Reciprocating pump crankshaft axial limiting connecting mechanism based on reduction gearbox planet carrier

Abstract

The utility model discloses a reciprocating pump crankshaft axial limiting connecting mechanism based on a reduction gearbox planet carrier, which comprises a reduction gearbox planet carrier, an output external spline is arranged on the outer side of the reduction gearbox planet carrier, a threaded hole is processed at the end part of the output external spline, and a spigot is reserved at the tail part of the output external spline; the spline sleeve is arranged on the outer side of the output outer spline in a sleeving mode, and an inner spline matched with the output outer spline is machined in the spline sleeve; the pressing plate is connected with the threaded hole in the end part of the output external spline through a pressing plate bolt; one end of the power input side of the reciprocating pump crankshaft is fixedly connected with the spline housing, a plurality of process holes are formed in a first crankshaft neck of the power input side of the reciprocating pump crankshaft, and the process holes are used for allowing pressing plate bolts to penetrate through; axial movement gaps are reserved between the spline housing and the pressing plate and between the spline housing and the seam allowance. The axial bearing capacity of the planetary herringbone gear of the planetary reduction gearbox is utilized, the axial displacement of the crankshaft is limited through the planet carrier, no relative rotation motion exists between the planet carrier and the crankshaft, and the risks of high temperature and abrasion failure caused by relative friction are completely eradicated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of petroleum drilling and production equipment, more specifically, the utility model relates to a reciprocating pump crankshaft axial limit connecting mechanism based on planetary carrier of reduction gearbox. BACKGROUND

[0002] Reciprocating pump is one of the key equipment of oil and gas exploitation series equipment, and is widely used in oil and gas engineering industry cementing, fracturing, drilling mud pump injection, water injection and other operations. Crankshaft is one of the core components of reciprocating pump, and the reliability of crankshaft axial limit mode plays a very key role in the normal operation of the equipment.

[0003] The commonly used crankshaft limit mode mainly has the following two structure forms:

[0004] The first kind is to realize the crankshaft limit by using a pair of NJ or NF type bearings, which are assembled on the output side and input side of the crankshaft. Similar to this is to use an NUP type bearing assembled on one side of the crankshaft, and to realize the axial limit of the crankshaft by one bearing. The above scheme is the most commonly used crankshaft axial limit mode at present. The advantage of this scheme is simple structure, but when the bearing is limited, the rollers will produce relative friction with the bearing outer steel tile fixed on the rack, which will reduce the service life of the bearing and even cause abnormal damage.

[0005] The second kind is to reserve a notch on the crankshaft by machining or assembling, and to insert a limit block into the notch and fix it on the rack, so as to limit the axial position of the crankshaft. This scheme has simple structure and can reduce the difficulty of bearing assembly, but the block and the crankshaft will produce relative friction, which also has the risk of high temperature and wear failure. INVENTION CONTENTS

[0006] The utility model aims at providing a reciprocating pump crankshaft axial limit connecting mechanism based on planetary carrier of reduction gearbox, which utilizes the axial bearing capacity of the planetary gear of the planetary reduction gearbox, limits the axial displacement of the crankshaft through the planetary carrier, and eliminates the risk of high temperature and wear failure caused by relative friction between the planetary carrier and the crankshaft.

[0007] The utility model adopts the technical scheme that provides a reciprocating pump crankshaft axial limit connecting mechanism based on planetary carrier of reduction gearbox, which comprises:

[0008] The planetary carrier of the reduction gearbox is provided with an output external spline on the outer side, the end of the output external spline is processed with a threaded hole, and the tail is reserved with a stop opening;

[0009] The spline sleeve is sleeved on the outer side of the output external spline, and the internal spline matched with the output external spline is processed in the internal spline;

[0010] A pressing plate is provided with a plurality of through holes, and the pressing plate bolts are connected with the threaded holes of the output outer spline end;

[0011] A reciprocating pump crankshaft is fixedly connected with the spline sleeve at the power input side, and a plurality of process holes are arranged on the first crankshaft journal of the power input side of the reciprocating pump crankshaft, and the process holes are used for penetrating the pressing plate bolts;

[0012] The spline sleeve is prearranged with axial movement gaps between the pressing plate and the stop opening.

