CN211202468U - Closed plunger pump - Google Patents
Closed plunger pump Download PDFInfo
- Publication number
- CN211202468U CN211202468U CN201922232333.8U CN201922232333U CN211202468U CN 211202468 U CN211202468 U CN 211202468U CN 201922232333 U CN201922232333 U CN 201922232333U CN 211202468 U CN211202468 U CN 211202468U
- Authority
- CN
- China
- Prior art keywords
- valve
- port
- logic
- communicated
- servo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Reciprocating Pumps (AREA)
Abstract
The utility model relates to the field of hydraulic pressure technology, a closed plunger pump is disclosed, include: pump case, main pump, first main oil circuit, second main oil circuit, servo cylinder, shuttle valve, first logic valve, first overflow valve, first branch road, second logic valve, second overflow valve, second branch road, first damping hole and second damping hole, wherein, first logic valve, second logic valve, first overflow valve and second overflow valve are all installed in the pump case outside, and the inside or outside of pump case is located to the shuttle valve, the utility model discloses a closed plunger pump can rise suddenly at hydraulic fluid port pressure, when the motor card dies, and automatic, reliable control discharge capacity returns to zero rapidly, avoids plunger pump and motor permanent damage.
Description
Technical Field
The utility model relates to the technical field of hydraulic pressure, especially, relate to a closed plunger pump.
Background
The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like. Plunger pumps are widely used in applications where high pressure, high flow and flow needs to be regulated, such as hydraulic machines, engineering machinery and ships.
The plunger pump is widely applied to engineering machinery and industrial hydraulic equipment, the rated pressure is 400bar, the rated pressure is high, when the load change is too fast and the pressure cut-off device of the plunger pump cannot quickly cut off the pressure, the pressure impact is higher than the design expectation, in addition, the motor is blocked together with the load change, at the moment, if the plunger pump cannot control the displacement to return to zero as soon as possible, the low-pressure side pressure of the closed circuit is reduced and exceeds the allowable value, and the conditions that the pressure impact is higher than the design expectation and the low-pressure side pressure of the closed circuit is reduced and exceeds the allowable value can cause the permanent damage of the plunger pump and the motor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving above-mentioned technical problem, provide one kind can be under hydraulic fluid port pressure risees suddenly, the dead condition of motor card, the closed plunger pump that the control discharge capacity returns to zero rapidly, the life of extension closed plunger pump.
In order to achieve the above object, the utility model provides a closed plunger pump, include:
a pump housing;
the main pump is arranged in the pump shell and is used for being connected with a driving shaft of an engine, and a swash plate is arranged in the main pump;
the first main oil way is connected with the main pump and is provided with a first pressure measuring port;
the second main oil way is connected with the main pump and is provided with a second pressure measuring port;
the servo oil cylinder is arranged in the pump shell, a piston is arranged in the servo oil cylinder, the piston limits the interior of the servo oil cylinder into a first chamber and a second chamber, and the piston is connected with one end of the swash plate;
a shuttle valve for selecting a high pressure in the first and second main oil passages;
the first logic valve is a two-position four-way valve, a first valve port of the first logic valve is communicated with the first pressure measuring port, a second valve port of the first logic valve is communicated with the interior of the pump shell through a first overflow valve, a third valve port of the first logic valve is communicated with an oil outlet of the shuttle valve, and a fourth valve port of the first logic valve is communicated with the first chamber; when the valve is in a normal position, the four ports of the first logic valve are not communicated, and after the valve is displaced, the first port of the first logic valve is communicated with the second port of the first logic valve, and the third port of the first logic valve is communicated with the fourth port of the first logic valve;
the two ends of the first branch are respectively connected with a first valve port of the first logic valve and a second valve port of the first logic valve, and the first branch is connected with a first damping hole in series;
the first valve port of the first logic valve is communicated with the first pressure measuring port, the second valve port of the first logic valve is communicated with the inside of the pump shell through a first overflow valve, the third valve port of the first logic valve is communicated with the oil outlet of the shuttle valve, and the fourth valve port of the first logic valve is communicated with the first chamber; in a normal position, the four ports of the second logic valve are not communicated, and after displacement, the first port of the second logic valve is communicated with the second port of the second logic valve and the third port of the second logic valve is communicated with the fourth port of the second logic valve;
the two ends of the second branch are respectively connected with the first valve port of the second logic valve and the second valve port of the second logic valve, and the second branch is connected with a second damping hole in series;
the first logic valve, the second logic valve, the first overflow valve and the second overflow valve are all installed outside the pump shell, and the shuttle valve is arranged inside or outside the pump shell.
