Mechanical oil-gas separation device

Abstract

The mechanical oil-gas separation device comprises a connecting shaft connected with a main shaft, an oil blocking barrel, an oil flinger and an air duct, the connecting shaft is of a hollow structure, the oil blocking barrel comprises an oil blocking section and an exhaust section, the inner end of the exhaust section is rotationally connected with the connecting shaft through a framework oil seal, and the exhaust section is communicated with an inner cavity of the connecting shaft; the oil flinger is located in the oil retaining section and is in clearance fit with the oil retaining section, an oil gas inlet, a radial flow guide hole and radial air guide holes are formed in the oil flinger, the radial air guide holes and the radial flow guide hole are axially spaced, air inlets communicated with the radial air guide holes one by one are formed in the peripheral face of the oil flinger, and air outlets communicated with the radial air guide holes one by one are formed in the end of the connecting shaft. The oil-gas separator is directly installed at the shaft end, dynamic separation of an oil-gas mixture is achieved, the separation effect is good, lubricating oil can be prevented from leaking out of the shell along with gas, the lubricating oil can be prevented from leaking from the shaft end, environmental pollution is reduced, and the oil-gas separator can be suitable for various high-speed rotating devices and is wide in application range.

Description

Technical Field

[0001] The utility model relates to the field of high-speed transmission, in particular to a mechanical oil-gas separation device. Background Art

[0002] In the mechanical field, rotating equipment usually requires a sealed cavity structure to lubricate internal components (such as bearings and gears), such as a high-speed gearbox. During the high-speed operation of the equipment, the pressure inside the cavity is often higher than that outside the cavity. On the one hand, when the lubricating oil contacts the high-speed rotating shaft, gear or bearing, the lubricating oil will be atomized, and its volume will expand to form an oil-gas mixture. On the other hand, such equipment has a forced lubrication structure, and the lubricating oil is sprayed out from the spray pipe under the action of pressure, and the rotation of the equipment will also cause the temperature inside the cavity to rise. In addition, the pressure difference between the inside and outside of the cavity will cause the oil-gas mixture inside the cavity to leak to the outside of the cavity from the skeleton oil seal at the rotating shaft end. Therefore, an oil-gas separation device is usually installed on high-speed rotating equipment for oil-gas separation.

[0003] At present, the oil-gas separation devices in high-speed rotating equipment such as industrial high-speed gearboxes mostly adopt a static structure. Generally, a breather is installed at the top of the box body, and a filter screen or filter element is installed inside the breather. The filter screen or filter element is relied on to filter the oil mist leaking from the box body, but the filtering ability of this structure is limited, and the situation of oil-gas mixture leakage often occurs. For this reason, some manufacturers install an oil mist fan at the breather cap, etc., to prevent the loss of lubricating oil and environmental pollution caused by the leakage of the oil-gas mixture, but such devices have disadvantages such as high operation and maintenance costs, complex structures, and easy failures. Summary of the Invention

[0004] In view of this, the utility model provides a mechanical oil-gas separation device, which has a simple structure and can not only achieve oil-gas separation, but also prevent the leakage of lubricating oil from the shaft end.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The mechanical oil-gas separation device described in the utility model includes a connecting shaft connected to the main shaft, an oil baffle cylinder, an oil slinger fixed on the connecting shaft, and an air duct located outside the housing. The connecting shaft is a hollow structure. The oil baffle cylinder includes an oil baffle section and an exhaust section fixed on the housing. The inner end of the exhaust section is rotatably connected to the connecting shaft through a skeleton oil seal, and the inner cavities of the exhaust section and the connecting shaft are communicated.

[0007] The oil slinger is located inside the oil retaining section. There is a gap between the outer peripheral surface of the oil slinger and the oil retaining section. The oil slinger is provided with a plurality of axial oil-gas inlets and radial diversion holes connected to the oil-gas inlets one by one. The outer orifice of the radial diversion hole communicates with the gap; the oil slinger is radially provided with a plurality of radial air guide holes. The radial air guide holes are axially spaced from the radial diversion holes. The outer peripheral surface of the oil slinger has air inlets connected to the radial air guide holes one by one. The end of the connecting shaft is provided with air outlets connected to the radial air guide holes one by one.

