Plunger pump with double fluid ends

Abstract

The invention relates to the field of fluid machinery, in particular to a double-fluid-end plunger pump which comprises a crankcase, and a crankshaft is rotationally connected to the crankcase around a first axis; at least one eccentric part with the central axis deviating from the first axis is arranged on the crankshaft in the direction of the first axis. The same eccentric part is connected with two executing mechanisms; the executing mechanism comprises a plunger assembly and a connecting rod; one end of the connecting rod is hinged to the plunger assembly, and the other end forms a holding part with an arc-shaped inner side wall; in an assembly state, the holding parts of the two connecting rods at the same eccentric part position are rotatably held on the eccentric part; the end parts of the two holding parts are arranged at intervals to form an avoiding space; the limiting assembly comprises a positioning ring, and the positioning ring is arranged on the two holding parts in a sleeving mode. Two plunger assemblies can be installed on one eccentric part, and compared with a traditional mode that only one plunger assembly (namely a single fluid end) is installed on one eccentric part, the installation number of the plunger assemblies can be undoubtedly increased.

Description

Technical Field

[0001] The present application relates to the field of fluid machinery, and in particular to a double-hydraulic end plunger pump. Background Art

[0002] The plunger pump, as a fluid machine, mainly relies on the axial reciprocating motion of the plunger to achieve the pumping action, and the plunger is driven by the crankshaft connecting rod structure to achieve reciprocating motion. Specifically, the crankshaft rotates, driving the connecting rod to move, and then pushing the piston to reciprocate, and finally driving the plunger to reciprocate; the plunger and the connecting rod correspond one to one, and the number of the two can be one or more.

[0003] In the related art, the plunger pump is generally a single-hydraulic end plunger pump, that is, generally speaking, one or more eccentric parts are provided on the crankshaft in the axial direction of the crankshaft, and each eccentric part is connected to a corresponding connecting rod, that is, in the axial direction of the crankshaft, only one connecting rod is installed at the same position of the crankshaft. In other words, the connecting rods are arranged in sequence along the axial direction of the crankshaft. Therefore, due to the length of the crankshaft and the internal space of the crankcase, the number of connecting rods that can be installed on the crankshaft is limited, and thus the number of plungers is also limited, so there is still room for improvement. Summary of the invention

[0004] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present application is to provide a double hydraulic end plunger pump.

[0005] To achieve the above objectives, this application provides the following technical solutions.

[0006] Double hydraulic end piston pump, including Crankcase, A crankshaft is connected to the crankcase for rotation around a first axis; along the first axis, the crankshaft is provided with at least one eccentric portion whose central axis deviates from the first axis; An actuator, wherein two actuators are connected to the same eccentric part; the actuator comprises a plunger assembly and a connecting rod; the plunger assembly can reciprocate along the second axis direction, wherein the first axis is perpendicular to the second axis; one end of the connecting rod is hinged to the plunger assembly, and the other end forms a holding part with an arc-shaped inner wall; in an assembled state, the holding parts of the two connecting rods at the same eccentric part position can be rotatably held on the eccentric part, and the two holding parts are located on the same circumference with the central axis of the eccentric part as the center; an avoidance space is formed between the ends of the two holding parts, and the avoidance space is constructed so that the two holding parts can avoid each other when rotating with each other; The limiting assembly comprises a positioning ring, which is sleeved on the two holding parts and is used to limit the holding parts from escaping from the eccentric part in the radial direction.

[0007] As an optional implementation of the present application, the central angle formed by the two ends of the holding portion to the center of the eccentric portion is 140°-150°.

[0008] As an optional embodiment of the present application, the actuator also includes a bearing shell that is adapted to the inner circumferential wall of the holding portion and is in an arc shape; the bearing shell is arranged on the inner circumferential wall of the holding portion, and the two ends of the bearing shell do not exceed the two ends of the holding portion; the bearing shell is rotatably connected to the eccentric portion.

[0009] As an optional embodiment of the present application, the inner circumferential wall of the bearing shell is provided with one or more oil grooves extending along the circumference of the bearing shell.

[0010] As an optional implementation of the present application, the bearing shell is mounted on the holding portion by means of screws, and the screws are located in the oil groove and do not extend beyond the notch of the oil groove.

