External oil baffle device for vertical roots blower

Abstract

The utility model provides an external oil baffle device for a vertical Roots blower, which is provided with a wall plate, through holes are respectively arranged on the wall plate close to the upper end and the lower end, the through holes are of stepped hole structures, and a driving impeller shaft and a driven impeller shaft are respectively arranged in the two through holes in a penetrating manner. Bearings are fixedly arranged on the outer circumference of the driving impeller shaft and the outer circumference of the driven impeller shaft respectively, bearing glands are fixedly arranged on the axial outer sides of the bearings, the radial inner sides of the bearing glands and bearing outer rings of the bearings are axially fixed and locked, and oil receiving plates and oil blocking covers are fixedly arranged on the axial outer sides of the bearings on the outer sides of the driving impeller shaft and the driven impeller shaft respectively. The Roots blower solves the technical problem that when an existing Roots blower operates, internal lubricating oil leaks towards the interior of a cover plate from a gap in a bearing or a gap between the bearing and adjacent parts and finally falls into the bottom of the cover plate, and long-term accumulation is formed. The utility model can be widely applied to the vertical roots blower.

Description

Technical Field

[0001] The utility model relates to an external oil retaining device, in particular to an external oil retaining device for a vertical Roots blower. Background Art

[0002] Vertical Roots blower is a positive displacement blower. The two blade-shaped rotors are supported by bearings at both ends. When in operation, the two blade-shaped rotors move relative to each other in the housing under the support of the bearings to compress and transport the gas. This blower has a simple structure and is easy to manufacture. It is widely used in aquaculture oxygenation, sewage treatment aeration, cement transportation and other industries.

[0003] In order to ensure the stability of the bearing's long-term high-speed rotation, lubricating oil is required to effectively lubricate the bearing. However, due to the long-term high-speed rotation of the rotor, part of the lubricating oil on the bearing leaks into the cover plate through the gaps on the bearing or the gaps between the bearing and adjacent components, and eventually falls to the bottom of the cover plate, forming a long-term accumulation.

[0004] However, since the leaked lubricating oil still has a high degree of cleanliness and can be used again, if it accumulates at the bottom of the cover for a long time, it will cause a waste of lubricating oil. In addition, as the lubricating oil leaks and accumulates for a long time, the amount of lubricating oil in the lubricating oil tank will gradually decrease. If the amount of lubricating oil is too little, the bearings and other components inside the blower will not be adequately lubricated and cooled, thereby reducing the service life of the bearings and other components.

[0005] In addition, if the lubricating oil accumulates at the bottom of the cover plate for a long time, the lubricating oil will gradually leak out through the gap between the cover plate and the wall plate, eventually polluting the external environment. Utility Model Content

[0006] In view of the above technical problems, the utility model provides an external oil baffle device for a vertical Roots blower. The external oil baffle device for a vertical Roots blower can, under the interaction of an oil receiving plate and an oil baffle cover, on the one hand, realize rapid recovery of leaked lubricating oil, and guide the recovered lubricating oil to the bearing on one side of the active impeller shaft, so as to effectively lubricate and cool the bearing, thereby increasing the service life of the bearing in the blower and preventing the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time; on the other hand, it can prevent the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time, causing the lubricating oil to gradually leak out through the gap between the cover plate and the wall panel, thereby eventually causing pollution to the external environment.

[0007] To this end, the technical solution of the utility model is an external oil retaining device for a vertical Roots blower, which is provided with a wall panel, a cover panel is fixedly provided on the axial outer side of the wall panel, and a through hole is respectively provided at a position near the upper end and the lower end of the wall panel, and the through hole is a stepped hole structure, and an active impeller shaft is penetrated inside the stepped hole near the lower end of the wall panel, and a driven impeller shaft is penetrated inside the stepped hole near the upper end of the wall panel, and the active impeller shaft and the driven impeller shaft are meshed and rotated with each other;

