Non-contact oil and gas sealing device

Abstract

The invention discloses a non-contact oil and gas sealing device, comprising an outer oil retaining ring, an end cover, an oil storage box and a first conduit, wherein the outer oil retaining ring body is sleeved on the outer side of the rotating shaft and is spaced from the rotating shaft, the end cover is located on the side of the outer oil retaining ring away from the housing, the end cover is sleeved on the outer side of the rotating shaft and defines a first expansion space together with the outer oil retaining ring, the lower end of the outer oil retaining ring body is provided with a first oil outlet hole connected to the first expansion space, one end of the first conduit is connected to the first oil outlet hole and the other end extends below the liquid level of the oil in the oil storage box, the side wall of the oil storage box is provided with an oil return hole with a height higher than the liquid level of the oil in the oil storage box, and the oil storage box is connected to the oil and gas cavity of the housing through the oil return hole. Thus, the oil and gas entering the first expansion space can be introduced into the oil storage box through the first conduit, and the oil and gas in the oil and gas cavity are blocked by the oil after entering the oil storage box, and will not flow back to the first expansion space through the first conduit, thereby reducing oil and gas reflux and oil and gas leakage, and achieving oil and gas sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and in particular to a non-contact oil and gas sealing device. Background Art

[0002] Lubricating oil can keep gears and bearings in good working condition. The interior of mechanical devices such as gearboxes, crankcases and bearing chambers is usually an oil-gas two-phase environment. In order to prevent the lubricating oil in the oil-gas chamber from leaking from the shaft end to the external environment, a sealing structure needs to be set at the shaft end of such equipment. There are many types of shaft end sealing structures, including rubber and plastic seals, mechanical seals, packing seals and labyrinth seals. Each sealing structure has its own characteristics. The sealing type can be selected according to the actual situation in the project. However, the current shaft end sealing structure has the problem of complex structure, difficult manufacturing and installation, and poor sealing effect. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a non-contact oil-gas sealing device, which can significantly reduce oil leakage.

[0004] In order to achieve the above object, the present invention proposes a non-contact oil-gas sealing device, comprising:

[0005] An outer oil-blocking ring, the outer oil-blocking ring comprising an outer oil-blocking ring body and a first annular oil-blocking portion, the outer oil-blocking ring body being sleeved on the outer side of the rotating shaft and spaced apart from the rotating shaft, the inner surface of the outer oil-blocking ring being provided with the first annular oil-blocking portion, the outer oil-blocking ring being installed on a housing provided with the rotating shaft;

[0006] An end cover, the end cover is located at a side of the outer oil retaining ring away from the housing, the end cover is sleeved on the outer side of the rotating shaft and connected to the outer oil retaining ring, the end cover and the outer oil retaining ring jointly define a first expansion space, and a first oil outlet hole communicating with the first expansion space is provided at the lower end of the outer oil retaining ring body;

[0007] An oil storage box is connected to the first oil outlet hole and the oil and gas cavity of the casing.

[0008] According to the non-contact oil and gas sealing device of the embodiment of the present invention, when the oil and gas in the oil and gas cavity 80 of the housing leaks along the outer side of the rotating shaft, it will be guided back to the oil and gas cavity 80 of the housing under the action of the non-contact oil and gas sealing device of the embodiment of the present invention, thereby effectively reducing the leakage of oil and gas. Specifically, the outer oil retaining ring body is sleeved on the outer side of the rotating shaft and is spaced from the rotating shaft, the end cover is located on the side of the outer oil retaining ring away from the housing, the end cover and the outer oil retaining ring jointly define a first expansion space, the first expansion space is connected to the oil storage box, the first oil storage box is connected to the oil and gas cavity of the housing, so that the oil and gas entering the first expansion space along the outer side of the rotating shaft can be introduced into the oil storage box through the first oil outlet, and then introduced into the oil and gas cavity of the housing by the oil storage box, thereby achieving the sealing of oil and gas and reducing oil and gas leakage.

[0009] In addition, the non-contact oil-gas sealing device according to the above embodiment of the present invention may also have the following additional technical features:

[0010] According to an embodiment of the non-contact oil and gas sealing device of the present invention, the non-contact oil and gas sealing device further includes: an inner oil retaining ring, which is sleeved on the outer surface of the rotating shaft and is spaced apart from the outer oil retaining ring and the end cover, and the inner oil retaining ring is located on the inner side of the outer oil retaining ring in the radial direction of the non-contact oil and gas sealing device, and the inner oil retaining ring has a second annular oil retaining portion extending toward the outer oil retaining ring, and the second annular oil retaining portion is located between the first annular oil retaining portion and the end cover.

