A bearing end face sealing device and a hydrostatic bearing

Abstract

The utility model discloses a bearing end face sealing device, it sets up the adjusting ring cover on the sealing ring, and is clamped between the outer plate and the inner plate, the structure same of inner plate and outer plate is provided with the gas passage and the air cavity groove, and the opening one side of air cavity groove faces the lateral wall of sealing ring, and the first end of air cavity groove and gas passage are connected, the adjusting ring is provided with the air inlet channel, and the air inlet channel includes the air inlet and two gas inlets, and the air inlet is set up on the outer contour of adjusting ring, and two gas inlets are set up on the two sides of adjusting ring respectively, and are connected with the second end of gas passage of outer plate and the second end of gas passage of inner plate respectively, wherein, the gas of outside enters from the air inlet channel, and divides into the gas passage of outer plate and the gas passage of inner plate, to be transported to the corresponding air cavity groove, forms the pressure gas film covered on the outer surface of sealing ring, ensures the high -speed rotation of bearing, guarantees the effect of contactless sealing.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing technology, and in particular to a bearing end face sealing device and a liquid hydrostatic bearing. Background Technology

[0002] Hydrostatic spindles are widely used in ultra-precision machine tools, measuring instruments, and other fields due to their advantages such as high precision, high rigidity, high damping, and long life. However, during operation, a high-pressure oil film exists between the journal and the bearing of a hydrostatic spindle, and this pressurized oil leaks outward from both ends of the spindle.

[0003] Currently, commonly used sealing methods are mostly contact seals (such as rubber and plastic sealing rings) or gap seals. Contact seals suffer from friction and wear, generating heat and impurities, contaminating the working fluid, and reducing spindle accuracy and lifespan, making them unsuitable for high-speed and ultra-precision applications. While gap seals are non-contact, their sealing effect is limited. To achieve a good sealing effect, extremely small gaps are usually required, which places extremely high demands on the spindle's machining accuracy, assembly accuracy, and thermal deformation control, and also results in low dynamic sealing pressure. Utility Model Content

[0004] The purpose of this utility model is to address the technical problems existing in the background art by proposing a bearing end face sealing device.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model in the first aspect is as follows:

[0006] A bearing end face sealing device includes an outer plate, an adjusting ring, an inner plate, and a sealing ring. The adjusting ring is sleeved on the sealing ring and clamped between the outer plate and the inner plate. The inner plate has the same structure as the outer plate. The outer plate is provided with an air supply channel and an air chamber groove. The opening side of the air chamber groove faces the side wall of the sealing ring, and the air chamber groove is connected to the first end of the air supply channel. The adjusting ring is provided with an air inlet channel, which includes an air inlet and two air outlets. The air inlet is opened on the outer contour of the adjusting ring, and the two air outlets are respectively opened on both sides of the adjusting ring and are respectively connected to the second end of the air supply channel of the outer plate and the second end of the air supply channel of the inner plate. External gas enters from the air inlet channel and is diverted into the air supply channels of the outer plate and the inner plate to be delivered to the corresponding air chamber groove, forming a pressure gas film covering the outer surface of the sealing ring.

[0007] Preferably, a first sealing ring is provided at the gas inlet to seal the joint gap between the gas inlet and the second end of the gas delivery channel.

[0008] Preferably, the bearing end face sealing device further includes a second sealing ring, which is embedded in the inner ring of the sealing ring.

[0009] Preferably, the inner ring of the sealing ring is provided with a groove, and the second sealing ring is installed in the groove.

[0010] Preferably, multiple air intake channels, air delivery channels, and air chamber slots are provided.

[0011] Preferably, an air passage is connected between the air chamber groove and the first end of the air delivery channel, and the connecting end of the air passage is located at the center of the air chamber groove.

[0012] Preferably, the thickness difference between the adjusting ring and the sealing ring is the total gap value.

[0013] The technical solution adopted by this utility model in the second aspect is as follows:

[0014] A hydrostatic bearing includes a bearing body and a bearing end face sealing device as described above, which is mounted on the bearing body.

[0015] Compared with the prior art, the utility model has the following beneficial technical effects: It fits an adjusting ring onto a sealing ring and is clamped between an outer plate and an inner plate; the inner plate has the same structure as the outer plate, and the outer plate is provided with an air supply channel and an air chamber groove. The opening side of the air chamber groove faces the side wall of the sealing ring, and the air chamber groove is connected to the first end of the air supply channel; the adjusting ring is provided with an air inlet channel, which includes an air inlet and two air outlets. The air inlet is located on the outer contour of the adjusting ring, and the two air outlets are located on both sides of the adjusting ring, respectively connecting to the second end of the air supply channel of the outer plate and the second end of the air supply channel of the inner plate; external gas enters through the air inlet channel and is diverted into the air supply channels of the outer plate and the inner plate to be delivered to the corresponding air chamber groove, forming a pressure gas film covering the outer surface of the sealing ring, ensuring a non-contact sealing effect while the bearing rotates at high speed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure provided in the embodiments of this utility model;

[0017] Figure 2 This is an exploded view diagram of an embodiment provided by this utility model;

[0018] Figure 3 This is a front view of an embodiment provided by this utility model;

[0019] Figure 4 for Figure 3 Sectional view of section AA;

[0020] Figure 5 for Figure 3 Sectional view of the middle BB section;

[0021] Figure 6 for Figure 3A sectional view of the central CC section;

[0022] Figure 7 for Figure 6 A magnified view of part D in the middle.

