CN218644452U - Bearing bush - Google Patents

Abstract

The utility model relates to a bearing bush belongs to hydraulic pressure plunger pump application technology field, and it includes the bearing bush skin, the axle bush inlayer and connects the bearing bush skin and the axle bush intermediate level of axle bush inlayer. The utility model discloses to improving plunger pump mechanical efficiency, promote plunger pump variable dynamic response characteristic, reduce manufacturing accuracy, reduce variable mechanism manufacturing cost and prolong plunger pump life and have important meaning.

Description

Bearing bush

Technical Field

The utility model belongs to the technical field of hydraulic pressure plunger pump uses, especially, relate to a bearing bush.

Background

The variable plunger pump is the variable that realizes through the adjustment cradle angle, and the cradle is as variable plunger pump key spare part, and the oil absorption row is accomplished to support column cock pole on the one hand, and on the other hand cradle itself passes through the circular arc cooperation with the cradle seat, and the cradle seat adopts the fix with screw on the pump body, and the plunger pump realizes the discharge capacity change through changing the cradle angle, and the cradle structure is as shown in fig. 1, and the cradle seat structure is as shown in fig. 2.

As shown in fig. 3, the cradle and the cradle seat are matched through an arc surface, when the plunger pump is variable, the cradle can swing by a certain angle by taking an arc center as a fulcrum, the cradle seat is kept fixed, and at the moment, the cradle and the cradle seat form a friction pair with relative motion. Because the cradle has the effect of supporting the piston rod, during the hydraulic pump is told oil, the hydraulic pressure that high-pressure oil acted on the piston rod transmits the cradle holding surface, because of the reason of variable, the cradle itself need swing with the fulcrum of circular arc, and the hydraulic pressure that the piston rod was used in on the cradle terminal surface passes through the support circular arc and transmits to the cradle seat this moment, therefore cradle and cradle seat form one have relative rotational friction and loaded kinematic pair.

The total efficiency is a key index for measuring the performance of the plunger pump, the mechanical efficiency is an important factor influencing the total efficiency, a friction pair formed by the cradle and the cradle seat is used as a core part of the variable plunger pump, the contact friction force directly influences the mechanical efficiency of the plunger pump, and then the larger friction force not only influences the transmission efficiency, but also slows down the rotating speed of the cradle relative to the cradle seat and reduces the dynamic response speed of the variable plunger pump.

The piston rod is circular motion in the cradle plane, and hydraulic oil is used for piston rod terminal surface, and the drive piston rod compresses tightly the cradle surface, and cradle seat have relative loaded motion simultaneously, and this not only requires the cradle surface to have the wearability, and cradle circular arc department also need have wear-resisting characteristic. In the design of plunger pumps, the cradle typically requires heat treatment (gas nitriding) to increase cradle surface hardness and enhance wear resistance. The cradle and the cradle seat are matched through the arc surface, and the accuracy requirement of arc matching is correspondingly improved due to the improvement of the hardness of the cradle, so that once the arc matching is poor, the arc matching cannot be completely coincided, the high point of the arc surface of the cradle with high hardness can scratch the arc surface of the cradle seat, formed particles pollute the running environment of the plunger pump, and the service life of the plunger pump is greatly reduced.

In the design of the variable actuating mechanism of the existing plunger pump, how to reduce the friction force between a cradle and a cradle seat friction pair and improve the mechanical efficiency to increase the total efficiency of the plunger pump; how to reduce the friction force between the cradle and the cradle seat friction pair and improve the dynamic response characteristic of the variable mechanism; the problems that the contact arc surface of the cradle and the cradle seat is abraded and the service life of the plunger pump is shortened due to the fact that the hardness of the cradle is improved are solved; the problem of high manufacturing cost caused by the fact that the circular arc matching precision is improved and the circular arc surface abrasion is reduced is solved; these are all substantial problems that need to be solved in the field of plunger pump design.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the friction force between a cradle and a cradle seat of the conventional variable plunger pump is large, so that the problems of low mechanical efficiency of the plunger pump and slow dynamic response characteristic of the variable plunger pump are caused; the problem of high manufacturing cost caused by high-precision matching of the cradle and the arc surface of the cradle seat; and the high-hardness arc surface is matched to cause abrasion of the arc surfaces of the cradle and the cradle seat, and the service life of the plunger pump is short.

In order to achieve the above object, the technical scheme of the utility model provides a bearing bush, including the axle bush skin, axle bush inlayer and connection the axle bush skin with the axle bush intermediate level of axle bush inlayer.

Preferably, the bearing bush is of an arc structure, and a through hole is formed in the arc surface.

Preferably, the outer layer of the bearing bush is made of a low carbon steel plate.

Preferably, the surface of the outer layer of the bearing bush is plated with copper.

Preferably, the bearing liner inner layer is a POM plastic layer.

Preferably, the bearing bush intermediate layer is a copper powder sintered layer.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses because the excellent antifriction nature of POM material, wearability and the inherent plasticity of plastics material, excellent antifriction nature has not only effectively reduced the frictional force of cradle with the axle bush, improves mechanical efficiency, has improved plunger pump variable response characteristic moreover. When excellent plasticity makes the axle bush and the circular arc surface of cradle high rigidity cooperate, the POM material of tile axle inlayer can carry out self-adaptation plastic deformation according to the shape of cradle circular arc to better realization circular arc laminating obviously reduces the processing requirement of cradle and cradle seat circular arc surface, and manufacturing cost and the degree of difficulty are effectively controlled. The excellent wear resistance can effectively reduce the wear condition of the variable mechanism and prolong the service life of the plunger pump.

