阅读说明：本技术 一种隔膜泵用三缸三支撑曲轴及加工工艺 (Three-cylinder three-support crankshaft for diaphragm pump and machining process ) 是由 李峰 王建成 蒋科 祁文 刘乐 王贵 屈卫德 左仓 卢飚 段鹏飞 宁轩 赵军 于 2019-11-08 设计创作，主要内容包括：本发明提供一种隔膜泵用三缸三支撑曲轴及加工工艺,解决现有曲轴刚度和强度差、结构笨重或者重量重、价格昂贵、加工和装配工艺困难的问题。曲轴包括输入轴、多个轴颈以及用于连接轴颈的多个曲柄臂；多个轴颈包括依次设的第一支撑轴颈、第一连杆轴颈、第二连杆轴颈、第二支撑轴颈、第三连杆轴颈、与输入轴同轴连接的第三支撑轴颈；第一支撑轴颈、第二支撑轴颈、第三支撑轴颈同轴设置；第一支撑轴颈和第三支撑轴颈的直径相等,且小于第二支撑轴颈、第一连杆轴颈的直径；第一、第二、第三连杆轴颈直径相等且以第一支撑轴颈的轴心为圆心圆周均布；所有曲柄臂均为圆弧变径过渡结构,且曲柄臂两侧端面圆心连线的垂直截面为椭圆形。(The invention provides a three-cylinder three-support crankshaft for a diaphragm pump and a processing technology thereof, and solves the problems of poor rigidity and strength, heavy structure or weight, high price and difficult processing and assembling technology of the conventional crankshaft. The crankshaft includes an input shaft, a plurality of journals, and a plurality of crank arms for connecting the journals; the plurality of journals comprise a first supporting journal, a first connecting rod journal, a second supporting journal, a third connecting rod journal and a third supporting journal which is coaxially connected with the input shaft, wherein the first supporting journal, the first connecting rod journal, the second supporting journal, the third connecting rod journal and the third supporting journal are sequentially arranged; the first supporting journal, the second supporting journal and the third supporting journal are coaxially arranged; the diameters of the first support journal and the third support journal are equal and smaller than the diameters of the second support journal and the first connecting rod journal; the diameters of the first connecting rod journal, the second connecting rod journal and the third connecting rod journal are equal and are uniformly distributed on the circumference by taking the axle center of the first supporting journal as the circle center; all the crank arms are of circular arc reducing transition structures, and the vertical sections of the circle center connecting lines of the end surfaces on the two sides of the crank arms are oval.)

1. The utility model provides a three jar three support bent axles for diaphragm pump which characterized in that: comprises an input shaft (8), a plurality of journals and a plurality of crank arms (7) for adapting connection of adjacent journals;

the plurality of journals comprise a first supporting journal (1), a first connecting rod journal (4), a second connecting rod journal (5), a second supporting journal (2), a third connecting rod journal (6) and a third supporting journal (3) which are arranged in sequence;

the first support journal (1), the second support journal (2) and the third support journal (3) are coaxially arranged, and the third support journal (3) is coaxially connected with the input shaft (8);

the diameters of the first connecting rod journal (4), the second connecting rod journal (5) and the third connecting rod journal (6) are equal;

the diameters of the first supporting journal (1) and the third supporting journal (3) are equal and smaller than the diameters of the second supporting journal (2) and the first connecting rod journal (4);

the first connecting rod journal (4), the second connecting rod journal (5) and the third connecting rod journal (6) are uniformly distributed along the clockwise circumference by taking the axle center of the first supporting journal (1) as the circle center;

all the crank arms (7) are of circular arc reducing transition structures, and the vertical sections of the connecting lines of the circle centers of the end surfaces on the two sides of the crank arms (7) are elliptical.

2. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 1, wherein: the aspect ratio range of the ellipse is 1.0-1.8.

3. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 2, wherein: the aspect ratio range of the ellipse is 1.0-1.6.

