Plunger pump and plunger pump assembly

Abstract

At least one embodiment of the utility model provides a plunger pump and a plunger pump assembly comprising the same. The plunger pump includes: a rotating shaft; a first gear non-rotatably coaxially fixed to the rotating shaft to receive rotational power from the rotating shaft; an impeller provided in a suction flow path for a pressure medium of the plunger pump; a second gear engaged with the first gear and connected to the impeller; and a third gear engaged with the first gear for extracting the power of the rotating shaft to the outside of the plunger pump. The rotation axis of at least one of the second gear and the third gear is not parallel to the rotation axis of the first gear. The plunger pump allows an impeller and a third gear which is at least a part of a power takeoff to be arranged in the plunger pump at the same time, and the orientation of the impeller and the power takeoff can be conveniently adjusted.

Description

Technical Field

[0001] The present disclosure relates to a plunger pump and a plunger pump assembly. Background Art

[0002] A plunger pump is a crucial component of a hydraulic system. It typically consists of a rotating shaft, a swash plate, a cylinder block with multiple plunger holes arranged circumferentially around the axis of rotation, and multiple plungers, each mounted in one of the multiple plunger holes. The swash plate includes a working surface inclined relative to the axis of rotation. The ends of the multiple plungers, each extending from a plunger hole, engage with the working surface via a sliding shoe. As the cylinder block rotates with the shaft, the plungers translate longitudinally within the plunger holes, transferring pressure medium. Adjusting the swash plate's inclination adjusts the plunger stroke.

[0003] The plunger pump can be provided with an impeller, which is arranged in the suction flow path of the pressure medium to increase the pressure of the pressure medium entering the cylinder of the plunger pump, so as to further improve the oil suction performance of the plunger pump, thereby increasing the operating speed of the plunger pump and greatly reducing the risk of cavitation.

[0004] The impeller in the prior art is usually directly fixedly connected to the drive shaft so as to rotate coaxially with the drive shaft at the same speed. Therefore, the speed of the impeller cannot be adjusted, making it difficult to adjust the supercharging effect of the impeller.

[0005] In addition, the plunger pump can also be provided with an external power device (i.e., a power take-off) for extracting driving force from the plunger pump to drive the operation of other external devices (e.g., an auxiliary pump). There are two common structures of existing external power devices: the first is that a portion of the external power device is directly coaxially connected to the drive shaft, so that the external device and the plunger pump (e.g., as a main pump) operate at the same speed; the second is that a portion of the external power device is driven by a spur gear to extract driving force from the drive shaft of the plunger pump. Whether it is the first or the second structure, it is often only possible to allow the external device and the plunger pump to operate at the same speed, but the design speed of the auxiliary pump is generally higher than that of the main pump, so the auxiliary pump cannot perform at its best performance, which will result in low efficiency of the auxiliary pump and increased engine fuel consumption.

[0006] In addition, the structure of the existing plunger pump cannot take into account both the impeller and the external power device at the same time. Utility Model Content

[0007] At least one embodiment of the present disclosure provides a plunger pump comprising: a rotating shaft; a first gear non-rotatably coaxially fixed to the rotating shaft to receive rotational power from the rotating shaft; an impeller disposed in a suction flow path for a pressure medium of the plunger pump; a second gear meshing with the first gear and connected to the impeller; and a third gear meshing with the first gear to extract power from the rotating shaft to the outside of the plunger pump. The rotation axis of at least one of the second gear and the third gear is non-parallel to the rotation axis of the first gear.

[0008] For example, in some embodiments, the rotational axis of the second gear is at an angle of approximately 90 degrees to the rotational axis of the first gear, and the rotational axis of the third gear is at an angle of approximately 90 degrees to the rotational axis of the first gear.

[0009] For example, in some embodiments, the first gear, the second gear, and the third gear are bevel gears.

[0010] For example, in some embodiments, the first gear, the second gear, and the third gear are helical bevel gears, and each transmission tooth of each of the first gear, the second gear, and the third gear extends obliquely in an arc shape in the radial direction.

[0011] For example, in some embodiments, the plunger pump further includes: a fourth gear meshing with the first gear for extracting power from the rotating shaft to an exterior of the plunger pump. The included angle between the rotation axis of the fourth gear and the rotation axis of the first gear is approximately 90 degrees, and the rotation axis of the fourth gear is parallel to the rotation axis of the third gear.

[0012] For example, in some embodiments, the plunger pump further includes: a first output coupling that is non-rotatably coaxially fixed to the third gear; and a second output coupling that is non-rotatably coaxially fixed to the fourth gear.

