Pump device

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a pump device. A pump device includes: a first pump; the second pump and the first pump are coaxially arranged; the intermediate body is located between the first pump and the second pump and connected with the first pump and the second pump into a whole, and pump shafts of the first pump and the second pump extend into the intermediate body to be linked; and the number of the displacement adjusting mechanisms is two, the two displacement adjusting mechanisms are arranged corresponding to the first pump and the second pump respectively, and the displacement adjusting mechanisms are arranged perpendicular to the axial direction. According to one embodiment of the utility model, the two displacement adjusting mechanisms are positioned on the same side of the first pump and the second pump and are arranged in a mirror image manner. The technical problems that in the prior art, a double-pump structure is large in axial length and inconvenient to install and debug are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a pump device. Background Art

[0002] In the existing technology, the space for carrying pumps in mobile machinery such as excavators is increasingly limited, requiring hydraulic pumps to be more compact. In existing tandem plunger double pumps, the variable mechanism mostly adopts an axial layout, and the axial length of the entire pump is long. If it is equipped with a boost impeller or a power take-off port, the length will be even longer, and the boost impeller and the power take-off port cannot be equipped at the same time.

[0003] For example, document CN200680029641.3 discloses a pump device comprising two pump units, a valve unit, and two regulators. Each pump unit is coaxially arranged with the valve unit, with the axes of the pump units and valve units forming the axis of the pump device. The pump units and valve units are arranged along the axis of the pump device and interconnected, with the valve units sandwiched between the pump units. Each regulator is disposed above each pump unit and connected to the pump unit. Each pump unit has a pump housing, each housing housing components such as a cylinder block, a piston, and a swash plate. The valve unit has a valve housing housing housing two valve plates that can slide separately on the cylinder blocks of each pump unit. The valve housing and valve plates can be formed integrally or separately. Each regulator has a regulator housing housing housing a structure for tilting the swash plate. The front and rear pump variable mechanisms in the above-mentioned pump device adopt a single piston. Because it adopts an axial layout, the axial length of the entire pump is very long, and the corresponding displacement adjustment components and regulators are all axially arranged, with scattered positions and small space, which is not convenient for debugging.

[0004] For example, document CN201180033654.9 discloses a hydraulic dual-axial piston machine. Rather than simply mounting two separate axial piston pumps adjacent to each other back-to-back, the two slave pumps utilize a common housing component 13. The main component can be considered to consist of two housing pots, which, with their bases, form a single intermediate block, from which the walls of the housing pots rise in opposite directions. The housing pots are closed at their free edges by a lid, and the housing pots are closed by a lid. A transmission mechanism for a slave pump is located in each of the two spaces enclosed by a housing pot and a lid, respectively. Each transmission mechanism has a drive shaft. The two drive shafts share a common axis and are rotatably supported in a lid and in the intermediate block, or in an embedded ring (not shown in detail) embedded in the intermediate block. To adjust the swash plate to any intermediate position between its two end positions, an outward-swinging piston and an inward-swinging piston serve as adjustment pistons. These pistons are located at two corners of the housing not occupied by the stop screws, and their longitudinal axes extend parallel to the axis of the drive shaft in the initial position of the swash plate. The inward-swinging piston has a piston flange with a large active surface. The inward-swinging piston is guided by this piston flange in a sleeve fixed to the housing and arranged parallel to the axis of the drive shaft, sealingly and allowing slight pivoting while maintaining a seal. An adjustment chamber is defined within the sleeve by the piston flange. Pressure medium is supplied to this adjustment chamber via a regulating valve to reduce the swash plate's pivot angle, and pressure medium can be discharged from this adjustment chamber via the regulating valve to increase the swash plate's pivot angle. The two slave pumps in the aforementioned hydraulic dual-axial piston machine utilize dual pistons, but are arranged axially, resulting in a long axial length for the entire pump. Furthermore, the corresponding displacement adjustment components and regulator are all arranged axially, resulting in dispersed locations and limited space, making adjustment difficult. Utility Model Content

[0005] In order to solve the technical problem in the prior art that the dual-pump structure has a large axial length and is inconvenient to install and debug, the utility model provides a pump device to solve the above technical problem.

[0006] In order to solve the above technical problems, the utility model provides a pump device, comprising:

[0007] First pump;

[0008] a second pump, coaxially arranged with the first pump;

[0009] An intermediate body, the intermediate body is located between the first pump and the second pump and is connected as one body, and the pump shafts of the first pump and the second pump extend into the intermediate body and are linked together;

[0010] Displacement regulating mechanism, there are two displacement regulating mechanisms, the two displacement regulating mechanisms are respectively provided corresponding to the first pump and the second pump, and the displacement regulating mechanisms are arranged perpendicular to the axial direction.

