A Mud Pump Based on External Gear Engagement

Abstract

The invention discloses a mud pump based on external gear meshing, and relates to the technical field of oil drilling. The mud pump comprises a pump casing, a conveying assembly and a transmission assembly. The conveying assembly comprises a cylinder sleeve and a piston, and the transmission assembly comprises an input gear set, a reciprocating disc and a transmission arm; the input gear set comprises a first gear and a second gear; the first gear is provided with a first shifting post; the second gear is provided with a second shifting post. The reciprocating disc is provided with a first mounting hole and a second mounting hole, the first shifting post is installed in the first mounting hole, and the second shifting post is installed in the second mounting hole. The transmission arm is provided with a transmission hole, the reciprocating disc is installed in the transmission hole, the reciprocating disc is rotationally connected to the transmission hole, and the piston is transmission-connected to the transmission arm. When the first gear and the second gear rotate, the first gear and the second gear drive the piston to perform linear reciprocating motion in the cylinder sleeve along the first direction. The mud pump provided by the invention has the advantages of small size, small wear of parts and components, and long service life.

Description

Technical Field

[0001] The present application relates to the technical field of oil drilling and production, and in particular to a mud pump based on external gear meshing. Background Art

[0002] As the core component of drilling equipment, the mud pump plays a key role in the circulation of drilling fluid.

[0003] The mud pump provided by the prior art adopts a crank slider mechanism, which has the problems of large size, easy wear of parts and components and short service life. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a mud pump based on external gear meshing, which has the advantages of small size, less wear on components and longer service life.

[0005] The embodiment of the present application provides a slurry pump based on external gear meshing, which includes a pump housing, a conveying assembly and a transmission assembly. A transmission chamber and an infusion chamber are provided in the pump housing, an inlet and an outlet are provided in the pump housing, both of which are connected to the infusion chamber, a first check valve is provided between the inlet and the infusion chamber, a second check valve is provided between the outlet and the infusion chamber, the first check valve allows the flow direction of the slurry to be from the inlet to the infusion chamber, and the second check valve allows the flow direction of the slurry to be from the infusion chamber to the outlet. The conveying assembly includes a cylinder sleeve and a piston, the cylinder sleeve is fixed in the pump housing, a piston chamber is formed in the cylinder sleeve, the piston chamber is connected to the infusion chamber, the piston is installed in the piston chamber, the piston is sealed and slidably connected to the inner wall of the piston chamber, and the piston can slide back and forth relative to the inner wall of the piston chamber in a first direction, and the first direction is parallel to the direction of the axis of the cylinder sleeve. The transmission assembly is installed in the transmission chamber, and includes an input gear set, a reciprocating disk and a transmission arm. The input gear set includes a first gear and a second gear. The first gear and the second gear have the same size, and the first gear and the second gear are arranged in a first direction and meshed externally; the first gear is provided with a first post on the side wall; the second gear is provided with a second post on the side wall, and the first post and the second post are both cylindrical structures, and the size of the first post is the same as the size of the second post; the axial direction of the first post is parallel to the axial direction of the first gear, and the axial direction of the second post is parallel to the axial direction of the second gear. The distance between the first post and the axis of the first gear is the same as the distance between the second post and the axis of the second gear. When the first gear rotates to the position where the distance between the first post and the second gear is the largest, the second gear rotates to the position where the distance between the second post and the first gear is the smallest. The reciprocating disk is a circular disk structure, and the radial direction of the reciprocating disk is parallel to the first direction. The reciprocating disk is provided with a first mounting hole and a second mounting hole corresponding to the first post and the second post, and the first post is mounted on the first mounting hole, and the second post is mounted on the second mounting hole. The first post can slide relative to the first mounting hole along the second direction; the second post can slide relative to the second mounting hole along the second direction; the second direction is the direction of the line between the first post and the second post. The axis of the transmission arm is arranged along the first direction, the transmission arm is provided with a transmission hole, the reciprocating disc is installed in the transmission hole, the reciprocating disc is rotationally connected with the transmission hole, and the piston is transmission-connected to the transmission arm. When the first gear and the second gear rotate, the first gear and the second gear drive the center of the reciprocating disc to make a linear reciprocating motion along the first direction through the first shifting column and the second shifting column, and the reciprocating disc drives the piston to make a linear reciprocating motion along the first direction in the cylinder sleeve through the transmission arm.

[0006] In a possible implementation of the present application, the piston is installed on the transmission arm.

[0007] In a possible implementation of the present application, the mud pump based on external gear meshing also includes a guide cylinder, which is fixed in the pump casing. A guide cavity is formed in the guide cylinder, and the axis of the guide cavity coincides with the axis of the cylinder sleeve. The transmission arm is provided with a guide portion, which is slidably connected to the inner wall of the guide cavity.

