A hydraulic pump

Abstract

This invention discloses a hydraulic pump, comprising a housing with an inner cavity including a suction chamber, an alternating chamber, and a discharge chamber. The hydraulic pump includes a suction assembly and a discharge assembly disposed within the inner cavity. The suction assembly is configured to open to connect the suction chamber and the alternating chamber or to close to isolate the suction chamber and the alternating chamber. The discharge assembly is configured to open to connect the discharge chamber and the alternating chamber or to close to isolate the discharge chamber and the alternating chamber. The hydraulic pump further includes a drive assembly, which is drivenly connected to at least a portion of the suction assembly and at least a portion of the discharge assembly. This invention solves the technical problem of difficulty in adjusting the output flow rate of a hydraulic pump.

Description

Technical Field

[0001] This invention relates to the field of hydraulic equipment technology, and in particular to a hydraulic pump. Background Technology

[0002] Existing reciprocating plunger pumps include a suction valve core and a discharge valve core. During the movement of the plunger, the pressure inside the pump chamber changes, thereby opening and closing the suction valve core and the discharge valve core. However, the opening and closing of the suction valve core and the discharge valve core rely on the movement of the plunger. The suction valve core and the discharge valve core are passively opened or closed, making it difficult to adjust the output flow of the plunger pump. Summary of the Invention

[0003] The present invention aims to at least solve the technical problem in the prior art that the opening and closing of the suction valve core and the discharge valve core rely on the movement of the plunger, and the suction valve core and the discharge valve core are passively opened or closed, making it difficult to adjust the output flow of the plunger pump.

[0004] Therefore, one object of the present invention is to provide a hydraulic pump comprising a hydraulic end assembly, the hydraulic end assembly comprising a housing, the housing comprising an inner cavity, the inner cavity comprising a suction chamber, an alternating chamber, and a discharge chamber, the hydraulic end assembly comprising a suction component and a discharge component disposed in the inner cavity, the suction component being configured to open to communicate the suction chamber and the alternating chamber or configured to close to isolate the suction chamber and the alternating chamber; the discharge component being configured to open to communicate the discharge chamber and the alternating chamber or configured to close to isolate the discharge chamber and the alternating chamber; the hydraulic end assembly further comprising a drive component, the drive component being drivenly connected to at least a portion of the suction component and at least a portion of the discharge component.

[0005] In some embodiments, the drive assembly includes a push rod and a drive member, the drive end of the drive member being connected to one end of the push rod, and the other end of the push rod being connected to at least one of at least a portion of the liquid aspiration assembly and at least a portion of the liquid drainage assembly, wherein the drive member drives the push rod to be movably disposed.

[0006] In some embodiments, the drive assembly further includes a push rod spring, a first spring seat, and a second spring seat. The first spring seat and the second spring seat are respectively disposed on the push rod and spaced apart along the length direction of the push rod. The push rod spring is sleeved on the outer periphery of the push rod, and both ends of the push rod spring abut against the first spring seat and the second spring seat, respectively.

[0007] In some embodiments, the hydraulic end assembly includes a controller configured to control at least one of the following: the time when the liquid suction assembly is turned on, the time when the liquid suction assembly is turned off, the time when the liquid discharge assembly is turned on, and the time when the liquid discharge assembly is turned off.

[0008] In some embodiments, the liquid aspiration assembly includes a liquid aspiration valve seat, a liquid aspiration valve core, and a liquid aspiration spring. The liquid aspiration valve seat has a first through hole, the liquid aspiration valve core passes through the first through hole and is slidably disposed to open or block the first through hole, and at least a portion of the liquid aspiration spring is sleeved on the outer periphery of the liquid aspiration valve core; and / or,

[0009] The drainage assembly includes a drainage valve seat, a drainage valve core, and a drainage spring. The drainage valve seat has a second through hole. The drainage valve core passes through the second through hole and is slidably disposed to open or block the second through hole. At least a portion of the drainage spring is sleeved on the outer periphery of the drainage valve core.

[0010] In some embodiments, the suction chamber and the discharge chamber are arranged along the extension direction of the first axis of the inner cavity, and the alternating chamber is arranged along the extension direction of the second axis, wherein the first axis intersects the second axis.

