阅读说明：本技术 一种往复泵两端小斜齿轮的同步性结构 (Synchronism structure of bevel pinions at two ends of reciprocating pump ) 是由 黄秀芳 于 2021-11-08 设计创作，主要内容包括：本发明公开了一种往复泵两端小斜齿轮的同步性结构,涉及石油工程设备领域,具体包括电机轴、左旋小斜齿轮、右旋小斜齿轮、M4内六角螺钉、定位平键、平键侧面、电机轴键槽侧面、斜齿轮内孔键槽侧面、导向圆弧9,目前一种新型往复泵在电机轴支撑轴承外两端面直接安装小斜齿轮,出现了外伸梁的小斜齿轮寿命短,设计了一种往复泵延长小斜齿轮寿命的结构,这种结构的小斜齿轮不能安装在电机轴最端部,电机轴两端各伸长100mm以上,用现有专利《一种齿轮轴两端斜齿轮的对中装置及其制造、装配方法》不能满足改进后结构两端小斜齿轮的同步性,通过本方案可以很好解决一种往复泵两端小斜齿轮的同步性,而且制造的方法更容易,加工精度更容易保证。(The invention discloses a synchronism structure of bevel pinion gears at two ends of a reciprocating pump, which relates to the field of petroleum engineering equipment and particularly comprises a motor shaft, a left-handed bevel pinion gear, a right-handed bevel pinion gear, an M4 internal hexagonal screw, a positioning flat key, a flat key side, a motor shaft key slot side, a bevel gear inner hole key slot side and a guide arc 9. the bevel pinion gears are directly arranged on two end faces outside a motor shaft support bearing of the prior reciprocating pump, the service life of the bevel pinion gears with an extending beam is short, a structure for prolonging the service life of the bevel pinion gears of the reciprocating pump is designed, the bevel pinion gears of the structure can not be arranged at the most end part of the motor shaft, the two ends of the motor shaft respectively extend by more than 100mm, the synchronism of the bevel pinion gears at two ends of the improved structure can not be satisfied by using the existing patent centering device of the bevel gears at two ends of the gear shaft and a manufacturing and assembling method thereof, and the synchronism of the bevel pinion gears at two ends of the reciprocating pump can be well solved by the scheme, and the manufacturing method is easier, and the processing precision is easier to guarantee.)

1. The utility model provides a synchronism structure of reciprocating pump both ends beveled pinion, its characterized in that, motor shaft (1), levogyration beveled pinion (2), dextrorotation beveled pinion (3), M4 hexagon socket head cap screw (4), location parallel key (5), parallel key side (6), motor shaft keyway side (7), helical gear hole keyway side (8), direction circular arc (9).

2. The synchronous structure of the helical gears at two ends of the reciprocating pump according to claim 1, wherein the large end faces of the conical surfaces of the left helical gear 2 and the right helical gear 3 which are arranged at two ends of the motor shaft (1) are respectively provided with a small key groove, the length of each small key groove is 25mm, the width of each small key groove is 12mm, the depth of each small key groove is 4.3-4.5 mm, the symmetrical surfaces of the small key grooves at two ends of the motor shaft (1) are in the same section of the same side surface of the motor shaft (1), the section contains the axis of the motor shaft (1), the width tolerance of the keyway side surface (7) of the motor shaft is controlled at 7-level precision, the surface roughness is Ra1.6 mu m, a small screw hole of M4 is processed at the center of the bottom surface of the key slot, the depth of the screw hole is 7mm, after the left-handed helical gear 2 and the right-handed helical gear 3 are assembled on the motor shaft (1), the length of the positioning flat key (5) is required to be half outside the large ends of the taper holes of the left-handed helical gear (2) and the right-handed helical gear (3).