[0008] In a possible implementation of the present application, the mud pump based on external gear meshing further includes a transmission shaft, a first end of the transmission shaft is hinged to the transmission arm, and a piston is fixedly mounted on a second end of the transmission shaft.

[0009] In a possible implementation of the present application, the number of conveying assemblies and transmission assemblies are both multiple and equal; the conveying assemblies are arranged along the second direction, the transmission assemblies are arranged along the second direction, and the conveying assemblies and the transmission assemblies are arranged in a one-to-one correspondence; wherein the second direction is parallel to the axial direction of the first gear; each transmission assembly drives the piston of the corresponding conveying assembly to perform linear reciprocating motion in the corresponding cylinder sleeve along the first direction.

[0010] In a possible implementation of the present application, the number of conveying assemblies is twice the number of transmission assemblies; a conveying assembly is correspondingly arranged on both sides of the reciprocating disk of each transmission assembly along the first direction; each reciprocating disk simultaneously drives the pistons of the corresponding conveying assemblies on both sides through the transmission arm to perform linear reciprocating motion in the corresponding cylinder sleeve along the first direction.

[0011] Through the above arrangement, during the continuous rotation of the first gear or the second gear, the center of the reciprocating disk performs linear reciprocating motion along the first direction. Through the above arrangement, the rotation of the first gear or the second gear can be converted into the linear reciprocating motion of the center of the reciprocating disk. Further, the piston can be driven by the transmission arm to perform linear reciprocating motion in the cylinder sleeve along the first direction to realize the transportation of mud. Compared with the use of the crank slider mechanism in the related art to convert the rotation into linear reciprocating motion, the crank slider has a motion perpendicular to the first direction in addition to the linear reciprocating motion along the first direction. Therefore, the mud pump based on gear external meshing provided in the embodiment of the present application can reduce the volume occupied by the transmission mechanism, thereby reducing the volume of the mud pump. In addition, the mud pump based on gear external meshing provided in the embodiment of the present application does not use transmission parts such as a crosshead or a guide plate, which can reduce the number of wear parts of the mud pump based on gear external meshing provided in the embodiment of the present application, reduce the use of wearing parts, and can improve the overall life of the mud pump based on gear external meshing, reduce maintenance costs, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0013] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0014] Figure 1 A partial structural schematic diagram of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of the motion principle of a reciprocating disk of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0016] Figure 3 A schematic diagram of the arrangement of a transmission arm of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0017] Figure 4 A schematic diagram of the arrangement of a transmission arm of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0018] Figure 5 A partial structural schematic diagram of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0019] Figure 6 A partial structural schematic diagram of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0020] Figure 7 A schematic diagram of the structure of a mud pump based on external gear meshing provided in an embodiment of the present application;

[0021] Figure 8 This is an appearance diagram of a mud pump based on external gear meshing provided in an embodiment of the present application.

[0022] Reference numerals:

[0023] 1. Pump housing; 11. Transmission chamber; 12. Infusion chamber; 13. Inlet; 14. Outlet; 15. First check valve; 16. Second check valve; 17. Guide cylinder; 2. Conveying assembly; 21. Cylinder sleeve; 211. Piston chamber; 22. Piston; 3. Transmission assembly; 31. Input gear set; 311. First gear; 3111. First shifting post; 312. Second gear; 3121. Second shifting post; 32. Reciprocating disk; 321. First mounting hole; 322. Second mounting hole; 33. Transmission arm; 331. Transmission hole; 332. Guide part; 34. Transmission shaft. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the application embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of this application; it is obvious that the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0025] The mud pump is one of the important parts of the oil drilling rig and an important equipment in the drilling fluid circulation system. During drilling, the mud pump delivers high-viscosity, high-density and high-sand mud to the bottom of the well under high pressure to cool the drill bit, carry out rock cuttings, and serve as the power fluid for the bottom hole drilling tool to assist the drill bit in drilling. The performance level and service life of the mud pump directly affect the drilling speed and production cost.

[0026] The most common mud pump is a reciprocating mud pump. Compared with other types of mud pumps, the reciprocating mud pump can transport media with high viscosity and high sand content under high pressure, and has the advantage of stable flow rate. For reciprocating mud pumps, a crank slider mechanism is often used to convert the rotation of the motor into the reciprocating motion of the piston, which will cause the mud pump to have a large size, easy wear of parts and a short service life.

[0027] In view of this, an embodiment of the present application provides a mud pump based on external gear meshing, which has the advantages of small size, less wear of components and long service life.