[0011] In some embodiments, the liquid suction assembly includes a liquid suction valve seat, a liquid suction valve core, and a liquid suction spring. The liquid suction valve seat is provided with a first through hole. At least a portion of the liquid suction valve core passes through the first through hole and is slidably disposed to open or block the first through hole. At least a portion of the liquid suction spring is sleeved on the outer periphery of the liquid suction valve core.

[0012] The drainage assembly includes a drainage valve seat, a drainage valve core, and a drainage spring. The drainage valve seat is provided with a second through hole. At least a portion of the drainage valve core passes through the second through hole and is slidably disposed to open or block the second through hole. At least a portion of the drainage spring is sleeved on the outer periphery of the drainage valve core.

[0013] A portion of the drain spring is disposed on the outer periphery of the drain valve core, and another portion of the drain spring is disposed on the outer periphery of the suction valve core. The suction valve core and the drain valve core are spaced apart along the extension direction of the first axis.

[0014] In some embodiments, the suction valve core extends radially outward to form a protrusion, and the discharge valve core includes a first segment and a second segment connected in sequence, the radial distance between the first segment and the radial distance between the second segment is smaller, one end of the discharge spring is sleeved on the first segment, and the other end of the discharge spring abuts against the protrusion.

[0015] In some embodiments, the housing is provided with a liquid suction port and a liquid discharge port, the liquid suction port is connected to the liquid suction chamber, the liquid discharge port is connected to the liquid discharge chamber, and the liquid discharge port is connected to the liquid tank.

[0016] In some embodiments, the drive component includes a high-speed switching valve.

[0017] The hydraulic pump provided in this embodiment of the invention has the following beneficial effects:

[0018] By setting the drive component to actively open or close the liquid suction component and / or the liquid discharge component, during the liquid discharge stage, by actively closing the liquid suction component and / or the liquid discharge component, some fluid can be prevented from flowing back to the liquid tank, thereby achieving stepless, precise and rapid adjustment from zero flow rate to full flow rate, and realizing precise control of the fluid flow between the liquid suction chamber and the alternating chamber, and between the liquid discharge chamber and the alternating chamber. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the hydraulic end assembly in an embodiment of the present invention;

[0021] Figure 2 This is the present invention. Figure 1 A magnified view of a portion of the image;

[0022] Figure 3 This is a simplified structural diagram of the hydraulic pump in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the hydraulic end assembly in an embodiment of the present invention;

[0024] Figure 5 This is a perspective view of the hydraulic end assembly in an embodiment of the present invention;

[0025] Figure 6 This is a front view of the hydraulic end assembly in an embodiment of the present invention.

[0026] Figure label:

[0027] 1. Shell; 11. Inner cavity; 111. Suction chamber; 112. Alternating chamber; 113. Drainage chamber; 12. Suction port; 13. Drainage port; 14. Cover plate;

[0028] 2. Liquid suction assembly; 21. Liquid suction valve seat; 211. First through hole; 22. Liquid suction valve core; 221. Protrusion; 23. Liquid suction spring; 24. Liquid suction spring seat;

[0029] 3. Drainage assembly; 31. Drainage valve seat; 311. Second through hole; 32. Drainage valve core; 321. First stage; 322. Second stage; 33. Drainage spring;

[0030] 4. Drive assembly; 41. Push rod; 42. Drive component; 43. Push rod spring; 44. First spring seat; 45. Second spring seat; 46. Mounting base; 461. Interface;

[0031] 5. Liquid tank;

[0032] 6. Plunger. Detailed Implementation

[0033] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0034] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of the invention will be apparent to those skilled in the art.

[0035] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

[0036] These and other features of the invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0037] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0038] The above and other aspects, features and advantages of the invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0039] Specific embodiments of the invention are described below with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the invention, which can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the invention in various ways with substantially any suitable detailed structure.

[0040] The first embodiment of the present invention provides a hydraulic end assembly, such as Figures 1-6 As shown, the device includes a housing 1, which includes an inner cavity 11. The inner cavity 11 includes a liquid absorption cavity 111, an alternating cavity 112, and a liquid discharge cavity 113. The inner cavity 11 of the housing 1 has a T-shaped structure. The liquid absorption cavity 111 and the liquid discharge cavity 113 are arranged along the extension direction of a first axis of the inner cavity 11, and the alternating cavity 112 is arranged along the extension direction of a second axis. The first axis and the second axis intersect.