Preferably, the hydraulic control valve further comprises a third damping hole and a fourth damping hole, the third damping hole is connected in series to a pipeline communicating a third valve port of the first logic valve with an oil outlet of the shuttle valve,
the fourth damping hole is connected in series to a pipeline which communicates the third valve port of the second logic valve with the oil outlet of the shuttle valve.
Preferably, springs capable of adjusting opening pressure are arranged in the first overflow valve and the second overflow valve.
Preferably, the first logic valve and the second logic valve are both balanced type normally closed logic valves.
Preferably, a spring for setting a pressure cutoff value is provided in each of the first logic valve and the second logic valve.
Preferably, the device also comprises an oil supplementing pump and a servo valve which are arranged in the pump shell,
the oil replenishing pump is used for being connected with a driving shaft of an engine,
the servo valve is a three-position four-way valve, a first valve port of the servo valve is communicated with the first chamber, a second valve port of the servo valve is communicated with the second chamber, a third valve port of the servo valve is communicated with the inside of the pump shell, and a fourth valve port of the servo valve is communicated with an oil outlet of the oil replenishing pump; and in a normal position, the four valve ports of the servo valve are not communicated, after displacement, the first valve port of the servo valve is communicated with the third valve port of the servo valve, the second valve port of the servo valve is communicated with the fourth valve port of the servo valve, or the first valve port of the servo valve is communicated with the fourth valve port of the servo valve, and the second valve port of the servo valve is communicated with the third valve port of the servo valve.
Preferably, a fifth damping hole is connected in series to a pipeline connecting the first port of the servo valve and the first chamber, and a sixth damping hole is connected in series to a pipeline connecting the second port of the servo valve and the second chamber.
Preferably, the fourth valve port of the servo valve is communicated with the oil outlet of the oil replenishing pump through a control oil path, and the control oil path is connected with a filter in series.
The embodiment of the utility model provides a closed plunger pump compares with prior art, and its beneficial effect lies in:
the embodiment of the utility model provides a closed plunger pump adopts the shuttle valve to select high-pressure oil, lets in high-pressure oil among the first cavity or the second cavity of servo cylinder, utilizes high-pressure oil to overcome servo cylinder's spring force, reduces the pressure differential of servo cylinder both sides cavity fast, and the time spent that makes the piston in the servo cylinder get back to the meso position is short to the time that consequently the sloping cam plate got back to the meso position in the main pump is short, and the time that the plunger pump discharge capacity returns to zero is also short; in addition, the pressure cut-off value that the pump discharge capacity of the first main oil way and the pump discharge capacity of the second main oil way return to zero can be set through the first logic valve and the second logic valve respectively, so that the closed plunger pump can be ensured to automatically, reliably and rapidly control the discharge capacity to return to zero when the oil port pressure suddenly rises and the motor is blocked, and the permanent damage to the plunger pump and the motor is avoided.
Furthermore, closed plunger pump still includes third damping hole and fourth damping hole, adjust the size of third damping hole and fourth damping hole and can realize adjusting the time that the plunger pump discharge capacity returns to zero, and needn't adjust the size of fifth damping hole and sixth damping hole on the servo cylinder, just also can not influence the time of plunger pump discharge capacity increase, both protected the plunger pump, avoid damaging because the discharge capacity increase is too fast, can satisfy the different demands of user to discharge capacity increase time and discharge capacity decrease time again.
