CN117212091A

CN117212091A - Graphene pumping system and control method

Info

Publication number: CN117212091A
Application number: CN202310979648.7A
Authority: CN
Inventors: 黄海; 刘兆平; 张雷健; 徐荣锋
Original assignee: Ningbo Graphene Innovation Center Co Ltd
Current assignee: Ningbo Graphene Innovation Center Co Ltd
Priority date: 2023-08-04
Filing date: 2023-08-04
Publication date: 2023-12-12

Abstract

The invention relates to a graphene pumping system and a control method, wherein the pumping system comprises a high-pressure pump, a feed pump, a pressure transmission cylinder and a controller, wherein a rodless piston is arranged in the pressure transmission cylinder, the rodless piston divides an inner cavity of the pressure transmission cylinder into a slurry cavity and a high-pressure water cavity, and two ends of the pressure transmission cylinder are respectively provided with a feed inlet and a discharge outlet which are communicated with the slurry cavity, and a liquid inlet and a liquid discharge outlet which are communicated with the high-pressure water cavity; the output end of the high-pressure pump is communicated with the high-pressure water cavity through a liquid inlet, the output end of the feed pump is communicated with the slurry cavity through a feed inlet, and electric control valves are respectively arranged on the feed inlet, the discharge outlet, the liquid inlet and the liquid outlet. The invention provides a graphene pumping system and a control method, which can pressurize fluid containing solid particles to ultra-high pressure exceeding 250MPA.

Description

Graphene pumping system and control method

Technical Field

The invention relates to the technical field of slurry pumping systems, in particular to a graphene pumping system and a control method.

Background

The liquid pump has various structural forms, but the ultrahigh pressure liquid pump with the pressure of more than 100MPa has the structural form of a plunger pump. The highest pressure of the ultrahigh-pressure liquid pumps available on the market at present is generally around 600MPa, more preferably 400MPa, such as the ultrahigh-pressure pump for a water jet, but the existing ultrahigh-pressure liquid pump can provide a pressure exceeding 250MPa on the premise that pure liquid is used as a pumping medium, such as the pressurization of pure water. If the pumping medium is replaced with a fluid with solid particles, the existing plunger pump cannot provide a pressure exceeding 250MPA, and the service life of the plunger pump is greatly reduced, and the service life of the plunger pump is inversely proportional to the magnitude of the fluid working pressure. The reason is that the inside of the plunger pump adopts a one-way valve structure, and solid particles contained in the fluid in the process of reciprocating movement of the one-way valve can be accumulated at the sealing opening of the one-way valve when the one-way valve reciprocates in and out of the one-way valve, so that the one-way valve is difficult to realize normal sealing, and therefore, the existing plunger pump cannot be used for pressurizing the fluid containing the solid particles to the same or similar pressure value as a pure liquid medium, and the pressure value is far lower than 250MPA required by the ultra-high pressure fluid. And how to pressurize the fluid containing solid particles to more than 250MPA or even higher pressure has wide application prospect in the fields of biology, medicine, chemical industry and the like. Taking graphene slurry used in the field of graphene as an example, the slurry contains graphene particles, and the currently known ultrahigh-pressure liquid pump available in the market cannot meet the ultrahigh-pressure requirement of more than 250MPA required by the existing graphene industry, and cannot meet the high requirement that the pressure of the graphene slurry can be further increased to more than 350MPa in the preparation process of small-size graphene.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent: a graphene pumping system is provided that is capable of pressurizing a fluid containing solid particles to an ultra-high pressure in excess of 250 MPA.

To this end, an object of the present invention is to propose a graphene pumping system comprising:

a high pressure pump for pumping a liquid medium;

a feed pump for pumping the slurry;

the pressure transmission cylinder is internally provided with a rodless piston, the rodless piston is in sliding fit with the pressure transmission cylinder and divides the inner cavity of the pressure transmission cylinder into a slurry cavity and a high-pressure water cavity, two ends of the pressure transmission cylinder are respectively provided with a feed inlet and a discharge outlet which are communicated with the slurry cavity, and a liquid inlet and a liquid outlet which are communicated with the high-pressure water cavity, the output end of the high-pressure pump is communicated with the liquid inlet, the output end of the feed pump is communicated with the feed inlet, the pressure transmission cylinder is provided with a feed state for pumping slurry towards the slurry cavity and a discharge state for driving the slurry in the slurry cavity to be pumped out from the discharge outlet, and the feed inlet, the discharge outlet, the liquid inlet and the liquid outlet are respectively provided with an electric control valve;