[0041] For example, the first axis and the second axis are perpendicular to each other. By designing the inner cavity 11 as a T-shaped structure and making reasonable spatial arrangements, the liquid suction cavity 111 and the liquid discharge cavity 113 extend along the direction of the first axis. The alternating cavity 112 is set at the connection between the liquid suction cavity 111 and the liquid discharge cavity 113, and the alternating cavity 112 extends along the second direction. This is conducive to realizing the connection or disconnection between the liquid suction cavity 111 and the alternating cavity 112, as well as the connection or disconnection between the liquid discharge cavity 113 and the alternating cavity 112.

[0042] Furthermore, the housing 1 is provided with a liquid suction port 12 and a liquid discharge port 13. The liquid suction port 12 is connected to the liquid suction chamber 111, and the liquid discharge port 13 is connected to the liquid discharge chamber 113. The liquid discharge port 13 is also connected to the liquid tank 5. Here, the liquid suction port 12 is connected to the liquid suction chamber 111 and is used to draw liquid from the liquid tank 5; the liquid discharge port 13 is connected to the liquid discharge chamber 113 and is used to guide the fluid back to the liquid tank 5 or output it to the load.

[0043] Furthermore, the hydraulic end assembly includes a liquid suction component 2 and a liquid discharge component 3 disposed in the inner cavity 11. The liquid suction component 2 is configured to open to connect the liquid suction chamber 111 and the alternating chamber 112 or to close to isolate the liquid suction chamber 111 and the alternating chamber 112. The liquid discharge component 3 is configured to open to connect the liquid discharge chamber 113 and the alternating chamber 112 or to close to isolate the liquid discharge chamber 113 and the alternating chamber 112. The hydraulic end assembly also includes a drive component 4, which is drivenly connected to at least one of at least a portion of the liquid suction component 2 and at least a portion of the liquid discharge component 3.

[0044] The drive component 4 is connected to at least one of the liquid suction component 2 and the liquid discharge component 3, allowing the hydraulic end to actively control the liquid suction volume, liquid discharge volume, or both. This enables control of the liquid flow to the liquid tank 5 according to the needs of the working face, meeting the flow requirements of scenarios such as long-distance liquid supply and fracturing operations in coal mines. For example, the drive component 4 can be driven to the liquid suction component 2, or it can be driven to the liquid discharge component 3. Alternatively, there can be two drive components 4, one driven to the liquid suction component 2 and the other driven to the liquid discharge component 3.

[0045] This invention, by configuring a drive assembly 4 to actively open and close the suction assembly 2 and / or the discharge assembly 3, can actively prevent some fluid from flowing back to the liquid tank 5 during the discharge phase by actively closing the suction assembly 2 and / or the discharge assembly 3, thereby achieving stepless, precise, and rapid adjustment from zero flow to full flow. It realizes precise timing control of the fluid flow between the suction chamber 111 and the alternating chamber 112, and between the discharge chamber 113 and the alternating chamber 112. This allows for precise and rapid regulation of the hydraulic pump's output flow. The active control capability of the drive assembly 4 significantly improves the system's response speed and control freedom. Combined with the T-shaped inner cavity 11 structure, it effectively isolates the fluid path and eliminates crossflow interference, greatly enhancing the controllability and reliability of the hydraulic pump.

[0046] For example, this solution includes at least one of the following basic operating modes:

[0047] (1) Zero flow: The liquid suction component 2 is normally open and the liquid discharge component 3 is normally open, and all the fluid flows back to the liquid tank 5;

[0048] (2) Full flow: The liquid suction component 2 is closed at the beginning of the drainage process, and the liquid drainage component 3 is closed, so all fluid is output to the load;

[0049] (3) Partial flow rate (liquid suction end control): The liquid suction component 2 is shut off in the middle of the discharge process, and only the fluid is output to the load in the later stage;

[0050] (4) Partial flow (drainage end control): Drainage component 3 is shut off in the middle of drainage, and only the fluid is output to the load in the early stage.

