JP2592067Y2 - Vane type pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane type pump.

[0002]

2. Description of the Related Art An apparatus having a rotary shaft such as a compressor has a vane type oil pump formed by using the rotary shaft, and lubricating oil discharged from the oil pump is supplied to an axial line formed on the rotary shaft. 2. Description of the Related Art There has been conventionally known a structure configured to guide a fluid to a flow path extending in a direction and supply the fluid to a bearing portion through the flow path. In the vane type oil pump described above, conventionally, oil to be discharged is guided to a discharge chamber once formed outside the pump, and from the discharge chamber to a rotary shaft through a radial hole formed in the rotary shaft. It was guided to the formed axial flow path.

[0003]

The conventional vane type pump requires a member for forming a discharge chamber outside the pump, so that there is a problem that the number of members is large. The present invention has been made in view of the above problems, and is a vane type pump configured to guide a fluid to be discharged to an axially extending flow path formed on a rotating shaft, and a conventional product. It is an object of the present invention to provide a pump having a smaller number of parts than that of a pump.

[0004]

According to the present invention, a casing having a cylindrical side wall and a pair of end walls for sealing both ends of the side wall, and the end wall of the casing are rotatable. And a rotating shaft extending coaxially with the casing, eccentrically fixed to the rotating shaft, one end of which abuts one end wall of the casing via an oil film, and the other end wall of the casing contacts the other end wall. Ends contact through an oil film,
A part of the peripheral wall is provided with a rotor that is in line contact with the side wall of the casing via an oil film, and a sliding blade that is constantly pressed against the rotor via an oil film.
When viewed in the rotation direction of the rotor, a pressurizing chamber is formed in front of a line contact portion between the peripheral wall of the rotor and the side wall of the casing, and a suction chamber is formed in the rear, and a flow path extending in the axial direction is formed in the rotation shaft. A suction port communicating with the suction chamber is formed in the casing in the vicinity of the sliding blade and in front of the sliding blade when viewed in the rotation direction of the rotor. In the vicinity of the line contact portion with the side wall, and in front of the line contact portion when viewed in the rotation direction of the rotor, a vane type pump having a discharge port formed from a peripheral wall of the rotor to a flow path formed on the rotation shaft is formed. provide. In a preferred aspect of the present invention, a cutout groove is formed on a peripheral wall of the rotor so as to extend forward from a discharge port in a rotation direction of the rotor.

[0005]

In the present invention, the fluid in the pressurized chamber is formed on the rotary shaft through the discharge port formed on the rotor and the rotary shaft without discharging to the outside of the casing forming the pump. Flows into the flow path. Therefore, it is not necessary to dispose the second casing for forming the discharge chamber outside the casing forming the pump. By forming a notch groove extending from the discharge port to the front in the rotation direction of the rotor on the peripheral wall of the rotor, the cross-sectional area of the flow path from the pressurizing chamber to the discharge port increases, and the drive due to excessive pressure increase of the fluid in the pressurizing chamber An increase in force, a decrease in volumetric efficiency of the pump, and the like are prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vane type pump according to a first embodiment of the present invention will be described with reference to FIGS. Cylindrical side wall 1
And a pair of end walls 2 and 3 sealing both ends of the side wall 1,
A casing 4 is formed. The casing 4 is fixed to internal parts A such as a compressor using bolts B. A rotating shaft of a compressor or the like, and thus a rotating shaft 5 of the pump, penetrates the end walls 2 and 3 of the casing and extends coaxially with the casing 4. A cylindrical rotor 6 is accommodated in the casing 4. The rotor 6 is eccentrically fixed to the rotating shaft 5. The rotor 6 has one end in contact with the end wall 2 of the casing via an oil film, the other end in contact with the end wall 3 of the casing via an oil film, and a part of the peripheral wall with the side wall 1 of the casing. There is line contact through the oil film. A sealing surface is formed by the contact portion and the contact portion. A spring 7 is housed in a hole 1a formed in the side wall 1 of the casing.
The sliding blades, i.e., the vanes 8, which are urged by the above, are always in pressure contact with the peripheral wall of the rotor 6 via an oil film. Rotor 6
When viewed in the direction of rotation of the rotor 6 indicated by the arrow, the pressurizing chamber 4a is formed in front of the line contact portion between the peripheral wall of the rotor 6 and the side wall 1 of the casing, and the suction chamber 4b is formed rearward. Each is formed. A flow path 9 extending in the axial direction is formed in the rotating shaft 5. A suction port 10 communicating with the suction chamber 4b is formed in the casing 4 and the internal part A near the vane 8 and in front of the vane 8 when viewed in the rotation direction of the rotor 6. The rotor 6 and the rotating shaft 5 are connected to the rotating shaft 5 from the peripheral wall of the rotor 6 near the line contacting portion 6a with the side wall 1 of the casing and in front of the line contacting portion 6a when viewed in the rotating direction of the rotor 6. A discharge port 11 reaching the formed flow path 9 is formed. The vane type pump having the above configuration is disposed in a state where the end of the suction port 10 is immersed in an oil reservoir 12 such as a compressor.