[0028] Specifically, refer to Figure 1The mud pump based on external gear meshing provided in the embodiment of the present application includes a pump housing 1, a conveying assembly 2 and a transmission assembly 3. A transmission chamber 11 and an infusion chamber 12 are arranged in the pump housing 1, and an inlet 13 and an outlet 14 are arranged in the pump housing 1. The inlet 13 and the outlet 14 are both connected to the infusion chamber 12. A first check valve 15 is arranged between the inlet 13 and the infusion chamber 12, and a second check valve 16 is arranged between the outlet 14 and the infusion chamber 12. The first check valve 15 allows the mud to flow from the inlet 13 to the infusion chamber 12, and the second check valve 16 allows the mud to flow from the infusion chamber 12 to the outlet 14. The conveying component 2 includes a cylinder sleeve 21 and a piston 22. The cylinder sleeve 21 is fixed in the pump housing 1. A piston cavity 211 is formed in the cylinder sleeve 21. The piston cavity 211 is connected to the infusion cavity 12. The piston 22 is installed in the piston cavity 211. The piston 22 is sealed and slidably connected to the inner wall of the piston cavity 211. The piston 22 can slide back and forth relative to the inner wall of the piston cavity 211 along a first direction, and the first direction is parallel to the direction of the axis of the cylinder sleeve 21. The transmission assembly 3 is installed in the transmission cavity 11, and includes an input gear set 31, a reciprocating disk 32 and a transmission arm 33; the input gear set 31 includes a first gear 311 and a second gear 312; the first gear 311 and the second gear 312 have the same size, and the first gear 311 and the second gear 312 are arranged in a first direction and meshed externally; a first shifting post 3111 is provided on the side wall of the first gear 311; a second shifting post 3121 is provided on the side wall of the second gear 312, and the first shifting post 3111 and the second shifting post 3121 are both cylindrical structures, and the size of the first shifting post 3111 is the same as the size of the second shifting post 3121; the axial direction of the first shifting post 3111 is parallel to the axial direction of the first gear 311, and the axial direction of the second shifting post 3121 is parallel to the axial direction of the second gear 312; the distance between the first shifting post 3111 and the axis of the first gear 311 is the same as the distance between the second shifting post 3121 and the axis of the second gear 312. When the first gear 311 rotates to a position where the distance between the first lever 3111 and the second gear 312 is the largest, the second gear 312 rotates to a position where the distance between the second lever 3121 and the first gear 311 is the smallest. The reciprocating disk 32 is a circular disk-shaped structure, and the radial direction of the reciprocating disk 32 is parallel to the first direction. The reciprocating disk 32 is provided with a first mounting hole 321 and a second mounting hole 322 corresponding to the first lever 3111 and the second lever 3121. The first lever 3111 is mounted on the first mounting hole 321, and the second lever 3121 is mounted on the second mounting hole 322. The first lever 3111 can slide relative to the first mounting hole 321 along the second direction; the second lever 3121 can slide relative to the second mounting hole 322 along the second direction; the second direction is the direction of the line between the first lever 3111 and the second lever 3121.The axis of the transmission arm 33 is arranged along the first direction, the transmission arm 33 is provided with a transmission hole 331, the reciprocating disk 32 is installed in the transmission hole 331, the reciprocating disk 32 is rotationally connected to the transmission hole 331, and the piston 22 is transmission-connected to the transmission arm 33; when the first gear 311 and the second gear 312 rotate, the first gear 311 and the second gear 312 drive the center of the reciprocating disk 32 to make a linear reciprocating motion along the first direction through the first shifting post 3111 and the second shifting post 3121, and the reciprocating disk 32 drives the piston 22 to make a linear reciprocating motion along the first direction in the cylinder sleeve 21 through the transmission arm 33.

[0029] It should be noted that in the embodiment of the present application, the specific structural form of the pump housing 1 is not limited, and the pump housing 1 can provide an installation base for the conveying assembly 2 and the transmission assembly 3, and form a circulation channel for the mud. For example, the main structure of the pump housing 1 can be set as a columnar shell structure, or the pump housing 1 can be set as a cubic box structure.

[0030] It should be noted that a cavity is formed in the pump housing 1, and the cavity can be divided into a transmission cavity 11 and an infusion cavity 12 according to the installation positions of the conveying component 2 and the transmission component 3 in the pump housing 1. The transmission cavity 11 can be used to install the transmission component 3, and the infusion cavity 12 can be used for conveying mud.

[0031] On this basis, an inlet 13 and an outlet 14 may be provided on the pump housing 1 , so that a liquid inlet channel is formed between the inlet 13 and the infusion cavity 12 , and a liquid outlet channel is formed between the outlet 14 and the infusion cavity 12 .

[0032] Furthermore, in the embodiment of the present application, a first check valve 15 is provided between the inlet 13 and the infusion chamber 12 , and a second check valve 16 is provided between the outlet 14 and the infusion chamber 12 , and on this basis, the mud can be transported in coordination with the reciprocating motion of the piston 22 .