[0011] According to an embodiment of the present invention, the two displacement adjustment mechanisms are located on the same side of the first pump and the second pump, and the two displacement adjustment mechanisms are arranged in mirror symmetry with respect to the central plane of the intermediate body.

[0012] According to an embodiment of the present invention, the displacement adjustment mechanism includes a piston, and displacement adjustment components are respectively provided on both axial sides of the piston, the displacement adjustment component on one side is used for large displacement adjustment, and the displacement adjustment component on the other side is used for small displacement adjustment.

[0013] According to one embodiment of the present invention, the displacement adjustment assembly includes an adjusting screw, a locking nut, a sealing ring and a screw plug. The end of the adjusting screw away from the piston is threadedly engaged with the locking nut, and the other end of the adjusting screw extends out of the locking nut. A sealing ring is provided on the end surface of the locking nut close to the piston, and the end of the locking nut away from the piston is sealed by a screw plug.

[0014] According to one embodiment of the present invention, it further includes a regulator, which is arranged corresponding to and parallel to the displacement adjustment mechanism, and the two regulators are arranged in mirror symmetry with respect to the central plane of the intermediate body.

[0015] According to one embodiment of the present invention, the regulator includes an adjusting component and an electromagnet, and the adjusting component and the electromagnet are respectively located on both sides of the axial direction. The two adjusting components are arranged on the same side as the displacement adjusting component for small displacement adjustment, and the two electromagnets are arranged on the same side as the displacement adjusting component for large displacement adjustment.

[0016] According to one embodiment of the present invention, the intermediate body is a square body, one end of the intermediate body close to the first pump is fixedly connected to the first pump, and the other end of the intermediate body close to the second pump is fixedly connected to the second pump.

[0017] According to an embodiment of the present invention, an oil suction passage and an oil discharge passage are provided in the intermediate body, an impeller is provided in the oil suction passage, and the impeller is arranged perpendicular to the axial direction.

[0018] According to one embodiment of the present utility model, a power take-off port is further provided on the intermediate body, and the power take-off ports are two and coaxially arranged. The pump shaft of the first pump and / or the second pump drives the impeller through the transmission assembly and is simultaneously transmitted to the power take-off port.

[0019] According to one embodiment of the present utility model, the transmission assembly includes a first bevel gear, a second bevel gear and a third bevel gear. The first bevel gear is driven to rotate by the pump shaft of the first pump and / or the second pump. The second bevel gear and the third bevel gear are respectively engaged with the first bevel gear. The second bevel gear is distributed in the oil suction channel perpendicular to the axial direction. The second bevel gear drives the impeller to rotate. The third bevel gear is distributed in the power take-off port.

[0020] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0021] The pump device of the utility model is provided with a displacement adjustment mechanism perpendicular to the axial direction. The two displacement adjustment mechanisms are located on the same side and are arranged in a mirror image. Therefore, the working stroke of the piston is perpendicular to the axial direction, which greatly shortens the axial dimension, reduces the installation space, and realizes a compact design of the whole machine.

[0022] The displacement adjustment assembly of this utility model is locked with a locking screw sleeve. A sealing ring groove is machined at the bottom of the locking screw sleeve to place the sealing ring for sealing, which has a long service life and is more reliable. At the same time, the locking screw sleeve can also serve as a protective cover, with protection and anti-collision functions.

[0023] In the pump device of the utility model, the regulator is arranged in parallel with the displacement adjustment mechanism, which shortens the axial dimension, increases the adjustment space, reduces the installation space, and realizes a compact structure;

[0024] The pump device of the present invention sets the impeller perpendicular to the axial direction, and the pump shaft of the first pump and / or the second pump drives the impeller through the transmission assembly. Therefore, the impeller does not need to be set axially, which makes it easier to set the power take-off port, so that the pump device has both the function of boosting and speeding up, and the function of power output. The setting of the transmission assembly allows the pump shaft to drive the impeller to rotate, playing a boosting role. This solves the technical problem in the prior art that the impeller is axially installed, and the installation position and space of the power take-off port transmission gear are the same, resulting in the impeller and the power take-off port being unable to have both, and only one of the two can be set. Two power take-off ports are set, and the two power take-off ports are arranged relative to each other. The rotation direction of the pump shaft and the rotation direction of the power take-off port can be selected and freely combined. The parts are the same, and no new parts are needed. The rotation direction of the third bevel gear of the power take-off port can be changed by simply adjusting the installation position of the first bevel gear.

