Self-adaptive rod system structure of drilling pump

Abstract

The invention discloses a self-adaptive rod system structure of a drilling pump, which comprises a first connecting piece which is arranged between a crosshead and a middle pull rod and is used for connecting the crosshead and the middle pull rod into a whole, and a second connecting piece which is arranged between the middle pull rod and a piston rod and is used for connecting the middle pull rod and the piston rod into a whole, the first connecting piece and the second connecting piece are of a corner connecting structure or a translation connecting structure. The piston rod and the crosshead can be staggered by a certain distance and deflected by a certain angle through the translation connecting structure and the corner connecting structure, so that the rod system structure can adapt to the position and angle deviation between the axis of a cylinder sleeve and the axis of a guide plate or a rack hole, and finally the self-adaptive capacity of the rod system structure is improved; the problems of eccentric wear of a cylinder sleeve piston and eccentric wear of a crosshead guide plate of the drilling pump under the condition that translation and angle deviation of a cylinder sleeve axis and a rod system axis coexist are solved, the operation reliability of the drilling pump is improved, the service life of the pump is prolonged, the pump stopping maintenance frequency is reduced, and the construction efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drilling equipment. More particularly, the present application relates to a self-adaptive rod system structure of a drilling pump. BACKGROUND

[0002] In a conventional drilling pump structure, in order to ensure reliable operation of the drilling pump, it is necessary to ensure that the rod system composed of a crosshead, an intermediate rod, a piston rod and a piston is coaxial between each component rod, and after the rod system is assembled in the pump assembly, the axis of the rod system also needs to be coaxial with the axis of the cylinder sleeve.

[0003] In the rod system, each component rod is fixedly connected. This fixed connection has two shortcomings: firstly, the machining precision of each positioning related part of the drilling pump is required to be high, and the centering of the rod system to the cylinder sleeve needs to be adjusted during assembly, which requires higher manufacturing and assembly; secondly, during the operation of the drilling pump in the oilfield site, the centering state of the rod system adjusted during assembly is destroyed due to the wear of the crosshead and the guide plate, which easily causes eccentric wear of the piston or even damage to the rod system parts.

[0004] Although some drilling pump manufacturers have designed a ball joint connection structure for the rod system, a ball joint is designed in the rod system, which can only reduce the eccentric wear caused by the angle deviation between the cylinder sleeve axis and the rod system axis to a certain extent. In practice, the translation deviation and angle deviation of the cylinder sleeve axis and the rod system axis often coexist, and the eccentric wear cannot be completely avoided. SUMMARY

[0005] Another object of the present application is to provide a self-adaptive rod system structure of a drilling pump which can solve the eccentric wear problem of the cylinder sleeve and the piston of the drilling pump when the translation deviation and the angle deviation of the cylinder sleeve axis and the rod system axis coexist.

[0006] In order to achieve these objects and other advantages according to the present application, a self-adaptive rod system structure of a drilling pump is provided, which comprises a first connecting piece arranged between a crosshead and an intermediate rod for connecting the crosshead and the intermediate rod into a whole, and a second connecting piece arranged between the intermediate rod and a piston rod for connecting the intermediate rod and the piston rod into a whole, the first connecting piece and the second connecting piece being a rotation angle connecting structure or a translation connecting structure.

[0007] Preferably, it further comprises a connecting rod arranged between the intermediate rod and the piston rod, one end of the connecting rod being connected with the intermediate rod or the second connecting piece, and the other end of the connecting rod being connected with the second connecting piece or the piston rod.

[0008] Preferably, the rotation angle connecting structure comprises a spherical connecting disc and a rotation angle connecting clamp which are detachable from each other. The outer periphery of the spherical connecting plate is provided with a first bolt hole. One side wall of the spherical connecting plate is set as a plane, and the other side wall is set as a convex spherical structure. The convex spherical structure is connected to the bolt hole by cooperating with the concave spherical surface at the end of the middle tie rod. The corner connecting clamp is a circular ring structure. The outer circumference of the circular ring has a second bolt hole that matches the first bolt hole. The inner hole of the circular ring has a stepped cross-sectional shape, and the shape of the inner hole of the circular ring matches the outer circumferential shape of the end of the intermediate tie rod.