[0013] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the planetary carrier is internally assembled with a planetary gear;

[0014] The planetary gear is a herringbone gear or a double helical gear combination structure, which is assembled by two helical gears with different rotation directions to form a herringbone tooth structure and is respectively engaged with a sun gear and an outer gear ring.

[0015] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the pressing plate is a circular ring structure or a sector structure.

[0016] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the output outer spline and the planetary carrier of the reduction gearbox are an integral structure or a split structure.

[0017] The reciprocating pump crankshaft and the spline sleeve are an integral structure or a split structure.

[0018] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the spline sleeve and the power input side of the reciprocating pump crankshaft are fixedly connected through bolts and bearing pins.

[0019] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the pressing plate bolt is a hexagonal bolt or an internal hexagonal bolt.

[0020] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the axial movement gap between the spline sleeve and the pressing plate is 0.25-2mm, and the axial movement gap between the spline sleeve and the stop opening is 0.25-2mm.

[0021] Preferably, the reciprocating pump crankshaft based on the planetary carrier of the reduction gearbox is characterized in that the thickness of the pressing plate is 6-20mm, and the pressing plate is uniformly distributed with 4-20 through holes.

[0022] The process holes and the threaded holes of the output outer spline are one-to-one corresponding, and the axes of the two coincide.

[0023] Preferably, the crankshaft axial position limiting connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox, a protrusion matched with the stop opening is arranged on the inner wall of the spline sleeve corresponding to the position of the stop opening, and the protrusion is embedded in the stop opening to limit the axial movement of the reciprocating pump crankshaft together with the pressing plate.

[0024] Preferably, the crankshaft axial position limiting connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox, the depth of the stop opening is 8-25 mm.

[0025] The utility model discloses at least the following beneficial effects: utilize planetary reduction gearbox planet level herringbone gear axial bearing capacity, through specific structure design, connect crankshaft and planetary carrier as a whole, utilize planetary carrier to limit the axial displacement of crankshaft. Compared with prior art, planetary carrier and crankshaft have no relative rotation, and there is no friction heating problem. Meanwhile, the theoretical axial force of crankshaft is very small, and has no influence on herringbone tooth bearing. The scheme can fundamentally eliminate the product quality problems caused by wear and failure of limiting bearing and limiting block in the use process of the existing crankshaft axial position limiting scheme.

[0026] Other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by those skilled in the art partly through the research and practice of the utility model. DRAWINGS

[0027] Figure 1 It is a structure schematic view of a crankshaft axial position limiting connection mechanism of a reciprocating pump based on the planetary carrier of the reduction gearbox;

[0028] Figure 2 It is a structure schematic view of the output spline end of the planetary carrier in the crankshaft axial position limiting connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox;

[0029] Figure 3 It is a structure schematic view of the pressing plate in the crankshaft axial position limiting connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox;

[0030] Figure 4 It is a structure schematic view of the first main journal process hole on the power input side of the reciprocating pump crankshaft in the crankshaft axial position limiting connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox;

[0031] The figure mark explanation: 1, reduction gearbox planetary carrier, 2, output outer spline, 3, screw hole, 4, stop opening, 5, spline sleeve, 6, pressing plate, 7, through hole, 8, pressing plate bolt, 9, reciprocating pump crankshaft, 10, first crank journal, 11, process hole, 12, planetary gear, 13, outer gear, 14, sun gear, 15, pump rack. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0033] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0034] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0035] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0036] like Figures 1-4 As shown, a preferred embodiment of this utility model provides an axial limiting connection mechanism for a reciprocating pump crankshaft based on a planetary gearbox carrier, comprising:

[0037] The planetary carrier 1 of the gearbox has an output external spline 2 on its outer side. The end of the output external spline 2 is machined with a threaded hole 3, and a stop 4 is reserved at the tail.

