Slurry pump transmission structure with reduction gearbox directly connected with crankshaft

Abstract

The utility model discloses a slurry pump transmission structure with a reduction gearbox directly connected with a crankshaft. The slurry pump transmission structure comprises a slurry pump rack, the crankshaft is rotationally arranged in the slurry pump rack along the axis and comprises a shaft body; the crankshaft supports and the connecting rod connecting discs are arranged on the shaft body at intervals, the crankshaft supports are used for being connected with a mud pump rack, and the connecting rod connecting discs are used for being in transmission connection with mud pump connecting rods; the reduction gearbox is arranged on the outer side of the slurry pump rack, a box body is fixedly connected with the slurry pump rack through a connecting mechanism, and an output shaft of the reduction gearbox is in coaxial transmission connection with the input end of the crankshaft in a matched mode through a spline or crowned teeth or a coupler. The transmission efficiency of the slurry pump is comprehensively improved, the problems that a traditional slurry pump transmission system is low in efficiency and cannot adapt to the high-load working condition are solved, and the high-power and high-load development trend of the slurry pump can be easily adapted.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid pumps. More specifically, the utility model relates to a transmission structure of a mud pump with a directly-connected reduction box and a crankshaft. Background Art

[0002] In recent years, continuous breakthroughs have been made in the development of deep shale oil and gas. The requirements for drilling pressure and displacement have increased, posing higher demands on the adaptability, efficiency, and reliability of mud pumps.

[0003] In traditional mud pumps, the power is mostly transmitted to the small gear shaft of the mud pump through belt drive or chain drive by an electric motor. The small gear on the small gear shaft of the mud pump meshes with the large gear on the crankshaft to transmit the working torque to the crankshaft, thereby driving the mud pump to work. On the one hand, the transmission efficiency of belts and chains is low, and when used under high-load conditions, belt slipping and breakage are likely to occur, making it unable to adapt to the current development trend of high-power and high-load mud pumps. On the other hand, the transmission of the large and small gear pairs inside the mud pump will also cause a loss of mechanical efficiency.

[0004] To solve the above problems, it is necessary to design a transmission structure of a mud pump with a directly-connected reduction box and a crankshaft to improve the transmission efficiency and load-bearing capacity of the mud pump. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a transmission structure of a mud pump with a directly-connected reduction box and a crankshaft to solve the problems of low efficiency and inability to adapt to high-load conditions in the conventional mud pump transmission system.

[0006] To achieve these and other advantages in accordance with the present utility model, there is provided a transmission structure of a mud pump with a directly-connected reduction box and a crankshaft, comprising:

[0007] A mud pump frame;

[0008] A crankshaft rotatably arranged along its axis inside the mud pump frame, the crankshaft including a shaft body; a crankshaft support and a connecting rod connection disk spaced apart on the shaft body, the crankshaft support being configured to be connected to the mud pump frame, and the connecting rod connection disk being configured to be drivingly connected to a mud pump connecting rod;

[0009] A reduction box arranged outside the mud pump frame and the box body of which is fixedly connected to the mud pump frame through a connecting mechanism, and an output shaft of the reduction box is coaxially drivingly connected to an input end of the crankshaft through a spline or a drum tooth or a coupling.

[0010] Preferably, in the transmission structure of the mud pump with a directly-connected reduction box and a crankshaft, the connecting mechanism includes a first flange fixed on a side of the box body of the reduction box close to the output shaft, and the first flange is connected to the mud pump frame through bolts.

[0011] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, positioning stop openings that cooperate with each other are provided at the contact surface between the first flange and the mud pump frame.

[0012] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, a bearing seat is provided inside the mud pump frame; the crankshaft support is a cylindrical structure coaxially arranged with the shaft body, and its outer circular surface is rotationally connected to the bearing seat through a rolling bearing.

[0013] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, the connecting rod disc is a disc structure, and it is coaxially or non - coaxially arranged with the shaft body.

[0014] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, a first transmission mechanism is provided at the outer end of the output shaft of the speed reducer, and a second transmission mechanism is provided at the end of the shaft body of the crankshaft. The end of the shaft body is the input end of the crankshaft;

[0015] Wherein, splines or crowned teeth are provided on both the first transmission mechanism and the second transmission mechanism, and the first transmission mechanism and the second transmission mechanism are connected by splines or crowned teeth or a coupling for cooperative transmission.

[0016] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, the second transmission mechanism is integrally and fixedly connected to the input end of the crankshaft, or the second transmission mechanism is detachably connected to the input end of the crankshaft through a second flange.