[0009] Preferably, the translational connection structure includes a connecting rod and a pressure plate that are detachable from each other; The connecting rod has a third bolt hole that matches the first bolt hole, and a first planar groove is provided on one side of the connecting rod. The inner diameter of the first planar groove is larger than the outer diameter of the piston rod head. The outer periphery of the pressure plate is provided with a fourth bolt hole that matches the third bolt hole, and the inner periphery of the pressure plate is provided with a connecting hole, the inner diameter of which is larger than the outer diameter of the piston rod.

[0010] Preferably, the connecting rod is a rod structure with one end being a flat surface and the other end having a second flat groove. The connecting rod has a fifth bolt hole that matches the first bolt hole, and the second flat groove has the same shape and size as the first flat groove.

[0011] Preferably, the convex spherical structure of the spherical connecting plate is provided with an oil groove, which is used to place lubricating grease.

[0012] The present invention includes at least the following beneficial effects: The present invention provides a corner connection structure or a translational connection structure at the connection between the crosshead and the intermediate tie rod. This allows the axis of the intermediate tie rod and the crosshead to be offset by a certain angle. Similarly, a corner connection structure or a translational connection structure is provided at the connection between the intermediate tie rod and the piston rod. This allows the axis of the piston rod and the intermediate tie rod to be misaligned by a certain distance. This enables the rod system structure to adapt to positional deviations between the cylinder liner axis and the axis of the guide plate or frame hole, ultimately improving the self-adaptive capability of the rod system structure. It solves the problem of uneven wear of the drilling pump cylinder liner piston and crosshead guide plate when both translational and angular deviations exist between the cylinder liner axis and the rod system axis, thereby improving the operational reliability of the drilling pump, extending the service life of the pump assembly, reducing the frequency of pump shutdowns for maintenance, and improving construction efficiency.

[0013] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the connection structure of the adaptive rod system structure for the drilling pump in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the connection structure of the adaptive rod system structure for the drilling pump in Embodiment 3 of the present invention; Figure 3 This is a schematic diagram of the connection structure of the drilling pump adaptive rod system in Embodiment 6 of the present invention; Figure 4 This is a schematic diagram of the connection structure between the corner connection structure and the intermediate tie rod of the present invention; Figure 5 This is a schematic diagram of the connection structure between the translational connection structure and the piston rod of the present invention; Explanation of reference numerals on the accompanying drawings: 1—Crosshead; 1-1—Crosshead positioning stop; 2—Intermediate tie rod; 2-1—Intermediate tie rod concave spherical surface; 3—Piston rod; 3-1—Piston rod flange outer circle; 3-2—Piston rod positioning plane; 3-3—Piston rod flange conical surface; 4—Piston; 5—Guide plate or frame hole; 6—Cylinder liner; 7—Corner connection structure; 7-1—Spherical connecting plate; 7-1-1—Convex spherical structure; 7-2—Corner connection clamp; 7-3—Bolt; 8—Translational connection structure; 8-1—Connecting rod; 8-2—First plane groove; 8-3—Pressure plate; 9—Connecting rod. Detailed Implementation

[0015] 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.

[0016] It should be noted that in the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 invention 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, they should not be construed as limitations on this invention.

[0017] like Figures 1-5 As shown, the present invention provides an adaptive rod system structure for a drilling pump, including a first connecting member disposed between the crosshead 1 and the intermediate tie rod 2 for connecting the crosshead 1 and the intermediate tie rod 2 into a whole, and a second connecting member disposed between the intermediate tie rod 2 and the piston rod 3 for connecting the intermediate tie rod 2 and the piston rod 3 into a whole. The first connecting member and the second connecting member are either a corner connection structure 7 or a translational connection structure 8.