Drawings
Fig. 1 is the hydraulic schematic diagram of the embodiment of the present invention.
In the drawings, 1, a pump casing; 2. a main pump; 3. a first main oil passage; 31. a first pressure port; 4. a second main oil passage; 41. a second pressure port; 5. a servo cylinder; 51. a piston; 52. a first chamber; 53. a second chamber; 6. a shuttle valve; 7. a first logic valve; 8. a first overflow valve; 9. a first branch; 10. a first orifice; 11. a second logic valve; 12. a second overflow valve; 13. a second branch circuit; 14. a second orifice; 15. a third orifice; 16. a fourth orifice; 17. an oil replenishing pump; 18. a servo valve; 19. sixth damping; 20. seventh damping; 21. controlling an oil path; 22. and (3) a filter.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "front", "back", and the like are used in the present invention as indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. It should be understood that the terms "first", "second", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
As shown in fig. 1, a preferred embodiment of the present invention provides a closed plunger pump, including: a pump housing 1; a main pump 2 arranged in the pump shell 1, wherein the main pump 2 is used for connecting with a driving shaft of an engine, and a swash plate is arranged in the main pump 2; a first main oil passage 3 connected to the main pump 2, the first main oil passage 3 having a first pressure measuring port 31; a second main oil passage 4 connected to the main pump 2, the second main oil passage 4 having a second pressure measuring port 41; a servo cylinder 5 installed in the pump housing 1, a piston 51 disposed inside the servo cylinder 5, the piston 51 defining the inside of the servo cylinder 5 into a first chamber 52 and a second chamber 53, and the piston 51 connected to one end of the swash plate; a shuttle valve 6 for selecting a high pressure in the first main oil passage 3 and the second main oil passage 4; the first logic valve 7 is a two-position four-way valve, a first valve port of the first logic valve 7 is communicated with the first pressure measuring port 31, a second valve port of the first logic valve 7 is communicated with the interior of the pump shell 1 through a first overflow valve 8, a third valve port of the first logic valve 7 is communicated with an oil outlet of the shuttle valve 6, and a fourth valve port of the first logic valve 7 is communicated with the first chamber 52; in a normal position, the four ports of the first logic valve 7 are not communicated, and after displacement, the first port of the first logic valve 7 is communicated with the second port of the first logic valve 7, and the third port of the first logic valve 7 is communicated with the fourth port of the first logic valve 7; a first branch 9, two ends of which are respectively connected with a first valve port of the first logic valve 7 and a second valve port of the first logic valve 7, and the first branch 9 is connected with a first damping hole 10 in series; a second logic valve 11, wherein the second logic valve 11 is a two-position four-way valve, a first valve port of the second logic valve 11 is communicated with a second pressure measuring port 41, a second valve port of the second logic valve 11 is communicated with the inside of the pump housing 1 through a second overflow valve 12, a third valve port of the second logic valve 11 is communicated with an oil outlet of the shuttle valve 6, and a fourth valve port of the second logic valve 11 is communicated with a second chamber 53; in a normal position, the four ports of the second logic valve 11 are not communicated, and after displacement, the first port of the second logic valve 11 is communicated with the second port of the second logic valve 11, and the third port of the second logic valve 11 is communicated with the fourth port of the second logic valve 11; a second branch 13, two ends of which are respectively connected to the first valve port of the second logic valve 11 and the second valve port of the second logic valve 11, and the second branch 13 is connected in series with a second orifice 14; the first logic valve 7, the second logic valve 11, the first overflow valve 8 and the second overflow valve 12 are all installed outside the pump housing 1, and the shuttle valve 6 is arranged inside or outside the pump housing 1.