In the vane type pump, as shown in FIG. 3, the suction step and the discharge step are started at the same time when the line contact portion 6a of the rotor passes through the suction port 10. That is, the flow of oil into the suction chamber 4b through the suction port 10 is started, and the pressurization of oil in the pressurization chamber 4a and the discharge of oil from the pressurization chamber 4a through the discharge port 11 are started. You. As the rotor 6 rotates in the direction of the arrow, the volume of the suction chamber 4b increases as shown in FIG.
Oil flow into the interior continues. On the other hand, the volume of the pressurizing chamber 4a decreases, and the oil in the pressurizing chamber 4a is pressurized. The pressurized oil flows from the pressurizing chamber 4a to the discharge port 11 formed in the rotor 6 and the rotating shaft 5. Then, the oil flows into an oil supply passage 9 formed in the rotating shaft 5 and is supplied to a bearing portion such as a compressor through the oil supply passage 9. As the rotor 6 further rotates in the direction of the arrow, as shown in FIG.
The volume of the suction chamber 4b further increases, and the volume of the pressurizing chamber 4a further decreases. The discharge process ends when the discharge port 11 reaches a position facing the vane 8. Discharge port 11 is vane 8
The line contact portion 6a of the rotor is
The discharge port 11 communicates with the suction chamber 4b while the rotor 6 rotates in the direction indicated by the arrow to a position where it passes. However, the suction port 10 is formed in the vicinity of the vane 8 and in front of the vane 8 when viewed in the rotation direction of the rotor 6, and the discharge port 11 is formed in the vicinity of the line contact portion 6a with the side wall 1 of the casing. 6
Is formed in front of the line contact portion 6a when viewed in the rotational direction, and the time when the discharge port 11 communicates with the suction chamber 4b is extremely short. Therefore, the discharge port 1 is formed from the flow path 9 formed in the rotating shaft 5.
There is no danger that the oil will flow back into the suction chamber 4b through the suction chamber 1b.

As can be seen from the above description, in the vane type pump, the oil in the pressurizing chamber 4a is formed on the rotor 6 and the rotating shaft 5 without being discharged to the outside of the casing 4 forming the pump. Through the outlet 11
It flows into a flow path 9 formed in the rotating shaft 5. Therefore, it is not necessary to dispose the second casing for forming the discharge chamber outside the casing 4 forming the pump. As a result, the number of parts is reduced as compared with the conventional product.