[0051] Specifically, the liquid suction assembly 2 includes a liquid suction valve seat 21, a liquid suction valve core 22, and a liquid suction spring 23. The liquid suction valve seat 21 has a first through hole 211. The liquid suction valve core 22 passes through the first through hole 211 and is slidably disposed to open or close the first through hole 211. At least a portion of the liquid suction spring 23 is sleeved on the outer periphery of the liquid suction valve core 22. The liquid discharge assembly 3 includes a liquid discharge valve seat 31, a liquid discharge valve core 32, and a liquid discharge spring 33. The liquid discharge valve seat 31 has a second through hole 311. The liquid discharge valve core 32 passes through the second through hole 311 and is slidably disposed to open or close the second through hole 311. At least a portion of the liquid discharge spring 33 is sleeved on the outer periphery of the liquid discharge valve core 32. During the liquid suction stage, a negative pressure is formed in the liquid suction chamber 111. Under the action of the pressure difference, the liquid suction valve core 22 overcomes the force of the liquid suction spring 23 and opens, allowing fluid to be drawn from the liquid tank 5. During the drainage stage, the pressure in the drainage chamber 113 increases, the drainage valve core 32 is forced open, and the fluid is discharged in one direction; at the same time, the suction valve core 22 automatically closes under the pressure to prevent backflow.

[0052] Further, the driving assembly 4 includes a push rod 41 and a driving member 42. The driving end of the driving member 42 is connected to one end of the push rod 41, and the other end of the push rod 41 is connected to at least one of the liquid suction assembly 2 and at least one of the liquid discharge assembly 3. The driving member 42 drives the push rod 41 to be movably configured. Exemplarily, the driving assembly 4 includes a push rod 41 and a driving member 42. The driving end of the driving member 42 is connected to one end of the push rod 41, and the other end of the push rod 41 is connected to at least one of the liquid suction valve core 22 and the liquid discharge valve core 32. The driving member 42 drives the push rod 41 to be movably configured.

[0053] Specifically, the hydraulic end includes a mounting base 46, which is mounted on the housing 1. At least a portion of the drive element 42 is disposed within the mounting base 46, which serves to support the drive element 42. When there is one drive assembly 4, the drive element 42 (such as an electromagnet, linear motor, or servo motor) acts directly on the suction valve core 22 through the push rod 41, and can actively force the suction valve core 22 to open or close at any time. It can also act directly on the discharge valve core 32 through the push rod 41, and can actively force the discharge valve core 32 to open or close at any time. When there are two drive assemblies 4, one drive element 42 acts directly on the suction valve core 22 through the push rod 41, and the other drive element 42 acts on the discharge valve core 32 through the push rod 41, and can actively force the opening or closing of at least one of the suction valve core 22 and the discharge valve core 32 at any time, thus transforming the originally passive mechanical valve into an actively controllable digital actuator.

[0054] Specifically, in one embodiment, a driving component 4 is provided, which is disposed in the suction chamber 111 or the discharge chamber 113. That is, if the driving component 4 is driven to be connected to the suction component 2, at least a part of the driving component 4 is disposed in the suction chamber 111; if the driving component 4 is driven to be connected to the discharge component 3, at least a part of the driving component 4 is disposed in the discharge valve core 32.

[0055] In another embodiment, if there are two drive components 4, at least a portion of one drive component 4 is disposed in the suction chamber 111, and at least a portion of the other drive component 4 is disposed in the discharge chamber 113. That is, one drive component 4 is driven to be connected to the suction component 2, and at least a portion of the drive component 4 is disposed in the suction chamber 111; the other drive component 4 is driven to be connected to the discharge component 3, and at least a portion of the drive component 4 is disposed in the discharge chamber 113.

[0056] In other words, this technical solution does not provide a separate independent housing space for the drive component 4, but directly sets it in the suction chamber 111, the discharge chamber 113, or one drive component 4 is set in the suction chamber 111 and the other drive component 4 is set in the discharge chamber 113. Under the premise of improving the hydraulic end, it will not affect the flow path of the liquid, nor will it affect the wiring of the hydraulic circuit outside the hydraulic end.

