Piston type continuous operation slurry pump

Abstract

The invention relates to the technical field of slurry pumps, and discloses a piston type continuous operation slurry pump which is composed of a power end and a fluid end. The power end converts rotary motion into push-pull type rotary swing of the connecting rod set through a crankshaft mechanism, and then the sliding block is driven to do linear reciprocating motion in the guide sleeve. The fluid end is provided with a vertical flow channel and a communicated valve cabin, and a valve bank capable of being opened and closed in a self-adaptive mode along with pressure and a cleaning rotary drum surrounding the valve bank are arranged in the valve cabin. The linear motion of the sliding block is transmitted to the upper and lower cleaning rotary drums on the same side through the connecting rod mechanism to drive the rotary drums to rotate and form continuous cleaning in the opening and closing process of the valve group; by means of the structure, space matching of axial movement and circumferential cleaning is achieved, solid particle deposition can be effectively prevented, the sealing performance of a valve set is guaranteed, and the volume efficiency and working stability of the slurry pump are maintained; the cleaning device further comprises a cleaning agent injection system capable of improving the cleaning effect and a split type structure convenient to overhaul.

Description

Technical Field

[0001] This invention relates to the field of mud pump technology, and more specifically to a piston-type continuous-run mud pump. Background Technology

[0002] Piston mud pumps are key equipment in drilling operations and belong to the category of positive displacement pumps. They convert mechanical energy into hydraulic energy of mud through the reciprocating motion of the piston in the cylinder liner, thereby providing high-pressure and stable mud flow to the drilling circulation system. The structure of the pump mainly consists of two parts: the power end and the hydraulic end.

[0003] The power end, as the driving core, typically includes a prime mover, a reduction mechanism, and a crank-connecting rod system. The prime mover can be an electric motor or a diesel engine. The reduction mechanism achieves speed reduction and torque increase through gear or belt transmission. The crank-connecting rod system converts rotary motion into linear reciprocating motion of the piston; its structural rigidity and motion accuracy directly affect the pump's reliability and lifespan. The hydraulic end, as the medium conveying part, mainly includes the pump body, piston and cylinder liner assembly, valve system assembly, and pressure buffer device. The pump body is usually made of high-strength alloy casting and has internal hydraulic cylinder channels. The piston and cylinder liner slide seal and directly propel the mud. Key components; the valve assembly consists of an intake valve and a discharge valve, employing a one-way valve structure to ensure directional flow of the medium; to improve output stability, modern mud pumps generally adopt a three-cylinder or five-cylinder design, achieving flow superposition through the phase difference of each cylinder, significantly reducing output pulsation; during operation, when the piston moves towards the power end, the volume of the liquid cylinder increases, creating negative pressure, and the intake valve opens under the pressure difference, allowing mud to enter the liquid cylinder; when the piston moves towards the hydraulic end, it compresses the medium, increasing the pressure and opening the discharge valve, allowing mud to enter the discharge pipeline; the alternating operation of multiple cylinders ensures that the total output flow of the pump remains relatively continuous.

[0004] However, in actual drilling operations, solid particles such as rock cuttings and clay contained in the mud medium are prone to adhere and deposit on the valve core sealing surface, resulting in the valve not closing tightly and causing internal leakage. This problem will make it difficult to build up pump cylinder pressure, reduce volumetric efficiency, and at the same time aggravate the erosion and wear of the valve seat, seriously affecting the working efficiency and service life of the mud pump. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is: how to effectively prevent solid particles in the mud from depositing on the valve core sealing surface, thereby ensuring the sealing performance of the valve and maintaining the volumetric efficiency and working stability of the mud pump.

[0006] This invention provides the following technical solution: a piston-type continuous-running mud pump, comprising two main parts: a power end and a hydraulic end. The power end includes a pump casing and a transmission mechanism assembled therein. The hydraulic end includes a cylinder installed at the end of the pump casing and a valve group located inside the cylinder, which can adaptively open and close according to changes in cylinder pressure. The transmission mechanism includes a crankshaft mechanism and at least one set of connecting rods connected to the crankshaft mechanism. The crankshaft mechanism can convert rotational motion into push-pull rotary oscillation of the connecting rods. The pump casing includes a bearing and a guide sleeve respectively adapted to the action of the crankshaft mechanism and the connecting rods, while the connecting rods include a slider slidably disposed within the guide sleeve. When the linkage assembly performs a push-pull rotary swing, the slider inside can move linearly along the guide sleeve. Multiple vertical flow channels are opened vertically inside the cylinder, their number corresponding to the linkage assembly. Both ends of the vertical flow channels are connected to valve chambers, which house the valve assembly and its surrounding cleaning mechanism. The cleaning mechanism includes a cleaning drum that can rotate around the valve assembly. A linkage mechanism is connected to the sides of the two cleaning drums on the same side, and the side of the linkage mechanism closest to the power end is connected to the slider. The linearly moving slider can transmit power through the linkage mechanism, driving the corresponding upper and lower cleaning drums to rotate, thus providing continuous cleaning during the opening and closing of the valve assembly.