[0018] In the above technical solution, a corner connection structure 7 or a translational connection structure 8 is provided at the connection between the crosshead 1 and the intermediate pull rod 2. The translational connection structure 8 allows the axes of the intermediate pull rod 2 and the crosshead 1 to be misaligned by a certain distance, or the corner connection structure 7 allows the axes of the intermediate pull rod 2 and the crosshead 1 to be tilted at a certain angle. Similarly, a corner connection structure 7 or a translational connection structure 8 is provided at the connection between the intermediate pull rod 2 and the piston rod 3. The translational connection structure 8 allows the axes of the piston rod 3 and the intermediate pull rod 2 to be misaligned by a certain distance, or... The use of the corner connection structure 7 allows the piston rod 3 and the intermediate tie rod 2 to be misaligned by a certain distance, thereby enabling the rod system structure to adapt to the positional and angular deviations between the axis of the cylinder liner 6 and the axis of the guide plate or frame hole 5. This ultimately improves the self-adaptive capability of the rod system structure, solves the problem of uneven wear of the drilling pump cylinder liner piston 4 and crosshead guide plate when both translational and angular deviations exist between the axis of the cylinder liner 6 and the axis of the rod system. This improves the operational reliability of the drilling pump, extends the service life of the pump assembly, reduces the frequency of pump shutdown maintenance, and improves construction efficiency.

[0019] In another technical solution, a connecting rod 9 is also included, which is disposed between the intermediate pull rod 2 and the piston rod 3. One end of the connecting rod 9 is connected to the intermediate pull rod 2 or the second connecting member, and the other end of the connecting rod 9 is connected to the second connecting member or the piston rod 3.

[0020] In another technical solution, the corner connection structure 7 includes a spherical connecting plate 7-1 and a corner connection clamp 7-2 that are detachable from each other; The outer periphery of the spherical connecting plate 7-1 is provided with a first bolt hole. One side wall of the spherical connecting plate 7-1 is set as a plane, and the other side wall is set as a convex spherical structure 7-1-1. The convex spherical structure 7-1-1 is connected to the concave spherical surface 2-1 at the end of the intermediate tie rod 2. An oil groove is provided on the convex spherical structure 7-1-1 of the spherical connecting plate 7-1 for placing lubricating grease. The corner connecting clamp 7-2 is a circular ring structure. The outer circumference of the circular ring is provided with a second bolt hole that matches the first bolt hole. The cross-sectional shape of the inner hole of the circular ring is stepped, and the shape of the inner hole of the circular ring matches the outer circumferential shape of the end of the intermediate tie rod 2.

[0021] In this technical solution, such as Figure 4As shown, the corner connection structure 7 consists of a spherical connecting plate 7-1 and a corner connection clamp 7-2, which can be assembled together by bolts 7-3. One side of the spherical connecting plate 7-1 is designed with a convex spherical structure 7-1-1, which allows the intermediate tie rod 2 connected to it to rotate around the center of the ball relative to the spherical connecting plate 7-1 at a certain angle. The shape of the inner hole of the annular ring of the corner connection clamp 7-2 is adapted to the outer circumferential shape of the end of the intermediate tie rod 2, which is used to limit the intermediate tie rod 2 to be located on the spherical connecting plate 7-1 to ensure connection stability. The convex spherical structure 7-1-1 and the concave spherical surface 2-1 are at the same center of the ball, and the center of the ball coincides with the axis of the crosshead 1. An oil groove is provided on the convex spherical structure 7-1-1 of the spherical connecting plate 7-1 to ensure that the intermediate tie rod 2 can rotate smoothly without jamming and to ensure the service life of the friction pair. The spherical connecting plate 7-1 and the corner connecting clamp 7-2 can be assembled or not, depending on the structural flexibility of the part they are connected to; the spherical connecting plate 7-1 can also be integrally formed with its adjacent parts according to actual application requirements.

[0022] In another technical solution, the translational connection structure 8 includes a mutually detachable connecting rod 8-1 and a pressure plate 8-3; The connecting rod 8-1 has a third bolt hole that matches the first bolt hole. A first planar groove 8-2 is provided on one side of the connecting rod 8-1. The inner diameter of the first planar groove 8-2 is larger than the outer diameter of the piston rod 3 head. The pressure plate 8-3 has a fourth bolt hole on its outer periphery that matches the third bolt hole, and a connecting hole on its inner periphery, the inner diameter of which is larger than the outer diameter of the piston rod 3.