[0017] Preferably, for the mud pump drive structure in which the speed reducer is directly connected to the crankshaft, when external splines or external crowned teeth are provided on the first transmission mechanism, internal splines are provided on the second transmission mechanism; when internal splines are provided on the first transmission mechanism, external splines or external crowned teeth are provided on the second transmission mechanism.

[0018] The present utility model has at least the following beneficial effects:

[0019] The present utility model optimizes the crankshaft structure, realizes the transmission connection between the shaft body and the connecting rod through the connecting rod disc, and at the same time realizes the direct transmission connection between the speed reducer and the crankshaft through the structural cooperation setting of the output shaft of the speed reducer and the input end of the crankshaft, avoiding the mechanical efficiency loss caused by the transmission of large and small gear pairs, improving the transmission efficiency and load - bearing stability between the speed reducer and the crankshaft. Thus, the transmission efficiency of the mud pump is comprehensively improved, solving the problems of low efficiency of the traditional mud pump transmission system and inability to adapt to high - load working conditions, and being beneficial to adapting to the development trend of high - power and high - load mud pumps.

[0020] Other advantages, objects and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. Description of the Drawings <^

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a transmission structure of a mud pump with a speed reducer directly connected to a crankshaft according to an embodiment of the present utility model;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the transmission structure of the mud pump with the speed reducer directly connected to the crankshaft according to another embodiment;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of the transmission structure of the mud pump with the speed reducer directly connected to the crankshaft according to another embodiment.

[0024] Description of the Reference Numerals in the Drawings:

[0025] 1. Mud pump frame; 2. Crankshaft; 2-1. Second transmission mechanism; 2-1-1. Spline / crowned teeth on the second transmission mechanism; 2-2. Crankshaft support; 2-3. Connecting rod disk; 3. Speed reducer; 3-1. Output shaft; 3-1-1. Spline / crowned teeth on the first transmission mechanism; 3-2. First flange; 3-2-1. Positioning stop; 3-3. Housing. Detailed Embodiments

[0026] The following further describes the present utility model in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0027] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials, unless otherwise specified, can all be obtained from commercial channels; in the description of the present utility model, the orientation or positional relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0028] As Figures 1-3 shown, the present utility model provides a transmission structure of a mud pump with a speed reducer directly connected to a crankshaft, including:

[0029] Mud pump frame 1;

[0030] The crankshaft 2 is rotatably arranged along its axis within the mud pump frame 1. The crankshaft 2 includes a shaft body, a crankshaft support 2-2, and a connecting rod connecting disc 2-3, which are spaced apart on the shaft body. The crankshaft support 2-2 is configured to be connected to the mud pump frame 1, and the connecting rod connecting disc 2-3 is configured to be in transmission connection with the mud pump connecting rod.

[0031] The reduction gearbox 3 is arranged outside the mud pump frame 1, and the box body 3-3 thereof is fixedly connected to the mud pump frame 1 through a connecting mechanism. The output shaft 3-1 of the reduction gearbox is in coaxial transmission connection with the input end of the crankshaft through a spline, or a crowned gear, or a coupling.

[0032] In the above technical solution, the crankshaft 2 is installed within the mud pump frame 1 through the crankshaft support 2-2. The mud pump frame 1 provides support for the crankshaft, and at the same time, the crankshaft 2 can rotate relative to the mud pump frame 1. The output shaft 3-1 of the reduction gearbox is connected to the input end of the crankshaft to transmit the working torque to the crankshaft 2. The box body 3-3 of the reduction gearbox is fixedly connected to the mud pump frame 1 through a connecting mechanism to provide the working reaction torque. Among them, the input end of the crankshaft is arranged at the end position of the shaft body. The box body 3-3 of the reduction gearbox is installed outside the mud pump frame 1, and the crankshaft 2 is installed within the mud pump frame 1 (the input end of the crankshaft extends out of the frame range). The installation positions of the two on the mud pump frame need to meet the following requirements: the output shaft 3-1 of the reduction gearbox is aligned with the input end of the crankshaft and can be in transmission connection.