[0033] It should be noted that, refer to Figure 1 In order to improve the sealing effect of the first check valve 15 and the second check valve 16, the first check valve 15 and the second check valve 16 can be set as spring-type check valves.

[0034] The first check valve 15 and the second check valve 16 can limit the flow direction of the mud, so that the mud can only flow in a specific direction. Figure 1 The first check valve 15 allows the mud to flow from the inlet 13 to the infusion cavity 12 ; the second check valve 16 allows the mud to flow from the infusion cavity 12 to the outlet 14 .

[0035] For example, refer to Figure 1 ,by Figure 1The relative position in is used as an example for explanation. When the piston 22 moves from left to right, the valve core of the first check valve 15 moves upward away from the valve seat of the first check valve 15, the first check valve 15 is in an open state, the valve core of the second check valve 16 is close to the valve seat of the second check valve 16, and the second check valve 16 is in a closed state. At this time, the mud enters the infusion cavity 12 from the inlet 13; when the piston 22 moves from right to left, the valve core of the first check valve 15 is close to the valve seat of the first check valve 15, the first check valve 15 is in a closed state, the valve core of the second check valve 16 moves upward away from the valve seat of the second check valve 16, and the second check valve 16 is in an open state. At this time, the mud is transported from the infusion cavity 12 to the outlet 14. During the reciprocating motion of the piston 22, the above process is repeated to achieve the transportation of the mud.

[0036] It should be noted that in the embodiment of the present application, the cylinder liner 21 and the pump casing 1 can be arranged as an integral structure, or the cylinder liner 21 and the pump casing 1 can be arranged as a separate structure and then the cylinder liner 21 is installed in the pump casing 1. In this way, when the cylinder liner 21 is severely worn, the cylinder liner 21 can be easily replaced.

[0037] Reference Figure 1 It can be considered that the cylinder sleeve 21 is a hollow structure, and a piston cavity 211 is formed in the cylinder sleeve 21. The piston 22 can slide back and forth in the piston cavity 211. For the convenience of description, the direction of the reciprocating sliding of the piston 22 can be called a first direction, which is also parallel to the direction where the axis of the cylinder sleeve 21 is located.

[0038] Reference Figure 1 and Figure 2 , it can be considered that the first gear 311 and the second gear 312 are external meshing gears, and the first gear 311 and the second gear 312 have the same size and specification, and it can be considered that one of the first gear 311 and the second gear 312 is copied from the other.

[0039] In addition, in the embodiment of the present application, an input shaft may be provided on the first gear 311 or the second gear 312 so that the first gear 311 or the second gear 312 may be driven to rotate by a motor through the input shaft.

[0040] Reference Figure 1 For the convenience of description, the arrangement direction between the first gear 311 and the second gear 312 may be referred to as the first direction. The first direction may also be considered as the direction of the line between the axis of the first gear 311 and the axis of the second gear 312. Figure 1 ,exist Figure 1 , the first direction refers to the horizontal direction.

[0041] On this basis, in the embodiment of the present application, a first shifting post 3111 is disposed on the side wall of the first gear 311 , and a second shifting post 3121 is disposed on the side wall of the second gear 312 .

[0042] It should be noted that in the embodiment of the present application, the first gear 311 has two opposite side walls, and the second gear 312 has two opposite side walls. The side wall of the first gear 311 provided with the first shifting post 3111 and the side wall of the second gear 312 provided with the second shifting post 3121 are located on the same side of the input gear set 31.

[0043] For example, refer to Figure 1 and Figure 2 The side wall of the first gear 311 is disposed on the first lever 3111 and is located on the side perpendicular to the paper surface and outward, and the side wall of the second gear 312 is disposed on the second lever 3121 and is also located on the side perpendicular to the paper surface and outward.

[0044] It should be noted that, in the embodiment of the present application, the first lever 3111 can be set to a cylindrical structure, and the second lever 3121 can also be set to a cylindrical structure, and the sizes of the first lever 3111 and the second lever 3121 can be set to be the same. It should be noted that the same size of the first lever 3111 and the second lever 3121 means that the diameters of the first lever 3111 and the second lever 3121 are the same, and the heights of the first lever 3111 and the second lever 3121 are also the same. By adaptively setting the axial directions of the first lever 3111 and the second lever 3121, the axial direction of the first lever 3111 can be parallel to the axial direction of the first gear 311, and the axial direction of the second lever 3121 can be parallel to the axial direction of the second gear 312.

[0045] On this basis, by adaptively setting the position of the first lever 3111 relative to the first gear 311 and the position of the second lever 3121 relative to the second gear 312, the distance between the first lever 3111 and the axis of the first gear 311 and the distance between the second lever 3121 and the axis of the second gear 312 can be made the same.

