CN113757099B - Control valve for electric control plunger pump - Google Patents
Control valve for electric control plunger pump Download PDFInfo
- Publication number
- CN113757099B CN113757099B CN202111045823.2A CN202111045823A CN113757099B CN 113757099 B CN113757099 B CN 113757099B CN 202111045823 A CN202111045823 A CN 202111045823A CN 113757099 B CN113757099 B CN 113757099B
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- Prior art keywords
- valve
- control
- oil duct
- emergency
- control valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a control valve for an electric control plunger pump, which comprises a cover plate, a valve block and an electric proportional valve, wherein the cover plate is arranged on the valve block, the valve block is provided with a valve cavity, a pilot valve assembly, a control valve assembly and a spring adjusting assembly are sequentially arranged in the valve cavity along the axial direction, a pressure relief oil duct and a control oil duct are arranged on the cover plate, an installation cavity is arranged on the cover plate, the installation cavity penetrates through the pressure relief oil duct, the installation cavity penetrates through the control oil duct, an emergency valve core capable of axially moving is arranged in the installation cavity, the emergency valve core is provided with a first position and a second position, and the pressure relief oil duct is not communicated with the control oil duct when in the first position; and in the second position, the pressure relief oil duct is communicated with the control oil duct. When the electric proportional valve is damaged and stops working, the control oil duct is decompressed through the emergency valve core, the problem that the engine is started to stop fire is avoided, meanwhile, the safety problem caused by incapability of decompressing and maintaining is avoided, the whole machine can quickly reach a safety area to maintain, and the emergency valve core is simple in structure and low in processing cost.
Description
Technical Field
The invention relates to the technical field of hydraulic pumps, in particular to a control valve for an electric control plunger pump.
Background
The electric control is a common control form of the plunger pump, and the hydraulic pump can control the output flow of the pump according to the input electric signal. The electric control hydraulic pump control valve can push the variable control valve core through the secondary pressure output by the electric proportional valve to control the displacement of the pump. However, the electric control plunger pump has the following conditions that when the electric proportional valve is damaged and the pump is in a large displacement condition, when the power required by the hydraulic pump exceeds the power of the engine, the engine is started to stop fire, and the whole machine cannot move.
In the prior art, the problem that pressure oil between a pilot valve core and an electric proportional valve cannot be decompressed due to damage of the electric proportional valve is not considered, a valve port of a control valve is in a closed state, a pump cannot recover to small displacement, and when an engine is started, the pump is in a large displacement state, and the condition that the engine is out of fire is caused; when the proportional valve is damaged, pressure oil between the pilot valve core and the electric proportional valve cannot be decompressed, so that potential safety hazards exist during maintenance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the control valve for the electric control plunger pump, which can effectively solve the problems of starting the engine to stop fire and releasing pressure of an oil way between the proportional valve and the control valve under the condition that the proportional valve is damaged, and improves the maintenance safety; simple structure effectively reduces the maintenance degree of difficulty and product cost.
The control valve for the electric control plunger pump comprises a cover plate, a valve block and an electric proportional valve, wherein the cover plate is arranged on the valve block, the valve block is provided with a valve cavity, a pilot valve assembly, a control valve assembly and a spring adjusting assembly are sequentially arranged in the valve cavity along the axial direction, the pilot valve assembly comprises a pilot valve sleeve and a pilot valve core, the control valve assembly comprises a control valve sleeve and a control valve core, the pilot valve core, the control valve core and the spring adjusting assembly are coaxially arranged, a control oil duct for providing pressure oil for pushing the pilot valve core to axially move is arranged on the cover plate, the control oil duct is communicated with a pressure oil outlet of the electric proportional valve, a feedback rod is hinged on the valve block, the feedback rod is hinged on the control valve sleeve, the feedback rod is connected with a variable piston, a pressure relief oil duct is arranged on the cover plate, a mounting cavity is arranged on the cover plate, the mounting cavity is communicated to the pressure relief valve sleeve, the mounting cavity is communicated to the control oil duct, an emergency valve core capable of axially moving is arranged in the pilot valve cavity, the emergency valve core is communicated with the control oil duct, and the emergency valve core is provided with a first position and a second position, and the emergency valve channel is not communicated with the control oil duct when the emergency valve is in the first position; when the emergency valve core is in the second position, the pressure relief oil duct is communicated with the control oil duct.
Optionally, the emergency valve core is provided with a communication groove formed along the peripheral wall, and when the emergency valve core is in the second position, the communication groove is communicated with the pressure relief oil duct and the control oil duct.