A second embodiment of the present invention is shown in FIGS. In the second embodiment, a cutout groove 6b is formed in the peripheral wall of the rotor 6 so as to extend forward from the discharge port 11 in the rotation direction of the rotor 6. The notch groove 6b is orthogonal to the discharge port 11, and its cross-sectional area increases toward the discharge port 11. Second
According to the embodiment, since the cross-sectional area of the flow path from the pressurizing chamber 4a to the discharge port 11 is large, the oil flows from the pressurizing chamber 4a to the discharge port 11 smoothly. Further, since the cross-sectional area of the notch groove 6b and, consequently, the cross-sectional area of the flow path from the pressurizing chamber 4a to the discharge port 11 increases toward the discharge port 11, the oil pressure on the discharge port 11 side increases on the flow path inlet side. , And the inflow of oil into the discharge port 11 is promoted.
This prevents an increase in driving force due to an excessive increase in the pressure of the fluid in the pressurizing chamber 4a, a failure in pressing the vane 8 due to an increase in the pressure in the pressurizing chamber 4a, a reduction in pump volumetric efficiency, and the like.

[0010]

As described above, in the present invention, the fluid in the pressurized chamber passes through the discharge port formed in the rotor and the rotating shaft without being discharged to the outside of the casing forming the pump. It flows into the flow path formed on the rotating shaft. Therefore, there is no need to dispose the second casing for forming the discharge chamber outside the casing for forming the pump.
The number of parts can be reduced. By forming a notch groove extending from the discharge port to the front in the rotation direction of the rotor on the peripheral wall of the rotor, the cross-sectional area of the flow path from the pressurizing chamber to the discharge port increases, and the drive due to excessive pressure increase of the fluid in the pressurizing chamber An increase in force, a decrease in volumetric efficiency of the pump, and the like are prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vane type pump according to a first embodiment of the present invention.

FIG. 2 shows a state in the middle of inhalation and in the middle of discharge in FIG.
It is an II arrow line view.

FIG. 3 shows the state at the start of inhalation and the start of discharge in II of FIG.
FIG.

FIG. 4 shows the state at the end of inhalation and at the end of discharge, II in FIG.
FIG.

FIG. 5 is a view corresponding to FIG. 2 of a vane type pump according to a second embodiment of the present invention.

FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side wall of casing 1a Hole 2, 3 End wall of casing 4 Casing 4a Pressurizing chamber 4b Suction chamber 5 Rotating shaft 6 Rotor 6a Line contact portion 6b Notch groove 7 Spring 8 Vane 9 Flow path 10 Suction port 11 Discharge port 12 Oil reservoir

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-50-144110 (JP, A) JP-A-53-97708 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 2/356 F04C 15/00 F04C 18/356

Claims (3)

(57) [Scope of request for utility model registration] 1. A casing having a cylindrical side wall and a pair of end walls for sealing both ends of the side wall, a rotating shaft extending coaxially with the casing through a rotatable end wall of the casing, and a rotating shaft. The casing is eccentrically fixed, one end of the casing abuts on one end wall via an oil film, the other end abuts on the other end wall of the casing via an oil film, and a part of the peripheral wall is a casing. A rotor that is in line contact with the side wall of the rotor via an oil film, and sliding blades that are constantly in pressure contact with the rotor via the oil film. A pressurizing chamber is formed in front of a line contact portion between the shaft and the side wall of the casing, and a suction chamber is formed in the rear, and a flow path extending in the axial direction is formed in the rotating shaft. Sliding wings in the vicinity and in the direction of rotor rotation A suction port communicating with the suction chamber is formed in front of the root, and the rotor and the rotating shaft are in the vicinity of the line contact portion with the side wall of the casing and in front of the line contact portion when viewed in the rotation direction of the rotor. And a vane type pump having a discharge port extending from a peripheral wall of a rotor to a flow path formed on a rotating shaft. 2. The vane type pump according to claim 1, wherein a cutout groove extending forward from the discharge port in the rotation direction of the rotor is formed in a peripheral wall of the rotor. 3. The vane type pump according to claim 2, wherein a cross-sectional area of the notch groove increases toward a discharge port.