CN113530782B - Large displacement pump with rapid pressure cut-off protection function and protection method thereof - Google Patents
Large displacement pump with rapid pressure cut-off protection function and protection method thereof Download PDFInfo
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- CN113530782B CN113530782B CN202110799770.7A CN202110799770A CN113530782B CN 113530782 B CN113530782 B CN 113530782B CN 202110799770 A CN202110799770 A CN 202110799770A CN 113530782 B CN113530782 B CN 113530782B
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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
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
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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
- F04B51/00—Testing machines, pumps, or pumping installations
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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
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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
- 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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
Abstract
The invention provides a large displacement pump with a rapid pressure cut-off protection function and a protection method thereof, wherein the large displacement pump with the rapid pressure cut-off protection function comprises a closed pump (1), a closed pump displacement control valve (2) and a closed pump working oil port selection valve (3) which are sequentially connected, the large displacement pump with the rapid pressure cut-off protection function further comprises a safety protection circuit, the safety protection circuit comprises a shuttle valve (4) and a monitoring control module (5), and when the outlet pressure of the shuttle valve (4) is greater than the preset pressure, the monitoring control module (5) can cut off a closed pump displacement control oil supply pipeline (31) and enable the closed pump displacement control valve (2) to be changed into a closed state. The large displacement pump with the rapid pressure cut-off protection function comprises a safety protection loop for comparing pressure and controlling oil on-off of displacement, so that the problem that a hydraulic system has safety risks due to overload pressure overshoot of the large displacement pump with the rapid pressure cut-off protection function is solved.
Description
Technical Field
The invention relates to the field of pressure control of large-displacement closed hydraulic pumps, in particular to a large-displacement pump with a quick pressure cut-off protection function and a protection method of the large-displacement pump with the quick pressure cut-off protection function.
Background
The large-displacement closed hydraulic pump is applied to a main driving closed hydraulic system of a shield machine and hydraulic power systems in the field of other engineering machinery. As shown in fig. 1, a closed pump displacement control valve 2 is integrated on a large-displacement closed hydraulic pump (closed pump 1) for controlling the displacement of the pump, and a pump outlet overflow valve 6 (2) is also integrated on the closed pump 1, so that the system is protected from overload. The two pump outlet overflow valves 6 are in a closed state when the hydraulic system works normally, and when the pressure in the oil circuit A or the oil circuit B of the pump is greater than the set pressure of the pump outlet overflow valve 6, the pump outlet overflow valve 6 can be opened to overflow, so that the safety of the system is ensured.
The overflow valve integrated on the pump has the problem of system pressure overshoot by the scheme of system overload protection, namely when a closed pump runs under the working condition of high pressure and large flow, if the load suddenly increases, the system pressure can suddenly rise, at the moment, the pump outlet overflow valve 6 of the pump is opened to overflow oil liquid to the oil tank, but because the flow of the pump outlet is very large, the through-flow capacity of the pump outlet overflow valve 6 is limited, the redundant oil liquid cannot be instantly overflowed to the oil tank, the system pressure is continuously increased, the system pressure exceeds the preset safety pressure of the system, and danger is caused.
Disclosure of Invention
In order to solve the problem of insufficient overload protection capability of an overflow valve at the outlet of a pump, the invention provides a large displacement pump with a rapid pressure cut-off protection function and a protection method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a big discharge pump with quick pressure cuts off protect function, is including the closed pump, closed pump discharge capacity control valve and the closed pump working fluid port selection valve that connect gradually, and the export of closed pump is outer to be connected with first hydraulic supply pipeline and second hydraulic supply pipeline, and closed pump working fluid port selection valve is outer to be connected with closed pump discharge capacity control oil supply pipeline, big discharge pump with quick pressure cuts off protect function still includes the safety protection return circuit, the safety protection return circuit contains shuttle valve and monitor control module, and two entrances and first hydraulic supply pipeline and second hydraulic supply pipeline one-to-one of shuttle valve are connected, and when the outlet pressure of shuttle valve was greater than preset pressure, monitor control module can cut off closed pump discharge capacity control oil supply pipeline to make closed pump discharge capacity control valve change closed state into.
A protection method of a large displacement pump with a rapid pressure cut-off protection function, which adopts the large displacement pump with the rapid pressure cut-off protection function, comprises the following steps: when the outlet pressure of the shuttle valve is greater than the preset pressure, the monitoring control module cuts off the closed pump displacement control oil supply pipeline and enables the closed pump displacement control valve to be changed into a closed state.
