Ultrahigh-pressure axial plunger pump

Abstract

The invention provides an ultrahigh-pressure axial plunger pump. The ultrahigh-pressure axial plunger pump comprises a pump shell, a gear pump assembly and a plunger pump assembly. The gear pump assembly is installed on the inner side of the lower portion of the pump shell, and the plunger pump assembly is installed on the inner side of the upper portion of the pump shell. The power input end of the gear pump assembly is used for being in transmission connection with an output shaft of the motor, and the power input end of the plunger pump assembly is in transmission connection with the power output end of the gear pump assembly. An oil inlet is formed in the bottom of the pump shell, an oil outlet is formed in the top of the pump shell, and a first flow guide channel and a second flow guide channel are further formed in the pump shell; the gear pump assembly and the plunger pump assembly are integrated in the pump shell at the same time, so that the pump body structure has the advantages of being small in size and occupied space, and the pump body structure only needs to be driven by a single motor, so that the pump body structure has the advantages of being compact in structure, low in cost and low in energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and in particular to an ultra-high pressure axial plunger pump. Background Art

[0002] The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. The gear part is generally composed of two gears, a pump body, and two closed spaces formed by the front and rear covers. When the gears rotate, the volume of the space on the gear disengagement side changes from small to large, forming a vacuum, sucking in the liquid, and the volume of the space on the gear meshing side changes from large to small, squeezing the liquid into the pipeline; the plunger pump relies on the reciprocating motion of the plunger in the cylinder body to change the volume of the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has high rated pressure and structure. It has the advantages of being compact, efficient and easy to adjust the flow rate. In actual use, in order to obtain a higher hydraulic oil pressure, it is often necessary to use the gear pump and the plunger pump in series to meet the use requirements. However, in the prior art, the gear pump and the plunger pump are two independent pump body structures. When the gear pump and the plunger pump are connected in series, an external pipeline is required to connect the gear pump and the plunger pump, which has the disadvantages of being large in size and occupying a large space. In addition, both the gear pump and the plunger pump require an independent power source to drive, which has the disadvantages of complex structure, high cost and high energy consumption. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an ultra-high-pressure axial piston pump, which integrates a gear pump assembly and a plunger pump assembly in a pump housing at the same time, thereby having the advantages of small size and small space occupation, and the pump body structure only needs to be driven by a single motor, thus having the advantages of compact structure, low cost and low energy consumption.

[0004] The present invention provides an ultra-high pressure axial piston pump, comprising a pump housing, a gear pump assembly and a plunger pump assembly; the gear pump assembly is mounted on the inner side of the lower part of the pump housing, and the plunger pump assembly is mounted on the inner side of the upper part of the pump housing; the power input end of the gear pump assembly is used for transmission connection with the output shaft of the motor, and the power input end of the plunger pump assembly is transmission connected with the power output end of the gear pump assembly; an oil inlet is arranged at the bottom of the pump housing, an oil outlet is arranged at the top of the pump housing, and a first guide channel and a second guide channel are also arranged inside the pump housing; when the gear pump assembly and the plunger pump assembly are working, the gear pump assembly absorbs hydraulic oil in the oil tank through the oil inlet and sends the hydraulic oil to the plunger pump assembly through the first guide channel, and the plunger pump assembly is used for pressurizing the hydraulic oil from the first guide channel and sending it to the oil outlet through the second guide channel.

[0005] By adopting the above structure, the present invention integrates the gear pump assembly and the plunger pump assembly in the pump housing at the same time, thereby having the advantages of small size and small space occupation, and the pump body structure only needs to be driven by a single motor, thus having the advantages of compact structure, low cost and low energy consumption; in addition, after adopting the structure in which the gear assembly and the plunger pump assembly are connected in series, since the gear pump assembly has a strong oil suction capacity, the gear pump assembly absorbs the hydraulic oil in the oil tank and supplies it to the plunger pump assembly, so that the oil suction process of the ultra-high pressure axial piston pump is smoother.

