A decanter centrifuge oil return box

Abstract

The utility model relates to the technical field of horizontal centrifuge, specifically disclose a horizontal screw centrifuge oil return box, including the oil return box body of installing just below the bearing seat, the oil return box body top with the oil return port intercommunication of bearing seat bottom, the oil return box body bottom is equipped with the inclined bottom surface, the inclination angle of inclined bottom surface is 3 degrees 10 degrees, and the lowest end of inclined bottom surface is communicated with the oil tank through the oil return pipeline, the middle upper portion of oil return box body is equipped with the exhaust valve. The scheme is used to reduce the gas resistance, air pocket problem of traditional horizontal screw centrifuge lubricating system because of gas accumulation.

Description

Technical Field

[0001] This utility model relates to the field of horizontal centrifuge technology, specifically to an oil return box for a horizontal screw centrifuge. Background Technology

[0002] Horizontal screw centrifuges are key equipment for solid-liquid separation in chemical, pharmaceutical, food processing and environmental protection industries. Stable lubrication of their main bearings is crucial for the long-term reliable operation of the equipment.

[0003] Traditional horizontal screw centrifuges typically employ a closed-loop oil return pipe structure in their lubrication systems. Lubricating oil flows from the bearing housing through the return pipe back to the oil tank via gravity or an external oil pump, forming a circulating lubrication system. However, in actual operation, air can easily get into the lubricating oil or bubbles can form. Traditional return pipes lack effective venting capabilities, preventing timely gas removal and causing a series of lubrication problems.

[0004] This technology has the following main drawbacks:

[0005] (1) Gas cannot be expelled, forming a gas blockage.

[0006] A closed-loop oil return pipeline structure cannot actively expel gas mixed with lubricating oil, causing gas to accumulate in the pipeline and form a gas lock. This gas lock hinders the normal flow of lubricating oil, resulting in poor oil return, local oil pressure fluctuations, and consequently affecting the stability of bearing oil supply.

[0007] (2) Risk of cavitation damage

[0008] Unvented air in high-speed flowing lubricating oil can cause cavitation. When oil flows through a localized low-pressure area, dissolved gases in the oil are released and form bubbles. These bubbles then rapidly burst in the high-pressure area, generating micro-jet impacts. This cavitation effect can cause cavitation corrosion on metal surfaces (such as bearings and pipe inner walls), accelerating component damage and reducing equipment lifespan over long-term operation.

[0009] (3) Lubrication efficiency decreases and temperature rise intensifies.

[0010] Air resistance and cavitation lead to uneven and incomplete lubricating oil film, decreased lubricating oil level in the bearing housing, increased bearing frictional heat, and accelerated wear under long-term operation, thus shortening service life.

[0011] Existing technologies, such as the lubrication system of a horizontal centrifuge described in patent CN207880415U, involve lubricating oil flowing from the return port at the bottom of the bearing lubrication chamber, returning to the oil tank via a return pipe, and then being pumped back to the inlet of the bearing lubrication chamber by an oil pump after being filtered by an oil filter, forming a closed loop. Although this technology incorporates temperature and pressure sensors on the return pipe for fault monitoring, it still employs a completely closed design. This prevents the effective expulsion of gas from the lubricating oil, easily leading to air blockages and cavitation in the pipeline, thus affecting lubrication performance. Utility Model Content

[0012] The present invention aims to provide an oil return box for a horizontal screw centrifuge, which reduces the occurrence of air resistance and cavitation problems caused by air accumulation in the lubrication system of a traditional horizontal screw centrifuge.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A horizontal screw centrifuge oil return box includes an oil return box body installed directly below a bearing housing. The top of the oil return box body is connected to an oil return port at the bottom of the bearing housing. The bottom of the oil return box body is provided with an inclined bottom surface. The lowest end of the inclined bottom surface is connected to an oil tank through an oil return pipe. An exhaust valve is provided in the upper middle part of the oil return box body.

[0015] The principle and advantages of this solution are as follows: This solution replaces the original traditional oil return pipe with an oil return box body equipped with an exhaust valve, allowing the gas that enters the oil return process along with the lubricating oil to be discharged from the exhaust valve. This prevents air from being trapped during the oil return process, ensures smooth oil passage, improves oil return efficiency, reduces the content of free gas in the oil, reduces the probability of cavitation, and helps to improve the uniformity and integrity of the lubricating oil film on the bearing contact surface, thereby improving the lubrication efficiency of the lubrication system and extending the service life of the bearing.

[0016] In addition, in this design, the bottom surface of the oil return box is sloping, so that the lubricating oil collected in the oil return box can flow to the oil return pipeline connected at the lowest end, and the lubricating oil can be sent back to the oil tank in a timely manner.

[0017] Preferably, as an improvement, the inclination angle of the inclined bottom surface is 3°-10°.

[0018] Preferably, as an improvement, the cross-section of the inclined bottom surface is V-shaped, so that the inclined bottom surface forms a V-shaped oil return groove, and the lowest end of the V-shaped oil return groove is connected to the oil return pipeline to improve the oil return efficiency.

[0019] Preferably, as an improvement, the exhaust valve is a spring-loaded exhaust valve. When the air pressure in the return oil box exceeds a set threshold, the exhaust valve automatically opens to exhaust air; it automatically closes after the air pressure returns to normal, which ensures timely exhaust and prevents lubricating oil leakage.

[0020] Preferably, as an improvement, the oil return box body is fixed to the bottom of the bearing seat pad used to support the bearing seat. The bearing seat pad has a through hole, and the top of the oil return box is connected to an exhaust pipe. The exhaust pipe passes through the through hole and is connected to the exhaust valve. This solution simplifies the exhaust path, ensures that the gas can be discharged quickly, and does not affect the overall structural strength of the bearing seat.