The invention has the beneficial effects that: the large-displacement pump with the rapid pressure cut-off protection function comprises a safety protection loop for pressure comparison and displacement control oil on-off, and the closed pump displacement is instantaneously set to zero when the system is overloaded, so that the outlet pressure of the pump is rapidly cut off, and the problem that the overflow valve integrated on the closed pump cannot rapidly stabilize the system pressure and damage an actuating mechanism and a hydraulic system due to overshoot is solved. In addition, the safety protection circuit is simple in structure and obvious in effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a prior art closed hydraulic system.
Fig. 2 is a schematic diagram of the general concept of a large displacement pump with a rapid pressure cutoff protection function according to the present invention.
Fig. 3 is a schematic diagram of a large displacement pump with a rapid pressure cutoff protection function according to the present invention in example 1.
Fig. 4 is a schematic diagram of a large displacement pump with a fast pressure cut-off protection function according to the present invention in example 2.
Fig. 5 is a schematic diagram of a large displacement pump with a fast pressure cut-off protection function according to the present invention in example 3.
1. A closed pump; 2. a closed pump displacement control valve; 3. a closed pump working oil port selector valve; 4. a shuttle valve; 5. a monitoring control module; 6. an overflow valve at the outlet of the pump; 7. an oil tank; 8. an oil return line;
11. a first hydraulic supply line; 12. a second hydraulic supply line;
31. a closed pump displacement control oil supply line;
51. a pressure setting valve; 52. a shut-off operation valve; 53. a pressure sensor; 54. a control unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A large displacement pump with a rapid pressure cut-off protection function comprises a closed pump 1, a closed pump displacement control valve 2 and a closed pump working oil port selection valve 3 which are sequentially connected, wherein an outlet of the closed pump 1 is externally connected with a first hydraulic supply pipeline 11 and a second hydraulic supply pipeline 12, the closed pump working oil port selection valve 3 is externally connected with a closed pump displacement control oil supply pipeline 31, the large displacement pump with the rapid pressure cut-off protection function further comprises a safety protection circuit, the safety protection circuit comprises a shuttle valve 4 and a monitoring control module 5, two inlets of the shuttle valve 4 are correspondingly connected with the first hydraulic supply pipeline 11 and the second hydraulic supply pipeline 12 one by one, when the outlet pressure of the shuttle valve 4 is greater than a preset pressure, the monitoring control module 5 can cut off the closed pump displacement control oil supply pipeline 31 and enable the closed pump displacement control valve 2 to be changed into a closed state, as shown in fig. 2.
The general concept of the invention is to add a safety protection circuit on the basis of the prior art, the safety protection circuit comprises a shuttle valve 4 and a monitoring control module 5 which are connected in sequence, the shuttle valve 4 is used for collecting pressure values in a first hydraulic supply pipeline 11(A oil circuit) and a second hydraulic supply pipeline 12(B oil circuit), when the outlet pressure of the shuttle valve 4 is greater than a preset pressure, the monitoring control module 5 can cut off the control oil supply of a closed-type pump displacement control oil supply pipeline 31, namely the closed-type pump displacement control oil supply pipeline 31 stops supplying oil to a closed-type pump displacement control valve 2, so that two ends (a first displacement control interface and a second displacement control interface) of the closed-type pump displacement control valve 2 are communicated with an oil tank 7, and the closed-type pump displacement control valve 2 is a normally closed valve, thereby realizing the swinging of a pump swing angle to the direction of the minimum displacement until the displacement is zero.
In this embodiment, the closed pump working oil port selector valve 3 is a three-position four-way electromagnetic directional valve, an interface a of the three-position four-way electromagnetic directional valve is connected with a first displacement control interface X2 of the closed pump displacement control valve 2, an interface B of the three-position four-way electromagnetic directional valve is connected with a second displacement control interface X1 of the closed pump displacement control valve 2, and an interface T of the three-position four-way electromagnetic directional valve is communicated with the oil return pipeline 8. The closed pump working oil port selector valve 3 is integrated on the closed pump 1, and the closed pump 1 is further integrated with 2 pump outlet overflow valves 6.
The following describes a method for protecting a large displacement pump with a rapid pressure cut-off protection function, which uses the large displacement pump with the rapid pressure cut-off protection function, and comprises the following steps:
when the outlet pressure of the shuttle valve 4 is greater than the preset pressure, the monitoring control module 5 cuts off the closed-pump displacement control oil supply line 31 and transitions the closed-pump displacement control valve 2 to the closed state.