[0008] A bearing is provided on the outer circumference of the active impeller shaft, the inner ring of the bearing is fixedly connected to the outer circumference of the active impeller shaft, a bearing seat is provided on the outer circumference of the bearing, the outer circumference of the outer ring of the bearing is fixedly connected to the inner circumference of the bearing seat, and the outer circumference of the bearing seat is fixedly connected to the axial outer side of the step hole of the wall plate near the lower end;

[0009] A bearing cover is provided on the axially outer end of the bearing seat, the radially outer portion of the bearing cover is axially fixedly connected to the bearing seat, and the radially inner portion of the bearing cover is axially fixedly locked to the bearing outer ring of the bearing;

[0010] An oil receiving plate is provided at the axial outer end of the bearing gland, and the oil receiving plate includes an oil receiving plate fixing section, an oil receiving plate connecting section, and an oil receiving plate guiding section. The oil receiving plate fixing section is located at the lower end of the oil receiving plate, the oil receiving plate connecting section is located at the middle position of the oil receiving plate, and the oil receiving plate guiding section is located at the upper end of the oil receiving plate;

[0011] The axial outer end of the bearing gland is axially fixedly connected to the fixed section of the oil receiving plate;

[0012] The connecting section of the oil receiving plate is a trapezoidal structure, and the connecting section of the oil receiving plate of the trapezoidal structure gradually narrows from top to bottom;

[0013] The oil receiving plate guide section is inclined at an angle toward the inner side of the oil receiving plate connecting section;

[0014] Drainage plates are respectively provided at both sides of the oil receiving plate connecting section, the lower sections of the two drainage plates are respectively fixedly connected to the two sides of the oil receiving plate connecting section, the upper sections of the two drainage plates are respectively fixedly connected to the two sides of the oil receiving plate guiding section, the uppermost ends of the two drainage plates exceed the two sides of the oil receiving plate guiding section, and an oil drainage groove is formed between the drainage plates, the oil receiving plate connecting section and the oil receiving plate guiding section;

[0015] The fixed section of the oil receiving plate is a hollow structure, and an oil storage baffle is fixedly provided on the lower section of the inner circumference of the fixed section of the oil receiving plate. The oil storage baffle is inclined at an angle toward the inner side of the fixed section of the oil receiving plate. The bottom end position of the upper end surface of the oil storage baffle is higher than the bottom end position of the inner circumference of the bearing gland on one side of the active impeller shaft, and the outermost position of the other end of the oil storage baffle is bent upward at an angle;

[0016] A bearing is provided on the outer circumference of the driven impeller shaft, the inner ring of the bearing is fixedly connected to the outer circumference of the driven impeller shaft, a bearing seat is provided on the outer circumference of the bearing, the outer circumference of the outer ring of the bearing is fixedly connected to the inner circumference of the bearing seat, and the outer circumference of the bearing seat is fixedly connected to the axial outer side of the step hole of the wall plate near the lower end;

[0017] A bearing cover is provided on the axially outer end of the bearing seat, the radially outer portion of the bearing cover is axially fixedly connected to the bearing seat, and the radially inner portion of the bearing cover is axially fixedly locked to the bearing outer ring of the bearing;

[0018] An oil shield is provided at the axial outer end of the bearing gland. The oil shield is a fan-shaped structure. The oil shield includes an oil shield fixing section and an oil shield oil shield section. The oil shield fixing section is located at the lower end of the oil shield, and the oil shield oil shield section is located at the upper end of the oil shield. The oil shield section of the oil shield is inclined at an angle toward the outer side of the oil shield fixing section.

[0019] The outermost positions of both ends of the oil shield are bent upwards to form oil drainage grooves.

[0020] Preferably, the outermost positions at both ends of the guide section of the oil receiving plate and the guide plate are connected to each other through an arc surface transition.

[0021] Preferably, the angle between the oil receiving plate connecting section and the oil receiving plate guiding section is 95°-135°;

[0022] The angle between the fixed section of the oil receiving plate and the oil storage baffle is 95°-135°.

[0023] Preferably, the oil receiving plate guide section and the oil receiving plate connecting section are transitioned through an arc surface.

