CN109185091B - Direct-drive hydraulic pump - Google Patents
Direct-drive hydraulic pump Download PDFInfo
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- CN109185091B CN109185091B CN201811194009.5A CN201811194009A CN109185091B CN 109185091 B CN109185091 B CN 109185091B CN 201811194009 A CN201811194009 A CN 201811194009A CN 109185091 B CN109185091 B CN 109185091B
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- pressure plunger
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- oil
- cavity
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses a direct-drive hydraulic pump, which comprises a pump head (1) and a crankshaft (2) arranged in the center of the pump head (1) and in running fit with the pump head (1), wherein a low-pressure plunger pair (3) and a high-pressure plunger pair (4) which are radially arranged along the pump head (1) and are matched with the crankshaft (2) are arranged at the end part of the crankshaft (2), a low-pressure oil cavity (5) is arranged in the pump head (1), a first oil inlet (6) is arranged at one side of the low-pressure oil cavity (5), oil flows out from a first oil outlet (7) at one side of the low-pressure plunger pair (3) through pressurization after entering the low-pressure plunger pair (3) from the first oil inlet (6), a second oil inlet (8) is arranged at one side of the high-pressure plunger pair (4), and a second oil outlet (9) is arranged at the other side of the high-pressure plunger pair (4). The invention provides a direct-drive hydraulic pump which is stable in starting, small in noise, small in impact on the internal structure of the pump head and long in service life.
Description
Technical Field
The invention relates to the technical field of hydraulic machinery, in particular to a direct-drive hydraulic pump.
Background
The traditional booster pump adopts the form that high-pressure plunger pair directly drives, and high-pressure plunger pair just starts work when the booster pump is opened, can cause huge impact to subassembly and motor in the pump head like this, leads to the pump head to start the shake big, noise is loud, influences the life of pump head.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the direct-drive hydraulic pump is stable in starting, small in noise, small in impact on the internal structure of the pump head and long in service life.
The invention solves the problems by adopting the following technical scheme: the utility model provides a direct-drive hydraulic pump, includes the pump head, establishes at pump head center and pump head normal running fit's bent axle, the bent axle tip is equipped with along the radial setting of pump head and with bent axle complex low pressure plunger pair and high pressure plunger pair, be equipped with the low pressure oil pocket in the pump head, low pressure oil pocket one side is equipped with first oil inlet, and the fluid flows out from the first oil-out of low pressure plunger pair one side through the pressurization after getting into low pressure plunger pair from first oil inlet, high pressure plunger pair one side is equipped with the second oil inlet, high pressure plunger pair opposite side is equipped with the second oil-out, first oil-out and second oil inlet intercommunication, be equipped with the unidirectional structure that is used for inject fluid from low pressure plunger pair unidirectional conduction to high pressure plunger pair between first oil-out and the second oil inlet.
Compared with the prior art, the invention has the advantages that: when the pump head is started, oil enters the low-pressure oil cavity from the first oil inlet, the low-pressure plunger pair starts to work, oil is added to low pressure and enters the second oil inlet through the first oil outlet, then enters the high-pressure plunger pair through the unidirectional structure, the high-pressure plunger pair subsequently works to pressurize, high-pressure oil enters the pump body through the second oil outlet, if the low-pressure plunger pair does not work to supply oil, no oil in the high-pressure plunger pair does not carry out high-pressure pressurization, namely, the low-pressure plunger pair is started firstly, the high-pressure plunger pair is started later, the technical problem that the traditional booster pump frequently starts the high-pressure plunger pair and also frequently starts to impact the pump head is solved, low-pressure oil enters firstly, high-pressure oil is generated later, impact on parts in the pump head is small, the whole operation of the pump head is stable, the noise is small, the service life is long, and the unidirectional structure is used for limiting the oil to flow from the low-pressure plunger pair to the high-pressure plunger pair only, and oil backflow is avoided.