[0046] Through the above configuration, it can be considered that the configurations of the first gear 311 and the first shifting post 3111 as well as the second gear 312 and the second shifting post 3121 are the same, and the second gear 312 and the second shifting post 3121 can be copied from the first gear 311 and the first shifting post 3111 .

[0047] In this way, when manufacturing the first gear 311 and the first shifting post 3111 as well as the second gear 312 and the second shifting post 3121 , it is not necessary to distinguish the first gear 311 from the second gear 312 , which facilitates manufacturing.

[0048] On this basis, by adaptively adjusting the relative meshing position of the first gear 311 and the second gear 312, when the first gear 311 rotates to the position where the distance between the first lever 3111 and the second gear 312 is the largest, the second gear 312 also rotates to the position where the distance between the second lever 3121 and the first gear 311 is the smallest.

[0049] Reference Figure 2 ,by Figure 2 For details, refer to Figure 2 When the first gear 311 rotates to the position where the first lever 3111 is located at the leftmost end of the first gear 311, the second gear 312 rotates to the position where the second lever 3121 is located at the leftmost end of the second gear 312; when the first gear 311 rotates to the position where the first lever 3111 is located at the rightmost end of the first gear 311, the second gear 312 rotates to the position where the second lever 3121 is located at the rightmost end of the second gear 312.

[0050] It should be noted that when the first gear 311 and the second gear 312 are meshed and rotated, the relative positions of the first shifting post 3111 and the second shifting post 3121 are also changing.

[0051] On this basis, the reciprocating disk 32 can be used to convert the motions of the first shifting post 3111 and the second shifting post 3121. Specifically, the reciprocating disk 32 is a circular disk structure, and the reciprocating disk 32 can be set as a hollow structure or a non-hollow structure, which is not limited in the embodiment of the present application.

[0052] Specifically, refer to Figure 1 and Figure 2 A first mounting hole 321 and a second mounting hole 322 may be provided on the reciprocating disk 32 , and the first shifting post 3111 may be installed in the first mounting hole 321 , and the second shifting post 3121 may be installed in the second mounting hole 322 .

[0053] The size of the first mounting hole 321 can be set larger than the size of the first lever 3111, so that a first sliding gap is set along the second direction between the first mounting hole 321 and the first lever 3111; and a second sliding gap is set along the second direction between the second lever 3121 and the second mounting hole 322. It should be noted that the second direction mentioned above refers to the direction of the line between the first lever 3111 and the second lever 3121, and the specific direction of the second direction also changes during the rotation of the first gear 311 and the second gear 312.

[0054] Illustratively, in the embodiment of the present application, the first mounting hole 321 and the second mounting hole 322 may be configured as circular holes, rectangular holes, or oblong holes.

[0055] Specifically, refer to Figure 2 , you can follow Figure 2 In the manner shown, the first mounting hole 321 and the second mounting hole 322 are set as oblong holes. Moreover, the width of the oblong hole is set to be the same as the diameter of the first lever 3111 or the second lever 3121, so that the diameter of the arc at both ends of the oblong hole is the same as the diameter of the first lever 3111 or the second lever 3121.

[0056] Reference Figure 2 When the first gear 311 and the second gear 312 are engaged and rotated, the first gear 311 and the second gear 312 drive the reciprocating disk 32 to rotate through the first lever 3111 and the second lever 3121, and also have a linear motion along the first direction. For the center of the reciprocating disk 32, the center of the reciprocating disk 32 performs a linear reciprocating motion along the first direction.

[0057] For example, refer to Figure 2 , is a schematic diagram of the motion principle of the transmission mechanism provided in the embodiment of the present application. Figure 2 Take the relative position in as an example to illustrate.

[0058] exist Figure 2 In the first figure, the first shifting post 3111 rotates to the leftmost end of the first gear 311, and the second shifting post 3121 rotates to the leftmost end of the second gear 312. At this time, the reciprocating disk 32 is located at the leftmost end.

[0059] When the first gear 311 rotates 90° clockwise, the Figure 2 In the position shown in the second figure in FIG, the first lever 3111 rotates to the uppermost end of the first gear 311, and the second lever 3121 rotates to the lowermost end of the second gear 312. At this time, the reciprocating disk 32 moves to the right while rotating. With the center of the reciprocating disk 32 as the observation object, the center of the reciprocating disk 32 moves to the right in the horizontal direction.

[0060] When the first gear 311 continues to rotate 90° clockwise, the Figure 2 In the position shown in the third figure, the first lever 3111 rotates to the rightmost end of the first gear 311, and the second lever 3121 rotates to the rightmost end of the second gear 312. At this time, the reciprocating disk 32 moves to the right while rotating. With the center of the reciprocating disk 32 as the observation object, the center of the reciprocating disk 32 moves to the right in the horizontal direction.