[0024] Preferably, a plurality of mounting holes are provided on the fixing section of the oil receiving plate, and the fixing section of the oil receiving plate is axially locked by passing locking screws through the mounting holes and the bearing gland;

[0025] A plurality of mounting holes are arranged on the fixing section of the oil shield, and the fixing section of the oil shield is axially locked by locking screws passing through the mounting holes and the bearing gland.

[0026] Preferably, a plurality of weight-reducing holes are provided on the fixing section of the oil shield.

[0027] The beneficial effect of the utility model is that, by fixing the oil receiving plate and the oil shield at the axial outer positions of the bearings on one side of the active impeller shaft and the driven impeller shaft respectively, when the active impeller shaft and the driven impeller shaft are meshed and rotated at a high speed, when the lubricating oil inside the blower leaks outward through the bearing on one side of the driven impeller shaft or the gap between the bearing and the adjacent parts, under the action of the centrifugal force generated by the high-speed rotation of the driven impeller shaft and the bearing, the lubricating oil splashing upward will splash onto the oil shield, and the lubricating oil on the oil shield will be drained downward along the oil drainage groove on the oil shield and fall into the oil receiving plate guide section of the oil receiving plate, and the lubricating oil on the oil receiving plate guide section will flow along the oil drainage groove and through the oil receiving plate connecting section to the oil receiving plate fixed section, and then, the lubricating oil on the oil receiving plate fixed section will continue to flow downward and finally gather at the lower end position of the oil storage baffle plate, and then the lubricating oil will flow to the bearing on one side of the active impeller shaft through the oil storage baffle plate and the bearing pressure cover in turn, so as to lubricate and cool the bearing;

[0028] Through the interaction between the oil collecting plate and the oil baffle, on the one hand, the leaked lubricating oil can be quickly recovered, and the recovered lubricating oil can be directed to the bearing on the side of the active impeller shaft to effectively lubricate and cool the bearing, thereby increasing the service life of the bearing in the blower and preventing the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time. On the other hand, it can prevent the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time, causing the lubricating oil to gradually leak out through the gap between the cover plate and the wall panel, ultimately polluting the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a three-dimensional diagram of the oil receiving plate structure of the utility model;

[0030] Figure 2 This is a three-dimensional diagram of the structure of the oil shield in the utility model;

[0031] Figure 3 It is a three-dimensional diagram of the application effect of the utility model;

[0032] Figure 4 This is the main view of the application effect of the utility model;

[0033] Figure 5 This utility model Figure 4 Middle AA section view;

[0034] Figure 6 This utility model Figure 2 Enlarged view of point B in the middle.

[0035] Explanation of symbols in the figure:

[0036] 1. Oil receiving plate; 101. Oil receiving plate fixed section; 102. Oil receiving plate connecting section; 103. Oil receiving plate guide section; 104. Drainage plate; 105. Oil storage baffle plate; 106. Oil drainage groove; 2. Oil shield; 201. Oil shield fixed section; 202. Oil shield oil shield section; 203. Oil drainage groove; 3. Mounting hole; 4. Weight reduction hole; 5. Wall panel; 6. Bearing; 7. Bearing seat; 8. Bearing gland; 9. Active impeller shaft; 10. Driven impeller shaft; 11. Locking screw; 12. Cover plate. DETAILED DESCRIPTION

[0037] The utility model is further described below in conjunction with embodiments.

[0038] pass Figure 1-Figure 6 It can be seen that the vertical Roots blower uses an external oil baffle device, which is provided with a wall panel 5. A cover plate 12 is fixedly provided on the axial outer side of the wall panel 5. The wall panel 5 is provided with through holes near the upper end and the lower end respectively. The through holes are step hole structures. The inside of the step hole near the lower end of the wall panel 5 is penetrated by an active impeller shaft 9, and the inside of the step hole near the upper end of the wall panel 5 is penetrated by a driven impeller shaft 10. The active impeller shaft 9 and the driven impeller shaft 10 are meshed and rotated with each other.

