CN116255320A

CN116255320A - Hydraulic pumping device and engineering machinery

Info

Publication number: CN116255320A
Application number: CN202310226417.9A
Authority: CN
Inventors: 张凯; 许宏宇; 张学敏
Original assignee: Beijing Sany Intelligent Technology Co Ltd
Current assignee: Beijing Sany Intelligent Technology Co Ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-06-13

Abstract

The invention belongs to the technical field of hydraulic equipment, and particularly relates to a hydraulic pumping device and engineering machinery. The hydraulic pumping device includes: a piston cylinder; the piston mechanism is arranged in the piston cylinder, the piston mechanism divides the inner space of the piston cylinder into a plurality of power oil cavities and a plurality of medium cavities, the power oil cavities are suitable for being communicated with an external power oil pipeline, and the piston mechanism can perform linear reciprocating motion under the pressure action of power oil; the logic valve assembly is communicated with the medium cavities through pipelines and is suitable for being connected with an external medium pipeline, and the logic valve assembly can enable fluid medium in the external medium pipeline to flow unidirectionally and continuously under the action of the piston mechanism. According to the technical scheme, the piston is in a moving structure, and the piston mechanism is completely positioned in the piston cylinder, so that the problem of similar shaft end sealing during use is avoided, the sealing performance and pressure resistance of the whole structure are improved, the reliability and the environmental adaptability are high, and the piston mechanism is suitable for being applied under deep-diving working conditions.

Description

Hydraulic pumping device and engineering machinery

Technical Field

The invention belongs to the technical field of hydraulic equipment, and particularly relates to a hydraulic pumping device and engineering machinery.

Background

At present, the pumping device is commonly applied in the field of engineering machinery, such as a hydraulic pump, and the common pumping device generally adopts an electric motor (an electric motor) or a hydraulic motor as a power mechanism, and is in transmission connection with an input shaft of the pumping device to output torque so as to drive the pumping device to circularly work to convey fluid media in a flow path, thereby realizing pumping operation. However, as the application range of the engineering machinery is further expanded, some engineering machinery (such as pile driver equipment and the like) needs to operate under the working conditions of underwater or slurry and the like, but the existing pumping device is limited to the connecting structure of the input shaft and the motor, so that effective sealing is difficult to realize during operation under the working conditions, and as the submergence depth increases, the back pressure of oil return and oil drainage of the hydraulic motor also increases, the pressure resistance and reliability requirements on the rotary shaft seal of the input shaft end are higher, the existing pumping device is difficult to meet the use requirements, and is not suitable for operation under the deep submergence working conditions.

Disclosure of Invention

In view of the above, the present invention provides a hydraulic pumping device and a construction machine in order to improve at least one of the above problems existing in the prior art.

A first aspect of the present invention provides a hydraulic pumping device, including: a piston cylinder; the piston mechanism is arranged in the piston cylinder, the piston mechanism divides the inner space of the piston cylinder into a plurality of power oil cavities and a plurality of medium cavities, the power oil cavities are suitable for being communicated with an external power oil pipeline, and the piston mechanism can perform linear reciprocating motion under the pressure action of power oil; the logic valve assembly is communicated with the medium cavities through pipelines and is suitable for being connected with an external medium pipeline, and the logic valve assembly can enable fluid medium in the external medium pipeline to flow unidirectionally and continuously under the action of the piston mechanism.

In one possible implementation, a first piston chamber and a second piston chamber are provided in the piston cylinder; the piston mechanism comprises a piston rod, a first piston body and a second piston body; the first piston body is connected to one end of the piston rod, is positioned in the first piston cavity and divides the first piston cavity into a first power oil cavity and a first medium cavity which are mutually independent; the second piston body is connected to the other end of the piston rod, is positioned in the second piston cavity and divides the second piston cavity into a second power oil cavity and a second medium cavity which are independent of each other. In one possible implementation, the first medium chamber is located at an end of the first piston chamber remote from the piston rod; the second medium chamber is located at an end of the second piston chamber remote from the piston rod.

In one possible implementation, the logic valve assembly includes: the first flow path, one end of which is communicated with the first medium cavity, and the other end of which is communicated with the second medium cavity, is provided with a first control valve and a medium inlet, the medium inlet is suitable for being connected with an external medium pipeline, and the first control valve is used for controlling the fluid medium in the first flow path to flow in one direction only from the medium inlet to the first medium cavity or the second medium cavity; the second flow path is arranged in parallel with the first flow path, one end of the second flow path is connected to one end of the first flow path, which is connected with the first medium cavity, the other end of the second flow path is connected to one end of the first flow path, which is connected with the second medium cavity, and a second control valve and a medium outlet are arranged in the second flow path, and the second control valve is used for controlling the fluid medium in the second flow path to flow unidirectionally towards the medium outlet.

In one possible implementation, the first control valve includes: the first one-way valve is arranged in the first flow path, the medium inlet is connected with one side of the first medium cavity, and the oil inlet of the first one-way valve faces the medium inlet; the second one-way valve is arranged in the first flow path, the medium inlet is connected with one side of the second medium cavity, and the oil inlet of the second one-way valve faces the medium inlet.

In one possible implementation, the second control valve includes: the medium outlet in the second flow path is connected with one side of the first medium cavity, and the oil inlet of the third one-way valve is back to the medium outlet; the medium outlet in the second flow path is connected with one side of the second medium cavity, and the oil inlet of the fourth one-way valve is back to the medium outlet.

In one possible implementation, the second control valve includes: the medium outlet is arranged at the oil outlet of the shuttle valve, one oil inlet of the shuttle valve is connected to one side of the second flow path connected with the first medium cavity, and the other oil inlet of the shuttle valve is connected to one side of the second flow path connected with the second medium cavity.

