An ultrahigh pressure cylinder plunger pump device

Abstract

The application discloses an ultrahigh-pressure oil cylinder plunger pump device and relates to the technical field of plunger pumps. The device comprises a plunger pump body, which is assembled at the output end of an oil cylinder. The plunger pump body comprises a pump shaft, a pump cylinder and a pump base. The pump cylinder is in sliding sealing connection with the output end of the oil cylinder. One end of the pump shaft is in sliding sealing connection with the pump cylinder, and the other end of the pump shaft is in fixed connection with the pump base. The inner cavity of the pump base is in communication with the inner cavity of the pump cylinder through the inner cavity of the pump shaft. The inner cavity of the pump cylinder serves as a pressure-bearing space. The pump cylinder is inserted into a piston piece, the piston piece is combined with the pump cylinder to form the pressure-bearing space, and the pump cylinder reciprocates on the pump shaft to draw liquid into the pressure-bearing space from the pump shaft. The overall occupied space of the oil cylinder and the pump body is shortened. The pump cylinder is sleeved with the piston piece, the wall thickness is reduced, the pressure-bearing effect is ensured, and the overall volume is further reduced.

Description

Technical Field

[0001] This invention relates to the field of piston pumps, and more particularly to an ultra-high pressure hydraulic cylinder piston pump device. Background Technology

[0002] Ultra-high pressure hydraulic systems have advantages such as reducing installed weight, improving equipment manufacturing level, saving installation space and achieving high system integration. They are in high demand in many fields such as aerospace, shipbuilding, metallurgy, and construction machinery, and are one of the current development directions of the hydraulic industry.

[0003] Hydraulic pumps are the core power components that ensure the operation of hydraulic systems. Extremely high pressure can cause failures such as increased internal load on the piston pump, enhanced fluid-structure-thermal multi-field coupling effect, and jamming of key friction pairs in the piston pump.

[0004] Patent CN109812392B discloses a novel ultra-high pressure plunger pump, belonging to the field of ultra-high pressure hydraulic pumps. The invention includes a housing, cylinders mounted opposite each other at both ends of the housing, a main shaft penetrating the cylinders and located inside the housing, and double-sided swashplates coaxially mounted with the main shaft; thrust ball bearings are provided on both sides of the double-sided swashplates; multiple plunger assemblies, with their tops compressed by the thrust ball bearings, are evenly distributed radially around the main shaft on the cylinders; the oil inlet of each plunger assembly is connected to the oil outlet of a shuttle valve.

[0005] By increasing the number of plungers, it changes from a single cylinder to a multi-cylinder system to ensure output pressure. However, under ultra-high pressure conditions, the plungers are still affected by high temperature, which increases the internal load of the plunger pump, enhances the fluid-structure-thermal multi-field coupling effect, and if one plunger breaks while multiple plungers are working, the transmission between the double-sided balance swashplate and the remaining plunger is immediately affected, leading to pump damage. It cannot fundamentally solve the impact of high pressure on the plungers.

[0006] Currently, there is another type of plunger pump that uses a hydraulic cylinder as its power source to ensure the output pressure of the plunger pump. However, in current hydraulic cylinder plunger pumps, the piston shaft and the plunger of the plunger pump are connected by a connector, resulting in a long overall length. When used in external machinery, sufficient installation space needs to be reserved, making it unusable in some machinery with insufficient installation space. Furthermore, to ensure pressure resistance, current high-pressure plunger pumps require very thick cylinder walls, further increasing the overall size. Summary of the Invention

[0007] (a) Purpose of the invention

[0008] In view of this, the purpose of this invention is to propose an ultra-high pressure hydraulic cylinder plunger pump device, which combines the plunger with the piston of the hydraulic cylinder. The plunger is hollow inside, allowing the oil to flow from inside the plunger and be directly pumped and discharged through the piston of the hydraulic cylinder, thereby reducing the overall volume. Furthermore, the piston of the hydraulic cylinder adopts a double or multi-cylinder sleeve design, which reduces the wall thickness while ensuring the pressure bearing effect, further reducing the overall volume.

[0009] (II) Technical Solution

[0010] To achieve the above-mentioned technical objectives, the present invention provides an ultra-high pressure hydraulic cylinder plunger pump device:

[0011] It includes a plunger pump body, which is mounted on the output end of the hydraulic cylinder;

[0012] The plunger pump body includes a pump shaft, a pump barrel, and a pump base. The pump barrel is slidably and sealed to the output end of the oil cylinder. One end of the pump shaft is slidably and sealed to the pump barrel, and the other end of the pump shaft is fixedly connected to the pump base. The inner cavity of the pump base communicates with the inner cavity of the pump barrel through the inner cavity of the pump shaft.