[0023] In this technical solution, such as Figure 5 As shown, the translational connection structure 8 consists of a connecting rod 8-1 and a pressure plate 8-3 that can be assembled together by bolts 7-3. A first planar groove 8-2 is provided on the connecting rod 8-1. The rod head of the piston rod 3 can be placed in the first planar groove 8-2, and the piston rod positioning plane 3-2 fits against the first planar groove 8-2. The inner diameter of the first planar groove 8-2 is larger than the outer diameter of the flange 3-1 of the piston rod head, so that the piston rod 3 can move relative to the connecting rod 8-1 in a direction parallel to the plane of their fit. The pressure plate 8-3 can be... The piston rod 3 is fixed to the connecting rod 8-1 by bolt 7-3 to limit the piston rod 3, and can also transmit the return pull force to the piston rod 3 through the pressure plate 8-3 during the return stroke; at the same time, the rounded corner of the inner hole of the pressure plate 8-3 is in small clearance fit with the flange conical surface 3-3 of the piston rod 3, which can prevent the pressure plate 8-3 and the flange conical surface 3-3 of the piston rod 3 from getting stuck during the return stroke; the connecting rod 8-1 and the pressure plate 8-3 are used in the same way as the spherical connecting plate 7-1 and the corner connecting clamp 7-2, and can be assembled or not assembled, or can be integrally formed with adjacent parts.

[0024] In another technical solution, the connecting rod 9 is a rod structure with one end set as a plane and the other end having a second planar groove. The connecting rod 9 has a fifth bolt hole that matches the first bolt hole. The second planar groove has the same shape as the first planar groove 8-2.

[0025] In this technical solution, the second planar groove on the connecting rod 9 can also be used to connect with the piston rod 3, and the working thrust is transmitted through the connecting rod 9.

[0026] <Example 1> An adaptive rod system structure for drilling pumps, such as Figure 1 As shown, it includes a corner connection structure 7 set between the crosshead 1 and the intermediate tie rod 2, and a translational connection structure 8 set between the intermediate tie rod 2 and the piston rod 3. The crosshead 1 is installed on the guide plate or the frame hole 5. The piston rod 3 is fixedly connected to the piston 4. The piston 4 is set in the cylinder liner 6. The connection form of the crosshead 1, the corner connection structure 7, and the intermediate tie rod 2 is as follows: Figure 4 As shown, the first bolt hole on the spherical connecting plate 7-1 and the second bolt hole on the corner connecting clamp 7-2 of the corner connecting structure 7 are both adapted to the positioning stop 1-1 of the crosshead 1, which is used to limit the positional relationship between the spherical connecting plate 7-1, the corner connecting clamp 7-2 and the crosshead 1, so that the spherical connecting plate 7-1, the corner connecting clamp 7-2 and the crosshead 1 are aligned. The convex spherical surface 7-1-1 provided on the spherical connecting plate 7-1 is connected with the concave spherical surface 2-1 on the intermediate tie rod 2 to realize the connection between the spherical connecting plate 7-1 and the intermediate tie rod 2. The corner connecting clamp 7-2 is sleeved on the intermediate tie rod 2 to realize the limitation of the intermediate tie rod 2. The bolt 7-3 passes through the second bolt hole on the corner connecting clamp 7-2, the first bolt hole on the spherical connecting plate 7-1 and the positioning stop 1-1 of the crosshead 1 in sequence to realize the connection and fixation of the crosshead 1, the corner connecting structure 7 and the intermediate tie rod 2. The connection form of the intermediate tie rod 2, the translational connection structure 8, and the piston rod 3 is as follows: Figure 5 As shown, the end of the intermediate tie rod 2 without the concave spherical surface 2-1 is connected to the connecting rod 8-1 of the translational connection structure 8. The rod head of the piston rod 3 is accommodated in the first planar groove 8-2. The pressure plate 8-3 is sleeved on the piston rod 3 to limit the piston rod 3. An installation hole can be opened on the intermediate tie rod 2. The bolts 7-3 are passed through the fourth bolt hole on the pressure plate 8-3, the third bolt hole on the connecting rod 8-1, and the installation hole on the intermediate tie rod 2 in sequence to achieve the connection and fixation of the intermediate tie rod 2, the translational connection structure 8, and the piston rod 3. The connecting rod 8-1 can also be integrally formed with the intermediate tie rod 2.