[0006] In a possible embodiment, the gear pump assembly includes a driving gear and a driven gear; the outer diameter of the driving gear is smaller than the outer diameter of the driven gear, an oil suction chamber is arranged on the inner side of the lower part of the pump housing, the driving gear and the driven gear are both rotatably connected in the oil suction chamber, the driving gear and the driven gear are meshed, an input shaft is coaxially arranged on the driving gear, the input shaft is used for transmission connection with the output shaft of the motor, an output shaft is coaxially arranged on the driven gear, the power input end of the plunger pump assembly is transmission connected with the output shaft, the oil inlet is arranged at the bottom of the oil suction chamber and is communicated with the oil inlet side of the oil suction chamber, and one end of the first guide channel is communicated with the oil outlet side of the oil suction chamber; after adopting this gear pump assembly, when the output shaft of the motor drives the input shaft to rotate, the input shaft can drive the driving gear to rotate, and since the driving gear is meshed with the driven gear, it can The driving gear drives the driven gear to rotate. When the driving gear and the driven gear rotate, the gear pump assembly composed of the driving gear and the driven gear can suck the hydraulic oil in the oil tank into the oil suction chamber through the oil inlet. Subsequently, the hydraulic oil entering the oil suction chamber can be sent to the plunger pump assembly through the first guide channel. In addition, since the outer diameter of the driving gear is smaller than the outer diameter of the driven gear, when the output shaft drives the plunger pump assembly, the driving gear and the driven gear can be used as a reduction gear set at the same time, that is, the purpose of speed reduction and torque increase can be achieved to improve the driving ability of the plunger pump assembly. That is, in the above technical solution, the gear pump assembly can not only play the role of pumping hydraulic oil, but also can be used as a reduction gear set, which has the advantage of multi-function. In addition, the motor used in the above is a high-speed DC motor.

[0007] In a possible embodiment, the plunger pump assembly includes a rotating seat and a valve core; the rotating seat is rotatably arranged inside the pump housing, the lower end of the rotating seat is drivingly connected to the output shaft, and the upper end surface of the rotating seat forms a slope surface; the valve core is fixed in the pump housing located above the rotating seat, and a plurality of sliding holes distributed at circumferential intervals are arranged on the inner side of the lower part of the valve core, each of which is vertically slidably connected to a plunger, and the lower end of each plunger abuts against the slope surface; the valve core located above each sliding hole is provided with an oil outlet hole connected to the sliding hole at the corresponding position, and each oil outlet hole has a plurality of sliding holes arranged on the inner side of the lower part of the valve core. Each of the oil inlet check valves is installed with an oil outlet check valve, and a guide groove connected to the slide hole at the corresponding position is arranged on the inner side of the upper end of each slide hole, and an oil inlet hole connected to the guide groove at the corresponding position is arranged in the valve core above each guide groove, and an oil inlet check valve is installed in each oil inlet hole; the other end of the first guide channel forms a first annular guide portion, and one end of the second guide channel forms a second annular guide portion, and the first annular guide portion and the second annular guide portion are coaxially arranged in the pump housing located above the valve core, and the upper end of each oil inlet hole is connected to the first annular guide portion, and each oil outlet The upper ends of the holes are connected to the second annular guide portion; by adopting this plunger pump assembly, when the rotating seat is driven to rotate by the output shaft, since the upper end surface of the rotating seat forms a slope surface, and the lower end of each plunger abuts against the slope surface, the rotating seat can push each plunger to move upward relative to the sliding hole in sequence and cycle. When the plunger moves upward, the plunger can push the hydraulic oil in the sliding hole and discharge the hydraulic oil into the second annular guide portion through the oil outlet one-way valve, and the hydraulic oil can finally be discharged through the second guide channel and the oil outlet (the plunger pump assembly can The hydraulic oil of the gear pump assembly is pressurized); in the above process, when the lower end of the plunger moves from the lowest point of the slope surface to the highest point of the slope surface, the plunger can move upward, and when the lower end of the plunger moves from the highest point of the slope surface to the lowest point of the slope surface, the hydraulic oil from the gear pump assembly can enter the sliding hole through the oil inlet check valve, and the hydraulic oil can fill the corresponding sliding hole and push the corresponding plunger to move downward and reset; through the continuous rotation of the rotating seat, the hydraulic oil pressurized by the plunger pump assembly can be continuously discharged through the second guide channel and the oil outlet.

[0008] In a possible embodiment, a slot is provided at the lower end of the rotating seat, a connecting pin is transversely provided inside the slot, both ends of the connecting pin are plugged into the rotating seat, the upper end of the output shaft is inserted into the slot, and a pair of embedding grooves are provided at the upper end of the output shaft, and the pair of embedding grooves are engaged with the connecting pin to enable the rotating seat to be transmission-connected with the output shaft; by adopting this structure, after the upper end of the output shaft is inserted into the slot, the pair of embedding grooves can be engaged with the connecting pin, thereby realizing the transmission connection between the rotating seat and the output shaft, that is, the output shaft can reliably drive the rotating seat to rotate synchronously; in addition, by adopting this structure, the advantage of convenient transmission connection between the rotating seat and the output shaft is achieved.

