Pump device

Abstract

The invention 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 invention, the two displacement adjusting mechanisms are located on the same side of the first pump and the second pump, and the two displacement adjusting mechanisms are arranged in a mirror image mode. 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 present invention relates to the technical field of hydraulic systems, and in particular to a pump device. Background Art

[0002] In the prior art, 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, the document with application number CN200680029641.3 discloses a pump device, which has two pump units and a valve unit, and also has two regulators. Each pump unit is coaxially arranged with the valve unit, and the axis of each pump unit and the valve unit forms the axis of the pump device. Each pump unit and the valve unit are arranged along the axis of the pump device and connected to each other, and the valve unit is sandwiched by each pump unit. Each regulator is arranged on the upper part of each pump unit and connected to the pump unit respectively. Each pump unit has a pump housing, and each pump housing contains components such as a cylinder body, a piston, and a swash plate. The valve unit has a valve housing, and the valve housing contains two valve plates that can slide on each cylinder body of each pump unit respectively. The valve housing and the valve plate can also be formed as one piece or separately. Each regulator has a regulator housing, and each regulator housing contains a structure for tilting the swash plate. The front and rear pump variable mechanism in the above-mentioned pump device adopts 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] Another example is the document with application number CN201180033654.9, which discloses a hydraulic dual axial piston machine. Instead of simply installing two separate axial piston pumps adjacent to each other in a back-to-back position, a common main component 13 of a housing is provided for the two sub-pumps. The main component can be regarded as being composed of two housing tanks, which form a single intermediate block with their bottoms, and the walls of the housing tanks stand up from the intermediate block in opposite directions. At the free edge, the housing tank is closed by a cover and the housing tank is closed by a cover. A transmission mechanism of a sub-pump is provided in each of the two spaces respectively closed by a housing tank and a cover. Each transmission mechanism has a transmission shaft. The two transmission shafts have a common axis and are rotatably supported in a cover and supported in the intermediate block or supported in an embedded ring not shown in detail embedded in the intermediate block. In order to adjust the swash plate to any intermediate position between the two end positions, an outward swinging piston and an inward swinging piston are provided as adjustment pistons, which are arranged at two corners of the housing that are not occupied by the stop screws and whose longitudinal axes extend parallel to the axis of the transmission shaft in the initial position of the swash plate. The inward swinging piston has a piston flange with a large effective surface, and the inward swinging piston is guided in a sleeve fixed to the housing and arranged parallel to the axis of the transmission shaft through the piston flange in a sealed manner and can be slightly swung while maintaining the sealing effect. In the sleeve, an adjustment chamber is defined by the piston flange, and the pressure medium is supplied to the adjustment chamber through the regulating valve to reduce the swing angle of the swash plate, and if the swing angle of the swash plate is to be expanded, the pressure medium can flow out of the adjustment chamber through the regulating valve. The two sub-pumps in the above-mentioned hydraulic double axial piston machine adopt double pistons, but adopt an axial layout, the axial length of the entire pump is very long, and the corresponding displacement adjustment components and regulators are all arranged axially, the positions are scattered and the space is small, which is not convenient for debugging. Summary of the invention

[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 present invention provides a pump device that solves the above technical problem.

[0006] In order to solve the above technical problems, the present invention provides a pump device, comprising: First pump; a second pump, coaxially arranged with the first pump; An intermediate body, the intermediate body is located between the first pump and the second pump and connected as one body, and the pump shafts of the first pump and the second pump extend into the intermediate body to work in conjunction with each other; Displacement regulating mechanism, there are two displacement regulating mechanisms, the two displacement regulating mechanisms are respectively arranged corresponding to the first pump and the second pump, and the displacement regulating mechanisms are arranged perpendicular to the axial direction.

[0007] 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.

[0008] 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.

[0009] 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, wherein one 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.

[0010] According to one embodiment of the present invention, it further comprises 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.

[0011] 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.

[0012] According to an 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.

[0013] 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.

