CN107269571A - A kind of bearing in pump case lubricating-oil self-circulating system - Google Patents

Abstract

The invention discloses a lubricating oil self-circulation system for a pump bearing box, which comprises a bearing box, a bearing is installed in the bearing box, and the bearing is tightly fitted with a pump shaft through a shaft sleeve; the upper end of the pump shaft protrudes from the box cover of the bearing box, and the lower end The bottom cover of the bearing box protrudes; in the bearing box, the cavity between the lower end surface of the bearing and the bottom cover forms an oil storage cavity, and an oil outlet channel is opened inside the bottom cover; an oil return channel is opened inside the top cover; the oil outlet channel The oil inlet faces the circumferential surface of the pump shaft; the lower end of the sleeve extends downward to the oil inlet of the oil outlet passage; an oil delivery groove is arranged on the sleeve wall at the lower end of the sleeve; as the pump shaft rotates, the The oil delivery groove can be aligned with the oil inlet of the oil outlet passage, and the lubricating oil in the oil storage chamber can be thrown into the oil outlet passage; as the pump shaft rotates, the sleeve wall of the shaft sleeve can close the oil inlet to maintain the delivery pressure ; The oil outlet channel is connected with the oil return channel through the oil return pipe. The invention utilizes lubricating oil to carry out circular lubrication and heat absorption to the bearing, thereby improving the heat dissipation efficiency of the bearing.

Description

Lubricating oil self-circulation system for pump bearing box

technical field

The invention relates to a pump bearing box, in particular to a self-circulating system capable of lubricating oil.

Background technique

The bearing box is a box part that supports and lubricates the bearing, and at the same time bears the axial and radial forces generated by the equipment during operation. In equipment with a rotating shaft, the shaft is generally supported by bearings for rotation, and the bearings are installed in a bearing box, which is filled with lubricating oil, so that the bearings are lubricated during work. In the prior art, as shown in Figure 1, the oil storage chamber in the pump bearing box is a cavity located below the bearing, and the bearing 1b is repaired by injecting lubricating oil that can cover the bearing 1b into the oil storage chamber 1c. lubricating. However, since the temperature of the bearing 1b increases with the rotation of the pump shaft 1a, the bearing 1b not only needs to be lubricated, but also needs to be cooled. However, in the prior art, only the upper layer of lubricating oil 1d can absorb heat and cool down the bearing. The cooling efficiency is low, and the cooling effect is not obvious, resulting in serious heating of the bearing, shortening its life, and even affecting the normal operation of the equipment.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a lubricating oil self-circulation system for the pump bearing box, which solves the technical problem of low heat dissipation efficiency of the bearing in the prior art, and can use the lubricating oil to carry out circulating lubrication and heat absorption on the bearing, improving the The heat dissipation efficiency of the bearing.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a self-circulation system for lubricating oil in a pump bearing box, including a bearing box, a bearing is installed in the bearing box, and the bearing is tightly connected to the pump shaft through a shaft sleeve; the pump The upper end of the shaft protrudes from the cover of the bearing box, and the lower end protrudes from the bottom cover of the bearing box. The upper and lower ends of the pump shaft are respectively sealed with the top cover and the bottom cover through the sealing mechanism; The cavity between them forms an oil storage chamber, and an oil outlet channel is opened inside the bottom cover; an oil return channel is opened inside the top cover; the oil outlet of the oil return channel is located above the bearing and faces the upper end surface of the bearing; The oil inlet of the oil outlet passage on the bottom cover faces the circumferential surface of the pump shaft; the lower end of the sleeve extends downwards to below the oil inlet of the oil outlet passage; the sleeve wall at the lower end of the sleeve is provided with an oil delivery groove; With the rotation of the pump shaft, the oil delivery groove on the shaft sleeve can be aligned with the oil inlet of the oil outlet passage, thereby connecting the oil storage chamber and the oil outlet passage, and pressing the lubricating oil in the oil storage chamber into the oil outlet passage; With the rotation of the pump shaft, the sleeve wall of the shaft sleeve can close the oil inlet to maintain the delivery pressure; the oil outlet of the oil outlet passage is connected with the oil inlet of the oil return passage through the oil return pipe.

Preferably, the upper end of the shaft sleeve is tightly connected to the pump shaft, and the middle and lower ends of the shaft sleeve are in clearance fit with the pump shaft; the lower end of the pump shaft is sealed with the outer end surface of the bottom cover through the cylindrical oil pan; the cylindrical oil The bottom shell includes a cylinder that is inserted into the shaft sleeve and sleeved on the pump shaft. The inner wall of the cylinder fits with the pump shaft in a clearance, and the outside of the cylinder avoids clearance with the shaft sleeve. It is fixed on the outer end surface of the bottom cover; the flange is attached to the outer end surface of the bottom cover, and is sealed with the outer end surface of the bottom cover through a sealing ring.

