WO2016107399A1

WO2016107399A1 - Air compressor crankshaft

Info

Publication number: WO2016107399A1
Application number: PCT/CN2015/097280
Authority: WO
Inventors: 耿爱农; 陈威龙; 阮勤江; 陈君立
Original assignee: 浙江鸿友压缩机制造有限公司
Priority date: 2014-12-31
Filing date: 2015-12-14
Publication date: 2016-07-07

Abstract

An air compressor crankshaft is an assembled crankshaft and comprises an eccentric shaft neck (1), a crank arm (2) connected to the eccentric shaft neck (1), and a balance block (3) connected to the crank arm (2) and/or the eccentric shaft neck (1). The crank arm (2) and the balance block (3) are each formed by a plurality of flat-sheet-shaped parts in an overlaying assembly manner. A manufacturing process of the air compressor crankshaft is that the flat-sheet-shaped parts are prefabricated and then are mutually fastened into a whole in a rivet connection manner, a bolt connection manner, a flanging folding buckle connection manner and the like. Because the flat-sheet-shaped parts can be manufactured in a punching manner, the production costs of the crankshaft are lower; in addition, the sheet-shaped parts are used for constituting the balance block in an overlaying manner, the mass and the location of the center of mass of the balance block can be adjusted by increasing or decreasing the number of sheets or by adjusting the mounting position according to different compressor products, and therefore more adaptability is achieved.

Description

Air compressor crankshaft

Technical field

The invention belongs to the technical field of compressors and relates to a crankshaft structure of an air compressor.

Background technique

The existing reciprocating air compressors all need a crankshaft to drive the piston to drive the piston, and finally convert the rotary motion of the motor into the reciprocating motion of the piston, thereby realizing the compression of the air working medium.

At present, the crankshaft of the reciprocating air compressor includes a journal, a crank pin, a crank arm, a balance block and the like, and the manufacturing process is often to integrally design and manufacture the above components, or to integrally design and manufacture the balance block including the eccentric hole. After that, it is fastened to the journal. The above-mentioned crankshaft structure is collectively referred to as an integral crankshaft, and machining is required to ensure dimensional accuracy and shape tolerance.

However, the above-mentioned conventional air compressor integrated crankshaft structure still has some improvements, mainly in: 1) it has an eccentric journal or an eccentric crank pin or an eccentric weight eccentric hole, traditional machining Such as turning and grinding are difficult, it is easy to cause product quality stability and consistency is difficult to control; 2) Another overall crankshaft can only be adapted to a single model of compressor after design and production, can not be flexible for different series The product is flexibly adjusted. For example, if the displacement is different but the rotation speed and piston stroke are the same, the balance layout of the required balance block changes due to the change of the piston diameter, that is, the balance block is set differently. Different crankshafts and corresponding molds are opened, resulting in an increase in production costs and a long production cycle, so that the production requirements of the enterprise cannot be met.

Summary of the invention

In view of the deficiencies of the conventional integral air compressor crankshaft, the present invention proposes an air compressor The purpose of the crankshaft is to make the crankshaft with a modular structure and a modular process. At the same time, it is easy to adjust the layout of the balance block to expand its ability to adapt to different types of compressors, thereby reducing the production cost of the compressor.

The object of the invention is achieved by an air compressor crankshaft comprising an eccentric journal, a crank arm coupled to the eccentric journal, a counterweight coupled to the crank arm or/and the eccentric journal, characterized by the crank Both the arm and the weight are composed of flat piece parts, and the number of flat piece parts constituting the weight is at least one.

The air compressor crankshaft described above is provided with a positive mounting hole on the crank arm, and an optional mounting hole is prefabricated, and a positive mounting hole and a pre-made alternative mounting hole are also provided on the balancing block.

The eccentric journal described above is a separate member, and the eccentric journal and the crank arm are fastened to each other integrally.

The above air compressor crankshaft has one or more of the following four connection modes:

1) a riveted connection fastening manner is adopted between the crank arm and the balance block, between the components constituting the balance block, and between the eccentric journal and the crank arm;

2) a bolt connection between the crank arm and the balance block, between the components constituting the balance block, and between the eccentric journal and the crank arm;

3) Folding and fastening between the crank arm and the balance block, between the components constituting the balance block, and between the eccentric journal and the crank arm;

4) A welding fastening method is adopted between the crank arm and the balance block, between the members constituting the balance block, and between the eccentric journal and the crank arm.

