JPH04179891A - Rotary pump - Google Patents

Abstract

PURPOSE:To prevent abraded dust from entering into bearings and lengthen the service life of the bearings by forming an air blasting passage passing through a connecting part around the connecting part to connect an output shaft of a driving means to a rotary shaft of a rotary pump, and carrying out a pump operation while blasting air to the connecting part through the air blasting passage. CONSTITUTION:An air blasting passage 18 leading to a discharge port 16 from a release port 14 is formed between a pump frame 5 and a motor frame 11 opposed to each other by passing through a circular space A formed around a connecting part to connect a rotary shaft 7 to an output shaft 8, and the circular space A is communicated with the release port 14 and the discharge port 16 through a groove part 13. Discharge air produced simultaneously with an operation of a vacuum pump 1 flows through the air blasting passage 18 from the release port 14 by opening a check valve 15, and is discharged into a motor 2 from the discharge port 16, and is exhausted outside of the motor 2 from an exhaust cylinder 17. Thereby, abraded dust produced in an engaging part can be prevented from entering into bearings, and the bearings 3 and 9 can be also cooled by means of the discharge air so that the service life of the bearings 3 and 9 can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary pump that is rotationally driven by a driving means.

[Prior Art] As a rotary pump, for example, there is a rolling piston vacuum pump that supplies a negative pressure source for a vacuum booster.

This vacuum pump is driven intermittently by a motor, and as shown in FIG. are fitted together and are drivingly connected.

[Problems to be Solved by the Invention] However, the fitting portion (unevenness) between the motor output shaft 100 and the pump rotating shaft 200 requires a manufacturing clearance δ (see FIG. 5).

Therefore, by performing intermittent driving by the motor, repeated collisions occur at the fitting portion between the motor output shaft 100 and the pump rotating shaft 200, and as a result, abrasion powder is generated due to abrasion of both.

As a result, the motor side bearing 102 and the pump side bearing 20
2, and the motor frame 103 and pump frame 20
Abrasion powder accumulates in the volume surrounded by part 104.204 (range shown by the check pattern in Fig. 6) of the mounting spigot with 3, and the abrasion powder enters the inside of the bearing 102.202.
This had the problem of significantly reducing the life of the bearings 102 and 202.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a rotary pump that prevents abrasion powder from entering the inside of the bearing and extends the life of the bearing.

[! II! Means for Solving the Problems] In order to achieve the above object, the present invention provides a non-lubricated rotary pump that is intermittently driven by a drive means, in which the output shaft of the drive means and the rotation shaft of the rotary pump are connected to each other. The technical means is to form a ventilation passage passing through the joint in the vicinity of the joint, and to operate the pump while blowing air to the joint through the ventilation passage.

[Operations and Effects of the Invention] The present invention having the above-mentioned configuration has the following advantages: When the pump is intermittently driven by the drive means, the output shaft and the rotation are Abrasion powder generated by abrasion with the shaft can be forcibly discharged to the outside.

Therefore, there is no accumulation of wear powder around the joint between the output shaft and the rotating shaft, and as a result, the wear powder can be prevented from entering the inside of the bearing, thereby extending the life of the bearing.

[Embodiment] Next, a rotary pump of the present invention will be described based on an embodiment shown in the drawings. 9 FIG. 1 is a sectional view of a main part of a vacuum pump, and FIG. 2 is a side sectional view of the vacuum pump.

As shown in FIG. 2, the vacuum pump 1 of this embodiment is a non-lubricated rotary pump that is intermittently driven by a motor 2 serving as a driving means.

The pump 1 includes a rotating shaft 7 supported at both ends by a pump frame 5.6 via bearings 3.4, and the rotating shaft 7 is coupled to an output shaft 8 of the motor 2 which is axially butted against each other. ing. Similarly to the rotating shaft 7, the output shaft 8 of the motor 2 is
Both ends are supported by a motor frame 11 and a motor cover 12 via bearings 9.10.

The connection between the rotating shaft 7 of the pump 1 and the output shaft 8 of the motor 2 is as follows.
This is done by fitting a protrusion 7a formed at the tip of the rotating shaft 7 into a recess 8a formed at the tip of the output shaft 8. In addition, the axis alignment of the rotating shaft 7 and the output shaft 8 is performed at each mounting pilot part 5a of the facing pump frame 5 and motor frame 11.
, 11a (see FIGS. 3 and 4).