Preferably, the upper and lower ends of the oil return pipe are respectively connected to the oil inlet of the oil return channel and the oil outlet of the oil outlet channel through sealing joints.

Preferably, there are two oil delivery grooves; the two oil delivery grooves are arranged symmetrically with respect to the axis of the pump shaft.

Preferably, the upper end of the oil delivery groove is located above the inner end surface of the bottom cover, and the lower end of the oil delivery groove is located below the oil inlet of the oil outlet channel.

Preferably, the oil outlet channel is arranged on one side of the bottom cover, and the oil inlet channel is arranged on the same side as the oil outlet channel on the top cover.

Compared with the prior art, the present invention has the following beneficial effects:

1. Use the pump shaft to drive the shaft sleeve to rotate, and set an oil delivery groove on the shaft sleeve. After the lubricating oil enters the oil delivery groove, with the rotation of the shaft sleeve, when the oil delivery groove is aligned with the oil inlet of the oil outlet channel, the lubrication in the oil delivery groove Under the action of centrifugal force, the oil is thrown into the oil outlet channel; with the high-speed rotation of the pump shaft, the oil delivery tank continuously throws lubricating oil into the oil outlet channel, thereby forming a continuous flow of liquid in the oil outlet channel and the oil return pipe. With the continuous increase of the liquid, the pressure of the liquid in the oil outlet passage and the oil return pipe continues to increase, so that the lubricating oil is pressed into the oil return passage, and the lubricating oil comes out from the oil outlet in the oil return passage and falls to the upper end surface of the bearing. , and then pass through the inside of the bearing, and fall back into the oil storage chamber through the lower end surface of the bearing, so as to complete the circulating cooling and lubrication of the bearing.

2. With the rotation of the pump shaft, the sleeve wall of the shaft sleeve can close the oil inlet, preventing the lubricating oil in the oil outlet passage from flowing back into the oil storage chamber, causing the pressure drop of the lubricating oil in the oil outlet passage, thereby maintaining the delivery pressure.

3. Since the lubricating oil in the oil delivery tank comes from the lower layer of the oil storage chamber, the oil temperature of the lower layer is lower than that of the upper layer, and the lubricating oil circulated to the bearing comes from the lower layer of the oil storage chamber, which can greatly improve the heat absorption efficiency of the lubricating oil, thereby improving the bearing performance. cooling efficiency.

4. Since the inner ring in the bearing rotates with the pump shaft, when lubricating one side of the bearing, the lubricating oil on one side of the bearing will be brought to the other side with the rotation of the inner ring of the bearing, thus the other side of the bearing will be lubricated. The side is also lubricated and heat-absorbed, so that only one side of the bearing housing needs to be provided with a circulating oil circuit (oil outlet channel, oil return pipe and oil return channel), which greatly simplifies the structure and reduces the cost.

5. By setting a cylindrical oil sump to seal between the lower end of the pump shaft and the bottom cover, when the lubricating oil penetrates into the shaft sleeve from the gap between the shaft sleeve and the bottom cover, the cylinder prevents the pump shaft from contacting the lubricating oil. Avoid leakage caused by lubricating oil flowing out from the lower end of the pump shaft along the pump shaft; in addition, the flange on the cylindrical oil pan can prevent leakage caused by lubricating oil flowing out from the outer end surface of the bottom cover.

6. Two symmetrical oil delivery grooves are set on the shaft sleeve, which can increase the oil inlet efficiency of the oil outlet channel, so that the circulating oil circuit can be filled with lubricating oil more quickly, shorten the cycle period, and improve the heat dissipation efficiency of the bearing.

7. Since the bearing is lubricated and cooled by the circulating oil circuit (oil outlet channel, oil return pipe and oil return channel), there is no need to immerse the bearing in lubricating oil for lubricating and cooling, thus greatly reducing the amount of lubricating oil.

Description of drawings

Fig. 1 is a structural schematic diagram of a box of a pump bearing in the prior art;

Fig. 2 is a schematic structural diagram of a lubricating oil self-circulation system for a pump bearing box in this specific embodiment.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