A hub is connected to the crankshaft, and a fan blade is annularly distributed on the hub, and a rotation preventing structure is disposed on the hub or/and the blade, and the rotation preventing structure is disposed in an offset manner with respect to a rotation axis of the fan.

The above-mentioned rotation stop structure is a hole-like structure, and the hole is inserted through the hole by a screw or a pin member, and the crankshaft body, The crankshaft is connected to the extension body.

The above-mentioned rotation stop structure is a boss-like structure and is connected to a groove or a hole in the crankshaft body and the crankshaft extension body.

The above-mentioned rotation stop structure is a groove-like structure and is connected to a boss body or a boss or a stud on the crankshaft extension body.

The rotation stop structure is a concave stop structure and is connected to the crankshaft body, the stop boss on the crankshaft extension, the stop shoulder or the stop stop pin.

The above-mentioned rotation stop structure is a convex stop-like structure and is connected to the crank body, the stop groove on the crankshaft extension body, the stop hole or the stop arc.

The advantages of the present invention over the prior art are:

1. The present invention adopts a combination of flat piece parts to form a crank arm and a balance block of a crankshaft. Since the flat piece parts can be manufactured by punching, the production cost is lower; since the sheet parts are overlapped. Tightening the weight of the balance block, the weight of the balance block can be adjusted according to the number of different compressor products. In addition, an optional mounting hole is reserved on the crank arm and the balance block, and the installation layout of the balance block can be changed as needed. Therefore, the weight of the present invention is more adaptable.

2. The present invention provides a non-rotation structure on a crankshaft with a hub or/and a blade, and the biasing structure is offset from the axis of rotation of the fan, and the eccentricity can be much larger than the conventional stop radius, thus It can effectively amplify the torque against the loosening of the fan, in other words, the fan's anti-rotation ability is enhanced, thereby improving the operational reliability of the compressor.

DRAWINGS

1 is a schematic view showing the axial direction of a crankshaft of an air compressor according to the present invention;

Figure 2 is a perspective view of the embodiment of the present invention shown in Figure 1;

Figure 3 is an exploded view of the assembly of the embodiment of the present invention;

Figure 4 is a schematic exploded view of the hub or/and the blade on the crankshaft of the present invention;

Figure 5 is a cross-sectional isometric view of the assembled structure of Figure 4;

6 is a schematic exploded view of the hub or/and the rotation preventing structure on the blade of the present invention, which is a key-shaped boss-shaped rotation preventing structure;

Figure 7 is a cross-sectional isometric view of the assembled structure of Figure 6;

Figure 8 is a schematic exploded view of the hub of the present invention on the crankshaft or/and the anti-rotation structure on the blade is a circular boss-shaped rotation preventing structure;

Fig. 9 is a cross-sectional perspective view showing the assembly structure of the hub or/and the rotation preventing structure on the crankshaft of the present invention in a groove shape.

detailed description

The present invention will be further described below by way of specific embodiments, see Figures 1-9:

A combined air compressor crankshaft comprising an eccentric journal 1 , a crank arm 2 connected to the eccentric journal 1 , a balance block 3 connected to the crank arm 2 or/and the eccentric journal 1 , wherein the eccentric journal 1 can be The journal body 1a coupled with the large end bearing of the compressor connecting rod and the shaft hole 1b coupled with the motor rotating shaft are combined, and the eccentric journal 1 can also be coupled by the journal body 1a coupled with the large bearing of the compressor connecting rod and The utility model is composed of a shaft head which is coupled with the motor shaft; the invention is characterized in that the crank arm 2 and the weight 3 are combined by flat-shaped parts, and the number of flat-shaped parts constituting the weight 3 can be increased. a piece, but at least one piece; since the flat piece forming the crank arm 2 and the weight 3 can be manufactured by punching, it has a lower production cost; in addition, since the sheet-like parts are stacked tightly Solid component balance block 3, so it can be increased or decreased according to different compressor product requirements The number of the balance block 3 is adjusted to be more adaptive.