[0013] For example, in some embodiments, the second gear is non-rotatably fixed coaxially to the impeller.

[0014] For example, in some embodiments, the impeller has a disk-shaped body and a circumferential wall surrounding the disk-shaped body and protruding from the disk-shaped body in the axial direction of the impeller. The impeller covers a portion of a housing of the plunger pump provided with a suction port for sucking pressure medium, such that the circumferential wall surrounds the suction port.

[0015] For example, in some embodiments, the circumferential wall has an end annular segment away from the disc-shaped body, and the side surface of the end annular segment slides with the side surface of the corresponding circular closed structure of the housing of the plunger pump to support and position the impeller, and the corresponding circular closed structure surrounds the suction port.

[0016] At least one embodiment of the present disclosure provides a plunger pump assembly comprising: the plunger pump described above; and a second plunger pump having a second rotating shaft non-rotatably coaxially fixed to the rotating shaft of the plunger pump via a coupling. A first gear is non-rotatably coaxially fixed to the coupling. The plunger pump and the second plunger pump share a common suction flow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A longitudinal cross-sectional view of a plunger pump is shown;

[0019] Figure 2 A longitudinal cross-sectional view of another plunger pump is shown;

[0020] Figure 3 A longitudinal sectional view of yet another plunger pump is shown;

[0021] Figure 4 shows a cross-sectional side view of a plunger pump assembly according to an embodiment of the present disclosure;

[0022] Figure 5 and Figure 6 Shown respectively Figure 4 A cross-sectional view of a plunger pump assembly, wherein Figure 5 exist Figure 4 Intercepted at line AA in Figure 6 exist Figure 4 Intercepted at line BB in the figure;

[0023] Figure 7 and Figure 8 Shown respectively Figure 4 A three-dimensional diagram of the coupling, the first bevel gear, the second bevel gear, the third bevel gear, the fourth bevel gear and the impeller;

[0024] Figure 9A and Figure 9B shows an example of a bevel gear configuration according to an embodiment of the present disclosure;

[0025] Figure 10A and Figure 10B Another example of a bevel gear configuration according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0026] Below, with reference to the accompanying drawings, a plunger pump and plunger pump assembly according to an embodiment of the present disclosure will be described in detail. To make the purpose, technical solutions, and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments.

[0027] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the present disclosure as claimed, but merely represents selected embodiments of the present disclosure. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort are within the scope of protection of the present disclosure.

[0028] Unless the context otherwise defines, the singular includes the plural. Throughout the specification, the terms "including", "having", etc. are used herein to specify the presence of the features, numbers, steps, operations, elements, parts or their combination, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or their combination.

[0029] In addition, even if ordinal terms such as “first”, “second”, etc. are used to describe various components, these components are not limited by these terms, and these terms are only used to distinguish one element from other elements.

[0030] In addition, in the description of the present invention, it should be understood that in the following description and the appended claims, the terms "longitudinal", "axial" or "axial" refer to the extension direction of the longest dimension of the modified feature, "radial" refers to the direction perpendicular to the axial or axial direction, "circumferential" refers to the direction around the axial or axial direction, and "cross-section" refers to a plane perpendicular to the "longitudinal", "axial" or "axial direction".

[0031] For ease of understanding, first refer to Figure 1-Figure 3 A prior art plunger pump is described. Figure 1As shown, a plunger pump generally includes a rotating shaft 11, a swash plate 12, a port plate 13, a cylinder body 14 having a plurality of plunger holes arranged circumferentially around the rotation axis, and a plurality of plungers 15, each of which is mounted in one of the plurality of plunger holes to form a pressure chamber 151. The rotating shaft 11 and the cylinder body 14 are non-rotatably fixed to each other and are rotatably supported together in a housing 16. The swash plate 12 includes a working surface inclined relative to the rotation axis, and one end of the plurality of plungers 15, which extend out of the plunger holes, engages with the working surface via a slipper 152 in a known manner. The port plate 13 is provided with a low-pressure inlet 131 and a high-pressure outlet 132. When the cylinder body 14 rotates with the rotating shaft 11, the plungers 15 translate longitudinally in the corresponding plunger holes, drawing pressure medium from the suction port 161 into the low-pressure inlet 131 through the suction flow path and discharging the high-pressure pressure medium from the high-pressure outlet 132 toward the discharge port 162 through the discharge flow path. The suction port 161 is connected to the oil tank through a pipeline, and the cavity at the suction port 161 is filled with pressure medium. The plunger pump also includes an impeller 17. The impeller 17 is coaxially fixed to the rotating shaft 11 and is provided at the suction port 161. The impeller 17 generally includes a disc-shaped body and a pressurization path provided on the disc-shaped body for allowing the pressure medium to flow through. When the plunger pump is working, the impeller 17 rotates together with the rotating shaft 11, and the pressure medium flowing into the plunger pump from the suction port 161 of the plunger pump is pressurized via the pressurization path and enters the low-pressure inlet 131, and then flows into the pressure chamber 151 of the plunger hole. Therefore, the impeller 17 increases the initial pressure of the pressure medium flowing into the pressure chamber 151, which is beneficial to increasing the efficiency of the plunger pump. However, since the impeller 17 is coaxially fixed directly to the rotating shaft 11 and has the same rotation speed as the rotating shaft 11, it is difficult to adjust the rotation speed of the impeller 17, and thus the pressurization effect of the impeller 17 cannot be adjusted as needed.