In one possible implementation, the piston cylinder comprises a first cylinder body and a second cylinder body which are detachably connected, wherein the first piston cavity is positioned in the first cylinder body, and the second piston cavity is positioned in the second cylinder body; the end surfaces of the opposite ends of the first cylinder body and the second cylinder body are respectively provided with a piston hole, and a piston rod penetrates through the piston holes.

Further, in a specific implementation mode, a first annular groove is formed in the side wall surface of the first piston body, a first sealing ring is arranged in the first annular groove, and the first sealing ring is attached to the inner side wall of the first piston cavity; a second annular groove is formed in the side wall surface of the second piston body, a second sealing ring is arranged in the second annular groove, and the second sealing ring is attached to the inner side wall of the second piston cavity; the inner side wall of the piston hole is provided with a third annular groove, a third sealing ring is arranged in the second annular groove, and the third sealing ring is sleeved on the piston rod and is attached to the outer side face of the piston rod.

Further, in a specific implementation manner, a connecting sleeve is arranged between the first cylinder body and the second cylinder body, and detachable connection is formed through the connecting sleeve; the piston rod comprises a plurality of coaxially arranged sub piston rods, and any two adjacent sub piston rods are connected through a coupler.

In one possible implementation, the hydraulic pumping device further comprises: the main pump body, the piston cylinder and the logic valve assembly are all arranged in the main pump body.

The second aspect of the present invention further provides an engineering machine, including: the hydraulic pumping device of any one of the preceding claims.

The beneficial effects of the invention are as follows:

through the structural improvement and the optimization to hydraulic pumping device, utilize the linear reciprocating motion of piston mechanism to replace common rotary motion to drive piston mechanism through power oil, and piston mechanism's motion process is located the inside of piston cylinder completely, need not to stretch out the piston cylinder outside and be connected with external drive arrangement such as motor, thereby has avoided appearing the shaft end sealing problem in the similar rotary pumping device when using, is favorable to improving overall structure's sealing performance and withstand voltage performance, and reliability and environmental suitability are strong, are fit for using in environment such as underwater or mud, and can use under deep submergence operating mode. In addition, compared with some existing piston type pumping devices, the hydraulic pumping device in the embodiment has the advantages that the internal structure is simple, the processing and the assembly are convenient, continuous pumping operation can be realized, the piston mechanism can drive the flow of fluid medium during any stroke, and the operation efficiency is higher.

Drawings

Fig. 1 is a partial cross-sectional view of a hydraulic pumping device according to an embodiment of the present invention.

Fig. 2 is a partial cross-sectional view of a hydraulic pumping device (piston mechanism moved to the left) according to an embodiment of the present invention.

Fig. 3 is a partial cross-sectional view of a hydraulic pumping device (piston mechanism moved to the right) according to an embodiment of the present invention.

Fig. 4 is a partial cross-sectional view of another hydraulic pumping device (piston mechanism moved to the left) according to an embodiment of the present invention.

Fig. 5 is a partial cross-sectional view of yet another hydraulic pumping device according to one embodiment of the present invention.

Fig. 6 is a partial cross-sectional view of yet another hydraulic pumping device according to one embodiment of the present invention.

Fig. 7 is a schematic block diagram of a construction machine according to an embodiment of the present invention.

In fig. 2 to 4, solid arrows are used to indicate the flow direction of the fluid medium, and open arrows are used to indicate the flow direction of the motive oil.

Detailed Description

In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back, top, bottom … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Summary of the application

Pumping devices are one of the devices currently in wide use in the field of construction machinery, such as hydraulic pumps. At present, a common pumping device mostly adopts a rotary motion mechanism, an electric motor (an electric motor) or a hydraulic motor is used as a power mechanism, and the motor is in transmission connection with an input shaft of the pumping device to output torque so as to drive the pumping device to circularly work to convey fluid media in a flow path, so that pumping operation is realized.

With the further expansion of the application range of engineering machinery, some engineering machinery (such as pile driver equipment and the like) needs to operate under the working conditions of underwater or slurry and the like, and the requirements on the pressure resistance and reliability of the pumping device are high. The existing pumping device is limited to the connection structure of the input shaft and the motor, such as the limited sealing performance and pressure resistance of the rotary shaft seal of the input shaft end, and is difficult to realize effective sealing during operation under the working conditions, and the back pressure of oil return and oil drainage of the hydraulic motor is increased along with the increase of the submergence depth, so that the existing pumping device is difficult to reach the use requirement and is not suitable for operation under the deep submergence working conditions.

Some embodiments of the hydraulic pumping device and the construction machine according to the technical solution of the present invention are provided below.

In an embodiment of the first aspect of the present invention, a hydraulic pumping device 100 is provided, as shown in fig. 1, the hydraulic pumping device 100 comprising a piston cylinder 1, a piston mechanism 2 and a logic valve assembly 3. The piston mechanism 2 is disposed within the piston cylinder 1 and divides the interior space of the piston cylinder 1 into a plurality of power oil chambers and a plurality of medium chambers (e.g., a first power oil chamber 1111, a second power oil chamber 1211, and a first medium chamber 1112 and a second medium chamber 1212 in fig. 1); the power oil cavity can be communicated with an external power oil pipeline so as to supply oil to the power oil cavity and return oil from the power oil cavity to the external power oil pipeline; the piston mechanism 2 can do linear reciprocating motion in the piston cylinder 1 under the pressure action of the power oil in the power oil cavity, so that the space size of the medium cavity is changed, and the fluid medium is driven to flow into or flow out of the medium cavity. The logic valve assembly 3 communicates with the plurality of media chambers via lines, and in use the logic valve assembly 3 is capable of connecting an external media line such that the external media line is capable of creating an exchange of fluid media between the logic valve assembly 3 and the media chambers.