[0021] Preferably, as an improvement, a filter screen is provided on the exhaust passage of the exhaust valve to filter the gas passing through the exhaust valve. This filter screen effectively prevents external dust from entering the oil return box, thereby avoiding contamination of the lubricating oil. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the horizontal screw centrifuge after the oil return box, bearing seat, and oil return pipeline are connected according to Embodiment 1 of this utility model.

[0023] Figure 2 This is a front view schematic diagram of the oil return box of the horizontal screw centrifuge according to Embodiment 1 of this utility model.

[0024] Figure 3 This second embodiment of the present invention only shows a schematic diagram of the structure of the return oil pipeline and the inclined bottom surface of the return oil box body.

[0025] The reference numerals in the accompanying drawings include: 1. Oil return box body, 11. Inclined bottom surface, 2. Exhaust valve, 3. Bearing seat pad, 4. Bearing seat, 5. Exhaust pipe, 6. Short oil return pipe, 7. Long oil return pipe, 8. Oil return pipe connector. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] Example 1

[0028] Combination Figure 1 and Figure 2 A horizontal screw centrifuge oil return box includes an oil return box body 1 installed directly below a bearing housing 4. The top of the oil return box body 1 is connected to the oil return port at the bottom of the bearing housing 4 through a short oil return pipe 6. The bottom of the oil return box body 1 is provided with an inclined bottom surface 11 with an inclination angle of 3°-10°. The lowest end of the bottom of the oil return box body 1 is connected to an oil return pipe 7. The oil outlet end of the oil return pipe 7 is connected to an oil tank through an oil return connector. In this embodiment, the oil return pipe 7 is referred to as a long oil return pipe 7.

[0029] The top of the oil return box body 1 is connected to an exhaust pipe 5, and an exhaust valve 2 is connected to the exhaust pipe 5.

[0030] To facilitate venting and maintenance of the vent valve 2, the oil return box body 1 is fixed to the bottom of the bearing seat pad 3 used to support the bearing seat 4. The bearing seat pad 3 has a through hole, and the vent pipe 5 passes through the through hole and is connected to the vent valve 2.

[0031] During operation, the lubricating oil flowing from the oil outlet of bearing housing 4 enters the return oil box body 1 after passing through the short return oil pipe 6. Guided by the inclined V-shaped return oil groove, it quickly converges into the return oil pipe 7 (i.e., the long return oil pipe 7), and finally, the lubricating oil returns to the oil tank through the return oil pipe joint 8. The gas that enters with the lubricating oil reaches the exhaust valve 2 through the exhaust pipe 5. When the gas pressure exceeds the set threshold, the exhaust valve 2 automatically opens to exhaust gas; it automatically closes when the gas pressure returns to normal. This structure ensures timely gas discharge, reducing or even avoiding the occurrence of air resistance and cavitation problems, while also preventing lubricating oil leakage.

[0032] Example 2

[0033] Combination Figure 3 Example 2 is a further improvement on Example 1. Specifically, the cross-section of the inclined bottom surface 11 of the oil return box body 1 is V-shaped, so that the inclined bottom surface 11 forms a V-shaped oil return groove, thereby improving the oil return efficiency.

[0034] Example 3

[0035] Example 3 is a further improvement on Example 1, specifically, the exhaust valve 2 is a spring-loaded exhaust valve 2.

[0036] Example 4

[0037] Example 4 is a further improvement on Example 1. Specifically, a filter screen is installed on the exhaust channel of the exhaust valve 2 to filter the gas passing through the exhaust valve 2. The filter screen can effectively block external dust from entering the oil return box body 1 and prevent contamination of the lubricating oil.

[0038] This embodiment replaces the traditional return oil pipe with a return oil box equipped with an exhaust valve 2, effectively solving the problem of gas accumulation. The inclined V-shaped return oil groove design improves the return oil efficiency, and the spring-loaded exhaust valve 2 ensures reliable gas discharge. The overall structure is simple and reliable, significantly improving the stability of the lubrication system.

[0039] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An oil return box for a horizontal decanter centrifuge, characterized in that: It includes an oil return box body installed directly below the bearing housing. The top of the oil return box body is connected to the oil return port at the bottom of the bearing housing. The bottom of the oil return box body is provided with an inclined bottom surface. The lowest end of the inclined bottom surface is connected to the oil tank through an oil return pipeline. An exhaust valve is provided in the upper middle part of the oil return box body.

2. The oil return box for a horizontal screw centrifuge according to claim 1, characterized in that: The inclination angle of the inclined bottom surface is 3°-10°.

3. The oil return box for a horizontal screw centrifuge according to claim 2, characterized in that: The inclined bottom surface has a V-shaped cross-section, which forms a V-shaped oil return groove. The lowest end of the V-shaped oil return groove is connected to the oil return pipeline.

4. The oil return box for a horizontal screw centrifuge according to any one of claims 1-3, characterized in that: The exhaust valve is a spring-loaded exhaust valve.

5. The oil return box for a horizontal screw centrifuge according to any one of claims 1-3, characterized in that: The oil return box body is fixed to the bottom of the bearing seat pad plate used to support the bearing seat. The bearing seat pad plate has a through hole, and the top of the oil return box is connected to an exhaust pipe. The exhaust pipe passes through the through hole and is connected to the exhaust valve.

6. The oil return box for a horizontal screw centrifuge according to any one of claims 1-3, characterized in that: The exhaust valve is equipped with a filter screen in its exhaust passage to filter the gas passing through the exhaust valve.

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