[0032] Two plunger pumps can form a plunger pump assembly. Figure 2 As shown, the plunger pump assembly may include a first plunger pump 2 having a first rotating shaft 211 and a second plunger pump 2' having a second rotating shaft 212. The first plunger pump 2 and the second plunger pump 2' may have Figure 1 The plunger pumps shown are configured with a swash plate, a distribution plate, a cylinder body and a plunger that are basically identical. The input end 2111 of the first rotating shaft 211 of the first plunger pump 2 is connected to a drive source, and the connection end 2112 of the first rotating shaft 211 of the first plunger pump 2, which is opposite to the input end, is connected to the input end of the second rotating shaft 212 of the second plunger pump 2' via a coupling 28. The first plunger pump 2 and the second plunger pump 2' have the same suction port 261 and discharge port (not shown). The impeller 27 is non-rotatably fixed to the coupling 28 and is arranged in a common suction flow path of the first plunger pump 2 and the second plunger pump 2', thereby increasing the initial pressure of the pressure medium entering the first plunger pump 2 and the second plunger pump 2'.

[0033] like Figure 3 As shown, the plunger pump assembly includes a first plunger pump 3 and a second plunger pump 3'. The first plunger pump 3 and the second plunger pump 3' respectively have Figure 2 The first plunger pump 2 and the second plunger pump 2' are basically configured with the same rotating shaft, swash plate, valve plate, cylinder body and plunger. Figure 2 The difference from the illustrated plunger pump assembly is that a power take-off 39 is mounted to a coupling 38 connecting a first rotating shaft 311 and a second rotating shaft 312. A first spur gear 381 is fixed to the coupling 38. A second spur gear 391 of the power take-off 39 meshes with the first spur gear 381 to transmit power to an external device.

[0034] like Figure 2 and Figure 3 As shown, it is difficult to install the power take-off and the impeller on the plunger pump at the same time.

[0035] Figure 4 1 shows a cross-sectional side view of a plunger pump assembly according to one embodiment of the present disclosure. Figure 4 As shown, the plunger pump assembly includes a first plunger pump 4 having a first rotating shaft 411 and a second plunger pump 4' having a second rotating shaft 412, which are accommodated in a common housing of the plunger pump assembly. The first plunger pump 4 and the second plunger pump 4' have the same suction port 461 and discharge port 462. The first plunger pump 4 and the second plunger pump 4' are known and can be used with Figure 1-Figure 3 The plunger pumps shown have the same and similar arrangements (swash plate, valve plate, cylinder block and plunger, etc.), which will not be repeated here. The input end 4111 of the first rotating shaft 411 of the first plunger pump 4 is connected to the drive source, and the connection end 4112 of the first rotating shaft 411 of the first plunger pump 4, which is opposite to the input end, is connected to the input end of the second rotating shaft 412 of the second plunger pump 4' via a coupling 481. Therefore, the first rotating shaft 411 and the second rotating shaft 412 are fixed to each other non-rotatably and rotate coaxially at the same speed.