[0014] According to one embodiment of the present invention, a power taking port is also provided on the intermediate body, and the power taking ports are two and coaxially arranged. The pump shaft of the first pump and / or the second pump drives the impeller through a transmission assembly and is transmitted to the power taking port at the same time.

[0015] According to one embodiment of the present invention, 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 meshed 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, and the third bevel gear is distributed in the power take-off port.

[0016] Based on the above technical solution, the technical effects that can be achieved by the present invention are: The pump device of the present invention is provided with a displacement adjustment mechanism perpendicular to the axial direction, and the two displacement adjustment mechanisms are located on the same side and are arranged in a mirror image, so that 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; The pump device of the present invention uses a locking screw sleeve to lock the displacement adjustment component, and a sealing ring groove is processed 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 be used as a protective cover, which has protection and anti-collision functions; In the pump device of the present invention, the regulator is arranged parallel to the displacement regulating mechanism, which shortens the axial dimension, increases the regulating space, reduces the installation space, and realizes a compact structure; The pump device of the present invention sets the impeller perpendicular to the axial setting, and the pump shaft of the first pump and / or the second pump drives the impeller through the transmission assembly, so the impeller does not need to be set axially, which makes it easy 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, thereby playing a boosting role. The technical problem in the prior art that the impeller cannot have both the impeller and the power take-off port due to the axial installation of the impeller and the installation position and space of the power take-off port transmission gear are the same, and only one of the two can be set is solved; two power take-off ports are set, and the two power take-off ports are arranged oppositely, the rotation direction of the pump shaft and the rotation direction of the power take-off port can be selected and freely combined, and the parts are the same, no new parts are needed, and the rotation direction of the third bevel gear of the power take-off port can be changed by adjusting the installation position of the first bevel gear; The pump device of the present invention is provided with a bevel gear transmission as the transmission component, so that the impeller can be driven by the pump shaft to work when the impeller is arranged perpendicular to the axial direction, thereby playing a pressure-boosting role; at the same time, the pump shaft can also be transmitted to the power take-off port; 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 in which four screws are used 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, and can avoid blocking the intermediate body to fully utilize all working surfaces of the intermediate body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the pump device of the present invention; Figure 2 is a front view of the pump device; Figure 3 is a top view of the pump device; Figure 4 is a bottom view of the pump device; Figure 5 It is a schematic diagram of the back structure of the pump device; Figure 6 is a cross-sectional view of a pump device; Figure 7 is a cross-sectional view of the intermediate body; Figure 8 is a cross-sectional view of the intermediate body perpendicular to the axial direction; Fig. 9 It is a schematic diagram of the structure of two pumps cooperating with a displacement adjustment mechanism; Fig.10 It is a schematic diagram of the structure of the displacement adjustment mechanism installed on a single pump; Fig.11 A cross-sectional view of the piston cooperating with a displacement adjustment assembly at one end; 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; 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

[0018] 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 described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means 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 creative work are within the scope of protection of the present invention.

[0019] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, 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 the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a 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 exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0021] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, 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 devices or elements 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 contours of each component itself.

[0022] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. 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 figure. For example, if the device in the accompanying 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.

[0023] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0024] 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 arranged and 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.

[0025] 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 basically assembled in a mirror image. The first swash plate 12 of the first pump 1 is arranged away from the second pump 2, and the second swash plate 22 of the second pump 2 is arranged away from the first pump 1. The distribution plates of the two pumps are arranged close to 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, and the first pump shaft 11 and the second pump shaft 21 both extend into the intermediate body 3 and are in transmission cooperation.

[0026] As a preferred technical solution of this embodiment, the first pump shaft 11 and the second pump shaft 21 are matched through the shaft sleeve 8. Part of the shaft sleeve 8 is sleeved on the end of the first pump shaft 11 located in the intermediate body 3, and part of the shaft sleeve 8 is sleeved on the end of the second pump shaft 21 located in the intermediate body 3.

[0027] 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.