[0033] In actual work, the output shaft 3-1 of the reduction gearbox transmits the working torque to the input end of the crankshaft, driving the overall rotation of the crankshaft 2. The connecting rod connecting disc 2-3 on the crankshaft transmits the torque to the mud pump connecting rod. Here, the output shaft 3-1 of the reduction gearbox and the input end of the crankshaft are in coaxial transmission connection through a spline, or a crowned gear, or a coupling. This transmission method mainly relies on the cooperation of the end structures of the shafts, does not require the setting of additional mechanisms such as belts and chains, and does not require transmission through the meshing of large and small gear pairs, effectively improving the transmission efficiency between the reduction gearbox and the crankshaft, and at the same time reducing the negative impact of high-load working conditions on the transmission components. In addition, the structure of the crankshaft is optimized. The mud pump frame provides rotatable support for the shaft body through the crankshaft support, and the transmission connection between the shaft body and the connecting rod is realized through the connecting rod connecting disc, further ensuring the transmission efficiency and transmission stability.

[0034] In another technical solution, for the mud pump transmission structure where the reduction gearbox is directly connected to the crankshaft, the connecting mechanism includes a first flange 3-2, which is fixed on one side of the box body 3-3 of the reduction gearbox close to the output shaft 3-1. The first flange 3-2 is connected to the mud pump frame 1 through bolts. In the above technical solution, a plurality of bolt holes are arranged at intervals along the circumferential direction on the end face of the first flange 3-2, and a plurality of mounting holes are correspondingly arranged on the connection surface (outer side wall) between the mud pump frame 1 and the first flange 3-2. When installing the reduction gearbox 3, the positioning of the box body 3-3 on the mud pump frame 1 is achieved by aligning the bolt holes with the mounting holes, and then the bolts are screwed into the corresponding bolt holes one by one and locked in the mounting holes, thus completing the assembly of the reduction gearbox 3 and the mud pump frame 1. The bolt holes are arranged along the axial direction of the first flange. After the assembly is completed, the corresponding bolt holes and mounting holes are coaxially and continuously arranged.

[0035] In addition, to ensure the positioning accuracy, in addition to the bolt holes, a plurality of positioning holes (the positioning holes and bolt holes are arranged alternately) are arranged at intervals along the circumferential direction on the end face of the first flange 3-2, and a plurality of limiting holes are also correspondingly arranged on the connection surface between the mud pump frame 1 and the first flange 3-2. During installation, the positioning pins are sequentially inserted into the corresponding positioning holes and limiting holes, and then the corresponding bolt holes and mounting holes are aligned and locked with bolts. In this way, the reduction gearbox and the mud pump frame can be positioned and locked together by the positioning pins and bolts, further improving the assembly stability and ensuring the working stability of the transmission structure. The positioning holes are arranged along the axial direction of the first flange. After the assembly is completed, the corresponding positioning holes and limiting holes are coaxially and continuously arranged.

[0036] In another technical solution, for the mud pump transmission structure where the reduction gearbox is directly connected to the crankshaft, mating positioning stop mouths are provided at the contact surface between the first flange 3-2 and the mud pump frame 1. Among them, positioning stop mouths 3-2-1 are provided on both the first flange and the mud pump frame. In this embodiment, the positioning stop mouth 3-2-1 is an annular inclined plane provided on the connection end face (contact surface), enabling the reduction gearbox to be quickly positioned through the cooperation of the positioning stop mouths when initially aligning with the mud pump frame (not installed). After the alignment is completed, the two positioning stop mouths are mutually attached and clamped, facilitating the subsequent rapid assembly of the first flange (reduction gearbox) by means of bolts or bolts + positioning pins.

[0037] In another technical solution, for the mud pump transmission structure where the reduction gearbox is directly connected to the crankshaft, a bearing seat is provided inside the mud pump frame 1; the crankshaft support 2-2 is a cylindrical structure coaxially arranged with the shaft body, and its outer cylindrical surface is rotationally connected with the bearing seat through a rolling bearing. Among them, multiple crankshaft supports 2-2 can be provided, which are arranged at intervals along the length direction on the shaft body and integrally formed with it. The outer cylindrical surface (outer side wall) of any crankshaft support 2-2 is a cylindrical surface coaxially with the crankshaft axis, and its size is designed according to the rolling bearing to be installed on the bearing seat, so that the crankshaft support can be fitted into the rolling bearing in the bearing seat of the mud pump frame and fixedly connected with its inner ring, thereby realizing the stable support of the entire crankshaft by the mud pump frame 1, and at the same time enabling the crankshaft 2 to rotate smoothly on the mud pump frame 1.

