A liquid film thrust plate seal structure, thrust plate assembly and screw compressor

Abstract

The application discloses a liquid film thrust disc sealing structure and relates to the technical field of thrust disc sealing technology. The thrust disc sealing structure comprises a mounting seat, one side of the mounting seat is used for mounting a thrust disc body, and the other side of the mounting seat is provided with a dynamic ring. An end cover assembly is internally provided with a static ring matched with the dynamic ring. One side of the dynamic ring opposite to the static ring or one side of the static ring opposite to the dynamic ring is provided with a dynamic pressure groove, so that a liquid film with a certain thickness is formed between the dynamic ring and the static ring, no-friction operation is realized, the labyrinth sealing of the unit thrust disc is replaced, and the continuous operation cycle of the unit is prolonged. The thrust disc assembly comprises the liquid film thrust disc sealing structure and the thrust disc body, and the thrust disc body is installed on the side of the mounting seat far from the static ring. The screw compressor comprises the thrust disc assembly, and the continuous operation cycle of the unit can be prolonged.

Description

Technical Field

[0001] This invention relates to the field of thrust disc sealing technology, specifically to a liquid film thrust disc sealing structure, a thrust disc assembly, and a screw compressor. Background Technology

[0002] The thrust disc is the disc that transmits the axial thrust of the rotor to the thrust bearing. Currently, screw compressor units use labyrinth seals for their thrust discs to maintain rotor axial thrust while reducing the flow rate of the sealing fluid. A smaller clearance results in better throttling, lower sealing fluid flow, and more stable rotor axial thrust; conversely, a larger clearance leads to higher sealing fluid flow and less stable rotor axial thrust. However, due to the large vibration of the screw compressor rotor, the labyrinth seal wear can easily increase, leading to increased sealing fluid flow, fluctuations in rotor axial thrust, and even insufficient rotor axial thrust. Ultimately, this can cause the screw compressor rotor displacement to exceed allowable values, resulting in damage to the compressor unit. Summary of the Invention

[0003] To address the technical problem of significant wear in the labyrinth seals of thrust discs in existing screw compressor units, this invention provides a liquid film thrust disc seal structure, a thrust disc assembly, and a screw compressor. By forming a liquid film between the rotating and stationary rings, the rotating and stationary rings are kept in a non-contact state during thrust disc operation, thereby reducing wear on the thrust disc seal assembly and extending the service life of the thrust disc seal.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a liquid film thrust disk sealing structure, comprising: a mounting base, one side of which is used to mount the thrust disk body, and a rotating ring mounted on the other side of the mounting base; an end cap assembly, the inner side of which is mounted a stationary ring adapted to the rotating ring; wherein a dynamic pressure groove is provided on the side of the rotating ring facing the stationary ring or on the side of the stationary ring facing the rotating ring.

[0006] The liquid film thrust disc sealing structure provided by the present invention has a dynamic pressure groove on the side of the rotating ring facing the stationary ring or the side of the stationary ring facing the rotating ring. The rotation of the thrust disc drives the rotating ring and the stationary ring to rotate relative to each other, thereby bringing the sealing liquid into the dynamic pressure groove to generate a dynamic pressure effect, so as to form a liquid film on the end faces of the rotating ring and the stationary ring. The opening force generated by the dynamic pressure effect pushes the rotating ring and the stationary ring apart to a certain degree, so that the end faces of the rotating ring and the stationary ring are open. At this time, the rotating ring and the stationary ring are in a non-contact state, thereby reducing the wear of the sealing components of the thrust disc.

[0007] It should be noted that the process medium flows relatively well at the seals of conventional rotating equipment, which can carry away the heat generated by the friction pair end faces and the heat generated by fluid agitation, achieving a cooling effect on the seal, improving the sealing working environment, and extending the seal life. However, the sealing fluid at the thrust disc seal has extremely low fluidity. If the heat generated by the friction pair end faces and the heat generated by fluid agitation cannot be carried away in time, the seal temperature will rise rapidly, leading to seal damage. While conventional liquid film seals can reduce some of the heat generated at the sealing end faces, they cannot solve the problem of heat generated by fluid agitation. This invention, by significantly enhancing the hydrodynamic pressure effect, improves the lubrication conditions of the sealing end faces, and increases the seal leakage, thereby carrying away the heat generated by fluid agitation, improving the sealing working environment, and thus extending the service life of the sealing structure.