[0007] Furthermore, the pump housing is also provided with a cylinder liner that can be detachably assembled at the end of the guide sleeve, and a valve port communicating with the vertical flow channel and the valve chamber is provided; the valve group consists of a valve cover, a first elastic element and a valve core connected from top to bottom, wherein the valve cover is fixed in the valve chamber, and the pressure change causes the first elastic element to elastically deform, thereby driving the valve core to move vertically to control the opening and sealing of the valve port.

[0008] Furthermore, the valve chamber is structurally divided into upper and lower sections: the upper section is the upper valve chamber for fixing the valve cover, and the lower section is the lower valve chamber for accommodating the cleaning drum. The inner diameter of the lower valve chamber is set to be larger than that of the upper valve chamber, so as to ensure that the rotation of the cleaning drum and the vertical movement of the valve core do not interfere with each other, thus forming a spatial coordination between axial movement and circumferential cleaning.

[0009] Furthermore, the cleaning drum includes a drum body rotatably disposed within the lower valve chamber. The bottom of the outer side wall of the drum body is provided with a toothed ring, which is adapted to the guide groove opened on the side wall of the lower valve chamber. The inner side wall of the drum body is densely covered with bristles, the length of which is configured to contact the side wall during the vertical movement of the valve core.

[0010] Furthermore, the linkage mechanism includes a bidirectional rocker arm mounted on the side wall of the hydraulic cylinder, which is connected to two cleaning drums on the same side; a push-pull arm is movably connected above the bidirectional rocker arm, one end of which extends toward the bidirectional rocker arm and is rotatably connected thereto, and the other end extends horizontally toward the power end and is bent downward at the slider and fixed to its surface.

[0011] Furthermore, the bidirectional rocker arm includes a swing arm with a rocker arm shaft fixed to the side wall of the hydraulic cylinder in a horizontal direction at its center. The end shaft of the rocker arm shaft is rotatably connected to the center of the swing arm. Two parallel toothed rods are hinged to the top and bottom of the swing arm, respectively. The toothed rods move through the side wall of the hydraulic cylinder and can mesh with toothed rings in the corresponding guide grooves. At the same time, the end of the push-pull arm near the bidirectional rocker arm forms a hook structure and is hinged to the side wall of the swing arm that is offset from the end shaft of the rocker arm shaft.

[0012] Furthermore, the rocker arm is configured as a telescopic structure, which includes an inner sleeve rotatably mounted on the end shaft of the rocker arm shaft and telescopic rods slidably inserted into both ends of the inner sleeve. The ends of the two telescopic rods away from the inner sleeve are respectively hinged to the gear rod.

[0013] Furthermore, a number of protrusions are fixed equidistantly on the outer wall of the rotating cylinder, and the protrusions are connected to the internal cavity of the rotating cylinder; an annular groove adapted to the circumferential movement of the protrusions is opened on the inner side of the lower valve cavity, and a sealing ring that wraps the protrusions is installed in the annular groove, and the inner edge of the sealing ring is in contact with the side wall of the rotating cylinder; a liquid injection mechanism is also installed on the side wall of the sealing ring, and the liquid injection mechanism is connected to the delivery end of the cleaning reagent.

[0014] Furthermore, the protrusion is approximately trapezoidal, with its two side walls being inclined sides and its outer edge being an arc surface. A lateral opening is provided on the inclined side near the direction of rotation. Liquid flows in through the lateral opening of the rotating protrusion and is introduced into the clamping cavity of the rotating cylinder. A discharge pipe communicating with the clamping cavity is fixed at the bottom of the inner wall of the rotating cylinder.

[0015] Furthermore, the liquid injection mechanism includes a liquid storage tank fixed inside the liquid cylinder, a jet pipe extending from the liquid storage tank and movably inserted into the sealing ring, the other end of the jet pipe movably penetrating through the side wall of the liquid storage tank and sliding into its interior, and is connected to a second elastic element; the liquid storage tank and the jet pipe are respectively provided with check valves for unidirectional liquid entry and exit.

[0016] The technical effects and advantages of this invention are as follows:

[0017] The linear movement of the slider is driven by the oscillating motion of the linkage assembly, and through the coordinated transmission of a series of linkages such as the push-pull arm and the bidirectional rocker arm, the corresponding upper and lower cleaning drums are ultimately rotated. At the same time, the variable liquid chamber pressure change causes the first elastic element to deform elastically, thereby driving the valve core to move vertically to seal or open the valve port. During this process, the rotating cleaning drum continuously cleans the surface of the vertically moving valve core with the bristles on its inner wall. This structure forms a spatial linkage between axial movement and circumferential cleaning, which has a high efficiency of self-cleaning capability. It can effectively prevent solid particles in the mud from depositing on the valve core sealing surface, significantly improve the sealing performance and operational reliability of the valve, thereby ensuring the long-term stability of the volumetric efficiency of the mud pump, extending the service life of key components, and enhancing the operational stability of the whole machine under harsh working conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall structure and a partial cross-section of the present invention.

[0020] Figure 3 This is a schematic diagram of the transmission mechanism and cylinder liner structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the crankshaft mechanism and connecting rod assembly of the present invention.

[0022] Figure 5 This is a schematic diagram of the cylinder liner, hydraulic cylinder, valve group, cleaning mechanism, and connecting rod mechanism of the present invention.

[0023] Figure 6 This is a schematic diagram of the cylinder liner, hydraulic cylinder, and valve assembly structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the cylinder liner, hydraulic cylinder, valve group, cleaning mechanism, and connecting rod mechanism of the present invention.

[0025] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point A in the middle.

[0026] Figure 9 For the present invention Figure 7 Schematic diagram of the local structure of the liquid cylinder, valve group, and cleaning mechanism.

[0027] Figure 10 For the present invention Figure 9 Schematic diagram of the structure at point B.

[0028] Figure 11 This is a schematic diagram of the cleaning drum and protrusion structure of the present invention.

[0029] Figure 12 This is a schematic diagram of the bidirectional rocker arm structure of the present invention.

[0030] The attached figures are labeled as follows: 1. Pump casing; 11. Shaft seat; 12. Guide sleeve; 13. Cylinder liner; 2. Transmission mechanism; 21. Crankshaft mechanism; 211. Crank disc; 212. Main shaft; 213. Crank pin; 22. Connecting rod assembly; 221. Roller sleeve; 222. Connecting rod body; 223. Slider; 23. Piston assembly; 231. Plug rod; 232. Plug handle; 3. Hydraulic cylinder; 31. Vertical flow channel; 32. Valve chamber; 321. Upper valve chamber; 322. Lower valve chamber; 323. Guide groove; 324. Annular groove; 33. Valve port; 4. Valve assembly; 41. Valve cover. ; 42. First elastic element; 43. Valve core; 5. Cleaning mechanism; 51. Cleaning drum; 511. Drum body; 512. Gear ring; 513. Bristles; 514. Discharge pipe; 515. Connecting joint; 52. Protrusion; 53. Sealing ring; 54. Liquid injection mechanism; 541. Liquid storage tank; 542. Jet top pipe; 543. Second elastic element; 544. Roller; 6. Linkage mechanism; 61. Bidirectional rocker arm; 611. Swing arm; 6111. Inner sleeve; 6112. Telescopic rod; 612. Rocker arm shaft; 613. Gear; 62. Push-pull arm. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The piston-type continuous operation mud pump involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, refer to Figures 1 to 8 as well as Figure 12 As shown, the present invention provides a piston-type continuous operation mud pump, which mainly consists of two parts: a power end and a hydraulic end. The power end includes a pump housing 1 and a transmission mechanism 2 assembled therein. The hydraulic end includes a hydraulic cylinder 3 installed at the end of the pump housing 1 and a valve group 4 disposed therein that can adaptively open and close according to changes in the cylinder pressure. The transmission mechanism 2 includes a crankshaft mechanism 21 and at least one set of connecting rods 22 connected to the crankshaft mechanism 21. The crankshaft mechanism 21 can convert rotational motion into push-pull rotary oscillation of the connecting rods 22. The pump housing 1 includes a bearing seat 11 and a guide sleeve 12 that are adapted to the action of the crankshaft mechanism 21 and the connecting rods 22, respectively. The connecting rods 22 include a slider 223 that is slidably disposed in the guide sleeve 12. When the connecting rods 22 performs push-pull rotary oscillation, the slider 223 inside it can move linearly along the guide sleeve 12.