[0011] According to a further embodiment of the present invention, in the axial direction of the rotating shaft, a projection of the first annular oil deflecting portion and an axial projection of the second annular oil deflecting portion have an overlapping area.

[0012] According to a further embodiment of the present invention, the inner oil ring comprises an inner oil ring body, the second annular oil retaining portion is arranged on the inner oil ring body, and the inner oil ring body is sleeved on the outer surface of the rotating shaft and is located between the first annular oil retaining portion and the rotating shaft.

[0013] According to a further embodiment of the present invention, the first annular oil retaining portion and the inner oil retaining ring body are spaced apart.

[0014] According to a further embodiment of the present invention, there are multiple outer oil retaining rings, and the multiple outer oil retaining rings are connected in sequence in the axial direction of the rotating shaft. In the axial direction of the rotating shaft, two adjacent first annular oil retaining portions are spaced apart to define the second expansion space between the two adjacent first annular oil retaining portions.

[0015] According to a further embodiment of the present invention, there are multiple inner oil retaining rings, which are arranged in sequence in the axial direction of the rotating shaft, and the second annular oil retaining portion is provided between at least two adjacent first annular oil retaining portions.

[0016] According to a further embodiment of the present invention, the plurality of inner oil retainer rings and the plurality of outer oil retainer rings correspond one to one in the radial direction of the non-contact oil-gas sealing device.

[0017] According to the non-contact oil and gas sealing device of one embodiment of the present invention, the first oil outlet is provided with a first joint, one end of the first conduit is connected to the first joint, and the other end of the first conduit extends into the oil storage box.

[0018] According to an embodiment of the present invention, the non-contact oil-gas sealing device further includes a second conduit, which connects the oil storage box and the oil storage cavity, and guides the oil in the oil storage box into the oil storage cavity through the second conduit.

[0019] According to a non-contact oil and gas sealing device according to one embodiment of the present invention, the end cover includes an end cover body and an end cover oil retaining portion, the end cover body and the end cover oil retaining portion are connected, the end cover body is sleeved on the outside of the rotating shaft, the end cover oil retaining portion is connected to the outer oil retaining ring, and the inner surface of the end cover body is provided with a plurality of annular protrusions, the plurality of annular protrusions all extend in the circumferential direction of the end cover body, and a third expansion space is formed between two adjacent annular protrusions.

[0020] According to a further embodiment of the present invention, the end cover body is provided with a second oil outlet hole, the second oil outlet hole is located below the third expansion space, and the second oil outlet hole is connected to the third expansion space and the oil storage box.

[0021] According to a further embodiment of the present invention, the end cover body is provided with a communicating hole and a communicating groove, the communicating hole is in communication with the third expansion space and the communicating groove, and the communicating groove is in communication with the second oil outlet hole.

[0022] According to a further embodiment of the present invention, it further includes a third conduit, the second oil outlet is provided with a second joint, one end of the third conduit is connected to the second joint, and the other end of the third conduit extends into the oil storage box and is located below the liquid level of the oil in the oil storage box.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 and Figure 2 is a cross-sectional view of a non-contact oil-gas sealing device according to an embodiment of the present invention;

[0026] Reference numerals:

[0027] Outer oil retainer ring 10; outer oil retainer ring body 101; first annular oil retainer portion 102; first oil outlet hole 103; first joint 104; bolt 105;

[0028] Rotating shaft 20;

[0029] Casing 30; Oil and gas chamber 80 of the casing;

[0030] End cover 40; end cover body 401; end cover oil retaining portion 402; annular protrusion 403; connecting hole 404; connecting groove 405; second oil outlet hole 406;

[0031] Oil storage box 50; oil storage box chamber 501; oil 502;

[0032] Inner oil retaining ring 60; Inner oil retaining ring body 601; Second annular oil retaining portion 602;

[0033] A first conduit 701; a second conduit 702; a third conduit 703;

[0034] Sealing ring 90. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] The following embodiments are for illustrative purposes, but after reading the following technical solution, a person of ordinary skill can obviously understand that the solution can be applied to a technical solution of three or more material boxes, which also falls within the protection scope of the present invention.

[0037] Reference below Figure 1 A non-contact oil-gas sealing device according to an embodiment of the present invention is described.