According to the invention, the one-way structure comprises a first one-way valve arranged at the first oil outlet and/or a second one-way valve arranged at the second oil inlet, and by the improvement, the one-way valve can be arranged on the first oil outlet or the second oil inlet so as to prevent oil from flowing back from the high-pressure plunger pair to the low-pressure plunger pair, and the one-way valve can also be arranged on the first oil outlet and the second oil inlet so as to ensure that oil cannot flow back from the high-pressure plunger pair to the low-pressure plunger pair.
According to the invention, the first check valve comprises a first valve cavity, a first valve seat, a first elastic piece and a first blocking piece, wherein the first valve seat is arranged in the first valve cavity, the first valve seat is provided with a first oil hole communicated with a first oil outlet, one end of the first elastic piece is propped against the end face of the first valve cavity, the other end of the first elastic piece elastically props against the first oil hole, the direction that the first blocking piece leaves the first valve seat is consistent with the direction that oil enters the high-pressure plunger pair from the low-pressure plunger pair, the low-pressure plunger pair works, the oil pushes the first blocking piece open after being pressurized by the low-pressure plunger pair, the first blocking piece compresses the first elastic piece and leaves the first valve seat, the first oil hole is opened, the oil flows out from the first oil outlet into the second oil inlet, and if the pressure of the oil of the low-pressure plunger pair is insufficient, the first blocking piece is elastically pressed on the first blocking piece, and the first oil hole is blocked, so that the oil can only flow from the low-pressure plunger pair to the high-pressure plunger pair unidirectionally.
The second check valve comprises a second valve cavity, a second valve seat, a second elastic member and a second blocking member, wherein the second valve seat is arranged in the second valve cavity, the second valve seat is provided with a second oil hole communicated with a second oil inlet, one end of the second elastic member is propped against the end face of the second valve cavity, the other end of the second elastic member elastically props against the second oil hole, the direction of the second blocking member leaving the second valve seat is consistent with the direction of oil entering the high-pressure plunger pair from the low-pressure plunger pair, and by the improvement, when the second check valve works, low-pressure oil flowing out of the first oil outlet props up the second blocking member, the second blocking member overcomes the elasticity of the second elastic member and moves away from the second valve seat, the second oil hole is opened, the oil enters the high-pressure plunger pair, and when the oil pressure of the low-pressure plunger pair is insufficient, the second blocking member is elastically pressed on the second oil hole, so that the oil can only flow from the low-pressure plunger pair to the high-pressure plunger pair unidirectionally.
As a further improvement of the invention, a first sealing structure is further arranged between the second valve seat and the high-pressure plunger pair, the first sealing structure comprises a first check ring, a first sealing ring and a first sealing groove arranged between the second valve seat and the high-pressure plunger pair, the first sealing groove is used for accommodating the first check ring and the first sealing ring, the first check ring is provided with a first sealing lip which is clamped between the second valve seat and the first sealing ring and can deform towards the second valve seat under the action of the pressure of the first sealing ring, by the improvement, the gap between the second valve seat and the high-pressure plunger pair is sealed through the first sealing structure, as the high-pressure oil liquid generates pressure on the first sealing structure, the first sealing lip is pressed to deform towards the second valve seat, and the gap between the first sealing structure and the second valve seat is sealed.
According to the invention, the first check ring is further provided with a second sealing lip which is clamped between the first sealing ring and the high-pressure plunger pair and can be pressed by the first sealing ring to deform towards the high-pressure plunger pair, through the improvement, the first sealing ring is pressed and deformed, and meanwhile, the second sealing lip is pressed and deformed towards the high-pressure plunger pair to further seal a gap between the first sealing structure and the high-pressure plunger pair, the larger the deformation of the first sealing ring is, the larger the deformation of the second sealing lip is, the better the sealing effect of the first sealing structure is, the first sealing lip and the second sealing lip are matched for sealing, and high-pressure oil is ensured not to flow out of a gap between the high-pressure plunger pair and the pump head and a gap between the second valve seat and the pump head.