the feeding monitoring assembly is arranged on a connecting pipeline between the feeding pump and the feeding port and used for monitoring the position of the rodless piston when the pressure transmission cylinder is in a feeding state, and the discharging monitoring assembly is arranged on a connecting pipeline communicated with the discharging port and used for monitoring the position of the rodless piston when the pressure transmission cylinder is in a discharging state;

And the controller is used for controlling the start and stop of the high-pressure pump and the feeding pump and the opening and closing of each electric control valve, and the feeding monitoring component and the discharging monitoring component are respectively connected with the controller by signals.

The technical scheme has the following advantages or beneficial effects: firstly, the high-pressure water cavity in the pressure transmission cylinder is pressurized by using the existing water jet knife high-pressure pump and the pressure is transmitted to the slurry cavity through the rodless piston, so that the slurry pumped by the feed pump can be further pressurized in the slurry cavity, the slurry pressure of the discharge port is equal to or close to the pressure value of pure water pumped by the high-pressure pump directly, and finally the ultrahigh-pressure slurry exceeding 250MPA is obtained.

According to one example of the invention, the pressure transfer cylinders are multiple, the discharge port of each pressure transfer cylinder is communicated with the discharge main pipe through a corresponding discharge branch pipe, and each pressure transfer cylinder is arranged in a discharge state during operation. Multiple pressure transfer cylinders can change the periodic slurry delivery of a single pressure transfer cylinder to continuous slurry delivery.

According to one example of the invention, the pressure transmitting cylinders are two.

According to one example of the invention, the feed inlets of the two pressure transmission cylinders are communicated with the output end of the feed pump through a tee joint, the liquid inlets of the two pressure transmission cylinders are communicated with the output end of the high-pressure pump through a tee joint, the two discharging branch pipes are communicated with the discharging main pipe through a tee joint, and the two pressure transmission cylinders are alternately in a discharging state in the working process.

According to one example of the invention, the feeding monitoring component is a feeding pressure transmitter, the feeding pressure transmitter is located on a connecting pipeline between the output end of the feeding pump and the tee joint, the discharging monitoring component is a discharging pressure transmitter, the discharging pressure transmitter is located on the discharging main pipe, and the feeding pressure transmitter and the discharging pressure transmitter are respectively connected with the controller in a signal mode. The controller can control the pressure transfer cylinder to automatically switch between a feeding state and a discharging state through detection signals of the pressure transmitter.

According to one example of the invention, the feeding monitoring component is a flowmeter, the flowmeter is located on a connecting pipeline between the output end of the feeding pump and the tee joint, the discharging monitoring component is a discharging pressure transmitter, the discharging pressure transmitter is located on the discharging main pipe, and the flowmeter and the discharging pressure transmitter are respectively connected with the controller in a signal mode. The feeding pressure transmitter is replaced by the flowmeter, so that the rodless piston can be controlled to stop after enough slurry is filled into the slurry cavity through accurate feeding flow measurement, and the rodless piston is prevented from being in hard contact with the right end of the inner cavity of the pressure transmission cylinder after exceeding a feeding stroke.

According to one example of the invention, the flow Q1 of the slurry pumped from the feed pump into the slurry chamber when the pressure transfer cylinder is in the feed state is greater than or equal to the flow Q2 of the slurry pumped from the discharge port when the pressure transfer cylinder is in the discharge state. The flow of the slurry pumped by the slurry cavity is larger than the flow of the slurry pumped by the slurry cavity, so that the pressure transfer cylinder in the feeding state can finish the slurry supplementation before the pressure transfer cylinder in the discharging state, and the problem of intermittent pumped slurry caused by the fact that the slurry cavity 2 is not filled with the slurry can be avoided.