Based on the above technical solution, in the present embodiment, a closed plunger pump is provided, when the pressure of the first pressure measuring port 31 (or the second pressure measuring port 41) on the first main oil path 3 (or the second main oil path 4) suddenly increases, and the pressure of the first pressure measuring port 31 (or the second pressure measuring port 41) exceeds the preset opening value of the first relief valve 8 (or the second relief valve 12), the oil is introduced into the pump housing 1 through the first relief valve 8 (or the second relief valve 12), at this time, the pressure on the right side of the second port of the first logic valve 7 (or the left side of the second port of the second logic valve 11) is lower than the pressure on the left side of the first port of the first logic valve 7 (or the right side of the first port of the second logic valve 11), and when the pressure difference between the right side of the second port of the first logic valve 7 (or the left side of the second port of the second logic valve 11) and the left side of the first port of the first logic valve 7 (or the right side of the first port of the second logic valve 11) is greater than the preset cut-off pressure value, the first logic valve 7 (or the second logic valve 11) is opened (i.e., shifted), at this time, high-pressure oil passes through the oil outlet of the shuttle valve 6, the third valve port of the first logic valve 7 and the fourth valve port of the first logic valve 7 in sequence and is introduced into the first chamber 52 of the servo oil cylinder 5, (or high-pressure oil passes through the oil outlet of the shuttle valve 6, the third valve port of the second logic valve 11 and the fourth valve port of the second logic valve 11 in sequence and is introduced into the second chamber 53 of the servo oil cylinder 5 in sequence) to carry out pressure unloading, the position of the piston 51 is changed along with the change of the position, the position of the swash plate in the main pump 2 is further changed, and the purposes of driving the swash plate in the main pump 2 to return to a neutral; in addition, the first logic valve 7, the second logic valve 11, the first overflow valve 8, the second overflow valve 12 and the shuttle valve 6 form an external pressure cut-off device, the installation is convenient, the cost is low, the design change is easy to carry out, the use is more flexible, the automatic and reliable control displacement can be rapidly reset to zero when the oil port pressure is suddenly increased and the motor is stuck, and the permanent damage to the plunger pump and the motor is avoided.
Preferably, the plunger pump further comprises a third orifice 15 and a fourth orifice 16, the third orifice 15 is connected in series to a pipeline communicating the third port of the first logic valve 7 with the oil outlet of the shuttle valve 6, and the fourth orifice 16 is connected in series to a pipeline communicating the third port of the second logic valve 11 with the oil outlet of the shuttle valve 6. The time for adjusting the displacement of the plunger pump to return to zero can be realized by adjusting the sizes of the third damping hole 15 and the fourth damping hole 16 without adjusting the sizes of the sixth damping 19 and the seventh damping 20 on the servo oil cylinder 5, so that the time for increasing the displacement of the plunger pump is not influenced, the plunger pump is protected, the damage caused by the excessively fast increase of the displacement is avoided, and different requirements of a user on the displacement increasing time and the displacement reducing time can be met.
Preferably, a spring capable of adjusting the opening pressure is provided in each of the first and second relief valves 8 and 12. When the oil pressure in the pipeline communicated with the first overflow valve 8 or the second overflow valve 12 reaches a preset opening value, the first overflow valve 8 or the second overflow valve 12 is opened.
Preferably, the first logic valve 7 and the second logic valve 11 are both balanced type normally closed logic valves, which are closed states at normal times.
Preferably, a spring for setting the pressure cutoff value is provided in each of the first logic valve 7 and the second logic valve 11. The spring force of the valve spring may be set to a certain value, i.e., a pressure cutoff value, in advance according to design requirements.
Preferably, the plunger pump further comprises an oil supplementing pump 17 and a servo valve 18 which are arranged in the pump shell 1, wherein the oil supplementing pump 17 is used for being connected with a driving shaft of an engine, the servo valve 18 is a three-position four-way valve, a first valve port of the servo valve 18 is communicated with the first chamber 52, a second valve port of the servo valve 18 is communicated with the second chamber 53, a third valve port of the servo valve 18 is communicated with the interior of the pump shell 1, and a fourth valve port of the servo valve 18 is communicated with an oil outlet of the oil supplementing pump 17; in a normal position, the four ports of the servo valve 18 are not communicated, and after the displacement, the first port of the servo valve 18 is communicated with the third port of the servo valve 18, the second port of the servo valve 18 is communicated with the fourth port of the servo valve 18, or the first port of the servo valve 18 is communicated with the fourth port of the servo valve 18, and the second port of the servo valve 18 is communicated with the third port of the servo valve 18. The servo valve 18 can change the position of the piston 51, change the tilt angle of the swash plate in the main pump 2, and further change the displacement of the plunger pump body by changing the oil pressure in the first chamber 52 and the second chamber 53 in the servo cylinder 5.