As a further improvement of the invention, the low-pressure plunger pair comprises a low-pressure plunger seat, a low-pressure plunger cavity arranged in the low-pressure plunger seat, and a low-pressure plunger body movably matched in the low-pressure plunger cavity, one end of the low-pressure plunger body is propped against the crankshaft, the other end of the low-pressure plunger body is propped against the low-pressure plunger seat through a low-pressure plunger elastic piece, a third one-way valve used for limiting the oil to flow from the low-pressure oil cavity to the low-pressure plunger cavity only is arranged at the end of the low-pressure plunger seat far away from the low-pressure plunger body, one side of the low-pressure plunger seat is provided with a low-pressure oil outlet used for communicating the low-pressure plunger cavity with the first oil outlet, by the improvement, the low-pressure plunger body is driven by the crankshaft to move towards the low-pressure plunger cavity, the low-pressure plunger body is impacted by the oil pressure in the low-pressure plunger cavity, and then enters the first oil outlet towards the high-pressure plunger pair to flow, and the third one-way valve oil is used for limiting the oil to enter the low-pressure plunger cavity only from the low-pressure oil cavity, and backflow is avoided.
According to the invention, the third check valve comprises a third valve seat, a third blocking member, a third elastic member and a third retainer, wherein the third valve seat is arranged in the low-pressure plunger seat and is provided with a third oil hole for communicating the low-pressure oil cavity and the low-pressure plunger cavity, the third retainer is fixed between the third valve seat and the low-pressure plunger seat and is in clearance fit with the third valve seat and the low-pressure plunger seat, one end of the third blocking member abuts against the third oil hole of the third valve seat to block the oil hole, the other end of the third blocking member abuts against the third retainer through the third elastic member, when oil enters the low-pressure plunger cavity from the low-pressure oil cavity, the third blocking member is pushed to overcome the elastic force of the third elastic member to enable the third blocking member to move away from the third oil hole, by the improvement, the third blocking member is opened towards the third retainer by overcoming the elastic force of the third elastic member, the third blocking member enters the low-pressure plunger cavity from the low-pressure oil cavity, and when the third check valve does not work, the third blocking member can press the third blocking member into the low-pressure plunger cavity from the low-pressure oil cavity to ensure that the third blocking member can only elastically press the low-pressure plunger from the low-pressure oil hole.
The high-pressure plunger pair comprises a high-pressure plunger seat, a high-pressure plunger cavity arranged in the high-pressure plunger seat, and a high-pressure plunger body movably matched in the high-pressure plunger cavity, wherein one end of the high-pressure plunger body is propped against the crankshaft, the other end of the high-pressure plunger body is inserted in the high-pressure plunger cavity, oil enters the high-pressure plunger cavity from a second oil inlet and flows out of a second oil outlet through the pressurization of the high-pressure plunger body, the crankshaft drives the high-pressure plunger body to work, the high-pressure plunger body extrudes the high-pressure plunger cavity, and oil in the high-pressure plunger cavity flows out of the second oil outlet from low pressure to high pressure and flows into the pump body to work.
Drawings
Fig. 1 is a schematic front view of the overall structure of the present invention.
Figure 2 is a schematic cross-sectional view of the structure of figures 1 A-A.
FIG. 3 is a schematic cross-sectional view of the structure of FIGS. 1B-B.
Fig. 4 is an enlarged schematic view of fig. 2C.
Fig. 5 is an enlarged schematic view of fig. 3D.
Fig. 6 is a schematic structural view of a fourth check valve and a second sealing structure at the second oil outlet.