Optionally, the emergency valve core, the pilot valve core and the control valve core are all coaxially arranged.
Optionally, the pressure relief oil duct is perpendicular to the control oil duct.
Optionally, the pressure relief oil passage is arranged in parallel with the control oil passage.
Optionally, the width of the communication groove along the axial line direction of the emergency valve core is larger than the vertical distance between the pressure relief oil duct and the control oil duct.
Optionally, the emergency valve core is assembled on the cover plate through threaded connection.
Optionally, a sealing ring is arranged between the emergency valve core and the cover plate.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects: according to the control valve for the electric control plunger pump, the emergency valve core is additionally arranged on the cover plate, when the electric proportional valve is damaged and stops working, the emergency valve core can be used for releasing pressure of the control oil duct, the problem that an engine is started to stop fire is avoided, meanwhile, the safety problem caused by the fact that the engine cannot be released to maintain is avoided, the whole machine can quickly reach a safety area to maintain, and the emergency valve core is simple in structure and low in processing cost.
Drawings
FIG. 1 is a schematic diagram of a control valve for an electrically controlled plunger pump according to the present invention;
FIG. 2 is a schematic diagram of the assembly of a control valve sleeve and a feedback rod in the control valve for an electronically controlled plunger pump of the present invention;
FIG. 3 is a schematic view of an emergency valve core, a pressure relief oil duct and a control oil duct in the control valve for the electric control plunger pump of the invention;
fig. 4 is a system schematic diagram of the control valve for the electric control plunger pump of the present invention.
In the accompanying drawings: the hydraulic control valve comprises a 1-cover plate, a 2-valve block, a 3-electric proportional valve, a 4-first hinge shaft, a 5-transition seat, a 6-adjusting spring, a 7-spring seat, an 8-connecting piece, a 9-adjusting bolt, a 10-pressing plate, an 11-feedback rod, a 12-control valve sleeve, a 13-control valve core, a 14-pilot valve sleeve, a 15-pilot valve core, a 17-sealing ring, a 18-emergency valve core, a 19-second hinge shaft, a 20-control oil duct and a 21-relief oil duct.
Detailed Description
Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding, and are to be considered merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
As shown in fig. 1 to 4, the control valve for the electric control plunger pump in the embodiment of the invention comprises a cover plate 1, a valve block 2 and an electric proportional valve 3, wherein the cover plate 1 is arranged on the valve block 2, the valve block 2 is provided with a valve cavity, a pilot valve assembly, a control valve assembly and a spring adjusting assembly are sequentially arranged in the valve cavity along the axial direction, the pilot valve assembly comprises a pilot valve sleeve 14 and a pilot valve core 15, the control valve assembly comprises a control valve sleeve 12 and a control valve core 13, the pilot valve core 15, the control valve core 13 and the spring adjusting assembly are coaxially arranged, the spring adjusting assembly comprises a transition seat 5, an adjusting spring 6, a spring seat 7 and an adjusting bolt 9 which are axially and sequentially connected, the control valve core 13 is abutted against the transition seat 5, the spring seat 7 is arranged on the valve block 2, a pressing plate 10 is arranged on the valve block 2 through a connecting piece 8, the pressing plate 10 is provided with the adjusting bolt 9, the inner end part of the adjusting bolt 9 is abutted against the spring seat 7, the cover plate 1 is provided with a control valve 20 for providing pressure oil for pushing the axial movement of the pilot valve core 15, the control valve 20 is communicated with a pressure oil outlet of the electric proportional valve 3, the valve block 2 is arranged on the first hinge shaft 4, the control valve sleeve 11 is hinged with a feedback rod 11, and is arranged in the middle part of the valve block 2 and is in a second oil channel 18 which is arranged in a position which is not communicated with the first oil channel and a second oil channel 18 and is arranged, and is connected with the first oil channel and an emergency valve channel, and an emergency valve channel 21 is arranged in the position which is connected with the emergency valve channel and a second oil channel and an emergency valve channel 18 and an emergency valve channel and an emergency valve 18 which is arranged in the position and an emergency valve channel and an emergency valve 18 and is arranged in the emergency valve channel and an emergency valve 18 and is arranged; when the emergency spool 18 is in the second position, the relief oil passage 21 communicates with the control oil passage 20.