[0028] The intermediate body 3 is located between the first pump 1 and the second pump 2. The intermediate body 3 is in a square shape, and the two ends of the intermediate body 3 are respectively fixedly connected to the first pump 1 and the second pump 2. The intermediate body 3 is a hollow structure, and the first pump shaft 11 and the second pump shaft 21 can both extend into the intermediate body 3 and then be linked through the shaft sleeve 8.

[0029] 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 respectively located around 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 respectively located around the intermediate body 3. There is no need to set a long screw through the connection, so as to achieve the effect of weight reduction and compactness. Preferably, the fastener can be set as a screw, and one end of the intermediate body 3 can be connected to the first pump 1 by 4 screws or 8 screws, and the other end of the intermediate body 3 can be connected to the second pump 2 by 4 screws or 8 screws.

[0030] 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 .

[0031] 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, and the oil suction port and the oil outlet are located on two opposite surfaces of the intermediate body 3.

[0032] As a preferred technical solution of this embodiment, the oil suction channel 31 can be set as one, and the one 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.

[0033] An impeller 5 is arranged in the intermediate body 3, and the impeller 5 can play a role of boosting. In this embodiment, the impeller 5 is arranged in the oil suction passage 31, and is arranged perpendicular to the axial direction, that is, the axis of the impeller 5 is arranged perpendicular to the axis of the first pump 1 and the second pump 2. The first pump shaft 11 and / or the second pump shaft 2 drives the impeller 5 through the transmission assembly 4.

[0034] 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 meshed 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 supercharging role.

[0035] 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.

[0036] As a preferred technical solution of this embodiment, the transmission assembly 4 further includes a third bevel gear 43, two third bevel gears 43 are provided, the two third bevel gears 43 are respectively located in the two power take-off ports 33, and the two third bevel gears 43 are meshed with the first bevel gear 41. Through the transmission assembly 4, the sleeve 8 can drive the impeller 5 and transmit it to the power take-off port 33 at the same time.

[0037] 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.

[0038] As a preferred technical solution of this embodiment, the intermediate body 3 has two power take-off ports 33, which are located on both sides and can be connected in series with an auxiliary pump. The two oil outlets can be located on the upper surface of the intermediate body 3, and one oil suction port can be located on the lower surface of the intermediate body 3. An impeller 5 is installed in the oil suction passage 31, which is driven by a bevel gear and is perpendicular to the axis of the main shaft, so that the first pump 1 and the second pump 2 have a power take-off port 33 for power output while increasing pressure and speed.

[0039] In order to achieve displacement adjustment, the first pump 1 and / or the second pump 2 is also provided with a displacement adjustment mechanism 6, which is used to adjust the displacement of the pump. In order to reduce the axial size and save installation space, the displacement adjustment mechanism 6 is arranged perpendicular to the axial direction.

[0040] The displacement regulating mechanism 6 comprises a piston 61 and a displacement regulating assembly 62. The displacement regulating assembly 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 regulating assemblies 62 is a large displacement regulating assembly, and the other group of displacement regulating assemblies 62 is a small displacement regulating assembly. The large displacement regulating assembly and the small displacement regulating assembly have the same structure.

[0041] 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 matched 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 matched with the locking screw sleeve 622 and is located in the locking screw sleeve 622. The end surface of the locking screw sleeve 622 close to the piston 61 is provided with an annular groove to assemble the sealing ring 623, and the other end of the locking screw sleeve 622 is assembled with the plug screw 624 to form a seal. The locking screw sleeve 622 is used for locking and the sealing ring 623 is used for sealing, so the service life is greatly improved. During debugging, the screw plug 624 can be removed, and the debugging tool enters the adjustment screw 621 through the light hole of the locking screw sleeve 622. After debugging, 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.

[0042] As a preferred technical solution of this embodiment, the first pump 1 and the second pump 2 are respectively provided with a displacement adjustment mechanism 6, the two displacement adjustment mechanisms 6 are located on the same side of the first pump 1 and the second pump 2, the two displacement adjustment mechanisms 6 have the same structure, and are arranged in mirror symmetry with respect to the central plane of the intermediate body 3. The pistons 61 of the first pump 1 and the second pump 2 are parallel, and the displacement adjustment components 62 are respectively located on both sides of the pumps.