According to one example of the invention, the number of the pressure transfer cylinders is three, two of the pressure transfer cylinders are common pressure transfer cylinders, and the remaining one pressure transfer cylinder is a standby pressure transfer cylinder, and each electric control valve at two ends of the standby pressure transfer cylinder is in a normally closed state.

According to one example of the invention, the rodless piston comprises a piston base block, a left sealing pressing plate, a right sealing ring and a left sealing ring, wherein the piston base block is in sliding fit with the inner side wall of the inner cavity of the pressure transmission cylinder, the left sealing pressing plate and the right sealing pressing plate are respectively fixed with two ends of the piston base block and form annular grooves with the piston base block in a surrounding manner, and the right sealing ring and the left sealing ring are axially limited in the corresponding annular grooves.

The present invention aims to solve at least one of the technical problems in the related art to some extent: a control method of ultra-high pressure slurry pumping is provided, which is capable of pressurizing a fluid containing solid particles to an ultra-high pressure exceeding 250MPA while making a process of pumping out the ultra-high pressure slurry continuous.

To this end, an object of the present invention is to provide a control method of a graphene pumping system, including the graphene pumping system, the control method including the following steps:

s1, closing a liquid inlet and a liquid outlet on each pressure transmission cylinder, and opening each liquid inlet and each liquid outlet;

s2, starting a feed pump to enable slurry to be filled into slurry cavities of the pressure transmission cylinders from a feed inlet;

s3, closing a feed port and a liquid outlet on each pressure transmission cylinder;

s4, starting the high-pressure pump;

s5, the controller controls the first pressure transmission cylinder to be switched to a discharging state, so that a liquid inlet and a liquid outlet of the first pressure transmission cylinder are opened, the liquid inlet and the liquid outlet are kept closed, and slurry in a slurry cavity of the first pressure transmission cylinder is pumped out from the liquid outlet;

s6, a discharge pressure transmitter gives a first detection signal according to a pressure detection value in a slurry cavity of the first pressure transmission cylinder, a controller receives the first detection signal and controls the first pressure transmission cylinder to switch to a feeding state according to the first detection signal, so that a feed inlet and a liquid outlet of the first pressure transmission cylinder are opened, a liquid inlet and a liquid outlet are closed at the same time, and a feed pump pumps slurry into the slurry cavity;

S7, the feeding pressure transmitter gives a second detection signal according to a pressure detection value in a slurry cavity of the first pressure transmission cylinder, and the controller receives the second detection signal and controls the closing of a feeding port and a liquid discharge port of the first pressure transmission cylinder according to the second detection signal;

s8, when the controller receives a first detection signal and controls a previous pressure transfer cylinder to be switched to a feeding state according to the first detection signal, the controller synchronously controls a next pressure transfer cylinder to be switched to a discharging state, so that a liquid inlet and a liquid outlet of the next pressure transfer cylinder are opened, and the liquid inlet and the liquid outlet are kept closed;

s9, if the controller does not receive a stop instruction, the two pressure transmission cylinders sequentially circulate the steps S6-S8; and if the controller receives the stop instruction, closing the feed pump and the discharge ports of the two pressure transmission cylinders.

The technical scheme has the following advantages or beneficial effects: firstly, adopt above-mentioned graphite alkene pumping system to make it have the advantage that graphite alkene pumping system possessed, secondly, let a plurality of pressure transfer cylinders in orderly switching of ejection of compact state and feeding state through the controller for the super high pressure thick liquids after the pressure boost can be carried to the thick liquids processing equipment of next process in succession and steady.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a graphene pumping system of the present invention having one pressure transfer cylinder.

Fig. 2 is a schematic structural diagram of a graphene pumping system of the present invention having two pressure transfer cylinders.

Fig. 3 is a schematic structural view of a graphene pumping system of the present invention having three pressure transfer cylinders.

Fig. 4 is a schematic view of the structure of the pressure transmitting cylinder of the present invention.

Fig. 5 is an enlarged partial schematic view of the area "a" in fig. 4.

Fig. 6 is an enlarged partial schematic view of the area "B" in fig. 4.

Fig. 7 is a schematic view of the configuration of the feed monitoring assembly of fig. 2 using a flow meter.