A closed hydraulic system including the large displacement pump with the rapid pressure cut-off protection described above is described below.
A shield tunneling machine including the large displacement pump with a rapid pressure cutoff protection function described above will now be described. For example, the large displacement pump with the rapid pressure cut-off protection function can be a main drive large displacement pump with the rapid pressure cut-off protection function in the shield machine, and the large displacement pump with the rapid pressure cut-off protection function can also be a screw delivery large displacement pump with the rapid pressure cut-off protection function in the shield machine. The large displacement pump with the rapid pressure cut-off protection function can be applied to a shield machine and other engineering machinery. Several specific ways in which the monitoring control module 5 may be implemented in the described large displacement pump with rapid pressure cutoff protection are described below.
Example 1
In the present embodiment, the monitor control module 5 has a pressure setting valve 51 and a cutoff operation valve 52, the preset pressure being set by the pressure setting valve 51, and the cutoff operation valve 52 is capable of cutting off the closed-type pump displacement control oil supply line 31 so that the closed-type pump displacement control oil supply line 31 cannot supply oil to the closed-type pump displacement control valves 2 to control the closed-type pump displacement control valves 2, as shown in fig. 3.
In this embodiment, the pressure setting valve 51 is a sequence valve, and the shutoff operation valve 52 is a two-position two-way hydraulically operated directional valve, which are both prior art products. The inlet of the sequence valve is connected with the outlet of the shuttle valve 4, the outlet of the sequence valve is connected with the hydraulic reversing interface of the two-position two-way hydraulic reversing valve, the A interface of the two-position two-way hydraulic reversing valve is connected with the P interface of the three-position four-way electromagnetic reversing valve through the first section of the closed pump displacement control oil supply pipeline 31, the B interface of the two-position two-way hydraulic reversing valve is closed, the P interface of the two-position two-way hydraulic reversing valve is connected with the second section of the closed pump displacement control oil supply pipeline 31, and the T interface of the two-position two-way hydraulic reversing valve is communicated with the oil return pipeline 8, as shown in figure 3.
The operation of the large displacement pump with the rapid pressure cut-off protection function described in this embodiment will be described below.
The pressure setting valve 51 is used for setting the overload pressure of the system, the valve can be set according to the opening pressure required by the system safety pressure setting, and when the system pressure reaches the safety pressure value (namely, the preset pressure), the pressure setting valve 51 is opened. Closed pump displacement control oil supply pipeline 31(PST) inner closed pump displacement control oil sequentially passes through a two-position two-way reversing valve (a cut-off operation valve 52) and a three-position four-way electromagnetic reversing valve (a closed pump working oil port selection valve 3), acts on a second displacement control interface X1 and a first displacement control interface X2 of a closed pump displacement control valve 2, when system pressure exceeds preset pressure of a pressure setting valve 51, the pressure setting valve 51 is opened, pressure oil discharged from an outlet of the pressure setting valve 51 pushes the two-position two-way hydraulic reversing valve (the cut-off operation valve 52) to reverse, the cut-off operation valve 52 is closed, the closed pump displacement control oil supply pipeline 31 does not supply oil to the closed pump working oil port selection valve 3 any more, at the moment, control pressure oil on the closed pump displacement control valve 2 is communicated with an oil tank 7, the control oil pressure is reduced to zero, the closed pump displacement control valve 2 is reset, the displacement of the closed pump 1 is adjusted towards a small displacement direction to maintain the set pressure of the system, until the closed pump displacement control valve 2 is closed, the displacement of the closed pump 1 is zero.
Example 2
In the present embodiment, the monitoring control module 5 includes a pressure sensor 53, a control unit 54 and a shut-off operation valve 52, the pressure sensor 53 is connected to an outlet of the shuttle valve 4, the pressure sensor 53 can send the collected outlet pressure of the shuttle valve 4 to the control unit 54, the control unit 54 can be an upper computer, the preset pressure is stored in the control unit 54, and the control unit 54 can control the shut-off operation valve 52 to shut off the closed-type pump displacement control oil supply line 31, as shown in fig. 4.