The figure shows: 1-pump head, 2-crankshaft, 3-low pressure plunger pair, 3.1-low pressure plunger seat, 3.2-low pressure plunger cavity, 3.3-low pressure plunger body, 3.4-low pressure plunger elastic member, 4-high pressure plunger pair, 4.1-high pressure plunger seat, 4.2-high pressure plunger cavity, 4.3-high pressure plunger body, 5-low pressure oil cavity, 6-first oil inlet, 7-first oil outlet, 8-second oil inlet, 9-second oil outlet, 10-first check valve, 10.1-first valve cavity, 10.2-first valve seat, 10.3-first elastic member, 10.4-first blocking member, 10.5-first oil hole, 11-second check valve, 11.1-second valve cavity, 11.2-second valve seat, 11.3-second elastic member, 11.4-second blocking member, 11.5-second oil hole, 12-first seal structure, 12.1-first retainer ring, 12.2-first seal ring, 12.3-first seal groove, 12.4-first seal lip, 12.5-second seal lip, 13-third check valve, 13.1-third valve seat, 13.2-third plug, 13.3-third elastic member, 13.4-third retainer, 13.5-third oil hole, 14-fourth check valve, 14.1-fourth valve cavity, 14.2-fourth valve seat, 14.3-fourth elastic member, 14.4-fourth oil hole, 14.5-fourth plug, 15-second seal structure, 15.1-second seal lip, 15.2-second seal ring, 15.3-second seal groove, 15.4-third seal lip, 15.5-fourth seal lip.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in figures 1-6 of the drawings,
a direct drive hydraulic pump, characterized by: the novel oil pump comprises a pump head 1, and a crankshaft 2 arranged in the center of the pump head 1 and in running fit with the pump head 1, wherein the end part of the crankshaft 2 is provided with a low-pressure plunger pair 3 and a high-pressure plunger pair 4 which are radially arranged along the pump head 1 and are matched with the crankshaft 2, a low-pressure oil cavity 5 is arranged in the pump head 1, one side of the low-pressure oil cavity 5 is provided with a first oil inlet 6, oil flows out from a first oil outlet 7 on one side of the low-pressure plunger pair 3 through pressurization after entering the low-pressure plunger pair 3 from the first oil inlet 6, one side of the high-pressure plunger pair 4 is provided with a second oil inlet 8, the other side of the high-pressure plunger pair 4 is provided with a second oil outlet 9, the first oil outlet 7 is communicated with the second oil inlet 8, and a unidirectional structure for limiting the unidirectional conduction of the oil from the low-pressure plunger pair 3 to the high-pressure plunger pair 4 is arranged between the first oil outlet 7 and the second oil inlet 8.
Wherein the one-way structure comprises a first one-way valve 10 arranged at the first oil outlet 7 and/or a second one-way valve 11 arranged at the second oil inlet 8.
The first check valve 10 comprises a first valve cavity 10.1, a first valve seat 10.2, a first elastic element 10.3 and a first blocking element 10.4, wherein the first valve seat 10.2 is arranged in the first valve cavity 10.1, the first valve seat 10.2 is provided with a first oil hole 10.5 communicated with the first oil outlet 7, one end of the first elastic element 10.3 abuts against the end face of the first valve cavity 10.1, the other end elastically abuts against the first blocking element 10.4 on the first oil hole 10.5, and the direction of the first blocking element 10.4 leaving the first valve seat 10.2 is consistent with the direction of oil entering the high-pressure plunger pair 4 from the low-pressure plunger pair 3.
The second check valve 11 comprises a second valve cavity 11.1, a second valve seat 11.2, a second elastic piece 11.3 and a second blocking piece 11.4, wherein the second valve seat 11.2 is arranged in the second valve cavity 11.1, the second valve seat 11.2 is provided with a second oil hole 11.5 communicated with a second oil inlet 8, one end of the second elastic piece 11.3 abuts against the end face of the second valve cavity 11.1, the other end elastically abuts against the second blocking piece 11.4 on the second oil hole 11.5, and the direction of the second blocking piece 11.4 leaving the second valve seat 11.2 is consistent with the direction of oil entering the high-pressure plunger pair 4 from the low-pressure plunger pair 3.