[0039] A bearing 6 is provided on the outer circumference of the active impeller shaft 9, and the inner ring of the bearing 6 is fixedly connected to the outer circumference of the active impeller shaft 9. A bearing seat 7 is provided on the outer circumference of the bearing 6, and the outer circumference of the outer ring of the bearing 6 is fixedly connected to the inner circumference of the bearing seat 7. The outer circumference of the bearing seat 7 is fixedly connected to the axial outer side of the step hole of the wall panel 5 near the lower end.

[0040] A bearing cover 8 is provided on the axially outer end of the bearing seat 7. The radially outer portion of the bearing cover 8 is axially fixedly connected to the bearing seat 7, and the radially inner portion of the bearing cover 8 is axially fixedly locked to the bearing outer ring of the bearing 6.

[0041] An oil receiving plate 1 is provided at the axial outer end of the bearing cover 8, and the oil receiving plate 1 includes an oil receiving plate fixed section 101, an oil receiving plate connecting section 102, and an oil receiving plate guide section 103. The oil receiving plate fixed section 101 is located at the lower end position of the oil receiving plate 1, the oil receiving plate connecting section 102 is located at the middle position of the oil receiving plate 1, and the oil receiving plate guide section 103 is located at the upper end position of the oil receiving plate 1.

[0042] The axially outer end portion of the bearing cover 8 is axially fixedly connected to the oil receiving plate fixing section 101 .

[0043] The oil receiving plate connecting section 102 is a trapezoidal structure, and the trapezoidal structure of the oil receiving plate connecting section 102 gradually narrows from top to bottom, which can ensure that the lubricating oil flowing down from the oil receiving plate guide section 103 can be smoothly drained to the middle position of the oil receiving plate fixed section 101, thereby preventing the lubricating oil from splashing to the outside of the oil receiving plate fixed section 101 and finally falling to the bottom of the cover plate 12 to form a long-term accumulation. The lubricating oil accumulates at the bottom of the cover plate for a long time, which will cause the lubricating oil to gradually leak out through the gap between the cover plate 12 and the wall panel 5, and finally pollute the external environment.

[0044] The oil receiving plate guide section 103 is inclined at an angle toward the inner side of the oil receiving plate connecting section 102. When the lubricating oil falls from the oil baffle 2, it can ensure that the lubricating oil falls smoothly onto the oil receiving plate guide section 103, preventing the lubricating oil from falling into the bottom of the cover plate 12 and forming a long-term accumulation. If the lubricating oil accumulates at the bottom of the cover plate for a long time, it will cause the lubricating oil to gradually leak out through the gap between the cover plate 12 and the wall panel 5, eventually causing pollution to the external environment.

[0045] Drainage plates 104 are respectively provided at both sides of the oil receiving plate connecting section 102, and the lower sections of the two drainage plates 104 are respectively fixedly connected to the two sides of the oil receiving plate connecting section 102, and the upper sections of the two drainage plates 104 are respectively fixedly connected to the two sides of the oil receiving plate guiding section 103, and the uppermost ends of the two drainage plates 104 exceed the two sides of the oil receiving plate guiding section 103. An oil drainage groove 106 is formed between the drainage plates 104, the oil receiving plate connecting section 102, and the oil receiving plate guiding section 103. A part of the lubricating oil falling on the oil receiving plate guiding section 103 flows to the oil receiving plate fixed section 101 through the oil drainage groove 106, forming effective drainage, preventing the lubricating oil from falling into the bottom of the cover plate 12 and forming long-term accumulation. The lubricating oil accumulates at the bottom of the cover plate for a long time, which will cause the lubricating oil to gradually leak out through the gap between the cover plate 12 and the wall panel 5, and eventually pollute the external environment.

[0046] The oil receiving plate fixed section 101 is a hollow structure, and an oil storage baffle 105 is fixedly provided on the lower section of the inner circumference of the oil receiving plate fixed section 101. The oil storage baffle 105 is inclined at an angle toward the inner side of the oil receiving plate fixed section 101. The bottom end position of the upper end surface of the oil storage baffle 105 is higher than the bottom end position of the inner circumference of the bearing pressure cover 8 on the side of the active impeller shaft 9, which can form an effective height difference, and can ensure that the lubricating oil flowing to the bottom end of the oil storage baffle 105 can smoothly flow through the bearing pressure cover 8 to the bearing, so as to lubricate and cool the bearing.