[0057] Furthermore, the drive assembly 4 also includes a push rod 41 spring, a first spring seat 44, and a second spring seat 45. The first spring seat 44 and the second spring seat 45 are respectively disposed on the push rod 41 and spaced apart along the length of the push rod 41. The push rod 41 spring is sleeved on the outer periphery of the push rod 41, and both ends of the push rod 41 spring abut against the first spring seat 44 and the second spring seat 45, respectively. The push rod 41 spring is sandwiched between the first spring seat 44 and the second spring seat 45, forming a pre-tightened axial elastic reset structure: after the drive component 42 is de-energized, the push rod 41 spring provides a constant and controllable restoring force, ensuring that the push rod 41 returns to its original position without delay or jamming, ensuring that the reset position of the drive assembly 4 is highly consistent in each opening and closing cycle, thereby ensuring the timing repeatability and control accuracy of flow regulation.

[0058] Furthermore, the hydraulic assembly includes a controller configured to control at least one of the following: the opening time of the suction component 2, the closing time of the suction component 2, the opening time of the discharge component 3, and the closing time of the discharge component 3. The opening or closing time of the suction component 2 controls the volumetric filling efficiency during the suction phase. During the pump's discharge phase, by controlling the opening time of the high-speed switching valves at the suction and discharge ends, a portion of the fluid is returned to the liquid tank 5, thus enabling accurate and rapid regulation of the output flow rate, achieving stepless adjustment from zero flow output to full flow output. Furthermore, the valve opening and closing sequence can also be adjusted in real time according to load pressure and flow requirements. The mounting base 46 is provided with an interface 461 for connection to the controller.

[0059] Furthermore, a portion of the drain spring 33 is disposed on the outer periphery of the drain valve core 32, and another portion of the drain spring 33 is disposed on the outer periphery of the suction valve core 22. The suction valve core 22 and the drain valve core 32 are spaced apart along the extension direction of the first axis. Using the same drain spring 33, with its two ends respectively sleeved on the suction valve core 22 and the drain valve core 32, and since the suction valve core 22 and the drain valve core 32 are spaced apart along the first axis, the drain spring 33 can laterally span the gap between them, achieving physical connection and functional reuse.

[0060] For example, the inner cavity 11 adopts a T-shaped inner cavity 11 (the first axis is a vertical axis and the second axis is a horizontal axis). The liquid suction chamber 111 is located in the upper part of the housing 1, and the liquid discharge chamber 113 is located in the lower part of the housing 1. The liquid suction chamber 111 and the liquid discharge chamber 113 are distributed vertically. This makes the liquid suction valve core 22 and the liquid discharge valve core 32 spatially distributed vertically. The liquid discharge spring 33 spans the gap between the two along the axial direction. The installation of the liquid discharge spring 33 does not require additional brackets or guide structures. It is positioned entirely by relying on the liquid suction valve core 22 and the liquid discharge valve core 32, thereby achieving structural weight reduction and space compression without sacrificing performance.

[0061] Furthermore, the suction valve core 22 extends radially outward to form a protrusion 221, and the discharge valve core 32 includes a first segment 321 and a second segment 322 connected in sequence. The radial distance of the first segment 321 is smaller than the radial distance of the second segment 322. One end of the discharge spring 33 is sleeved on the first segment 321, and the other end of the discharge spring 33 abuts against the protrusion 221. Here, one end of the drain spring 33 is sleeved on the first section 321 (narrow diameter section) of the drain valve core 32. The first section 321 of the drain valve core 32 provides axial guidance and positioning for the drain spring 33, preventing the drain spring 33 from moving radially. The other end of the drain spring 33 abuts against the protrusion 221 of the suction valve core 22, forming a rigid, gapless end face contact limit. The diameter of the first section 321 is smaller than that of the second section 322, forming a stepped structure, so that the end of the drain spring 33 is naturally stuck at the step formed by the first section 321 and the second section 322, without the need for an additional spring seat or retaining ring. The protrusion 221, as a radial extension structure of the suction valve core 22, has both limiting and bearing functions, preventing the drain spring 33 from directly pressing on the thin wall of the suction valve core 22, which would cause deformation or stress concentration.

[0062] Furthermore, the drive component 4 can be configured as a high-speed switching valve.

