JPH0579051U - Bearing device for horizontal axis rotating machine - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Even if the amount of bearing lubricating oil increases beyond an appropriate amount, keep the lubricating oil circulation good and keep the bearing temperature within the allowable range. [Structure] A bearing 11 for supporting the shaft end of a rotary shaft 10 of a horizontal shaft rotating machine, a bearing box 12 for supporting the bearing 11 and forming an oil tank 14 for lubricating oil, and an oil tank 14 for a first oil tank 14a and a second oil tank 14b. The partition plate 17, the oil ring 21 that pumps the lubricating oil 15 by the rotation of the rotating shaft 10 to the upper peripheral surface of the rotating shaft 10, and the lubricating oil 15 pumped by the oil ring 21 Oil drain hole 11 for discharging to the oil tank 14b
g and an oil cooler in which the cooling pipe 19 is arranged in the second oil tank 14b, an oil ring 21
More than the appropriate amount of oil is filled into the bearing 11 and the rotating shaft 1
0 and the bearing 11 overflow without lubrication, the overflowed lubricating oil tries to return to the first oil tank 14a. The receiver 23 is provided above the oil tank 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a bearing (cylindrical sliding bearing) device for a horizontal shaft rotating machine, and particularly to a bearing device for a horizontal shaft rotating machine in which the circulation of lubricating oil is improved and the temperature rise of the bearing device is suppressed within an allowable value. It is about.

[0002]

[Prior Art]

 Generally, in a bearing device for a horizontal axis rotating machine using a cylindrical plain bearing (hereinafter referred to as a bearing), lubricating oil is stored in an oil tank formed in the lower part of the bearing box, and this lubricating oil is appropriately used. In this way, the sliding surface of the bearing is lubricated, lubricates the bearing as it passes through the inside of the bearing, is discharged from the end of the sliding surface and is returned to the oil tank.

On the other hand, when the lubricating oil passes through the sliding surface of the bearing and lubricates the bearing, the lubricating oil heats up to a high temperature due to frictional heat generated between the rotating shaft of the rotating machine and the sliding surface of the bearing. A cooling pipe of an oil cooler is inserted in the oil tank in order to cool the lubricating oil discharged from the section and returned to the oil tank.The lubricating oil cooled by this cooling pipe is applied to the sliding surface of the bearing. Re-lubricate again and circulate the lubricating oil inside the bearing.

In order to prevent the high temperature lubricating oil discharged from the end of the sliding surface of the bearing and returned to the oil tank from being supplied to the inside of the bearing without being cooled by the cooling pipe, A partition plate with a communication hole is provided in the lower part, and the upper layer in the oil tank is divided into an oil tank on the supply side of the lubricating oil for the bearing and an oil tank on the return side so that they communicate with each other only at the bottom. It is located in the oil tank.

Thus, when the bearing is lubricated from the oil tank on the supply side by the oil ring to lubricate the inside of the bearing, the return oil heated to a high temperature by frictional heat is sufficiently cooled by the cooling pipe in the oil tank on the return side. Then, it is cooled to a low temperature, is circulated to the oil tank on the supply side through the communication hole, and is supplied to the bearing again. The lubricating oil is cooled by the temperature difference between the cooling water flowing through the cooling pipe and the lubricating oil.