[0038] Reference Figure 1As shown, the present invention proposes a non-contact oil and gas sealing device, which includes an outer oil retaining ring 10, an end cover 40, an oil storage box 50 and a first conduit 701. The outer oil retaining ring 10 includes an outer oil retaining ring body 101 and a first annular oil retaining portion 102. The outer oil retaining ring body 101 is sleeved on the outside of the rotating shaft 20 and is spaced from the rotating shaft 20. The inner surface of the outer oil retaining ring 10 is provided with a first annular oil retaining portion 102. The outer oil retaining ring 10 is installed on the rotating shaft 20. The housing 30; the end cover 40 is located on the side of the outer oil retaining ring 10 away from the housing 30, the end cover 40 is sleeved on the outside of the rotating shaft 20 and connected to the outer oil retaining ring 10, the end cover 40 and the outer oil retaining ring 10 jointly define a first expansion space, and the lower end of the outer oil retaining ring body 101 is provided with a first oil outlet hole 103 connected to the first expansion space; an oil storage box 50 and a first conduit 701, one end of the first conduit 701 is connected to the first oil outlet hole 103, the other end of the first conduit 701 extends into the oil storage box 50 and is located below the liquid level of the oil 502 in the oil storage box 50, the side wall of the oil storage box 50 is provided with an oil return hole, the height of the oil return hole is higher than the liquid level of the oil 502 in the oil storage box 50, and the oil storage box 50 is connected to the oil and gas cavity (80) of the housing through the oil return hole.

[0039] When the oil and gas in the oil and gas cavity 80 of the casing leaks along the outer side of the rotating shaft 20, the oil and gas will be guided back into the oil and gas cavity 80 of the casing by the non-contact oil and gas sealing device of the embodiment of the present invention, thereby effectively reducing the leakage of the oil and gas.

[0040] Specifically, the outer oil retaining ring body 101 is sleeved on the outer side of the rotating shaft 20 and is spaced from the rotating shaft 20, the end cover 40 is located on the side of the outer oil retaining ring 10 away from the housing 30, and the end cover 40 and the outer oil retaining ring 10 jointly define a first expansion space, the first expansion space is connected to the oil storage box 50, and the first oil storage box 50 is connected to the oil and gas cavity 80 of the housing of the housing 30, so after the airflow carrying oil droplets enters the first expansion space, the airflow speed decreases, and the oil droplets in the airflow fall to the bottom of the first expansion space under the action of gravity, and then are introduced into the oil storage box 50 through the first oil outlet 103, and the oil and gas flowing into the oil storage box 50 are then introduced into the oil and gas cavity 80 of the housing by the oil storage box 50, thereby realizing the sealing of oil and gas, realizing the recovery of oil and gas, and reducing oil and gas leakage. In addition, the non-contact oil and gas sealing device of the present application has a simple structure and is easy to manufacture and install.

[0041] In some embodiments of the present invention, the non-contact oil and gas sealing device also includes an inner oil retaining ring 60, which is sleeved on the outer surface of the rotating shaft 20 and is separated from the outer oil retaining ring 10 and the end cover 40. In the radial direction of the non-contact oil and gas sealing device, the inner oil retaining ring 60 is located on the inner side of the outer oil retaining ring 10, and the inner oil retaining ring 60 has a second annular oil retaining portion 602 extending toward the outer oil retaining ring 10, and the second annular oil retaining portion 602 is located between the first annular oil retaining portion 102 and the end cover 40.

[0042] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by the term "radial" etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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.

[0043] In the non-contact oil and gas sealing device, the end cover 40 and the outer oil retaining ring 10 can be fixedly connected by bolts 105; the inner oil retaining ring 60 can be configured to rotate with the rotating shaft 20, and the outer oil retaining ring 10 is fixed on the casing 30, and the inner oil retaining ring 60 and the outer oil retaining ring 10 are arranged in sequence at intervals to form an interlaced labyrinth sealing structure.

[0044] The inner oil retaining ring 60 is sleeved on the outer surface of the rotating shaft 20 and is separated from the outer oil retaining ring 10 and the end cover 40. The second annular oil retaining portion 602 of the inner oil retaining ring 60 is located between the end cover 40 and the first annular oil retaining portion 102 of the outer oil retaining ring 10. Thus, the inner oil retaining ring 60, the outer oil retaining ring 10 and the end cover 40 together constitute a combined staggered labyrinth sealing structure. The oil entering the first expansion space is introduced into the oil storage box 50 through the first oil outlet 103 at the lower end of the outer oil retaining ring body 101, and then introduced into the oil and gas cavity 80 of the casing by the oil storage box 50, thereby realizing oil and gas sealing and greatly reducing oil leakage.

[0045] Compared with the general straight-through and stepped sealing structures, this non-contact oil-gas sealing device is more suitable for sealing oil-gas two-phase media, can effectively collect oil and gas, reduce oil and gas leakage, and has the advantages of simple structure, low cost, long life, easy maintenance, simple structure, and easy manufacturing and installation.

[0046] In some embodiments of the present invention, in the axial direction of the rotating shaft 20 , the projection of the first annular oil deflector 102 and the axial projection of the second annular oil deflector 602 have an overlapping area.