In this embodiment, the cut-off operation valve 52 is a two-position three-way electromagnetic directional valve, the control unit 54 is connected to an electromagnet of the two-position three-way electromagnetic directional valve, an a interface of the two-position three-way electromagnetic directional valve is connected to a P interface of the three-position four-way electromagnetic directional valve through a first section of the closed pump displacement control oil supply line 31, a B interface of the two-position three-way electromagnetic directional valve is closed, the P interface of the two-position three-way electromagnetic directional valve is connected to a second section of the closed pump displacement control oil supply line 31, and a T interface of the two-position three-way electromagnetic directional valve is communicated to the oil return line 8.
The operation of the large displacement pump with the rapid pressure cut-off protection function described in this embodiment will be described below.
The pressure sensor 53 can detect the system pressure in real time and feed back the system pressure to an upper computer (control unit 54) system, and the upper computer can set and store the safety pressure value (i.e. the preset pressure) of the system. When the system pressure reaches a set safe pressure value, the upper computer sends a power supply signal to an electromagnet of the two-position three-way reversing valve (namely the cut-off operation valve 52), the two-position three-way reversing valve pushes the spring to move rightwards after being electrified, so that the left position of the two-position three-way reversing valve works, the two-position three-way reversing valve cuts off the closed pump displacement control oil supply pipeline 31, control oil of the closed pump displacement control valve 2 is communicated with the oil tank 7, and at the moment, the swing angle of the closed pump 1 swings towards the small displacement direction until the displacement is zero.
Example 3
In this embodiment, the monitoring control module 5 includes a pressure sensor 53 and a control unit 54, the pressure sensor 53 is connected to an outlet of the shuttle valve 4, the control unit 54 is connected to an electromagnet of the three-position four-way electromagnetic directional valve, the pressure sensor 53 is capable of sending the collected outlet pressure of the shuttle valve 4 to the control unit 54, the preset pressure is stored in the control unit 54, and the control unit 54 is capable of controlling the closed pump working port selector valve 3 to cut off the closed pump displacement control oil supply line 31, as shown in fig. 5.
The operation of the large displacement pump with the rapid pressure cut-off protection function described in this embodiment will be described below.
The pressure sensor 53 can detect the system pressure in real time and feed back the system pressure to an upper computer (control unit 54), and the upper computer can set and store the safety pressure value (i.e., the preset pressure) of the system. When the system pressure reaches the set safe pressure value, the upper computer sends out a power-off signal to the electromagnet of the three-position four-way reversing valve (the closed pump working oil port selection valve 3), at the moment, the closed pump working oil port selection valve 3 stops working, so that the closed pump displacement control oil supply pipeline 31 is cut off, the closed pump displacement control oil supply pipeline 31 stops supplying oil, the oil tanks 7 are communicated with the two ends of the closed pump displacement control valve 2, the closed pump displacement control valve 2 is reset and closed under the action of the spring force, the swing angle of the closed pump 1 swings to the small displacement direction, and the displacement of the closed pump 1 becomes zero. At this time, the outlet pressure of the closed pump 1 is stabilized at the safety pressure value preset in the closed system.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.
Claims (9)
1. A large-displacement pump with a rapid pressure cut-off protection function comprises a closed pump (1), a closed pump displacement control valve (2) and a closed pump working oil port selection valve (3) which are sequentially connected, wherein a first hydraulic supply pipeline (11) and a second hydraulic supply pipeline (12) are externally connected to an outlet of the closed pump (1), the closed pump displacement control valve (2) is a normally-closed valve, a closed pump displacement control oil supply pipeline (31) is externally connected to the closed pump working oil port selection valve (3), the closed pump working oil port selection valve (3) is a three-position four-way electromagnetic reversing valve, an interface A of the three-position four-way electromagnetic reversing valve is connected with a first displacement control interface of the closed pump displacement control valve (2), an interface B of the three-position four-way electromagnetic reversing valve is connected with a second displacement control interface of the closed pump displacement control valve (2), and an interface T of the three-position four-way electromagnetic reversing valve is communicated with an oil return pipeline (8), the large displacement pump with the rapid pressure cut-off protection function is characterized by further comprising a safety protection circuit, wherein the safety protection circuit comprises a shuttle valve (4) and a monitoring control module (5), two inlets of the shuttle valve (4) are correspondingly connected with a first hydraulic supply pipeline (11) and a second hydraulic supply pipeline (12) one by one, and when the outlet pressure of the shuttle valve (4) is larger than a preset pressure, the monitoring control module (5) can cut off a closed pump displacement control oil supply pipeline (31) and enable the closed pump displacement control valve (2) to be changed into a closed state.