In order to further improve the adaptability of the crankshaft, a positive selection mounting hole 2a may be disposed on the crank arm 2, and the optional mounting hole 2b may be pre-prepared, and a positive selection mounting hole 2a and a pre-preparation option may be disposed on the balance block 3 accordingly. The mounting hole 2b, at which time the fastening member can position the mutual position of the layout with the crank arm 2 and the positive mounting hole 2a of the weight 3, or can be positioned with the optional mounting hole 2b of the crank arm 2 and the weight 3. The mutual position of the layout, in other words, the balance block 3 can select a plurality of layout schemes, thereby obtaining different dynamic balance effects, that is, the balance weight 3 can be selected according to the characteristics of different compressor products. The eccentric journal 1 of the present invention may be a separate member, and the eccentric journal 1 and the crank arm 2 are fastened to each other integrally.

The air compressor crankshaft of the present invention has one or more of the following four connection modes: 1) between the crank arm 2 and the weight 3, between the members constituting the weight 3, the eccentric journal 1 and the crank A fastening method in which the rivets 4 are connected between the arms 2; 2) a tight connection between the crank arms 2 and the weight 3, between the members constituting the weight 3, and between the eccentric journal 1 and the crank arm 2 3) between the crank arm 2 and the weight 3, between the members constituting the weight 3, the eccentric journal 1 and the crank arm 2 are fastened by a buckle; 4) the crank arm 2 A fastening method is used between the respective members constituting the weight 3 and the balance block 3, and between the eccentric journal 1 and the crank arm 2.

The crankshaft of the present invention has an advantage over the prior art in that the crank arm 2 and the weight 3 are combined by flat-plate parts, and the flat-shaped parts can be manufactured by punching, thereby having a lower In addition, since the sheet-like parts are stacked to form a balance block, the quality of the balance block can be adjusted according to the number of different compressor products, so that it is more adaptable.

A hub 5 is attached to the crankshaft of the present invention, and a fan blade 6 is annularly distributed on the hub 5, and the hub 5 and the blade 6 are driven by the crankshaft 1 and rotate therewith. The invention is characterized in that a non-rotation structure is arranged on the hub 5 or/and the blade 6, the anti-rotation structure being offset from the axis of rotation 01 of the fan. The offset means that the main structure of the rotation stop structure (ie, the portion and the member that resists the rotation of the fan relative to the circumferential direction of the crankshaft 1) has a certain distance from the rotation axis 01, and since the rotation stop structure is biased, Obtaining a relatively large stop eccentricity, in other words, the eccentricity constitutes a main body of the stop arm that resists the rotation of the fan in the circumferential direction relative to the crankshaft 1, and the cooling fan is derived when the compressor is rotated and stopped. When the inertia torque is applied to and off, the stop torque can be generated by the presence of the stop eccentricity, thereby ensuring that the cooling fan does not loosen relative to the crankshaft 1. It should be noted that the anti-rotation structure can be directly connected to the body of the crankshaft 1 or can be connected to the extension body of the crankshaft 1. The extension body of the crankshaft 1 includes both the balance block 3 of the crankshaft 1 and other forms of the crankshaft. 1 An integrally formed member or a member that is fastened to the crankshaft 1. In addition, it should be noted that the blade 6 of the present invention includes both the conventional blade blade and the blade body, such as the flow guiding back plate 6a, the guiding ring band 6b, and the connecting plate which are integrally rotated with the blade. The member 6c and the like belong to the category of the blade extension body, wherein the function of the flow guiding back plate 6a is mainly for guiding and restraining the airflow for radial flow, and the function of the guiding ring band 6b is mainly for guiding and restraining the airflow. The axial flow, the function of the web member 6c is primarily to connect and drive the fan blades 6. Further, for the sake of simplicity, the body of the crankshaft 1 may be referred to as a crankshaft body, and the extended body of the crankshaft 1 may be referred to as a crankshaft extension body, and the extension of the blade is referred to as a blade extension body.

The rotation stop structure of the present invention can be formed into a hole-like structure 7a. In this case, the screw 77a or/and the pin member 77b can be inserted through the hole to connect with the crankshaft body and the crankshaft extension body; The hole-like structure 7a includes both a plurality of circular holes and a special-shaped hole and a threaded hole. When it is a threaded hole structure, it is even possible to use a bolt to be inserted into the crankshaft body or the crankshaft extension to be fastened to the screw hole.