[0025] The pump device of the utility model is provided with a bevel gear transmission as the transmission component, which can realize that the impeller is driven by the pump shaft when it is arranged perpendicular to the axial direction, thereby playing a role of boosting; at the same time, the pump shaft can also be driven to the power take-off port;

[0026] In the pump device of the present invention, the intermediate body is connected to the first pump and the second pump respectively. Different from the structure in the prior art that uses four screws to penetrate and connect the first pump, the intermediate body and the second pump, the separate connection method can achieve the effect of weight reduction and compactness, avoid blocking the intermediate body, and fully utilize all working surfaces of the intermediate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the pump device of the present utility model;

[0028] Figure 2 is a front view of the pump device;

[0029] Figure 3 is a top view of the pump device;

[0030] Figure 4 is a bottom view of the pump device;

[0031] Figure 5 It is a schematic diagram of the back structure of the pump device;

[0032] Figure 6 is a cross-sectional view of the pump device;

[0033] Figure 7 is a cross-sectional view of the intermediate body;

[0034] Figure 8 is a cross-sectional view of the intermediate body perpendicular to the axial direction;

[0035] Figure 9 It is a structural diagram of the cooperation between two pumps and the displacement adjustment mechanism;

[0036] Figure 10 This is a schematic diagram of the structure of the displacement adjustment mechanism installed on a single pump;

[0037] Figure 11 A cross-sectional view of the piston mating with a displacement adjustment assembly at one end;

[0038] In the figure: 1-first pump; 11-first pump shaft; 12-first swash plate; 2-second pump; 21-second pump shaft; 22-second swash plate; 3-intermediate body; 31-oil suction channel; 32-oil discharge channel; 33-power take-off port; 4-transmission assembly; 41-first bevel gear; 42-second bevel gear; 43-third bevel gear; 5-impeller; 6-displacement adjustment mechanism; 61-piston; 62-displacement adjustment assembly; 621-adjusting screw; 622-locking nut; 623-sealing ring; 624-screw plug; 7-regulator; 71-adjusting component; 72-electromagnet; 8-sleeve; 9-connecting piece. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0042] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0045] like Figure 1-11 As shown, this embodiment provides a pump device, including a first pump 1, a second pump 2 and an intermediate body 3. The first pump 1 and the second pump 2 are coaxially spaced apart, the intermediate body 3 is located between the first pump 1 and the second pump 2, and the intermediate body 3 is respectively connected to the first pump 1 and the second pump 2 to form a whole.

[0046] The first pump 1 and the second pump 2 can be configured as plunger pumps. The first pump 1 and the second pump 2 are assembled in essentially mirror-image configurations. The first swash plate 12 of the first pump 1 is positioned away from the second pump 2, while the second swash plate 22 of the second pump 2 is positioned away from the first pump 1. The port plates of both pumps are positioned near the intermediate body 3. The first pump shaft 11 of the first pump 1 and the second pump shaft 21 of the second pump 2 are coaxially arranged. Both the first pump shaft 11 and the second pump shaft 21 extend into the intermediate body 3 and engage in transmission engagement.

[0047] As a preferred technical solution of this embodiment, the first pump shaft 11 and the second pump shaft 21 are coupled through a shaft sleeve 8. Part of the shaft sleeve 8 is sleeved on the end of the first pump shaft 11 located inside the intermediate body 3, and part of the shaft sleeve 8 is sleeved on the end of the second pump shaft 21 located inside the intermediate body 3.

[0048] As a preferred technical solution of this embodiment, the second pump 2 can continue to be connected in series with an auxiliary pump, such as a gear pump, which can provide pilot oil, etc. for the pump and the hydraulic system.

[0049] The intermediate body 3 is located between the first pump 1 and the second pump 2. The intermediate body 3 is square in shape, with its two ends fixedly connected to the first pump 1 and the second pump 2. The intermediate body 3 is hollow, and the first pump shaft 11 and the second pump shaft 21 can both extend into the intermediate body 3 and then be connected by the shaft sleeve 8.