[0027] <Example 2> An adaptive rod system structure for a drilling pump, which differs from Embodiment 1 in that the translational connection structure 8 is disposed between the crosshead 1 and the intermediate tie rod 2, and the corner connection structure 7 is disposed between the intermediate tie rod 2 and the piston rod 3; The connection of the crosshead 1, the translational connection structure 8, and the intermediate tie rod 2 is as follows: the third bolt hole on the connecting rod 8-1 of the translational connection structure 8 and the fourth bolt hole on the pressure plate 8-3 are adapted to the positioning stop 1-1 of the crosshead 1. The end of the intermediate tie rod 2 without the concave spherical surface 2-1 is accommodated in the first planar groove 8-2 of the connecting rod 8-1. The pressure plate 8-3 is sleeved on the intermediate tie rod 2 to limit the position of the intermediate tie rod 2. The bolts 7-3 pass through the fourth bolt hole on the pressure plate 8-3, the third bolt hole on the connecting rod 8-1, and the positioning stop 1-1 of the crosshead 1 in sequence to achieve the connection and fixation of the crosshead 1, the translational connection structure 8, and the intermediate tie rod 2. The connection of the intermediate tie rod 2, the corner connection structure 7, and the piston rod 3 is as follows: the intermediate tie rod 2 and the corner connection structure 7 are connected in the same way as in Example 1. The spherical connecting plate 7-1 of the corner connection structure 7 is integrated with the piston rod 3, thereby realizing the connection of the intermediate tie rod 2, the corner connection structure 7, and the piston rod 3.

[0028] <Example 3> An adaptive rod system structure for drilling pumps, such as Figure 2 As shown, the difference from Embodiment 1 is that the intermediate tie rod 2 is connected to the translational connection structure 8 through the connecting rod 9. The translational connection structure 8 only has the pressure plate 8-3 structure, and the rest of the connection form is the same as that in Embodiment 1. The connection of the intermediate tie rod 2, connecting rod 9, pressure plate 8-3, and piston rod 3 is as follows: the mounting hole of the intermediate tie rod 2 is adapted to the fifth bolt hole on the connecting rod 9 and the fourth bolt hole on the pressure plate 8-3; the rod head of the piston rod 3 is accommodated in the second plane groove of the connecting rod 9; the pressure plate 8-3 is sleeved on the piston rod 3 to limit the piston rod 3; and the connection and fixation of the intermediate tie rod 2, connecting rod 9, pressure plate 8-3, and piston rod 3 are achieved by the bolts 7-3 passing through the fourth bolt hole on the pressure plate 8-3, the fifth bolt hole on the connecting rod 9, and the mounting hole on the intermediate tie rod 2 in sequence.

[0029] <Example 4> A drilling pump adaptive rod system structure differs from Embodiment 1 in that a connecting rod 9 is provided between the translational connection structure 8 and the piston rod 3, while the rest of the connection form is the same as that of Embodiment 1. The connection of the translational connection structure 8, the connecting rod 9, and the piston rod 3 is as follows: the connecting rod 8-1 of the translational connection structure 8 is set between the intermediate tie rod 2 and the connecting rod 9; the pressure plate 8-3 of the translational connection structure 8 is sleeved on the piston rod 3; the rod head of the piston rod 3 is accommodated in the second plane groove of the connecting rod 9; and the connection and fixation of the translational connection structure 8, the connecting rod 9, and the piston rod 3 are achieved by the bolts 7-3 passing through the fourth bolt hole on the pressure plate 8-3, the fifth bolt hole on the connecting rod 9, and the third bolt hole on the connecting rod 8-1 in sequence.