[0038] In another technical solution, for the mud pump transmission structure where the reduction gearbox is directly connected to the crankshaft, the connecting rod connecting disc 2-3 is a disc structure, which is coaxially or non-coaxially arranged with the shaft body. Among them, multiple connecting rod connecting discs 2-3 can be provided, which are arranged at intervals along the length direction on the shaft body and integrally formed with it. The connecting rod connecting disc 2-3 can be installed with a shaft tile or a rolling bearing to smoothly transmit the movement of the crankshaft to the connecting rod. Specifically, when the connecting rod connecting disc is set as a non-coaxial disc structure with the shaft body (the axis of the shaft body), an integral eccentric disc structure can be adopted, or an eccentric wheel can be additionally sleeved outside the circular connecting disc to achieve the same effect.

[0039] In another technical solution, for the mud pump transmission structure where the reduction gearbox is directly connected to the crankshaft, a first transmission mechanism is provided at the outer end of the output shaft 3-1 of the reduction gearbox, and a second transmission mechanism 2-1 is provided at the end of the shaft body of the crankshaft 2, and the end of the shaft body is the input end of the crankshaft;

[0040] Among them, splines or drum-shaped teeth are provided on both the first transmission mechanism and the second transmission mechanism 2-1 (i.e., the splines / drum-shaped teeth 3-1-1 on the first transmission mechanism and the splines / drum-shaped teeth 2-1-1 on the second transmission mechanism), and the first transmission mechanism is in transmission connection with the second transmission mechanism 2-1 through splines or drum-shaped teeth or a coupling.

[0041] In the above technical solution, the end of the shaft body provided with the second transmission mechanism 2-1 is the input end of the crankshaft. Both the first and second transmission mechanisms are of sleeve type structures, and splines or crowned teeth are continuously provided along the circumferential direction on their inner or outer circular surfaces. Thus, when the reduction gearbox is connected to the crankshaft, under the limiting action of the mud pump frame 1, the output shaft 3-1 of the reduction gearbox and the input end of the crankshaft that are arranged opposite (coaxial) to each other can be sleeved with each other and then be connected by transmission through the cooperation of their own spline / crowned tooth structures (such as the cooperation of internal splines and external splines, the cooperation of internal splines and external crowned teeth); or, in the case where there is no sleeved relationship between the output shaft of the reduction gearbox and the input end of the crankshaft, the two coaxial sleeve structures can also be connected into one body through a coupling. At this time, the two ends of the coupling are respectively connected with the splines / crowned teeth 3-1-1 on the first transmission mechanism and the splines / crowned teeth 2-1-1 on the second transmission mechanism in a matching manner (such as the two ends of the coupling are provided with internal splines, which are connected by transmission with the external splines on the first and second transmission mechanisms).

[0042] In another technical solution, for the mud pump transmission structure in which the reduction gearbox is directly connected to the crankshaft, the second transmission mechanism 2-1 is integrally and fixedly connected to the input end of the crankshaft, or the second transmission mechanism 2-1 is detachably connected to the input end of the crankshaft through a second flange.

[0043] In the above technical solution, an example of the second transmission mechanism 2-1 being integrally and fixedly connected to the input end of the crankshaft is as Figures 1-2 shown.

[0044] An example of the second transmission mechanism 2-1 being detachably connected to the input end of the crankshaft through a second flange is as Figure 3 shown. At this time, the second transmission mechanism 2-1 and the shaft body are of a split structure. The second transmission mechanism 2-1 is connected to the end of the shaft body through a second flange (the second transmission mechanism and the second flange are integrated into one body). Among them, the second flange is used to realize the detachable connection with the shaft body, and the second transmission mechanism is used to realize the direct connection with the output shaft of the reduction gearbox. This method can effectively improve the setting flexibility of the power connection end. Specifically, a plurality of bolt holes or a plurality of positioning holes are alternately provided along the circumferential direction on the end face of the second flange. Any bolt hole or any positioning hole is arranged along the axial direction of the second flange and penetrates its front and rear end faces. At the same time, connection holes corresponding to the above bolt holes and positioning holes are also provided at the end of the shaft body. When installing the second transmission mechanism, passing a plurality of positioning pins through the corresponding positioning holes and connection holes can realize the precise alignment of the second flange and the shaft body, and then passing a plurality of bolts into the corresponding bolt holes and connection holes and tightening them can realize the firm connection between the second transmission mechanism and the end of the shaft body.

[0045] In another technical solution, for the transmission structure of the mud pump in which the speed reducer is directly connected to the crankshaft, when an external spline or external crowned teeth are provided on the first transmission mechanism, an internal spline is provided on the second transmission mechanism 2-1; when an internal spline is provided on the first transmission mechanism, an external spline or external crowned teeth are provided on the second transmission mechanism 2-1.