[0008] The beneficial effects are as follows: The utility model uses centrifugal force to throw the lubricating oil in the oil-gas onto the inner wall of the oil retaining section, realizes oil-gas separation in the gap between the oil retaining section and the oil slinger. The separated lubricating oil is blocked by the skeleton oil seal and flows back to the bottom of the housing under the action of gravity and extrusion force. The gas in the oil-gas enters the radial air guide holes through the small-diameter air inlets, and then is discharged to the outside atmosphere through the inner cavity of the connecting shaft, the exhaust section and the air duct, realizing the dynamic separation of the oil-gas mixture, having good oil-gas separation effect and avoiding the leakage of lubricating oil from the shaft end.

[0009] Preferably, a first flange is provided at the outer end of the exhaust section. The first flange is fixedly connected to the housing by bolts; the connecting end of the air duct has a second flange. The second flange is fixedly connected to the first flange by bolts. The beneficial effect is that the exhaust section and the end of the air duct of the utility model both have flanges, which is convenient for installation.

[0010] Preferably, the connecting shaft is of a stepped structure, including a first installation section and a second installation section with a diameter smaller than that of the first installation section. The oil slinger is welded on the first installation section. The inner end of the exhaust section is connected to the second installation section through the skeleton oil seal. The beneficial effect is that the shaft end of the connecting shaft of the utility model is the second installation section with a small diameter, providing installation space and ensuring the connection between the inner end of the exhaust section and the connecting shaft.

[0011] Preferably, the oil-gas inlet is close to the connecting shaft. The radial diversion hole extends radially from the oil-gas inlet to the outer peripheral surface of the oil slinger. The radial diversion hole has a guiding function; the connection between the oil-gas inlet and the radial diversion hole is of a chamfer structure or a fillet structure, which is beneficial to the flow of the oil-gas mixture.

[0012] Compared with the prior art, the utility model uses centrifugal force to throw the lubricating oil in the oil-gas onto the inner wall of the oil retaining section, realizes oil-gas separation in the gap between the oil retaining section and the oil slinger. The separated lubricating oil flows back to the bottom of the housing under the action of extrusion and gravity. The gas in the oil-gas enters the radial air guide holes through the small-diameter air inlets, and then is discharged to the outside atmosphere through the connecting shaft, the exhaust section and the air duct in sequence, realizing the dynamic separation of the oil-gas mixture, having good oil-gas separation effect and balancing the internal and external pressure differences, effectively avoiding the leakage of lubricating oil at the shaft end. Description of the Drawings

[0013] Figure 1 is a schematic structural view of the present utility model.

[0014] Figure 2 is a schematic view of the present utility model (the housing, main shaft and air duct are omitted). Specific embodiments

[0015] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments.

[0016] It should be noted that in the description of the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0017] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected" and "connected" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0018] As Figure 1-2 shown, the mechanical oil-gas separation device of the present utility model includes a connecting shaft 2 connected to the main shaft 1 of a device (such as a high-speed gearbox), an oil retaining cylinder 3 fixedly connected to the housing 5, an oil throwing disc 4 fixedly connected to the connecting shaft 2, and an air duct 6 located outside the housing 5. The connecting shaft 2 adopts a hollow structure, and its right end face is fixedly connected to the main shaft 1 through bolts. When the main shaft 1 rotates, the main shaft 1 can drive the oil throwing disc 4 to rotate synchronously through the connecting shaft 2; the oil retaining cylinder 3 includes an oil retaining section 3a and an exhaust section 3b arranged coaxially. The outer end of the exhaust section 3b is fixed to the side wall of the housing 5 through bolts, and the inner end of the exhaust section 3b is rotatably connected to the connecting shaft 2 through a skeleton oil seal 7, which on the one hand ensures the reliable installation of the oil retaining cylinder 3, and on the other hand makes the oil retaining cylinder 3 in a non-rotating state during the rotation of the connecting shaft 2; the exhaust section 3b is coaxial with the connecting shaft 2 and the inner cavities are interconnected, ensuring that the separated gas can enter the exhaust section 3b through the inner cavity of the connecting shaft 2, and then enter the air duct 6 outside the housing 5 through the exhaust section 3b to balance the pressure between the inner cavity of the housing 5 and the outside.

