CN112460013B

CN112460013B - Hydraulic plunger pump and hydraulic end thereof

Info

Publication number: CN112460013B
Application number: CN201910841989.1A
Authority: CN
Inventors: 谢伟; 施建国; 张耀华; 高宏; 刘信党; 刘强
Original assignee: DOWNHOLE SPECIAL OPERATION Co OF SINOPEC ZHONGYUAN ENGINEERING Ltd; Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: DOWNHOLE SPECIAL OPERATION Co OF SINOPEC ZHONGYUAN ENGINEERING Ltd; Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2023-04-18
Anticipated expiration: 2039-09-06
Also published as: CN112460013A

Abstract

The application discloses hydraulic pressure plunger pump and hydraulic end thereof, wherein, hydraulic end includes the hydraulic end body, still includes: and the driving end of the one-way valve driving device is in driving connection with the suction one-way valve of the hydraulic end body and is used for driving the suction one-way valve to be opened in a suction stroke and driving the suction one-way valve to be closed in a discharge stroke. When compressible foam liquid is pumped, the passive opening and closing of the suction one-way valve are realized by changing the pressure of the valve cavity of the liquid end body through the movement of the plunger of the liquid end body, but the active opening and closing of the suction one-way valve are assisted through the one-way valve driving device, so that the phenomenon that the suction one-way valve cannot be normally opened and closed due to expansion and compression of the foam liquid is avoided, and the normal pumping of the liquid end is ensured.

Description

Hydraulic plunger pump and hydraulic end thereof

Technical Field

The invention relates to the technical field of plunger pumps, in particular to a hydraulic end of a hydraulic plunger pump. The invention also relates to a hydraulic plunger pump comprising the hydraulic end.

Background

The plunger pump mainly comprises a power end and a hydraulic end, wherein the power end mainly converts the rotary motion of a driving shaft into the reciprocating motion of a plunger, and the hydraulic end connected with the plunger mainly realizes the periodic change of the volume of an inner cavity of the hydraulic end by the reciprocating motion of the plunger and the alternate opening and closing of a suction one-way valve and a discharge one-way valve.

The existing hydraulic end mainly comprises a valve box, a one-way valve, a plunger and the like. The valve housing is provided with a suction hole, a discharge hole, a plunger hole, etc., a suction check valve is installed in the suction hole to allow only fluid to enter the valve housing, and a discharge check valve is installed in the discharge hole to allow only fluid to be discharged from the valve housing. In the suction stroke, the plunger moves towards the power end, the pressure in the inner cavity of the valve box is rapidly reduced, the discharge check valve is closed, the suction check valve is opened, and the liquid is rapidly introduced into the inner cavity of the valve box due to the pressure difference between the inside and the outside of the suction check valve; in the exhaust stroke, the plunger moves into the internal chamber, the intake check valve closes, and the pressure of the fluid in the valve housing gradually increases until the exhaust check valve opens to pump the fluid into the exhaust port. At present, a common plunger pump can only inject pure liquid, and under certain working conditions, when foam liquid mixed with gas needs to be injected sometimes, particularly when the specific gravity of the foam liquid is controlled below 0.85, the air in the foam liquid is easy to compress and expand, so that the pumping force of the plunger pump is insufficient, a suction one-way valve cannot be normally opened and closed, the foam liquid cannot be effectively filled and discharged in an inner cavity of a valve box, and finally the pump injection is disabled.

In summary, how to solve the problem that the suction check valve cannot be normally opened and closed when the hydraulic end of the hydraulic plunger pump injects the compressible foam liquid to cause pump injection failure becomes a problem to be urgently solved by the technical staff in the field.

Disclosure of Invention

In view of the above, the present invention aims to provide a hydraulic end device of a hydraulic plunger pump, so as to ensure the normal opening and closing of a suction check valve when the pump is filled with compressible foam liquid.

It is another object of the present invention to provide a hydraulic plunger pump incorporating the fluid end assembly to ensure proper opening and closing of the suction check valve when pumping compressible foam fluid.

