JPH033994A - Vane pump - Google Patents

Abstract

PURPOSE:To prevent the seizure of the inner periphery of a cam ring and improve the seal property by opening a lubricant feed hole on the inner periphery of the cam ring, and forming a V-type lubricating groove inclined toward the center on part of the inner periphery of the cam ring in a compression segment. CONSTITUTION:As a rotary shaft 14 is rotated, a rotor 15 is concentrically rotated, and vanes 16 are moved in the radial direction as a support ring 17 eccentric to the rotary shaft 14 follows a cam ring inner periphery 12a. The volume of a pump chamber 18 partitioned by vanes 16 is expanded in an expansion segment 20, and the mixed gas is compressed and pressurized in a compression segment 21 and discharged to a discharge port 31b. A lubricant is guided to the center section of the cam ring inner periphery 12a by a V-type lubricating groove 12b formed on the cam ring inner periphery 12a in the compression segment 21. The center section of the cam ring inner periphery 12a is lubricated without hindrance to prevent seizure, and the seal property on the outer periphery can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vane pump suitable for supplying compressed air or sucking air.

<Prior Art> Such a vane pump includes a cam ring forming the inner circumferential surface of the cam ring, a suction port provided at the starting end of an expansion section, a discharge port provided at the end of the compression section, and a cam ring rotatably arranged within the cam ring. A rotor, a plurality of slits formed in the rotor in the radial direction at a plurality of angular positions, and a vane that is slidably fitted in the slit in the radial direction and comes into sliding contact with the inner peripheral surface of the cam ring. be.

In the vane pump, the temperature of the vane, cam ring, and rotor increases due to frictional resistance, causing seizure. To prevent this, in vane pumps that supply compressed air, the compressed air discharged from the discharge port is supplied to the space where the lubricating oil is stored, and the pressurized lubricating oil is poured into the sides of the vanes and the slits of the rotor. and is collected into the space through a discharge port that opens on the inner circumferential surface of the cam ring.

<Problems to be Solved by the Invention> The vane pump described above is prone to seizing on the inner circumferential surface of the cam ring, particularly at the center of the inner circumferential surface of the cam ring. This is because the lubricating oil that flows in from the side of the vane has difficulty reaching the center of the cam ring's inner circumferential surface.Also, the discharge port in the compression section and the suction port in the expansion section are provided at the center of the cam ring's inner circumferential surface. This is due to the fact that the lubricating oil that passes through is easily discharged.

<Means for solving the problem> A supply hole for supplying lubricating oil is opened on the inner peripheral surface of the cam ring,
A plurality of V-shaped lubrication grooves are formed in a part of the inner circumferential surface of the cam ring in the compression section so as to be inclined toward the center of the inner circumferential surface of the cam ring in the rotational direction of the rotor.

<Effect> As the rotor rotates, the vanes pop out in the radial direction.

The lubricating oil supplied from the supply hole to the inner circumferential surface of the cam ring is moved toward the discharge port of the compression section by the rotating vane. By forming a v-shaped lubricating groove on the cam ring inner circumferential surface in a part of the cam ring inner circumferential surface in the compression section, the lubricating oil flows along this lubricating groove toward the center of the cam ring inner circumferential surface. It is guided to the center of the inner circumferential surface of the cam ring, and lubrication of the center of the inner circumferential surface of the cam ring is performed.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 10 is a pump housing, and this pump housing 10 is composed of a cam ring 12 and an end cover 13, and the end cover 13 is integrally formed with the cam ring 12 sandwiched therebetween from both sides. A hollow chamber 11 is formed surrounded by the cam ring 12 and the end cover 13, and in the hollow chamber 11, a cam ring inner circumferential surface 12a is formed on the inner circumference of the cam ring 12.

A pump housing 10 is disposed inside the cam ring 12.
A rotor 15 shown in FIG. 2 is disposed in spline engagement with a rotating shaft 14 which is supported by a rotor.Slits 15a are formed in the rotor 5 in the radial direction at equal angular intervals. A vane 16 is fitted into each of the slits 15a so as to be slidable in the radial direction. Further, a support ring 17 whose axial center is eccentric with respect to the rotating shaft 14 is provided at both axial ends of the rotor 15, and an outer surface 17a of this support ring 17 can come into contact with an outer surface 16a of the vane 16.