100 parts of a high-pressure pump; 200. a feed pump; 300. a pressure transmitting cylinder; 400. a controller; 500. slurry processing equipment;

1. a rodless piston; 1.1, a piston base block; 1.2, a left sealing pressing plate; 1.3, right sealing pressing plate; 1.4, a left sealing ring; 1.5, a right sealing ring; 2. a slurry chamber; 3. a high pressure water chamber; 4. a feed inlet; 5. a discharge port; 6. a liquid inlet; 7. a liquid outlet; 8.1, a first electric control valve; 8.2, a second electric control valve; 8.3, a third electric control valve; 8.4, a fourth electric control valve; 9. a discharge branch pipe; 10. a discharging main pipe; 11. a tee joint; 12. a tee joint; 13. a tee joint; 14. a feed pressure transmitter; 15. a discharge pressure transmitter; 16. a charging barrel; 17. a water tank; 18. a water pumping port; 19. a pump nozzle; 20. a material pumping port; 21. a pump port; 22. a liquid inlet branch pipe; 23. a liquid inlet main pipe; 24. a feed manifold; 25. a feed header; 26. a pressure release valve; 27. a flow meter.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

A graphene pumping system and a control method according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings.

The invention provides a graphene pumping system, which is shown in fig. 1-3, and comprises a controller 400, a charging barrel 16, a water tank 17, a high-pressure pump 100, a feed pump 200, at least one pressure transmission cylinder 300, a feeding monitoring component and a discharging monitoring component.

The bowl 16 is configured to hold slurry.

The water tank 17 is arranged for containing a liquid medium.

The high-pressure pump 100 has a water suction port 18 and a water pumping port 19, and the high-pressure pump 100 is configured to pump out the liquid medium from the water pumping port 19 after pressurizing the liquid medium through the water suction port 18. The liquid medium in this embodiment may be from an external liquid supply line that communicates directly with the pumping port 18 of the high pressure pump 100, thereby continuously supplying the high pressure pump 100 with liquid medium; or the high-pressure pump 100 is arranged to pump out the liquid medium from the water tank 17 through the water suction port 18 and to pump out the liquid medium from the water suction port 19 after pressurizing the liquid medium. Further, the high-pressure pump 100 is preferably a high-pressure pump for a water jet.

The feed pump 200 has a suction port 20 and a pump port 21, and the feed pump 200 is configured to pump slurry from the bucket 16 through the suction port 20 and pump the slurry out of the pump port 21 after pressurizing the slurry.

The pressure transmission cylinder 300 is internally provided with a rodless piston 1, the rodless piston 1 is in sliding fit with the inner cavity of the pressure transmission cylinder 300 and divides the inner cavity of the pressure transmission cylinder 300 into a slurry cavity 2 and a high-pressure water cavity 3, the inner cavity of the pressure transmission cylinder 3 is used as a piston cavity, the rodless piston 1 does reciprocating piston motion in the piston cavity, so that the slurry cavity 2 and the high-pressure water cavity 3 are alternately enlarged or reduced, and two ends of the pressure transmission cylinder 300 are respectively provided with a feed port 4 and a discharge port 5 which are communicated with the slurry cavity 2, and a feed port 6 and a discharge port 7 which are communicated with the high-pressure water cavity 3. Referring to fig. 1-3, the left end of the pressure transmission cylinder 300 is provided with a feed inlet 4 and a discharge outlet 5, the feed inlet 4 and the discharge outlet 5 are respectively communicated with the slurry cavity 2, the right end of the pressure transmission cylinder 300 is provided with a liquid inlet 6 and a liquid outlet 7, and the liquid inlet 6 and the liquid outlet 7 are respectively communicated with the high-pressure water cavity 3.

The water pumping port 19 of the high-pressure pump 100 is communicated with the liquid inlet 6 on the pressure transmission cylinder 300, and is further communicated with the high-pressure water cavity 3 of the pressure transmission cylinder 300 through the liquid inlet 6; the pump port 21 of the feed pump 200 is communicated with the feed port 4 of the pressure transmission cylinder 300, and is further communicated with the slurry cavity 2 of the pressure transmission cylinder 300 through the feed port 4; the pressure transmission cylinder 300 is provided with a plurality of electric control valves, the electric control valves comprise a first electric control valve 8.1 corresponding to the feed inlet 4, a second electric control valve 8.2 corresponding to the discharge outlet 5, a third electric control valve 8.3 corresponding to the liquid inlet 6 and a fourth electric control valve 8.4 corresponding to the liquid outlet 7, and the opening and closing states of the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7 are related to the opening and closing states of the electric control valves corresponding to the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7.