[0061] When the first gear 311 continues to rotate 90° clockwise, the Figure 2In the position shown in the fourth figure, the first lever 3111 rotates to the bottom of the first gear 311, and the second lever 3121 rotates to the top of the second gear 312. At this time, the reciprocating disk 32 moves to the left side during the rotation. With the center of the reciprocating disk 32 as the observation object, the center of the reciprocating disk 32 moves to the left side in the horizontal direction.

[0062] When the first gear 311 continues to rotate 90° clockwise, the Figure 2 The position shown in the first picture.

[0063] On this basis, in the mud pump based on external gear meshing provided in the embodiment of the present application, the transmission arm 33 can be used to transmit the linear reciprocating motion of the center of the reciprocating disk 32 .

[0064] It should be noted that, in the embodiment of the present application, the specific structural form of the transmission arm 33 is not limited. Figure 3 , the transmission arm 33 can be set to a rod-shaped structure, and a transmission hole 331 can be set on the transmission arm 33 to adapt to the reciprocating disk 32. Specifically, the size of the transmission hole 331 can be adaptively set according to the diameter of the reciprocating disk 32. Exemplarily, in an embodiment of the present application, the transmission hole 331 and the reciprocating disk 32 can be set to a direct contact rotation connection. At this time, the diameter of the transmission hole 331 can be set to be the same as the diameter of the reciprocating disk 32, or the diameter of the rotating hole can be slightly larger than the diameter of the reciprocating disk 32, so that the inner wall of the rotating hole and the reciprocating disk 32 can directly contact and rotate relative to each other. In addition, a bearing can be set between the rotating hole and the reciprocating disk 32 to further make the relative rotation between the reciprocating disk 32 and the transmission arm 33 smooth.

[0065] On this basis, the piston 22 can be connected to the transmission arm 33 , and the transmission arm 33 can be used to convert the linear reciprocating motion of the center of the reciprocating disk 32 into the linear reciprocating motion of the piston 22 .

[0066] In this way, during the continuous rotation of the first gear 311 or the second gear 312, the center of the reciprocating disk 32 performs linear reciprocating motion along the first direction. Through the above arrangement, the rotation of the first gear 311 or the second gear 312 can be converted into the linear reciprocating motion of the center of the reciprocating disk 32. Further, the piston 22 can be driven by the transmission arm 33 to perform linear reciprocating motion in the cylinder sleeve 21 along the first direction to realize the transportation of mud. Compared with the use of the crank slider mechanism in the related art to convert the rotation into linear reciprocating motion, the crank slider has not only the linear reciprocating motion along the first direction, but also the motion perpendicular to the first direction. Therefore, the mud pump based on the external gear meshing provided in the embodiment of the present application can reduce the volume occupied by the transmission mechanism, thereby reducing the volume of the mud pump. In addition, the mud pump based on the external gear meshing provided in the embodiment of the present application does not use transmission parts such as a crosshead or a guide plate, which can reduce the number of loss parts of the mud pump provided in the embodiment of the present application, reduce the use of wearing parts, and can improve the overall life of the mud pump, reduce maintenance costs, and improve work efficiency.

[0067] On this basis, in some embodiments of the present application, wear-resistant bushings are provided between the first shifting post 3111 and the first mounting hole 321 , and between the second shifting post 3121 and the second mounting hole 322 .

[0068] It should be noted that, in the embodiment of the present application, there is relative rotation between the first shift post 3111 and the first rotating hole, and there is relative rotation between the second shift post 3121 and the second rotating hole. By providing a wear-resistant bushing between the first shift post 3111 and the first mounting hole 321 and between the second shift post 3121 and the second mounting hole 322, the wear between the first shift post 3111 and the first mounting hole 321 and the wear between the second shift post 3121 and the second mounting hole 322 can be reduced, thereby further improving the service life of the transmission mechanism provided in the embodiment of the present application.

[0069] For example, in the embodiment of the present application, the wear-resistant bushing can be set to a cylindrical shell structure, and the wear-resistant bushing can be set between the first shifting post 3111 and the first mounting hole 321, and between the second shifting post 3121 and the second mounting hole 322. In addition, in the embodiment of the present application, the material of the wear-resistant bushing can be set to tungsten steel material, or the material of the wear-resistant bushing can be set to Stellite alloy, etc., which is not limited in the embodiment of the present application.

[0070] It should be noted that, in the embodiment of the present application, the transmission arm 33 may be connected to the piston 22 via other transmission mechanisms, or the piston 22 may be directly mounted on one end of the transmission arm 33 .

[0071] For example, refer to Figure 1 , you can follow Figure 1The piston 22 is mounted on the transmission arm 33 in the manner shown.

[0072] Through the above arrangement, in the mud pump based on external gear meshing provided in the embodiment of the present application, the piston 22 is directly mounted on the transmission arm 33, so that the connection between the piston 22 and the transmission arm 33 can be simple and convenient to set up.