[0047] The projection of the first annular oil baffle portion 102 and the axial projection of the second annular oil baffle portion 602 have an overlapping area, so that the inner oil baffle ring 60, the outer oil baffle ring 10 and the end cover 40 together constitute a combined staggered labyrinth sealing structure, and the oil entering the first expansion space is introduced into the oil storage box 50 through the first oil outlet hole 103 at the lower end of the outer oil baffle ring body 101, and then introduced into the oil and gas cavity 80 of the casing by the oil storage box 50, thereby realizing oil and gas sealing; compared with straight-through labyrinth seals, the combined staggered labyrinth sealing structure is more suitable for sealing oil and gas two-phase media, can effectively collect oil and gas, and reduce oil and gas leakage, and the non-contact oil and gas sealing device of the present application has the advantages of simple structure, low cost, long life, easy maintenance, simple structure, and easy manufacturing and installation.

[0048] In some embodiments of the present invention, the inner oil retaining ring 60 includes an inner oil retaining ring body 601, a second annular oil retaining portion 602 is disposed on the inner oil retaining ring body 601, and the inner oil retaining ring body 601 is sleeved on the outer surface of the rotating shaft 20 and is located between the first annular oil retaining portion 102 and the rotating shaft 20. The inner oil retaining ring body 601 is located between the first annular oil retaining portion 102 and the rotating shaft 20, and the second annular oil retaining portion 602 is disposed on the inner oil retaining ring body 601, then the outer oil retaining ring body 101, the first annular oil retaining portion 102, the inner oil retaining ring body 601, the second annular oil retaining portion 602 and the end cover 40 together constitute a staggered maze structure, which can effectively collect oil and introduce the oil into the oil and gas cavity 80 of the casing, thereby achieving oil and gas sealing and greatly reducing oil leakage.

[0049] In some embodiments of the present invention, the first annular oil retaining portion 102 and the inner oil retaining ring body 601 are spaced apart from each other.

[0050] The second annular oil baffle portion 602 extends into the first expansion space, and the second annular oil baffle portion 602 divides the first expansion space into a plurality of sub-expansion spaces, and the plurality of sub-expansion spaces are connected. Since the first annular oil baffle portion 102 and the inner oil baffle ring body 601 are separated, the oil and gas introduced into the sub-expansion space close to the side of the casing 30 can be introduced into the sub-expansion space away from the side of the casing 30 through the gap between the first annular oil baffle portion 102 and the inner oil baffle ring body 601, and then introduced into the oil storage box 50 through the corresponding first oil outlet hole 103, thereby realizing oil and gas sealing and greatly reducing oil leakage.

[0051] In some embodiments of the present invention, there are multiple outer oil retaining rings 10, and the multiple outer oil retaining rings 10 are sequentially connected in the axial direction of the rotating shaft 20. In the axial direction of the rotating shaft 20, two adjacent first annular oil retaining portions 102 are spaced apart to define a second expansion space between the two adjacent first annular oil retaining portions 102. In the description of the present invention, "multiple" means two or more.

[0052] The number of the outer oil retainer rings 10 can be selected and determined according to actual needs; specifically, the number of the outer oil retainer rings 10 depends on the sealing application and the requirement for leakage; the more the number of the outer oil retainer rings 10, the stronger the sealing performance of the non-contact oil-gas sealing device. However, the present invention is not limited to this, and the outer oil retainer ring 10 can also be set to one.

[0053] When there are multiple outer oil retaining rings 10, two adjacent first annular oil retaining portions 102 are spaced apart to define a second expansion space between the two adjacent first annular oil retaining portions 102, thereby forming a plurality of oil return spaces. Each oil return space can effectively collect the oil collected by the corresponding oil retaining ring, and introduce the collected oil into the oil storage box 50 through the corresponding first oil outlet hole 103, thereby greatly reducing oil leakage.

[0054] In some embodiments of the present invention, there are multiple inner oil retaining rings 60 , which are arranged in sequence in the axial direction of the rotating shaft 20 , and a second annular oil retaining portion 602 is provided between at least two adjacent first annular oil retaining portions 102 .

[0055] Specifically, the number of inner oil retaining rings 60 can be selected and determined according to actual needs, and the number of outer oil retaining rings 10 depends on the sealing application and the requirement for leakage; the more the number of inner oil retaining rings 60, the stronger the sealing performance of the non-contact oil-gas sealing device. However, the present invention is not limited to this, and the inner oil retaining ring 60 can also be set to one.