[0038] Spline sleeve 5 is fitted onto the outside of the output external spline 2, and the inside of the spline sleeve 5 is machined with an internal spline that mates with the output external spline 2;

[0039] The pressure plate 6 has several through holes 7, which are connected to the threaded hole 3 at the end of the output external spline 2 by pressure plate bolts 8;

[0040] The reciprocating pump crankshaft 9 is mounted on the pump frame 15 via bearings. One end of its power input side is fixedly connected to the spline sleeve 5. The reciprocating pump crankshaft 9 has several process holes 11 on the first crankshaft journal 10 on the power input side. The process holes 11 are used to pass through the pressure plate bolts 8.

[0041] The spline sleeve 5 and the pressing plate 6 and the stop 4 are provided with axial movement clearance.

[0042] The rotation power of the planetary carrier 1 of the reduction gearbox is transmitted to the spline sleeve 5 through the output external spline 2, and the spline sleeve 5 drives the reciprocating pump crankshaft 9 to rotate.

[0043] During assembly, the pressing plate 6 is placed between the reciprocating pump crankshaft 9 and the spline sleeve 5, and then the assembly of the spline sleeve 5, the reduction gearbox (including the planetary carrier 1 of the reduction gearbox) is completed in the normal order, and finally the connection between the pressing plate 6 and the output external spline 2 of the planetary carrier 1 of the reduction gearbox is completed through the process hole 11 on the first crankshaft journal 10 on the power input side of the reciprocating pump crankshaft 9 by the pressing plate bolt 8. After the assembly is completed, the spline sleeve 5 is provided with a certain axial movement clearance on both sides of the pressing plate 6 and the stop 4.

[0044] Further, the reciprocating pump crankshaft axial limiting connection mechanism based on the planetary carrier of the reduction gearbox is characterized in that the planetary carrier 1 is internally assembled with a planetary gear 12.

[0045] The planetary gear 12 is a herringbone gear or a double helical gear combination structure, which is assembled by two helical gears with different rotation directions to form a herringbone tooth structure, and is meshed with a sun gear 14 and an external gear 13 respectively, so as to improve the transmission stability and reduce the axial force fluctuation.

[0046] Further, the reciprocating pump crankshaft axial limiting connection mechanism based on the planetary carrier of the reduction gearbox is characterized in that the pressing plate 6 is a circular ring structure or a fan-shaped structure.

[0047] Further, the reciprocating pump crankshaft axial limiting connection mechanism based on the planetary carrier of the reduction gearbox is characterized in that the output external spline 2 and the planetary carrier 1 of the reduction gearbox are an integral structure or a split structure.

[0048] The reciprocating pump crankshaft 9 and the spline sleeve 5 are an integral structure or a split structure.

[0049] In the above technical solution, when the reciprocating pump crankshaft 9 and the spline sleeve 5 are an integral structure, the pressing plate 6 must be a fan-shaped structure.

[0050] Further, the reciprocating pump crankshaft axial limiting connection mechanism based on the planetary carrier of the reduction gearbox is characterized in that the spline sleeve 5 and the power input side of the reciprocating pump crankshaft 9 are fixedly connected through a bolt and a bearing pin, so as to realize the rigid transmission of the spline sleeve 5 and the reciprocating pump crankshaft 9.

[0051] Further, the reciprocating pump crankshaft axial limiting connection mechanism based on the planetary carrier of the reduction gearbox is characterized in that the pressing plate bolt 8 is a hexagonal bolt or an internal hexagonal bolt.

[0052] Further, the axial movement gap between the spline sleeve 5 and the pressing plate 6 is 0.25-2mm, and the axial movement gap between the spline sleeve 5 and the stop 4 is 0.25-2mm. The axial movement gap ensures power transmission without affecting normal movement and without frictional heating problems.