When the piston mechanism 2 performs linear reciprocating motion, the logic valve assembly 3 can be acted, so that the fluid medium in the external medium pipeline keeps unidirectional continuous flow, namely, no matter which direction the piston mechanism 2 moves, the fluid medium in the upstream pipeline of the external medium pipeline can flow into the medium cavity with increased volume through the logic valve assembly 3, and correspondingly, the fluid medium flowing out of the medium cavity with reduced volume flows into the downstream pipeline of the external medium pipeline through the logic valve assembly 3, so that the fluid medium in the external medium pipeline always keeps unidirectional flow and is in a continuous flow state, and continuous pumping operation of the fluid medium is realized.

The hydraulic pumping device 100 in this embodiment adopts the linear reciprocating motion mode of the piston mechanism 2 to replace the rotary motion mode of the rotating shaft of the existing pumping device, drives the piston mechanism 2 through power oil, and the motion process of the piston mechanism 2 is completely located inside the piston cylinder 1, and is not required to extend out of the piston cylinder 1 to be connected with external driving devices such as a motor, so that the problem of shaft end sealing similar to the rotary pumping device in use is avoided, a cylinder structure with stronger sealing performance and pressure resistance can be adopted, the reliability and environmental adaptability of the whole structure are stronger, and the hydraulic pumping device is suitable for being used in environments such as underwater or slurry, and can be applied under deep-diving working conditions.

Meanwhile, compared with some existing piston type pumping devices, the internal structure of the hydraulic pumping device 100 in this embodiment is simpler, the processing and the assembly are convenient, and the continuous pumping operation can be realized, the piston mechanism 2 can drive the flow of the fluid medium during any stroke, and the operation efficiency is higher.

In a further embodiment of the invention, as shown in fig. 1 and 2, a first piston chamber 111 and a second piston chamber 121 are provided in the piston cylinder 1 of the hydraulic pumping device 100, and the piston mechanism 2 comprises a piston rod 21 and a first piston body 22 and a second piston body 23, respectively. The first piston body 22 is connected to one end of the piston cylinder 1, and the second piston body 23 is connected to the other end of the piston rod 21 to form a double-piston type piston mechanism 2; the first piston body 22 is located in the first piston chamber 111, the second piston body 23 is located in the second piston chamber 121, and the piston rod 21 is provided in the first piston chamber 111 and the second piston chamber 121. Wherein the plurality of power oil chambers includes a first power oil chamber 1111 and a second power oil chamber 1211, and the plurality of medium chambers includes a first medium chamber 1112 and a second medium chamber 1212; the first piston chamber 111 is divided into a first power oil chamber 1111 and a first medium chamber 1112 by the first piston body 22, the second piston chamber 121 is divided into a second power oil chamber 1211 and a second medium chamber 1212 by the second piston body 23, and as the oil supply amount of the power oil in the first power oil chamber 1111 and the second power oil chamber 1211 changes, the pressure of the power oil to the piston mechanism 2 changes, the piston mechanism 2 performs linear reciprocating motion under the pressure of the power oil, and the space size (i.e., volume size) of the first medium chamber 1112 and the second medium chamber 1212 is changed, so that the fluid medium flows into or flows out of the medium chambers.

Specifically, as shown in fig. 2, a first medium oil port 1114 is formed on a side wall of the first medium chamber 1112 and is connected with an oil port of the logic valve assembly 3 through a pipeline; a first power oil port 1113 is formed in the side wall of the first power oil cavity 1111 and is communicated with an external power oil pipeline (such as an X pipeline) through a pipeline; a second medium oil port 1214 is formed in the side wall of the second medium cavity 1212 and is connected with the other oil port of the logic valve assembly 3 through a pipeline; the side wall of the second power oil cavity 1211 is provided with a second power oil port 1213, and is communicated with another external power oil pipeline (such as a Y pipeline) through a pipeline.

When the X line is supplied with oil, the Y line is in an oil return state where the oil pressure of the first power oil chamber 1111 is greater than the oil pressure in the second power oil chamber 1211, and the piston mechanism 2 as a whole moves toward the first piston chamber 111, as in the example of fig. 2. At this time, the volume of the first medium chamber 1112 is reduced, and the fluid medium therein flows through the first medium port 1114 to the logic valve assembly 3 and flows through the logic valve assembly 3 to the downstream line of the external medium line, and at the same time, the volume of the second medium chamber 1212 is increased and negative pressure is generated, and the fluid medium in the upstream line of the external medium line is sucked into the second medium chamber 1212 through the logic valve assembly 3, so that the fluid medium in the external medium line flows from the upstream line to the downstream line.

When the Y line is supplied with oil, the X line is in an oil return state in which the oil pressure of the first power oil chamber 1111 is smaller than the oil pressure in the second power oil chamber 1211, and the piston mechanism 2 as a whole moves toward the second piston chamber 121, as in the example of fig. 3. At this time, the volume of the first medium chamber 1112 increases and negative pressure is generated, the fluid medium in the upstream line of the external medium line is sucked into the first medium chamber 1112 through the logic valve assembly 3, and at the same time, the volume of the second medium chamber 1212 decreases, wherein the fluid medium flows to the logic valve assembly 3 through the second medium port 1214 and flows to the downstream line of the external medium line through the logic valve assembly 3, so that the fluid medium in the external medium line flows from the upstream line to the downstream line.

In this embodiment, no matter when the piston mechanism 2 moves towards the first piston cavity 111 or moves towards the second piston cavity 121, fluid medium in an upstream pipeline of the external medium pipeline can flow towards a downstream pipeline through the logic valve assembly 3, so that continuous unidirectional pumping operation of the fluid medium can be realized.