[0073] In addition, refer to Figure 5 In some embodiments of the present application, a guide cylinder 17 may be provided in the mud pump based on external gear meshing to better limit the transmission arm 33 .

[0074] Specifically, in the embodiment of the present application, the mud pump based on external gear meshing also includes a guide cylinder 17, which is fixed in the pump housing 1. A guide cavity is formed in the guide cylinder 17, and the axis of the guide cavity coincides with the axis of the cylinder sleeve 21. The transmission arm 33 is provided with a guide portion 332, and the guide portion 332 is slidably connected to the inner wall of the guide cavity.

[0075] It should be noted that the guide cylinder 17 is a hollow structure with openings at both ends along the first direction. A guide cavity is formed in the guide cylinder 17 , and by adaptively arranging the position of the guide cylinder 17 in the pump housing 1 , the axis of the guide cavity can coincide with the axis of the cylinder sleeve 21 .

[0076] On this basis, a guide portion 332 may be provided on the transmission arm 33 , so that the guide portion 332 passes through the guide cavity, and the guide portion 332 is slidably connected to the inner wall of the guide cavity.

[0077] Through the above arrangement, the guide cylinder 17 can be used to limit the transmission arm 33, so that the transmission arm 33 can be better enabled to perform linear reciprocating motion along the first direction.

[0078] In addition, refer to Figure 6 In some embodiments of the present application, the mud pump based on external gear meshing further includes a transmission shaft 34 , one end of which is hinged to the transmission arm 33 , and the piston 22 is fixedly mounted on the other end of the transmission shaft 34 .

[0079] In this way, the hinge between the transmission shaft 34 and the transmission arm 33 can be used to buffer the transmission between the transmission arm 33 and the piston 22 .

[0080] In addition, in some embodiments of the present application, the number of conveying components 2 and transmission components 3 are both multiple and equal. The conveying components 2 are arranged along the second direction, and the transmission components 3 are arranged along the second direction, and the conveying components 2 and the transmission components 3 are arranged one by one. Among them, the second direction is parallel to the axial direction of the first gear 311. The input gear set 31 of each transmission component 3 is connected together by transmission so that each input gear set 31 can rotate synchronously. In this way, each transmission component 3 can drive the piston 22 of the corresponding conveying component 2 to reciprocate in the most straight line in the first direction in the corresponding cylinder sleeve 21.

[0081] For example, in the embodiment of the present application, the first gears 311 of all the transmission assemblies 3 can be connected together by a transmission shaft 34. In this way, each input gear set 31 can be kept to rotate synchronously.

[0082] On this basis, by providing a conveying assembly 2 corresponding to each transmission assembly 3, the transmission assembly 3 can be used to drive the piston 22 of the corresponding conveying assembly 2 to perform linear reciprocating motion in the corresponding cylinder sleeve 21 along the first direction.

[0083] In addition, refer to Figure 7 In some embodiments of the present application, the number of conveying assemblies 2 can also be set to twice the number of transmission assemblies 3. Specifically, the conveying assemblies 2 are arranged along the second direction, the transmission assemblies 3 are arranged along the second direction, and the conveying assemblies 2 are correspondingly arranged on both sides of the transmission assemblies 3 along the first direction; wherein the second direction is parallel to the axial direction of the first gear 311. The input gear sets 31 of each transmission assembly 3 are connected together by transmission so that each input gear set 31 can rotate synchronously. In this way, each transmission assembly 3 can drive the pistons 22 of the conveying assemblies 2 on both sides of it along the first direction to make linear reciprocating motion in the corresponding cylinder sleeve 21 along the first direction.

[0084] For example, refer to Figure 4 In the embodiment of the present application, a transmission hole 331 may be provided in the middle of the transmission arm 33 , and a piston 22 may be provided at each end of the transmission arm 33 .

[0085] Reference Figure 8 In some embodiments of the present application, by setting the number of the conveying assembly 2 and the transmission assembly 3 to three, the mud pump based on external gear meshing can form six hydraulic cylinders.

[0086] Through the above arrangement, in the mud pump based on external gear meshing provided in the embodiment of the present application, a reciprocating disk 32 can be used to simultaneously drive the two pistons 22 on both sides of the first direction to perform linear reciprocating motion along the first direction, so that the force on the reciprocating disk 32 can be more balanced and the movement of the reciprocating disk 32 can be more stable. At the same time, the work efficiency of the mud pump based on external gear meshing provided in the embodiment of the present application can also be further improved.

[0087] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the serial numbers of the above-mentioned steps / processes does not mean the order of execution, and the execution order of each step / process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments.