[0053] Further, the axial movement gap between the spline sleeve 5 and the pressing plate 6 is 0.25-2mm, and the axial movement gap between the spline sleeve 5 and the stop 4 is 0.25-2mm. The axial movement gap ensures power transmission without affecting normal movement and without frictional heating problems.

[0054] The process hole 11 corresponds to the threaded hole 3 of the output external spline 2 one by one, and the axes of the two coincide.

[0055] Further, the axial movement gap between the spline sleeve 5 and the pressing plate 6 is 0.25-2mm, and the axial movement gap between the spline sleeve 5 and the stop 4 is 0.25-2mm. The axial movement gap ensures power transmission without affecting normal movement and without frictional heating problems.

[0056] Further, the axial movement gap between the spline sleeve 5 and the pressing plate 6 is 0.25-2mm, and the axial movement gap between the spline sleeve 5 and the stop 4 is 0.25-2mm. The axial movement gap ensures power transmission without affecting normal movement and without frictional heating problems.

[0057] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and the figures shown and described herein.

Claims

1. A reciprocating pump crankshaft axial limit connecting mechanism based on a reduction gearbox planet carrier, characterized in that, The application relates to a planetary carrier of a reduction gearbox, which is provided with an output outer spline on the outer side, the end of the output outer spline is provided with a threaded hole, and a tail is provided with a stopper. A spline sleeve is sleeved on the outer side of the output outer spline, and the inner side of the spline sleeve is provided with an inner spline matched with the output outer spline. A pressing plate is provided with a plurality of through holes, and the pressing plate is connected with the threaded hole at the end of the output outer spline through a pressing plate bolt. A reciprocating pump crankshaft is fixedly connected with the spline sleeve at the power input side, a plurality of process holes are arranged on the first crankshaft journal at the power input side of the reciprocating pump crankshaft, and the process holes are used for penetrating the pressing plate bolt. The spline sleeve, the pressing plate and the stopper are all provided with axial movement gaps. The planetary carrier is internally provided with a planetary gear.

2. The crankshaft axial limit connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The planetary gear is a herringbone gear or a double helical gear combination structure, the double helical gear combination structure is assembled by two helical gears with different rotation directions, a herringbone tooth structure is formed, and the herringbone tooth structure is respectively engaged with a sun gear and an outer gear ring. The pressing plate is a circular ring structure or a sector structure.

3. The crankshaft axial limit connecting mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The output outer spline and the planetary carrier are an integral structure or a split structure.

4. The crankshaft axial limit connection mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The reciprocating pump crankshaft and the spline sleeve are an integral structure or a split structure. The spline sleeve and the reciprocating pump crankshaft at the power input side are fixedly connected through a bolt and a bearing pin.

5. The crankshaft axial stopper connecting mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The pressing plate bolt is a hexagonal bolt or an internal hexagonal bolt.

6. The crankshaft axial stop connection mechanism of a reciprocating pump based on a reduction gearbox planet carrier according to claim 1, characterized in that, The axial movement gap between the spline sleeve and the pressing plate is 0.25-2 mm, and the axial movement gap between the spline sleeve and the stopper is 0.25-2 mm.

7. The crankshaft axial stopper connecting mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The thickness of the pressing plate is 6-20 mm, and the pressing plate is uniformly provided with 4-20 through holes.

8. The crankshaft axial stopper connecting mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The process holes and the threaded holes of the output outer spline are one-to-one corresponding, and the axes of the process holes and the threaded holes coincide. The inner periphery of the spline sleeve is provided with a protrusion matched with the stopper at the position corresponding to the stopper, the protrusion is embedded in the stopper, and the protrusion limits the axial movement of the reciprocating pump crankshaft together with the pressing plate.

9. The crankshaft axial stopper connecting mechanism of the reciprocating pump based on the planetary carrier of the reduction gearbox according to claim 1, characterized in that, The depth of the stopper is 8-25 mm.

10. The crankshaft axial stop connection mechanism of a reciprocating pump based on a reduction gearbox planetary carrier according to claim 9, characterized in that, ​

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