JP2629261B2 - Vane pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vane pump, and more particularly to a vane pump having a roller type vane.

2. Description of the Related Art In a conventional vane pump of this type, a metal-based vane pump is selected as a material for a roller type vane. This is because the vane of this kind of vane pump has a configuration in which the vane projects by centrifugal force, so that the specific gravity of the vane is required to a certain degree or more, and the vane processing that requires high precision is relatively easy. It was because.

Problems to be Solved by the Invention A vane pump using a vane made of a metal-based material as described above can ensure close contact with a cam surface on which the vane slides, and also has a good vane end face accuracy, so that the volumetric efficiency of the pump is easy. Sliding noise generated between a vane made of a metal material and a cam surface made of a similar hard material, and the vane collides with the cam surface. There is a problem that the sound is loud, and particularly the sound of a high frequency component that is unpleasant. Further, when this kind of vane pump is used with a fluid having a low lubricating property, there is a problem that the vane or cam surface wear is increased due to poor self-lubricating property of the vane or cam surface.

In addition, when a material having excellent lubricity is used for the vane, this kind of material is often made of resin and has a low specific gravity, and has a disadvantage that the centrifugal force of the vane is insufficient and the pump operation cannot be performed satisfactorily. Was. An object of the present invention is to solve such a conventional problem and to provide a vane pump having low noise and excellent wear resistance.

Means for Solving the Problems In order to solve the above problems, the vane pump of the present invention uses a vane formed of a material having excellent sound-absorbing properties and abrasion resistance, and an inner periphery formed at a predetermined distance from an inner peripheral surface of the cylinder. It has a multi-layer structure with pins made of a material having a high specific gravity inserted in the plane.

As described above, since the vane pump of the present invention is configured, the sound of collision or sliding between the vane and the cam surface is particularly high in noise level due to the material having excellent silencing properties and excellent wear resistance constituting the outer layer of the vane. Frequency components are greatly reduced. Also, there is a predetermined interval between the outer layer and the inner layer of the vane,
Since the fluid is filled here, a viscous damper due to the viscosity of the fluid is formed, so that the vibration of the vane outer layer and the vane inner layer is suppressed, and the noise level of the pump can be further reduced.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a pump case, the inner surface of which is constituted by a pump space 2 formed in a cylindrical shape, a cylindrical space 3 adjacent to the pump space 2, and a step 1 a provided on an opening surface of the pump space 2. The pump body
An oil seal 4 is inserted in the gap 3 having a cylindrical shape 2a, and an O-ring 5 is inserted in the step 1a. Pump lid 6 is screw 7
The pump space 2 is fixed to the pump case 1 via the O-ring 5 at the end face 6a, and has a hollow 8 formed in a cylindrical shape from the end face 6a.
And the packing 10 are inserted in close contact with each other.
The lid sliding plate 9 and the packing 10 have suction ports 11a, 11b and discharge ports 12a, 12b, respectively, which communicate with a suction port 13 and a discharge port 14 provided in the pump lid 6, respectively. The other end of the pump case 1 forms a flange 16 connected to a pump driving motor 15. The pump body 2a inserted into the pump space 2 is configured as follows.
A cylindrical cam surface 17 and a flat portion 18 for sealing one end of the cam surface 17
Further, a rotor case 20 formed of a resin having a cam surface 17 and a bearing 19 which is eccentric by a predetermined amount and which is opened in the flat portion 18 is provided with a convex portion 21 formed on the outer peripheral surface of the rotor case 20 in a concave portion 22 provided in the pump space 2. Insert so that it fits in. Here, since the rotor case 20 and the pump space 2 have a slight gap, they can be easily inserted. The roller 23 includes a rotating body 26 having a groove 25 for slidably holding the cylindrical vane 24, and a main shaft 27 formed coaxially and integrally with the rotating body 26 and holding the rotating body 26 in a cantilever manner. , And is rotatably held by a bearing 19 of the rotor case 20. A groove 29 is formed in the end portion 28 of the main shaft 27 on the motor 15 side, and a groove 31 is formed in the output shaft 30 of the motor 15.
By inserting the pins 33a and 33b provided on the shaft coupling 32, the torque of the motor 15 is transmitted to the pump. Shaft coupling 32 and main shaft 27, output shaft 30 and pins 33a and 33b and groove 29, groove 3
1 is provided with the required clearance so that the alignment of the shaft system can be corrected. In the pump according to the present configuration, since the coaxiality of the pump-side main shaft 27 and the output shaft 30 of the motor 15 is hard to be obtained, such a somewhat flexible shaft coupling is desirable.