As shown in Figure 2, a bearing box lubricating oil self-circulation system for a pump includes a bearing box, a bearing 2 is installed in the bearing box, and the bearing 2 is tightly connected to the pump shaft 1 through the shaft sleeve 6; the upper end of the pump shaft 1 The top cover 3 of the bearing box protrudes, and the lower end extends out of the bottom cover 4 of the bearing box. The upper and lower ends of the pump shaft 1 are respectively sealed with the top cover 3 and the bottom cover 4 through the sealing mechanism; in the bearing box, the lower end surface of the bearing 2 The cavity between the bottom cover 4 and the bottom cover 4 forms an oil storage chamber. The bottom cover 4 has an oil outlet passage 41 inside; the top cover 3 has an oil return passage 31 inside; the oil outlet of the oil return passage 31 is located at the bearing 2, and towards the upper end surface of the bearing 2; the oil inlet of the oil outlet passage 41 on the bottom cover 4 faces the circumferential surface of the pump shaft 1; the lower end of the sleeve 6 extends downward to the oil inlet of the oil outlet passage 41 Below; the sleeve wall at the lower end of the sleeve 6 is provided with an oil delivery groove 61; with the rotation of the pump shaft 1, the oil delivery groove 61 on the sleeve 6 can be aligned with the oil inlet of the oil outlet passage 41, thereby connecting the storage The oil chamber and the oil outlet passage 41, and press the lubricating oil in the oil storage chamber into the oil outlet passage 41; with the rotation of the pump shaft 1, the sleeve wall of the sleeve 6 can close the oil inlet to maintain the delivery pressure; The oil outlet of the oil outlet passage 41 communicates with the oil inlet of the oil return passage 31 through the oil return pipe 7 .

When the pump shaft 1 rotates, the shaft sleeve 6 tightly fitted with the pump shaft 1 rotates together with the pump shaft, and when the shaft sleeve 6 rotates until the oil delivery groove 61 on the shaft sleeve 6 is aligned with the oil inlet of the oil outlet passage 41, the output The oil tank 61 communicates with the oil storage chamber and the oil outlet channel 41, and the lubricating oil in the oil delivery channel 41 is thrown into the oil outlet channel 41 under the action of centrifugal force; with the high-speed rotation of the pump shaft 1, the oil delivery tank 61 continuously flows toward the oil outlet channel. Lubricating oil is thrown into 41 to form a continuous flow of liquid in the oil outlet passage 41 and the oil return pipe 7. As the liquid continues to increase, the pressure of the liquid in the oil outlet passage 41 and the oil return pipe 7 continues to increase, so that the lubricating The oil is pressed into the oil return channel 31, and the lubricating oil comes out from the oil outlet in the oil return channel 31, falls to the upper end surface of the bearing 2, passes through the inside of the bearing 3, and falls back into the oil storage cavity through the lower end surface of the bearing 3, thereby Complete the circulation cooling and lubrication of the bearing 2.

The pump shaft 1 continues to rotate, and the oil delivery groove 61 is separated from the oil inlet of the oil outlet passage 41, so that the sleeve wall of the shaft sleeve 6 seals the oil inlet, preventing the lubricating oil in the oil outlet passage 41 from flowing back into the oil storage chamber, causing The pressure of lubricating oil in the oil outlet channel 41 drops, thereby maintaining the delivery pressure. In order to ensure that the sleeve wall closes the oil inlet, the diameter of the round hole protruding from the lower end of the pump shaft 1 provided on the bottom cover 4 is equal to the outer diameter of the sleeve 6 .

In this embodiment, the upper end of the shaft sleeve 6 is tightly connected to the pump shaft 1, and the middle and lower ends of the shaft sleeve 6 are in clearance fit with the pump shaft 1; the lower end of the pump shaft 1 is connected to the bottom cover 4 through the cylindrical oil pan 5 The outer end face of the cylinder is sealed; the cylindrical oil pan 5 includes a cylinder inserted into the shaft sleeve 6 and sleeved on the pump shaft 1, the inner wall of the cylinder is in clearance fit with the pump shaft 1, and the outer wall of the cylinder is in clearance fit with the shaft sleeve 6 The lower end of the cylinder is provided with a flanging, and the flanging is fixed on the outer end surface of the bottom cover 4 by screws; Sealing, the outer end surface of the bottom cover 4 is provided with an annular groove to accommodate the sealing ring, and the flange is pressed against the outer end surface of the bottom cover 4 by screws, so that the sealing ring can compensate for the gap between the flange and the outer end surface of the bottom cover 4 through deformation , so as to achieve the purpose of sealing.

By setting the cylindrical oil pan 5 to seal between the lower end of the pump shaft 1 and the bottom cover 4, when lubricating oil penetrates into the shaft sleeve 6 from the gap between the shaft sleeve 6 and the bottom cover 4, the cylinder prevents the pump shaft 1 from In contact with the lubricating oil, avoid the leakage caused by the lubricating oil flowing out from the lower end of the pump shaft 1 along the pump shaft 1; in addition, the flanging on the cylindrical oil pan 5 can prevent the leakage caused by the lubricating oil flowing out from the outer end surface of the bottom cover 4.

In this embodiment, the upper and lower ends of the oil return pipe 7 are respectively connected to the oil inlet of the oil return channel 31 and the oil outlet of the oil outlet channel 41 through sealed joints. In this way, the sealing performance of the oil return line can be improved, thereby ensuring the delivery pressure of the circulating oil line (the oil outlet passage 41 , the oil return pipe 7 and the oil return passage 31 ).

