A horizontal ultra-high pressure pump without uneven wear

Abstract

The present application discloses a non-biased wear horizontal ultra-high pressure pump, comprising: a cylinder sleeve, a plunger assembly, a motor assembly and a crankshaft assembly; the plunger assembly comprises a plunger and a plunger joint, the plunger is connected to one end of the plunger joint and is slidably sleeved in the cylinder sleeve, the other end of the plunger joint is provided with an opening, the opening is sleeved with a connecting rod, and the connecting rod is connected to the crankshaft assembly through a universal coupling; the motor assembly comprises a transmission gear, and a tooth profile is provided on the outer side of the end of the plunger joint close to the plunger, and the transmission gear is meshed with the tooth profile; wherein, when the crankshaft assembly pulls the plunger back, the transmission gear drives the plunger joint to rotate. The present application detects the movement of the plunger through a sensor and transmits it to the controller, thereby controlling the operation of the servo motor, and then controlling the plunger joint to drive the plunger to rotate, so that the plunger surface is evenly worn, thereby increasing the service life of the vulnerable part plunger, reducing the replacement cycle, and achieving better economic benefits.

Description

Technical Field

[0001] The present application belongs to the field of ship and offshore engineering technology, and specifically relates to a non-uniformly worn horizontal ultra-high pressure pump. Background Art

[0002] Ultra-high pressure pumps are prone to various faults and problems during the use of green shipbuilding and offshore engineering, which affect their service life and bring safety risks. In this regard, the common faults and causes of ultra-high pressure pumps are analyzed, and it is found that the main part that affects its service life is the plunger. It is necessary to optimize and improve the plunger design to increase the service life of the ultra-high pressure pump.

[0003] Generally, the seal of an ultra-high pressure pump adopts a combination of packing seal and gap seal. When the plunger moves during the push stroke, a high-pressure vacuum space is formed, the gap shrinks, and the plunger is eccentric to the ground end due to gravity, and the cylindrical surface is worn, which makes it difficult for the ultra-high pressure pump to gradually reach the required flow requirements during use, and even causes damage and failure of other components. Therefore, the plunger, as a wearable part, needs to be replaced frequently, but the cost of frequent replacement is quite high, which affects work efficiency. In addition, when the plunger moves during the return stroke, there is a gap between the plunger and the packing, which makes it possible for the plunger to rotate. Therefore, the applicant proposes a rotatable plunger structure to ensure uniform wear of the plunger during the operation of the ultra-high pressure pump and greatly improve the service life of the plunger.

[0004] The plunger is the main vulnerable part in the ultra-high pressure pump, which directly affects the flow rate, pressure and other performances of the pump. The main failure forms of the plunger are wear and pitting on the side of the plunger near the ground. In order to extend the service life of the plunger and reduce the maintenance cost of the plunger, the existing technologies include patent CN113604802A, which first makes the rod core from stainless steel material, forms a deeper alloy transition layer on the surface by micro-texturing and laser alloying, transforms the surface of the rod core into cemented carbide by surface laser alloying, and finally forms a cladding layer by laser cladding cemented carbide powder, and then uses laser shock strengthening to eliminate the interface between the transition layer and the cladding layer, thereby extending the life of the plunger by improving the toughness and hardness of the plunger; Patent CN215 566550U discloses installing a drive module at the plunger connection, which is connected to the socket by an insert rod, thereby enhancing the stability of the plunger and preventing displacement. A protective ring is installed at the end of the plunger to prevent the end of the plunger from directly contacting the inner wall of the cylinder, thereby reducing the wear on the end of the plunger. The technology disclosed in CN113604802A only slightly improves the life of the plunger. In actual applications, the plunger designed with cemented carbide material has too high a density and is aggravated by the influence of gravity. The improved wear resistance is difficult to make up for the defects caused by its own weight. At the same time, the plunger serves in a high-pressure environment for a long time, which will seriously affect the performance such as flow pulsation, cause damage to other components at the connection, and greatly increase the maintenance cost. Summary of the invention

[0005] The present application provides a horizontal ultra-high pressure pump without uneven wear, so as to solve the technical problem that the traditional plunger will deviate after being used for too long.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: a non-biased wear horizontal ultra-high pressure pump, comprising: a cylinder liner, a plunger assembly, a motor assembly and a crankshaft assembly; the plunger assembly comprises a plunger and a plunger joint, the plunger is connected to one end of the plunger joint and is slidably sleeved in the cylinder liner, the other end of the plunger joint is provided with an opening, the opening is sleeved with a connecting rod, and the connecting rod is connected to the crankshaft assembly through a universal coupling; the motor assembly comprises a transmission gear, and a tooth profile is provided on the outer side of the end of the plunger joint close to the plunger, and the transmission gear is meshed with the tooth profile; wherein, when the crankshaft assembly pulls the plunger back, the transmission gear drives the plunger joint to rotate.

[0007] Further, in the extension direction of the plunger, the length of the transmission gear is smaller than the length of the tooth profile, wherein the gear teeth of the transmission gear are slidingly arranged along the tooth profile.

[0008] Furthermore, a pressure cover is provided on the outer side of the opening, and the connecting rod is located in the opening and connected to the opening through a thrust bearing, wherein the inner diameter of the pressure cover is smaller than the outer diameter of the thrust bearing.

[0009] Furthermore, the universal coupling includes an arc plate, a sliding rod and a sliding sleeve. The sliding rod is fixed to both sides of the concave portion of the arc plate, the sliding sleeve is arranged on the sliding rod, and the middle end of the convex portion of the arc plate is connected to the connecting rod.

[0010] Furthermore, the crankshaft assembly includes a turntable, a crankshaft disc and an intermediate rod. The crankshaft disc is movably connected to the turntable through a movable shaft. The convex end of the crankshaft disc is connected to one side of the intermediate rod, and the other side of the intermediate rod is movably connected to the sliding sleeve.

[0011] Furthermore, the movable axis is located between the center and the edge of the circle in the turntable.

[0012] Furthermore, a through slot is provided at one end of the intermediate rod connected to the sliding sleeve, and the sliding sleeve is located in the through slot and is pivotally connected to the through slot via a second rotating shaft.

[0013] Furthermore, the motor assembly also includes a sensor, a controller and a servo motor. The controller is connected to the sensor and the servo motor respectively, and the rotating shaft of the servo motor is sleeved with a transmission gear.

[0014] The beneficial effects of the present application are as follows: the present application processes a tooth shape at the plunger joint, and the plunger is connected to the servo motor through gear transmission on the one hand, and the plunger joint is connected to the plunger through a coupling on the other hand. The sensor detects the movement of the plunger and transmits it to the controller, thereby controlling the operation of the servo motor, and then controlling the plunger joint to drive the plunger to rotate, so that the plunger surface is evenly worn, thereby increasing the service life of the wearing part plunger, reducing the replacement cycle, and achieving better economic benefits. In addition, the present application performs tooth profile processing on the plunger joint, which has better rigidity and strength than directly processing the tooth profile on the plunger. The sensor detection device performs closed-loop monitoring of the plunger movement, and has the advantage of high-precision control. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of a horizontal ultra-high pressure pump without uneven wear of the present application;

[0016] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle area A;

[0017] Figure 3 yes Figure 2 A schematic structural diagram of an embodiment of an intermediate rod in FIG.

[0018] Figure 4 It is a signal transmission flow chart of an embodiment of a horizontal ultra-high pressure pump without uneven wear of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0020] like Figure 1 As shown, Figure 1It is a structural schematic diagram of an embodiment of a horizontal ultra-high pressure pump without eccentric wear of the present application. The ultra-high pressure pump comprises: a cylinder sleeve 1, a plunger assembly 2, a motor assembly 3 and a crankshaft assembly 4; the plunger assembly 2 comprises a plunger 21 and a plunger joint 22, the plunger 21 is connected to one end of the plunger joint 22 and is slidably sleeved in the cylinder sleeve 1, the other end of the plunger joint 22 is provided with an opening 23, the opening 23 is sleeved with a connecting rod 5, and the connecting rod 5 is connected to the crankshaft assembly 4 through a universal coupling 6; the motor assembly 3 comprises a transmission gear 31, and a tooth profile 24 is provided on the outer side of the end of the plunger joint 22 close to the plunger 21, and the transmission gear 31 is meshed with the tooth profile 24; wherein, when the crankshaft assembly 4 pulls the plunger 21 to retract, the transmission gear 31 drives the plunger joint 22 to rotate. In the above design, the extension and retraction of the plunger assembly 2 is controlled by the crankshaft assembly 4. When the plunger 21 retracts, the plunger joint 22 is driven to rotate by the motor assembly 3, thereby adjusting the rotation of the plunger 21 so that the plunger 21 can rotate a certain angle each time it works, thereby ensuring uniform wear on the surface of the plunger 21, thereby increasing the service life of the wearing part plunger 21.

[0021] The present application processes the tooth shape at the plunger joint 22. The plunger 21 is driven by the transmission gear 31 on the one hand, and the transmission gear 31 is connected to the motor. On the other hand, the plunger joint 22 is connected to the plunger 21 through a coupling. The sensor 32 detects the movement of the plunger 21 and transmits it to the controller 33, thereby controlling the operation of the servo motor 34, and then controlling the plunger joint 22 to drive the plunger 21 to rotate, so that the surface of the plunger 21 is evenly worn, thereby increasing the service life of the vulnerable part plunger 21, reducing the replacement cycle, and achieving better economic benefits. In addition, the present application processes the tooth profile 24 on the plunger joint 22, which has better rigidity and strength than directly processing the tooth profile 24 on the plunger 21. The sensor 32 detection device performs closed-loop monitoring of the movement of the plunger 21, and has the advantage of high-precision control.

[0022] In the extension direction of the plunger 21, the length of the transmission gear 31 is less than the length of the tooth profile 24, wherein the gear teeth of the transmission gear 31 are arranged to slide along the tooth profile 24. The above design allows the transmission gear 31 to maintain an engagement state with the tooth profile 24 when the plunger 21 retracts, and at the same time, it can slide on the tooth profile 24, so as to ensure that the plunger 21 retracts normally. In this embodiment, the length of the tooth profile 24 is greater than the extension length of the plunger 21. When the plunger 21 is in an extended state, the transmission gear 31 is engaged with the front end of the tooth profile 24. When the plunger 21 is in a retracted state, the transmission gear 31 rotates and slides along the tooth profile 24 to the rear end and engages with it.

[0023] The motor assembly 3 also includes a sensor 32, a controller 33 and a servo motor 34. The controller 33 is connected to the sensor 32 and the servo motor 34 respectively. The rotating shaft of the servo motor 34 is sleeved with a transmission gear 31. The sensor 32 in the above design can detect the position of the plunger 21, so that the controller 33 controls the servo motor 34 to rotate according to the position of the plunger 21, thereby driving the plunger joint 22 and the plunger 21 to rotate.

[0024] A pressure cap 8 is provided on the outside of the opening 23, and the connecting rod 5 is located in the opening 23 and connected to the opening 23 through a thrust bearing 7, wherein the inner diameter of the pressure cap 8 is smaller than the outer diameter of the thrust bearing 7. In this embodiment, the thrust bearing 7 can be a double-row angular contact ball bearing, which can provide a pulling axial force. When the connecting rod 5 is pushed forward, the plunger joint 22 is pressed tight to push the plunger forward. The return stroke of the connecting rod 5 pushes the pressure cap 8 through the double-row angular contact ball bearing to drive the plunger joint 22 to return.

[0025] like Figure 2 As shown, Figure 2 yes Figure 1 Schematic diagram of the structure of the middle area A. The universal coupling 6 includes an arc plate 61, a slide rod 62 and a sleeve 63. The slide rod 62 is fixed to both sides of the concave part of the arc plate 61. The sleeve 63 is slidably sleeved on the slide rod 62. The middle end of the convex part of the arc plate 61 is connected to the connecting rod 5. The sleeve 63 in the above design can slide up and down on the slide rod 62, thereby ensuring that the crankshaft assembly 4 and the sleeve 63 push the universal coupling 6.

[0026] Continue reading Figure 1 The crankshaft assembly 4 includes a turntable 41, a crankshaft disc 42 and an intermediate rod 43. The crankshaft disc 42 is movably connected to the turntable 41 through a movable shaft 44. The convex end of the crankshaft disc 42 is connected to one side of the intermediate rod 43, and the other side of the intermediate rod 43 is movably connected to the sliding sleeve 63. The turntable 41 in the above design rotates, thereby driving the crankshaft disc 42 to move along the turntable 41, thereby controlling the forward and backward movement of the intermediate rod 43 and the upward and downward sliding of the sliding sleeve 63, so as to push and pull the thrust bearing 7 and complete the extension and retraction of the plunger 21. In other embodiments, the crankshaft disc 42 can also be configured as a push-pull rod, one end of which is pivotally connected to the turntable 41 and the other end is connected to the sliding sleeve 63, so that when the turntable 41 rotates, the universal coupling 6 is directly pushed and pulled.

[0027] The movable shaft 44 is located between the center and the edge of the circle in the rotating disk 41. The above design can ensure that the crankshaft disk 42 is driven to rotate when the rotating disk 41 rotates, thereby generating a forward and backward push-pull activity to complete the push-pull of the plunger 21.

[0028] like Figure 3 As shown, Figure 3 yes Figure 2A schematic diagram of the structure of an embodiment of an intermediate rod in the embodiment. A through slot 431 is provided at one end of the intermediate rod 43 connected to the sliding sleeve 63, and the sliding sleeve 63 is located in the through slot 431 and is pivotally connected to the through slot 631 through the second rotating shaft 45. The through slot 431 in the above design can ensure that when the intermediate rod 43 moves with the crankshaft disk 42, the intermediate rod 43 has a certain space for up and down movement, thereby ensuring that the up and down sliding of the sliding sleeve 63 is not affected. In other embodiments, a connecting plate can be provided on the outside of the sliding sleeve 63, and the connecting plate can be pivotally connected to the through slot 431 through a rotating shaft, thereby ensuring that the up and down movement of the intermediate rod 43 drives the sliding sleeve 63 to slide.

[0029] The specific working principle, such as Figure 4 As shown, Figure 4 It is a signal transmission flow chart of an embodiment of a horizontal ultra-high pressure pump without eccentric wear of the present application. The turntable 41 is driven to rotate by other motors, so that the crankshaft disk 42 is periodically reciprocated along the turntable 41, thereby driving the universal coupling 6 and the connecting rod 5 to reciprocate back and forth, and finally making the plunger 21 reciprocate in the cylinder sleeve 1. By detecting the reciprocating motion (i.e., displacement signal) of the connection between the plunger joint 22 and the plunger 21, a pulse signal is generated for feedback. In the push stroke or return stroke, if the sensor 32 detects the push stroke signal, that is, outputs a low level, the servo motor 34 does not operate; if the return stroke signal is output as a high level, the signal is transmitted to the controller 33, and then the servo motor 34 is driven by the driver to rotate a certain angle. In this embodiment, the controller 33 can be a PLC module, so as to control the motor rotation according to the preset program, thereby driving the plunger 21 to rotate. Since the pressure is relatively large when the plunger 21 is extended, in order to ensure the rotation effect of the plunger 21, the plunger 21 is required to rotate only during the return stroke, and not during the push stroke. Therefore, the servo motor 34 performs periodic intermittent motion. A sensor 32 is installed above the plunger 21. By detecting the reciprocating motion (i.e., displacement signal) of the connection between the plunger joint 22 and the plunger 21, a pulse signal is generated for feedback. In the push stroke or return stroke, if the sensor 32 detects a push stroke signal, that is, outputs a low level, the servo motor 34 does not operate; if it is a return stroke signal, that is, the output is a high level, the signal is transmitted to the controller 33, and then the servo motor 34 rotates a certain angle, and then the gear engages with the tooth profile 24 of the plunger joint 22, and the plunger joint 22 is connected to drive the plunger 21 to rotate intermittently. Exemplarily, for example, the ultra-high pressure plunger 21 performs about 40 reciprocating motions per minute, and the rotation speed of the plunger 21 is reasonably determined to ensure uniform eccentric wear, that is, one rotation per minute, each rotation of 9°, and its rotation angle is controlled by the servo motor 34.

[0030] In summary, the structure provided by the present application utilizes a mechanical structure to enable the plunger joint 22 to drive the plunger 21 to rotate a certain angle in each return stroke, and the circumferential surface of the plunger 22 is uniformly formed into the ground end, that is, the wear between the plunger and the guide surface caused by gravity is uniform, thereby greatly improving the service life of the plunger 22 and improving economic benefits. In addition, this mechanical system processes the tooth profile 24 on the plunger joint, which has better rigidity and strength than directly processing the tooth profile on the plunger 22. The sensor detection device performs closed-loop monitoring of the plunger movement, and has the advantage of high-precision control.

[0031] The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A horizontal ultra-high pressure pump without eccentric wear, characterized in that: include: Cylinder liner, plunger assembly, motor assembly and crankshaft assembly; The plunger assembly includes a plunger and a plunger joint, the plunger is connected to one end of the plunger joint and is slidably sleeved in the cylinder sleeve, the other end of the plunger joint is provided with an opening, the opening is sleeved with a connecting rod, and the connecting rod is connected to the crankshaft assembly through a universal coupling; the motor assembly includes a transmission gear, and the outer side of the end of the plunger joint close to the plunger is provided with a tooth profile, and the transmission gear is meshed with the tooth profile; wherein, when the crankshaft assembly pulls the plunger to retract, the transmission gear drives the plunger joint to rotate; in the extension direction of the plunger, the length of the transmission gear is less than the length of the tooth profile, wherein the gear teeth of the transmission gear are slidably arranged along the tooth profile; when the plunger is in an extended state, the transmission gear is meshed with the front end of the tooth profile; when the plunger is in a retracted state, the transmission gear is meshed with the rear end of the tooth profile.

2. A horizontal ultra-high pressure pump without eccentric wear according to claim 1, characterized in that: A pressure cover is provided on the outside of the opening, and the connecting rod is located in the opening and connected to the opening through a thrust bearing, wherein the inner diameter of the pressure cover is smaller than the outer diameter of the thrust bearing.

3. A horizontal ultra-high pressure pump without eccentric wear according to claim 2, characterized in that: The universal coupling includes an arc plate, a sliding rod and a sliding sleeve. The sliding rod is fixed to both sides of the concave portion of the arc plate. The sliding sleeve is slidably mounted on the sliding rod. The middle end of the convex portion of the arc plate is connected to the connecting rod.

4. The non-uniform wear horizontal ultra-high pressure pump according to claim 3, characterized in that: The crankshaft assembly includes a turntable, a crankshaft disc and an intermediate rod. The crankshaft disc is movably connected to the turntable via a movable shaft. The convex end of the crankshaft disc is connected to one side of the intermediate rod, and the other side of the intermediate rod is movably connected to the sliding sleeve.

5. The non-biased wear horizontal ultra-high pressure pump according to claim 4, characterized in that: The movable axis is located between the center and the edge of the circle in the rotating disk.

6. The non-biased wear horizontal ultra-high pressure pump according to claim 4, characterized in that: A through slot is provided at one end of the intermediate rod connected to the sliding sleeve. The sliding sleeve is located in the through slot and is pivotally connected to the through slot via a second rotating shaft.

7. The non-uniform wear horizontal ultra-high pressure pump according to claim 1, characterized in that: The motor assembly further comprises a sensor, a controller and a servo motor. The controller is connected to the sensor and the servo motor respectively. The rotating shaft of the servo motor is sleeved with the transmission gear.

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