JPH09280183A - Vane pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase centrifugal force despite at the time of low temperature and a low speed, to improve pump performance. SOLUTION: A vane pump is equipped with a housing 10: wherein a suction port 11 and an exhaust port 12 are formed, a rotor 20: having plural vane guide grooves 21 provided in a circumferential direction at given intervals, and eccentrically fixed to a rotation spindle 30 in the housing 10, to be rotated, and vanes 40: inserted into the grooves 21, to suck and compress the space of the housing 10 while protruding from the grooves 21 during rotation; and gravity center weights 41 are formed so that the gravity centers of the vanes 40 can be moved to an outer side for increasing the centrifugal force of the vanes 40 at the time of low temperature and a low speed. Locking pieces 22 are formed on the end parts of the grooves 21 of the rotor 20, and separation preventive pieces 42 locked to the locking pieces 22 are formed on the end parts of the vanes 40 inserted into the grooves 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane pump having vanes, and more particularly to a vane pump which improves the performance of the vane by changing the center of gravity of the vanes.

[0002]

2. Description of the Related Art As shown in FIGS. 4 to 6, a conventional vane pump has a housing 10 'having an inlet 11' and an outlet 12 ', and a housing 10' at a predetermined circumferential interval.
The housing 1 is formed by forming four blade guide grooves 21 '.
A rotor 20 'eccentrically and rotatably fixed to a rotating shaft 30' in 0 ', and each blade guide groove 2 of the rotor 20'.
1 ', and a vane 40' for sucking and compressing the space of the housing 10 'while protruding from the vane guide groove 21' during rotation.

The operating principle of such a vane pump is that when the rotor 20 'is rotated clockwise by the rotating shaft 30', a centrifugal force is generated in each blade 40 'by the rotational force of the rotor 20', and the blade 40 'is rotated. 20 'due to the centrifugal force of
Each vane 40 'projects from the vane guide groove 21', and sliding friction is generated while the outer end of the vane 40 'contacts the inner peripheral surface of the housing 10'.

At this time, since the rotor 20 'is eccentrically installed by the rotating shaft 30', the blade 4 is rotated during rotation.
Space A of the housing 10 'divided by 0',
Since the suction force and the discharge force are generated while the volumes of B and C are repeatedly increased and decreased, the fluid is sucked through the suction port 11 ′ of the housing 10 ′ and discharged through the discharge port 12 ′.

[0005]

However, in the conventional vane pump, when the viscosity of the working fluid of the vane pump is high at low temperature (about 5 ° C. to 10 ° C.) and low speed, the viscosity of the vane plate 40 ′ is high. Since the centrifugal force is larger than the centrifugal force, the blade 40 'may not protrude from the blade guide groove 21' of the rotor 20 'and the blade 40' may not contact the inner peripheral surface of the housing 10 '. For this reason, since the spaces A, B, and C are not formed in the housing 10 ′, the fluid is not sucked in and discharged, and there is a problem that the function of the pump is not exerted.

[0006] Therefore, an object of the present invention is to provide a vane pump which can improve the performance of the pump by increasing the centrifugal force at low temperature and low speed.

[0007]

In order to achieve the above object, a vane pump according to the present invention comprises a housing having an inlet and an outlet, and a plurality of blade guide grooves provided at predetermined intervals in the circumferential direction. Having a rotor eccentrically installed on the rotating shaft in the housing, and inserted into the vane guide groove,
In a vane pump including a plurality of vanes that sucks and compresses a housing space while protruding from a vane guide groove during rotation, the vane center of gravity is set so as to increase centrifugal force of the vanes at low temperature and low speed rotation. A center of gravity moving to the outer end of the plate is provided.

[0008] Here, the rotor and the blade assembly means is a locking piece that symmetrically projects at the end of the blade guide groove of the rotor,
It projects symmetrically to the end of the blade guide groove that is inserted into the blade guide groove, reduces the friction area on the surface of the rotor blade guide groove of the rotor, and locks on the locking piece to separate from the blade guide groove. And a separation preventing piece for preventing

The center of gravity of the vane preferably has a curved surface formed on the outer peripheral surface of the housing so as to smoothly contact the inner peripheral surface of the housing. Further, the center of gravity of the vanes is projected to the outer peripheral surface of the rotor to reduce the diameter of the rotor and increase the efficiency of the pump.

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description,
The same reference numerals are used for the same elements, and duplicate description will be omitted.

1 to 3 show a vane pump according to an embodiment of the present invention, and FIG. 1 (a) is a plan view of the vane pump.
1 (b) is a vertical cross-sectional view of the vane pump, FIG. 2 is a perspective view of the rotor and the vanes assembled, and FIG. 3 is a perspective view of the vanes.

As shown in FIGS. 1 to 3, the vane pump includes a housing 10 having an inlet 11 and an outlet 12, and a plurality of blade guide grooves 21 circumferentially provided at predetermined intervals. Having a rotary shaft 30 in the housing 10
A rotor 20 that is eccentrically fixed and installed to rotate, and a blade 40 that is inserted into a blade guide groove 21 of the rotor 20 and that sucks and compresses the space of the housing 10 while protruding from the blade guide groove 21 during rotation. The center-of-gravity weight 41 is formed so as to move the center of gravity of the blade 40 to the outer end in order to increase the centrifugal force of the blade 40 at low temperature and low speed.

The assembly of the rotor 20 and the vanes 40 includes a locking piece 22 which symmetrically protrudes from the end of the vane guide groove 21 of the rotor 20 and a vane 40 which is inserted into the vane guide groove 21. Symmetrically protruding to the end portion, the friction area of the surface of the blade guide groove 21 of the rotor 20 is reduced, and the blade 40 is locked by the locking piece 22 to prevent the blade 40 from coming off the blade guide groove 21. It is composed of a separation prevention piece 42.