In this embodiment, the number of the oil delivery grooves 61 is two; the two oil delivery grooves are arranged symmetrically with respect to the axis of the pump shaft 1 . In this way, two symmetrical oil delivery grooves 61 are set on the shaft sleeve 6, which can increase the oil inlet efficiency of the oil outlet passage, make the circulating oil passage can be filled with lubricating oil more quickly, shorten the cycle period, and thereby improve the heat dissipation efficiency of the bearing .

In this embodiment, the upper end of the oil delivery tank 61 is located above the inner end surface of the bottom cover 4 , and the lower end of the oil delivery tank 61 is located below the oil inlet of the oil outlet channel 41 . In this way, it is ensured that the lubricating oil in the oil storage cavity can smoothly enter the oil delivery groove 61 , and at the same time, it is ensured that the lubricating oil in the oil delivery groove 61 can smoothly enter the oil outlet passage 41 . As for the shape of the oil delivery groove 61, the oil delivery groove 61 can be a vertical groove whose height is greater than its width, or a transverse groove whose width is greater than its height.

In this embodiment, the oil outlet passage 41 is arranged on one side of the bottom cover 4 , and the oil inlet passage 31 is arranged on the same side of the top cover 3 as the oil outlet passage 41 . Since the inner ring of the bearing 2 rotates with the pump shaft 1, when lubricating one side of the bearing 2, with the rotation of the inner ring of the bearing 2, the lubricating oil on one side of the bearing 2 will be brought to the other side, thereby The other side of the bearing 2 is also lubricated and absorbs heat, so that only one side of the bearing box needs to be provided with a circulating oil circuit (oil outlet channel 41, oil return pipe 7 and oil return channel 31), which greatly simplifies the structure and reduces the costs.

Claims (6)

1. being provided with bearing in a kind of bearing in pump case lubricating-oil self-circulating system, including bearing housing, bearing housing, bearing passes through axle It is locked and is connected with pump shaft；The case lid of bearing housing is stretched out in the pump shaft upper end, and lower end is stretched out above and below the bottom of bearing housing, pump shaft Two ends are sealed with top cover, bottom respectively by sealing mechanism；In the bearing housing, the cavity between bearing lower surface and bottom Form shoe cream room, it is characterised in that：Oil discharge passage is provided with inside the bottom；Drainback passage is provided with inside top cover；The oil return The oil-out of passage is located above bearing, and towards bearing upper surface；The oil inlet of oil discharge passage is towards pump shaft on the bottom Periphery；The axle sleeve lower end is extended downward into below the oil inlet of oil discharge passage；Set on the axle sleeve wall of the axle sleeve lower end There is input oil groove；With the rotation of pump shaft, the input oil groove on axle sleeve can be directed at the oil inlet of oil discharge passage, so as to connect shoe cream room With oil discharge passage, and the lubricating oil in shoe cream room is got rid of in oil discharge passage；With the rotation of pump shaft, the axle sleeve wall of axle sleeve can Oil inlet is closed, to keep discharge pressure；The oil-out of oil discharge passage is connected with the oil inlet of drainback passage by oil return pipe.

2. bearing in pump case lubricating-oil self-circulating system according to claim 1, it is characterised in that：The axle sleeve upper end with In the middle part of pump shaft tight fit connection, axle sleeve and lower end coordinates with pump shaft gap；The pump shaft lower end passes through tubular oil sump and bottom Outer face sealing；The tubular oil sump includes in insertion axle sleeve and is socketed in the cylinder on pump shaft, cylinder inboard wall face and pump Shaft clearance coordinates, and cylinder body outer wall face coordinates with axle sleeve gap；The cylinder lower end is provided with flange, and flange is fixed by screws in bottom On the outer face of lid；The flange is fitted on the outer face of bottom, and is sealed by sealing ring and bottom outer face.

3. bearing in pump case lubricating-oil self-circulating system according to claim 1, it is characterised in that：Above and below the oil return pipe Two ends are connected by the oil-out of the oil inlet of seal nipple and drainback passage, oil discharge passage respectively.

4. bearing in pump case lubricating-oil self-circulating system according to claim 1, it is characterised in that：The number of the input oil groove Measure as two；Two input oil grooves are set on the axisymmetrical of pump shaft.

5. bearing in pump case lubricating-oil self-circulating system according to claim 1, it is characterised in that：The input oil groove upper end Above bottom inner face, input oil groove lower end is located at below the oil inlet of oil discharge passage.

6. bearing in pump case lubricating-oil self-circulating system according to claim 1, it is characterised in that：The oil discharge passage is set Put in the side of bottom, oil inlet passage is arranged on top cover and oil discharge passage identical side.