[0036] Figure 5 and Figure 6 Shown respectively Figure 4 A cross-sectional view of a plunger pump assembly, wherein Figure 5 exist Figure 4 Intercepted at line AA in Figure 6 exist Figure 4 Intercepted at line BB in. Figure 4-6As shown, the plunger pump assembly includes a first bevel gear 482, a second bevel gear 472, a third bevel gear 491 and a fourth bevel gear 492. The cooperation of these bevel gears allows the impeller 471 and the power take-off to be installed in the plunger pump assembly at the same time. Since the impeller 471 and the power take-off can be installed in the plunger pump assembly at the same time, multiple configurations can be optionally used in the same model of plunger pump assembly (or plunger pump). The user can optionally adopt a configuration of a plunger pump assembly with only a power take-off, only an impeller, or both a power take-off and an impeller in the same model of plunger pump assembly to suit their application needs. Therefore, the scope of application of the plunger pump assembly is expanded and its manufacturing and use costs are reduced.

[0037] like Figure 4 As shown, the first bevel gear 482 is non-rotatably connected to the coupling 481 via a spline. The second bevel gear 472 meshes with the first bevel gear 482 and is non-rotatably fixed to the impeller 471. For example, the second bevel gear 472 is secured to the impeller 471 via a hexagon socket screw 473 passing through it or by an interference fit. The first bevel gear 482 has a larger number of teeth than the second bevel gear 472. Therefore, by adjusting the gear ratio between the first bevel gear 482 and the second bevel gear 472, the speed of the impeller 471 can be adjusted and increased to meet the boost requirements. The speed of the impeller 471 can also be reduced. The pitch circle diameter of the first bevel gear 482 can be larger than the pitch circle diameter of the second bevel gear 472 to ensure that both the first bevel gear 482 and the second bevel gear 472 have reliable strength. The impeller 471 is mounted within the housing, which is provided with an intake port 461 that is directly connected to the impeller 471. As impeller 471 rotates at high speed driven by rotating shafts 411, 412, the medium entering through suction port 461 is agitated and ejected from impeller outlet 4717. The pressurized medium ejected from impeller 471 enters low-pressure inlets 431, 431' of the port plates of the two plunger pumps 4, 4', achieving the oil suction and pressurization process.

[0038] In addition, if Figure 5 and Figure 6As shown, the third bevel gear 491 and the fourth bevel gear 492 are respectively engaged with the first bevel gear 482, and the third bevel gear 491 and the fourth bevel gear 492 are respectively fixed to the first output coupling 493 and the second output coupling 494, thereby extracting the driving force (i.e., torque) of the rotating shaft to the outside of the plunger pump. For example, the input shaft of an external device such as an auxiliary pump can be directly connected to the first output coupling 493 or the second output coupling 494 to obtain the driving force of the plunger pump assembly. For example, the number of teeth of the third bevel gear 491 and / or the fourth bevel gear 492 can be less than the number of teeth of the first bevel gear 482, so that the rotation speed of the corresponding third bevel gear 491 and / or the fourth bevel gear 492 is higher than the rotation speed of the rotating shafts 411 and 412. In a hydraulic system, the external device is generally a small-displacement plunger pump, and the rated speed of a small-displacement plunger pump is generally higher than that of the main plunger pump assembly. By changing the gear ratio of the third bevel gear 491 and / or the fourth bevel gear 492 to the first bevel gear 482 , the operating speed of the external device can be adjusted, thereby allowing the small-displacement plunger pump to operate at the most efficient rated operating condition.

[0039] Figure 7 and Figure 8 Shown respectively Figure 4 481, the first bevel gear 482, the second bevel gear 472, the third bevel gear 491, the fourth bevel gear 492 and the impeller 471. Figure 5-Figure 8 As shown, due to the provision of first bevel gear 482 and second bevel gear 472, the orientation of impeller 471 relative to the rotation axis can be adjusted to position impeller 471 in a suitable location. The rotation axis of second bevel gear 472 is non-parallel to the rotation axis of first bevel gear 482 (i.e., within a range of greater than 0 degrees and less than or equal to 90 degrees). Preferably, this angle is in the range of 45 degrees to 90 degrees, and more preferably 90 degrees. Furthermore, due to the provision of first bevel gear 482 and third bevel gear 491 and / or fourth bevel gear 492, the orientation of first output coupling 493 and second output coupling 494 for external devices relative to the rotation axis can be adjusted to position the external device in a suitable location. The angle between the rotation axis of third bevel gear 491 and / or fourth bevel gear 492 and the rotation axis of first bevel gear 482 can be 0 degrees (i.e., parallel to each other) or in the range of 45 degrees to 90 degrees, and preferably 90 degrees. Therefore, the cooperation of the first bevel gear 482 , the second bevel gear 472 , the third bevel gear 491 , and the fourth bevel gear 492 can allow the respective components to be arranged more compactly in the housing of the plunger pump assembly.