4. A three-cylinder three-support crankshaft for a diaphragm pump according to any one of claims 1 to 3, characterized in that: the diameter ratio of the first supporting shaft neck (1) to the second supporting shaft neck (2) is 0.3-0.8;

the diameter ratio of the first supporting shaft neck (1) to the first connecting rod shaft neck (4) is 0.5-1.0.

5. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 4, wherein: the diameter ratio of the first supporting journal (1) and the second supporting journal (2) is 0.53;

the diameter ratio of the first supporting journal (1) to the first connecting rod journal (4) is 0.83.

6. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 1, wherein: the radial size of the port of the second support journal (2) is larger than the radial sizes of the ports of the second connecting rod journal (5) and the third connecting rod journal (6) on the two sides of the second support journal;

the radial size of the port of the crank arm (7) between the second connecting rod journal (5) and the second supporting journal (2) is gradually increased from one end close to the second connecting rod journal (5) to one end close to the second supporting journal (2);

the radial size of the port of the crank arm (7) between the second supporting journal (2) and the third connecting rod journal (6) is gradually reduced from one end close to the second supporting journal (2) to one end close to the third connecting rod journal (6).

7. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 6, wherein: a weight-reducing structure (9) is arranged at one end, close to the second connecting rod journal (5), of the crank arm (7) between the second connecting rod journal (5) and the second supporting journal (2);

the weight-reducing structure (9) is located outside the second connecting rod journal (5).

8. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 7, wherein: the crankshaft (11) is made of alloy steel.

9. The three-cylinder three-support crankshaft for a diaphragm pump according to claim 8, wherein: the crankshaft (11) is made of 34CrNiMo or 35CrMo or 42CrMo or 40 Cr.

10. A process for manufacturing a three-cylinder three-support crankshaft for a diaphragm pump according to any one of claims 1 to 9, comprising the steps of:

1) machining the crankshaft into a blank by adopting an integral forging process according to the design size of the crankshaft;

2) carrying out rough turning on the journal part of the blank;

3) the input shaft (8) and the shaft neck are processed by finish milling, and the crank arm (7) is processed by finish milling.

Technical Field

The invention relates to a crankshaft technology in a reciprocating pump, in particular to a three-cylinder three-support crankshaft for a diaphragm pump and a processing technology.

Background

In a reciprocating pump, a crankshaft is one of important parts for converting the self-rotation motion of a speed reducer into the circular motion of a crank pin (a component of the crankshaft), and the circular motion of the crank pin is further converted into the reciprocating motion of a piston.

The crankshaft commonly used in reciprocating pumps can be classified into crank shaft, eccentric wheel shaft, N-shaped shaft, etc. The crank shaft is the most common, and the most common crank shaft on the market is a three-throw double support and a three-throw four support; the three-throw double support comprises two coaxially arranged support journals and three connecting rod journals arranged between the two support journals, crank arms are arranged between every two adjacent connecting rod journals and between the connecting rod journals and the support journals, and the three connecting rod journals are connected into a whole, so that the three-throw double support is poor in rigidity and strength and heavy in structure; the three-throw four-support is characterized in that two supports are added on the basis of three-throw double support, a crank arm between two adjacent connecting rod journals is used as an intermediate support, due to the fact that the supports are added, bending deformation of a crankshaft and inclination angle of a main journal are good in rigidity and strength, but for a reciprocating pump with a large stroke, the diameter of the crank arm is large, as shown in fig. 1, the crank arm 01 is of a cylinder structure, the weight of the crankshaft is too heavy, mechanical performance cannot be guaranteed, the pump cannot work normally, and the crank arm is large in size due to the design of the crankshaft with the large rotation diameter, the price is high, and processing and assembling processes are difficult.

