JPH0348096A - Device for circulatingly feeding oil to bearing device - Google Patents

Abstract

PURPOSE:To prevent residence of air bubbles and to provide an increased life for an oil feed pump by providing an oil feed pump to have a delivery amount lower than that of a pump for return and feed lubricating oil in a main tank to a bearing device and an exhaust means to exhaust gas in a closed tank. CONSTITUTION:A main tank 3 to store oil fed to a bearing device is provided, and a pump 10 for return to pump out oil in a closed tank 2 to the main tank 3 is turned ON and OFF according to an oil level in the closed tank 2 connected to a route for return oil from a bearing device. In this case, a delivery amount of the pump 10 for return is set to a value higher than a flow rate of return oil. With the aid of an oil feed pump 16 having a delivery amount lower than that of the pump 10 for return, lubricating oil in the main tank 3 is fed to the bearing device. In this case, gas in the closed tank 2 is exhausted by an exhaust means 6. This constitution separates and removes mixture air in a state that air-mixed oil recovered from the bearing chamber is stored in the closed tank 2 in a negative pressure once, and prevents residence of air bubbles.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an improvement in a circulating oil supply device for a bearing device.

[Prior art] As a conventional lubricating device for a bearing device, for example,
There is one shown in Japanese Patent No.-125294. This device is equipped with an open type lubricating oil tank, and lubricating oil in the tank is sent to the bearing device using an oil supply pump to lubricate the bearing. The oil after lubrication (drain oil) is returned to the open type lubricating oil tank using a diaphragm pump, which is an oil suction means connected to an oil drain hole of the bearing device.

[Problem to be solved by the invention]

However, in the conventional system described above, the drain oil is sucked by a diaphragm pump from the oil drain hole of the bearing device and returned to the open lubricating oil tank, which requires time and effort for maintenance work such as replacing the diaphragm. There was a problem in that a large amount of air that was sent into the lubricating oil tank along with the oil remained in the oil as bubbles, making it difficult to separate them.

If the bearing device is supplied with oil using the oil supply pump while the oil contains air bubbles, the life of the pump may be shortened due to cavitation and erosion of the oil supply pump.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a circulating oil supply device for a bearing device that does not require special maintenance and does not have residual air bubbles. The purpose of this invention is to solve the above-mentioned conventional problems.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a sealed tank to which a return oil path from a bearing device is connected, a main tank that stores oil to be sent to the bearing device, and a system for pumping oil from the sealed tank into the main tank. a return pump which has a discharge rate larger than the flow rate of the return oil and is turned on and off according to the oil level in the closed tank; The present invention is characterized in that it includes an oil supply pump that supplies lubricating oil in the main tank to the bearing device, and an exhaust means that exhausts the inside of the sealed tank.

[Operation] Since the exhaust means used to recover drain oil from the bearing device does not have consumable parts such as the diaphragm in a diaphragm pump, there is no need for maintenance work even after continuous use for a long period of time. In addition, the air-mixed oil recovered from the bearing device is temporarily stored in a sealed tank with negative pressure to completely separate the mixed air. Therefore, no air bubbles remain, and performance deterioration due to air intake by the fuel pump is prevented. Thus, stable operation for a long period of time is possible [Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

The lubricating oil tank 1 is divided by a partition wall 4 into a closed tank 2 for storing return oil from the bearing device and a main tank 3 for storing the lubricating oil for the bearing device. However, it is not always necessary to use one tank dividedly, and the separately formed sealed tank 2 and the main tank 3 may be arranged close to each other.

On the side of the sealed tank 2 is a pipe 5 for return oil from the lubricating bearing.
is connected. Further, a blower 6 serving as exhaust means is disposed on the upper surface of the hermetic tank 2, a blower suction lower is connected to an opening 8 on the upper surface of the hermetic tank 2, and a blower exhaust port 9 is open to the atmosphere.

A trochoid pump 10, for example, as a return pump is further disposed on the upper surface of the hermetic tank 2 to pump out oil from the hermetic tank 2 and return it to the main tank 3. The discharge amount of this return pump 10 is set to be larger than the flow rate of oil returned to the closed tank 2. Return pump I
The O suction side piping 11 penetrates the top surface of the sealed tank 2 and extends to near the bottom surface of the tank. On the other hand, the discharge side pipe 12 opens into the main tank 3.