The center of gravity 41 of the vane 40 has a housing 1
Curved surface 4 on the outer surface so as to pivotally friction with the inner peripheral surface 13 of
1a is formed. The center-of-gravity weight 41 of the blade 40 is projected and assembled from the outer peripheral surface of the rotor 20.

When the working fluid is oil, the viscosity of the working fluid between the rotor 20 and the vanes 40 becomes high when the vane pump operates at low temperature and low speed. At this time,
When the clay exceeds the centrifugal force of the blade 40, the blade 40 does not protrude from the blade guide groove 21 of the rotor 20. In particular, such a phenomenon frequently occurs at low speed driving. The centrifugal force of the rotating rotating body is calculated by the following formula. F = mrw ² where F = centrifugal force, m = mass, r = rotation center distance, w
² = rotation speed. According to the above equation, when the rotation speed is constant, the centrifugal force is adjusted by changing the mass or the rotation center distance (the distance from the center of the rotor to the center of gravity of the blade).

Therefore, in order to overcome the problem that the blade 40 does not protrude from the blade guide groove in the initial driving state at low temperature and low speed, it is necessary to increase the centrifugal force. The center of gravity 41 is formed at the end to move the center of gravity of the blade 40 to the outside to increase the centrifugal force.

That is, the center of gravity 4 is provided on the outer peripheral portion of the rotor 20.
Since No. 1 is located, the vane 40 can easily project from the vane guide groove 21 against the fluid clay during the rotation of the rotor 20 at low temperature and low speed. In addition, rotor 2
0 of the vane guide groove 21 and the pivoting frictional force between the vane 40 and the vane 40 are reduced so that the vane 40 can easily protrude from the vane guide groove 21. The protrusion 42 is formed so as to contact the surface 23 of the blade guide groove 21 to reduce the friction area.

When the vane plate 40 is projected to the maximum by the centrifugal force and the centrifugal force is increased, the vane plate 40 comes into contact with the inner surface of the housing 10 and an excessive frictional force is generated by the compressive force. In order to prevent this, a separation preventing piece 42 is formed on the vane 40 and is engaged with the engaging piece 22 of the rotor 20, so that the housing 10 is prevented when the maximum centrifugal force is generated.
It is possible to reduce the frictional force between the inner peripheral surface 13 and the center of gravity 41 of the blade 40 to reduce the frictional force of the blade 40.

At this time, by forming the outer surface of the center of gravity 41 of the vane plate 40 into the curved surface 41a, the curved surface 41a smoothly contacts the inner peripheral surface 13 of the housing 10 and the inner peripheral surface 13 of the housing 10. The frictional force of the center of gravity 41 of the weight can be reduced.

The center of gravity 41 of the vane 40 is fixed to the rotor 20.
Since it projects from the rotor, the diameter of the rotor 20 is reduced by the size of the projected center of gravity 41, and the rotational inertia moment (M) of the rotor 20 is reduced. As a result, the driving energy of the pump is saved according to the following formula, and the efficiency of the pump can be increased. M = I _ZZ ∝ where I _ZZ = moment of inertia and ∝ = angular velocity.

The present invention is not limited to the above-mentioned embodiment, but can be variously modified. For example, in FIG. 1 to FIG. 4, the rotor 20 is provided with three blade guide grooves 21 and the blades 40 are inserted, but the number of blade guide grooves 21 and blades 40 may be increased or decreased according to the specifications of the vane pump. can do.

[0022]

As described above in detail, according to the vane pump of the present invention, the structure of the rotor and the vanes is improved so that the vanes are provided with weights to move the center of gravity of the vanes outward. The pump performance can be improved by increasing the centrifugal force even at low temperature and low speed.

[Brief description of drawings]

FIG. 1 is a plan view and a vertical sectional view showing a vane pump according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state of the rotor and the vanes of the vane pump according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a vane of the vane pump according to the embodiment of the present invention.

FIG. 4 is a plan view and a vertical sectional view showing a conventional vane pump.

FIG. 5 is a perspective view showing an assembled state of a rotor and vanes of a conventional vane pump.

FIG. 6 is a perspective view showing a vane of a conventional vane pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Suction port 12 ... Exhaust port 20 ... Rotor 21 ... Blade guide groove 22 ... Locking piece 30 ... Rotating shaft 40 ... Blade 41 ... Center of gravity 42 ... Separation prevention piece

Claims (4)

[Claims] 1. A housing having an intake port and an exhaust port, and a rotor having a plurality of blade guide grooves provided at predetermined intervals in a circumferential direction and eccentrically installed on a rotating shaft in the housing. A vane pump having a plurality of vanes that are inserted into the vane guide groove and that sucks and compresses the space of the housing while projecting from the vane guide groove during rotation, centrifuging the vane during low-temperature and low-speed rotation. A vane pump comprising a center of gravity for moving the center of gravity of the vane to the outer end of the vane so as to increase the force. 2. The rotor / blade assembly means includes locking pieces that symmetrically project at an end of the blade guide groove of the rotor, and the blade inserted into the blade guide groove. Prevention piece that symmetrically protrudes from the end of the blade, reduces the friction area of the surface of the blade guide groove of the rotor, and locks the locking piece to prevent separation from the blade guide groove. The vane pump according to claim 1, further comprising: 3. The weight center of gravity of the vane has a curved surface formed on an outer peripheral surface thereof so as to pivotally friction with an inner peripheral surface of the housing. Vane pump. 4. The pump according to claim 1, wherein the center of gravity of the vane is projected to the outer peripheral surface of the rotor to reduce the diameter of the rotor to increase the efficiency of the pump. Vane pump.