Further, as shown in fig. 2 and 3, the first medium chamber 1112 is located at an end of the first piston chamber 111 away from the piston rod 21 (i.e., a rodless chamber), and correspondingly, an end of the first piston chamber 111 near the piston rod 21 (i.e., a rod-containing chamber) is the first power oil chamber 1111. Similarly, the second medium chamber 1212 is located at the end of the second piston chamber 121 remote from the piston rod 21 (i.e., the rodless chamber), and correspondingly, the end of the first piston chamber 111 near the piston rod 21 (i.e., the rod-containing chamber) is the second power oil chamber 1211. It will be appreciated that the piston rod 21 occupies a certain space when moving in the first piston chamber 111 and the second piston chamber 121, and by the above arrangement, the effective volumes of the first medium chamber 1112 and the second medium chamber 1212 can be increased, the pumping amount of the fluid medium in a single stroke can be increased, and the working efficiency can be improved.

In a further embodiment of the present invention, as shown in fig. 1 to 3, the logic valve assembly 3 includes a first flow path 31 and a second flow path 32 arranged in parallel. As illustrated in fig. 2, one end of the first flow path 31 communicates with the first medium chamber 1112, the other end communicates with the second medium chamber 1212, and both ends of the first flow path 31 are connected to the first medium port 1114 and the second medium port 1214, respectively; a first control valve 312 and a medium inlet 311 are provided in the first flow path 31, the medium inlet 311 is used for connecting an upstream pipeline of an external medium pipeline, the first control valve 312 is used for controlling the fluid medium flowing into the medium inlet 311, so that the fluid medium can flow unidirectionally from the medium inlet 311 to the first medium cavity 1112 or the second medium cavity 1212, and the fluid medium in the first medium cavity 1112 and the second medium cavity 1212 cannot flow to the medium inlet 311. As illustrated in fig. 2, one end of the second flow path 32 is connected to one end of the first flow path 31 connected to the first medium chamber 1112, and the other end of the second flow path 32 is connected to one end of the first flow path 31 connected to the second medium chamber 1212 so as to be arranged in parallel with the first flow path 31; the second flow path 32 is provided with a second control valve 322 and a medium outlet 321, the medium outlet 321 is used for connecting a downstream pipeline of an external medium pipeline, the second control valve 322 is used for controlling the fluid medium in the second flow path 32, so that the fluid medium can flow outwards from the medium outlet 321, the external fluid medium cannot flow into the second flow path 32 through the medium outlet 321, meanwhile, the fluid medium at any end of the second flow path 32 cannot flow towards the other end of the second flow path 32 beyond the medium outlet 321, namely, the second control valve 322 can control the fluid medium in the second flow path 32 to flow unidirectionally towards the medium outlet 321.

Further, as shown in fig. 2 and 3, in the logic valve assembly 3, the first control valve 312 includes a first check valve 3121 and a second check valve 3122, and the first check valve 3121 and the second check valve 3122 are respectively disposed at two sides of the medium inlet 311 in the first flow path 31, that is, the first check valve 3121 is disposed at one side of the first flow path 31 where the medium inlet 311 is connected to the first medium cavity 1112, the second check valve 3122 is disposed at one side of the first flow path 31 where the medium inlet 311 is connected to the second medium cavity 1212, and both the oil inlet of the first check valve 3121 and the oil inlet of the second check valve 3122 face the medium inlet 311. After the fluid medium in the external medium oil path enters the first flow path 31 through the medium inlet 311, the fluid medium can flow to the first medium cavity 1112 through the first check valve 3121 or flow to the second medium cavity 1212 through the second check valve 3122, and the fluid medium in the first medium cavity 1112 cannot flow to the medium inlet 311 through the first check valve 3121, and the fluid medium in the second medium cavity 1212 cannot flow to the mechanism inlet through the second check valve 3122.

Further, as shown in fig. 2 and 3, in one specific implementation of the logic valve assembly 3, the second control valve 322 includes a third check valve 3221 and a fourth check valve 3222, where the third check valve 3221 and the fourth check valve 3222 are respectively disposed on two sides of the medium outlet 321, that is, the third check valve 3221 is disposed on a side of the second flow path 32 where the medium outlet 321 is connected to the first medium cavity 1112, the fourth check valve 3222 is disposed on a side of the second flow path 32 where the medium outlet 321 is connected to the second medium cavity 1212, and both an oil inlet of the third check valve 3221 and an oil inlet of the fourth check valve 3222 face away from the medium outlet 321. After the fluid medium in the first medium chamber 1112 enters the second flow path 32, the fluid medium can flow to the medium outlet 321 through the third one-way valve 3221 and flow out of the medium outlet 321, but cannot flow reversely; after the fluid medium in the second medium chamber 1212 enters the second flow path 32, the fluid medium can flow to the medium outlet 321 through the fourth check valve 3222 and flow out of the medium outlet 321, but cannot flow reversely.

As illustrated in fig. 2, when the piston mechanism 2 as a whole moves toward the first piston chamber 111, the volume of the first medium chamber 1112 is reduced, and the fluid medium in the first medium chamber 1112 enters the second flow path 32 through the first flow path 31 and flows to the downstream line of the external medium line through the third check valve 3221, the medium outlet 321; at the same time, the second medium chamber 1212 increases in volume and creates a negative pressure such that the fluid medium in the upstream line of the external medium line flows into the first flow path 31 through the medium inlet 311 and then into the second medium chamber 1212 through the second one-way valve 3122.