Preferably, a fifth orifice is connected in series with the pipeline connecting the first port of the servo valve 18 and the first chamber 52, and a sixth orifice 19 is connected in series with the pipeline connecting the second port of the servo valve 18 and the second chamber 53. By adjusting the sizes of the fifth damping hole and the sixth damping hole 19, the time required for changing the displacement of the plunger pump body can be adjusted.
Preferably, the fourth valve port of the servo valve 18 is communicated with the oil outlet of the oil replenishing pump 17 through a control oil path 21, and a filter 22 is connected in series on the control oil path 21. The oil liquid flows through a filter 22 from an oil outlet of the oil supplementing pump 17 and finally enters the servo oil cylinder 5.
The utility model discloses a working process does: it includes two states:
1. a state in which the pressure of the first pressure measurement port 31 (or the second pressure measurement port 41) in the first main oil passage 3 (or the second main oil passage 4) does not reach the opening value set by the first relief valve 8 (or the second relief valve 12):
at this time, the pressure difference between the two sides of the first damping hole 10 (or the second damping hole 14) is equal, the first overflow valve 8 (or the second overflow valve 12) is in a closed state, the first logic valve 7 (or the second logic valve 11) is in a normal position (namely a stop position) state, and the displacement of the closed plunger pump can be freely adjusted through the servo valve 18;
2. a state in which the pressure of the first pressure measurement port 31 (or the second pressure measurement port 41) in the first main oil passage 3 (or the second main oil passage 4) reaches the opening value set by the first relief valve 8 (or the second relief valve 12):
when the pressure of the first pressure measuring port 31 (or the second pressure measuring port 41) suddenly rises and the motor is stuck, at this time, the pressure of the first pressure measuring port 31 (or the second pressure measuring port 41) reaches the opening value set by the first overflow valve 8 (or the second overflow valve 12), the first overflow valve 8 (or the second overflow valve 12) is opened, the oil flows into the pump housing 1 through the first overflow valve 8 (or the second overflow valve 12), meanwhile, the pressure on the right side of the first damping orifice 10 (or the left side of the second damping orifice 14) is reduced, when the pressure difference on the two sides of the first damping orifice 10 (or the second damping orifice 14) is greater than the pressure cutoff value set by the first logic valve 7 (or the second logic valve 11), the first logic valve 7 (or the second logic valve 11) is displaced (i.e., switched to the flow position), the shuttle valve 6 in the plunger pump is used to select the main oil passage with higher pressure in the first main oil passage 3 and the second main oil passage 4, the main oil path with higher pressure is introduced into the first chamber 52 of the servo oil cylinder 5 through the oil outlet of the shuttle valve 6, the third damping hole 15 and the first logic valve 7 in sequence (or the main oil path with higher pressure is introduced into the second chamber 53 of the servo oil cylinder 5 through the oil outlet of the shuttle valve 6, the fourth damping hole 16 and the second logic valve 11 in sequence), pressure unloading is carried out, the piston 51 of the servo oil cylinder 5 returns to the middle position, the swash plate in the main pump 2 is further driven to return to the middle position, and finally the displacement of the plunger pump is reset to zero. The reaction speed of the closed plunger pump pressure cut-off can be adjusted by changing the sizes of the third damping hole 15 and the fourth damping hole 16.
During the use, under certain operating mode, for example the frequent positive and negative occasion of motor such as digit control machine tool, accessible the embodiment of the utility model provides a closed plunger pump utilizes external pressure cutting device, pressurizes through the low pressure side cavity in the first cavity 52 or the second cavity 53 of high-pressure oil for servo cylinder 5 piston 51 both sides, utilizes the system high pressure of plunger pump to come balanced control pressure to automatic control discharge capacity returns to zero rapidly, prevents that the plunger pump from damaging.