[0050] As a preferred technical solution of this embodiment, one end of the intermediate body 3 is in close contact with the first pump 1 and is connected and fastened by fasteners, which can be located on all four sides of the intermediate body 3. The other end of the intermediate body 3 is in close contact with the second pump 2 and is connected and fastened by fasteners, which can be located on all four sides of the intermediate body 3. This eliminates the need for long screws to penetrate the connection, achieving a weight-saving and compact design. Preferably, the fasteners can be screws, with one end of the intermediate body 3 connected to the first pump 1 via four or eight screws, and the other end of the intermediate body 3 connected to the second pump 2 via four or eight screws.

[0051] An oil suction passage 31 and an oil discharge passage 32 are also provided on the intermediate body 3 . The oil suction passage 31 can supply oil to the first pump 1 and the second pump 2 , and the oil pumped out by the first pump 1 and the second pump 2 flows out through the oil discharge passage 32 .

[0052] As the preferred technical solution of this embodiment, the oil suction channel 31 and the oil outlet channel 32 are arranged opposite to each other, the oil suction channel 31 extends to the outer surface of the intermediate body 3 to form an oil suction port, and the oil outlet channel 32 extends to the outer surface of the intermediate body 3 to form an oil outlet. The oil suction port and the oil outlet are located on two opposite surfaces of the intermediate body 3.

[0053] As a preferred technical solution of this embodiment, the oil suction channel 31 can be set as one, and the oil suction channel 31 supplies oil to the first pump 1 and the second pump 2 at the same time; the oil outlet channel 32 can be set as two, corresponding to the first pump 1 and the second pump 2, and the oil pumped out by the first pump 1 and the second pump 2 flows out through the corresponding oil outlet channels 32 respectively.

[0054] An impeller 5 is installed within the intermediate body 3 to provide a boosting effect. In this embodiment, the impeller 5 is positioned within the suction passage 31, perpendicular to the axial direction. That is, the axis of the impeller 5 is perpendicular to the axes of the first pump 1 and the second pump 2. The first pump shaft 11 and / or the second pump shaft 2 drive the impeller 5 via a transmission assembly 4.

[0055] As the preferred technical solution of this embodiment, the transmission assembly 4 adopts bevel gears for transmission. The transmission assembly 4 includes a first bevel gear 41 and a second bevel gear 42. The first bevel gear 41 is sleeved on the shaft sleeve 8, and the second bevel gear 42 is located in the oil suction passage 31. The second bevel gear 42 is engaged with the first bevel gear 41. The second bevel gear 42 is coaxially arranged with the impeller 5. The second bevel gear 42 is connected to the impeller 5 through a connecting member 9. The shaft sleeve 8 can drive the first bevel gear 41 to rotate, and the second bevel gear 42 drives the impeller 5 to rotate, thereby playing a boosting role.

[0056] The intermediate body 3 is also provided with a power take-off port 33, which can be provided on two surfaces of the intermediate body 3 except the surface where the oil suction port and the oil discharge port are located. In this embodiment, two power take-off ports 33 are provided, and the two power take-off ports 33 are located on two opposite surfaces.

[0057] As a preferred technical solution of this embodiment, the transmission assembly 4 also includes two third bevel gears 43. The two third bevel gears 43 are respectively located in the two power take-off ports 33, and both third bevel gears 43 mesh with the first bevel gear 41. Through the transmission assembly 4, the sleeve 8 can drive the impeller 5 and simultaneously transmit the power to the power take-off port 33.

[0058] As a preferred technical solution of this embodiment, the rotation direction of the power take-off port 33 can be adjusted by adjusting the installation position of the first bevel gear 41. Figure 6 As shown, the first bevel gear 41 is arranged close to the first pump 1. At this time, the first bevel gear 41 drives the third bevel gear 43 to rotate along the first rotation direction; if the rotation direction needs to be adjusted, the first bevel gear 41 can be mirror-assembled close to the second pump 2. In this way, the first bevel gear 41 drives the third bevel gear 43 to rotate along the second rotation direction, thereby realizing the change of the rotation direction of the power take-off port 3.

[0059] As a preferred technical solution of this embodiment, the intermediate body 3 has two power take-off ports 33 located on either side, allowing for serial connection of auxiliary pumps. The two oil outlets can be located on the upper surface of the intermediate body 3, and the one oil intake port can be located on the lower surface of the intermediate body 3. An impeller 5 is mounted within the oil intake passage 31, driven by a bevel gear and oriented perpendicularly to the main shaft axis. This allows the first and second pumps 1 and 2 to simultaneously increase pressure and speed while also providing power output from the power take-off ports 33.