[0008] Therefore, the liquid film thrust disc sealing structure provided by the present invention can promote the formation of a liquid film of a certain thickness between the dynamic ring and the stationary ring, realize frictionless operation, replace the labyrinth seal of the unit thrust disc, and extend the continuous operation cycle of the unit.

[0009] In an optional embodiment, a plurality of rotation-limiting protrusions are provided inside the through hole in the middle of the stationary ring to ensure that the stationary ring can remain relatively stationary.

[0010] In an optional embodiment, the dynamic pressure groove is disposed on the stationary ring to facilitate the machining of the dynamic pressure groove.

[0011] In an optional embodiment, the dynamic pressure groove includes a plurality of arc-shaped grooves, which are evenly distributed along the circumference of the stationary ring, and the openings of the arc-shaped grooves are connected to the through holes in the middle of the stationary ring.

[0012] In an optional embodiment, the dynamic pressure groove further includes a plurality of guide grooves, which are evenly distributed along the circumference of the stationary ring. One end of a guide groove is connected to the arc-shaped groove, and the other end extends to the outside of the stationary ring, so as to draw out the sealing fluid in the arc-shaped groove through the guide groove. When the dynamic ring and the stationary ring remain relatively stationary, there is a static gap between the dynamic ring and the stationary ring, and there is still flow of sealing fluid between the dynamic ring and the stationary ring, so that the dynamic ring and the stationary ring are in a non-contact state in this state.

[0013] In an optional embodiment, the dynamic pressure groove further includes a plurality of auxiliary grooves, one side of which communicates with a through hole in the middle of the stationary ring; the plurality of auxiliary grooves are evenly distributed along the circumference of the stationary ring, and the auxiliary grooves are staggered with the arc-shaped groove to ensure that the dynamic ring and the stationary ring have sufficient dynamic pressure effect.

[0014] In an optional embodiment, the auxiliary groove is a "T"-shaped arc groove.

[0015] In an optional embodiment, the depth of the dynamic pressure groove is 0.1 to 3 mm.

[0016] Secondly, the present invention provides a thrust disk assembly, including the above-mentioned liquid film thrust disk sealing structure and thrust disk body. The thrust disk body is installed on the side of the mounting base away from the stationary ring, which allows the end faces of the rotating ring and the stationary ring to be opened. At this time, the rotating ring and the stationary ring are in a non-contact state, which can reduce the wear of the sealing assembly of the thrust disk.

[0017] Thirdly, the present invention provides a screw compressor including the aforementioned thrust disc assembly, which can extend the continuous operation cycle of the unit.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects.

[0019] 1. The liquid film thrust disc sealing structure provided by the present invention has a dynamic pressure groove on the side of the rotating ring facing the stationary ring or the side of the stationary ring facing the rotating ring. The rotation of the thrust disc drives the rotating ring and the stationary ring to rotate relative to each other, thereby bringing the sealing liquid into the dynamic pressure groove to generate a dynamic pressure effect, so as to form a liquid film on the end faces of the rotating ring and the stationary ring. The opening force generated by the dynamic pressure effect pushes the rotating ring and the stationary ring apart to a certain degree, so that the end faces of the rotating ring and the stationary ring are open. At this time, the rotating ring and the stationary ring are in a non-contact state, thereby reducing the wear of the sealing components of the thrust disc. It can replace the labyrinth seal of the unit's thrust disc and extend the continuous operation cycle of the unit.

[0020] 2. The liquid film thrust disk sealing structure provided by the present invention includes the above-mentioned liquid film thrust disk sealing structure and the thrust disk body. The thrust disk body is installed on the side of the mounting base away from the stationary ring, which allows the end faces of the rotating ring and the stationary ring to be opened. At this time, the rotating ring and the stationary ring are in a non-contact state, which can reduce the wear of the sealing components of the thrust disk.