As illustrated in fig. 3, when the piston mechanism 2 moves integrally toward the second piston chamber 121, the second medium chamber 1212 is reduced in volume, and the fluid medium therein flows out from the second medium port 1214, flows into the second flow path 32 through the first flow path 31, and then flows to the downstream line of the external medium line through the fourth check valve 3222, the medium outlet 321; at the same time, the first medium chamber 1112 increases in volume and creates a negative pressure such that the fluid medium in the upstream line of the external medium line flows from the medium inlet 311 into the first flow path 31 and then flows into the first medium chamber 1112 through the first one-way valve 3121.

Through the cyclic reciprocating motion of the piston mechanism 2, the fluid medium in the external medium pipeline continuously flows from the upstream pipeline to the downstream pipeline, and continuous pumping operation of the fluid medium is realized.

Further, as shown in fig. 4, in another specific implementation of the logic valve assembly 3, the second control valve 322 may also take the form of a shuttle valve 3223. Specifically, the shuttle valve 3223 includes two oil inlets and one oil outlet, wherein the medium outlet 321 is disposed at the oil outlet of the shuttle valve 3223, one oil inlet of the shuttle valve 3223 is connected to one side of the second flow path 32 to which the first medium chamber 1112 is connected, and the other oil inlet of the shuttle valve 3223 is connected to one side of the second flow path 32 to which the second medium chamber 1212 is connected, such that the two oil inlets are located at both sides of the medium outlet 321, respectively. According to the working principle of the shuttle valve 3223, only one oil inlet is communicated with the oil outlet, and the conducting or closing state of the two oil inlets is specifically determined by the pressure difference between two ends of the shuttle valve 3223, so that the effect that the fluid medium in the first medium cavity 1112 or the second medium cavity 1212 flows unidirectionally to the medium outlet 321 can be achieved.

Specifically, when the piston mechanism 2 moves integrally toward the second piston chamber 121, as in the example of fig. 4, the second medium chamber 1212 is reduced in volume, and the fluid medium flows out through the second medium port 1214 and flows to the right end of the shuttle valve 3223 of the second flow path 32 through the first flow path 31, and the spool of the shuttle valve 3223 moves left under pressure, so that the right oil inlet of the shuttle valve 3223 communicates with the oil outlet, and the fluid medium flows to the downstream line of the external medium line through the shuttle valve 3223 and the medium outlet 321; in the process, the volume of the first medium chamber 1112 increases and a negative pressure is generated, so that the fluid medium in the upstream line of the external medium line flows into the first medium chamber 1112 through the medium inlet 311 and the first check valve 3121. Conversely, when the piston mechanism 2 moves integrally toward the first piston chamber 111, the volume of the first medium chamber 1112 is reduced, and the fluid medium therein flows out from the first medium port 1114 and flows from the first flow path 31 to the left end of the shuttle valve 3223 in the second flow path 32, and the spool of the shuttle valve 3223 moves rightward under pressure, so that the left oil inlet and the oil outlet of the shuttle valve 3223 are communicated, and the fluid medium flows through the shuttle valve 3223 and the medium outlet 321 to the downstream pipeline of the external medium pipeline; at the same time, the second medium chamber 1212 increases in volume and creates a negative pressure such that fluid medium in the upstream line of the external medium line flows into the second medium chamber 1212 through the medium inlet 311 and the second one-way valve 3122.

In a further embodiment of the present invention, as shown in fig. 1 and 5, in the hydraulic pumping device 100, the piston cylinder 1 includes a split first cylinder body 11 and a split second cylinder body 12, and the first cylinder body 11 and the second cylinder body 12 are detachably connected to form a whole (e.g., bolted connection) of the piston cylinder 1, so as to facilitate disassembly and assembly. The first piston cavity 111 is located in the first cylinder 11, the second piston cavity 121 is located in the second cylinder 12, the end faces of the opposite ends of the first cylinder 11 and the second cylinder 12 are all provided with piston holes 13, and the piston rod 21 of the piston mechanism 2 is inserted into the piston holes 13 and can move along the axial direction to drive the first piston body 22 and the second piston body 23 to perform linear reciprocating motion.

The first cylinder 11 and the second cylinder 12 may be directly connected to each other, or may be indirectly connected to each other by other structures according to the assembly requirements.

Further, as in the example of fig. 5, the piston cylinder 1 also comprises a connecting sleeve 14. The connecting sleeve 14 is disposed between the first cylinder 11 and the second cylinder 12, and both ends of the connecting sleeve 14 in the axial direction are detachably connected (e.g., by bolting) with the first cylinder 11 and the second cylinder 12, respectively, to achieve indirect connection of the first cylinder 11 and the second cylinder 12. The piston rod 21 is arranged in the first cylinder body 11, the connecting sleeve 14 and the second cylinder body 12 in a penetrating way, so that the length of the piston cylinder 1 in the axial direction is increased through the connecting sleeve 14, the piston rod is matched with the structure of the piston mechanism 2, the stroke of the piston mechanism 2 is increased, and the pumping efficiency is improved. Wherein one or more connecting sleeves 14 may be provided, depending on the actual size.

Further, as shown in fig. 5, the piston rod 21 of the piston mechanism 2 may also adopt a split type structure, that is, the piston rod 21 includes a plurality of coaxially arranged sub-piston rods 211, and any two adjacent sub-piston rods 211 are connected by a coupling 212, so as to facilitate disassembly and assembly. The coupling 212 may specifically be a piston rod connecting sleeve, and the two sub piston rods 211 are sleeved into an integral structure; the number of sub-piston rods 211 may be set according to specific size requirements.