In order to achieve the purpose, the invention provides the following technical scheme:

a hydraulic end of a hydraulic plunger pump, comprising a hydraulic end body, further comprising: and the driving end of the one-way valve driving device is in driving connection with the suction one-way valve of the hydraulic end body and is used for driving the suction one-way valve to be opened in a suction stroke and driving the suction one-way valve to be closed in a discharge stroke.

Preferably, in the above-described fluid end, the check valve driving device includes:

the hydraulic cylinder is provided with a first hydraulic hole and a second hydraulic hole, the first hydraulic hole is communicated with the first cavity, and the second hydraulic hole is communicated with the second cavity;

the reversing valve is provided with a valve core, an oil inlet, an oil return port, a first oil port and a second oil port, the first oil port is communicated with the first hydraulic hole, the second oil port is communicated with the second hydraulic hole, and the first oil port and the second oil port alternately perform oil inlet and oil return along with the periodic change of the suction stroke and the discharge stroke through the action of the valve core;

and the hydraulic source is communicated with the oil inlet and the oil return port and is used for supplying and recovering fluid.

Preferably, in the above-mentioned fluid end, the direction valve is a rotary direction valve, and the rotary direction valve includes:

the cylinder wall of the valve cylinder is provided with the first oil port, the second oil port, the oil inlet and the oil return port, and the first oil port and the second oil port are respectively arranged on two semi-circumferential sides of the circumferential cylinder wall of the valve cylinder;

the valve element is a cylindrical valve element, the cylindrical valve element is rotatably arranged in the valve cylinder, the outer peripheral surface of the cylindrical valve element is in sealed rotation fit with the inner wall of the valve cylinder, the cylindrical valve element is synchronously linked with the plunger of the hydraulic end body, the plunger completes one stroke cycle, the cylindrical valve element rotates for one circle, the outer peripheral surface of the cylindrical valve element is provided with a first flow through groove, a second flow through groove, an annular oil inlet groove and an annular oil return groove which are mutually isolated, the cylindrical valve element is provided with a first axial channel and a second axial channel, the annular oil inlet groove and the first flow through groove are communicated with the first axial channel, the annular oil return groove and the second flow through groove are communicated with the second axial channel, the annular oil inlet groove is communicated with the oil inlet, the annular oil return groove is communicated with the oil return port, the first flow through groove and the second flow through groove are respectively arranged on two half peripheral sides of the outer peripheral surface of the cylindrical valve element, and the first flow through groove and the second flow through groove are alternately communicated with the first oil port and the second oil port along with the rotation of the cylindrical valve element.

Preferably, in the hydraulic terminal, the first flow groove and the second flow groove are both arc-shaped grooves, and the circumferential angle of the arc-shaped grooves is less than 180 degrees.

Preferably, in the hydraulic end, a connecting disc is fixed to one end of the cylindrical valve core, and the connecting disc and the plunger are linked through a crankshaft.

Preferably, in the above hydraulic end, the number of the first oil ports, the number of the second oil ports, the number of the first circulation grooves and the number of the second circulation grooves are the same and are one or more, and the plurality of first circulation grooves and the plurality of second circulation grooves are distributed along the axial direction of the cylindrical valve core; the first hydraulic hole and the second hydraulic hole of one hydraulic cylinder are respectively and correspondingly communicated with the first oil port and the second oil port.

Preferably, in the above-mentioned hydraulic end, sealing rings are disposed between every two adjacent first circulation grooves, between every two adjacent second circulation grooves, and between the annular oil inlet groove and the annular oil return groove.

Preferably, in the above-mentioned hydraulic end, the suction hole of the hydraulic end body is provided with a centering ring sleeved on the hydraulic rod.

Preferably, in the above-mentioned hydraulic end, an elastic restoring member is mounted on the hydraulic rod, and two ends of the elastic restoring member respectively and elastically act on the hydraulic rod and the valve box of the hydraulic end body.

The invention also provides a hydraulic plunger pump, which comprises a hydraulic end, wherein the hydraulic end is the hydraulic end as described in any one of the above.