[0013] The inner cavity of the pump barrel serves as a pressure-bearing space. When the pump barrel reciprocates along the output end of the oil cylinder, the pump shaft and pump base are used to draw external liquid into the pressure-bearing space or to discharge liquid from the pressure-bearing space.

[0014] Preferably, when the pump barrel extends along the output end of the cylinder, the pressure space is compressed, and the pump shaft and pump base are used to discharge the liquid in the pressure space.

[0015] When the pump barrel returns to its original position along the output end of the cylinder, the pump shaft and pump base draw external liquid into the pressurized space.

[0016] Preferably, an inlet check valve for liquid inlet and an outlet check valve for liquid outlet are respectively inserted and fixed on both sides of the pump base.

[0017] Preferably, the end of the pump shaft is fixed with a fixing sleeve for pressing the sealing ring, and the sealing ring is fitted and fixed on the fixing sleeve.

[0018] Preferably, the hydraulic cylinder includes a cylinder barrel, a piston, a cylinder seat, and a fixed rod. The piston is slidably and sealed to the cylinder barrel. The piston is hollow inside, and the pump barrel is inserted inside the piston and is interference-fitted with the piston. The cylinder seats are distributed at both ends of the cylinder barrel, and the fixed rod is fixed at both ends of one of the cylinder seats. One end of the fixed rod is fixedly connected to the other cylinder seat, and the other end of the fixed rod is fixedly connected to the pump seat.

[0019] Preferably, the outer surface of the cylinder seat is provided with a liquid passage hole for liquid passage.

[0020] Preferably, the piston assembly includes a piston and piston tubes fixed on both sides of the piston, with the two piston tubes passing through cylinder seats at both ends of the cylinder and slidably connected to the cylinder seats.

[0021] Preferably, there are two plunger pump bodies, which are located at both ends of the cylinder, and the pump barrels of the two plunger pump bodies are respectively inserted into the two piston tubes.

[0022] Preferably, the inner cavity of the pump barrel is connected to the inner cavity of the piston tube, and the end of the piston tube is equipped with a pressure regulating mechanism for adjusting the size of the pressure-bearing space. The pressure regulating mechanism includes an adjusting component and an adjusting drive component. The adjusting component is mounted on the pump barrel, and the adjusting drive component is used to control the adjusting component to drive the pump barrel.

[0023] Preferably, the pressure regulating mechanism further includes a fixed box and a box cover. The box cover is fixed on the fixed box, and the fixed box is fixed on the piston tube. The regulating component consists of a drive sleeve, a worm gear, and a connecting block. The pump tube is threadedly connected to the piston tube, and the drive sleeve is slidably and sealingly connected to the pump tube. A worm wheel is integrally fixed on the outer periphery of the drive sleeve. The connecting block is fixed on the fixed box, and both ends of the worm gear are rotatably connected to the connecting block.

[0024] Preferably, the adjustment drive assembly consists of a driven bevel gear, a servo motor, and an active bevel gear. The driven bevel gear is fixed to the end of the worm gear, the active bevel gear is fixedly connected to the output end of the servo motor, and the servo motor is fixed inside a mounting box.

[0025] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0026] 1: By inserting the pump barrel into the piston assembly, the piston assembly and the pump barrel are directly combined to form a pressure-bearing space. The pump barrel reciprocates on the pump shaft, drawing liquid from the pump shaft into the pressure-bearing space. This shortens the overall space occupied by the cylinder and pump body. Furthermore, the fitting of the pump barrel and piston assembly reduces the wall thickness while ensuring pressure-bearing effect, further reducing the overall volume.