The high-pressure plunger assembly is characterized in that a first sealing structure 12 is further arranged between the second valve seat 11.2 and the high-pressure plunger assembly 4, the first sealing structure 12 comprises a first check ring 12.1, a first sealing ring 12.2 and a first sealing groove 12.3 arranged between the second valve seat 11.2 and the high-pressure plunger assembly 4, the first sealing groove 12.3 is used for accommodating the first check ring 12.1 and the first sealing ring 12.2, and the first check ring 12.1 is provided with a first sealing lip 12.4 which is clamped between the second valve seat 11.2 and the first sealing ring 12.2 and can be pressed by the first sealing ring 12.2 to deform towards the second valve seat 11.2.
The first retainer ring 12.1 is further provided with a second sealing lip 12.5 which is clamped between the first sealing ring 12.2 and the high-pressure plunger pair 4 and can be pressed by the first sealing ring 12.2 to deform towards the high-pressure plunger pair 4.
The low-pressure plunger pair 3 comprises a low-pressure plunger seat 3.1, a low-pressure plunger cavity 3.2 arranged in the low-pressure plunger seat 3.1, and a low-pressure plunger body 3.3 movably matched in the low-pressure plunger cavity 3.2, one end of the low-pressure plunger body 3.3 is propped against the crankshaft 2, the other end of the low-pressure plunger body 3.3 is propped against the low-pressure plunger seat 3.1 through a low-pressure plunger elastic piece 3.4, a third one-way valve 13 used for limiting oil to flow from the low-pressure oil cavity 5 to the low-pressure plunger cavity 3.2 is arranged at the end of the low-pressure plunger seat 3.1 far away from the low-pressure plunger body 3.3, and the first oil outlet 7 is arranged at one side of the low-pressure plunger seat 3.1 and is used for enabling the oil of the low-pressure plunger cavity 3.2 to flow towards the high-pressure plunger pair 4.
The third check valve 13 includes a third valve seat 13.1, a third blocking member 13.2, a third elastic member 13.3, and a third retainer 11.4, where the third valve seat 13.1 is disposed in the low pressure plunger seat 3.1 and is provided with a third oil hole 11.5 for communicating the low pressure oil cavity 5 and the low pressure plunger cavity 3.2, the third retainer 11.4 is fixed between the third valve seat 13.1 and the low pressure plunger seat 3.1 and is in clearance fit with the third valve seat 13.1 and the low pressure plunger seat 3.1, one end of the third blocking member 13.2 abuts against the third oil hole 11.5 of the third valve seat 13.1 to block the third oil hole 11.5, the other end abuts against the third retainer 11.4 through the third elastic member 13.3, and when the oil enters the low pressure plunger cavity 3.2 from the low pressure oil cavity 5, the third blocking member 13.2 is pushed against the elastic member 13.3 so that the third blocking member 13.2 is moved away from the third oil hole 11.5.
The high-pressure plunger pair 4 comprises a high-pressure plunger seat 4.1, a high-pressure plunger cavity 4.2 arranged in the high-pressure plunger seat 4.1, and a high-pressure plunger body 4.3 movably matched in the high-pressure plunger cavity 4.2, one end of the high-pressure plunger body 4.3 is propped against the crankshaft 2, the other end of the high-pressure plunger body 4.3 is inserted in the high-pressure plunger cavity 4.2, oil enters the high-pressure plunger cavity 4.2 from the second oil inlet 8, and flows out from the second oil outlet 9 through pressurization of the high-pressure plunger body 4.3.