[0033] Multiple vertical flow channels 31 are opened vertically inside the cylinder 3, the number of which corresponds to the connecting rod assembly 22. Both the upper and lower ends of the vertical flow channels 31 are connected to valve chambers 32. Valve assembly 4 and its surrounding cleaning mechanism 5 are installed inside the valve chamber 32. The cleaning mechanism 5 includes a cleaning drum 51 that can rotate around the valve assembly 4. The upper and lower cleaning drums 51 on the same side are connected to a connecting rod mechanism 6, and the side of the connecting rod mechanism 6 near the power end is connected to the slider 223. The linearly moving slider 223 can transmit power through the connecting rod mechanism 6 to drive the upper and lower corresponding cleaning drums 51 to rotate, thereby forming a continuous cleaning effect on the valve assembly 4 during the opening and closing process.

[0034] In this embodiment, it should be noted that the pump housing 1 is also provided with a cylinder sleeve 13 that can be detachably assembled to the end of the guide sleeve 12. The other end of the cylinder sleeve 13 is detachably installed on the side wall of the liquid cylinder 3. In the axial direction, the guide sleeve 12, the cylinder sleeve 13 and the vertical flow channel 31 are in a one-to-one alignment relationship.

[0035] The transmission mechanism 2 also includes a piston assembly 23 mounted on the end of the slider 223 and pointing towards the hydraulic end. The piston assembly 23 forms a sliding seal with the plug cavity of the cylinder liner 13. Its structure is integrally formed by a plug rod 231 that moves through the side wall of the cylinder liner 13 and a plug handle 232 that slides and seals in the plug cavity. The plug handle 232 divides the plug cavity of the cylinder liner 13 into two parts, of which the area connected to the vertical flow channel 31 forms a variable liquid cavity. The volume of the variable liquid cavity is changed by the linear reciprocating motion of the piston assembly 23 in the cylinder liner 13, thereby realizing the regulation of pressure.

[0036] The crankshaft mechanism 21 includes a main shaft 212 rotatably mounted on both ends of the bearing seat 11. Multiple crank discs 211 are arranged in an array between the main shafts 212. Adjacent crank discs 211 are fixed together by eccentrically arranged crank pins 213. The crank pins 213 are equidistantly staggered in the circumferential direction among the multiple crank discs 211. The outermost crank disc 211 is coaxially fixed with the main shaft 212. When an external power device drives the main shaft 212, the main shaft 212 drives the multiple crank discs 211 to rotate coaxially. These staggered crank pins 213 generate a regular circular trajectory around the center of the main shaft 212. (Note: The external power device is a combination of a prime mover and a reducer.)

[0037] The connecting rod assembly 22 includes a roller sleeve 221 rotatably sleeved on the surface of the crank pin 213. The roller sleeve 221 extends a connecting rod body 222 towards the slider 223, and the connecting rod body 222 and the slider 223 are hinged. When the crankshaft mechanism 21 rotates, the roller sleeve 221 moves in a circular motion with the crank pin 213, thereby alternately pulling back or pushing the connecting rod body 222 outward, driving the slider 223 to reciprocate linearly along the guide sleeve 12.

[0038] A valve port 33 is provided between the vertical flow channel 31 and the valve chamber 32 and communicates with it; the valve group 4 is composed of a valve cover 41, a first elastic element 42 and a valve core 43 connected from top to bottom. The valve cover 41 is fixed in the valve chamber 32. The first elastic element 42 is elastically deformed by the pressure change of the variable liquid chamber, thereby driving the valve core 43 to move vertically to control the opening and sealing of the valve port 33.

[0039] The valve chamber 32 is structurally divided into upper and lower sections: the upper section is the upper valve chamber 321 used to fix the valve cover 41, and the lower section is the lower valve chamber 322 used to accommodate the cleaning drum 51. The inner diameter of the lower valve chamber 322 is set to be larger than that of the upper valve chamber 321, so as to ensure that the rotation of the cleaning drum 51 and the vertical movement of the valve core 43 do not interfere with each other, thus forming a spatial coordination between axial movement and circumferential cleaning.