[0056] In order to improve the sealing effect of the oil and gas seal of the non-contact oil and gas sealing device, the inner oil ring 60 and the outer oil ring 10 can be set to a combination of several oil ring structures. Specifically, the number of inner oil rings 60 and outer oil rings 10 depends on the sealing application and the requirement for leakage. The more inner oil rings 60 and outer oil rings 10 are set, the stronger the sealing performance of the non-contact oil and gas sealing device.

[0057] When there are multiple inner oil retaining rings 60, a second annular oil retaining portion 602 is provided between two adjacent first annular oil retaining portions 102, and the second annular oil retaining portion 602 divides the second expansion space formed between the corresponding two adjacent first annular oil retaining portions 102 into multiple connected second sub-expansion spaces. Preferably, a second annular oil retaining portion 602 is provided between two adjacent first annular oil retaining portions 102, and the second annular oil retaining portion 602 divides the second expansion space formed between the corresponding two adjacent first annular oil retaining portions 102 into two connected second sub-expansion spaces. Thus, the outer oil retaining ring body 101, the first annular oil retaining portion 102, the inner oil retaining ring body 601, the second annular oil retaining portion 602 and the end cover 40 together constitute a combined labyrinth structure, which has a multi-level oil return structure, and each level of the oil return structure can effectively correspond to the oil collected by the oil retaining ring, and introduce the collected oil into the oil storage box 50 through the corresponding first oil outlet 103, thereby greatly reducing oil leakage.

[0058] In some embodiments of the present invention, a plurality of inner oil retainer rings 60 and a plurality of outer oil retainer rings 10 are arranged in a one-to-one correspondence in the radial direction of the non-contact oil-gas sealing device.

[0059] A plurality of inner oil retaining rings 60 and a plurality of outer oil retaining rings 10 correspond one to one in the radial direction of the non-contact oil and gas sealing device, and the second annular oil retaining portion 602 of the inner oil retaining ring 60 divides the corresponding second expansion space into two second sub-expansion spaces. Thus, the outer oil retaining ring body 101, the first annular oil retaining portion 102, the inner oil retaining ring body 601, the second annular oil retaining portion 602 and the end cover 40 together constitute a combined maze structure, and the structure has a multi-level oil return structure, and each level of the oil return structure can effectively correspond to the oil collected by the oil retaining ring, and introduce the collected oil into the oil storage box 50 through the corresponding first oil outlet hole 103, thereby greatly reducing oil leakage.

[0060] In some embodiments of the present invention, the non-contact oil and gas sealing device may further include a first conduit 701, the first oil outlet 103 is provided with a first joint 104, one end of the first conduit 701 is connected to the first joint 104, and the other end of the first conduit 701 extends into the oil storage box 50 and is located below the liquid level of the oil 502 in the oil storage box 50.

[0061] The lower end of the outer oil retaining ring body 101 of each outer oil retaining ring 10 is provided with a first oil outlet hole 103, and the first oil outlet hole 103 of the outer oil retaining ring 10 corresponding to the first expansion space is communicated with the first expansion space, and the first oil outlet hole 103 of the outer oil retaining ring 10 corresponding to the second expansion space is communicated with the second expansion space. When there are multiple outer oil retaining rings 10, two first annular oil retaining parts 102 are spaced apart to define a second expansion space between two adjacent first annular oil retaining parts 102, and when there are multiple inner oil retaining rings 60, a second annular oil retaining part 602 is provided between two adjacent first annular oil retaining parts 102, and the second annular oil retaining part 602 separates the second expansion space formed between the corresponding two adjacent first annular oil retaining parts 102 into a plurality of connected second sub-expansion spaces.

[0062] Furthermore, a plurality of first conduits 701 may be provided, and the plurality of first conduits 701 are respectively provided corresponding to the first expansion space and the second expansion space. For example, a first expansion space is communicated with a first conduit 701, and a second expansion space is communicated with a first conduit 701. The first expansion space and the second expansion space are respectively communicated with the oil storage box 50 through the first conduits 701 corresponding thereto. Thus, when the oil and gas in the oil and gas cavity 80 of the casing enter the first expansion space and the second expansion space, they will be introduced into the oil storage box 50 through the first conduit 701.