[0046] When the first transmission mechanism and the second transmission mechanism 2-1 are in transmission connection through the cooperation of their own splines or crowned teeth, adopting the above technical solution, wherein, the internal spline can be an internal involute spline or an internal rectangular spline, and the external spline can be an external involute spline or an external rectangular spline. In addition, when the first transmission mechanism and the second transmission mechanism are connected by a coupling, only the adaptation of the coupling to the splines or crowned teeth on the two transmission mechanisms needs to be considered.

[0047] In the first implementation mode, as Figure 1 shown, an internal spline is provided on the inner circular surface of the first transmission mechanism, and an external spline / external crowned teeth are provided on the outer circular surface of the second transmission mechanism 2-1. The inner circular diameter of the first transmission mechanism needs to be adapted to the outer circular diameter of the second transmission mechanism 2-1. The shape and size of the above internal spline need to be adapted to the above external spline / crowned teeth. After the connection is completed, the second transmission mechanism 2-1 is sleeved inside the first transmission mechanism and is in transmission connection with it.

[0048] In the second implementation mode, as Figure 2 shown, an external spline / external crowned teeth are provided on the outer circular surface of the first transmission mechanism, and an internal spline is provided on the inner circular surface of the second transmission mechanism 2-1. The outer circular diameter of the first transmission mechanism needs to be adapted to the inner circular diameter of the second transmission mechanism. The shape and size of the above external spline / crowned teeth need to be adapted to the above internal spline. After the connection is completed, the first transmission mechanism is sleeved inside the second transmission mechanism 2-1 and is in transmission connection with it.

[0049] Although the embodiments of the present invention have been disclosed as above, they are not limited to only the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A drive structure of a mud pump with a reduction gearbox directly connected to a crankshaft, characterized in that, Comprising: A mud pump frame; A crankshaft, which is rotatably arranged along an axis inside the mud pump frame. The crankshaft includes a shaft body, a crankshaft support, and a connecting rod connection disk, which are arranged at intervals on the shaft body. The crankshaft support is configured to be connected to the mud pump frame, and the connecting rod connection disk is configured to be in transmission connection with a mud pump connecting rod; A speed reducer, which is arranged outside the mud pump frame and the housing of which is fixedly connected to the mud pump frame through a connecting mechanism. The output shaft of the speed reducer is in coaxial transmission connection with the input end of the crankshaft through a spline, a crowned gear, or a coupling.

2. The mud pump drive structure with a speed reducer directly connected to a crankshaft as claimed in claim 1, wherein The connecting mechanism includes a first flange, which is fixed to one side of the housing of the speed reducer close to the output shaft, and the first flange is connected to the mud pump frame through bolts.

3. The mud pump drive structure with the reduction box directly connected to the crankshaft according to claim 2, characterized in that, A positioning stop is provided at the contact surface between the first flange and the mud pump frame.

4. The mud pump drive structure with a speed reducer directly connected to a crankshaft as described in claim 1, characterized in that, A bearing seat is provided inside the mud pump frame; the crankshaft support is a cylindrical structure coaxial with the shaft body, and the outer cylindrical surface thereof is in rotational connection with the bearing seat through a rolling bearing.

5. The mud pump drive structure with the reduction gearbox directly connected to the crankshaft as claimed in claim 1, wherein, The connecting rod connection disk is a disk structure, which is coaxial or non-coaxial with the shaft body.

6. The mud pump drive structure with the reduction gearbox directly connected to the crankshaft as described in claim 1, wherein, A first transmission mechanism is provided at the outer end of the output shaft of the speed reducer, and a second transmission mechanism is provided at the end of the shaft body of the crankshaft. The end of the shaft body is the input end of the crankshaft; Wherein, splines or crowned teeth are provided on both the first transmission mechanism and the second transmission mechanism, and the first transmission mechanism is in transmission connection with the second transmission mechanism through splines, crowned teeth, or a coupling.

7. The mud pump drive structure with the reduction gearbox directly connected to the crankshaft as described in claim 6, characterized in that, The second transmission mechanism is integrally and fixedly connected to the input end of the crankshaft, or the second transmission mechanism is detachably connected to the input end of the crankshaft through a second flange.

8. The mud pump drive structure with a speed reducer directly connected to a crankshaft according to claim 6, characterized in that, When external splines or external crowned teeth are provided on the first transmission mechanism, internal splines are provided on the second transmission mechanism; when internal splines are provided on the first transmission mechanism, external splines or external crowned teeth are provided on the second transmission mechanism.

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