[0023] Icon labels:

[0024] 100 Outer panel, 101 Air supply channel, 102 Air chamber slot;

[0025] 200 Adjusting ring, 201 Intake passage, 202 Intake port, 203 Outlet port, 204 First sealing ring;

[0026] 300 inner panel;

[0027] 400 sealing ring, 401 ring groove;

[0028] 500 Second sealing ring;

[0029] 600 air pores. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or assembly referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a link, or a specific connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two groups. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] like Figures 1-7 As shown, the present invention provides a bearing end face sealing device in the first aspect, including an outer plate 100, an adjusting ring 200, an inner plate 300 and a sealing ring 400. The adjusting ring 200 is sleeved on the sealing ring 400 and clamped between the outer plate 100 and the inner plate 300.

[0035] It should be noted that the bearing end face sealing device adopts a three-layer structure consisting of an outer plate 100, an adjusting ring 200, and an inner plate 300, which are sequentially spliced ​​together. The fixing method is screw fixing, as shown in the attached diagram. Figure 2 Appendix Figure 4 and appendix Figure 5 As shown, the outer plate 100, adjusting ring 200 and inner plate 300 are fastened by screws.

[0036] The inner plate 300 has the same structure as the outer plate 100. The outer plate 100 is provided with an air supply channel 101 and an air chamber groove 102. The opening side of the air chamber groove 102 faces the side wall of the sealing ring 400. The air chamber groove 102 is connected to the first end of the air supply channel 101.

[0037] The adjusting ring 200 is provided with an air intake channel 201, which includes an air inlet 202 and two air outlets 203. The air inlet 202 is opened on the outer contour of the adjusting ring 200, and the two air outlets 203 are respectively opened on both sides of the adjusting ring 200, and are respectively connected to the second end of the air outlet channel 101 of the outer plate 100 and the second end of the air outlet channel 101 of the inner plate 300.

[0038] The external gas enters through the air intake channel 201 and is diverted to the air delivery channel 101 of the outer plate 100 and the air delivery channel 101 of the inner plate 300 to be delivered to the corresponding air chamber groove 102, forming a pressure air film covering the outer surface of the sealing ring 400.

[0039] It should be noted that the inner plate 300 and the outer plate 100 have the same structure and are symmetrically arranged on both sides of the adjusting ring 200. The air intake channel 201 has an inverted T-shaped structure. The two air outlets 203 of the air intake channel 201 are respectively connected to the air outlet channels 101 of the inner plate 300 and the outer plate 100, so that the gas entering from the air intake port 202 can be respectively delivered to the air outlet channels 101 in the inner plate 300 and the outer plate 100, and enter the corresponding air chamber slots 102. It should be added that, as shown in the attached... Figure 7As shown, gas fills the gas cavity groove 102 and impacts the side wall of the sealing ring 400 to form a pressure gas film on the outer surface of the sealing ring 400. It should be noted that in actual use, the sealing ring 400 is directly sleeved on the bearing and rotates synchronously with the bearing. At this time, the outer plate 100, the adjusting ring 200 and the inner plate 300 rotate relative to the bearing. The pressure gas film acts to separate the sealing ring 400 from the outer plate 100, the adjusting ring 200 and the inner plate 300 to achieve contactless sealing and reduce the friction of the sealing ring 400 on other components.

[0040] In one embodiment of this application, a first sealing ring 204 is provided at the air inlet 203 to seal the joint gap between the air inlet 203 and the second end of the air delivery channel 101.

[0041] It should be noted that there is a small gap at the connection between the gas inlet 203 and the second end of the gas delivery channel 101. During gas transmission, some gas may leak out from this connection, reducing the amount of gas entering the gas delivery channel 101 and thus affecting the performance of forming a pressure gas film. Therefore, the gap between the gas inlet 203 and the second end of the gas delivery channel 101 is sealed by the first sealing ring 204 to reduce the possibility of gas leakage. In this embodiment, the gas inlet 203 is provided with a mounting groove for installing the first sealing ring 204, wherein the depth of the mounting groove is less than the thickness of the first sealing ring 204, so that part of the first sealing ring 204 is placed outside the mounting groove. At this time, the outer plate 100, adjustment After the assembly of the ring 200 and the inner plate 300, the air inlet 203 is connected to the second end of the air delivery channel 101. The side walls of the outer plate 100 and the inner plate 300 are attached to both sides of the adjusting ring 200. Taking the outer plate 100 as an example, since part of the first sealing ring 204 is placed outside the mounting groove, and the material used for the first sealing ring 204 is a soft and elastic material with good sealing performance, such as rubber, the part of the first sealing ring 204 placed outside the mounting groove is attached to and compressed with the side wall of the outer plate 100, so that the connection between the air inlet 203 and the second end of the air delivery channel 101 is effectively sealed by the first sealing ring 204, so that the gas entering the air delivery channel 101 does not overflow, ensuring the performance of the pressure gas film.

[0042] In one embodiment of this application, the bearing end face sealing device further includes a second sealing ring 500, which is embedded in the inner ring of the sealing ring 400.

[0043] The inner ring of the sealing ring 400 is provided with a groove 401, and the second sealing ring 500 is installed in the groove 401.

[0044] It should be noted that, since the bearings used may leak hydraulic oil axially during axial rotation, a second sealing ring 500 is added to the inner ring of the sealing ring 400. The outer contour of the second sealing ring 500 is in close contact with the inner ring of the sealing ring 400. To ensure that the second sealing ring 500 does not deviate or even detach from the sealing ring 400 during use, an annular groove 401 adapted to the shape and structure of the second sealing ring 500 is provided on the inner ring of the sealing ring 400. While limiting the deviation of the second sealing ring 500, the three surfaces of the annular groove 401 will contact the outer contour of the second sealing ring 500 to improve the assembly effect between the second sealing ring 500 and the sealing ring 400.

[0045] In one embodiment of this application, multiple air intake channels 201, air delivery channels 101, and air chamber slots 102 are provided.

[0046] See appendix Figure 2 It should be noted that the air intake channel 201, the air delivery channel 101, and the air chamber groove 102 are matched to form a pressure air film generating structure. Multiple of these structures are provided on the bearing end face sealing device. Since the outer plate 100, the adjusting ring 200, and the inner plate 300 are all circular ring structures, multiple pressure air film generating structures are arranged circumferentially. Among them, the air chamber groove 102 is semi-circular groove. Multiple air chamber grooves 102 are arranged circumferentially and form a ring-like groove structure, so that the pressure air film formed in the air chamber groove 102 acts more on the side wall of the sealing ring 400, which enhances the performance of the pressure air film, further reduces the probability of the sealing ring 400 contacting other components, and effectively achieves a contactless sealing effect.

[0047] In one embodiment of this application, an air passage 600 is connected between the air chamber groove 102 and the first end of the air delivery channel 101, and one of the connected ends of the air passage 600 is located at the center of the air chamber groove 102.

[0048] In one embodiment of this application, the thickness difference between the adjusting ring 200 and the sealing ring 400 is the total gap value.

[0049] In a second aspect, this utility model provides a hydrostatic bearing, which includes a bearing body and a bearing end face sealing device as described above, assembled on the bearing body.

[0050] It should be noted that the above descriptions are one or more embodiments provided in conjunction with specific content, and do not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A bearing end face sealing device, characterized in that, It includes an outer plate, an adjusting ring, an inner plate, and a sealing ring. The adjusting ring is sleeved on the sealing ring and clamped between the outer plate and the inner plate. The inner plate has the same structure as the outer plate. The outer plate is provided with an air supply channel and an air chamber groove. The opening side of the air chamber groove faces the side wall of the sealing ring. The air chamber groove is connected to the first end of the air supply channel. The adjusting ring is provided with an air intake channel, which includes an air inlet and two air outlets. The air inlet is opened on the outer contour of the adjusting ring, and the two air outlets are respectively opened on both sides of the adjusting ring and are respectively connected to the second end of the air outlet channel of the outer plate and the second end of the air outlet channel of the inner plate. External gas enters through the air intake channel and is diverted into the air delivery channel of the outer plate and the air delivery channel of the inner plate to be delivered to the corresponding air chamber groove, forming a pressure gas film covering the outer surface of the sealing ring.

2. The bearing end face sealing device according to claim 1, characterized in that, A first sealing ring is provided at the air inlet to seal the joint gap between the air inlet and the second end of the air delivery channel.

3. The bearing end face sealing device according to claim 1, characterized in that, It also includes a second sealing ring, which is embedded in the inner ring of the sealing ring.

4. A bearing end face sealing device according to claim 3, characterized in that, The inner ring of the sealing ring is provided with a groove, and the second sealing ring is installed in the groove.

5. A bearing end face sealing device according to claim 1, characterized in that, The air intake channel, the air delivery channel, and the air chamber slot are all provided with multiple such channels.

6. A bearing end face sealing device according to claim 5, characterized in that, An air passage is connected between the air chamber groove and the first end of the air delivery channel, and the connecting end of the air passage is located at the center of the air chamber groove.

7. A bearing end face sealing device according to claim 1, characterized in that, The thickness difference between the adjusting ring and the sealing ring is the total gap value.

8. A hydrostatic bearing, characterized in that, It includes a bearing body and a bearing end face sealing device as described in any one of claims 1-7, which is mounted on the bearing body.

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