FIG. 3 is a side sectional view showing an outline of the entire structure of a conventional bearing device for a general horizontal shaft rotating machine. In FIG. 3, reference numeral 10 is a rotary shaft, and the rotary shaft 10 is rotatably supported by a bearing 11 which is vertically divided into two parts by a horizontal plane passing through the center line of the rotary shaft. The lower part of the bearing 11 is an oil tank formed in the lower bottom part of the bearing box 12 which is vertically divided into two parts by the horizontal plane like the bearing 11 via the lower half of the ring-shaped projection 11a provided in the center of the outer surface thereof. Is located in the center of the oil tank so as to divide it into two parts, and is supported by a bearing stand 12a having a semicircular concave portion that opens upward in the upper part, and the upper part is provided with a bearing box through the upper half of the ring-shaped projection 11a. It has a semi-circular recess located at the center of the upper part of 12 and opening downward, and is pressed by a bearing retainer 12b facing the semi-circular recess opening above the bearing base 12a. The oil tank under the bearing box 12 is divided into the two oil tanks 13 and 14 by the bearing stand 12a as described above, and the lubricating oil 15 is stored therein, and the lubricating oil 15 is communicated by the communicating hole 12c provided at the lower end of the bearing stand 12a. is doing. Further, the oil tanks 13 and 14 are divided into first oil tanks 13a and 14a and second oil tanks 13b and 14b by partition plates 16 and 17 having communication holes 16a and 17a at their lower ends, respectively. The upper surfaces of the oil surfaces of the first oil tanks 13a and 14a are inserted into the grooves 11b and 11c provided in the circumferential direction of the upper inner peripheral surface of the bearing 11, and the inner peripheral surfaces thereof are the upper outer peripheral surface of the rotating shaft 10. The lower ends of the oil rings 20 and 21 supported by are immersed in the oil in the second oil tanks 13b and 14b, respectively, and cooling pipes 18 and 19 of oil coolers (not shown) of the oil coolers are inserted into the oil in the second oil tanks 13b and 14b. Is cooled by cooling water. The sliding surface 10a of the rotary shaft 10 supported by the bearing 11 is thin and has both ends stepped, and the steps 10b and 10c are surrounded by a ring in the circumferential direction at both ends of the bearing 10 so as to surround them. -Shaped grooves 11d and 11e are provided, and oil drain ports 11f and 11g opening to the oil tanks 13a and 14a are provided at the lowermost portions of the grooves 11d and 11e.

Lubrication by the lubricating oil of the bearing device having the above configuration is performed as follows. Prior to the activation of the horizontal axis rotary machine, an oil cooler (not shown) is activated to circulate the cooling water through the respective cooling pipes 18 and 19, and then the horizontal axis rotary machine is activated. When the rotating speed of the rotating machine rises to a predetermined value, the rotating shaft 10 rotates at the same speed as the rotating machine, so that the friction between the upper peripheral surface of the sliding surface 10a and the inner peripheral surfaces of both oil rings 20, 21 is reduced. Both oil rings 20 and 21 gradually start to rotate and accelerate. When the oil rings 20 and 21 start to rotate, their lower ends are immersed in the oil surfaces of the lubricating oil 15 in the first oil tanks 13a and 14a, respectively. When it reaches the sliding surface 10a of the rotating shaft, it moves from the surfaces of the oil rings 20 and 21 to the sliding surface 10a and starts lubrication. That is, the oil rings 20 and 21 function as a pump that pumps the lubricating oil 15 in the first oil tanks 13a and 14a to the sliding surface 10a by its rotation, and the oils that are supplied as the speed of the rotating machine increases. The amount will also increase. In this way, the lubricating oil 15 is heated by frictional heat in the process of lubricating the sliding surface 10a, and when the entire surface of the sliding surface 10a is lubricated while increasing its temperature, the lubricating oil 15 is provided at both ends of the sliding surface 10a and functions as an oil drainer. Reach the stepped portions 10b, 10c and are shaken off, and are blown and gathered in the ring-shaped grooves 11d, 11e provided at both ends of the bearing 11 facing the periphery of the stepped portions 10b, 10c to be collected, and the groove 11d. , 11e are returned to the second oil tanks 13b, 14b via the oil drain ports 11f, 11g provided at the lowermost part. The high temperature lubricating oil 15 returned to the second oil tanks 13b and 14b is cooled by cooling pipes 18 and 19 inserted therein, respectively, and is divided by partition plates 16 and 17 into the first oil tanks 13a and 14a. It recirculates through the communication holes 16a and 17a, is pumped up again by the oil rings 20 and 21, and is circulated by supplying oil to the sliding surface 10a of the rotary shaft 10.

By the way, when the lubricating oil is circulated as described above, an appropriate amount of the lubricating oil 15 is pumped up from the first oil tanks 13a and 14a by the oil rings 20 and 21 and supplied to the sliding surface 10a of the rotary shaft 10. If there is, the lubricating oil supplied to the sliding surface 10a fulfills both functions of lubrication and heat absorption and rises in temperature, and all of it is returned to the second oil tanks 13b and 14b through the oil drain ports 11f and 11g. Good lubricating oil circulation is achieved.

