

1. An end surface structure of a mechanical seal capable of reducing end surface wear, characterized in that it includes a sealing ring, the sealing ring includes a static ring and/or a moving ring, the moving ring can rotate relative to the static ring, and the static ring The ring and/or the moving ring respectively have sealing end faces, and the sealing end faces on the static ring and the sealing end faces on the moving ring can be arranged opposite to each other; A number of abrasive grain grooves are opened on the sealing end surface. 2. The mechanical seal end face structure capable of reducing end face wear according to claim 1, wherein a plurality of sealing grooves are provided on the sealing end face of the static ring and/or the moving ring, and a plurality of the sealing The grooves are distributed symmetrically along the center of the sealing end face; a plurality of the abrasive grain grooves are respectively arranged on the outer periphery of the sealing grooves; the sealing groove extends in the sealing end face, and the sealing groove extends along itself One end of the direction forms the 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 the downstream side; the upstream outer peripheral edge and/or the downstream side of a plurality of the sealing grooves One or more of the abrasive grain grooves are respectively provided on the outer periphery. 3 . The mechanical seal end surface structure capable of reducing end surface wear according to claim 2 , wherein 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 directions of rotation. 4 . The downstream side of the sealing groove has a downstream tip, and a plurality of the abrasive grain grooves are respectively provided at the downstream tips of the plurality of the sealing grooves. 4. The mechanical seal end face structure capable of reducing end face wear according to claim 3, wherein the sealing end face of the static ring and/or the movable ring forms a high pressure side and a low pressure side along its radial direction, A single row of the 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, wherein a plurality of the sealing grooves are distributed along the center of the sealing end face to form a double row structure with opposite directions of rotation, and one or more of the sealing grooves are arranged in opposite directions. The abrasive grain grooves are respectively provided on the upstream outer peripheral edge or the downstream outer peripheral edge 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 , wherein the rotation directions of the sealing grooves of the double-row structure include forward and reverse directions, and the sealing grooves include a forward groove and a reverse direction. 7 . 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 radial direction, the forward groove is arranged on the high pressure side, and the reverse groove is arranged on the The low pressure side; the upstream side and the downstream side of the reverse groove are respectively provided with a plurality of the abrasive grain grooves, and the plurality of the abrasive grain grooves are distributed at intervals along the outer periphery of the reverse groove. 7 . The end face structure of a mechanical seal capable of reducing end face wear according to claim 6 , wherein a plurality of the abrasive grain grooves are arranged on the downstream side of the forward groove, and the plurality of the abrasive grain grooves are along the The outer peripheries of the forward grooves are spaced apart. 8 . The mechanical seal end surface structure capable of reducing end surface wear according to claim 6 , wherein the circumferential length of the reverse groove along the sealing end surface is greater than or equal to the length of the forward groove along the sealing end surface. 9 . Circumferential length; the radial width of the reverse groove along the sealing end face is greater than or equal to the radial width of the forward groove along the sealing end face; the radial ratio of the reverse groove is between 0.35- 0.45, and the radial ratio 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 claim 2 , wherein the depth of the abrasive grain groove is greater than, equal to or smaller than the depth of the sealing groove. 10 . 10. The mechanical seal end surface structure capable of reducing end surface wear according to any one of claims 2-8, wherein the groove wall connection line of the sealing groove comprises a logarithmic spiral, an Archimedes spiral, Straight and/or circular lines. 11. The mechanical seal end surface structure capable of reducing end surface wear according to any one of claims 1 to 8, characterized in that, based on the sealing end surface, the depth of a plurality of the abrasive grain grooves is between 2μm-1000μm between. 12. The mechanical seal end face structure capable of reducing end face wear according to any one of claims 1-8, characterized in that, a cross section of the abrasive grain groove perpendicular to its own depth direction includes a smooth cross section and/or a bent cross section. 13. A rotating mechanical device, characterized in that it comprises the mechanical seal end surface structure capable of reducing end surface wear according to any one of claims 1-12.

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