[0063] Furthermore, the housing 1 also includes a cover plate 14. If the drive assembly 4 is driven to connect with the liquid suction assembly 2, then the cover plate 14 is located on the side near the liquid discharge assembly 3 to block the liquid discharge chamber 113; if the drive assembly 4 is driven to connect with the liquid discharge assembly 3, then the cover plate 14 is located on the side near the liquid suction assembly 2 to block the liquid suction chamber 111. The cover plate 14 prevents the various parts inside the housing 1 from moving due to the impact of the liquid flow during the operation of the hydraulic pump. For example, a liquid suction spring 23 seat is connected to the cover plate 14, one end of the liquid suction spring 23 is fixed to the liquid suction spring 23 seat, and the other end of the liquid suction spring 23 is connected to the liquid suction valve core 22. Here, the liquid suction spring 23 seat and the liquid suction valve core 22 are spaced apart.

[0064] The present invention also provides a hydraulic pump, including the hydraulic end assembly described above. For example, the hydraulic pump is a piston pump, and the hydraulic pump further includes a piston 6, which is slidably disposed within the alternating chamber 112.

[0065] The present invention also provides a hydraulic system including the aforementioned hydraulic pump. Specifically, the hydraulic system includes a sensor, which is electrically connected to the controller and the drive assembly 4 respectively. The sensor detects the crankshaft angle of the hydraulic pump or the reciprocating displacement of the piston 6 of the hydraulic pump, thereby determining whether the hydraulic pump is in a suction state or a discharge state.

[0066] (a) Sensors are used to detect the crankshaft angle or the reciprocating motion of the plunger 6, thereby identifying the suction and discharge states of each plunger 6. By controlling the suction end drive assembly 4 to close and open the suction valve core 22 at specific times, the plunger pump can be regulated from zero flow to full flow output. For example, using a normally open high-speed switching valve, during suction, the high-speed switching valve is not controlled, and normal suction occurs. After entering the discharge stage, if the high-speed switching valve is not controlled, the high-speed switching valve at the suction end will always be open, and the fluid will flow back to the liquid tank 5, resulting in a zero flow output state. If the high-speed switching valve is closed at the beginning of the discharge stage, the suction valve core 22 will be closed, and the discharge valve core 32 will be open, causing all the fluid to flow to the working end, resulting in a full flow output state. If the high-speed switching valve is closed at a certain moment during the discharge stage, the fluid before the high-speed switching valve is closed will all flow back to the liquid tank 5, and only the fluid after the high-speed switching valve is closed will flow to the working end, resulting in a partial flow output state.

[0067] (b) Sensors are used to detect the crankshaft angle or the reciprocating motion of the plunger 6, thereby identifying the suction and discharge states of each plunger 6. The digital plunger pump's output from zero flow to full flow is controlled by opening and closing the high-speed switching valve at the discharge end at specific times. For example, using a normally open high-speed switching valve, during suction, the high-speed switching valve at the discharge end is closed for normal suction. After entering the discharge stage, if the high-speed switching valve is not controlled, it remains open, and the fluid flows back to the tank 5, resulting in a zero flow output state. If the high-speed switching valve is closed at the beginning of the discharge stage, all fluid flows to the working end, resulting in a full flow output state. If the high-speed switching valve is closed at a certain moment during the discharge stage, all fluid before the valve closure flows back to the tank 5, and only the fluid after the valve closure flows to the working end, resulting in a partial flow output state.

[0068] (c) Sensors are used to detect the crankshaft angle or the reciprocating motion of plunger 6, thereby identifying the suction and discharge states of each plunger 6. The digital plunger pump's output from zero flow to full flow is controlled by opening and closing the high-speed switching valves at specific times. For example, using normally open high-speed switching valves, during suction, the suction-end high-speed switching valve is not controlled, while the discharge-end high-speed switching valve is closed for normal suction. Upon entering the discharge stage, if one or both of the suction-end or discharge-end high-speed switching valves are not controlled, the corresponding high-speed switching valve remains open, and the fluid flows back to the tank 5, resulting in a zero flow output state. If the suction-end and discharge-end high-speed switching valves are closed at the initial moment of the discharge stage, all fluid will flow to the working end, resulting in a full flow output state. If the high-speed switching valves at the suction end and the discharge end are closed at a certain moment during the drainage stage, the fluid before both high-speed switching valves are fully closed will flow back into the liquid tank 5. Only the fluid after both high-speed switching valves are fully closed will flow to the working end, which is a partial flow output state.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0071] In the description of this invention, "a plurality of" means two or more.