[0011] As an optional implementation of the present application, each holding portion is correspondingly provided with two positioning rings, and two concave steps are respectively provided on both axial sides of the outer peripheral wall of the holding portion; the two positioning rings are respectively arranged at the two concave steps.

[0012] As an optional implementation of the present application, the limiting assembly further includes a clamping member, which is clamped on the eccentric portion and is located on the side of the positioning ring away from the holding portion to limit the positioning ring from axially escaping from the holding portion.

[0013] As an optional implementation of the present application, a slot for the card to be inserted is provided on the eccentric portion at a position corresponding to the card, and / or the card is a retaining spring.

[0014] As an optional embodiment of the present application, the plunger assembly includes a plunger and a piston; a piston chamber extending along the second axis direction is provided in the crankcase, and the piston is movably arranged in the piston chamber along the second axis direction; the plunger is coaxially fixed with the piston.

[0015] As an optional implementation of the present application, all plunger assemblies are distributed on both sides of the crankcase; the plunger assemblies on both sides correspond to two cylinder heads respectively.

[0016] Compared with the prior art, this application has the following beneficial effects: In the present application, two connecting rods are arranged at the same eccentric portion position, corresponding to two plunger assemblies, so that a double-hydraulic end plunger pump can be formed. Such an arrangement is equivalent to installing two sets of plunger assemblies on one eccentric portion. Compared with the traditional method of installing only one plunger assembly (i.e., a single hydraulic end) on one eccentric portion, the number of installed plunger assemblies can undoubtedly be increased.

[0017] Moreover, in the present application, an avoidance gap is formed between the two holding parts on the same eccentric part, so as to ensure that the two holding parts do not interfere with each other during rotation and ensure their normal operation.

[0018] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easily understood. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, wherein: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0020] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 for Figure 1 A top cross-sectional view of Figure 3 This is a schematic diagram of the internal structure of this application; Figure 4 for Figure 3 A top view of Figure 5 for Figure 4 Schematic diagram of the structure from the perspective of medium AA; Figure 6 for Figure 5 Enlarged view of the middle M part; Figure 7 It is a cross-sectional view of the circlip assembled on the eccentric part; Figure 8 It is a structural schematic diagram of the connecting rod being assembled on the crankshaft; Fig. 9 This is an exploded view of the crankshaft position; Fig.10 It is a schematic diagram of the connecting rod structure.

[0021] Description of the numbers in the figure: X, first axis; Y, second axis; 1. Crankcase; 11. Piston chamber; 2. crankshaft; 21. eccentric portion; 211. slot; 3. Actuator; 31. Plunger assembly; 311. Plunger; 312. Piston; 32. Connecting rod; 320. Avoidance space; 321. Holding part; 3211. Concave step; 33. Bearing; 331. Oil groove; 4. Limiting assembly; 41. Positioning ring; 42. Circlip; 5. Cylinder head. DETAILED DESCRIPTION

[0022] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0023] See also Figure 1-10 As shown, this embodiment provides a double hydraulic end plunger pump, which includes a crankcase 1, a crankshaft 2, an actuator 3, a limit assembly 4, and a cylinder head 5.

[0024] The crankcase 1 is mainly used as a carrier for mounting the crankshaft 2, and the crankcase 1 is generally filled with lubricating oil to lubricate the movements of the mechanical parts.

[0025] like Figure 2 As shown, the crankshaft 2 is connected to the crankcase 1 and rotates around the first axis X; one end of the crankshaft 2 extends out of the crankcase 1 as a power connection end for connecting to the motor transmission; the first axis X here can be understood as the central axis of the power connection end of the crankshaft 2.

[0026] Along the first axis X direction, the crankshaft 2 is provided with at least one eccentric portion 21 whose central axis deviates from the first axis X. The number of the eccentric portions 21 is selected and designed according to actual needs, for example, Figure 2 As shown, the present embodiment shows the situation of using three eccentric parts 21; it can be understood that, in combination with Figure 8 As shown, the eccentric portion 21 is in a circular shaft-shaped structure, wherein the axis is parallel to the first axis X and deviates from the first axis X.