[0047] The outermost position of the other end of the oil storage baffle 105 is bent upward at an angle to block the lubricating oil that flows to the bottom end of the oil storage baffle 105, thereby forming an effective oil storage space, thereby preventing excessive lubricating oil on the oil storage baffle 105 from accumulating and leaking outward, and eventually falling into the bottom of the cover plate 12 to form a long-term accumulation.

[0048] A bearing 6 is provided on the outer circumference of the driven impeller shaft 10, and the inner ring of the bearing 6 is fixedly connected to the outer circumference of the driven impeller shaft 10. A bearing seat 7 is provided on the outer circumference of the bearing 6, and the outer circumference of the outer ring of the bearing 6 is fixedly connected to the inner circumference of the bearing seat 7. The outer circumference of the bearing seat 7 is fixedly connected to the axial outer side of the step hole of the wall panel 5 near the lower end.

[0049] A bearing cover 8 is provided on the axially outer end of the bearing seat 7. The radially outer portion of the bearing cover 8 is axially fixedly connected to the bearing seat 7, and the radially inner portion of the bearing cover 8 is axially fixedly locked to the bearing outer ring of the bearing 6.

[0050] An oil shield 2 is provided at the axial outer end of the bearing cover 8. The oil shield 2 is a fan-shaped structure. The oil shield 2 includes an oil shield fixing section 201 and an oil shield oil shield section 202. The oil shield fixing section 201 is located at the lower end of the oil shield 2, and the oil shield oil shield section 202 is located at the upper end of the oil shield 2. The oil shield oil shield section 202 is inclined at an angle toward the outer side of the oil shield fixing section 201, which can effectively block the lubricating oil splashed from the bearing position on one side of the impeller shaft 10, and prevent the lubricating oil from splashing randomly in the cover plate 12.

[0051] The outermost positions at both ends of the oil shield 2 are bent upward to form oil drainage grooves 203, and the lubricating oil splashed onto the oil shield fixed section 201 and the oil shield oil shield section 202 can be smoothly drained to the oil drainage grooves 203 under the drainage effect of the fan-shaped structure, and then continue to be drained to the lower end through the oil drainage grooves 203, and finally accurately fall into the oil receiving plate 1 to realize the recovery of the lubricating oil.

[0052] The oil receiving plate 1 and the oil shield 2 are both located inside the accommodating cavity formed between the shield plate 12 and the wall plate 5 .

[0053] The outermost positions at both ends of the oil receiving plate guide section 103 and the guide plate 104 are connected by an arc surface transition, which can further ensure that the lubricating oil falling into the two ends of the oil receiving plate guide section 103 can smoothly enter the oil drainage groove 106 under the guidance of the arc surface.

[0054] The angle between the oil receiving plate connecting section 102 and the oil receiving plate guiding section 103 is 95°-135°, thereby forming a certain guiding slope in the oil receiving plate guiding section 103. When the lubricating oil falls onto the oil receiving plate guiding section 103, the slope on the oil receiving plate guiding section 103 can, on the one hand, guide the lubricating oil downwardly inwardly, and on the other hand, buffer and unload the lubricating oil, thereby preventing the fallen lubricating oil from rebounding upward again.

[0055] If the angle is too small, the fallen lubricating oil will be drained to the outside and downward, directly causing the lubricating oil to fall into the external environment and cause pollution. If the angle is too large, the drainage speed of the fallen lubricating oil will be accelerated, resulting in less buffering for the lubricating oil and irregular splashing of the lubricating oil.

[0056] The angle between the oil receiving plate fixed section 101 and the oil storage baffle 105 is 95°-135°, forming a slope of the oil storage baffle 105 that is high on the outside and low on the inside. The slope can guide the lubricating oil entering the oil storage baffle 105 to one side of the bearing, ensuring that the lubricating oil can smoothly pass through the oil storage baffle 105 and the bearing cover 8 into the interior of the bearing to lubricate and cool the bearing.