Compared with the prior art, the invention has the beneficial effects that:

the hydraulic end of the hydraulic plunger pump provided by the invention comprises a hydraulic end body and a one-way valve driving device, wherein the driving end of the one-way valve driving device is in driving connection with a suction one-way valve of the hydraulic end body and is used for driving the suction one-way valve to be opened in the suction stroke of the hydraulic end body and driving the suction one-way valve to be closed in the discharge stroke. When compressible foam liquid is pumped, the passive opening and closing of the suction one-way valve are realized by changing the pressure of the valve cavity of the liquid end body through the movement of the plunger of the liquid end body, but the active opening and closing of the suction one-way valve are assisted through the one-way valve driving device, so that the phenomenon that the suction one-way valve cannot be normally opened and closed due to expansion and compression of the foam liquid is avoided, and the normal pumping of the liquid end is ensured.

The hydraulic plunger pump provided by the invention adopts the hydraulic end in the application, so that the phenomenon that the suction one-way valve cannot be normally opened and closed due to expansion and compression of foam liquid is avoided, and the normal pumping of the hydraulic plunger pump is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a hydraulic end of a hydraulic plunger pump according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a reversing valve of a hydraulic end according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a hydraulic-end reversing valve connected to a plurality of hydraulic cylinders according to an embodiment of the present invention.

Wherein, 1 is a hydraulic end body, 11 is a valve box, 111 is a discharge hole, 112 is a valve cavity, 113 is a suction hole, 12 is a discharge check valve, 13 is a plunger, 14 is a suction check valve, 2 is a hydraulic cylinder, 21 is a cylinder body, 211 is a first hydraulic hole, 212 is a second hydraulic hole, 213 is a first cavity, 214 is a second cavity, 22 is a piston, 23 is a hydraulic rod, 3 is a reversing valve, 31 is a valve cylinder, 311 is a first oil port, 312 is a second oil port, 313 is an oil inlet, 314 is an oil return port, 32 is a cylindrical valve core, 321 is a first axial passage, 322 is a second axial passage, 323 is a first flow through groove, 324 is a second flow through groove, 325 is an annular oil inlet groove, 326 is an annular oil return groove, 33 is a connecting disc, 4 is a hydraulic source, 5 is a centering ring, and 6 is an elastic return piece.

Detailed Description

The core of the invention is to provide a hydraulic end device of a hydraulic plunger pump, which ensures the normal opening and closing of a suction check valve when compressible foam liquid is pumped.

The invention also provides a hydraulic plunger pump comprising the hydraulic end device, which ensures the normal opening and closing of the suction check valve when the pump is filled with compressible foam liquid.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, an embodiment of the present invention provides a hydraulic end of a hydraulic plunger pump, including a hydraulic end body 1 and a check valve driving device, wherein the hydraulic end body 1 includes a valve housing 11, a plunger 13, a suction check valve 14 and a discharge check valve 12, the valve housing 11 is provided with a valve cavity 112, a plunger hole, a suction hole 113 and a discharge hole 111, the plunger 13 is movably disposed in the plunger hole, the suction check valve 14 is disposed in the suction hole 113, the suction check valve 14 is configured to conduct fluid into the valve cavity 112, the discharge check valve 12 is disposed in the discharge hole 111, and the discharge check valve 12 is configured to conduct fluid out of the valve cavity 112.

The driving end of the one-way valve driving device is in driving connection with the suction one-way valve 14 of the hydraulic end body 1, and the driving end of the one-way valve driving device is used for driving the suction one-way valve 14 to be opened in the suction stroke of the hydraulic end body 1 and driving the suction one-way valve 14 to be closed in the discharge stroke.

When the hydraulic end pumps compressible foam liquid, the passive opening and closing of the suction check valve 14 are realized by changing the pressure of the valve cavity 112 of the hydraulic end body 1 not only by means of the movement of the plunger 13 of the hydraulic end body 1 in the suction stroke and the discharge stroke, but also by means of the driving end of the check valve driving device, the suction check valve 14 is driven to be actively opened in the suction stroke and actively closed in the discharge stroke, so that the situation that the suction check valve 14 cannot be normally opened and closed due to expansion and compression of the foam liquid is avoided, and the normal pumping of the hydraulic end is ensured.