3. The synchronous structure of the bevel pinions at the two ends of the reciprocating pump as claimed in claim 1, wherein a small key groove is respectively processed in the inner holes of the large end surfaces of the taper holes of the left-handed bevel pinion (2) and the right-handed bevel pinion (3), the length of the small key groove is 16mm, the width of the small key groove is 12mm, the depth of the small key groove is 4mm (excluding the depth of the circular arc), the symmetrical surfaces of the small key grooves of the left-handed bevel pinion (2) and the right-handed bevel pinion (3) are overlapped with the symmetrical surfaces of the taper holes of the left-handed bevel pinion (2) and the right-handed bevel pinion (3), the central line of the end surface tooth widths of the left-handed bevel pinion (2) and the right-handed bevel pinion (3) is in the section, the width tolerance of the side surface (8) of the inner hole key groove of the bevel pinion is 7-grade precision, and the surface roughness is Ra1.6 μm.

4. The synchronous structure of the beveled bevel gears at the two ends of the reciprocating pump as claimed in claim 1, wherein the length of the positioning flat key (5) is 25mm, the width is 12mm, the height is 8mm, a countersunk hole for installing the M4 socket head cap screw (4) is processed on the positioning flat key (5), when the M4 socket head cap screw (4) is installed, the requirement that the head of the M4 socket head cap screw (4) is flush with the upper plane of the positioning flat key (5) is met, the width tolerance of the two flat key side surfaces (6) of the positioning flat key (5) is 6-level precision, the surface roughness is Ra0.8 μ M, the length direction of the positioning flat key (5) is in clearance fit with the length direction of the motor shaft (1), and the two ends of the positioning flat key (5) are in the shape of the guide circular arc (9).

5. The synchronous structure of the bevel pinions at the two ends of the reciprocating pump as claimed in claim 1, wherein the two flat key side surfaces (6) of the positioning flat key (5) are in light interference connection with the two motor shaft key groove side surfaces (7) in the form of R7/h6, and the two flat key side surfaces (6) of the positioning flat key (5) are in transition fit connection with the bevel gear inner hole key groove side surfaces (8) in the form of JS7/h 6.

6. The synchronous structure of the bevel pinions at the two ends of the reciprocating pump as claimed in claim 1, wherein the motor shaft (1) has a length of 2500mm, and two small keyways are simultaneously machined during one-time installation on a machine tool.

Technical Field

The invention relates to the field of petroleum engineering equipment, in particular to a synchronous structure of bevel pinions at two ends of a reciprocating pump.

Background

Two reciprocating pumps with very similar structures, namely a drilling pump and a fracturing pump, appear in the field of petroleum engineering equipment. The most similar point is that the belt transmission stage of the two-stage transmission of the belt transmission and the gear transmission from the original main motor to the crankshaft is cancelled, and the small bevel gears are directly installed at the two ends outside the shaft support bearing of the motor to drive the large gear on the crankshaft. Useful functions of this improvement are: the original transmission chain is greatly shortened, the size of the pump set of the two reciprocating pumps is greatly reduced, the weight is also reduced, and the power consumption of belt transmission is also reduced. However, this improvement also has a detrimental function: although the original two-stage transmission has large volume and heavy weight, the condition that the service life of a belt, a belt pulley and a gear pair is short does not occur. The gear transmission in the original two-stage transmission is that the gear is placed between two bearings, the gear stress structure belongs to a simply supported beam structure, and the gear installation position after the belt pulley transmission is cancelled is that the gear is placed on the outer sides of the two bearings, so that the original simply supported beam structure is changed into an extending beam structure. The bevel pinion of the extension beam is easy to bend a motor shaft after being stressed, and the meshing length of the gear pair can be seriously influenced, so that the condition that a large number of gear pairs are damaged occurs. In order to prolong the service life of the gear pair, a plurality of measures are taken: thickening the shaft of the gear; the material of the gear is greatly improved; the tooth profile of the gear is corrected, and the gear is manufactured according to the deformation condition of the maximum force (the contact is not good when the stress does not reach the maximum value which is designed in advance); by adopting the measures, the cost is greatly increased by more than 2 times compared with the original cost, and the gear damage is still caused occasionally without putting an end to the work. Therefore, the structure for prolonging the service life of the bevel pinion of the reciprocating pump is designed, the bevel pinion cannot be installed at the end part of the motor shaft, the distance between the end surface of the bevel pinion and the end surface of the motor shaft is at least more than 100mm, and the improved structure cannot be met by the design of the centering device for the bevel pinion at two ends of the gear shaft and the manufacturing and assembling method thereof, which are applied in 3, month and 30 of 2012, the reason is that:

1. the structure of the centering device is that the bevel pinion is arranged at the end part of a motor shaft, the centering device is characterized in that positioning holes are respectively arranged on two end surfaces of the motor shaft, the positioning holes are also arranged on the end surfaces of a left bevel gear and a right bevel gear, and the positioning holes are also arranged on the positioning plates, when the centering device is assembled, the distance between three planes of the end surface of the motor shaft, the end surface of the bevel pinion and the end surface of the positioning plate is controlled within 0-8 mm, and the distance between the end surface of the motor shaft and the end surface of the bevel pinion in the existing new structure is more than 100mm, so the original patent technology cannot meet the requirement on synchronism.

2. The patent of the centering device for the helical gears at two ends of the gear shaft and the manufacturing and assembling method thereof requires high requirements on numerical control equipment for positioning holes at two ends of a motor shaft to be processed, because the motor shaft is very long and the length of some helical gears reaches more than 2500mm, two methods are adopted for processing the numerical control equipment, firstly, a workbench for mounting the motor shaft does not rotate, an accessory milling head of the numerical control equipment rotates 180 degrees to process holes at two sides respectively, the specification of the numerical control equipment to be selected is large, and the workbench must be very long; the second method is that the workbench for installing the motor shaft needs to rotate, which requires high rotating precision of the workbench; the two processing methods have many influence factors on the processing precision, if the precision is well ensured, the requirements on equipment are very high, the equipment with higher precision is higher in cost, and the manufacturing cost is increased.

Therefore, the design of a new synchronization structure of bevel pinions at two ends of the reciprocating pump becomes a problem to be solved urgently.

Disclosure of Invention

The invention aims to provide a synchronous structure of bevel pinions at two ends of a reciprocating pump.

The technical scheme of the invention is as follows:

the present invention is described in the context of a reciprocating pump above 2200 hp.

The large end faces of the conical surfaces of the left-handed helical gear and the right-handed helical gear are respectively provided with a small key groove, the length of each small key groove is 25mm, the width of each small key groove is 12mm, the depth of each small key groove is 4.3-4.5 mm, the influence on the strength of the motor shaft is very small, the symmetrical surfaces of the small key grooves at the two ends of the motor shaft are arranged in the same cross section of the same side face of the motor shaft, the cross section contains the axis of the motor shaft, the width tolerance of the side face of the key groove of the motor shaft is controlled to be 7-level precision, the surface roughness is Ra1.6 mu M, a small screw hole of M4 is machined in the center of the bottom face of each key groove, the depth of the screw hole is 7mm, and after the left-handed helical gear and the right-handed helical gear are assembled on the motor shaft, half of the length of a flat key is required to be positioned outside the large end of the conical holes of the left-handed helical gear and the right-handed helical gear.

And respectively processing small key grooves in the inner holes of the large end surfaces of the conical holes of the left-handed small helical gear and the right-handed small helical gear, wherein the length of each small key groove is 16mm, the width of each small key groove is 12mm, the depth of each small key groove is 4mm (not including the depth of a circular arc), the symmetrical surfaces of the small key grooves of the left-handed small helical gear and the right-handed small helical gear are superposed with the symmetrical surfaces of the conical holes of the left-handed small helical gear and the right-handed small helical gear, the central lines of the end surface tooth widths of the left-handed small helical gear and the right-handed small helical gear are in the section, the width tolerance of the side surfaces of the key grooves of the inner holes of the helical gears is 7-grade precision, and the surface roughness of the side surfaces of the key grooves of the helical gears is Ra1.6 mu m.