[0043] The pump device of this embodiment is also provided with a regulator 7, which is provided corresponding to the displacement adjustment mechanism 6, and two regulators 7 are respectively installed on the first pump 1 and the second pump 2; the installation direction of the regulator 7 is perpendicular to the main shaft axis direction and parallel to the piston 61 direction, and the regulator 7 includes a valve core arranged in the valve body, and one end of the valve core is provided with an adjustment component 71, and the other end of the valve core is provided with an electromagnet 72, that is, the adjustment component 71 and the electromagnet 72 are respectively facing the two sides of the pump. The two regulators 7 are arranged in a mirror-symmetrical manner relative to the central plane of the intermediate body 3, and the adjustment components 71 of the two regulators 7 are arranged on the same side, which is the same side as the small displacement adjustment component, and the electromagnets 72 of the two regulators 7 are arranged on the same side, which is the same side as the large displacement adjustment component. Since all the adjustment devices are concentrated and the adjustment space is large, the debugging process is greatly facilitated. The adjustment component 71 can be specifically set as an adjustment screw, and an elastic member is provided between the adjustment screw and the valve core, which can play an adjustment role by adjusting the axial length of the adjustment screw extending into the valve body. After the adjustment screw is adjusted in place, it can be locked by a locking nut.

[0044] 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.

[0045] Based on the above structure, the pump device of this embodiment is specifically a series plunger double pump for walking machinery, and its working process is as follows: 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 the regulator to change, thereby moving the piston 61, driving the swash plate to rotate to the corresponding position, and changing the pump displacement.

[0046] 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 nut sleeve 622 to adjust the adjusting screw 621.

[0047] When the rotation direction of the first pump 1 and the second pump 2 needs to be changed, the piston 61 and the regulator 7 of the first pump 1 and the second pump 2 are rotated 180° and assembled in reverse, and the rotating parts of the cylinders of the first pump 1 and the second pump 2 are exchanged. If the pump device is changed from right-handed to left-handed, if the small displacement adjustment component of the piston 61 is facing right, the small displacement adjustment component of the piston 61 is installed to the left; the adjustment component 71 and the electromagnet 72 of the regulator 7 are also adjusted in direction to each other. Then, install the rotating cylinder of the first pump 1 into the second pump 2, and install the rotating cylinder of the second pump 2 into the first pump 1. When the output rotation direction of the power take-off port 33 needs to be changed, the first bevel gear 41 is mirror-mounted to the opposite side and the corresponding rotation impeller is installed.

[0048] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of 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) being located between the axial directions of the first pump (1) and the second pump (2) and connected as one body, the pump shafts of the first pump (1) and the second pump (2) extending into the intermediate body (3) for linkage; A displacement regulating mechanism (6), wherein there are two displacement regulating mechanisms (6), the two displacement regulating mechanisms (6) are respectively arranged 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 to 2, characterized in that: The displacement adjustment mechanism (6) comprises a piston (61), and displacement adjustment components (62) are respectively arranged on two axial sides of the piston (61), the displacement adjustment component (62) on one side being used for large displacement adjustment, and the displacement adjustment component (62) on the other side being used for small displacement adjustment.

4. A pump device according to claim 3, characterized in that: The displacement adjustment assembly (62) comprises 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); the other end of the adjusting screw (621) extends out of the locking screw sleeve (622); a sealing ring (623) is provided on an 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 adjustment 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 arranged 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, and the two adjusting components (71) are arranged on the same side as a displacement adjusting component (62) for small displacement adjustment, and the two electromagnets (72) are arranged on the same side as a 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 arranged in the intermediate body (3), an impeller (5) is arranged 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), and the power take-off ports (33) are 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) comprises 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 a 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 meshed with the first bevel gear (41); the second bevel gear (42) is distributed in the oil suction passage (31) perpendicular to the axial direction; the second bevel gear (42) drives the impeller (5) to rotate; and the third bevel gear (43) is distributed in the power take-off port (33).

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