[0027] The actuator 3 is mainly used to be linked with the crankshaft 2. Through the rotation of the crankshaft 2, the power is transmitted to the actuator 3 so that the actuator 3 is actuated to realize the pumping action.

[0028] In this embodiment, combined with Figure 2 and Figure 8 As shown, two actuators 3 are connected to the same eccentric portion 21; the two actuators 3 are respectively arranged on both sides of the eccentric portion 21. That is to say, in this embodiment, three eccentric portions 21 correspond to six actuators 3.

[0029] Since the structures of the actuators 3 are basically the same, this embodiment only takes one of them as an example for description.

[0030] like Figure 2As shown, the actuator 3 includes a plunger assembly 31 and a connecting rod 32; the plunger assembly 31 can reciprocate along the second axis Y, wherein the first axis X is horizontally perpendicular to the second axis Y. That is, if the first axis X is understood as the longitudinal direction, the second axis Y can be understood as the transverse direction.

[0031] In some embodiments, the plunger assembly 31 mainly includes a plunger 311 and a piston 312; a piston chamber 11 extending along the second axis Y is provided in the crankcase 1. It is worth noting that each piston chamber 11 is independent of each other, and one piston chamber 11 corresponds to one piston 312; the piston 312 is movably arranged in the piston chamber 11 along the second axis Y; the plunger 311 and the piston 312 are coaxially arranged, and the ends of the plunger 311 and the piston 312 are fixed to each other. In this way, the piston 312 and the plunger 311 synchronously reciprocate axially, and the pumping of liquid is achieved through the axial reciprocating movement of the plunger 311.

[0032] One end of the connecting rod 32 is hinged to the plunger assembly 31. Specifically, one end of the connecting rod 32 is hinged to the end of the piston 312 away from the plunger 311, and the other end of the connecting rod 32 forms a holding portion 321 with an arc-shaped inner wall (see Fig.10 as shown).

[0033] like Figure 6 , Figure 8 As shown, in the assembled state, the holding portions 321 of the two connecting rods 32 at the same eccentric portion 21 are rotatably held on the eccentric portion 21 , that is, the holding portions 321 can rotate relative to the eccentric portion 21 along the circumferential direction.

[0034] like Figure 6 and Fig.10 As shown, the two holding portions 321 are located on the same circumference with the central axis of the eccentric portion 21 as the center O; the ends of the two holding portions 321 are spaced apart to form an avoidance space 320, and the avoidance space 320 is constructed so that the two holding portions 321 can avoid each other when rotating relative to each other.

[0035] It can also be understood that the two holding portions 321 are combined to form a circular ring structure that is broken in the middle; the breakpoint is the avoidance space 320; the avoidance space 320 allows the two holding portions 321 to move independently of each other without interfering with each other; in other words, assuming that the two holding portions 321 are against each other or the interval is too small, when the two holding portions 321 rotate relative to the eccentric portion 21, the ends of the two holding portions will conflict with each other, thereby limiting the normal rotation of the two holding portions 321, and making it impossible to perform the pumping action.

[0036] like Figure 6As shown, the specific structure of the avoidance space 320 is: the central angle formed by the two ends of the holding portion 321 to the center O of the eccentric portion 21 is 140°-150°; the central angle here can also be understood as the angle α formed by the end surfaces of the two ends of the holding portion 321 at the position of the center O of the eccentric portion 21, and the angle α is preferably 150°, which is equivalent to cutting off 15° from both ends of the half ring to form the holding portion 321.

[0037] The limiting assembly 4 is mainly used to position the two holding portions 321 on the same eccentric portion 21 to prevent the two holding portions 321 from falling off the eccentric portion 21. Specifically, Figure 8 and Fig. 9 As shown, the limiting assembly 4 includes a positioning ring 41, and the positioning ring 41 is simultaneously sleeved on the two holding portions 321 to limit the holding portions 321 from escaping from the eccentric portion 21 in the radial direction.

[0038] In some embodiments, each holding portion 321 corresponds to two positioning rings 41 , and the outer peripheral walls of the two holding portions 321 are also arc surfaces, and the outer peripheral walls of the two are located on the same circumference with the axis of the eccentric portion 21 as the center.