As shown in fig. 1, the present embodiment provides a specific check valve driving apparatus including a hydraulic cylinder 2, a directional valve 3, and a hydraulic pressure source 4; the hydraulic cylinder 2 is provided with a hydraulic cavity in a cylinder body 21, a piston 22 is arranged in the hydraulic cavity, the piston 22 divides the hydraulic cavity into a first cavity 213 and a second cavity 214, one end of the piston 22 is connected with a hydraulic rod 23, the hydraulic rod 23 is in driving connection with the suction one-way valve 14, the cylinder body 21 is provided with a first hydraulic hole 211 and a second hydraulic hole 212, the first hydraulic hole 211 is communicated with the first cavity 213, and the second hydraulic hole 212 is communicated with the second cavity 214;

the reversing valve 3 is provided with a valve core, an oil inlet 313, an oil return port 314, a first oil port 311 and a second oil port 312, the first oil port 311 is communicated with the first hydraulic hole 211 through a pipeline, the second oil port 312 is communicated with the second hydraulic hole 212 through a pipeline, and the first oil port 311 and the second oil port 312 alternately perform oil inlet and oil return along with the periodic change of a suction stroke and a discharge stroke through the action of the valve core;

the hydraulic pressure source 4 communicates with the oil inlet 313 and the oil return 314 for supplying hydraulic oil to the directional valve 3 and the hydraulic cylinder 2 and recovering the hydraulic oil.

The working principle of the one-way valve driving device is as follows:

the hydraulic source 4 supplies oil to the oil inlet 313 of the reversing valve 3, and returns the hydraulic oil to the hydraulic source 4 through the oil return port 314 of the reversing valve 3, so that hydraulic oil circulation is formed. In a suction stroke, the valve core moves to enable the first oil port 311 and the oil inlet 313 of the reversing valve 3 to be communicated, the second oil port 312 and the oil return port 314 of the reversing valve 3 to be communicated, the oil inlet passage is that hydraulic oil sequentially passes through the oil outlet of the hydraulic source 4, the oil inlet 313 and the first oil port 311 of the reversing valve 3, the pipeline and the first hydraulic hole 211 of the hydraulic cylinder 2 to enter the first cavity 213, and the oil return passage is that hydraulic oil sequentially passes through the second cavity 214 of the hydraulic cylinder 2, the second hydraulic hole 212, the pipeline, the second oil port 312 of the reversing valve 3 and the oil return port 314 and then returns to the hydraulic source 4. At this time, the piston 22 is pushed by the hydraulic oil to move toward the side of the valve cavity 112 close to the hydraulic end body 1, and further pushes the hydraulic rod 23 to move, the hydraulic rod 23 pushes the suction check valve 14 to move toward the valve cavity 112, and the suction check valve 112 is opened.

In the discharging stroke, the valve core moves to enable the second oil port 312 of the reversing valve 3 to be communicated with the oil inlet 313, the first oil port 311 of the reversing valve 3 to be communicated with the oil return port 314, the oil inlet passage is formed by enabling hydraulic oil to sequentially pass through the oil outlet of the hydraulic source 4, the oil inlet 313 and the second oil port 312 of the reversing valve 3, the pipeline and the second hydraulic hole 212 of the hydraulic cylinder 2 to enter the second cavity 214, and the oil return passage is formed by enabling the hydraulic oil to sequentially pass through the first cavity 213 of the hydraulic cylinder 2, the first hydraulic hole 211, the pipeline, the first oil port 311 of the reversing valve 3 and the oil return port 314 and then return to the hydraulic source 4. At this time, the piston 22 is pushed by the hydraulic oil to move to a side away from the valve cavity 112 of the hydraulic end body 1, so as to push the hydraulic rod 23 to move, the hydraulic rod 23 pushes the suction check valve 14 to move out of the valve cavity 112, and the suction check valve 14 is closed.