[0009] In a possible embodiment, an overflow valve group is also installed inside the pump housing; a reflux hole is provided on the pump housing below the overflow valve group, the outflow end of the overflow valve group is connected to the reflux hole, and the inlet end of the overflow valve group is connected to the first guide channel; through the setting of the overflow valve group, since the hydraulic oil output of the gear pump assembly is large, the excess hydraulic oil that does not have time to enter the plunger pump assembly can flow back to the oil tank through the first guide channel, the overflow valve group and the reflux hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0011] Figure 2 It is a schematic diagram of a partially exploded three-dimensional structure of the first embodiment of the present invention;

[0012] Figure 3 It is a schematic diagram of a second partially exploded three-dimensional structure of the present invention;

[0013] Figure 4 It is a three-dimensional cross-sectional structural schematic diagram of the present invention;

[0014] Figure 5 It is a cross-sectional structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0015] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0016] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0017] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0018] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] See also Figure 1-5 As shown, the embodiment of the present application discloses an ultra-high pressure axial piston pump, comprising a pump housing 1, a gear pump assembly and a plunger pump assembly; the gear pump assembly is installed on the inner side of the lower part of the pump housing 1, and the plunger pump assembly is installed on the inner side of the upper part of the pump housing 1; the power input end of the gear pump assembly is used for transmission connection with the output shaft of the motor, and the power input end of the plunger pump assembly is transmission connected with the power output end of the gear pump assembly; an oil inlet 11 is provided at the bottom of the pump housing 1, an oil outlet 12 is provided at the top of the pump housing 1, and a first guide channel 13 and a second guide channel 14 are also provided inside the pump housing 1; when the gear pump assembly and the plunger pump assembly are working, the gear pump assembly absorbs the hydraulic oil in the oil tank through the oil inlet 11 and sends the hydraulic oil to the plunger pump assembly through the first guide channel 13, and the plunger pump assembly is used to pressurize the hydraulic oil from the first guide channel 13 and send it to the oil outlet 12 through the second guide channel 14.

[0020] When the present invention is in use, the ultra-high pressure axial piston pump is installed in the hydraulic oil tank, and the ultra-high pressure axial piston pump is immersed in the hydraulic oil. When the motor drives the gear pump assembly and the plunger pump assembly to work, the gear pump assembly can absorb the hydraulic oil in the oil tank through the oil inlet and send the hydraulic oil to the plunger pump assembly through the first guide channel. The plunger pump assembly can pressurize the hydraulic oil from the first guide channel and send it to the oil outlet through the second guide channel, thereby realizing the pressurization of the hydraulic oil.

[0021] The gear pump assembly includes a driving gear 21 and a driven gear 22; the outer diameter of the driving gear 21 is smaller than the outer diameter of the driven gear 22, an oil suction chamber 15 is arranged on the inner side of the lower part of the pump housing 1, the driving gear 21 and the driven gear 22 are both rotatably connected in the oil suction chamber 15, the driving gear 21 and the driven gear 22 are meshed, an input shaft 211 is coaxially arranged on the driving gear 21, the input shaft 211 is used for driving connection with the output shaft of the motor, an output shaft 221 is coaxially arranged on the driven gear 22, the power input end of the plunger pump assembly is drivingly connected with the output shaft 221, the oil inlet 11 is arranged at the bottom of the oil suction chamber 15 and is communicated with the oil inlet side of the oil suction chamber 15, and one end of the first guide channel 13 is communicated with the oil outlet side of the oil suction chamber 15; after adopting this gear pump assembly, when the output shaft of the motor drives the input shaft to rotate, the input shaft can drive the driving gear to rotate, Since the driving gear is meshed with the driven gear, the driving gear can drive the driven gear to rotate. When the driving gear and the driven gear rotate, the gear pump assembly composed of the driving gear and the driven gear can suck the hydraulic oil in the oil tank into the oil suction chamber through the oil inlet. Subsequently, the hydraulic oil entering the oil suction chamber can be sent to the plunger pump assembly through the first guide channel; in addition, since the outer diameter of the driving gear is smaller than the outer diameter of the driven gear, when the output shaft drives the plunger pump assembly, the driving gear and the driven gear can be used as a reduction gear set at the same time, that is, the purpose of speed reduction and torque increase can be achieved to improve the driving ability of the plunger pump assembly. That is, in the above technical solution, the gear pump assembly can not only play the role of pumping hydraulic oil, but also can be used as a reduction gear set, which has the advantage of multi-function. In addition, the motor used in the above is a high-speed DC motor.