To sum up, the embodiment of the utility model provides a closed plunger pump, it can utilize external pressure cutting device, when hydraulic fluid port pressure risees suddenly, the motor card is dead, automatic, reliable control discharge capacity returns to zero rapidly, avoids plunger pump and motor permanent damage.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (8)
1. A closed plunger pump, comprising:
a pump housing;
the main pump is arranged in the pump shell and is used for being connected with a driving shaft of an engine, and a swash plate is arranged in the main pump;
the first main oil way is connected with the main pump and is provided with a first pressure measuring port;
the second main oil way is connected with the main pump and is provided with a second pressure measuring port;
the servo oil cylinder is arranged in the pump shell, a piston is arranged in the servo oil cylinder, the piston limits the interior of the servo oil cylinder into a first chamber and a second chamber, and the piston is connected with one end of the swash plate;
a shuttle valve for selecting a high pressure in the first and second main oil passages;
the first logic valve is a two-position four-way valve, a first valve port of the first logic valve is communicated with the first pressure measuring port, a second valve port of the first logic valve is communicated with the interior of the pump shell through a first overflow valve, a third valve port of the first logic valve is communicated with an oil outlet of the shuttle valve, and a fourth valve port of the first logic valve is communicated with the first chamber; when the valve is in a normal position, the four ports of the first logic valve are not communicated, and after the valve is displaced, the first port of the first logic valve is communicated with the second port of the first logic valve, and the third port of the first logic valve is communicated with the fourth port of the first logic valve;
the two ends of the first branch are respectively connected with a first valve port of the first logic valve and a second valve port of the first logic valve, and the first branch is connected with a first damping hole in series;
the first valve port of the first logic valve is communicated with the first pressure measuring port, the second valve port of the first logic valve is communicated with the inside of the pump shell through a first overflow valve, the third valve port of the first logic valve is communicated with the oil outlet of the shuttle valve, and the fourth valve port of the first logic valve is communicated with the first chamber; in a normal position, the four ports of the second logic valve are not communicated, and after displacement, the first port of the second logic valve is communicated with the second port of the second logic valve and the third port of the second logic valve is communicated with the fourth port of the second logic valve;
the two ends of the second branch are respectively connected with the first valve port of the second logic valve and the second valve port of the second logic valve, and the second branch is connected with a second damping hole in series;
the first logic valve, the second logic valve, the first overflow valve and the second overflow valve are all installed outside the pump shell, and the shuttle valve is arranged inside or outside the pump shell.
2. The closed plunger pump according to claim 1, further comprising a third orifice and a fourth orifice, the third orifice being connected in series to a line connecting the third port of the first logic valve and the outlet port of the shuttle valve,
the fourth damping hole is connected in series to a pipeline which communicates the third valve port of the second logic valve with the oil outlet of the shuttle valve.
3. The closed plunger pump according to claim 1, wherein a spring capable of adjusting an opening pressure is provided in each of the first and second relief valves.
4. The closed plunger pump of claim 1 wherein the first logic valve and the second logic valve are both balanced, normally closed logic valves.
5. The closed plunger pump of claim 4 wherein a spring is disposed within each of the first logic valve and the second logic valve for setting a pressure cutoff value.
6. The closed plunger pump according to claim 1, further comprising an oil replenishment pump and a servo valve installed in the pump housing,
the oil replenishing pump is used for being connected with a driving shaft of an engine,
the servo valve is a three-position four-way valve, a first valve port of the servo valve is communicated with the first chamber, a second valve port of the servo valve is communicated with the second chamber, a third valve port of the servo valve is communicated with the inside of the pump shell, and a fourth valve port of the servo valve is communicated with an oil outlet of the oil replenishing pump; and in a normal position, the four valve ports of the servo valve are not communicated, after displacement, the first valve port of the servo valve is communicated with the third valve port of the servo valve, the second valve port of the servo valve is communicated with the fourth valve port of the servo valve, or the first valve port of the servo valve is communicated with the fourth valve port of the servo valve, and the second valve port of the servo valve is communicated with the third valve port of the servo valve.