Of course, the check valve driving device may drive the suction check valve 14 to open and close by using an electric cylinder, a pneumatic cylinder, or the like, in addition to the hydraulic cylinder 2, the direction change valve 3, and the hydraulic pressure source 4.

As shown in fig. 2, the reversing valve 3 is optimized, in this embodiment, the reversing valve 3 is a rotary reversing valve, and includes a valve cylinder 31 and a cylindrical valve core 32, a first oil port 311, a second oil port 312, an oil inlet 313 and an oil return port 314 are opened on a cylinder wall of the valve cylinder 31, and the first oil port 311 and the second oil port 312 are respectively disposed on two semi-circumferential sides of a circumferential cylinder wall of the valve cylinder 31;

the cylindrical valve core 32 is rotatably arranged in the valve cylinder 31, and is rotatably connected through a bearing, the outer peripheral surface of the cylindrical valve core 32 is in sealed rotating fit with the inner wall of the valve cylinder 31, the cylindrical valve core 32 is synchronously linked with the plunger 13 of the hydraulic end body 1, the plunger 13 completes one stroke cycle, the cylindrical valve core 32 rotates for one circle, the outer peripheral surface of the cylindrical valve core 32 is provided with a first flow through groove 323, a second flow through groove 324, an annular oil inlet groove 325 and an annular oil return groove 326 which are isolated and not communicated with each other, the inner part of the cylindrical valve core 32 is axially provided with a first axial channel 321 and a second axial channel 322 which are isolated and communicated with each other, two ends of the first axial channel 321 and the second axial channel 322 are closed, the annular oil inlet groove 325 and the first flow through groove 323 are communicated with the first axial channel 321 through respective communication holes, the annular oil return groove 326 and the second flow through groove 324 are communicated with the second axial channel 322 through respective communication holes, the annular oil inlet groove 325 is communicated with the oil inlet 313, the annular oil return groove 326 is communicated with the oil return hole 323, the first flow through groove 323 and the second flow through groove 324 are alternately arranged on two half sides of the cylindrical valve core 32, and the outer peripheral surface of the first flow through groove 323 and the second flow through groove 324, and the second flow through groove 312 are communicated with the second flow through groove 324.

The working principle of the rotary reversing valve is as follows:

in the suction stroke, the plunger 13 is pushed out to the outside of the valve chamber 112, and since the spool 32 is interlocked with the plunger 13, the spool 32 rotates, and the first communicating groove 323 on one half-circumferential side of the spool 32 rotates to communicate with the first port 311 on one half-circumferential side of the valve housing 31, and at the same time, the second communicating groove 324 on the other half-circumferential side of the spool 32 communicates with the second port 312 on the other half-circumferential side of the valve housing 31. Because the first circulation groove 323 is communicated with the first axial passage 321, the first axial passage 321 is communicated with the annular oil inlet groove 325, the second circulation groove 324 is communicated with the second axial passage 322, and the second axial passage 322 is communicated with the annular oil return groove 326, an oil inlet passage of the hydraulic oil sequentially passes through an oil outlet of the hydraulic source 4, an oil inlet 313 of the reversing valve 3, the annular oil inlet groove 325, the first axial passage 321, the first circulation groove 323, the first oil port 311, a pipeline, and the first hydraulic hole 211 of the hydraulic cylinder 2 to enter the first cavity 213; the oil return path of the hydraulic oil returns to the hydraulic source 4 through the second cavity 214 of the hydraulic cylinder 2, the second hydraulic hole 212, the pipeline, the second oil port 312 of the directional valve 3, the second circulation groove 324, the second axial passage 322, the annular oil return groove 326, and the oil return port 314 in sequence. In the process, the piston 22 moves towards one side close to the valve cavity 112 under the pushing of the hydraulic oil, so as to drive the hydraulic rod 23 to move, the hydraulic rod 23 pushes the suction check valve 14 to move towards the valve cavity 112, the suction check valve 112 is opened, and the foam liquid fills the valve cavity 112 through the suction check valve 14 due to the closing of the discharge check valve 12 at the moment.