[0060] To achieve displacement adjustment, the first pump 1 and / or the second pump 2 is further provided with a displacement adjustment mechanism 6 for adjusting the displacement of the pump. In order to reduce the axial dimension and save installation space, the displacement adjustment mechanism 6 is arranged perpendicular to the axial direction.

[0061] The displacement adjustment mechanism 6 includes a piston 61 and a displacement adjustment component 62. The displacement adjustment component 62 is divided into two groups, which are respectively located on both sides of the axial direction of the piston 61. One group of displacement adjustment components 62 is a large displacement adjustment component, and the other group of displacement adjustment components 62 is a small displacement adjustment component. The large displacement adjustment component and the small displacement adjustment component have the same structure.

[0062] Taking a set of displacement adjustment components 62 as an example, the displacement adjustment component 62 includes an adjusting screw 621, a locking screw sleeve 622, a sealing ring 623 and a plug screw 624. The locking screw sleeve 622 is a sleeve-shaped structure with openings at both ends. The adjusting screw 621 extends into the locking screw sleeve 622 and is threadedly engaged with it. One end of the adjusting screw 621 extends out of the locking screw sleeve 622, close to the piston 61, and limits the piston 61; the other end of the adjusting screw 621 is threadedly engaged with the locking screw sleeve 622 and is located in the locking screw sleeve 622. The end face of the locking screw sleeve 622 close to the piston 61 is provided with an annular groove to assemble the sealing ring 623. The other end of the locking screw sleeve 622 is assembled with the plug screw 624 to form a seal. The use of locking screw sleeve 622 for locking and sealing ring 623 for sealing greatly increases the service life. During debugging, the screw plug 624 can be removed, and the debugging tool can be inserted into the adjustment screw 621 through the light hole of the locking screw sleeve 622. After debugging is completed, the locking screw sleeve 622 is tightened and the screw plug 624 is installed. This structure also forms a protective cover structure, which has a protective function.

[0063] As a preferred technical solution of this embodiment, each of the first and second pumps 1 and 2 is provided with a displacement adjustment mechanism 6. Both displacement adjustment mechanisms 6 are located on the same side of the first and second pumps 1 and 2. They have identical structures and are arranged in mirror-image symmetry with respect to the center plane of the intermediate body 3. The pistons 61 of the first and second pumps 1 and 2 are parallel, and the displacement adjustment assemblies 62 are located on either side of the pumps.

[0064] The pump device of this embodiment also includes a regulator 7, corresponding to the displacement adjustment mechanism 6. Two regulators 7 are mounted on the first pump 1 and the second pump 2, respectively. The regulators 7 are mounted perpendicular to the main shaft axis and parallel to the piston 61. Each regulator 7 comprises a valve core disposed within the valve body. An adjustment component 71 is disposed at one end of the valve core, and an electromagnet 72 is disposed at the other end. The adjustment component 71 and the electromagnet 72 face opposite sides of the pump, respectively. The two regulators 7 are arranged in mirror-image symmetry with respect to the center plane of the intermediate body 3. The adjustment components 71 of the two regulators 7 are located on the same side as the small-displacement adjustment assembly, while the electromagnets 72 of the two regulators 7 are located on the same side as the large-displacement adjustment assembly. The centralized location of all adjustment devices and the large adjustment space greatly facilitate debugging. The adjustment component 71 can be specifically configured as an adjustment screw. An elastic member is disposed between the adjustment screw and the valve core, allowing for adjustment by adjusting the axial length of the adjustment screw extending into the valve body. Once the adjustment screw is adjusted into position, it can be locked with a locknut.

[0065] As a preferred technical solution of this embodiment, the electromagnet 72 of the regulator 7 adopts a direct-acting electromagnet with good pollution resistance and fast response.

[0066] Based on the above structure, the pump device of this embodiment is specifically a series plunger double pump for a walking machine, and its working process is as follows:

[0067] When the input electrical signal changes, the thrust output by the electromagnet 72 changes, thereby pushing the valve core in the regulator 7, causing the control oil pressure output by it to change, thereby moving the piston 61 and driving the swash plate to rotate to the corresponding position, causing the pump displacement to change.

[0068] When adjusting the pump displacement, remove the screw plug 624 on the displacement adjustment assembly 62, and the sleeve of a standard wrench can be inserted into the locking screw sleeve 622 to adjust the adjusting screw 621.