Disclosure of Invention

The invention provides a three-cylinder three-support crankshaft for a diaphragm pump and a processing technology thereof, and aims to solve the technical problems that the existing crankshaft is poor in rigidity and strength, heavy in structure, heavy in weight, high in price and difficult in processing and assembling technology.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a three-cylinder three-support crankshaft for a diaphragm pump is characterized in that: comprises an input shaft, a plurality of journals and a plurality of crank arms for adapting and connecting adjacent journals; the plurality of journals comprise a first supporting journal, a first connecting rod journal, a second supporting journal, a third connecting rod journal and a third supporting journal which are arranged in sequence; the first support journal, the second support journal and the third support journal are coaxially arranged, and the third support journal is coaxially connected with the input shaft; the diameters of the first connecting rod journal, the second connecting rod journal and the third connecting rod journal are equal; the diameters of the first supporting journal and the third supporting journal are equal and smaller than the diameters of the second supporting journal and the first connecting rod journal; the first connecting rod journal, the second connecting rod journal and the third connecting rod journal are uniformly distributed along the clockwise circumference by taking the axle center of the first supporting journal as the circle center; all the crank arms are of circular arc reducing transition structures, and the vertical sections of the circle center connecting lines of the end surfaces on the two sides of the crank arms are oval.

Further, the aspect ratio range of the ellipse is 1.0-1.8.

Further, the aspect ratio range of the ellipse is 1.0-1.6.

Further, the diameter ratio of the first supporting shaft neck to the second supporting shaft neck is 0.3-0.8; the diameter ratio of the first support journal to the first connecting rod journal is 0.5-1.0.

Further, the diameter ratio of the first and second supporting journals is 0.53; the diameter ratio of the first supporting journal and the first connecting rod journal is 0.83.

Further, the radial size of the port of the second support journal is larger than that of the ports of the second connecting rod journal and the third connecting rod journal on two sides of the second support journal;

the radial size of the port of the crank arm between the second connecting rod journal and the second supporting journal is gradually increased from one end close to the second connecting rod journal to one end close to the second supporting journal;

the radial dimension of the end opening of the crank arm between the second supporting journal and the third connecting rod journal gradually decreases from the end close to the second supporting journal to the end close to the third connecting rod journal.

Furthermore, a weight reduction structure is arranged at one end of the crank arm between the second connecting rod journal and the second supporting journal and close to the second connecting rod journal;

the weight-reducing structure is positioned on the outer side of the second connecting rod journal.

Further, the crankshaft raw material is alloy steel.

Further, the crankshaft raw material is 34CrNiMo or 35CrMo or 42CrMo or 40 Cr.

Meanwhile, the invention provides a processing technology of a three-cylinder three-support crankshaft for a diaphragm pump, which is characterized by comprising the following steps:

1) machining the crankshaft into a blank by adopting an integral forging process according to the design size of the crankshaft;

2) carrying out rough turning on the journal part of the blank;

3) and the input shaft and the shaft neck are subjected to finish milling, and the crank arm is subjected to finish milling.

Compared with the prior art, the invention has the advantages that:

1. the three-cylinder three-support crankshaft for the diaphragm pump is a three-throw three-support structure, wherein three throws comprise a first connecting rod journal, a second connecting rod journal and a third connecting rod journal, and three supports comprise a first supporting journal, a second supporting journal and a third supporting journal; compared with four supports, the invention has the advantages of one less stress point, more uniform stress and lower processing and assembling difficulty.

2. The crank arm between the three-cylinder three-support crankshaft journals for the diaphragm pump is of an arc reducing transition structure, the radial size of the crank arm is small, and when the bearings are installed on the journals of the crankshaft, the bearings can be guaranteed to smoothly pass through the crank arm on the premise of guaranteeing the strength and the rigidity, so that the integral weight of the crankshaft is light, the cost is low, and the processing and assembling processes are simple.

3. According to the three-cylinder three-support crankshaft for the diaphragm pump, the weight reduction structure is arranged on the crank arm between the second connecting rod journal and the second support journal, so that the weight can be effectively reduced, and the influence on the strength is small.