When the plunger 13 is pushed out to the outside of the valve chamber 112 to the dead point and starts to advance in the reverse direction into the valve chamber 112 to enter the discharge stroke, the spool 32 continues to rotate in the same direction due to the plunger 13 being linked with the spool 32, the first communicating groove 323 on one half-circumferential side of the spool 32 rotates to communicate with the second port 312 on one half-circumferential side of the valve housing 31, and at the same time, the second communicating groove 324 on the other half-circumferential side of the spool 32 communicates with the second port 312 on the other half-circumferential side of the valve housing 31. Because the first circulation groove 323 is communicated with the first axial passage 321, the first axial passage 321 is communicated with the annular oil inlet groove 325, the second circulation groove 324 is communicated with the second axial passage 322, and the second axial passage 322 is communicated with the annular oil return groove 326, an oil inlet passage of the hydraulic oil sequentially passes through an oil outlet of the hydraulic source 4, an oil inlet 313 of the reversing valve 3, the annular oil inlet groove 325, the first axial passage 321, the first circulation groove 323, the second oil port 312, a pipeline, and the second hydraulic hole 212 of the hydraulic cylinder 2 to enter the second chamber 214; the oil return path of the hydraulic oil returns to the hydraulic source 4 through the first cavity 214 of the hydraulic cylinder 2, the first hydraulic hole 212, the pipeline, the first oil port 311 of the directional valve 3, the second flow groove 324, the second axial passage 322, the annular oil return groove 326, and the oil return port 314 in sequence. In the process, the piston 22 moves towards the side far away from the valve cavity 112 under the pushing of the hydraulic oil, so as to drive the hydraulic rod 23 to move, the hydraulic rod 23 pushes the suction check valve 14 to move towards the outside of the valve cavity 112, the suction check valve 14 is closed, at the moment, the plunger 13 continues to push inwards, and as the suction check valve 14 is closed, the foam liquid in the valve cavity 112 is compressed, the pressure is increased, the discharge check valve 12 is pushed open, and the foam liquid in the valve cavity 112 is pumped out.

In a working period of the hydraulic end of the upper plunger pump, the suction one-way valve 14 is actively opened and closed, the suction one-way valve 14 is ensured to be normally opened and closed when compressible foam liquid is pumped, and the problem that the pump is failed due to the fact that the suction one-way valve 14 cannot be normally opened and closed is solved.

The rotary reversing valve realizes the synchronization of the whole working period of the cylindrical valve core 32 and the plunger 13, does not need to control the rotation of the cylindrical valve core 32 independently, and reduces the control difficulty.

Further, in the present embodiment, the first and

second flow grooves

323 and 324 are both arc-shaped grooves, the circumferential angle of the arc-shaped grooves is less than 180 degrees, the first and

second flow grooves

323 and 324 are located at the same height as the first and

second oil ports

311 and 312, the continuous communication between the first flow groove 323 and the

first oil port

311 or 312 is maintained within a certain angle of rotation of the spool 32, and accordingly, the continuous communication between the second flow groove 324 and the

second oil port

312 or 311 is maintained.

Of course, the first and

second flow grooves

323 and 324 may also be two notches provided on two semi-circumferential sides of the spool 32, as long as the two notches alternately communicate with the first and

second oil ports

311 and 312 as the spool 32 rotates, and the structure is not limited to the structure illustrated in the embodiment.

In the present embodiment, a land 33 is fixed to one end of the spool 32, and the land 33 and the plunger 13 are interlocked with each other by a crankshaft. Because the plunger 13 is driven by the crankshaft to reciprocate, the cylindrical valve core 32 is in transmission with the crankshaft through the connecting disc 33, and the crankshaft drives the connecting disc 33 to rotate, so that the cylindrical valve core 32 is driven to rotate, the automatic synchronization of the plunger 13 and the cylindrical valve core 32 is realized, the plunger 13 is ensured to complete one stroke cycle, and the cylindrical valve core 32 just rotates for one circle. The cylindrical valve core 32 does not need to be controlled independently, and the control difficulty is reduced.