7. The closed plunger pump according to claim 6, wherein a fifth orifice is connected in series to a pipe connecting the first port of the servo valve and the first chamber, and a sixth orifice is connected in series to a pipe connecting the second port of the servo valve and the second chamber.
8. The closed plunger pump according to claim 6, wherein the fourth port of the servo valve is communicated with the oil outlet of the oil replenishing pump through a control oil path, and a filter is connected in series to the control oil path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922232333.8U CN211202468U (en) | 2019-12-12 | 2019-12-12 | Closed plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922232333.8U CN211202468U (en) | 2019-12-12 | 2019-12-12 | Closed plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211202468U true CN211202468U (en) | 2020-08-07 |
Family
ID=71853605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922232333.8U Active CN211202468U (en) | 2019-12-12 | 2019-12-12 | Closed plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211202468U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530782A (en) * | 2021-07-15 | 2021-10-22 | 中铁工程装备集团有限公司 | Large displacement pump with rapid pressure cut-off protection function and protection method thereof |
| CN115163446A (en) * | 2022-08-17 | 2022-10-11 | 浙江大学 | Servo electric-driven pumping system of concrete pump truck and control method |
-
2019
- 2019-12-12 CN CN201922232333.8U patent/CN211202468U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530782A (en) * | 2021-07-15 | 2021-10-22 | 中铁工程装备集团有限公司 | Large displacement pump with rapid pressure cut-off protection function and protection method thereof |
| CN113530782B (en) * | 2021-07-15 | 2022-07-08 | 中铁工程装备集团有限公司 | Large displacement pump with rapid pressure cut-off protection function and protection method thereof |
| CN115163446A (en) * | 2022-08-17 | 2022-10-11 | 浙江大学 | Servo electric-driven pumping system of concrete pump truck and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8033107B2 (en) | Hydrostatic drive having volumetric flow equalisation | |
| CN211202468U (en) | Closed plunger pump | |
| CN103256265A (en) | Hydrostatic drive system | |
| CN201125403Y (en) | Loading apparatus load sensing energy-saving hydraulic system | |
| KR101675659B1 (en) | Pump control apparatus | |
| CN202031895U (en) | Oil-way system of a mould locking oil cylinder | |
| CN202991688U (en) | Multifunctional integration type hydraulic motor valve group | |
| CN113883116A (en) | Oil drain valve, energy storage device, hydraulic system and operation machine | |
| CN102777438A (en) | Multifunctional integrated valve bank of hydraulic motor | |
| CN106224306B (en) | Hydraulic system with flow-compensated function | |
| CN111108292B (en) | Hydraulic system | |
| CN210034023U (en) | Hydraulic control system of quick-change device | |
| CN208503126U (en) | A kind of repairing switching valve for enclosed and open system switching | |
| CN108533556B (en) | Oil supplementing switching valve for switching closed system and open system and control system | |
| CN202789859U (en) | Hydraulic energy-saving temperature controlling system for loader working equipment | |
| CN110985458B (en) | Multistage differential pressure control hydraulic system | |
| CN212615679U (en) | Unloading control valve | |
| CN212803539U (en) | Electric displacement control system for open circuit variable displacement pump | |
| CN2589425Y (en) | Load sensitive confluent hydraulic system for loader | |
| CN210658519U (en) | Hydraulic motor controller, hydraulic motor assembly and wheel type excavator | |
| CN109139593B (en) | Pilot unloading valve | |
| CN202612234U (en) | Hydraulic system for engineering machinery | |
| US20160069341A1 (en) | Diaphragm Pump Having Position Control | |
| CN218325528U (en) | Floating mechanism hydraulic control system and aerial work platform | |
| CN113530783B (en) | Two-stage pressure control device with unloading function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |