JPH0653786U - Vane type pump - Google Patents

Abstract

(57) [Summary] [Object] To provide a vane type pump having a smaller number of parts as compared with a conventional product, which is configured to guide a discharge fluid to a flow path formed in a rotary shaft and extending in an axial direction. A casing having a cylindrical side wall and a pair of end walls sealing both ends of the side wall, and a rotary shaft that rotatably penetrates through the end wall of the casing and extends coaxially with the casing.
It is eccentrically fixed to the rotating shaft, and one end of the casing comes into contact with one end wall through the oil film, and the other end comes into contact with the other end wall of the casing through the oil film. A rotor in line contact with the side wall of the casing through an oil film,
The rotor is provided with a sliding blade that is constantly in pressure contact with the oil film,
A suction port communicating with the suction chamber is formed in the casing in the vicinity of the sliding blades and in front of the sliding blades when viewed in the rotation direction of the rotor,
In the vicinity of the line contact portion with the side wall of the casing, a discharge port reaching from the peripheral wall of the rotor to the flow path formed in the rotary shaft is formed in front of the line contact portion between the rotor and the rotary shaft in the vicinity of the line contact portion with the side wall of the casing. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vane type pump.

[0002]

[Prior art]

 A device with a rotary shaft, such as a compressor, has a vane type oil pump formed using the rotary shaft, and the lubricating oil discharged from the oil pump extends in the axial direction formed on the rotary shaft. There is conventionally known a device configured so as to be guided to a flow channel for supplying and to be supplied to the bearing portion through the flow channel. In the above-mentioned vane type oil pump, conventionally, the oil to be discharged is guided to a discharge chamber once formed outside the pump, and from the discharge chamber, through a radial hole formed in the rotary shaft, the rotary shaft is rotated. It was led to the flow path formed in the axial direction.

[0003]

[Problems to be solved by the device]

 The conventional vane type pump has a problem that the number of members is large because it requires a member for forming a discharge chamber outside the pump. 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 rotary shaft. The objective is to provide a pump with a smaller number of parts than the pump.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, a casing having a cylindrical side wall and a pair of end walls sealing both ends of the side wall, and a casing rotatably extending through the end wall of the casing and extending coaxially with the casing. It is eccentrically fixed to the existing rotating shaft, and one end of the casing abuts against one end wall of the casing via an oil film, and the other end wall of the casing receives the other end of the casing via an oil film. The rotor, which is in contact with and has a part of the peripheral wall in line contact with the side wall of the casing through the oil film, and the sliding blade, which is constantly in pressure contact with the rotor through the oil film, are provided. Viewed in the direction of rotation of the rotor, a pressure chamber is formed in front of the line contact part between the peripheral wall of the rotor and the side wall of the casing, and a suction chamber is formed in the rear of the line contact part. Is formed, and the casing is In addition, an intake port communicating with the intake chamber is formed in front of the sliding vanes when viewed in the rotation direction of the rotor, and the rotor and the rotation shaft are near the line contact portion with the side wall of the casing, and Provided is a vane type pump in which a discharge port reaching from a peripheral wall of a rotor to a flow passage formed in a rotation shaft is formed in front of a line contact portion when viewed in a rotation direction of a rotor. In a preferred aspect of the present invention, a cutout groove extending from the discharge port to the front side in the rotation direction of the rotor is formed on the peripheral wall of the rotor.

[0005]

[Action]

 In the present invention, the fluid in the pressurizing chamber does not discharge to the outside of the casing that forms the pump, but flows through the discharge port formed in the rotor and the rotary shaft and forms in the rotary shaft. Flow into the road. 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 on the peripheral wall of the rotor that extends forward from the discharge port in the rotational direction of the rotor, the cross-sectional area of the flow path from the pressurization chamber to the discharge port increases, and the pressure force of the fluid in the pressure chamber rises excessively. It is possible to prevent an increase in driving force and a decrease in volumetric efficiency of the pump.

[0006]

【Example】

 A vane type pump according to a first embodiment of the present invention will be described with reference to FIGS. A casing 4 is formed by a cylindrical side wall 1 and a pair of end walls 2 and 3 that seal both ends of the side wall 1. The casing 4 is fixed to an internal part A such as a compressor with a bolt B. A rotary shaft of a compressor or the like, and further a rotary shaft 5 of a pump, penetrates the end walls 2 and 3 of the casing and extends coaxially with the casing 4. A cylindrical rotor 6 is housed in the casing 4. The rotor 6 is eccentrically fixed to the rotating shaft 5. One end of the rotor 6 contacts the end wall 2 of the casing via the oil film, the other end contacts the end wall 3 of the casing via the oil film, and a part of the peripheral wall contacts the side wall 1 of the casing. Line contact is made through the oil film. A sealing surface is formed by the contact portion and the contact portion. Sliding blades, that is, vanes 8 housed in a hole 1a formed in the side wall 1 of the casing and urged by a spring 7, are constantly in pressure contact with the peripheral wall of the rotor 6 via an oil film. By the rotor 6, the casing 4, and the vanes 8, when viewed in the rotation direction of the rotor 6 indicated by the arrow, the pressurizing chamber 4a is located 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 is located rearward. 4b are formed respectively. A channel 9 extending in the axial direction is formed in the rotary shaft 5. In the casing 4 and the internal part A, an intake port 10 communicating with the intake chamber 4b 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. The rotor 6 and the rotating shaft 5 are connected to the rotating shaft 5 from the peripheral wall of the rotor 6 in the vicinity of the line contact portion 6a with the side wall 1 of the casing and in front of the line contact portion 6a when viewed in the rotation direction of the rotor 6. A discharge port 11 that reaches the formed flow path 9 is formed. The vane type pump having the above structure is arranged with the end portion of the suction port 10 immersed in the oil reservoir 12 such as a compressor.