The second oil outlet 9 is further provided with a fourth check valve 14, the fourth check valve 14 comprises a fourth valve cavity 14.1, a fourth valve seat 14.2 arranged in the fourth valve cavity 14.1, a fourth elastic member 14.3 and a fourth blocking member 14.5, the fourth valve seat 14.2 is provided with a fourth oil hole 14.4 communicated with the second oil outlet 9, one end of the fourth elastic member 14.3 abuts against the end face of the fourth valve cavity 14.1, the other end elastically abuts against the fourth oil hole 14.4, the direction of the fourth blocking member 14.5 leaving the fourth valve seat 14.2 is consistent with the direction of oil flowing out of the pump head 1 from the high-pressure plunger pair 4, when the fourth check valve 14 works, the fourth blocking member 14.5 overcomes the elasticity of the fourth elastic member 14.3 and moves away from the fourth valve seat 14.2, the fourth elastic member 14.4 opens, and when the fourth plunger pair 4 is pressed out of the fourth valve seat 14.2, the fourth blocking member 14.5 can only press the oil to the outside of the pump head 1 from the high-pressure plunger pair 4, and therefore the fourth blocking member 14.5 can not press the oil to the high-pressure plunger pair 14.4 to the outside the high-pressure plunger pair 14.
The second sealing structure 15 comprises a second check ring 15.1, a second sealing ring 15.2 and a second sealing groove 15.3 arranged between the fourth valve seat 14.2 and the pump head 1, wherein the second sealing ring 15.1 is used for accommodating the second check ring 15.1 and the second sealing ring 15.2, the second check ring 15.1 is provided with a third sealing lip 15.4 which is clamped between the fourth valve seat 14.2 and the second sealing ring 15.2 and can be deformed by the second sealing ring 15.2 towards the fourth valve seat 14.2, the second check ring 15.1 is also provided with a fourth sealing lip 15.5 which is erected between the second sealing ring 15.2 and the pump head 1 and can be deformed by the second sealing ring 15.2, a gap between the fourth valve seat 14.2 and the high-pressure piston pair 4 is sealed through the second sealing structure, and the gap between the high-pressure piston pair 4 outside the pump head 1 is higher than the high-pressure piston pair 4 arranged in the pump head 1, and the gap is deformed towards the fourth sealing lip 15.2, and the deformation effect is further improved by the deformation of the sealing lip 15.5 is generated by the second sealing lip 15.2, and the deformation effect is further improved by the deformation of the sealing lip 15.2 is further improved when the second check ring 15.1 is pressed towards the fourth sealing lip 15.2 and the fourth sealing lip 15.2, and the fourth sealing lip 15 is deformed towards the fourth sealing lip 15.2 through the high-pressure pair 2, and the sealing lip 15 is deformed towards the sealing lip 15.2, and the sealing lip 15 is deformed more than the sealing lip 15 is deformed towards the sealing lip 15.2, and the sealing lip 15 is deformed towards the sealing structure is further, and the sealing lip is deformed towards the sealing lip 15.
The first elastic member 10.3, the second elastic member 11.3, the third elastic member 13.3, the fourth elastic member 14.3 and the low-pressure plunger elastic member 3.4 may be springs, and the magnitude of the elastic force is that the first elastic member 10.3 is smaller than the second elastic member 11.3 and smaller than the third elastic member 13.3 and smaller than the fourth elastic member 14.3, so as to ensure that the oil flows unidirectionally from the first oil inlet 6 to the use end outside the pump head 1 after being pressurized by the low-pressure plunger pair 3 and the high-pressure plunger pair 4.