As shown in fig. 3, in the present embodiment, the first oil ports 311 and the second oil ports 312 on the valve cylinder 31 correspond to one another, and the number of the first oil ports 311 and the second oil ports 312 is one or more, and accordingly, the first flow grooves 323 and the second flow grooves 324 on the cylindrical valve core 32 correspond to one another, and correspond to the first oil ports 311 and the second oil ports 312. In the case where a plurality of first oil ports 311, second oil ports 312, first flow grooves 323, and second flow grooves 324 are provided, the plurality of first flow grooves 323 and the plurality of second flow grooves 324 are all distributed in the axial direction of the spool 32, and the plurality of first oil ports 311 and the plurality of second oil ports 312 are also all distributed in the axial direction of the valve cylinder 31. The first hydraulic hole 211 and the second hydraulic hole 212 of one hydraulic cylinder 2 are respectively and correspondingly communicated with the first oil port 311 and the second oil port 312, and the reversing valve 3 with a plurality of first oil ports 311 and second oil ports 312 is provided, so that the driving of a plurality of hydraulic cylinders 2 can be realized simultaneously, and the pumping of a plurality of hydraulic end bodies 1 can be realized simultaneously.

Further, in the present embodiment, sealing rings are disposed between every two adjacent first circulation grooves 323, between every two adjacent second circulation grooves 324, and between the annular oil inlet groove 325 and the annular oil return groove 326, so that the sealing rings can better isolate the oil inlet passage and the oil return passage, and the sealing performance, the sensitivity and the reliability of the operation of the oil inlet passage and the oil return passage can be ensured.

As shown in fig. 1, in the present embodiment, the suction hole 113 of the hydraulic end body 1 is provided with a centering ring 5 sleeved on the hydraulic rod 23. The hydraulic rod 23 is ensured to move centrally along the axial direction of the suction check valve 14, and the opening and closing reliability of the suction check valve 14 is ensured.

Further, in the present embodiment, the hydraulic rod 23 is mounted with the elastic restoring member 6, and both ends of the elastic restoring member 6 respectively elastically act on the valve box 11 of the hydraulic end body 1 and the hydraulic rod 23. The elastic return member 6 is preferably a spring ensuring a quick closing of the suction check valve 14.

Further, in the present embodiment, when the plunger 13 at the fluid end moves to a dead point in the valve cavity 112, the volume of the valve cavity 112 is reduced as much as possible, the foam liquid remaining in the valve cavity 112 is reduced as much as possible, and the pumping efficiency is further improved.

Based on the fluid end described in any of the above embodiments, the embodiment of the present invention further provides a hydraulic plunger pump, which includes a power end and the fluid end described in any of the above embodiments.

Owing to adopted the fluid end in this application, consequently, guarantee the normal opening and closing of inhaling check valve when the pump notes compressible foam liquid, and then guaranteed the normal pump of hydraulic pressure plunger pump and annotated.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

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

Claims

1. The utility model provides a hydraulic end of hydraulic pressure plunger pump, includes hydraulic end body (1), its characterized in that still includes: the driving end of the one-way valve driving device is in driving connection with a suction one-way valve (14) of the hydraulic end body (1), the hydraulic end pumps compressible foam liquid, and the driving end of the one-way valve driving device assists in driving the suction one-way valve (14) to be actively opened in a suction stroke and actively closed in a discharge stroke so as to avoid the phenomenon that the suction one-way valve (14) cannot be normally opened and closed due to expansion and compression of the foam liquid; the check valve driving device includes:

the hydraulic pump comprises a hydraulic cylinder (2), a piston (22) is arranged in a hydraulic cavity of the hydraulic cylinder (2) in a moving mode, the hydraulic cavity is divided into a first cavity (213) and a second cavity (214) by the piston (22), one end of the piston (22) is connected with a hydraulic rod (23), the hydraulic rod (23) is in driving connection with a suction one-way valve (14), the hydraulic cylinder (2) is provided with a first hydraulic hole (211) and a second hydraulic hole (212), the first hydraulic hole (211) is communicated with the first cavity (213), and the second hydraulic hole (212) is communicated with the second cavity (214);