The emergency valve core 18 is provided with a communication groove formed along the peripheral wall, when the emergency valve core 18 is positioned at the second position, the communication groove is communicated with the pressure relief oil duct 21 and the control oil duct 20, the emergency valve core 18, the pilot valve core 15 and the control valve core 13 are coaxially arranged, the width of the communication groove along the axial line direction of the emergency valve core 18 is larger than the vertical distance between the pressure relief oil duct 21 and the control oil duct 20, the emergency valve core 18 is arranged on the cover plate 1 in a threaded assembly mode, a sealing ring 17 is arranged between the emergency valve core 18 and the cover plate 1, the direction of the pressure relief oil duct 21 can be determined according to the structure of the whole control valve and the position of the external structure, and in some embodiments, the pressure relief oil duct 21 and the control oil duct 20 can be vertically arranged in different surfaces; in other embodiments, the relief oil passage 21 and the control oil passage 20 may be arranged in parallel; for the positions where the pressure relief oil duct 21 and the control oil duct 20 are arranged, the pressure relief oil duct 21 and the control oil duct 20 only need to be communicated with the installation cavity of the emergency valve core 18, and when the emergency valve core is moved to different positions, whether the pressure relief oil duct and the control oil duct are communicated with each other or not can be controlled.
The emergency valve core 18 is equivalent to a two-position two-way valve, and the technical aim of the technical scheme of the invention can be also achieved if the valve core is changed into other slide valve structures, or the slide valve seal between the oil port P1 and the oil drain port T is changed into conical surface seal.
The working process comprises the following steps: the distal end of the feedback rod 11 is connected to the variable piston of the plunger pump, the current is input to the electric proportional valve 3, the pressure oil output by the electric proportional valve 3 acts on the pilot valve core 15 through the P1 port, the pilot valve core 15 pushes the control valve core 13 to move under the action of the pressure oil, the other end of the control valve core 13 compresses the spring adjusting device, the force balance state is finally achieved, the control valve core 13 stops moving, at the moment, the channel from the load oil port P to the variable control piston oil port A is closed, the channel from the variable control piston oil port A to the oil drain port T is opened, the variable piston is pushed to drive the swash plate to change the inclination angle, and meanwhile the feedback rod 11 is driven to rotate to drive the control valve sleeve 12 to move in the same direction as the control piston, so that the channel from the variable control piston oil port A to the oil drain port T is closed, and at the moment, the variable control piston stops moving.
When the pump is at a certain displacement, the oil between the electro-proportional valve 3 and the pilot valve core 15 cannot be decompressed, so that when the whole machine is stopped, the control valve core 13 is still in a balanced state, and the inclination angle of a swash plate of the pump is fixed. When the host computer is started again, the pump is in large displacement at the moment, and when the power of the engine is exceeded, the engine is flameout and cannot be started normally. At this time, by adjusting the position of the emergency valve core 18, the oil port P1 is communicated with the oil drain port T, even if the pressure relief oil duct 21 is communicated with the control oil duct 20, the control valve core 13 pushes the pilot valve core 15 to move under the action of the spring device, when the pilot control valve core 13 contacts with the emergency valve core 18, the position of the control valve core 13 can be adjusted by adjusting the screwing depth of the emergency valve core 18, so that the inclination angle of a swash plate of the pump is adjusted, the pump is started without exceeding power, and meanwhile, the whole machine can quickly reach a safety area for maintenance.
Compared with the prior art, the control valve for the electric control plunger pump has the advantages that:
according to the control valve for the electric control plunger pump, the emergency valve core is additionally arranged on the cover plate, when the electric proportional valve is damaged to stop working, the emergency valve core can be used for releasing pressure of the control oil duct, the problem of starting fire holding of an engine is avoided, meanwhile, the safety problem caused by incapability of releasing pressure for maintenance is avoided, the whole machine can quickly reach a safety area for maintenance, in addition, the emergency valve core is simple in structure, is arranged in the cover plate, does not need to be additionally provided with additional elements in a system, and is convenient to assemble, and low in processing and application cost.