[0040] like Figure 4-Figure 8As shown, impeller 471 has a disc-shaped body 4711 and a circumferential wall 4712 that surrounds disc-shaped body 4711 and protrudes from disc-shaped body 4711 in the axial direction of impeller 471. Impeller 471 covers the portion of the plunger pump housing where suction port 461 is provided, like a lid, and circumferential wall 4712 is provided around suction port 461. Therefore, impeller 471 can effectively handle the pressure medium flowing into the plunger pump from suction port 461. Circumferential wall 4712 has a body section 4715 proximal to disc-shaped body 4711 and an end ring section 4713 distal to disc-shaped body 4711. An impeller inlet 4716 is provided at one end distal to disc-shaped body 4711, and an impeller outlet 4717 is provided on the circumferential side of body section 4715. End ring section 4713 is recessed radially inward relative to body section 4715 to form a shoulder 4714. The end ring section 4713 can be inserted into a circular groove 463 arranged around the suction port 461 of the plunger pump (see Figure 5 ) so that the outer surface of the end annular segment 4713 slides with the annular inner sidewall of the circular groove 463. Therefore, the impeller 471 and the second bevel gear 472 can be supported on one side by the first bevel gear 482 through the meshing of the first bevel gear 482 and the second bevel gear 472, and on the other side can be supported by the housing through the end annular segment 4713. The supporting components for the impeller 471 and the second bevel gear 472 in the housing can be reduced or omitted, saving space in the housing and reducing costs. In addition, the shoulder 4714 can axially abut the portion of the housing surrounding the circular groove 463 on the radial outside to axially position and support the impeller 471. However, the impeller 471 and the corresponding housing structure that cooperates with the impeller 471 can have other configurations. For example, the shoulder 4714 can be omitted. For example, the housing may be provided with a circular or annular protrusion, and the end annular segment 4713 of the impeller 471 may be disposed radially outwardly around the circular or annular protrusion, such that the inner surface of the end annular segment 4713 of the impeller 471 slides with the outer surface of the circular or annular protrusion. The present disclosure is not limited thereto. Here, the circular or annular protrusion and the circular groove may be collectively referred to as a circular closed structure, which surrounds the suction port 461.

[0041] As described above, the plunger pump assembly according to the present disclosure can meet various application needs. For example, when it is necessary to transmit the power of the plunger pump assembly to two external devices and an impeller needs to be provided to increase the initial pressure of the plunger pump assembly, the third bevel gear 491 and the fourth bevel gear 492 can be installed, and the two external devices are connected to the third bevel gear 491 and the fourth bevel gear 492 respectively, and the second bevel gear 472 with the impeller 471 fixed thereto can also be installed. In addition, the rotation speed of the impeller 471 can be adjusted by selecting the number of teeth of the second bevel gear 472, and the input speed of the external device can be adjusted by selecting the number of teeth of the third bevel gear 491 and the fourth bevel gear 492 respectively. For example, when it is only necessary to transmit the power of the plunger pump assembly to one external device, the external device can be connected to one of the third bevel gear 491 and the fourth bevel gear 492, without installing the other of the third bevel gear 491 and the fourth bevel gear 492 and the second bevel gear 472 and / or the impeller 471.

[0042] Plunger pumps are usually available in two models: left-handed (clockwise rotation when viewed from the input end of the rotating shaft) and right-handed (counterclockwise rotation when viewed from the input end of the rotating shaft). In an embodiment according to the present disclosure, when the rotation direction of the plunger pump assembly changes, the change can be accommodated by changing the installation direction of the first bevel gear 482 without changing the rotation direction of the second bevel gear 472, the third bevel gear 491 and the fourth bevel gear 492. Therefore, when the rotation direction of the rotating shafts 411 and 412 of the plunger pump assembly changes, the rotation direction of the impeller 471 connected to the second bevel gear 472 will not change accordingly, and the rotation direction of the input shaft connected to the third bevel gear 491 and the fourth bevel gear 492 will not change accordingly. For example, when the plunger pump assembly is left-handed, the first bevel gear 482 can be installed to the side of the coupling 481 close to the first rotating shaft 411, and its conical apex faces the other side (such as Figure 4 (as shown); when the plunger pump assembly rotates right, the first bevel gear 482 can be mounted on the side of the coupling 481 closest to the second rotating shaft 412, with its conical apex facing the other side. This significantly improves usability. For example, the impeller 471 can be manufactured with blades having a single spiral orientation. This also allows for greater flexibility in the arrangement of external devices.