[0057] The oil receiving plate guide section 103 and the oil receiving plate connecting section 102 are transitioned by an arc surface, which can ensure that part of the lubricating oil falling on the oil receiving plate guide section 103 can smoothly flow into the oil receiving plate connecting section 102, effectively reducing the resistance to the flow of the lubricating oil.

[0058] The oil receiving plate fixing section 101 is provided with a plurality of mounting holes 3, and the oil receiving plate fixing section 101 is axially locked by passing the locking screws 11 through the mounting holes 3 and the bearing cover 8. The oil deflector cover fixing section 201 is provided with a plurality of mounting holes 3, and the oil deflector cover fixing section 201 is axially locked by passing the locking screws 11 through the mounting holes 3 and the bearing cover 8.

[0059] The oil plate 1 and the oil shield 2 are respectively locked by the locking screws 11, so that quick disassembly can be achieved, the operation is simple and convenient, and working time is saved.

[0060] A plurality of weight-reducing holes 4 are provided on the oil shield fixing section 201, which can reduce the weight of the oil shield 2 and reduce the processing cost without affecting the normal use of the oil shield 2.

[0061] The external oil retaining device is configured by fixing an oil receiving plate 1 and an oil retaining cover 2 at the axial outer sides of the bearings on one side of the active impeller shaft 9 and the driven impeller shaft 10, respectively. When the active impeller shaft 9 and the driven impeller shaft 10 mesh and rotate at high speed, when the lubricating oil inside the blower leaks outward through the bearings on one side of the driven impeller shaft 10 or the gap between the bearings and adjacent parts, the lubricating oil splashing upwards will splash onto the oil retaining cover 2 under the centrifugal force generated by the high-speed rotation of the driven impeller shaft 10 and the bearings. The lubricating oil on the oil shield 2 is drained downward along the oil drainage groove on the oil shield 2 and falls into the oil receiving plate guide section of the oil receiving plate. The lubricating oil on the oil receiving plate guide section flows along the oil drainage groove and through the oil receiving plate connecting section to the fixed section of the oil receiving plate. Then, the lubricating oil on the fixed section of the oil receiving plate continues to flow downward and finally gathers at the lower end position of the oil storage baffle. Then, the lubricating oil flows to the bearing on the side of the active impeller shaft 9 through the oil storage baffle 105 and the bearing pressure cover 8 in turn to lubricate and cool the bearing.

[0062] Through the interaction between the oil collecting plate 1 and the oil shield 2, on the one hand, the leaked lubricating oil can be quickly recovered, and the recovered lubricating oil can be directed to the bearing on the side of the active impeller shaft to effectively lubricate and cool the bearing, thereby increasing the service life of the bearing in the blower and preventing the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time. On the other hand, it can prevent the leaked lubricating oil from accumulating at the bottom of the cover plate for a long time, causing the lubricating oil to gradually leak out through the gap between the cover plate and the wall panel, ultimately polluting the external environment.