[0063] The design and installation of the first conduit 701 are the key to ensuring the sealing performance of the non-contact oil and gas sealing device. By setting the other end of the first conduit 701 to extend below the liquid level of the oil 502 in the oil storage box 50, the other end of the first conduit 701 is not directly connected to the oil storage box chamber 501 above the oil 502, which can seal the gas and reduce the leakage. At the same time, the oil is guided back to the oil storage box 50 and the oil and gas in the casing 30 are prevented from flowing into the first expansion space along the first conduit 701. Specifically, the first conduit 701 and the oil storage box 50 together form a "return oil seal" structure, which blocks the direct connection between the oil and gas chamber 80 of the housing and the first expansion space, so that the oil and gas two-phase medium in the oil and gas chamber 80 of the housing cannot leak through the oil storage box 50 and the first conduit 701, that is, after the oil and gas enter the oil storage box 50 from the oil and gas chamber 80 of the housing, it will be blocked by the oil in the oil storage box 50, and then cannot flow back to the first expansion space through the first conduit 701, thereby avoiding oil and gas reflux and greatly reducing oil leakage. The oil storage box 50 can be filled with oil to make the liquid level of the oil 502 in the oil storage box 50 higher than the lower end surface of the first conduit 701, thereby improving the oil and gas sealing ability of the non-contact oil and gas sealing device.

[0064] In some embodiments of the present invention, a second conduit 702 is further included, which connects the oil storage box 50 and the oil and gas cavity 80 of the casing, and the oil 502 (which can be lubricating oil) in the oil storage box 50 is introduced into the oil and gas cavity 80 of the casing through the second conduit 702.

[0065] The second conduit 702 guides the oil 502 in the oil storage box 50 into the oil-gas chamber 80 of the housing, so as to realize the recovery of the oil 502 and reduce the leakage of the oil.

[0066] In some embodiments of the present invention, the end cover 40 includes an end cover body 401 and an end cover oil retaining portion 402, the end cover body 401 and the end cover oil retaining portion 402 are connected, the end cover body 401 is sleeved on the outside of the rotating shaft 20, the end cover oil retaining portion 402 is connected to the outer oil retaining ring 10, and the inner surface of the end cover body 401 is provided with a plurality of annular protrusions 403; the plurality of annular protrusions 403 all extend in the circumferential direction of the end cover body 401, and a third expansion space is formed between two adjacent annular protrusions 403.

[0067] The inner surface of the end cover body 401 is provided with a plurality of annular protrusions 403 , and a third expansion space is formed between two adjacent annular protrusions 403 . The third expansion space can further recover the oil and gas leaked along the outer surface of the rotating shaft 20 , effectively reducing oil leakage.

[0068] In some embodiments of the present invention, the end cover body 401 is provided with a second oil outlet 406 , and the second oil outlet 406 is located below the third expansion space, and the second oil outlet 406 is connected to the third expansion space and the oil storage box 50 .

[0069] The end cover 40 is connected to the outermost external oil retaining ring 10, and a second oil outlet hole 406 is provided at the bottom of the end cover body 401. The second oil outlet hole 406 connects the third expansion space and the oil storage box 50. The oil entering the third expansion space can be introduced into the oil storage box 50 through the second oil outlet hole 406, thereby realizing oil and gas sealing and greatly reducing oil leakage.

[0070] In some embodiments of the present invention, the end cover body 401 is provided with a communicating hole 404 and a communicating groove 405 , the communicating hole 404 is in communication with the third expansion space and the communicating groove 405 , and the communicating groove 405 is in communication with the second oil outlet hole 406 .

[0071] The connecting groove 405 connects the connecting hole 404 and the second oil outlet hole 406. The oil entering the third expansion space first enters the connecting groove 405 through the connecting hole 404, and then enters the oil storage box 50 through the connecting groove 405 through the second oil outlet hole 406. In this way, the oil in the third expansion space is introduced into the oil storage box 50, thereby achieving oil-gas sealing and greatly reducing oil leakage.

[0072] The inner surface of the end cover body 401 is provided with a plurality of annular protrusions 403, and the plurality of annular protrusions 403 separate a plurality of third expansion spaces. The end cover body 401 is provided with a plurality of connecting holes 404, and the plurality of connecting holes 404 are arranged in a one-to-one correspondence with the plurality of third expansion spaces, that is, one connecting hole 404 is correspondingly arranged for one third expansion space, and the plurality of connecting holes 404 are connected through a connecting groove 405, thereby connecting each third expansion space. The oil entering each third expansion space can enter the connecting groove 405 through the corresponding connecting hole 404, and then be introduced into the oil storage box 50 through the second oil outlet hole 406 connected to the connecting groove 405. Based on this structure, only a small number of common second oil outlet holes 406 need to be provided in the end cover 40 body to realize the export of the oil in each third expansion space, that is, it is not necessary to provide second oil outlet holes 406 equal in number to the connecting holes 404 to realize the export of the oil in each third expansion space, thereby simplifying the structure of the end cover 40, and ensuring that the oil in each third expansion space is introduced into the oil storage box 50, realizing oil-gas sealing, and effectively reducing oil leakage.