The length of the positioning flat key is 25mm, the width of the positioning flat key is 12mm, the height of the positioning flat key is 8mm, a countersunk hole for installing an M4 socket head cap screw is machined in the positioning flat key, when the M4 socket head cap screw is installed, the head of the M4 socket head cap screw is flush with the upper plane of the positioning flat key, the width tolerance of the two flat key side surfaces of the positioning flat key is 6-level precision, the surface roughness is Ra0.8 mu M, the length direction of the positioning flat key is in clearance fit with the length direction of a motor shaft, two ends of the length direction of the positioning flat key are in a guiding arc shape, and the left-handed helical gear and the right-handed helical gear can be conveniently installed for guiding.

The side surfaces of the two flat keys of the positioning flat key are in light interference connection with the side surfaces of the key grooves of the two motor shafts in a mode of R7/h6, because the friction load is transmitted without depending on the interference of the positioning flat key, the positioning flat key only plays a role in positioning when the left-handed bevel pinion and the right-handed bevel pinion are installed, the function of transmitting torque is not carried out in use, the torque of the left-handed bevel pinion and the right-handed bevel pinion is transmitted by the interference fit of the inner conical surface of the left-handed bevel pinion and the inner conical surface of the right-handed bevel pinion and the outer conical surface of the motor shaft, the component forces in the axial direction of the motor shaft borne by the left-handed bevel pinion and the right-handed bevel pinion are mutually offset, the side surfaces of the two flat keys of the positioning flat key are in transition fit connection with the side surfaces of the key grooves of the inner holes of the bevel gears in a mode of JS7/h6, the centering precision is high, and by adopting the fit, the left-handed bevel pinion and the right-handed bevel pinion can be ensured to be installed at the two ends of the motor shaft, the central lines of the tooth widths of the end faces of the left-handed bevel pinion and the right-handed bevel pinion are in the same cross section, so that the synchronism of the bevel pinions at the two ends is ensured.

The length of the motor shaft 1 is 2500mm, two small key grooves can be simultaneously machined by one-time installation on a machine tool, and the machining precision is very easy to guarantee.

Drawings

FIG. 1 is a broken view of a synchronous structure of bevel pinions at two ends of a reciprocating pump;

FIG. 2-section A-A of FIG. 1;

FIG. 3-section B-B of FIG. 2;

FIG. 4-partial enlarged view C of FIG. 3;

FIG. 5-D section view of FIG. 2;

fig. 6-E of fig. 5 are enlarged partial views.

The reference numerals are as follows

1-motor shaft, 2-left-handed bevel pinion, 3-right-handed bevel pinion, 4-M4 socket head cap screw, 5-positioning flat key, 6-flat key side, 7-motor shaft keyway side, 8-bevel gear inner hole keyway side, and 9-guiding circular arc.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

The embodiments of the present invention are not limited to the following examples, and various changes made without departing from the spirit of the present invention are within the scope of the present invention.

The present invention is described in the context of a reciprocating pump above 2200 hp.

Referring to fig. 1 to 6, the synchronous structure of the bevel pinion at two ends of the reciprocating pump of the present embodiment includes a motor shaft 1, a left-handed bevel pinion 2, a right-handed bevel pinion 3, an M4 socket head cap screw 4, a positioning flat key 5, a flat key side 6, a motor shaft key slot side 7, a bevel gear inner hole key slot side 8, and a guiding arc 9.