A pump chamber 18 partitioned by vanes 16 is formed between the cam ring inner circumferential surface 12 a and the outer circumference of the rotor 15 . Following the rotation of the rotor 15, the volume of the pump chamber 18 increases along the inner peripheral surface 12a of the cam ring in the expansion section 2.
0 and is compressed in the compression section 21. The expansion section 20 shown in FIG. Each is connected to external equipment (not shown).

In the expansion section 20, the gas sucked from the expansion suction port 30a expands, and the pump chamber functions as a vacuum pump with a negative pressure throughout the day.

In the expansion section 20, the gas is further expanded, and then gas from the compression suction port 31a is sucked, and this gas is compressed in the compression section 21 and then discharged to the compression discharge port 31b.

Reference numeral 40 is a supply hole that is opened in the cam ring inner circumferential surface 12a and supplies lubricating oil. The lubricating oil is also supplied to the pipe line 41 in FIG.
42, and lubricates the cam ring inner circumferential surface 12a, the slit 15a10-ta 15, and the vane 16 in the pump housing 10.

The operation of the present invention will be explained based on the above configuration.

As the rotating shaft 14 rotates, the rotor 15 rotates concentrically. The vane 16 is moved in the radial direction along the inner peripheral surface 12a of the cam ring by a support ring 17 that is eccentric with respect to the rotating shaft 14. In the expansion section 20, the volume of the pump chamber 18 partitioned by the vane 16 is expanded. In the expansion section 20, gas is sucked from the compression suction port 31a and lubricating oil is sucked from the supply hole into the pump chamber 18, which has a negative pressure in the expansion section 20, and the mixed gas is compressed and pressurized in the compression section 21. The compressed air is compressed and discharged to the compression discharge bow 31b.

At this time, the cam ring inner peripheral surface 12a in the compression section 21
The lubricating oil is caused by the V-shaped lubricating groove 12b formed in the
It is guided to the center of the cam ring inner peripheral surface machining 2a. Therefore,
The central part of the cam ring inner peripheral surface 12a can be lubricated without any problem.
It can prevent burnout and improve the sealing performance of the outer periphery. At the same time, since the lubricating groove 12b is formed in the long compression section 21 that does not affect the volumetric efficiency of the pump, there is no problem with the performance of the pump.

<Effects of the Invention> As described above, the present invention has a supply hole in the inner circumferential surface of the cam ring and supplies lubricating oil from the supply hole to prevent seizure of the inner circumferential surface of the cam ring and improve sealing performance. It also improves.

In addition, by forming a plurality of V-shaped lubricating grooves that are inclined toward the center of the cam ring inner circumferential surface in the rotational direction of the rotor in a part of the cam ring inner circumferential surface in the compression section, the supplied lubricating oil is The cam ring is guided along the groove to the center of the cam ring's inner circumferential surface, thereby preventing burnout of the cam ring's inner circumferential surface due to lack of lubrication at the center of the cam ring's inner circumferential surface, and improving sealing performance.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the vane pump of the present invention, FIG. 2 is a cross-sectional view of the row of FIG. be. 12... Cam ring, 12a... Cam ring inner peripheral surface, 12b... Lubrication groove, 14... Rotating shaft, 15...
Rotor, 15a...Slit, 16...Vane, 1
7...Support ring, 18...Pump chamber, 20...
Expansion section, 21... Compression section, 30a... Expansion suction port, 31a... Compression suction port, 31b... Compression discharge port.

Claims (1)

[Claims] (1) A cam ring forming an inner circumferential surface of the cam ring, a suction port provided at the starting end of the expansion section, a discharge port provided at the terminal end of the compression section, a rotor rotatably disposed within the cam ring, and this rotor. A vane pump comprising a plurality of slits formed in the radial direction at a plurality of angular positions on the circumference, and a vane that is slidably fitted in the slit in the radial direction and comes into sliding contact with the inner peripheral surface of the cam ring. A supply hole for supplying the oil is opened in the inner peripheral surface of the cam ring, and a V-shaped lubricating groove is provided in a part of the inner peripheral surface of the cam ring in the compression section, and is inclined toward the center of the inner peripheral surface of the cam ring in the rotational direction of the rotor. A vane pump characterized by a plurality of vane pumps.