[0073] Furthermore, the depth direction of the connecting groove 405 is parallel to the axial direction of the rotating shaft 20. In the axial direction of the rotating shaft 20, the end of the connecting groove 405 away from the housing 30 is open. In actual use, a plug can be provided at the end of the connecting groove 405 away from the housing 30, and the connecting groove 405 is sealed by the plug to prevent the oil flowing into the connecting groove 405 from leaking from the open end of the connecting groove 405.

[0074] In some embodiments of the present invention, the non-contact oil and gas sealing device may further include: a third conduit 703, a second joint is provided at the second oil outlet 406, one end of the third conduit 703 is connected to the second joint, and the other end of the third conduit 703 extends into the oil storage box 50 and is located below the liquid level of the oil 502 in the oil storage box 50. It can also be understood that one end of the third conduit 703 is connected to the third expansion space through the second joint, the second oil outlet 406, and the third expansion space, and when the oil and gas in the oil and gas cavity 80 of the housing enters the third expansion space, it will be introduced into the oil storage box 50 through the third conduit 703, so that the oil accumulated in the third expansion space is discharged into the oil storage box 50.

[0075] The other end of the third conduit 703 is extended below the liquid level of the oil 502 in the oil storage box 50, so that the other end of the third conduit 703 is not directly connected to the oil storage box chamber 501 above the oil 502 in the oil storage box 50, so that the gas can be sealed, the leakage can be reduced, and the oil can be guided back to the oil storage box 50, and the oil and gas in the housing 30 can be prevented from flowing into the third expansion space along the third conduit 703. Specifically, the third conduit 703 and the oil storage box 50 together constitute a "return oil and seal gas" structure, which blocks the direct connection between the oil and gas chamber 80 of the housing and the third expansion space, so that the oil and gas two-phase medium in the oil and gas chamber 80 of the housing cannot leak into the third expansion space through the oil storage box 50 and the third conduit 703, that is, after the oil and gas enter the oil storage box 50 from the oil and gas chamber 80 of the housing, it will be blocked by the oil in the oil storage box 50, and thus cannot flow back to the first expansion space through the third conduit 701, thereby avoiding oil and gas reflux, and thus greatly reducing oil leakage. The oil storage box 50 can be filled with oil to make the liquid level of the oil 502 in the oil storage box 50 higher than the lower end surface of the third conduit 703, thereby improving the oil and gas sealing capability of the non-contact oil and gas sealing device.

[0076] In some embodiments of the present invention, a sealing ring 90 may be provided between two adjacent outer oil retaining rings 10 and between the outer oil retaining ring 10 and the end cover 40 to prevent the sealing medium from leaking along the contact surface between the two adjacent outer oil retaining rings 10 or the contact surface between the outer oil retaining ring 10 and the end cover 40, thereby achieving oil and gas sealing and effectively reducing oil and gas leakage.

[0077] In some embodiments of the present invention, the casing material may be selected to be a transparent material such as plastic, glass, etc., or an oil level observation window may be provided on the casing to facilitate the user to observe whether the amount of oil in the oil box meets the usage requirements.

[0078] Figure 2 is a cross-sectional view of a non-contact oil-gas sealing device according to an embodiment of the present invention, Figure 2 As shown, when the pressure in the oil-gas chamber 80 of the housing is P, and the height of the liquid level in the first conduit 701 and the third conduit 703 relative to the liquid level of the oil 502 in the oil storage box 50 is H, according to the formula P=ρgH, it can be known that during use, the total height L of the oil return conduit should satisfy: Wherein, ρ is the density of the oil in the oil storage box 50, g is the gravity constant, P max is the maximum intracavity pressure of the oil and gas cavity 80 of the casing, and the total height of the oil return conduit is the height from the liquid level of the oil storage box 50 to the upper end surface of the first oil outlet hole 103.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A non-contact oil-gas sealing device, characterized in that: include: An outer oil retainer ring (10), the outer oil retainer ring (10) comprising an outer oil retainer ring body (101) and a first annular oil retainer portion (102), the outer oil retainer ring body (101) being sleeved on the outside of the rotating shaft (20) and spaced apart from the rotating shaft (20), the inner surface of the outer oil retainer ring (10) being provided with the first annular oil retainer portion (102), and the outer oil retainer ring (10) being mounted on a housing (30) provided with the rotating shaft (20); an end cover (40), the end cover (40) being located at a side of the outer oil retaining ring (10) away from the housing (30), the end cover (40) being sleeved on the outside of the rotating shaft (20) and connected to the outer oil retaining ring (10), the end cover (40) and the outer oil retaining ring (10) jointly defining a first expansion space, and a first oil outlet hole (103) communicating with the first expansion space being provided at the lower end of the outer oil retaining ring body (101); An oil storage box (50) and a first conduit (701), one end of the first conduit (701) being in communication with the first oil outlet hole (103), the other end of the first conduit (701) extending into the oil storage box (50) and being located below the liquid level of the oil (502) in the oil storage box (50), a side wall of the oil storage box (50) being provided with an oil return hole, the height of the oil return hole being higher than the liquid level of the oil (502) in the oil storage box (50), and the oil storage box (50) being in communication with the oil and gas chamber (80) of the casing through the oil return hole; The end cover (40) comprises an end cover body (401) and an end cover oil retaining portion (402), the end cover body (401) and the end cover oil retaining portion (402) are connected, the end cover body (401) is sleeved on the outside of the rotating shaft (20), the end cover oil retaining portion (402) is connected to the outer oil retaining ring (10), and the inner surface of the end cover body (401) is provided with a plurality of annular protrusions (403), the plurality of annular protrusions (403) all extend in the circumferential direction of the end cover body (401), and a third expansion space is formed between two adjacent annular protrusions (403); The end cover body (401) is provided with a second oil outlet hole (406), the second oil outlet hole (406) is located below the third expansion space, and the second oil outlet hole (406) is connected to the third expansion space and the oil storage box (50).