Here, the mounting pilot part 5a of the pump frame 5 is formed in an annular shape over the entire circumference, as shown in FIG.
As shown in FIG. 3, the mounting slot portions 11a of the motor frame 11 are provided only on the left and right sides, and are not provided on the upper and lower portions. A groove portion 13 having an arc shape is formed in the upper and lower removed portions.

A discharge port 14 for discharging air discharged from the vacuum pump 1 is formed in the pump frame 5.
A check valve 15 is provided on the opening surface of the vacuum pump 4 to prevent discharged air from flowing back into the vacuum pump 1.

The motor frame 11 also includes a discharge port 1 for discharging discharge air released from the discharge port 14 to the outside of the pump 1.
6 is formed, and a discharge port 1 is formed on the side of the motor cover 12.
6 to the inside of motor 2.
A discharge pipe 17 is provided for discharging to the outside.

Then, the pump frame 5 and the motor frame 1 face each other.
1, a ventilation passage 18 is formed which communicates from the discharge port 14 to the discharge port 16 through an annular space A formed around the joint portion of the rotating shaft 7 and the output shaft 8.

The annular space A is formed between the bearing 3 and the bearing 9 at the inner periphery of the mounting pilot part 5a, Ila (range shown by the check pattern in FIGS. 1, 3, and 4), and It communicates with the discharge port 14 and the discharge 016 via the groove 13 .

In addition, in this embodiment, by shortening the axial length of the mounting pilot part 5a of the pump frame 5 to obtain the distance between the pump frame 5 and the motor frame 11 (dimension X in Figure 1), the discharge air can be reduced. Aisle surfaces are ensured.

Next, the operation of this embodiment will be explained.

When the motor 2 operates, its rotational output is transmitted from the output shaft 8 of the motor 2 to the rotating shaft 7, and the well-known vacuum pump 1 is operated.

The discharged air generated by the operation of the vacuum pump 1 opens the check valve 15 from the discharge port 14, flows through the ventilation passage 18, is discharged from the discharge port 16 into the motor 2, and is discharged from the discharge pipe 17 to the outside of the motor 2. \It will be discharged.

Here, since the alignment of the output shaft 8 of the motor 2 and the rotating shaft 7 of the pump 1 is performed using the mounting pilot parts 5a and 11a, the fitting part (uneven part) between the output shaft 8 and the rotating shaft 7 is , as shown in FIG. 5, a manufacturing clearance δ is required. Therefore, as the motor 2 is driven intermittently, collisions occur repeatedly at the fitting portion between the output shaft 8 and the rotary shaft 7, resulting in wear at the fitting portion and generation of abrasion powder.

At this time, when the discharged air discharged from the discharge port 14 flows through the annular space A forming a part of the ventilation passage 18, it passes through the joint between the rotating shaft 7 and the output shaft 8, and the fitting part The abrasion powder generated in
7 to the outside of the motor 2.

In this way, by flowing the discharge air of the vacuum pump 1 into the annular space A formed around the joint between the output shaft 8 and the rotating shaft 7, the wear particles generated at the fitting part enter the inside of the bearing. In addition, the bearing 3.9 can be cooled by the discharged air. As a result, bearing 3.
9 can be extended in life.

Furthermore, by locating the discharge port 16 provided in the motor frame 11 near the brush 19 of the motor 2, it is possible to discharge wear powder from the brush 19 and cool the brush 19, thereby extending the life of the brush 19. is also possible.

In this embodiment, the discharge air of the vacuum pump 1 is blown to the joint between the output shaft 8 of the motor 2 and the rotating shaft 7 of the pump 1. However, with a rotary pump other than the vacuum pump 1, A ventilation means for sending the blown air may be provided separately.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a sectional view of essential parts of the vacuum pump, Figure 2 is a side sectional view of the vacuum pump, Figure 3 is a plan view of the motor frame, Figure 4 is a plan view of the pump frame, and Figure 5 is the motor output. FIG. 6 is an enlarged view showing a connecting portion between a shaft and a rotating shaft of a pump, and FIG. 6 is a sectional view of a main part of a vacuum pump according to the prior art. In the figure 1... Vacuum pump (rotary pump) 2... Motor (drive means) 7... Rotating shaft 8... Output shaft 18... Ventilation passage A... Annular space (ventilation passage )

Claims (1)

[Scope of Claims] 1) In a non-lubricated rotary pump that is intermittently driven by a driving means, a pump that passes through the joint around the joint between the output shaft of the drive means and the rotating shaft of the rotary pump. A rotary pump characterized in that a ventilation passage is formed, and the pump is operated while blowing air to the joint portion through the ventilation passage.