Further, as shown in fig. 5, a seal is also provided in the hydraulic pumping device 100. Specifically, a first annular groove 221 is formed on a side wall surface of the first piston body 22, a first sealing ring 222 is arranged in the first annular groove 221, and sealing between the first medium chamber 1112 and the first power oil chamber 1111 is achieved through adhesion between the first sealing ring 222 and an inner side wall of the first piston chamber 111. Similarly, a second annular groove 231 is formed in the side wall surface of the second piston body 23, and a second sealing ring 232 is arranged in the second annular groove 231, and sealing between the second medium cavity 1212 and the second power oil cavity 1211 is achieved through the fit of the second sealing ring 232 and the inner side wall of the second piston cavity 121.

In addition, third annular grooves 131 are formed in the inner side wall of the piston hole 13 of the first cylinder body 11 and the inner side wall of the second cylinder body 12, a third sealing ring 132 is arranged in each third annular groove 131, the third sealing ring 132 is sleeved on the piston rod 21, and sealing between the piston hole 13 and the piston rod 21 is achieved through the lamination of the third sealing ring 132 and the outer side surface of the piston rod 21.

By providing the first seal ring 222, the second seal ring 232 and the third seal ring 132, the sealing performance between the piston cylinder 1 and the piston mechanism 2 can be effectively improved.

In a further embodiment of the present invention, as shown in fig. 6, the hydraulic pumping device 100 further includes a main pump body 4, and the piston cylinder 1 and the logic valve assembly 3 are disposed in the main pump body 4, thereby realizing an integrated design of the hydraulic pumping device 100. The piston cylinder 1 and the main pump body 4 may be integrally formed, that is, the structure in which the piston cylinder 1 is directly machined in the main pump body 4, and of course, the piston cylinder 1 and the main pump body 4 may be separately formed. The piping, flow path, etc. of the hydraulic pumping device 100 may be piping directly processed in the main pump body 4, or may be solid piping.

It should be noted that the foregoing is only a preferred implementation, and the hydraulic pumping device 100 in the present invention is not limited to the above-described integrated structure, and may also adopt a structure in which the piston cylinder 1 and the logic valve assembly 3 are separately provided, and the effect of the hydraulic pumping device 100 is not affected.

The following is one specific embodiment of the hydraulic pumping device 100 of the present invention:

as shown in fig. 1, 2 and 5, the hydraulic pumping device 100 includes a piston cylinder 1, a piston mechanism 2, and a logic valve assembly 3.

As shown in fig. 5, the piston cylinder 1 includes a split-type first cylinder body 11, a second cylinder body 12, and a connecting sleeve 14, the connecting sleeve 14 being provided between the first cylinder body 11 and the second cylinder body 12, and both axial ends of the connecting sleeve 14 being connected with the first cylinder body 11 and the second cylinder body 12 by bolts, respectively, to form the piston cylinder 1 as a whole. The first cylinder 11 has a first piston cavity 111 formed therein, the second cylinder 12 has a second piston cavity 121 formed therein, and the end surfaces of the opposite ends of the first cylinder 11 and the second cylinder 12 are provided with coaxially disposed piston holes 13. The connecting cavity formed in the communicating sleeve is a closed cavity.

As shown in fig. 2 and 5, the piston mechanism 2 includes a piston rod 21 and first and

second piston bodies

22 and 23. The piston rod 21 is arranged along the axial direction of the piston cylinder 1 and penetrates into the piston holes 13 of the first cylinder body 11 and the second cylinder body 12; the first piston body 22 is connected to one end of the piston cylinder 1 and is located in the first piston chamber 111, and the second piston body 23 is connected to the other end of the piston rod 21 and is located in the second piston chamber 121, forming a piston mechanism 2 of the double piston type. The piston rod 21 includes two sub-piston rods 211 coaxially arranged, and the two sub-piston rods 211 are connected by a coupling 212. The first piston chamber 111 is divided by the first piston body 22 into a first power oil chamber 1111 and a first medium chamber 1112, and the second piston chamber 121 is divided by the second piston body 23 into a second power oil chamber 1211 and a second medium chamber 1212; a first medium oil port 1114 is formed in the side wall of the first medium cavity 1112, and a second medium oil port 1214 is formed in the side wall of the second medium cavity 1212; the side wall of the first power oil cavity 1111 is provided with a first power oil port 1113, the side wall of the second power oil cavity 1211 is provided with a second power oil port 1213, the first power oil port 1113 is connected with an X pipeline of an external power oil pipeline when in use, and the second power oil port 1213 is connected with a Y pipeline of the external power oil pipeline.

As shown in fig. 2 and 3, the first medium chamber 1112 is located at an end of the first piston chamber 111 away from the piston rod 21 (i.e., a rodless chamber), and correspondingly, an end of the first piston chamber 111 near the piston rod 21 (i.e., a rod-containing chamber) is the first power oil chamber 1111. Similarly, the second medium chamber 1212 is located at the end of the second piston chamber 121 remote from the piston rod 21 (i.e., the rodless chamber), and correspondingly, the end of the first piston chamber 111 near the piston rod 21 (i.e., the rod-containing chamber) is the second power oil chamber 1211. Through the arrangement mode, the effective volumes of the first medium oil cavity and the second medium oil cavity can be increased, and the pumping efficiency is improved.

As shown in fig. 5, a first annular groove 221 is formed in the side wall surface of the first piston body 22, a first sealing ring 222 is arranged in the first annular groove 221, and the sealing between the first medium chamber 1112 and the first power oil chamber 1111 is realized by the adhesion of the first sealing ring 222 and the inner side wall of the first piston chamber 111. Similarly, a second annular groove 231 is formed in the side wall surface of the second piston body 23, and a second sealing ring 232 is arranged in the second annular groove 231, and the second medium cavity 1212 and the second power oil cavity 1211 are hermetically separated by the second sealing ring 232 being attached to the inner side wall of the second piston cavity 121. Third annular grooves 131 are formed in the inner side wall of the piston hole 13 of the first cylinder body 11 and the inner side wall of the second cylinder body 12, third sealing rings 132 are arranged in each third annular groove 131, the third sealing rings 132 are sleeved on the piston rod 21, and the sealing between the piston hole 13 and the piston rod 21 is achieved through the lamination of the third sealing rings 132 and the outer side face of the piston rod 21.