[0069] To change the rotational direction of the first and second pumps 1 and 2, rotate the pistons 61 and regulators 7 180° and reassemble them in opposite directions. Swap the rotating cylinder components of the first and second pumps 1 and 2. For example, if the pump assembly is changing from right-hand to left-hand, if the small-displacement adjustment assembly of piston 61 originally faced right, install it facing left. Also, adjust the adjustment component 71 and electromagnet 72 of regulator 7 relative to each other. Then, install the rotating cylinder of the first pump 1 into the second pump 2, and the rotating cylinder of the second pump 2 into the first pump 1. To change the output rotational direction of the power take-off port 33, mirror-mount the first bevel gear 41 on the opposite side and install the impeller of the corresponding rotational direction.

[0070] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A pump device, characterized in that: include: First pump (1); A second pump (2) is coaxially arranged with the first pump (1); An intermediate body (3), the intermediate body (3) is located between the first pump (1) and the second pump (2) in the axial direction and connected to form an integral body, and the pump shafts of the first pump (1) and the second pump (2) extend into the intermediate body (3) and are linked together; A displacement regulating mechanism (6), wherein there are two displacement regulating mechanisms (6), the two displacement regulating mechanisms (6) are respectively provided corresponding to the first pump (1) and the second pump (2), and the displacement regulating mechanisms (6) are arranged perpendicular to the axial direction.

2. A pump device according to claim 1, characterized in that: The two displacement adjustment mechanisms (6) are located on the same side of the first pump (1) and the second pump (2), and the two displacement adjustment mechanisms (6) are arranged in a mirror-symmetrical manner relative to the central plane of the intermediate body (3).

3. A pump device according to any one of claims 1-2, characterized in that: The displacement adjustment mechanism (6) comprises a piston (61), and displacement adjustment components (62) are respectively provided on both axial sides of the piston (61), wherein the displacement adjustment component (62) on one side is used for large displacement adjustment, and the displacement adjustment component (62) on the other side is used for small displacement adjustment.

4. A pump device according to claim 3, characterized in that: The displacement adjustment assembly (62) includes an adjusting screw (621), a locking screw sleeve (622), a sealing ring (623) and a screw plug (624). One end of the adjusting screw (621) away from the piston (61) is threadedly engaged with the locking screw sleeve (622), and the other end of the adjusting screw (621) extends out of the locking screw sleeve (622). A sealing ring (623) is provided on the end surface of the locking screw sleeve (622) close to the piston (61), and the end of the locking screw sleeve (622) away from the piston (61) is sealed by the screw plug (624).

5. A pump device according to claim 3, characterized in that: It also includes a regulator (7), which is arranged corresponding to and parallel to the displacement regulating mechanism (6), and the two regulators (7) are arranged in a mirror-symmetrical manner relative to the central plane of the intermediate body (3).

6. A pump device according to claim 5, characterized in that: The regulator (7) comprises a valve core, and an adjusting component (71) and an electromagnet (72) are respectively provided at both ends of the valve core. The adjusting component (71) and the electromagnet (72) are respectively located on two sides of the axial direction. The two adjusting components (71) are provided on the same side as the displacement adjusting component (62) for small displacement adjustment, and the two electromagnets (72) are provided on the same side as the displacement adjusting component (62) for large displacement adjustment.

7. A pump device according to claim 1, characterized in that: The intermediate body (3) is a square body, one end of the intermediate body (3) close to the first pump (1) is fixedly connected to the first pump (1), and the other end of the intermediate body (3) close to the second pump (2) is fixedly connected to the second pump (2).

8. A pump device according to claim 1, characterized in that: An oil suction passage (31) and an oil discharge passage (32) are provided in the intermediate body (3), an impeller (5) is provided in the oil suction passage (31), and the impeller (5) is arranged perpendicular to the axial direction.

9. A pump device according to claim 8, characterized in that: The intermediate body (3) is also provided with a power take-off port (33), which is two and coaxially arranged. The pump shaft of the first pump (1) and / or the second pump (2) drives the impeller (5) through the transmission assembly (4) and is simultaneously transmitted to the power take-off port (33).

10. A pump device according to claim 9, characterized in that: The transmission assembly (4) includes a first bevel gear (41), a second bevel gear (42) and a third bevel gear (43). The first bevel gear (41) is driven to rotate by the pump shaft of the first pump (1) and / or the second pump (2). The second bevel gear (42) and the third bevel gear (43) are respectively engaged with the first bevel gear (41). The second bevel gear (42) is distributed perpendicularly to the axial direction in the oil suction passage (31). The second bevel gear (42) drives the impeller (5) to rotate. The third bevel gear (43) is distributed in the power take-off port (33).

Images