2. The non-contact oil-gas sealing device according to claim 1, characterized in that: Also includes: An inner oil retaining ring (60), wherein the inner oil retaining ring (60) is sleeved on the outer surface of the rotating shaft (20) and is spaced apart from the outer oil retaining ring (10) and the end cover (40); in the radial direction of the non-contact oil-gas sealing device, the inner oil retaining ring (60) is located on the inner side of the outer oil retaining ring (10); the inner oil retaining ring (60) has a second annular oil retaining portion (602) extending toward the outer oil retaining ring (10); the second annular oil retaining portion (602) is located between the first annular oil retaining portion (102) and the end cover (40).

3. The non-contact oil-gas sealing device according to claim 2, characterized in that: In the axial direction of the rotating shaft (20), the projection of the first annular oil baffle (102) and the axial projection of the second annular oil baffle (602) have an overlapping area.

4. The non-contact oil-gas sealing device according to claim 2, characterized in that: The inner oil retaining ring (60) comprises an inner oil retaining ring body (601), the second annular oil retaining portion (602) being arranged on the inner oil retaining ring body (601), and the inner oil retaining ring body (601) being sleeved on the outer surface of the rotating shaft (20) and being located between the first annular oil retaining portion (102) and the rotating shaft (20).

5. The non-contact oil-gas sealing device according to claim 4, characterized in that: The first annular oil retaining portion (102) and the inner oil retaining ring body (601) are spaced apart.

6. The non-contact oil-gas sealing device according to claim 2, characterized in that: There are a plurality of outer oil retaining rings (10), and the plurality of outer oil retaining rings (10) are connected in sequence in the axial direction of the rotating shaft (20); in the axial direction of the rotating shaft (20), two adjacent first annular oil retaining portions (102) are spaced apart to define a second expansion space between the two adjacent first annular oil retaining portions (102).

7. The non-contact oil-gas sealing device according to claim 6, characterized in that: There are a plurality of inner oil retaining rings (60), which are arranged in sequence in the axial direction of the rotating shaft (20), and a second annular oil retaining portion (602) is provided between at least two adjacent first annular oil retaining portions (102).

8. The non-contact oil-gas sealing device according to claim 7, characterized in that: The plurality of inner oil retainer rings (60) and the plurality of outer oil retainer rings (10) correspond one to one in the radial direction of the non-contact oil-gas sealing device.

9. The non-contact oil-gas sealing device according to claim 1, characterized in that: The first oil outlet hole (103) is provided with a first joint (104), one end of the first conduit (701) is in communication with the first joint (104), and the other end of the first conduit (701) extends into the oil storage box (50).

10. The non-contact oil-gas sealing device according to claim 1, characterized in that: The invention also comprises a second conduit (702), wherein the second conduit (702) connects the oil storage box (50) and the oil-gas cavity (80) of the casing, and the oil (502) in the oil storage box (50) is introduced into the oil-gas cavity (80) of the casing through the second conduit (702).

11. The non-contact oil-gas sealing device according to claim 1, characterized in that: The end cover body (401) is provided with a communicating hole (404) and a communicating groove (405), wherein the communicating hole (404) is in communication with the third expansion space and the communicating groove (405), and the communicating groove (405) is in communication with the second oil outlet hole (406).

12. The non-contact oil-gas sealing device according to claim 1, characterized in that: It also includes a third conduit (703), the second oil outlet (406) is provided with a second joint, one end of the third conduit (703) is connected to the second joint, and the other end of the third conduit (703) extends into the oil storage box (50) and is located below the liquid level of the oil (502) in the oil storage box (50).

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