However, when the amount of the lubricating oil 15 pumped by the oil rings 20 and 21 exceeds an appropriate amount due to the rotating machine rotating at a high speed and the oil rings 20 and 21 rotating excessively at a high speed, the lubricating oil is transferred to the rotating shaft 10. The sliding surface 10a of the bearing 11 cannot be completely filled, the grooves 11b and 11c of the bearing 11 are filled and overflow to fall into the first oil tanks 13a and 14a, and the good circulation of the lubricating oil cannot be performed.

The lubricating oil thus filled in the grooves 11b and 11c of the bearing is heated by the bearing 11 whose temperature is increased by frictional heat and the temperature is increased, and a part of the lubricating oil is stored in the first oil tanks 13a and 14a. The lubricating oil that has dropped and has risen in temperature is again pumped up by the oil rings 20 and 21, and this operation is repeated. Therefore, the temperature of the lubricating oil in the upper layer of the first oil tanks 13a and 14a gradually rises. In addition, when the lubricating oil is no longer circulated satisfactorily, the circulating flow rate of the lubricating oil, which has been cooled sufficiently in the second oil tanks 13b and 14b and has a low temperature, to the first oil tanks 13a and 14a. As a result, the function of the oil cooler deteriorates, and the temperature rise of the lubricating oil in the first oil tanks 13a and 14a is promoted, and the cooling effect of the lubricating oil on the bearing 11 is hindered. The bearing temperature rises, causing accidents such as burning of the bearing.

[0011]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that if the amount of lubricating oil pumped by the oil ring exceeds a certain value and is supplied to the bearing, the lubricating oil will not circulate well and the temperature will exceed the allowable value of the bearing. This is the point of rising.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems. A rotary shaft of a horizontal shaft rotating machine, a bearing that supports the end of the rotary shaft, and an oil tank that stores the lubricating oil that supports the bearing and lubricates the bearing. Forming a bearing box, a partition plate having a communication hole in the lower part to divide the oil tank into first and second oil tanks, and an upper inner peripheral surface of the partition plate supported by an upper outer peripheral surface of the rotating shaft. The lower end portion is immersed in the lubricating oil in the first oil tank and is rotated by the rotation of the rotating shaft to pump up the lubricating oil and supply the oil to the upper outer peripheral surface of the rotating shaft. Inside the second oil tank, there is an oil discharge hole that opens in the upper part of the second oil tank and that discharges to the second oil tank the lubricating oil that has been pumped up by the oil ring and has lubricated between the rotating shaft and the bearing. Bearing device for horizontal shaft rotary machine consisting of oil cooler with cooling pipe installed in In the lubricating oil pumped up by the oil ring, the lubricating oil that tries to return to the first oil tank without lubrication between the rotating shaft and the bearing is received An oil leak receiver leading into the oil tank is provided in the upper portion of the first oil tank.

[0013]

【Example】

 FIG. 1 is a side sectional view showing one half of one embodiment of a bearing device according to the present invention, and FIG. 2 is a front sectional view taken along the line AA in FIG. 1, both of which are the same as FIG. Are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIGS. 1 and 2, 10 is a rotating shaft, 10a is a sliding surface that slides with a bearing 11, and 11c is an oil ring 21 for supporting the oil ring 21 on the upper outer peripheral surface of the sliding surface 10a by its upper inner peripheral surface. A groove provided in the bearing 11; a bearing box 12 for accommodating the bearing 11; a bearing stand 12a for supporting the bearing 11; an oil tank 14 under the bearing box 12 in which a lubricating oil 15 is stored. It The oil tank 14 is divided into a first oil tank 14a on the supply side of the lubricating oil 15 and a second oil tank 14b on the return side of the lubricating oil by a partition plate 17 having a communication hole 17a in the lower part. The lower end of the oil ring 21 is immersed in the oil surface in 14a, the cooling pipe of an oil cooler (not shown) is inserted into the oil in the second oil tank 14b, and the cooling water is supplied by the cooler. The above configuration is similar to that of the conventional device. Reference numeral 23 is an oil leakage receiver newly provided by the present invention, and its cross section has a Z-shape as shown in FIG. 1, and as shown in FIG. One end of the first oil tank 14a is screwed to the lower side surface of the ring-shaped projection 11a of the bearing 11 so as to cover the upper portion of the first oil tank 14a, and the other end of the second oil tank 14 is passed over the upper end of the partition plate 17. Although not shown, the right end of the oil tank 14b is provided with a small hole which opens to the second oil tank 14b at an appropriate interval.