[0063] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. An external oil retaining device for a vertical Roots blower, characterized by: A wall plate is provided, a cover plate is fixedly provided on the axial outer side of the wall plate, through holes are respectively provided at positions near the upper end and the lower end of the wall plate, the through holes are step hole structures, an active impeller shaft is penetrated inside the step hole near the lower end of the wall plate, and a driven impeller shaft is penetrated inside the step hole near the upper end of the wall plate, and the active impeller shaft and the driven impeller shaft are meshed and rotated with each other; A bearing is provided on the outer circumference of the active impeller shaft, the inner ring of the bearing is fixedly connected to the outer circumference of the active impeller shaft, a bearing seat is provided on the outer circumference of the bearing, the outer circumference of the outer ring of the bearing is fixedly connected to the inner circumference of the bearing seat, and the outer circumference of the bearing seat is fixedly connected to the axial outer side of the step hole of the wall plate near the lower end; A bearing cover is provided on the axially outer end of the bearing seat, the radially outer portion of the bearing cover is axially fixedly connected to the bearing seat, and the radially inner portion of the bearing cover is axially fixedly locked to the bearing outer ring of the bearing; An oil receiving plate is provided at the axial outer end of the bearing gland, and the oil receiving plate includes an oil receiving plate fixing section, an oil receiving plate connecting section, and an oil receiving plate guiding section. The oil receiving plate fixing section is located at the lower end of the oil receiving plate, the oil receiving plate connecting section is located at the middle position of the oil receiving plate, and the oil receiving plate guiding section is located at the upper end of the oil receiving plate; The axial outer end of the bearing gland is axially fixedly connected to the fixed section of the oil receiving plate; The oil receiving plate connecting section is a trapezoidal structure, and the oil receiving plate connecting section of the trapezoidal structure gradually narrows from top to bottom; The guide section of the oil receiving plate is inclined at an angle toward the inner side of the connecting section of the oil receiving plate; Drainage plates are respectively arranged at both sides of the oil receiving plate connecting section, the lower sections of the two drainage plates are respectively fixedly connected to the two sides of the oil receiving plate connecting section, the upper sections of the two drainage plates are respectively fixedly connected to the two sides of the oil receiving plate guiding section, the uppermost ends of the two drainage plates exceed the two sides of the oil receiving plate guiding section, and the drainage grooves are formed between the drainage plates, the oil receiving plate connecting section and the oil receiving plate guiding section; The oil receiving plate fixing section is a hollow structure, and an oil storage baffle is fixedly provided on the lower section of the inner circumference of the oil receiving plate fixing section, and the oil storage baffle is inclined at an angle toward the inner side of the oil receiving plate fixing section, and the bottom end position of the upper end surface of the oil storage baffle is higher than the bottom end position of the inner circumference of the bearing gland on one side of the active impeller shaft, and the outermost position of the other end of the oil storage baffle is bent upward at an angle; A bearing is provided on the outer circumference of the driven impeller shaft, the inner ring of the bearing is fixedly connected to the outer circumference of the driven impeller shaft, a bearing seat is provided on the outer circumference of the bearing, the outer circumference of the outer ring of the bearing is fixedly connected to the inner circumference of the bearing seat, and the outer circumference of the bearing seat is fixedly connected to the axial outer side of the step hole of the wall plate near the lower end; An oil shield is provided at the axial outer end of the bearing gland, the oil shield is a fan-shaped structure, the oil shield comprises an oil shield fixing section and an oil shield oil shield section, the oil shield fixing section is located at the lower end of the oil shield, the oil shield oil shield section is located at the upper end of the oil shield, and the oil shield oil shield section is inclined at an angle toward the outer side of the oil shield fixing section; The outermost positions of both ends of the oil shield are bent upwards to form oil drainage grooves.

2. The external oil retaining device for a vertical Roots blower according to claim 1 is characterized in that: The outermost positions of both ends of the oil receiving plate guide section and the guide plate are connected to each other through an arc surface transition.

3. The external oil retaining device for a vertical Roots blower according to claim 1 is characterized in that: The angle between the oil receiving plate connecting section and the oil receiving plate guiding section is 95°-135°; The angle between the fixed section of the oil receiving plate and the oil storage baffle is 95°-135°.

4. The external oil retaining device for a vertical Roots blower according to claim 1 is characterized in that: The oil receiving plate guide section and the oil receiving plate connecting section are transitioned through an arc surface.

5. The external oil retaining device for a vertical Roots blower according to claim 1 is characterized in that: The oil receiving plate fixing section is provided with a plurality of mounting holes, and the oil receiving plate fixing section is axially locked by locking screws passing through the mounting holes and the bearing gland; The oil shield fixing section is provided with a plurality of mounting holes, and the oil shield fixing section is axially locked by locking screws passing through the mounting holes and the bearing gland.

6. The external oil retaining device for a vertical Roots blower according to claim 1, characterized in that: A plurality of weight-reducing holes are arranged on the oil shield fixing section.

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