The above embodiments do not limit the scope of the invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives can occur depending upon design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. The control valve for the electric control plunger pump is characterized by comprising a cover plate, a valve block and an electric proportional valve, wherein the cover plate is arranged on the valve block, the valve block is provided with a valve cavity, a pilot valve assembly, a control valve assembly and a spring adjusting assembly are sequentially arranged in the valve cavity along the axial direction, the pilot valve assembly comprises a pilot valve sleeve and a pilot valve spool, the control valve assembly comprises a control valve sleeve and a control valve spool, the pilot valve spool, the control valve spool and the spring adjusting assembly are coaxially arranged, a control oil duct for providing pressure oil for pushing the pilot valve spool to axially move is arranged on the cover plate, the control oil duct is communicated to a pressure oil outlet of the electric proportional valve, a feedback rod is hinged on the valve block, the feedback rod is hinged on the control valve sleeve, the feedback rod is connected with a variable piston, a pressure relief oil duct is arranged on the cover plate, a mounting cavity is arranged on the cover plate, the mounting cavity is communicated to the pressure relief oil duct, the mounting cavity is communicated to the control valve sleeve, an emergency capable of axially moving is arranged in the mounting cavity, the emergency valve spool is communicated with the emergency valve spool, and the emergency valve spool is provided with a first position and a second position, and is not communicated with the pressure oil duct when the emergency valve spool is in the first position; when the emergency valve core is in the second position, the pressure relief oil duct is communicated with the control oil duct.
2. The control valve for an electric control plunger pump as set forth in claim 1, wherein said emergency valve element has a communication groove provided along an outer peripheral wall, and said communication groove communicates with both said relief oil passage and said control oil passage when said emergency valve element is in the second position.
3. The control valve for an electrically controlled plunger pump according to claim 1, wherein the emergency valve spool, the pilot valve spool, and the control valve spool are all coaxially arranged.
4. The control valve for an electrically controlled plunger pump according to claim 2, wherein the relief oil passage is arranged perpendicular to the control oil passage.
5. The control valve for an electronically controlled plunger pump as set forth in claim 2, wherein said relief oil passage is arranged in parallel with said control oil passage.
6. The control valve for an electric control plunger pump according to claim 4 or 5, wherein a width of the communication groove in a direction of an axial line of the emergency valve spool is larger than a vertical distance between the relief oil passage and the control oil passage.
7. The control valve for an electronically controlled plunger pump as set forth in claim 1, wherein said emergency valve core is assembled to said cover plate by a threaded connection.
8. The control valve for an electric control plunger pump as set forth in claim 1, wherein a seal ring is provided between the emergency valve core and the cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045823.2A CN113757099B (en) | 2021-09-07 | 2021-09-07 | Control valve for electric control plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111045823.2A CN113757099B (en) | 2021-09-07 | 2021-09-07 | Control valve for electric control plunger pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113757099A CN113757099A (en) | 2021-12-07 |
| CN113757099B true CN113757099B (en) | 2023-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111045823.2A Active CN113757099B (en) | 2021-09-07 | 2021-09-07 | Control valve for electric control plunger pump |
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| Country | Link |
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| CN (1) | CN113757099B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003185042A (en) * | 2001-12-17 | 2003-07-03 | Shin Caterpillar Mitsubishi Ltd | Line relief valve |
| CN104728431A (en) * | 2015-03-31 | 2015-06-24 | 中国船舶重工集团公司第七一一研究所 | Electromagnetic control valve with adjustable voltage and speed adjusting variable torque transmission device hydraulic system adopting same |
| CN108331743A (en) * | 2018-03-16 | 2018-07-27 | 江苏恒立液压科技有限公司 | Hydraulic plunger pumpage and alternating power control mechanism |
| CN111894948A (en) * | 2020-07-02 | 2020-11-06 | 平高东芝（河南）开关零部件制造有限公司 | High oil pressure equipment protection device and hydraulic pressure operating mechanism |
| CN112594244A (en) * | 2020-12-16 | 2021-04-02 | 上海航天控制技术研究所 | Mechanical hydraulic control reversing valve |
-
2021
- 2021-09-07 CN CN202111045823.2A patent/CN113757099B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003185042A (en) * | 2001-12-17 | 2003-07-03 | Shin Caterpillar Mitsubishi Ltd | Line relief valve |
| CN104728431A (en) * | 2015-03-31 | 2015-06-24 | 中国船舶重工集团公司第七一一研究所 | Electromagnetic control valve with adjustable voltage and speed adjusting variable torque transmission device hydraulic system adopting same |
| CN108331743A (en) * | 2018-03-16 | 2018-07-27 | 江苏恒立液压科技有限公司 | Hydraulic plunger pumpage and alternating power control mechanism |
| CN111894948A (en) * | 2020-07-02 | 2020-11-06 | 平高东芝（河南）开关零部件制造有限公司 | High oil pressure equipment protection device and hydraulic pressure operating mechanism |
| CN112594244A (en) * | 2020-12-16 | 2021-04-02 | 上海航天控制技术研究所 | Mechanical hydraulic control reversing valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113757099A (en) | 2021-12-07 |
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