[0022] The plunger pump assembly includes a rotating seat 31 and a valve core 32; the rotating seat 31 is rotatably arranged inside the pump housing 1, the lower end of the rotating seat 31 is transmission-connected to the output shaft 221, and the upper end surface of the rotating seat 31 forms a slope surface 311; the valve core 32 is fixed in the pump housing 1 located above the rotating seat 31, and a plurality of sliding holes 321 distributed at circumferential intervals are arranged on the inner side of the lower part of the valve core 32, each of the sliding holes 321 is vertically slidably connected with a plunger 33, and the lower end of each plunger 33 abuts against the slope surface 311; the valve core 32 located above each sliding hole 321 is provided with an oil outlet connected to the sliding hole 321 at the corresponding position The oil outlet hole 322 is provided with an oil outlet one-way valve 34 in each oil outlet hole 322, and a guide groove 323 communicating with the slide hole 321 at the corresponding position is provided on the inner side of the upper end of each slide hole 321, and an oil inlet hole 324 communicating with the guide groove 323 at the corresponding position is provided in the valve core 32 located above each guide groove 323, and an oil inlet one-way valve 35 is installed in each oil inlet hole 324; the other end of the first guide channel 13 forms a first annular guide portion 131, and one end of the second guide channel 14 forms a second annular guide portion 141, and the first annular guide portion 131 and the second annular guide portion 141 are coaxially arranged at the valve core 32 located above each guide groove 323. In the pump housing 1 above the core 32, the upper end of each oil inlet hole 324 is connected to the first annular guide portion 131, and the upper end of each oil outlet hole 322 is connected to the second annular guide portion 141; by adopting this plunger pump assembly, when the rotating seat is driven to rotate by the output shaft, since the upper end surface of the rotating seat forms a slope surface, and the lower end of each plunger abuts on the slope surface, the rotating seat can push each plunger to move upward relative to the sliding hole in sequence and cycle. When the plunger moves upward, the plunger can push the hydraulic oil in the sliding hole and discharge the hydraulic oil into the second annular guide portion through the oil outlet one-way valve, and the hydraulic oil can finally Discharged through the second guide channel and the oil outlet (the plunger pump assembly can pressurize the hydraulic oil from the gear pump assembly); in the above process, when the lower end of the plunger moves from the lowest point of the slope surface to the highest point of the slope surface, the plunger can move upward, and when the lower end of the plunger moves from the highest point of the slope surface to the lowest point of the slope surface, the hydraulic oil from the gear pump assembly can enter the sliding hole through the oil inlet check valve, and the hydraulic oil can fill the corresponding sliding hole and push the corresponding plunger to move downward and reset; through the continuous rotation of the rotating seat, the hydraulic oil pressurized by the plunger pump assembly can be continuously discharged through the second guide channel and the oil outlet.

[0023] A slot 312 is provided at the lower end of the rotating seat 31, and a connecting pin 313 is transversely provided inside the slot 312. Both ends of the connecting pin 313 are plugged with the rotating seat 31. The upper end of the output shaft 221 is inserted into the slot 312. A pair of embedding grooves 222 are provided at the upper end of the output shaft 221. The pair of embedding grooves 222 are embedded with the connecting pin 313 to achieve transmission connection between the rotating seat 31 and the output shaft 221. By adopting this structure, after the upper end of the output shaft is inserted into the slot, the pair of embedding grooves can be embedded with the connecting pin, thereby realizing the transmission connection between the rotating seat and the output shaft, that is, the output shaft can reliably drive the rotating seat to rotate synchronously. In addition, by adopting this structure, the rotating seat and the output shaft have the advantage of convenient transmission connection.

[0024] An overflow valve group 4 is also installed inside the pump housing 1; a reflux hole 16 is provided on the pump housing 1 below the overflow valve group 4, the outflow end of the overflow valve group 4 is connected to the reflux hole 16, and the inflow end of the overflow valve group 4 is connected to the first guide channel 13; through the setting of the overflow valve group, since the hydraulic oil output of the gear pump assembly is large, the excess hydraulic oil that does not have time to enter the plunger pump assembly can flow back to the oil tank through the first guide channel, the overflow valve group and the reflux hole.