[0027] 2: By assembling a pressure regulating mechanism on the piston to adjust the size of the pressure-bearing space, when the plunger pump body operates at high pressure for a long time, the position of the pump barrel in the piston tube can be adjusted through the pressure regulating component, changing the size of the pressure-bearing space, increasing the upper limit of the pressure, reducing the pressure burden on the plunger pump body, and further ensuring the pressure-bearing effect and the service life of the plunger pump body. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 provided by the present invention;

[0030] Figure 2 This is a side view structural diagram of Embodiment 1 provided by the present invention;

[0031] Figure 3 Provided by the present invention Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0032] Figure 4 Provided by the present invention Figure 2 Schematic diagram of the cross-sectional structure at point BB;

[0033] Figure 5 Provided by the present invention Figure 1 Schematic diagram of the overall structure of the central plunger pump body;

[0034] Figure 6 Provided by the present invention Figure 2 A schematic diagram of the overall structure of the piston and pump cylinder;

[0035] Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 provided by the present invention;

[0036] Figure 8 Provided by the present invention Figure 7 A schematic diagram of the overall structure of the piston component;

[0037] Figure 9 A cross-sectional view of Embodiment 2 provided by the present invention;

[0038] Figure 10 This is a schematic diagram of the overall structure of Embodiment 2 provided by the present invention;

[0039] Figure 11 Provided by the present invention Figure 10 A schematic diagram of a partial explosion of the pressure regulating mechanism;

[0040] Figure 12 This is a schematic diagram of the connection cross-sectional structure of the drive sleeve and the pump cylinder in Embodiment 2 of the present invention.

[0041] In the diagram: 1. Hydraulic cylinder; 11. Cylinder barrel; 12. Piston assembly; 121. Piston; 122. Piston tube; 13. Cylinder seat; 131. Fluid passage; 14. Fixed rod; 2. Plunger pump body; 21. Pump seat; 211. Inlet check valve; 212. Outlet check valve; 22. Pump shaft; 221. Fixed sleeve; 23. Pump barrel; 3. Pressure regulating mechanism; 31. Fixed box; 32. Box cover; 33. Drive sleeve; 331. Worm gear; 34. Worm; 35. Connecting block; 36. Driven bevel gear; 37. Servo motor; 38. Active bevel gear. Detailed Implementation

[0042] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0043] Reference Figure 1-12 :

[0044] Example 1

[0045] An ultra-high pressure hydraulic cylinder plunger pump device includes a hydraulic cylinder 1 consisting of a cylinder barrel 11, a piston 12, a cylinder seat 13, and a fixing rod 14. The cylinder seat 13 is fixed to both ends of the cylinder barrel 11 by the fixing rod 14. The piston 12 is slidably connected to the cylinder barrel 11. A sealing ring is provided between the cylinder seat 13 and the cylinder barrel 11 to ensure a seal between them. A liquid passage hole 131 for liquid passage is opened on the outer surface of the cylinder seat 13. Figure 1 and Figure 3 As shown, the piston 12 can be driven to move within the cylinder 11 by supplying oil to the fluid passage 131 through an external oil pump.

[0046] Furthermore, such as Figure 1 , Figure 3 and Figure 6As shown, a plunger pump body 2 is assembled at the end of the piston component 12. The plunger pump body 2 consists of a pump seat 21, a pump shaft 22, and a pump barrel 23. A fixing rod 14 is fixed to both sides of one of the cylinder seats 13. The end of one fixing rod 14 is locked to the other cylinder seat 13 by a nut, and the other fixing rod 14 is locked to the pump seat 21 by a nut. The piston component 12 is hollow inside, and the pump barrel 23 is inserted into the piston component 12 and is interference-fitted with the piston component 12. Thus, the pump barrel 23 and the piston component 12 are... 2. The pump barrel 23 and piston 12 are integrated internally and externally. The overall length of the pump barrel 23 and piston 12 is significantly shortened compared to the traditional end connection. The pump barrel 23 is internally connected, and the pump shaft 22 can slide inside the pump barrel 23. The inner cavity of the piston 12 and the inner cavity of the pump barrel 23 form a pressure-bearing space. The other end of the pump shaft 22 is fixedly connected to the pump seat 21. The inner cavity of the pump seat 21 is connected to the inner cavity of the pump barrel 23 through the inner cavity of the pump shaft 22. By sliding the pump barrel 23 on the pump shaft 22 and utilizing the internal and external pressure difference, liquid pumping and discharging can be completed.

[0047] Furthermore, such as Figure 5 As shown, an inlet check valve 211 for liquid inlet and an outlet check valve 212 for liquid outlet are respectively inserted and fixed on both sides of the pump base 21. When the pump barrel 23 is away from the pump base 21, the external liquid is drawn into the pump shaft 22 and the pressure-bearing space through the inlet check valve 211. Conversely, the liquid in its internal space is discharged through the outlet check valve 212.