The first blocking member 10.4, the second blocking member 11.4, and the fourth blocking member 14.5 may be spherical, so as to improve the blocking effect when the blocking members block, while the third blocking member 13.3 has no high requirement for completely blocking the third oil hole 13.5, and is configured as a plate shape in order to increase the flow rate.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (3)
1. A direct drive hydraulic pump, characterized by: the oil pump comprises a pump head (1), and a crankshaft (2) arranged in the center of the pump head (1) and in running fit with the pump head (1), wherein a low-pressure plunger pair (3) and a high-pressure plunger pair (4) which are radially arranged along the pump head (1) and are matched with the crankshaft (2) are arranged at the end part of the crankshaft (2), a low-pressure oil cavity (5) is arranged in the pump head (1), a first oil inlet (6) is arranged on one side of the low-pressure oil cavity (5), oil flows out from a first oil outlet (7) on one side of the low-pressure plunger pair (3) through pressurization after entering the low-pressure plunger pair (3) from the first oil inlet (6), a second oil inlet (8) is arranged on one side of the high-pressure plunger pair (4), a second oil outlet (9) is arranged on the other side of the high-pressure plunger pair (4), the first oil outlet (7) is communicated with the second oil inlet (8), and a unidirectional structure for limiting the oil to be conducted from the low-pressure plunger pair (3) to the high-pressure plunger pair (4) in a unidirectional way is arranged between the first oil outlet (7 and the second oil inlet (8).
The one-way structure comprises a first one-way valve (10) arranged at the first oil outlet (7) and/or a second one-way valve (11) arranged at the second oil inlet (8); the first one-way valve (10) comprises a first valve cavity (10.1), a first valve seat (10.2), a first elastic piece (10.3) and a first blocking piece (10.4) which are arranged in the first valve cavity (10.1), wherein the first valve seat (10.2) is provided with a first oil hole (10.5) communicated with a first oil outlet (7), one end of the first elastic piece (10.3) is propped against the end face of the first valve cavity (10.1), the other end elastically props the first blocking piece (10.4) against the first oil hole (10.5), and the direction of the first blocking piece (10.4) leaving the first valve seat (10.2) is consistent with the direction of oil entering the high-pressure plunger pair (4) from the low-pressure plunger pair (3);
the second one-way valve (11) comprises a second valve cavity (11.1), a second valve seat (11.2), a second elastic piece (11.3) and a second blocking piece (11.4) which are arranged in the second valve cavity (11.1), wherein the second valve seat (11.2) is provided with a second oil hole (11.5) communicated with a second oil inlet (8), one end of the second elastic piece (11.3) is propped against the end face of the second valve cavity (11.1), the other end elastically props the second blocking piece (11.4) against the second oil hole (11.5), and the direction of the second blocking piece (11.4) leaving the second valve seat (11.2) is consistent with the direction of oil entering the high-pressure plunger pair (4) from the low-pressure plunger pair (3); a first sealing structure (12) is further arranged between the second valve seat (11.2) and the high-pressure plunger pair (4), the first sealing structure (12) comprises a first check ring (12.1), a first sealing ring (12.2) and a first sealing groove (12.3) arranged between the second valve seat (11.2) and the high-pressure plunger pair (4), the first sealing groove (12.3) is used for accommodating the first check ring (12.1) and the first sealing ring (12.2), and the first check ring (12.1) is provided with a first sealing lip (12.4) which is clamped between the second valve seat (11.2) and the first sealing ring (12.2) and can be pressed by the first sealing ring (12.2) to deform towards the second valve seat (11.2);
the low-pressure plunger pair (3) comprises a low-pressure plunger seat (3.1), a low-pressure plunger cavity (3.2) arranged in the low-pressure plunger seat (3.1) and a low-pressure plunger body (3.3) movably matched in the low-pressure plunger cavity (3.2), one end of the low-pressure plunger body (3.3) is propped against the crankshaft (2), the other end of the low-pressure plunger body (3.3) is propped against the low-pressure plunger seat (3.1) through a low-pressure plunger elastic piece (3.4), a third one-way valve (13) used for limiting oil to flow from the low-pressure oil cavity (5) to the low-pressure plunger cavity (3.2) is arranged at the end of the low-pressure plunger seat (3.1), and the first oil outlet (7) is arranged at one side of the low-pressure plunger seat (3.2) and is used for enabling the oil in the low-pressure plunger cavity (3.2) to flow towards the high-pressure plunger pair (4); the third check valve (13) comprises a third valve seat (13.1), a third blocking piece (13.2), a third elastic piece (13.3) and a third retainer (13.4), wherein the third valve seat (13.1) is arranged in the low-pressure plunger seat (3.1) and is provided with a third oil hole (13.5) used for communicating the low-pressure oil cavity (5) and the low-pressure plunger cavity (3.2), the third retainer (13.4) is fixed between the third valve seat (13.1) and the low-pressure plunger seat (3.1) and in clearance fit with the third valve seat (13.1) and the low-pressure plunger seat (3.1), one end of the third blocking piece (13.2) is abutted against the third oil hole (13.5) of the third valve seat (13.1) so as to block the third oil hole (13.5), and the other end of the third retainer (13.4) is abutted against the third oil hole (13.4) through the third elastic piece (13.3), and when the third elastic piece (13.2) is pushed to move away from the low-pressure oil cavity (5) to the third oil hole (13.2) so as to overcome the blocking piece (13.2).