[0021] 3. The liquid film thrust disk sealing structure provided by the present invention includes the aforementioned thrust disk assembly, which can extend the continuous operation cycle of the unit. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] In the attached diagram:

[0024] Figure 1 This is a schematic diagram of the liquid film thrust disk sealing structure according to an embodiment of the present invention;

[0025] Figure 2 This is a left-side structural schematic diagram of the stationary ring of the liquid film thrust disk sealing structure according to an embodiment of the present invention;

[0026] Figure 3 for Figure 2 A schematic diagram of the AA-surface structure;

[0027] Figure 4 This is a left-side structural schematic diagram of the stationary ring of the liquid film thrust disk sealing structure according to another embodiment of the present invention;

[0028] Figure 5 for Figure 4 A schematic diagram of the BB surface structure.

[0029] The attached diagram shows the markings and corresponding component names:

[0030] 10-Mounting base, 20-Thrust disc body, 30-Dynamic ring, 40-End cover assembly, 50-Static ring, 51-Spin limit protrusion, 60-Dynamic pressure groove, 61-Arc groove, 62-Guide groove, 63-Auxiliary groove. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of the embodiments of this application, the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Example 1

[0035] Combination Figure 1This embodiment provides a liquid film thrust disk sealing structure, including: a mounting base 10, one side of which is used to mount the thrust disk body 20, and the other side of which is mounted a rotating ring 30; an end cap assembly 40, the inner side of which is mounted a stationary ring 50 adapted to the rotating ring 30; wherein, a dynamic pressure groove 60 is provided on the side of the rotating ring 30 facing the stationary ring 50 or on the side of the stationary ring 50 facing the rotating ring 30.

[0036] Specifically, the dynamic pressure groove 60 can be disposed on the moving ring 30 or the stationary ring 50, depending on the materials of the moving ring 30 and the stationary ring 50. Typically, the dynamic pressure groove 60 is disposed on the stationary ring 50 to facilitate its machining.

[0037] Combination Figure 2 and Figure 3 The inner side of the through hole in the middle of the stationary ring 50 is provided with several rotation-limiting protrusions 51 to ensure that the stationary ring 50 can maintain a relatively stationary state.

[0038] Regarding the specific shape of the dynamic pressure groove 60, in this embodiment, the dynamic pressure groove 60 includes a plurality of arc-shaped grooves 61, which are evenly distributed along the circumference of the stationary ring 50, and the opening of the arc-shaped groove 61 is connected to the through hole in the middle of the stationary ring 50.

[0039] Based on this, the dynamic pressure groove 60 also includes a plurality of guide grooves 62, which are evenly distributed around the stationary ring 50. One end of each guide groove 62 is connected to the arc-shaped groove 61, and the other end extends to the outside of the stationary ring 50, so as to draw out the sealing fluid in the arc-shaped groove 61 through the guide groove 62. When the dynamic ring 30 and the stationary ring 50 remain relatively stationary, there is a static gap between the dynamic ring 30 and the stationary ring 50, and there is still flow of sealing fluid between the dynamic ring 30 and the stationary ring 50, so that the dynamic ring 30 and the stationary ring 50 are in a non-contact state in this state.

[0040] It should be understood that the number of guide grooves 62 is usually less than the number of arc grooves 61. In this embodiment, the number of guide grooves 62 is 3.

[0041] Combined again Figure 2 and Figure 3 For the specific dimensions of the dynamic pressure groove 60, it is only necessary to meet the sealing requirements. The key parameter affecting the sealing of the liquid film thrust disk is: load coefficient K1=((E 2 -B 2 ) / (A 2 -B 2 K2 = 0.1~1; K2 = ((E) 2 -C 2 ) / (A 2 -C2 =0.1~1; Depth of dynamic pressure groove 60: t1=0.1~3mm, t2=0.01~3mm; Radius of arc groove 61 R=1~30mm, Number of arc grooves 61 N=3~30; D=1~15mm, L=1~30; Groove-dam ratio (G / F)=0.01~1.