Referring to fig. 1 and 2, small key grooves are respectively processed at the large end faces of conical surfaces of a left-handed helical gear 2 and a right-handed helical gear 3 which are arranged at two ends of a motor shaft 1, the length of each small key groove is 25mm, the width of each small key groove is 12mm, the depth of each small key groove is 4.3-4.5 mm, the influence on the strength of the motor shaft is very small, the symmetrical surfaces of the small key grooves at the two ends of the motor shaft 1 are arranged in the same cross section of the same side face of the motor shaft 1, the cross section comprises the axis of the motor shaft 1, the width tolerance of the side face 7 of the key groove of the motor shaft is controlled to be 7-level precision, the surface roughness is Ra1.6 mu M, a small screw hole M4 is processed at the center of the bottom face of each key groove, the depth of each screw hole is 7mm, and after the left-handed helical gear 2 and the right-handed helical gear 3 are assembled on the motor shaft 1, the half of the length of a flat key 5 is required to be positioned outside the large end of the conical hole of the left-handed helical gear 2 and the right-handed helical gear 3.

Referring to fig. 2, 3 and 4, small key grooves are respectively processed in inner holes of large end faces of conical holes of the left-handed small helical gear 2 and the right-handed small helical gear 3, the length of each small key groove is 16mm, the width of each small key groove is 12mm, the depth of each small key groove is 4mm (not including the depth of a circular arc), the symmetrical surfaces of the small key grooves of the left-handed small helical gear 2 and the right-handed small helical gear 3 are overlapped with the symmetrical surfaces of the conical holes of the left-handed small helical gear 2 and the right-handed small helical gear 3, the central line of the end face tooth widths of the left-handed small helical gear 2 and the right-handed small helical gear 3 is in the section, the width tolerance of the side face 8 of the inner hole key groove of the helical gear is 7-level precision, and the surface roughness is Ra1.6 micrometers.

Referring to fig. 2, 3, 4 and 6, the length of the positioning flat key 5 is 25mm, the width is 12mm, the height is 8mm, a countersunk hole for mounting the M4 socket head cap screw 4 is processed on the positioning flat key 5, when the M4 socket head cap screw 4 is mounted, the head of the M4 socket head cap screw 4 is flush with the upper plane of the positioning flat key 5, the width tolerance of two flat key side surfaces 6 of the positioning flat key 5 is 6-level precision, the surface roughness is ra0.8 μ M, the length direction of the positioning flat key 5 is in clearance fit with the length direction of the motor shaft 1, and two ends of the length direction of the positioning flat key 5 are in the shape of guide arcs 9, so that the left helical pinion 2 and the right helical pinion 3 can be conveniently mounted for guiding.

Referring to fig. 4, the two flat key sides 6 of the positioning flat key 5 are in light interference connection with the two motor shaft keyway sides 7 in the form of R7/h6, because friction load is transmitted without depending on interference of the positioning flat key 5, the positioning flat key 5 only plays a role in positioning when the left-handed helical gear 2 and the right-handed helical gear 3 are installed, and is not responsible for transmitting torque in use, the torque transmitted by the left-handed helical gear 2 and the right-handed helical gear 3 is in interference fit with the outer circular conical surface of the motor shaft 1 by the inner conical surface of the left-handed helical gear 2 and the inner conical surface of the right-handed helical gear 3, the component forces in the axial direction of the motor shaft 1 received by the left-handed helical gear 2 and the right-handed helical gear 3 are mutually offset, the two flat key sides 6 of the positioning flat key 5 are in transition fit connection with the inner hole keyway sides 8 of the helical gears JS7/h6, the centering precision is high, and by adopting such a fit, after the left-handed helical gear 2 and the right-handed helical gear 3 are installed at the two ends of the motor shaft 1, the central lines of the end face tooth widths of the left-handed helical gear 2 and the right-handed helical gear 3 are all in the same cross section, and therefore the synchronism of the helical gears at the two ends is guaranteed.

Referring to fig. 2, the length of the motor shaft 1 is 2500mm, two small key grooves can be machined simultaneously by one-time installation on a machine tool, and machining precision is easy to guarantee.

The above detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art, and these changes are within the protection of the present invention and also within the protection scope of the present invention.