[0039] like Fig. 9 As shown, two concave steps 3211 are respectively provided on both axial sides of the outer peripheral wall of the holding portion 321; two positioning rings 41 are respectively provided at the two concave steps 3211, so that under the restriction of the positioning rings 41, the two holding portions 321 are held on the eccentric portion 21 and cannot radially fall off from the eccentric portion 21.

[0040] In some embodiments, in combination Figure 8 and Fig. 9 As shown, the limit assembly 4 also includes a clamp, and each holding portion 321 corresponds to two clamps; the clamp is clamped on the eccentric portion 21 and is located on the side of the positioning ring 41 away from the holding portion 321 to limit the positioning ring 41 from axially escaping from the holding portion 321, specifically: like Fig. 9 As shown, the clamping member is a clamping spring 42 with two ends disconnected from each other; two sides of the eccentric portion 21 are respectively provided with two clamping grooves 211 for the clamping spring 42 to be clamped; a clamping spring 42 is provided on the outer side of each positioning ring 41 (i.e., the side away from the holding portion 321); in the assembled state, as Figure 8 As shown, the positioning ring 41 is sleeved on the two holding parts 321 to limit the holding parts 321 from radially escaping from the eccentric part 21; and the two clamping springs 42 abut against the positioning ring 41 at the outer side of the positioning ring 41 to limit the positioning ring 41 from axially escaping from the holding parts 321 of the eccentric part 21. The function of the clamping groove 211 is to limit the axial deflection of the clamping spring 42.

[0041] In some embodiments, all the plunger assemblies 31 are distributed on both sides of the crankcase 1; for example, Figure 2As shown, three plunger assemblies 31 are respectively arranged on both sides of the crankshaft 2, namely three on the left and three on the right; a cylinder head 5 is arranged at both ends of the crankcase 1, the cylinder head 5 on the left corresponds to the three plunger assemblies 31 on the left, and the cylinder head 5 on the right corresponds to the three plunger assemblies 31 on the right. At this time, it is equivalent to one cylinder head 5 corresponding to one hydraulic end, and two cylinder heads 5 form two hydraulic ends.

[0042] It can be understood that the water inlet and water outlet of the plunger 311 pump are both arranged on the cylinder head 5, and each cylinder head 5 is provided with a water inlet and a water outlet; when working, the crankshaft 2 pushes the plunger 311 to reciprocate through the connecting rod 32, and the reciprocating movement of the plunger 311 drives the water inlet to absorb water and the water outlet to discharge water, thereby realizing the water pumping action.

[0043] In order to reduce the wear of the holding portion 321, in some embodiments, as Fig. 9 and Fig.10 As shown, the actuator 3 also includes a bearing shell 33 which is adapted to the inner circumferential wall of the holding portion 321 and is in an arc shape; the bearing shell 33 fits the inner circumferential wall of the holding portion 321 and is fixed on the inner circumferential wall of the holding portion 321, and in addition, the two ends of the bearing shell 33 do not exceed the two ends of the holding portion 321, and preferably, the end face of the bearing shell 33 is flush with the end face of the holding portion 321.

[0044] And the bearing shell 33 is rotatably connected to the eccentric part 21; this is equivalent to the bearing shell 33 being clamped between the eccentric part 21 and the holding part 321, and the holding part 321 will not be in direct contact with the eccentric part 21, but will be connected thereto through the bearing shell 33. In this way, when the holding part 321 rotates relative to the eccentric part 21, the bearing shell 33 and the eccentric part 21 will rub against each other, and the holding part 321 itself will not rub against the eccentric part 21, thereby reducing its own wear.

[0045] like Fig. 9 As shown, the inner circumferential wall of the bearing shell 33 is provided with one or more oil grooves 331 extending along the circumference of the bearing shell 33, and the two ends of the oil groove 331 respectively pass through the two ends of the bearing shell 33; the design purpose of the oil groove 331 is to allow the lubricating oil in the crankcase 1 to flow into the oil groove 331 through the avoidance space 320 of the two holding parts 321, so as to lubricate and dissipate heat between the bearing shell 33 and the eccentric part 21.