[0025] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An ultra-high pressure axial piston pump, characterized in that: The invention comprises a pump housing (1), a gear pump assembly and a plunger pump assembly; the gear pump assembly is mounted on the inner side of the lower part of the pump housing (1), and the plunger pump assembly is mounted on the inner side of the upper part of the pump housing (1); the power input end of the gear pump assembly is used for transmission connection with the output shaft of the motor, and the power input end of the plunger pump assembly is used for transmission connection with the power output end of the gear pump assembly; the bottom of the pump housing (1) is provided with an oil inlet (11), the top of the pump housing (1) is provided with an oil outlet (12), and the interior of the pump housing (1) is also provided with a first guide channel (13) and a second guide channel (14); when the gear pump assembly and the plunger pump assembly are working, the gear pump assembly absorbs hydraulic oil from the oil tank through the oil inlet (11) and delivers the hydraulic oil to the plunger pump assembly through the first guide channel (13), and the plunger pump assembly is used for pressurizing the hydraulic oil from the first guide channel (13) and delivering it to the oil outlet (12) through the second guide channel (14).

2. The ultra-high pressure axial piston pump according to claim 1, characterized in that: The gear pump assembly comprises a driving gear (21) and a driven gear (22); the outer diameter of the driving gear (21) is smaller than the outer diameter of the driven gear (22); an oil suction chamber (15) is arranged on the inner side of the lower part of the pump housing (1); the driving gear (21) and the driven gear (22) are both rotatably connected in the oil suction chamber (15); the driving gear (21) and the driven gear (22) are meshed; an input shaft (211) is coaxially arranged on the driving gear (21); the input shaft (211) is used for transmission connection with the output shaft of the motor; an output shaft (221) is coaxially arranged on the driven gear (22); a power input end of the plunger pump assembly is transmission connected with the output shaft (221); the oil inlet (11) is arranged at the bottom of the oil suction chamber (15) and is communicated with the oil inlet side of the oil suction chamber (15); one end of the first guide channel (13) is communicated with the oil outlet side of the oil suction chamber (15).

3. The ultra-high pressure axial piston pump according to claim 2, characterized in that: The plunger pump assembly comprises a rotating seat (31) and a valve core (32); the rotating seat (31) is rotatably arranged inside the pump housing (1); the lower end of the rotating seat (31) is drivingly connected to the output shaft (221); the upper end surface of the rotating seat (31) forms a slope surface (311); the valve core (32) is fixed in the pump housing (1) above the rotating seat (31); a plurality of valve cores (32) are arranged on the inner side of the lower part of the valve core (32) The sliding holes (321) are distributed at intervals in the circumferential direction, each of the sliding holes (321) is vertically slidably connected with a plunger (33), and the lower end of each plunger (33) abuts against the slope surface (311); the valve core (32) located above each of the sliding holes (321) is provided with an oil outlet hole (322) connected with the sliding hole (321) at the corresponding position, and each of the oil outlet holes (322) is installed with an oil outlet check valve (34), and each The inner side of the upper end of the sliding hole (321) is provided with a guide groove (323) which is in communication with the sliding hole (321) at a corresponding position; the valve core (32) located above each of the guide grooves (323) is provided with an oil inlet hole (324) which is in communication with the guide groove (323) at a corresponding position; and each of the oil inlet holes (324) is installed with an oil inlet check valve (35); the other end of the first guide channel (13) forms a first annular guide portion ( 131), one end of the second guide channel (14) forms a second annular guide portion (141), the first annular guide portion (131) and the second annular guide portion (141) are coaxially arranged in the pump housing (1) above the valve core (32), the upper end of each of the oil inlet holes (324) is communicated with the first annular guide portion (131), and the upper end of each of the oil outlet holes (322) is communicated with the second annular guide portion (141).

4. The ultra-high pressure axial piston pump according to claim 3, characterized in that: The lower end of the rotating seat (31) is provided with a slot (312), and a connecting pin (313) is transversely arranged inside the slot (312). Both ends of the connecting pin (313) are plugged into the rotating seat (31). The upper end of the output shaft (221) is inserted into the slot (312). The upper end of the output shaft (221) is provided with a pair of embedded grooves (222), and the pair of embedded grooves (222) are embedded with the connecting pin (313) to achieve transmission connection between the rotating seat (31) and the output shaft (221).

5. The ultra-high pressure axial piston pump according to any one of claims 1 to 4, characterized in that: A relief valve group (4) is also installed inside the pump housing (1); a return hole (16) is provided on the pump housing (1) below the relief valve group (4); an outflow end of the relief valve group (4) is connected to the return hole (16), and an inflow end of the relief valve group (4) is connected to the first guide channel (13).

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