A hole 34 is formed substantially coaxially in the cylindrical vane 24 to form an outer layer 24a.A pin 35 is slidably inserted into the hole 34 at a small interval 24c in the radial direction and an inner layer 24b is formed.
Is composed. The material of the cylindrical vane 24 is required to be excellent in abrasion resistance and sound deadening property, and it is desirable to select a sintered alloy containing a fixed lubricant or a resin material containing PTFE. It is necessary that the pin 35 be made of a material having a higher specific gravity than the cylindrical vane 24.
A pin 35 is inserted into the cylindrical vane 24 with a slight clearance. The smooth movement of the cylindrical vane 24 may be hindered by pressure fluctuations or sliding resistance in the pump, and the collision sound between the cylindrical vane 24 and the sliding surface generated at this time may be caused by the noise of this type of pump. Accounts for most of the Since the cylindrical vane 24 is hollow, the mass is sufficiently small, the force at the time of collision between the cylindrical vane 24 and the sliding surface is sufficiently small, and the cylindrical vane 24 and the pin 35 are slightly Since it is inserted with a clearance, a damping action by viscous resistance of the fluid acts between the two. In addition, since this damping action also acts on the axial vibration of the cylindrical vane 24, the collision sound or vibration of the cylindrical vane 24 is reduced as compared with the case where the cylindrical vane 24 is integrally formed. High suppression effect. Furthermore, in the vane pump having this configuration, the chamfering of the shoulder 24d of the cylindrical vane 24 has a large effect on pump performance. This is because the effective side clearance of the vane 24 is greatly reduced by chamfering. However, this chamfer was essential to prevent the vane 24 from prying and to not increase the pump torque. According to this pump configuration, by selecting a soft material such as a resin material containing an ethylene tetrafluoride resin for the cylindrical vane 24, the adaptation of the chamfered portion is greatly improved. The chamfering of the part 24d can be minimized.

FIG. 5 shows another embodiment of the present invention. In this embodiment, grease 3 is applied to the space 24c between the vane 24 and the pin 35.
Since b is filled, the effect of suppressing the vibration of the vane 24 and the pin 35 can be improved, and the lubricating effect on the end face of the vane 24 having large friction can be expected.

Effects of the Invention As described above, according to the vane pump of the present invention, the vane has a double structure, and the outer layer is made of a material having good slidability and excellent noise reduction properties. The following effects can be obtained by providing the above gap.

(1) Compared to the case of using a conventional metal vane,
The noise level of the pump can be significantly reduced due to the sound deadening effect of the outer vane layer and the damping effect of the fluid filled in the gap between the outer vane layer and the inner layer.

(2) By selecting a soft material having excellent slidability as the outer layer of the vane, the chamfer of the vane shoulder can be minimized, so that the volumetric efficiency of the pump can be increased. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a vane pump according to an embodiment of the present invention, FIG. 2 is a schematic sectional view of a main part of the pump cut at a position rotated by 90 degrees, and FIG. 4a is a front view of the vane, FIG. 4b
Is a cross-sectional view of the same, and FIG. 5 is a front view of a vane according to another embodiment. 23 ... rotor, 25 ... groove, 24 ... vane, 24a ... outer layer, 24b ... inner layer, 24c ... interval, 36 ... grease.

Claims (3)

(57) [Claims] A rotor, and a columnar vane slidably inserted into a groove provided in the rotor. The columnar vane is separated into two masses, an outer layer and an inner layer. A vane pump made of a material having excellent sound deadening properties and abrasion resistance, and having a required space between the outer layer and the inner layer. 2. The vane pump according to claim 1, wherein the material of the outer layer of the columnar vane is a resin material containing tetrafluoroethylene resin. 3. The vane pump according to claim 1, wherein a required space between an outer layer and an inner layer of the cylindrical vane is filled with soft grease.