[0042] In summary, the liquid film thrust disk sealing structure provided in this embodiment has a dynamic pressure groove 60 on the side of the rotating ring 30 facing the stationary ring 50 or the side of the stationary ring 50 facing the rotating ring 30. The rotation of the thrust disk drives the rotating ring 30 and the stationary ring 50 to rotate relative to each other, thereby bringing the sealing liquid into the dynamic pressure groove 60 to generate a dynamic pressure effect, so as to form a liquid film on the end faces of the rotating ring 30 and the stationary ring 50. The opening force generated by the dynamic pressure effect pushes the rotating ring 30 and the stationary ring 50 apart to a certain degree, so that the end faces of the rotating ring 30 and the stationary ring 50 are open. At this time, the rotating ring 30 and the stationary ring 50 are in a non-contact state, thereby reducing the wear of the sealing components of the thrust disk.

[0043] It should be noted that the process medium flows relatively well at the seals of conventional rotating equipment, which can carry away the heat generated by the friction pair end faces and the heat generated by fluid agitation, achieving a cooling effect on the seal, improving the sealing working environment, and extending the seal life. However, the sealing fluid at the thrust disc seal has extremely low fluidity. If the heat generated by the friction pair end faces and the heat generated by fluid agitation cannot be carried away in time, the seal temperature will rise rapidly, leading to seal damage. While conventional liquid film seals can reduce some of the heat generated at the sealing end faces, they cannot solve the problem of heat generated by fluid agitation. This invention, by significantly enhancing the hydrodynamic pressure effect, improves the lubrication conditions of the sealing end faces, and increases the seal leakage, thereby carrying away the heat generated by fluid agitation, improving the sealing working environment, and thus extending the service life of the sealing structure.

[0044] Therefore, the liquid film thrust disk sealing structure provided in this embodiment can promote the formation of a liquid film of a certain thickness between the moving ring 30 and the stationary ring 50, realize frictionless operation, and replace the labyrinth seal of the unit thrust disk, thus extending the continuous operation cycle of the unit.

[0045] Example 2

[0046] Combination Figure 1 This embodiment provides a liquid film thrust disk sealing structure, including: a mounting base 10, one side of which is used to mount the thrust disk body 20, and the other side of which is mounted a rotating ring 30; an end cap assembly 40, the inner side of which is mounted a stationary ring 50 adapted to the rotating ring 30; wherein, a dynamic pressure groove 60 is provided on the side of the rotating ring 30 facing the stationary ring 50 or on the side of the stationary ring 50 facing the rotating ring 30.

[0047] Specifically, the dynamic pressure groove 60 can be disposed on the moving ring 30 or the stationary ring 50, depending on the materials of the moving ring 30 and the stationary ring 50. Typically, the dynamic pressure groove 60 is disposed on the stationary ring 50 to facilitate its machining.

[0048] Combination Figure 4 and Figure 5 The inner side of the through hole in the middle of the stationary ring 50 is provided with several rotation-limiting protrusions 51 to ensure that the stationary ring 50 can maintain a relatively stationary state.

[0049] Regarding the specific shape of the dynamic pressure groove 60, in this embodiment, the dynamic pressure groove 60 includes a plurality of arc-shaped grooves 61, which are evenly distributed along the circumference of the stationary ring 50, and the opening of the arc-shaped groove 61 is connected to the through hole in the middle of the stationary ring 50.

[0050] Furthermore, the dynamic pressure groove 60 also includes a plurality of auxiliary grooves 63, one side of which is connected to the through hole in the middle of the stationary ring 50; the plurality of auxiliary grooves 63 are evenly distributed along the circumference of the stationary ring 50, and the auxiliary grooves 63 and the arc-shaped groove 61 are staggered to ensure that the dynamic ring 30 and the stationary ring 50 have sufficient dynamic pressure effect.

[0051] Optionally, the auxiliary groove 63 is a "T"-shaped arc groove.

[0052] Combined again Figure 4 and Figure 5 For the specific dimensions of the dynamic pressure groove 60, it is only necessary to meet the sealing requirements. The key parameter affecting the sealing of the liquid film thrust disk is: load factor K = ((E 2 -B 2 ) / (A 2 -B 2 =0.1~1; Dynamic pressure groove 60 depth: t1=0.1~3mm; R=1~30mm, N=3~30; D=1~15mm; Inner groove-dam ratio (G / F)=0.01~1; M=((360 / N)-(1~10))°; Outer groove-dam ratio (P / S)=0.01~1; Groove-dam area ratio ((R groove + T-shaped arc groove) / (A 2 -B 2 )) = 0.01~1.