2. The direct drive hydraulic pump according to claim 1, characterized in that: the first check ring (12.1) is also provided with a second sealing lip (12.5) which is clamped between the first sealing ring (12.2) and the high-pressure plunger pair (4) and can be pressed by the first sealing ring (12.2) to deform towards the high-pressure plunger pair (4).
3. The direct drive hydraulic pump according to claim 1, characterized in that: the high-pressure plunger pair (4) comprises a high-pressure plunger seat (4.1), a high-pressure plunger cavity (4.2) arranged in the high-pressure plunger seat (4.1), and a high-pressure plunger body (4.3) movably matched in the high-pressure plunger cavity (4.2), one end of the high-pressure plunger body (4.3) is abutted against the crankshaft (2), the other end of the high-pressure plunger body (4.3) is inserted into the high-pressure plunger cavity (4.2), and oil flows out from a second oil outlet (9) from a second oil inlet (8) into the high-pressure plunger cavity (4.2) through pressurization of the high-pressure plunger body (4.3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811194009.5A CN109185091B (en) | 2018-10-12 | 2018-10-12 | Direct-drive hydraulic pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811194009.5A CN109185091B (en) | 2018-10-12 | 2018-10-12 | Direct-drive hydraulic pump |
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| CN109185091A CN109185091A (en) | 2019-01-11 |
| CN109185091B true CN109185091B (en) | 2023-09-15 |
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| CN102619739A (en) * | 2012-04-09 | 2012-08-01 | 台州巨力工具有限公司 | Variable plunger pump |
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| DE102015120076A1 (en) * | 2014-12-05 | 2016-06-09 | Jongherya Co., Ltd. | Lubricant structure for the drive shaft of a fluid pressure increase pump |
| CN205937084U (en) * | 2016-07-30 | 2017-02-08 | 浙江亚太机电股份有限公司 | Seal structure of plunger pump of automobile anti -lock system |
| CN207131565U (en) * | 2017-09-12 | 2018-03-23 | 宁波富斯乐机械制造有限公司 | Efficient high-pressure power plunger pump |
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2018
- 2018-10-12 CN CN201811194009.5A patent/CN109185091B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619739A (en) * | 2012-04-09 | 2012-08-01 | 台州巨力工具有限公司 | Variable plunger pump |
| CN202612062U (en) * | 2012-04-09 | 2012-12-19 | 台州巨力工具有限公司 | Variable plunger piston pump |
| WO2013152549A1 (en) * | 2012-04-09 | 2013-10-17 | 台州巨力工具有限公司 | Variable plunger piston pump |
| DE102015120076A1 (en) * | 2014-12-05 | 2016-06-09 | Jongherya Co., Ltd. | Lubricant structure for the drive shaft of a fluid pressure increase pump |
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| CN109185091A (en) | 2019-01-11 |
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