In the vane type pump of the present invention, as shown in FIG. 3, the suction process and the discharge process are started at the same time when the line contact portion 6 a of the rotor passes through the suction port 10. That is, the flow of oil into the suction chamber 4b via the suction port 10 is started, and the pressurization of the oil in the pressure chamber 4a and the discharge of the oil from the pressure chamber 4a via the discharge port 11 are started. Is started. As the rotor 6 rotates in the direction of the arrow, as shown in FIG. 2, the volume of the suction chamber 4b increases and the oil continues to flow into the suction chamber 4b. On the other hand, the volume of the pressurizing chamber 4a is reduced and the oil in the pressurizing chamber 4a is pressurized, and the pressurized oil is discharged from the pressurizing chamber 4a to the discharge port 11 formed in the rotor 6 and the rotary shaft 5. The oil flows into the oil supply passage 9 formed in the rotary shaft 5 and is supplied to the bearing portion such as the compressor through the oil supply passage 9. As the rotor 6 further rotates in the direction of the arrow, the volume of the suction chamber 4b further increases and the volume of the pressurizing chamber 4a further decreases, as shown in FIG. The discharge process ends when the discharge port 11 reaches a position facing the vane 8. The discharge port 11 communicates with the suction chamber 4b while the rotor 6 rotates in the arrow direction from the position where the discharge port 11 faces the vane 8 to the position where the line contact portion 6a of the rotor passes through the suction port 10. However, the suction port 10 is formed in the vicinity of the vane 8 and in front of the vane 8 as viewed in the rotation direction of the rotor 6, and the discharge port 11 is in the vicinity of the line contact portion 6a with the side wall 1 of the casing, and Since it is formed in front of the line contact portion 6a when viewed in the rotation direction of the rotor 6, the time for the discharge port 11 to communicate with the suction chamber 4b is extremely short. Therefore, there is no possibility that oil will flow back into the suction chamber 4b from the flow passage 9 formed in the rotary shaft 5 through the discharge port 11.

As can be seen from the above description, in this vane type pump, the oil in the pressurizing chamber 4a is formed on the rotor 6 and the rotary shaft 5 without being discharged to the outside of the casing 4 forming the pump. It passes through the discharge port 11 and flows into the flow channel 9 formed in the rotary 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 compared to conventional products.

A second embodiment of the present invention is shown in FIGS. In the second embodiment, a cutout groove 6b is formed on 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. According to the second embodiment, since the cross-sectional area of the flow path from the pressurizing chamber 4a to the discharge port 11 is large, the flow of oil from the pressurizing chamber 4a to the discharge port 11 becomes smooth. Further, since the cross-sectional area of the cutout 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. The pressure becomes negative with respect to the oil pressure on the side, and the inflow of oil into the discharge port 11 is promoted. As a result, it is possible to prevent an increase in driving force due to an excessive rise in the pressure of the fluid in the pressurizing chamber 4a, a poor pressure contact of the vane 8 due to an increase in the pressure inside the pressurizing chamber 4a, and a decrease in the volumetric efficiency of the pump.

[0010]

【effect】

 As described above, in the present invention, the fluid in the pressurizing chamber does not discharge to the outside of the casing that forms the pump, but passes through the discharge port formed in the rotor and the rotary shaft and passes through the rotary shaft. Flows into the flow path formed in. Therefore, it is not necessary to dispose the second casing for forming the discharge chamber outside the casing forming the pump, and the number of parts can be reduced. By forming a notch groove on the peripheral wall of the rotor that extends forward from the discharge port in the rotational direction of the rotor, the cross-sectional area of the flow path from the pressurization chamber to the discharge port increases, and the pressure force of the fluid in the pressure chamber rises excessively. It is possible to prevent an increase in driving force and a decrease in volumetric efficiency of the pump.

[Brief description of drawings]

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

FIG. 2 II- of FIG. 1 showing a state during inhalation and during ejection
It is a II arrow line view.

FIG. 3 II of FIG. 1 showing a state at the start of inhalation and at the start of ejection
-II is a view on arrow.

4 is a II of FIG. 1 showing a state at the end of inhalation and at the end of ejection.
-II is a view on arrow.

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

6 is a VI-VI arrow view of FIG.

[Explanation of symbols]

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

Claims (3)

[Scope of utility model registration request] 1. A casing having a cylindrical side wall and a pair of end walls sealing both ends of the side wall, a rotary shaft rotatably penetrating the end wall of the casing and extending coaxially with the casing, and a rotary shaft. Is eccentrically fixed to one end wall of the casing with one end abutting the oil film, the other end wall of the casing abutting the other end with the oil film, and a part of the peripheral wall of the casing. A rotor that is in line contact with the side wall of the rotor through an oil film, and a sliding blade that is in constant pressure contact with the rotor through the oil film. A pressure chamber is formed in the front of the line contact portion between the side wall of the casing and the side wall of the casing, and a suction chamber is formed in the rear of the line contact portion, a flow path extending in the axial direction is formed on the rotating shaft, and the casing has sliding vanes. Sliding blades near and in the direction of rotation of the rotor A suction port communicating with the suction chamber is formed in front of the root, and in the rotor and the rotation shaft, 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. A vane type pump in which a discharge port is formed from a peripheral wall of a rotor to a flow passage formed on a rotary shaft. 2. The vane type pump according to claim 1, wherein a cutout groove extending from the discharge port to the front in the rotation direction of the rotor is formed on the peripheral wall of the rotor. 3. The vane type pump according to claim 2, wherein the notch groove has a cross-sectional area increasing toward a discharge port.