A float switch 13 is also attached to the sealed tank 2 as means for detecting the oil level within the tank. The oil level detection signal sent from this float switch 13 is output to the control device 14, and the control device 14 controls the drive of the drive motor 15 of the return pump IO in accordance with this oil level detection signal. There is.

The main tank 3 is provided with a trochoid pump 16 as a refueling pump, for example. The discharge amount of this oil supply pump 16 is smaller than that of the return pump 10.

A suction side pipe 17 of this oil supply pump 16 opens near the bottom surface of the main tank 3. On the other hand, the discharge side piping 18 extends toward a bearing device (not shown).

Next, we will discuss the effect.

The airtight space above the liquid level of the hermetic tank 2 is continuously evacuated by the blower 6 and has a negative pressure.

Due to the suction force of this negative pressure, the drain oil mixed with air from the bearing device is sucked into the sealed tank 2 through the return oil piping 5 and recovered. Air bubbles mixed in the collected drain oil are rapidly separated and removed by the negative pressure of the closed tank 2.

When the drain oil level reaches the upper limit level set by the float switch 13, a command is issued from the control device 14 to the return pump drive motor 15, the return pump 10 is started, and the air bubbles in the closed tank 2 are removed. The removed drain oil is pumped up and transferred to the main tank 3. Since the discharge amount of the return pump 10 is larger than the flow rate of drain oil being recovered, the oil level in the closed tank 2 gradually decreases. When the lower limit level set by the float switch 13 is reached, a stop command is issued from the control device 14 to the drive motor 15 of the return pump, and the return pump 10 is stopped.

When the return pump 10 stops, the oil level in the main tank 3 is at the upper level. This lubricating oil is pumped out by an oil supply pump 16 and supplied to the bearing device.

The oil supply pump 16 is operated continuously, but since its discharge amount is smaller than that of the return pump 10, the oil level in the closed tank 2 rises before the oil level in the main tank drops to the opening of the suction side pipe 17. Return pump lO
begins to operate, and the oil level in the main tank 3 rises. 7. Thus, the bearing device is continuously supplied with lubricating oil that does not contain air bubbles, and the performance of the oil supply pump 16 does not deteriorate due to air intake. Further, since the drain oil is sucked out from the bearing device by the blower 6, long-term operation is possible without requiring maintenance work as in the case of a diaphragm pump.

Note that a well-known type of float switch can be used as a means for detecting the oil level in the sealed tank 2.
Furthermore, in addition to float switches, well-known magnetic type,
Various types of transmitting liquid level needles can be used, such as photoelectric, capacitive, and ultrasonic types.

In addition, the means for exhausting the closed tank 2 is not limited to a blower, and various well-known vacuum pumps can be used.

Also, return pump 10. Although the oil supply pump 16 has been described as a trochoid pump, other types of well-known oil pumps such as gear pumps, vane pumps, or piston pumps can be widely used.

〔Effect of the invention〕

As explained above, according to the present invention, there is a sealed tank to which the return oil path from the bearing device is connected, a main tank that stores the oil to be sent to the bearing device, and a main tank into which the oil from the sealed tank is transferred. A return pump that pumps out the oil and has a discharge volume larger than the flow rate of the return oil and is turned on and off according to the oil level in the sealed tank, and a return pump that has a discharge volume smaller than the return pump. The apparatus further includes an oil supply pump for supplying lubricating oil in the main tank to the bearing device, and an exhaust means for exhausting the inside of the sealed tank. Therefore, there is no need for maintenance work that would be required when using a diaphragm pump to collect drain oil from the bearing device, and there is no risk of shortening the service life of the oil supply pump as there is no residual air bubbles. , the effect of enabling long-term stable operation can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the present invention. 2 is a closed tank, 3 is a main tank, 6 is an exhaust means, 10 is a return pump, 13 is an oil level detection means, and 16 is an oil supply pump.

Claims (1)

[Claims] (1) A sealed tank to which the return oil path from the bearing device is connected, a main tank that stores the oil to be sent to the bearing device, and a pump that pumps the oil from the sealed tank to the main tank, and the return oil a return pump that has a discharge rate larger than the flow rate of the main tank and is turned on and off according to the oil level in the sealed tank; and a return pump that has a discharge rate smaller than the return pump and carries the lubricating oil in the main tank. 1. A circulating oil supply device for a bearing device, comprising: a fuel pump for supplying oil to the device; and an exhaust means for exhausting the inside of the sealed tank.