As shown in fig. 1 to 3, the logic valve assembly 3 includes a first flow path 31 and a second flow path 32 arranged in parallel. As illustrated in fig. 2, one end of the first flow path 31 communicates with the first medium chamber 1112, the other end communicates with the second medium chamber 1212, and both ends of the first flow path 31 are connected to the first medium port 1114 and the second medium port 1214, respectively; the first flow path 31 is provided with a first control valve 312 and a medium inlet 311, the medium inlet 311 is used for connecting an upstream pipeline of an external medium pipeline, and the first control valve 312 is used for controlling the fluid medium flowing into the medium inlet 311 so that the fluid medium can flow into the first medium cavity 1112 or the second medium cavity 1212 unidirectionally from the medium inlet 311. One end of the second flow path 32 is connected to one end of the first flow path 31 connected to the first medium chamber 1112, and the other end of the second flow path 32 is connected to one end of the first flow path 31 connected to the second medium chamber 1212, so as to form a parallel arrangement with the first flow path 31; the second flow path 32 is provided with a second control valve 322 and a medium outlet 321, the medium outlet 321 is used for connecting a downstream pipeline of an external medium pipeline, and the second control valve 322 is used for controlling the fluid medium in the second flow path 32 so as to enable the fluid medium in the second flow path 32 to flow unidirectionally to the medium outlet 321.

Specifically, as shown in fig. 2 and 3, the first control valve 312 includes a first check valve 3121 and a second check valve 3122, where the first check valve 3121 and the second check valve 3122 are respectively disposed at two sides of the medium inlet 311 in the first flow path 31, that is, the first check valve 3121 is disposed at one side of the first flow path 31 where the medium inlet 311 is connected to the first medium cavity 1112, the second check valve 3122 is disposed at one side of the first flow path 31 where the medium inlet 311 is connected to the second medium cavity 1212, and both the oil inlet of the first check valve 3121 and the oil inlet of the second check valve 3122 face the medium inlet 311. As shown in fig. 2 and 3, the second control valve 322 includes a third check valve 3221 and a fourth check valve 3222, where the third check valve 3221 and the fourth check valve 3222 are respectively disposed on two sides of the medium outlet 321, that is, the third check valve 3221 is disposed on one side of the second flow path 32 where the medium outlet 321 is connected to the first medium cavity 1112, the fourth check valve 3222 is disposed on one side of the second flow path 32 where the medium outlet 321 is connected to the second medium cavity 1212, and both an oil inlet of the third check valve 3221 and an oil inlet of the fourth check valve 3222 face away from the medium outlet 321.

In a specific application, as illustrated in fig. 2, when the oil is supplied to the X pipe, the Y pipe is in an oil return state, and at this time, the oil pressure in the first power oil chamber 1111 is greater than the oil pressure in the second power oil chamber 1211, the piston mechanism 2 moves toward the first piston chamber 111 as a whole, the volume of the first medium chamber 1112 is reduced, the fluid medium in the first medium chamber 1112 enters the second flow path 32 through the first flow path 31, and flows to the downstream pipe of the external medium pipe through the third check valve 3221 and the medium outlet 321; at the same time, the second medium chamber 1212 increases in volume and creates a negative pressure such that the fluid medium in the upstream line of the external medium line flows into the first flow path 31 through the medium inlet 311 and then into the second medium chamber 1212 through the second one-way valve 3122.

As shown in the example of fig. 3, when the Y pipe is supplied with oil, the X pipe is in an oil return state, at this time, the oil pressure in the second power oil chamber 1211 is greater than the oil pressure in the second power oil chamber 1211, the whole piston mechanism 2 moves toward the second piston chamber 121, the volume of the second medium chamber 1212 is reduced, and the fluid medium therein flows out from the second medium port 1214, flows into the second flow path 32 through the first flow path 31, and then flows to the downstream pipe of the external medium pipe through the fourth check valve 3222 and the medium outlet 321; at the same time, the first medium chamber 1112 increases in volume and creates a negative pressure such that the fluid medium in the upstream line of the external medium line flows from the medium inlet 311 into the first flow path 31 and then flows into the first medium chamber 1112 through the first one-way valve 3121.

Through the cyclic reciprocating motion of the piston mechanism 2, the fluid medium in the external medium pipeline continuously flows from the upstream pipeline to the downstream pipeline, and the unidirectional pumping operation of the fluid medium is realized. Wherein, no matter the piston mechanism 2 moves towards the first piston cavity 111 or moves towards the second piston cavity 121, the fluid medium in the external medium pipeline can be driven to flow, so that continuous pumping operation is realized.

Further, as shown in fig. 6, the hydraulic pumping device 100 may further include a main pump body 4, the piston cylinder 1 and the logic valve assembly 3 are disposed in the main pump body 4, and the piston cylinder 1 and the main pump body 4 adopt an integral structure, so as to implement an integrated design of the hydraulic pumping device 100.

In the second aspect of the present invention, as shown in fig. 1 and 7, a construction machine 200 is provided, where the construction machine 200 includes the hydraulic pumping device 100 according to any one of the first aspect, and the hydraulic pumping device 100 is used for pumping a fluid medium, so that the construction machine can be applied to construction scenes such as underwater or mud, and is suitable for deep-diving conditions.