[0053] Similarly, the liquid film thrust disk sealing structure provided in this embodiment has a dynamic pressure groove 60 on the side of the moving ring 30 facing the stationary ring 50 or the side of the stationary ring 50 facing the moving ring 30. The rotation of the thrust disk drives the moving ring 30 and the stationary ring 50 to rotate relative to each other, thereby bringing the sealing liquid into the dynamic pressure groove 60 to generate a dynamic pressure effect, so as to form a liquid film on the end faces of the moving ring 30 and the stationary ring 50. The opening force generated by the dynamic pressure effect pushes the moving ring 30 and the stationary ring 50 apart to a certain degree, so that the end faces of the moving ring 30 and the stationary ring 50 are open. At this time, the moving ring 30 and the stationary ring 50 are in a non-contact state, so as to reduce the wear of the sealing components of the thrust disk.

[0054] In addition, this embodiment improves the lubrication conditions of the sealing end face by significantly enhancing the hydrodynamic effect, increasing the amount of sealing leakage, thereby removing the heat of fluid stirring, improving the sealing working environment, and thus extending the working life of the sealing structure.

[0055] Therefore, the liquid film thrust disk sealing structure provided in this embodiment can promote the formation of a liquid film of a certain thickness between the moving ring 30 and the stationary ring 50, realize frictionless operation, and replace the labyrinth seal of the unit thrust disk, thus extending the continuous operation cycle of the unit.

[0056] Example 3

[0057] Combination Figure 1 This embodiment provides a liquid film thrust disk sealing structure, including the liquid film thrust disk sealing structure described in Embodiment 1 or 2 and a thrust disk body 20. The thrust disk body 20 is installed on the side of the mounting base 10 away from the stationary ring 50, which allows the end faces of the rotating ring 30 and the stationary ring 50 to be opened. At this time, the rotating ring 30 and the stationary ring 50 are in a non-contact state, which can reduce the wear of the sealing components of the thrust disk.

[0058] Example 4

[0059] The present invention provides a screw compressor, including the thrust disc assembly described in Embodiment 3, which can extend the continuous operation cycle of the unit.

[0060] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A liquid film thrust plate seal structure, characterized by, The application relates to a liquid film thrust disc sealing structure and a thrust disc assembly. The mounting base (10) is used for mounting a thrust disc body (20) on one side and is provided with a movable ring (30) on the other side; An end cover assembly (40) is internally provided with a static ring (50) matched with the movable ring (30); The static ring (50) is provided with a movable pressure groove (60) on the side opposite to the movable ring (30), the movable pressure groove (60) is arranged on the static ring (50), the movable pressure groove (60) comprises a plurality of arc grooves (61), the arc grooves (61) are circumferentially distributed on the static ring (50), and the arc grooves (61) are communicated with through holes in the middle part of the static ring (50) on one side. The movable pressure groove (60) further comprises a plurality of auxiliary grooves (63), the auxiliary grooves (63) are communicated with the through holes in the middle part of the static ring (50) on one side, the auxiliary grooves (63) are circumferentially distributed on the static ring (50), and the auxiliary grooves (63) are arranged in an alternating manner with the arc grooves (61), and the auxiliary grooves (63) are "T"-shaped arc grooves.

2. The liquid film thrust plate seal structure of claim 1 wherein, A plurality of rotation limiting protrusions (51) are arranged in the through holes in the middle part of the static ring (50).

3. The liquid film thrust plate seal structure of claim 1 wherein, The movable pressure groove (60) further comprises a plurality of flow guide grooves (62), the flow guide grooves (62) are circumferentially distributed on the static ring (50), one end of the flow guide groove (62) is connected with the arc groove (61), and the other end of the flow guide groove (62) extends to the outside of the static ring (50).

4. The liquid film thrust plate seal structure of claim 1 wherein, The depth of the movable pressure groove (60) is 0.1-3 mm.

5. A thrust disc assembly, characterised in that, The application further relates to a liquid film thrust disc sealing structure and a thrust disc body (20) as claimed in any one of claims 1-4, and the thrust disc body (20) is mounted on the side of the mounting base (10) away from the static ring (50).

6. Screw compressor, characterized in that The application further relates to a thrust disc assembly as claimed in claim 5.

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