[0046] It is worth mentioning that the reason why the oil groove 331 can be opened on the bearing 33 in this embodiment is due to the existence of the avoidance space 320. The avoidance space 320 is equivalent to the oil port for the lubricating oil to enter the oil groove 331. Assuming that there is no avoidance space 320, the ends of the two bearings 33 are equivalent to being closed, which makes it difficult for the lubricating oil to fully enter the oil groove 331.

[0047] In some embodiments, the bearing bush 33 can be fixed on the holding portion 321 by screws. Specifically, Fig. 9 As shown, at the position of the oil groove 331, a screw is screwed into the connection between the bearing 33 and the holding portion 321, wherein the end of the screw does not exceed the notch of the oil groove 331, and is generally lower than the notch of the oil groove 331, or in other words, the end of the screw close to the eccentric portion 21 does not protrude from the inner wall of the bearing 33, thereby preventing the protruding screw from scratching the eccentric portion 21.

[0048] It can be seen that in this embodiment, the oil groove 331 has two functions: one is to collect lubricating oil, and the other is to serve as a mounting space for the screws to ensure that the screws do not protrude.

[0049] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. Double hydraulic end plunger pump, including Crankcase, A crankshaft is connected to the crankcase for rotation around a first axis; along the first axis, the crankshaft is provided with at least one eccentric portion whose central axis deviates from the first axis; An actuator, wherein two actuators are connected to the same eccentric part; the actuator comprises a plunger assembly and a connecting rod; the plunger assembly can reciprocate along the second axis direction, wherein the first axis is perpendicular to the second axis; one end of the connecting rod is hinged to the plunger assembly, and the other end forms a holding part with an arc-shaped inner wall; in an assembled state, the holding parts of the two connecting rods at the same eccentric part position can be rotatably held on the eccentric part, and the two holding parts are located on the same circumference with the central axis of the eccentric part as the center; an avoidance space is formed between the ends of the two holding parts, and the avoidance space is constructed so that the two holding parts can avoid each other when rotating with each other; The limiting assembly comprises a positioning ring, which is sleeved on the two holding parts and is used to limit the holding parts from escaping from the eccentric part in the radial direction.

2. The double hydraulic end plunger pump according to claim 1, characterized in that: The central angle formed by the two ends of the holding portion to the center of the eccentric portion is 140°-150°.

3. The double hydraulic end plunger pump according to claim 1, characterized in that: The actuator also includes an arc-shaped bearing bushing that matches the inner circumferential wall of the holding portion; the bearing bushing is arranged on the inner circumferential wall of the holding portion, and the two ends of the bearing bushing do not exceed the two ends of the holding portion; the bearing bushing is rotatably connected to the eccentric portion.

4. The double hydraulic end plunger pump according to claim 3, characterized in that: The inner peripheral wall of the bearing bush is provided with one or more oil grooves extending along the circumference of the bearing bush.

5. The double hydraulic end plunger pump according to claim 4, characterized in that: The bearing bush is mounted on the holding portion by means of screws, and the screws are located in the oil groove and do not exceed the notch of the oil groove.

6. The double hydraulic end plunger pump according to claim 1, characterized in that: Each holding portion is correspondingly provided with two positioning rings, and two concave steps are respectively provided on both axial sides of the outer peripheral wall of the holding portion; and the two positioning rings are respectively arranged at the two concave steps.

7. The double hydraulic end plunger pump according to claim 1, characterized in that: The limiting assembly also includes a clamping piece, which is clamped on the eccentric portion and is located on a side of the positioning ring away from the holding portion to limit the positioning ring from axially escaping from the holding portion.

8. The double hydraulic end plunger pump according to claim 7, characterized in that: A clamping groove for the clamping piece to be clamped is provided on the eccentric portion at a position corresponding to the clamping piece, and / or the clamping piece is a clamping spring.

9. The double hydraulic end plunger pump according to claim 1, characterized in that: The plunger assembly comprises a plunger and a piston; a piston cavity extending along the second axis direction is arranged in the crankcase, and the piston is movably arranged in the piston cavity along the second axis direction; the plunger is coaxially fixed with the piston.

10. The double hydraulic end plunger pump according to claim 1, characterized in that: All the plunger assemblies are distributed on both sides of the crankcase; the plunger assemblies on both sides correspond to the two cylinder heads respectively.

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