[0030] <Example 5> A drilling pump adaptive rod system structure differs from Embodiment 2 in that the intermediate tie rod 2 is connected to the corner connection structure 7 via the connecting rod 9, while the rest of the connection forms are the same as in Embodiment 2. The connection of the intermediate tie rod 2, the connecting rod 9, and the corner connection structure 7 is as follows: the end of the intermediate tie rod 2 with the concave spherical surface 2-1 is welded to the connecting rod 9 without the second plane groove. The convex spherical surface on the spherical connecting plate 7-1 of the corner connection structure 7 is accommodated in the second plane groove. The corner connection clamp 7-2 is sleeved on the connecting rod 9. The intermediate tie rod 2, the connecting rod 9, and the corner connection structure 7 are connected and fixed by bolts 7-3 passing through the second bolt hole on the corner connection clamp 7-2, the first bolt hole on the spherical connecting plate 7-1, the fifth bolt hole on the connecting rod 9, and the mounting hole on the intermediate tie rod 2 in sequence.

[0031] <Example 6> An adaptive rod system structure for drilling pumps, such as Figure 3 As shown, the difference from Embodiment 2 is that the corner connection structure 7 is connected to the piston rod 3 through the connecting rod 9, and the rest of the connection is the same as that in Embodiment 2; The connection form of the corner connection structure 7, the connecting rod 9, and the piston rod 3 is as follows: the plane of the connecting rod 9 is connected to the corner connection structure 7 by bolts 7-3, and the piston rod 3 is accommodated in the second plane groove of the connecting rod 9. The piston rod 3 can be limited by the additional pressure plate 8-3 sleeved on the piston rod 3, or the piston rod 3 can be welded into the second plane groove to achieve the connection and fixation of the corner connection structure 7, the connecting rod 9, and the piston rod 3.

[0032] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A self-adapting rod string structure for a drilling pump, characterized by, The first connecting piece and the second connecting piece are a rotation angle connecting structure or a translation connecting structure.

2. The self-adapting rod string structure of a drilling pump of claim 1, wherein, The connecting rod is arranged between the intermediate pull rod and the piston rod, one end of the connecting rod is connected with the intermediate pull rod or the second connecting piece, and the other end of the connecting rod is connected with the second connecting piece or the piston rod.

3. The self-adapting rod string structure of a drilling pump of claim 1, wherein, The rotation angle connecting structure comprises a detachable spherical connecting disc and a rotation angle connecting clamp. The outer periphery of the spherical connecting disc is provided with a first bolt hole, one side wall of the spherical connecting disc is provided as a plane, and the other side wall is provided as a convex spherical surface structure, and the convex spherical surface structure is matched and connected with a concave spherical surface of an end of the intermediate pull rod through a bolt hole. The rotation angle connecting clamp is a circular ring structure, the outer periphery of the circular ring is provided with a second bolt hole matched with the first bolt hole, the inner hole section of the circular ring is in a stepped shape, and the shape of the inner hole of the circular ring is matched with the outer periphery shape of the end of the intermediate pull rod.

4. The self-adapting rod string structure of a drilling pump of claim 2, wherein, The translation connecting structure comprises a detachable connecting rod and a pressing plate. The connecting rod is provided with a third bolt hole matched with the first bolt hole, and one side of the connecting rod is provided with a first plane groove, and the inner diameter size of the first plane groove is greater than the outer diameter size of the piston rod head. The outer periphery of the pressing plate is provided with a fourth bolt hole matched with the third bolt hole, and the inner periphery of the pressing plate is provided with a through hole, and the inner diameter size of the through hole is greater than the outer diameter size of the piston rod.

5. The self-adapting rod string structure of a drilling pump of claim 4, wherein, The connecting rod is a rod structure provided with a plane at one end and a second plane groove at the other end, the connecting rod is provided with a fifth bolt hole matched with the first bolt hole, and the second plane groove is the same as the first plane groove.

6. The self-adapting rod string structure of a drilling pump of claim 3, wherein, The convex spherical surface structure of the spherical connecting disc is provided with an oil groove, and the oil groove is used for placing lubricating grease.

Images