[0088] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0089] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A mud pump based on external gear meshing, characterized in that: include: A pump housing, wherein a transmission chamber and an infusion chamber are disposed in the pump housing, wherein the pump housing is provided with an inlet and an outlet, wherein the inlet and the outlet are both connected to the infusion chamber, wherein a first check valve is disposed between the inlet and the infusion chamber, wherein a second check valve is disposed between the outlet and the infusion chamber, wherein the first check valve allows the slurry to flow in a direction from the inlet to the infusion chamber, and wherein the second check valve allows the slurry to flow in a direction from the infusion chamber to the outlet; A delivery assembly, comprising a cylinder sleeve and a piston, wherein the cylinder sleeve is fixed in the pump housing, a piston cavity is formed in the cylinder sleeve, the piston cavity is connected to the infusion cavity, the piston is installed in the piston cavity, the piston is sealingly and slidably connected to the inner wall of the piston cavity, and the piston can reciprocate relative to the inner wall of the piston cavity along a first direction, wherein the first direction is parallel to the direction of the axis of the cylinder sleeve; A transmission assembly, installed in the transmission cavity, comprises an input gear set, a reciprocating plate and a transmission arm; the input gear set comprises a first gear and a second gear; the first gear and the second gear have the same size, the first gear and the second gear are arranged in the first direction and are externally meshed; a first shift post is arranged on the side wall of the first gear; a second shift post is arranged on the side wall of the second gear, the first shift post and the second shift post are both cylindrical structures, and the size of the first shift post is the same as that of the second shift post; the axial direction of the first shift post is parallel to the axial direction of the first gear, and the axial direction of the second shift post is parallel to the axial direction of the second gear; the distance between the first shift post and the axis of the first gear is the same as the distance between the second shift post and the axis of the second gear; when the first gear rotates to the position where the distance between the first shift post and the second gear is the largest, the second gear rotates to the position where the distance between the second shift post and the first gear is the smallest; The reciprocating disk is a circular disk-shaped structure, the radial direction of the reciprocating disk is parallel to the first direction, the reciprocating disk is provided with a first mounting hole and a second mounting hole corresponding to the first shifting post and the second shifting post, the first shifting post is mounted in the first mounting hole, the second shifting post is mounted in the second mounting hole, the first shifting post can slide relative to the first mounting hole along the second direction; the second shifting post can slide relative to the second mounting hole along the second direction; the second direction is the direction of the line between the first shifting post and the second shifting post; The axis of the transmission arm is arranged along the first direction, the transmission arm is provided with a transmission hole, the reciprocating disk is installed in the transmission hole, the reciprocating disk is rotatably connected to the transmission hole, and the piston is transmission-connected to the transmission arm; When the first gear and the second gear rotate, the first gear and the second gear drive the center of the reciprocating disk to perform linear reciprocating motion along the first direction through the first shifting post and the second shifting post, and the reciprocating disk drives the piston to perform linear reciprocating motion along the first direction in the cylinder sleeve through the transmission arm.

2. The mud pump based on external gear meshing according to claim 1, characterized in that: The piston is mounted on the transmission arm.

3. The mud pump based on external gear meshing according to claim 1, characterized in that: The transmission assembly also includes a guide cylinder, which is fixed in the pump housing. A guide cavity is formed in the guide cylinder, and the axis of the guide cavity coincides with the axis of the cylinder sleeve. The transmission arm is provided with a guide portion, and the guide portion is slidably connected to the inner wall of the guide cavity.

4. The mud pump based on external gear meshing according to claim 1, characterized in that: The transmission assembly also includes a transmission shaft, one end of which is hinged to the transmission arm, and the piston is fixedly mounted on the other end of the transmission shaft.

5. The mud pump based on external gear meshing according to claim 1, characterized in that: The number of the conveying components and the number of the transmission components are both multiple and equal; The conveying components are arranged along the second direction, the transmission components are arranged along the second direction, and the conveying components and the transmission components are arranged one by one; wherein the second direction is parallel to the axial direction of the first gear; The input gear sets of each transmission assembly are connected together in a transmission manner so that each input gear set can rotate synchronously; Each of the transmission components drives the piston of the corresponding conveying component to perform linear reciprocating motion along the first direction in the corresponding cylinder sleeve.

6. The mud pump based on external gear meshing according to claim 1, characterized in that: The number of the conveying components is twice the number of the transmission components; The conveying components are arranged along the second direction, the transmission components are arranged along the second direction, and the conveying components are correspondingly arranged on both sides of the transmission components along the first direction; wherein the second direction is parallel to the axial direction of the first gear; The input gear sets of each transmission assembly are connected together in a transmission manner so that each input gear set can rotate synchronously; Each of the transmission assemblies drives the pistons of the conveying assemblies on both sides along the first direction to perform linear reciprocating motion along the first direction in the corresponding cylinder sleeves.

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