Further, the construction machine 200 may further include a power oil supply device, a fluid medium line, etc. that are matched with the hydraulic pumping device 100 according to actual use requirements.

It should be noted that, according to the use requirement, the engineering machine 200 in this embodiment may be specifically configured as a pile driver, and may of course be other types of mechanical devices.

In addition, the construction machine 200 of the present embodiment should also have all the advantages of the hydraulic pumping device 100 of any one of the embodiments of the first aspect, which is not described herein.

The basic principles of the present invention have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be considered as essential to the various embodiments of the present invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.

The block diagrams of the devices, apparatuses, devices, systems referred to in the present invention are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to. It should also be noted that in the apparatus and device of the present invention, the components may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features herein.

The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as presently claimed, and is intended to cover all modifications, alternatives, and equivalents falling within the spirit and scope of the invention.

Claims

1. A hydraulic pumping device, comprising:

a piston cylinder (1);

the piston mechanism (2) is arranged in the piston cylinder (1), the piston mechanism (2) divides the inner space of the piston cylinder (1) into a plurality of power oil cavities and a plurality of medium cavities, the power oil cavities are suitable for being communicated with an external power oil pipeline, and the piston mechanism (2) can perform linear reciprocating motion under the pressure action of power oil;

a logic valve assembly (3) which is communicated with a plurality of medium cavities through pipelines and is suitable for being connected with an external medium pipeline, wherein the logic valve assembly (3) can enable fluid medium in the external medium pipeline to flow unidirectionally and continuously under the action of the piston mechanism (2).

2. The hydraulic pumping device of claim 1, wherein,

a first piston cavity (111) and a second piston cavity (121) are arranged in the piston cylinder (1);

the piston mechanism (2) comprises a piston rod (21), a first piston body (22) and a second piston body (23);

the first piston body (22) is connected to one end of the piston rod (21), and the first piston body (22) is located in the first piston cavity (111) and divides the first piston cavity (111) into a first power oil cavity (1111) and a first medium cavity (1112) which are independent of each other;

the second piston body (23) is connected to the other end of the piston rod (21), and the second piston body (23) is located in the second piston cavity (121) and divides the second piston cavity (121) into a second power oil cavity (1211) and a second medium cavity (1212) which are independent of each other.

3. The hydraulic pumping device of claim 2, wherein,

-said first medium chamber (1112) is located at an end of said first piston chamber (111) remote from said piston rod (21);

the second medium chamber (1212) is located in the second piston chamber (121) at an end remote from the piston rod (21).

4. Hydraulic pumping device according to claim 2, characterized in that the logic valve assembly (3) comprises:

A first flow path (31), one end of which is communicated with the first medium cavity (1112) and the other end of which is communicated with the second medium cavity (1212), wherein a first control valve (312) and a medium inlet (311) are arranged in the first flow path (31), the medium inlet (311) is suitable for being connected with an external medium pipeline, and the first control valve (312) is used for controlling the fluid medium in the first flow path (31) to flow from the medium inlet (311) to the first medium cavity (1112) or the second medium cavity (1212) in one direction only;

the second flow path (32) is arranged in parallel with the first flow path (31), one end of the second flow path (32) is connected to one end of the first flow path (31) connected with the first medium cavity (1112), the other end of the second flow path (32) is connected to one end of the first flow path (31) connected with the second medium cavity (1212), a second control valve (322) and a medium outlet (321) are arranged in the second flow path (32), and the second control valve (322) is used for controlling fluid medium in the second flow path (32) to flow unidirectionally to the medium outlet (321).

5. The hydraulic pumping device of claim 4, wherein the first control valve (312) comprises:

the first one-way valve (3121) is arranged in the first flow path (31), the medium inlet (311) is connected with one side of the first medium cavity (1112), and the oil inlet of the first one-way valve (3121) faces to the medium inlet (311);

The second one-way valve (3122) is arranged in the first flow path (31), the medium inlet (311) is connected with one side of the second medium cavity (1212), and the oil inlet of the second one-way valve (3122) faces to the medium inlet (311).

6. The hydraulic pumping device of claim 4, wherein the second control valve (322) comprises:

the third one-way valve (3221) is arranged in the second flow path (32), the medium outlet (321) is connected with one side of the first medium cavity (1112), and an oil inlet of the third one-way valve (3221) is opposite to the medium outlet (321);

and the fourth one-way valve (3222) is arranged in the second flow path (32) and is connected with one side of the second medium cavity (1212), and an oil inlet of the fourth one-way valve (3222) is opposite to the medium outlet (321).

7. The hydraulic pumping device of claim 4, wherein the second control valve (322) comprises:

the medium outlet (321) is arranged at the oil outlet of the shuttle valve (3223), one oil inlet of the shuttle valve (3223) is connected to one side of the second flow path (32) connected with the first medium cavity (1112), and the other oil inlet of the shuttle valve (3223) is connected to one side of the second flow path (32) connected with the second medium cavity (1212).

8. The hydraulic pumping device of claim 2, wherein,

the piston cylinder (1) comprises a first cylinder body (11) and a second cylinder body (12) which are detachably connected, the first piston cavity (111) is positioned in the first cylinder body (11), and the second piston cavity (121) is positioned in the second cylinder body (12);

the piston rod (21) is arranged in the piston hole (13) in a penetrating mode, and piston holes (13) are formed in the end faces of one ends, opposite to each other, of the first cylinder body (11) and the second cylinder body (12).

9. The hydraulic pumping device of any one of claims 1 to 8, further comprising:

the piston cylinder (1) and the logic valve assembly (3) are both arranged in the main pump body (4).

10. A construction machine, comprising:

the hydraulic pumping device of any one of claims 1 to 9.