[0043] Figure 9A and Figure 9B : shows an example of a bevel gear configuration according to an embodiment of the present disclosure. For example, the first bevel gear 482, the second bevel gear 472, the third bevel gear 491 and the fourth bevel gear 492 described above can adopt this configuration. Figure 9A and Figure 9BAs shown, in this example, the bevel gear is a straight bevel gear, and its transmission teeth 51 extend in a straight line in the radial direction, and the extension line of the tooth surface of each transmission tooth 51 intersects the rotation axis. The advantage of this gear is that it is easy to process and can save a lot of costs.

[0044] Figure 10A and Figure 10B 1 shows another example of a bevel gear configuration according to an embodiment of the present disclosure. For example, the first bevel gear 482, the second bevel gear 472, the third bevel gear 491 and the fourth bevel gear 492 described above may also adopt this configuration. Figure 10A and Figure 10B As shown, in this example, the bevel gear is a helical bevel gear, and its transmission teeth 51 extend obliquely in an arc in the radial direction. Gears of this structure can form a larger overlap and provide less noise during transmission, which is very important in the field of plunger pumps. In addition, it can withstand larger torques and loads, and has obvious advantages in heavy-load conditions. For the same load requirements, the transmission teeth of this structure can be designed to be smaller, greatly saving housing space, which is crucial for the design of plunger pumps.

[0045] Furthermore, in other embodiments according to the present disclosure, the first bevel gear 482 , the second bevel gear 472 , the third bevel gear 491 , and the fourth bevel gear 492 may alternatively be helical cylindrical gears.

[0046] The scope of the present disclosure is not limited by the above-described embodiments but only by the appended claims and their equivalents.

Claims

1. A plunger pump, characterized in that: include: Rotation axis; a first gear non-rotatably coaxially fixed to the rotating shaft to receive rotational power from the rotating shaft; an impeller disposed in a suction flow path for a pressure medium of the plunger pump; a second gear meshing with the first gear and connected to the impeller; as well as a third gear meshing with the first gear and configured to extract the power of the rotating shaft to the outside of the plunger pump; Wherein, a rotation axis of at least one of the second gear and the third gear is not parallel to a rotation axis of the first gear.

2. The plunger pump according to claim 1, characterized in that The angle between the rotation axis of the second gear and the rotation axis of the first gear is approximately 90 degrees, and The included angle between the rotation axis of the third gear and the rotation axis of the first gear is approximately 90 degrees.

3. The plunger pump according to claim 1 or 2, characterized in that The first gear, the second gear, and the third gear are bevel gears.

4. The plunger pump according to claim 1 or 2, characterized in that The first gear, the second gear, and the third gear are helical bevel gears, and each transmission tooth of each of the first gear, the second gear, and the third gear extends obliquely in an arc shape in a radial direction.

5. The plunger pump according to claim 2, characterized in that Also includes: a fourth gear meshing with the first gear and configured to extract power from the rotating shaft to the outside of the plunger pump; The angle between the rotation axis of the fourth gear and the rotation axis of the first gear is approximately 90 degrees, and A rotation axis of the fourth gear is parallel to a rotation axis of the third gear.

6. The plunger pump according to claim 5, characterized in that Also includes: a first output coupling non-rotatably coaxially fixed to the third gear; as well as A second output coupling is coaxially and non-rotatably fixed to the fourth gear.

7. The plunger pump according to claim 1 or 2, characterized in that: The second gear is non-rotatably fixed coaxially to the impeller.

8. The plunger pump according to claim 1 or 2, characterized in that: The impeller has a disk-shaped body and a circumferential wall surrounding the disk-shaped body and protruding from the disk-shaped body in the axial direction of the impeller. The impeller covers a portion of a housing of the plunger pump where a suction port for sucking a pressure medium is provided, such that the circumferential wall surrounds the suction port.

9. The plunger pump according to claim 8, characterized in that The circumferential wall has an end annular section away from the disc-shaped body, and the side surface of the end annular section is slidably matched with the side surface of the corresponding circular closed structure of the housing of the plunger pump to support and position the impeller. The corresponding circular closed structure surrounds the suction port.

10. A plunger pump assembly, characterized in that: include: The plunger pump according to any one of claims 1 to 9, and a second plunger pump having a second rotating shaft fixed coaxially and non-rotatably to the rotating shaft of the plunger pump via a coupling, wherein the first gear is non-rotatably fixed coaxially to the coupling, The plunger pump and the second plunger pump share the suction flow path.

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