4. The three-cylinder three-support crankshaft for the diaphragm pump is manufactured into a blank by adopting an integral forging process, so that the rigidity and the strength of the crankshaft can be improved, and stress damage can be prevented.

Drawings

FIG. 1 is a schematic view of a portion of a prior art crankshaft;

in fig. 1, the reference numerals are as follows:

01-crank arm.

FIG. 2 is a schematic structural view of a three-cylinder three-support crankshaft for a diaphragm pump according to the present invention;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a partial cross-sectional view of FIG. 2 (a first connecting rod journal, a second connecting rod journal, and a crank arm therebetween in a three-cylinder three-support crankshaft for a diaphragm pump);

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

FIG. 6 is a schematic perspective view of a three-cylinder three-support crankshaft for a diaphragm pump according to the present invention;

in fig. 2 to 6, the reference numerals are as follows:

1-first support journal, 2-second support journal, 3-third support journal, 4-first connecting rod journal, 5-second connecting rod journal, 6-third connecting rod journal, 7-crank arm, 8-input shaft, 9-weight reduction structure.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 2 and 6, a three-cylinder three-support crankshaft for a diaphragm pump comprises an input shaft 8, a plurality of journals and a plurality of crank arms 7 for adapting and connecting adjacent journals, wherein the plurality of journals comprise a first support journal 1, a first connecting rod journal 4, a second connecting rod journal 5, a second support journal 2, a third connecting rod journal 6 and a third support journal 3 which are arranged in sequence; the first support journal 1, the second support journal 2 and the third support journal 3 are coaxially arranged, and the third support journal 3 is coaxially connected with the input shaft 8; the diameters of the first connecting rod journal 4, the second connecting rod journal 5 and the third connecting rod journal 6 are equal; the diameters of the first support journal 1 and the third support journal 3 are equal and smaller than the diameters of the second support journal 2 and the first connecting rod journal 4; as shown in fig. 3, the first connecting rod journal 4, the second connecting rod journal 5 and the third connecting rod journal 6 are uniformly distributed along the clockwise circumference with the axle center of the first supporting journal 1 as the center of circle; all the crank arms 7 are of circular arc reducing transition structures, and the vertical sections at the middle points of the connecting lines of the circle centers of the end surfaces on the two sides of the crank arms 7 are elliptical. The aspect ratio of the ellipse is in the range of 1.0 to 1.8, and preferably in the range of 1.0 to 1.6.

The radial size of the port of the second support journal 2 is larger than the radial sizes of the ports of the second connecting rod journal 5 and the third connecting rod journal 6 on the two sides of the second support journal; the radial dimension of the end of the crank arm 7 between the second connecting rod journal 5 and the second support journal 2 gradually increases from the end near the second connecting rod journal 5 to the end near the second support journal 2; the radial dimension of the end of the crank arm 7 between the second support journal 2 and the third connecting rod journal 6 is gradually reduced from the end close to the second support journal 2 to the end close to the third connecting rod journal 6, and preferably, a weight reducing structure 9 is formed at the end of the crank arm 7 between the second connecting rod journal 5 and the second support journal 2 and close to the second connecting rod journal 5, and the weight reducing structure 9 is located at the outer side of the second connecting rod journal 5, as shown in fig. 6, the weight can be effectively reduced, and the influence on the strength is not great.

In the present embodiment, the diameter of the second supporting journal 2 and the diameter of the first connecting rod journal 4 are both larger than the diameter of the first supporting journal 1, and generally the diameter ratio of the first supporting journal 1 to the second supporting journal 2 is 0.3 to 0.8, the diameter ratio of the first supporting journal 1 to the first connecting rod journal 4 is 0.5 to 1.0, and preferably the diameter ratio of the first supporting journal 1 to the second supporting journal 2 is 0.53, and the diameter ratio of the first supporting journal 1 to the first connecting rod journal 4 is 0.83.