In the present invention having the above-described structure, when the lubricating oil is circulated well, the lubricating oil is pumped up from the first oil tank 14a by the oil ring 21 as in the conventional device, and the bearing 11 Lubricates between the rotary shaft 10 and the sliding surface 10a of the rotary shaft 10, finally reaches the end of the sliding surface 10a, returns from the oil discharge port 11g into the second oil tank 14b, and is cooled there. Return to 14a. Therefore, the newly installed oil leak receiver 23 does not function at all. However, if the amount of lubricating oil supplied by the oil ring 21 exceeds an appropriate amount and fills the groove 11c of the bearing 11, the lubricating oil will overflow without lubrication between the rotating shaft 10 and the bearing 11. , The overflowed lubricating oil is received by the upper surface of the oil leak receiver 23, does not fall into the first oil tank 14a, and passes through the small hole provided at the right end of the oil leak receiver 23 into the second oil tank 14b. Will be returned. That is, all of the lubricating oil that has been pumped up from the first oil tank 14a and heated up is returned to the second oil tank 14b, cooled here, and then recirculated into the first oil tank 14a. Therefore, since only the cooled and cooled lubricating oil circulates in the first oil tank 14a after the start of the rotating machine, the temperature of the lubricating oil in the first oil tank 14a is always kept low. Since the bearing is lubricated by this low temperature lubricating oil, the result is the same as when the lubricating oil circulates well, and the rise of the bearing can be suppressed within the allowable value.

[0015]

[Effect of the device]

 Although the present invention has been described in detail above, according to the present invention, an oil leakage receiver is provided so as to cover the upper portion of the lubricating oil supply side (first) oil tank, and the lubricating oil that falls without lubricating the bearing is received. Since this is introduced to the oil return side (second) oil tank, a good lubrication oil circulation is maintained at all times, and a bearing device for a horizontal axis rotating machine is obtained in which the temperature rise is suppressed within the allowable value. You can

[Brief description of drawings]

FIG. 1 is a side sectional view showing one half of one embodiment of a bearing device according to the present invention.

FIG. 2 is a front sectional view taken along the line AA of FIG.

FIG. 3 is a side sectional view showing an outline of the entire structure of a conventional bearing device for a general horizontal shaft rotating machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotating shaft, 11 ... Bearing, 11f, 11g ... Oil discharge port, 12 ... Bearing box, 13, 14 ... Oil tank, 13a, 14a ... 1st oil tank, 13b, 14b ... 2nd oil tank, 15 ... Lubricating oil , 16, 17 ... Partition plate, 16a, 17a ... Communication hole of partition plate, 18, 19 ... Cooling pipe of cooler, 20, 21 ... Oil ring, 23 ... Oil leak receiver.

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft of a horizontal shaft rotating machine, a bearing for supporting an end portion of the rotating shaft, a bearing box for supporting the bearing and forming an oil tank for storing lubricating oil for lubricating the bearing. , A partition plate having a communication hole in the lower portion to divide the oil tank into first and second oil tanks, an upper inner peripheral surface thereof supported by an upper outer peripheral surface of the rotating shaft, and a lower end portion thereof being the first And an oil ring that is immersed in the lubricating oil in the oil tank and that is rotated by the rotation of the rotating shaft to pump up the lubricating oil to supply the lubricating oil to the upper outer peripheral surface of the rotating shaft, and to the upper portion of the second oil tank that is provided in the bearing. An oil discharge hole for discharging the lubricating oil, which is opened and is pumped up by the oil ring and lubricated between the rotary shaft and the bearing, to the second oil tank, and a cooling pipe is arranged in the second oil tank. In a bearing device for a horizontal shaft rotating machine consisting of an oil cooler,
Of the lubricating oil pumped up by the oil ring, the lubricating oil that tries to return to the first oil tank without lubrication between the rotating shaft and the bearing is received, and the lubricating oil is transferred to the second oil tank. A bearing device for a horizontal shaft rotating machine, characterized in that a leading oil leak receiver is provided in the upper part of the first oil tank.