The utility model discloses to improving plunger pump mechanical efficiency, promote plunger pump variable dynamic response characteristic, reduce manufacturing accuracy, reduce variable mechanism manufacturing cost and prolong plunger pump life and have important meaning.

Drawings

FIG. 1 is a schematic view of a cradle configuration;

FIG. 2 is a schematic view of a cradle mount structure;

FIG. 3 is a schematic view of a cradle and cradle seat structure;

fig. 4 is a schematic structural view of a bearing bush provided by the present invention;

fig. 5 is a schematic view of a sectional structure of a bearing bush according to the present invention;

fig. 6 is a schematic structural diagram of the bearing bush installed between the cradle and the cradle seat.

Reference numerals: 1. an outer layer of the bearing bush; 2. a bearing bush intermediate layer; 3. an inner layer of the bearing bush; 4. a through hole; 5. an end face; 6. a convex arc; 7. a hole; 8. a concave circular arc; 9. a cradle; 10. a cradle mount; 11. a pin; 12. bearing bushes; 13. a screw; 14. a piston rod; 15. and a pump body.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

The embodiment of the utility model discloses axle bush installs between cradle 9 and cradle seat 10, for the circular arc structure, and be 3 layers of composite material structures, including the outer 1 of axle bush, axle bush intermediate level 2 and axle bush inlayer 3.

The outer layer 1 of the bearing bush is made of a low carbon steel plate, and the surface of the bearing bush is plated with copper. The low carbon steel plate of the bearing bush outer layer 1 is matched with the concave arc 8 of the cradle seat 10, the end face 5 of the cradle 9 bears the high pressure from the piston rod 14, the convex arc 6 of the cradle 9 bears certain load, and the bearing bush outer layer 1 is made of carbon steel and used for supporting the whole bearing bush 12 in order to guarantee the strength of the bearing bush 12. The main reasons for adopting low-carbon steel and plating copper on the surface are as follows: the low-carbon steel has better sinterability, can ensure that the carbon steel material and the middle sintered copper layer have good adhesive force, and the surface copper plating is more favorable for improving the sintering force.

The bush inlayer 3 is yellow POM plastic layer, bush inlayer 3 cooperates with cradle 9's protruding arc 6, POM is polyoxymethylene resin material, antifriction, wearability and plasticity are better, POM material cooperates with cradle 9 high rigidity's protruding arc 6, antifriction has reduced frictional resistance, the most important is that POM is as the peculiar plastics of plastics material and wearability, the effectual contact wear who reduces with cradle 9 high rigidity circular arc, has prolonged plunger pump's life.

The bearing bush intermediate layer 2 is a copper powder sintered layer, the bearing bush intermediate layer 2 of the bearing bush intermediate layer 2 mainly aims to bond the outermost low-carbon steel plate and the innermost POM plastic layer into a whole, so that sufficient bonding force is guaranteed, and the bearing bush 12 uses the copper powder sintered layer to realize connection and guarantee the bonding force of connection.

The arc surface of the bearing bush 12 is provided with a through hole 4 which is a pin hole of the bearing bush 12, and the bearing bush 12 is fixed on the cradle 10 through the through hole 4.

The utility model discloses install between cradle 9 and cradle seat 10, fix on cradle seat 10 through the pinhole on the arc surface, the POM plastic layer of axle bush inlayer 3 is laminated with cradle 9 circular arc mutually, because POM excellent antifriction nature of material, wearability and the inherent plasticity of plastics material, excellent antifriction nature has not only effectively reduced the frictional force of cradle 9 with axle bush 12, improves mechanical efficiency, has improved plunger pump variable response characteristic moreover.

When the bearing bush 12 is matched with the high-hardness arc surface of the cradle 9 due to excellent plasticity, the POM material of the inner layer of the bearing bush can be subjected to adaptive plastic deformation according to the shape of the arc of the cradle 9, so that arc fitting is better realized, the processing requirements on the arc surfaces of the cradle 9 and the cradle seat 10 are obviously reduced, and the manufacturing cost and difficulty are effectively controlled.

The excellent wear resistance can effectively reduce the wear condition of the variable mechanism and prolong the service life of the plunger pump.

Above is the preferred embodiment of the utility model, not limit according to this the utility model discloses a protection scope, the event: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present invention.

Claims (5)

1. A bearing shell, characterized in that: the bearing bush comprises a bearing bush outer layer (1), a bearing bush inner layer (3) and a bearing bush intermediate layer (2) which is used for connecting the bearing bush outer layer (1) and the bearing bush inner layer (3); the bearing bush intermediate layer (2) is a copper powder sintering layer.

2. A bearing shell according to claim 1, wherein: the bearing bush (12) is of an arc structure, and a through hole (4) is arranged on the arc surface.

3. A bearing shell according to claim 2, wherein: the outer layer (1) of the bearing bush is made of a low-carbon steel plate.

4. A bearing shell according to claim 3, wherein: and the surface of the outer layer (1) of the bearing bush is plated with copper.

5. A bearing shell according to claim 2, wherein: the bearing bush inner layer (3) is a POM plastic layer.

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