[0040] The cleaning drum 51 includes a drum body 511 rotatably disposed in the lower valve chamber 322. The bottom of the outer side wall of the drum body 511 is provided with a toothed ring 512, which is adapted to the guide groove 323 opened on the side wall of the lower valve chamber 322 to meet its rotation requirements. The inner side wall of the drum body 511 is densely covered with bristles 513, the length of which is configured to be sufficient to contact its side wall during the vertical movement of the valve core 43.

[0041] The linkage mechanism 6 includes a bidirectional rocker arm 61 mounted on the side wall of the hydraulic cylinder 3 away from the cylinder liner 13. The bidirectional rocker arm 61 is connected to two cleaning drums 51 on the same side. A push-pull arm 62 is movably connected above the bidirectional rocker arm 61. One end of the push-pull arm 62 extends toward the bidirectional rocker arm 61 and is rotatably connected to it. The other end extends horizontally toward the power end and is bent downward at the slider 223 and fixed to its surface. A channel for the push-pull arm 62 to move is opened on the surface of the guide sleeve 12. The slider 223 is driven to move linearly by the rotational swing of the linkage group 22. Then, through the coordinated transmission of the push-pull arm 62 and the bidirectional rocker arm 61 and other linkages, the corresponding upper and lower cleaning drums 51 are finally driven to rotate.

[0042] The bidirectional rocker arm 61 includes a swing arm 611, with a rocker arm shaft 612 fixed to the side wall of the liquid cylinder 3 in a horizontal direction at its center. The end shaft of the rocker arm shaft 612 is rotatably connected to the center of the swing arm 611. Two parallel toothed rods 613 are hinged to the top and bottom of the swing arm 611, respectively. The toothed rods 613 move through the side wall of the liquid cylinder 3 and can mesh with the toothed rings 512 in the corresponding guide grooves 323. At the same time, the push-pull arm 62 forms a hook structure at one end near the bidirectional rocker arm 61 and is hinged to the side wall of the swing arm 611 that is offset from the end shaft of the rocker arm shaft 612. When the push-pull arm 62 performs axial reciprocating motion, the hook structure at its bottom end pulls the swing arm 611 that is hinged to it, causing the swing arm 611 to rotate around the end shaft of the rocker arm shaft 612, thereby pulling the toothed rods 613 hinged at its upper and lower ends to move horizontally in opposite directions, and finally driving the upper and lower corresponding cleaning drums 51 to rotate synchronously.

[0043] The swing arm 611 is configured as a telescopic structure, which includes an inner sleeve 6111 rotatably mounted on the end shaft of the rocker arm shaft 612 and telescopic rods 6112 slidably inserted into both ends of the inner sleeve 6111. The ends of the two telescopic rods 6112 away from the inner sleeve 6111 are respectively hinged to the rack 613. When the upper and lower racks 613 move horizontally towards each other, the rotating swing arm 611 dynamically compensates through the adaptive extension and contraction of its total length, thereby ensuring the stability of the entire transmission structure.

[0044] Example 2, refer to Figures 9 to 10 As shown, in order to continuously improve the cleaning effect of the cleaning drum 51 on the valve core 43, the structure of the cleaning drum 51 is optimized as follows: a number of protrusions 52 are fixed equidistantly on the outer wall of the drum body 511, and the protrusions 52 are connected to the internal cavity of the drum body 511; an annular groove 324 adapted to the circumferential movement of the protrusions 52 is opened on the inner side of the lower valve cavity 322, and a sealing ring 53 that wraps the protrusions 52 is installed in the annular groove 324, and the inner edge of the sealing ring 53 is in contact with the side wall of the drum body 511; a liquid injection mechanism 54 is also installed on the side wall of the sealing ring 53, and the liquid injection mechanism 54 is connected to the delivery end of the cleaning reagent.

[0045] The protrusion 52 is approximately trapezoidal, with inclined sides on both sides and an arc surface on the outer edge. A lateral opening is provided on the inclined side near the direction of rotation. Liquid flows in through the lateral opening of the rotating protrusion 52 and is introduced into the clamping cavity of the rotating cylinder 511.