2. The large displacement pump with rapid pressure cut-off protection as claimed in claim 1, characterized in that the monitoring control module (5) contains a pressure setting valve (51) and a cut-off operation valve (52), the preset pressure being set by the pressure setting valve (51), the cut-off operation valve (52) being capable of cutting off the closed pump displacement control oil supply line (31).
3. The large displacement pump with rapid pressure cutoff protection as claimed in claim 2 characterized in that the pressure setting valve (51) is a sequence valve and the cutoff operation valve (52) is a two-position two-way hydraulically operated directional valve.
4. The large displacement pump with rapid pressure cut-off protection function according to claim 3, characterized in that the inlet of the sequence valve is connected with the outlet of the shuttle valve (4), the outlet of the sequence valve is connected with the hydraulic reversing interface of the two-position two-way hydraulic reversing valve, the A interface of the two-position two-way hydraulic reversing valve is connected with the P interface of the three-position four-way electromagnetic reversing valve through the first section of the closed pump displacement control oil supply pipeline (31), the B interface of the two-position two-way hydraulic reversing valve is closed, the P interface of the two-position two-way hydraulic reversing valve is connected with the second section of the closed pump displacement control oil supply pipeline (31), and the T interface of the two-position two-way hydraulic reversing valve is communicated with the oil return pipeline (8).
5. The large displacement pump with rapid pressure cut-off protection according to claim 1, characterized in that the monitoring control module (5) contains a pressure sensor (53), a control unit (54) and a cut-off operation valve (52), the pressure sensor (53) is connected with the outlet of the shuttle valve (4), the pressure sensor (53) can send the collected outlet pressure of the shuttle valve (4) to the control unit (54), the preset pressure is stored in the control unit (54), and the control unit (54) can control the cut-off operation valve (52) to cut off the closed pump displacement control oil supply line (31).
6. The large displacement pump with a rapid pressure cut-off protection function according to claim 5, characterized in that the cut-off operation valve (52) is a two-position three-way electromagnetic directional valve, the control unit (54) is connected with an electromagnet of the two-position three-way electromagnetic directional valve, an A interface of the two-position three-way electromagnetic directional valve is connected with a P interface of the three-position four-way electromagnetic directional valve through a first section of a closed pump displacement control oil supply line (31), a B interface of the two-position three-way electromagnetic directional valve is closed, the P interface of the two-position three-way electromagnetic directional valve is connected with a second section of the closed pump displacement control oil supply line (31), and a T interface of the two-position three-way electromagnetic directional valve is communicated with the oil return line (8).
7. The large displacement pump with the function of rapid pressure cut-off protection according to claim 1, characterized in that the monitoring control module (5) comprises a pressure sensor (53) and a control unit (54), the pressure sensor (53) is connected with the outlet of the shuttle valve (4), the control unit (54) is connected with the electromagnet of the three-position four-way electromagnetic directional valve, the pressure sensor (53) can send the collected outlet pressure of the shuttle valve (4) to the control unit (54), the preset pressure is stored in the control unit (54), and the control unit (54) can control the closed pump working port selector valve (3) to cut off the closed pump displacement control oil supply line (31).
8. The large displacement pump with the function of rapid pressure cut-off protection according to claim 1, characterized in that the closed pump working port selector valve (3) is integrated on the closed pump (1), and the closed pump (1) is further integrated with a pump outlet overflow valve (6).
9. A method for protecting a large displacement pump with a rapid pressure cut-off protection function, which is characterized in that the method for protecting the large displacement pump with the rapid pressure cut-off protection function adopts the large displacement pump with the rapid pressure cut-off protection function of claim 1, and comprises the following steps:
when the outlet pressure of the shuttle valve (4) is greater than the preset pressure, the monitoring control module (5) cuts off the closed pump displacement control oil supply line (31) and enables the closed pump displacement control valve (2) to be changed into a closed state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110799770.7A CN113530782B (en) | 2021-07-15 | 2021-07-15 | Large displacement pump with rapid pressure cut-off protection function and protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110799770.7A CN113530782B (en) | 2021-07-15 | 2021-07-15 | Large displacement pump with rapid pressure cut-off protection function and protection method thereof |
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| CN113530782B true CN113530782B (en) | 2022-07-08 |
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| CN113530782A (en) | 2021-10-22 |
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