[0019] The diameter of the oil-blocking section 3a is larger than that of the exhaust section 3b. The oil-blocking section 3a is located outside the oil-throwing disc 4, and the axial length of the oil-blocking section 3a is greater than the axial length of the oil-throwing disc 4, so that the oil-throwing disc 4 is completely located within the oil-blocking section 3a. There is a gap K6 between the outer peripheral surface of the oil-throwing disc 4 and the oil-blocking section 3a, and there is also a clearance fit between the left disc surface of the oil-throwing disc 4 and the left side wall of the oil-blocking cylinder 3. A plurality of axial oil-gas inlets K1 and radial diversion holes K2 connected to the oil-gas inlets K1 one by one are provided on the oil-throwing disc 4. The plurality of oil-gas inlets K1 (which can be three or more) are evenly spaced in the circumferential direction and are close to the connecting shaft 2. The radial diversion holes K2 are arranged radially on the oil-throwing disc 4 and are in one-to-one communication with the oil-gas inlets K1. The radial diversion holes K2 are in communication with the gap K6 between the oil-throwing disc 4 and the oil-blocking section 3a. A plurality of radially arranged air guide holes K3 are also provided on the oil-throwing disc 4 at intervals in its circumferential direction. An air inlet K4 is provided on the outer peripheral surface of the oil-throwing disc 4 corresponding to the radial air guide holes K3, and an air outlet K5 is provided on the connecting shaft 2 corresponding thereto, thereby realizing the communication between the gap K6 and the exhaust section 3b.

[0020] During operation, the main shaft 1 drives the connecting shaft 2 and the oil-throwing disc 4 to rotate synchronously at a high speed. During the rotation, the oil-gas mixture enters the radial diversion holes K2 through the oil-gas inlets K1. The lubricating oil in the oil-gas mixture entering the radial diversion holes K2 is thrown onto the inner wall of the oil-blocking section 3a under the action of centrifugal force, realizing oil-gas separation. The separated gas enters the radial air guide holes K3 through the small-diameter air inlet K4 under the action of the pressure difference, and enters the inner cavity of the main shaft 1 through the air outlet, and then is discharged to the outside atmosphere through the exhaust section 3b and the air duct 6. The lubricating oil thrown on the oil-blocking section 3a is blocked by the skeleton oil seal 7, and together with the squeezing action of the small gap between the oil-throwing disc 4 and the oil-blocking section 3a and the self-weight action of the lubricating oil, the separated oil liquid is finally quickly returned to the bottom of the housing 5, thereby realizing the dynamic separation of the oil-gas mixture, with good separation effect. It can not only prevent the lubricating oil from being discharged together with the gas, reducing environmental pollution, but also prevent the lubricating oil from leaking from the shaft end.

[0021] During actual processing, the gap K6 between the oil-throwing disc 4 and the oil-blocking section 3a can be controlled within 5 mm. The diameters of the oil-gas inlets K1 of the oil-throwing disc 4 and the radial diversion holes K2 are both 20 mm (other values within the range of 15 mm - 25 mm are also possible). The connection between the oil-gas inlets K1 and the radial diversion holes K2 is processed into a chamfer structure (of course, it can also be a rounded corner structure), which is beneficial to the flow of the oil-gas mixture. The diameter of the radial air guide holes K3 is 23 mm (other values within the range of 15 mm - 25 mm are also possible), and the caliber of the air inlet K4 is 1.5 mm (other values within 3 mm are also possible). The present invention adopts a small-caliber air inlet K4, so that the gas enters the radial air guide holes K3 under the action of the pressure difference.

[0022] Combined Figure 1It can be seen that the outer end of the exhaust section 3b extends to the outside of the housing 5 and is fixedly connected with a first flange F1. The first flange F1 is fixedly connected with the housing 5 by bolts. The inner end of the exhaust section 3b is rotatably connected with the connecting shaft 2, thereby ensuring the stable installation of the oil baffle cylinder 3. The connecting end of the air duct 6 has a second flange F2, and the second flange F2 is fixedly connected with the first flange F1 by bolts. The flange connection facilitates installation.