[0048] like Figure 1 and Figure 5 As shown, a fixed sleeve 221 for pressing the sealing ring is fixed at the end of the pump shaft 22, and the sealing ring is sleeved and fixed on the fixed sleeve 221. The sealing ring is composed of a static sealing ring and a dynamic sealing ring, which fully ensures the sealing between the pump shaft 22 and the pump barrel 23.

[0049] Example 2

[0050] An ultra-high pressure hydraulic cylinder plunger pump device, which, based on Embodiment 1, such as... Figure 7 , Figure 8 and Figure 9 As shown, the piston component 12 consists of a piston 121 and piston tubes 122 fixed on both sides of the piston 121. The piston tubes 122 are the output ends of the hydraulic cylinder 1. The two piston tubes 122 pass through the cylinder seats 13 at both ends of the cylinder barrel 11 and are slidably connected to the cylinder seats 13. There are two plunger pump bodies 2. The two plunger pump bodies 2 are respectively mounted on the two piston tubes 122. The pump cylinders 23 in the two plunger pump bodies 2 are respectively inserted into the two piston tubes 122. When the piston 121 moves with the piston tubes 122 in the cylinder barrel 11, the two plunger pump bodies 2 can work alternately. When the left plunger pump body 2 receives liquid, the right plunger pump body 2 can discharge liquid, making full use of the power of the hydraulic cylinder 1.

[0051] Example 3

[0052] An ultra-high pressure hydraulic cylinder plunger pump device, which is based on Embodiments 1 and 2, such as... Figure 10 , Figure 11 and Figure 12 As shown, the end of the piston tube 122 is equipped with a pressure regulating mechanism 3 for adjusting the size of the pressure-bearing space. The pressure regulating mechanism 3 includes an adjusting component and an adjusting drive component. The adjusting component is mounted on the pump cylinder 23, and the adjusting drive component is used to control the adjusting component to drive the pump cylinder 23. The pressure regulating mechanism 3 also includes a fixed box 31 and a box cover 32. The box cover 32 is fixed on the fixed box 31, and the fixed box 31 is fixed on the piston tube 122. The adjusting component consists of a drive sleeve 33, a worm gear 34, and a connecting block 35. The pump cylinder 23 is threadedly connected to the piston tube 122. It is worth mentioning that the half of the pump cylinder 23 closest to the piston 121 is threadedly connected to the piston tube 122, and the other half of the pump cylinder 23 is slidably connected to the drive sleeve 33. The drive sleeve 33 and the pump cylinder 23 are slidably and sealingly connected. (Refer to the attached diagram.) Figure 12 The drive sleeve 33 has uniformly raised interior sections. The rear half of the pump cylinder 23 has a groove on its outer surface that matches the raised sections of the drive sleeve 33. The raised sections slide against the groove, and the drive sleeve 33 can also drive the pump cylinder 23 to rotate through the connection between the raised sections and the groove. A worm gear 331 is integrally fixed to the outer periphery of the drive sleeve 33. The connecting block 35 is fixed to the fixed box 31. The two ends of the worm 34 are rotatably connected to the connecting block 35. The worm 34 drives the worm gear 331 to rotate. When the drive sleeve 33 drives the pump cylinder 23 to rotate, the pump cylinder 23 changes position in the piston tube 122 under the action of the thread, thereby changing the size of the pressure-bearing space formed by the piston tube 122 and the pump cylinder 23. After the plunger pump body 2 has been working for a long time, the internal pressure of the plunger pump body 2 can be reduced by changing the size of the pressure-bearing space. The ends of the piston tube 122 and the pump cylinder 23 are dynamically sealed to ensure the sealing performance after adjustment. The sealing method is a public technology and will not be described in detail here.

[0053] Furthermore, such as Figure 11 As shown, the adjustment drive assembly consists of a driven bevel gear 36, a servo motor 37, and a driven bevel gear 38. The driven bevel gear 36 is fixed to the end of the worm gear 34, and the driven bevel gear 38 is fixedly connected to the output end of the servo motor 37. The servo motor 37 is fixed inside the fixed box 31. By driving the driven bevel gear 38 to rotate through the servo motor 37, the driven bevel gear 36 can drive the worm gear 34 to rotate, thereby driving the worm wheel 331.

[0054] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A high-pressure hydraulic cylinder plunger pump device, characterized in that, Includes a plunger pump body (2), which is mounted on the output end of the cylinder (1); The plunger pump body (2) includes a pump shaft (22), a pump barrel (23) and a pump seat (21). The pump barrel (23) is slidably and sealed to the output end of the oil cylinder (1). One end of the pump shaft (22) is slidably and sealed to the pump barrel (23), and the other end of the pump shaft (22) is fixedly connected to the pump seat (21). The inner cavity of the pump seat (21) is connected to the inner cavity of the pump barrel (23) through the inner cavity of the pump shaft (22). The inner cavity of the pump cylinder (23) serves as a pressure-bearing space. When the pump cylinder (23) reciprocates along the output end of the oil cylinder (1), the pump shaft (22) and the pump seat (21) are used to draw external liquid into the pressure-bearing space or to discharge liquid from the pressure-bearing space. The hydraulic cylinder (1) includes a cylinder barrel (11) and a piston component (12), wherein the piston component (12) is slidably and sealedly connected to the cylinder barrel (11); the piston component (12) includes a piston (121) and piston tubes (122) fixed on both sides of the piston (121), wherein the pump barrel (23) is inserted inside the piston tube (122); The inner cavity of the pump cylinder (23) is connected to the inner cavity of the piston tube (122). The end of the piston tube (122) is equipped with a pressure regulating mechanism (3) for adjusting the size of the pressure-bearing space. The pressure regulating mechanism (3) includes an adjusting component and an adjusting drive component. The adjusting component is mounted on the pump cylinder (23). The pressure regulating mechanism (3) also includes a fixed box (31) and a box cover (32). The box cover (32) is fixed on the fixed box (31). The fixed box (31) is fixed on the piston tube (122). The regulating component consists of a drive sleeve (33), a worm (34) and a connecting block (35). The pump cylinder (23) is threadedly connected to the piston tube (122). The drive sleeve (33) is slidably sealed to the pump cylinder (23). A worm wheel (331) is integrally fixed on the outer periphery of the drive sleeve (33). The connecting block (35) is fixed on the fixed box (31). The two ends of the worm (34) are rotatably connected to the connecting block (35) respectively. The drive sleeve (33) has uniform protrusions inside. The outer surface of the rear half of the pump cylinder (23) is provided with a sliding groove that matches the protrusions on the surface of the drive sleeve (33). The protrusions of the drive sleeve (33) slide with the sliding groove. The drive sleeve (33) drives the pump cylinder (23) to rotate through the connection between the protrusions and the sliding groove. The adjustment drive assembly consists of a driven bevel gear (36), a servo motor (37), and an active bevel gear (38). The driven bevel gear (36) is fixed to the end of the worm gear (34), the active bevel gear (38) is fixedly connected to the output end of the servo motor (37), and the servo motor (37) is fixed inside the fixing box (31). The adjustment drive assembly is used to control the adjustment assembly to drive the pump cylinder (23) to change its position inside the piston tube (122), thereby changing the size of the pressure-bearing space formed by the piston tube (122) and the pump cylinder (23).

2. The ultra-high pressure hydraulic cylinder plunger pump device according to claim 1, characterized in that, When the pump barrel (23) extends along the output end of the cylinder (1), the pump shaft (22) and the pump base (21) are used to discharge the liquid in the pressure space; When the pump barrel (23) is reset along the output end of the oil cylinder (1), the pump shaft (22) and the pump base (21) draw external liquid into the pressure space.

3. The ultra-high pressure hydraulic cylinder plunger pump device according to claim 1, characterized in that, The pump base (21) is fixed with an inlet check valve (211) for liquid inlet and an outlet check valve (212) for liquid outlet on both sides.

4. The ultra-high pressure hydraulic cylinder plunger pump device according to claim 1, characterized in that, The pump shaft (22) is fixed at the end with a fixing sleeve (221) for pressing the sealing ring, and the sealing ring is fitted and fixed on the fixing sleeve (221).

5. The ultra-high pressure hydraulic cylinder plunger pump device according to claim 1, characterized in that, The cylinder (1) also includes a cylinder seat (13) and a fixing rod (14), wherein the cylinder seat (13) is fixed to both ends of the cylinder barrel (11) by the fixing rod (14).

6. The ultra-high pressure hydraulic cylinder plunger pump device according to claim 5, characterized in that, Two plunger pump bodies (2) are provided, and the two plunger pump bodies (2) are located at both ends of the cylinder (11). A fixing rod (14) is also provided between the pump seat (21) of the plunger pump body (2) and the corresponding cylinder seat (13).

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