[0072] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0073] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0074] In the description of this invention, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulic pump, characterized in that, The system includes a hydraulic end assembly, which includes a housing and an inner cavity. The inner cavity includes a suction chamber, an alternating chamber, and a discharge chamber. The hydraulic end assembly includes a suction component and a discharge component disposed in the inner cavity. The suction component is configured to open to connect the suction chamber and the alternating chamber or to close to isolate the suction chamber and the alternating chamber. The drainage assembly is configured to open to connect the drainage chamber and the alternating chamber or to close to isolate the drainage chamber and the alternating chamber; The hydraulic end assembly further includes a drive assembly that is drivenly connected to at least one of at least a portion of the liquid suction assembly and at least a portion of the liquid discharge assembly.

2. The hydraulic pump according to claim 1, characterized in that, The drive assembly includes a push rod and a drive member. The drive end of the drive member is connected to one end of the push rod, and the other end of the push rod is connected to at least one of the liquid suction assembly and at least one of the liquid discharge assembly. The drive member drives the push rod to be movably configured.

3. The hydraulic pump according to claim 2, characterized in that, The drive assembly further includes a push rod spring, a first spring seat, and a second spring seat. The first spring seat and the second spring seat are respectively disposed on the push rod and spaced apart along the length direction of the push rod. The push rod spring is sleeved on the outer periphery of the push rod, and both ends of the push rod spring abut against the first spring seat and the second spring seat, respectively.

4. The hydraulic pump according to claim 1, characterized in that, The hydraulic end assembly includes a controller configured to control at least one of the following: the time when the liquid suction component is turned on, the time when the liquid suction component is turned off, the time when the liquid discharge component is turned on, and the time when the liquid discharge component is turned off.

5. The hydraulic pump according to claim 1, characterized in that, The liquid suction assembly includes a liquid suction valve seat, a liquid suction valve core, and a liquid suction spring. The liquid suction valve seat has a first through hole. The liquid suction valve core passes through the first through hole and is slidably disposed to open or block the first through hole. At least a portion of the liquid suction spring is sleeved on the outer periphery of the liquid suction valve core; and / or, The drainage assembly includes a drainage valve seat, a drainage valve core, and a drainage spring. The drainage valve seat has a second through hole. The drainage valve core passes through the second through hole and is slidably disposed to open or block the second through hole. At least a portion of the drainage spring is sleeved on the outer periphery of the drainage valve core.

6. The hydraulic pump according to claim 1, characterized in that, The suction chamber and the discharge chamber are arranged along the extension direction of the first axis of the inner cavity, and the alternating chamber is arranged along the extension direction of the second axis, wherein the first axis and the second axis intersect.

7. The hydraulic pump according to claim 6, characterized in that, The liquid suction assembly includes a liquid suction valve seat, a liquid suction valve core, and a liquid suction spring. The liquid suction valve seat is provided with a first through hole. At least a portion of the liquid suction valve core passes through the first through hole and is slidably disposed to open or block the first through hole. At least a portion of the liquid suction spring is sleeved on the outer periphery of the liquid suction valve core. The drainage assembly includes a drainage valve seat, a drainage valve core, and a drainage spring. The drainage valve seat is provided with a second through hole. At least a portion of the drainage valve core passes through the second through hole and is slidably disposed to open or block the second through hole. At least a portion of the drainage spring is sleeved on the outer periphery of the drainage valve core. A portion of the drain spring is disposed on the outer periphery of the drain valve core, and another portion of the drain spring is disposed on the outer periphery of the suction valve core. The suction valve core and the drain valve core are spaced apart along the extension direction of the first axis.

8. The hydraulic pump according to claim 7, characterized in that, The suction valve core extends radially outward to form a protrusion. The discharge valve core includes a first segment and a second segment connected in sequence. The radial distance between the first segment and the second segment is smaller. One end of the discharge spring is sleeved on the first segment, and the other end of the discharge spring abuts against the protrusion.

9. The hydraulic pump according to claim 1, characterized in that, The housing is provided with a liquid suction port and a liquid discharge port. The liquid suction port is connected to the liquid suction chamber, the liquid discharge port is connected to the liquid discharge chamber, and the liquid discharge port is connected to the liquid tank.

10. The hydraulic pump according to claim 1, characterized in that, The drive assembly includes a high-speed switching valve.

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