the oil return valve (3) is provided with a valve core, an oil inlet (313), an oil return port (314), a first oil port (311) and a second oil port (312), the first oil port (311) is communicated with the first hydraulic hole (211), the second oil port (312) is communicated with the second hydraulic hole (212), and the first oil port (311) and the second oil port (312) alternately perform oil inlet and oil return along with the periodic change of the suction stroke and the discharge stroke through the action of the valve core;

a hydraulic source (4), the hydraulic source (4) being in communication with the oil inlet (313) and the oil return (314) for supplying and recovering fluid.

2. The fluid end according to claim 1, wherein the direction valve (3) is a rotary direction valve comprising:

the cylinder wall of the valve cylinder (31) is provided with the first oil port (311), the second oil port (312), the oil inlet (313) and the oil return port (314), and the first oil port (311) and the second oil port (312) are respectively arranged on two semi-circumferential sides of the circumferential cylinder wall of the valve cylinder (31);

the spool is a cylindrical spool (32), the cylindrical spool (32) is rotatably arranged in the valve cylinder (31), the peripheral surface of the cylindrical spool (32) is in sealed rotation fit with the inner wall of the valve cylinder (31), the cylindrical spool (32) is synchronously linked with the plunger (13) of the fluid end body (1), the plunger (13) completes one stroke cycle, the cylindrical spool (32) rotates for one cycle, the peripheral surface of the cylindrical spool (32) is provided with a first flow through groove (323), a second flow through groove (324), an annular oil inlet groove (325) and an annular oil return groove (326) which are isolated from each other, a first axial channel (321) and a second axial channel (322) are arranged inside the cylindrical spool (32), the annular oil inlet groove (325) and the first flow through groove (323) are communicated with the first axial channel (321), the annular oil return groove (326) and the second flow through groove (324) are communicated with the second axial channel (322), the annular oil inlet groove (325) is communicated with the annular oil inlet groove (313), and the annular oil return groove (324) is communicated with the second flow through groove (326) and the annular oil inlet groove (324) is respectively communicated with the second flow through groove (326) and the second flow through groove (324) at the peripheral surface of the first flow through groove (326) and the second flow through groove (324), the first and second flow grooves (323, 324) are alternately communicated with the first and second oil ports (311, 312) as the spool (32) rotates.

3. The fluid end of claim 2 wherein the first flow channel (323) and the second flow channel (324) are each arcuate slots having a circumferential angle of less than 180 degrees.

4. The fluid end according to claim 2, wherein a connecting disc (33) is fixed at one end of the cylindrical valve core (32), and the connecting disc (33) and the plunger (13) are linked through a crankshaft.

5. The fluid end according to claim 2, characterized in that the first oil port (311), the second oil port (312), the first flow channel (323) and the second flow channel (324) are equal in number and are one or more, and the plurality of first flow channels (323) and the plurality of second flow channels (324) are distributed along the axial direction of the cylindrical spool (32); the first hydraulic hole (211) and the second hydraulic hole (212) of one of the hydraulic cylinders (2) are respectively and correspondingly communicated with one of the first oil ports (311) and one of the second oil ports (312).

6. The fluid end according to claim 5, wherein sealing rings are arranged between every two adjacent first flow channels (323), between every two adjacent second flow channels (324) and between the annular oil inlet groove (325) and the annular oil return groove (326).

7. The fluid end according to claim 1, characterized in that the suction hole (113) of the fluid end body (1) is provided with a centering ring (5) which is sleeved on the hydraulic rod (23).

8. The fluid end according to claim 1, characterized in that an elastic restoring member (6) is mounted on the hydraulic rod (23), and two ends of the elastic restoring member (6) respectively elastically act on the hydraulic rod (23) and a valve box (11) of the fluid end body (1).

9. A hydraulic plunger pump comprising a fluid end, wherein the fluid end is as claimed in any one of claims 1 to 8.