[0023] Combined with Figure 2 It can be seen that the connecting shaft 2 is a stepped shaft. From the main shaft 1 to its shaft end, there are a first installation section 2a and a second installation section 2b in sequence. The diameter of the second installation section 2b is smaller than that of the first installation section 2a. The oil slinger 4 is welded on the first installation section 2a and close to the second installation section 2b. The inner end of the exhaust section 3b is rotatably connected with the second installation section 2b through a skeleton oil seal 7. The connecting shaft 2 adopts a stepped shaft with variable diameter to provide an installation space for the skeleton oil seal 7, ensure the oil seal performance between the oil baffle cylinder 3 and the connecting shaft 2, and avoid the lubricating oil thrown into the oil baffle cylinder 3 from leaking out from the connection between the oil baffle cylinder 3 and the connecting shaft 2, overcoming the problem that the shaft end of the existing high-speed rotating equipment is prone to leakage.

[0024] Combined with Figure 1-2 It can be seen that the right end of the connecting shaft 2 has a shoulder, and the shoulder is fixedly connected with the main shaft 1 by bolts. The connecting end face of the main shaft 1 has an installation groove, and the right end of the connecting shaft 2 has a boss 2c. The boss 2c is inserted into the installation groove and has an interference fit, thereby ensuring the synchronization of the connecting shaft 2 and the main shaft.

[0025] The oil-gas separation device of the present utility model is directly installed at the shaft end, which not only realizes the dynamic separation of the oil-gas mixture with good separation effect, but also can avoid the lubricating oil from leaking out of the housing 5 with the gas, and can also avoid the lubricating oil from leaking from the shaft end, reducing environmental pollution. It can be applied to a variety of high-speed rotating equipment with a wide application range.

[0026] Finally, it should be emphasized that the above-mentioned is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A mechanical oil-gas separation device, characterized in that: It includes a connecting shaft connected to the main shaft, an oil retaining cylinder, an oil throwing plate fixedly connected to the connecting shaft, and an air duct located outside the shell. The connecting shaft is a hollow structure. The oil retaining cylinder includes an oil retaining section and an exhaust section fixedly connected to the shell. The inner end of the exhaust section is rotatably connected to the connecting shaft through a skeleton oil seal, and the exhaust section is connected to the inner cavity of the connecting shaft. The oil-slinging plate is located inside the oil-blocking section, and a gap is formed between the outer circumference of the oil-slinging plate and the oil-blocking section. The oil-slinging plate is provided with a plurality of axial oil and gas inlets and radial guide holes connected one-to-one with the oil and gas inlets, and the outer openings of the radial guide holes are connected with the gap; the oil-slinging plate is provided with a plurality of radial air guide holes radially, and the radial air guide holes are axially spaced from the radial air guide holes. An air inlet connected one-to-one with the radial air guide holes is provided on the outer circumference of the oil-slinging plate, and an air outlet connected one-to-one with the radial air guide holes is provided at the end of the connecting shaft.

2. The mechanical oil-gas separation device according to claim 1, characterized in that: The outer end of the exhaust section is provided with a first flange, which is fixedly connected to the shell by bolts; the connecting end of the air duct has a second flange, which is fixedly connected to the first flange by bolts.

3. The mechanical oil-gas separation device according to claim 1, characterized in that: The connecting shaft is a step structure, including a first mounting section and a second mounting section with a diameter smaller than that of the first mounting section. The oil-slinging plate is welded to the first mounting section, and the inner end of the exhaust section is connected to the second mounting section through the skeleton oil seal.

4. The mechanical oil-gas separation device according to claim 1, characterized in that: The oil and gas inlet is close to the connecting shaft, the radial guide hole radially extends from the oil and gas inlet to the outer peripheral surface of the oil throwing plate, and the connection between the oil and gas inlet and the radial guide hole is a chamfered structure or a rounded structure.

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