The rotation stop structure of the present invention can be fabricated as a boss-like structure 7b in which the shape of the boss-like structure 7b, It may be a convex key or a convex cylindrical shape, or may be a convex column structure of other shapes. At this time, a groove 9a or a hole 9b corresponding to the crankshaft body and the crankshaft extension body is opened. The structure 7b is coupled to the crank body, the groove 9a or the hole 9b on the crankshaft extension body; it should be noted that the groove 9a may be a pit-shaped groove or a notch-shaped groove shape, and the hole 9b may be The through holes may also be blind holes, may be round holes or may be various shaped holes of other forms.

The anti-rotation structure of the present invention may be a groove-like structure 7c. At this time, a boss 8a or a stud corresponding to the crank body and the crankshaft extension body is opened, and the groove-like structure 7c and the above-mentioned boss 8a or The protruding portion 8c may be a recessed groove or a notched groove. The boss 8a may be a convex key structure or a convex cylindrical structure. The boss 8a can also be other forms of boss structures.

The anti-rotation structure of the present invention may also be a concave stop-like structure, and a cranking boss, a stop shoulder, and a stop stop pin corresponding to the crankshaft body and the crankshaft extension body are formed. The structure is connected to the above-mentioned stop boss, the stop shoulder or the stop pin.

The anti-rotation structure of the present invention may also be a convex stop-like structure, and a corresponding groove groove, a stop hole or a stop arc corresponding to the crank body and the crankshaft extension body may be formed, and the convex stop structure and The above-mentioned stop groove, the stop hole or the stop port are connected.

It should be noted that the specific structural solutions of the above-mentioned embodiments of the anti-rotation structure of the present invention can be used independently or in combination, and can also be used in combination with a conventional anti-loose structure, so that the anti-loosening effect of the fan can be achieved. Better.

The advantage of the prior art of the anti-rotation structure of the present invention is that the anti-rotation structure is provided on the hub 5 or/and the blade 6 and the anti-rotation structure is biased relative to the axis of rotation 01 of the fan. The eccentricity can be much larger than the traditional stop radius, so it can effectively amplify the torque against the fan's looseness, in other words The fan's anti-rotation capability is enhanced, which improves the operational reliability of the compressor.

The above embodiments are only one of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, various equivalent changes made in accordance with the structure, shape and principle of the present invention should be Within the scope of protection of the present invention.

Claims

An air compressor crankshaft comprising an eccentric journal, a crank arm coupled to the eccentric journal, a balance block coupled to the crank arm or/and the eccentric journal, wherein the crank arm and the weight are both flat The part is constructed in which at least one of the number of flat pieces constituting the weight is at least one piece.
The air compressor crankshaft according to claim 1, wherein said crank arm is provided with a positive mounting hole, and an optional mounting hole is prefabricated, and correspondingly, a positive mounting hole is also provided on the weight block. Prefabricated with optional mounting holes.
The air compressor crankshaft according to claim 1, wherein said eccentric journal is a separate member, and said eccentric journal and said crank arm are fastened to each other integrally.
The air compressor crankshaft according to any one of claims 1 to 3, wherein a crankshaft is connected to the crankshaft, a fan blade is annularly distributed on the hub, and a rotation preventing structure is arranged on the hub or/and the blade. The anti-rotation structure is offset from the axis of rotation of the fan.
The air compressor crankshaft according to claim 4, wherein the rotation preventing structure is a hole-like structure, and the hole is inserted through the hole by a screw or a pin member to be coupled to the crankshaft body and the crankshaft extension.
The air compressor crankshaft according to claim 4, wherein said rotation stop structure is a boss-like structure and is coupled to a crank body, a groove or a hole in the crankshaft extension.
The air compressor crankshaft according to claim 4, wherein said rotation stop structure is a groove-like structure and is coupled to the crank body, the boss or the stud on the crankshaft extension.
The air compressor crankshaft according to claim 4, wherein said rotation stop structure is a concave stop structure and is coupled to the crankshaft body, the stop boss on the crankshaft extension body, the shoulder shoulder or the mouthpiece Stop pin connection.
The air compressor crankshaft according to claim 4, wherein the rotation stop structure is a convex stop structure, and the crank body, the stop groove on the crankshaft extension body, the stop hole or the stop arc connection.