[0046] The liquid injection mechanism 54 includes a liquid storage tank 541 fixed inside the liquid cylinder 3, and a jet nozzle 542 extending from the liquid storage tank 541 and movably inserted into the sealing ring 53. The other end of the jet nozzle 542 movably penetrates the side wall of the liquid storage tank 541 and slides into its interior, while being connected to a second elastic element 543. Check valves for one-way liquid entry and exit are respectively provided inside the liquid storage tank 541 and the jet nozzle 542. As multiple protrusions 52 are alternately engaged, the jet nozzle 542 is intermittently compressed or extended with the cooperation of the second elastic element 543, thereby completing the discharge or replenishment of cleaning reagent in the liquid storage tank 541 and realizing continuous liquid delivery to the sealing ring 53. The liquid chamber of the liquid storage tank 541 is connected to the delivery end of the cleaning reagent.

[0047] The bottom of the inner wall of the rotating drum 511 is fixed with a discharge pipe 514 that communicates with its clamping cavity. The cleaning reagent is discharged into the valve chamber 32 through the discharge pipe 514 under the action of centrifugal force generated by the rotation of the cleaning drum 51, and mixes with the mud-water mixture therein, thereby effectively reducing the adhesion of viscous impurities in the mud.

[0048] Example 3, refer to Figure 11As shown, in order to facilitate the inspection and maintenance of the cleaning drum 51 or valve group 4, the structure of the liquid cylinder 3 and the cleaning mechanism 5 is optimized and improved as follows: the liquid cylinder 3, the cleaning drum 51 and the sealing ring 53 are symmetrically divided into two parts along the direction perpendicular to the vertical flow channel 31, and a sealing gasket is set at the splice to ensure that the overall sealing performance is not affected while ensuring disassembly.

[0049] On the mating surfaces of the two halves of the rotating cylinder 511 after the split, there are centrally symmetrically arranged connectors 515 and their matching sockets, so that the two can be precisely spliced ​​into a complete circle and maintain internal communication.

[0050] The end of the jet jack 542 may also be fitted with a roller 544, the width of which is at least greater than the lateral opening.

[0051] Working principle of this invention:

[0052] The power output from the prime mover is reduced in speed and increased in torque by the reducer, which then drives the crankshaft mechanism 21 to rotate. The crankshaft mechanism 21 converts the rotational motion into a push-pull rotary oscillation of the connecting rod assembly 22, which in turn drives the piston assembly 23 to make linear reciprocating motion within the cylinder liner 13. The piston handle 232 in the piston assembly 23 divides the cylinder liner 13 into two parts, and the area connected to the vertical flow channel 31 forms a variable liquid chamber. When the piston assembly 23 moves towards the power end, the volume of the variable liquid chamber increases, creating a negative pressure. The valve assembly 4 on the suction side opens under the action of the pressure difference, and the slurry enters the variable liquid chamber. When the piston assembly 23 moves towards the hydraulic end, it compresses the medium, and the increased pressure causes the valve assembly 4 on the discharge side to open, and the slurry enters the discharge pipeline from the variable liquid chamber. Through the alternating operation of multiple cylinders, the total output flow of the pump is kept relatively continuous. (Note: The two valve assemblies 4 in the same cylinder, namely the valve assembly 4 on the suction side and the valve assembly 4 on the discharge side, always have opposite opening and closing states: when one is open, the other is closed.)

[0053] When the linkage 22 performs a push-pull rotary swing, its internal slider 223 moves linearly along the guide sleeve 12, thereby driving the push-pull arm 62 to perform axial reciprocating motion. This allows the hook structure at the bottom of the push-pull arm 62 to pull the swing arm 611 hinged to it, causing it to rotate around the end shaft of the rocker arm shaft 612, which in turn pulls the toothed rods 613 hinged at its upper and lower ends to move horizontally towards each other, ultimately driving the corresponding upper and lower cleaning drums 51 to rotate. Since the opening and closing of the valve group 4 is caused by the change in the pressure of the variable liquid chamber, the first elastic element 4... 2. This is achieved through elastic expansion and contraction—the deformed first elastic element 42 drives the valve core 43 to move vertically, causing it to either seal the valve port 33 downwards or be pulled away from the valve port 33 upwards. At this time, the rotating cleaning drum 51 can clean the surface of the vertically moving valve core 43 with the brush bristles 513 on its inner wall. This forms a spatial coordination between axial movement and circumferential cleaning, achieving efficient cleaning and effectively preventing solid particles in the mud from depositing on the sealing surface of the valve core 43, thereby ensuring the sealing performance of the valve and maintaining the volumetric efficiency and working stability of the mud pump.

[0054] When the rotating cleaning drum 51 cleans the vertically moving valve core 43, the protrusions 52, circumferentially spaced on the side wall of the drum body 511, rotate together and slide along the inner circumference of the sealed ring 53. Because the end of the jet nozzle 542 extends deep into the sealing ring 53 under the elastic force of the second elastic element 543, when the protrusions 52 sliding along the inner circumference of the sealing ring 53 contact the end of the jet nozzle 542, the inclined side of the protrusion 52 will gradually push the jet nozzle 542 outward to compress the second elastic element 543. The pressure reaches its peak when it slides to the arc surface of the outer edge of the protrusion 52, and then gradually recovers through its other inclined side. (Note: The liquid storage tank 541 and the jet nozzle 542 are respectively equipped with a one-way liquid inlet and outlet...) When the hydraulic pressure inside the storage tank 541 rises, the cleaning agent inside is discharged into the sealing ring 53 via the jet top pipe 542. As multiple protrusions 52 are intermittently engaged, the jet top pipe 542 is intermittently compressed or extended with the cooperation of the second elastic element 543, thereby completing the discharge or replenishment of the cleaning agent in the storage tank 541 and realizing continuous liquid delivery to the sealing ring 53. The liquid flow is injected through the lateral opening of the rotating protrusion 52 and introduced into the clamping cavity of the rotating cylinder 511. Under the action of centrifugal force generated by the rotation of the cleaning rotating cylinder 51, it is discharged through the discharge pipe 514 and enters the valve chamber 32, mixing into the mud-water mixture, effectively reducing the adhesion of viscous impurities in the mud, and further improving the cleaning effect of the brush bristles 513 on the valve core 43.

[0055] The above is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, in accordance with the technical plan and its improved concept, should be included under the protection of the present invention.

Claims

1. A piston-type continuous-running mud pump, comprising two main parts: a power end and a hydraulic end: The power end includes a pump housing (1) and a transmission mechanism (2) assembled therein. The hydraulic end includes a hydraulic cylinder (3) installed at the end of the pump housing (1) and a valve group (4) located inside the cylinder that can adaptively open and close according to changes in cylinder pressure. The transmission mechanism (2) includes a crankshaft mechanism (21) and at least one set of connecting rods (22) connected to the crankshaft mechanism (21). The crankshaft mechanism (21) can convert rotational motion into push-pull rotary oscillation of the connecting rod group (22). The pump housing (1) includes a bearing seat (11) and a guide sleeve (12) adapted to the movement of the crankshaft mechanism (21) and the connecting rod group (22), respectively. The connecting rod group (22) includes a slider (223) slidably disposed in the guide sleeve (12). When the connecting rod group (22) performs push-pull rotary oscillation, the slider (223) inside it... It can move linearly along the guide sleeve (12); characterized in that: multiple vertical flow channels (31) are opened vertically inside the liquid cylinder (3), the number of which corresponds to the connecting rod group (22), and the upper and lower ends of the vertical flow channels (31) are connected to valve chambers (32), and valve groups (4) and their surrounding cleaning mechanisms (5) are installed in the valve chambers (32); the cleaning mechanism (5) includes a cleaning drum (51) that can rotate around the valve group (4), and the two cleaning drums (51) on the same side are connected to a connecting rod mechanism (6) on the side, and the side of the connecting rod mechanism (6) near the power end is connected to the slider (223); the linearly moving slider (223) can transmit power through the connecting rod mechanism (6) to drive the corresponding upper and lower cleaning drums (51) to rotate, thereby forming a continuous cleaning effect on the valve group (4) during the opening and closing process.

2. The piston-type continuous-running mud pump according to claim 1, characterized in that: The pump housing (1) is also provided with a cylinder liner (13) that can be detachably assembled at the end of the guide sleeve (12). A valve port (33) communicating with the vertical flow channel (31) and the valve chamber (32) is provided. The valve group (4) is composed of a valve cover (41), a first elastic element (42) and a valve core (43) connected from top to bottom. The valve cover (41) is fixed in the valve chamber (32). Pressure changes cause the first elastic element (42) to deform elastically, thereby driving the valve core (43) to move vertically to control the opening and sealing of the valve port (33).

3. The piston-type continuous-running mud pump according to claim 2, characterized in that: The valve chamber (32) is structurally divided into upper and lower sections: the upper section is the upper valve chamber (321) for fixing the valve cover (41), and the lower section is the lower valve chamber (322) for accommodating the cleaning drum (51). The inner diameter of the lower valve chamber (322) is set to be larger than that of the upper valve chamber (321) to ensure that the rotation of the cleaning drum (51) and the vertical movement of the valve core (43) do not interfere with each other, thus forming a spatial coordination between axial movement and circumferential cleaning.

4. The piston-type continuous-running mud pump according to claim 3, characterized in that: The cleaning drum (51) includes a drum body (511) rotatably disposed in the lower valve chamber (322). The bottom of the outer side wall of the drum body (511) is provided with a toothed ring (512) which is adapted to the guide groove (323) opened on the side wall of the lower valve chamber (322). The inner side wall of the drum body (511) is densely covered with bristles (513), the length of which is configured to contact the side wall during the vertical movement of the valve core (43).

5. The piston-type continuous-running mud pump according to claim 1 or 4, characterized in that: The linkage mechanism (6) includes a bidirectional rocker arm (61) mounted on the side wall of the hydraulic cylinder (3). The bidirectional rocker arm (61) is connected to two cleaning drums (51) on the same side. A push-pull arm (62) is movably connected above the bidirectional rocker arm (61). One end of the push-pull arm (62) extends toward the bidirectional rocker arm (61) and is rotatably connected thereto. The other end extends horizontally toward the power end and is bent downward at the slider (223) and fixed to its surface.

6. The piston-type continuous-running mud pump according to claim 5, characterized in that: The bidirectional rocker arm (61) includes a swing arm (611), with a rocker arm shaft (612) fixed to the side wall of the liquid cylinder (3) in the horizontal direction at its center. The end shaft of the rocker arm shaft (612) is rotatably connected to the center of the swing arm (611). The top and bottom of the swing arm (611) are respectively hinged with two parallel toothed rods (613). The toothed rods (613) move through the side wall of the liquid cylinder (3) and can mesh with the toothed rings (512) in the corresponding guide grooves (323). At the same time, the push-pull arm (62) forms a hook structure at one end near the bidirectional rocker arm (61) and is hinged to the side wall of the swing arm (611) that is offset from the end shaft of the rocker arm shaft (612).

7. The piston-type continuous-running mud pump according to claim 6, characterized in that: The swing arm (611) is configured as a telescopic structure, which includes an inner sleeve (6111) rotatably mounted on the end shaft of the rocker arm shaft (612) and telescopic rods (6112) slidably inserted into both ends of the inner sleeve (6111). The ends of the two telescopic rods (6112) away from the inner sleeve (6111) are respectively hinged to the rack (613).

8. The piston-type continuous-running mud pump according to claim 4, characterized in that: The outer wall of the rotating cylinder (511) is fixed with several protrusions (52) at equal intervals around the circumference. The protrusions (52) are connected to the internal cavity of the rotating cylinder (511). The inner side of the lower valve cavity (322) is provided with an annular groove (324) adapted to the circumferential movement of the protrusions (52). A sealing ring (53) is installed in the annular groove (324) to wrap the protrusions (52), and the inner edge of the sealing ring (53) is in contact with the side wall of the rotating cylinder (511). The side wall of the sealing ring (53) is also equipped with a liquid injection mechanism (54), which is connected to the delivery end of the cleaning reagent.

9. The piston-type continuous-running mud pump according to claim 8, characterized in that: The protrusion (52) is approximately trapezoidal, with its two side walls being inclined sides and its outer edge being an arc surface. A lateral opening is provided on the inclined side near the direction of rotation. Liquid flows in through the lateral opening of the rotating protrusion (52) and is introduced into the clamping cavity of the rotating cylinder (511). The bottom of the inner wall of the rotating cylinder (511) is fixed with a discharge pipe (514) communicating with its clamping cavity.

10. The piston-type continuous-running mud pump according to claim 9, characterized in that: The liquid injection mechanism (54) includes a liquid storage tank (541) fixed inside the liquid cylinder (3), a jet pipe (542) extending from the liquid storage tank (541) and movably inserting into the sealing ring (53), the other end of the jet pipe (542) movably penetrating through the side wall of the liquid storage tank (541) and sliding into its interior, and is connected to a second elastic element (543); the liquid storage tank (541) and the jet pipe (542) are respectively provided with check valves for one-way liquid entry and exit.

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