The feeding monitoring assembly and the discharging monitoring assembly are arranged on a connecting pipeline between the feeding pump 100 and the feeding port 4 and are used for monitoring the right-side time position of the rodless piston 1 in the pressure transmission cylinder 300, namely when the pressure transmission cylinder 300 is in a feeding state, the pressure difference on two sides of the rodless piston 1 drives the rodless piston 1 to move towards the right-side position of the high-pressure water cavity 3, and the feeding monitoring assembly can acquire the position of the rodless piston 1 in the feeding state; similarly, the discharge monitoring component is disposed on a connection pipeline that is communicated with the discharge port 5, and is used for monitoring the left time position of the rodless piston 1 in the pressure transfer cylinder 300, that is, when the pressure transfer cylinder 300 is in a discharge state, the pressure difference on two sides of the rodless piston 1 drives the rodless piston 1 to move towards the left side position where the slurry cavity 2 is located, and the position of the rodless piston 1 in the discharge state can be obtained through the discharge monitoring component.

The discharge port 5 of the pressure transmission cylinder 300 is connected to a slurry processing device 500, where the slurry processing device 500 refers to a device or apparatus for a procedure to which the pressurized slurry is to be fed, and includes, but is not limited to, a homogenizing valve in a homogenizer.

The controller 400 is respectively connected with the high-pressure pump 100, the feed pump 200 and the electric control valves 8 in a signal manner, and is used for controlling the start and stop of the high-pressure pump 100 and the feed pump 200 and the opening and closing of the electric control valves, and the feed monitoring component and the discharge monitoring component are respectively connected with the controller in a signal manner.

The slurry in this embodiment refers to a fluid with particles, such as graphene slurry in the graphene field, a medicament containing macromolecular particles in the biopharmaceutical field, and various slurries containing solid particles in the chemical field.

The liquid medium in this embodiment refers to various liquids, such as water, aqueous solution, oil, etc.

In the above-described embodiment, the drain port 7 of the pressure transmitting cylinder 300 is communicated with the water tank 17, so that the liquid medium discharged from the pressure transmitting cylinder 300 can be collected, and the liquid medium recovered in the water tank 17 can be recycled after being drawn again by the high-pressure pump 100 based on the process requirements. Preferably, the liquid medium discharged from the drain port 7 may be filtered by the liquid medium before being recovered in the water tank 17, and the filtering apparatus may be any conventional filtering apparatus in the art.

In some embodiments, the number of pressure transfer cylinders 300 is one, see fig. 1, including a controller 400, a bowl 16, a water tank 17, a high pressure pump 100, a feed pump 200, and one pressure transfer cylinder 300. The water pumping port 19 of the high-pressure pump 100 is communicated with the liquid inlet 6 on the pressure transmission cylinder 300, and is further communicated with the high-pressure water cavity 3 of the pressure transmission cylinder 300 through the liquid inlet 6; the pump port 21 of the feed pump 200 is communicated with the feed port 4 of the pressure transmission cylinder 300, and is further communicated with the slurry cavity 2 of the pressure transmission cylinder 300 through the feed port 4; the pressure transfer cylinder 300 is provided with four electric control valves, the four electric control valves comprise a first electric control valve 8.1 corresponding to the feed inlet 4, a second electric control valve 8.2 corresponding to the discharge outlet 5, a third electric control valve 8.3 corresponding to the liquid inlet 6 and a fourth electric control valve 8.4 corresponding to the liquid outlet 7, and the opening and closing states of the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7 are associated with the opening and closing states of the electric control valves corresponding to the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7.

The controller 400 is respectively connected with the high-pressure pump 100, the feed pump 200 and the four electric control valves in a signal manner, and is used for controlling the start and stop of the high-pressure pump 100 and the feed pump 200 and the opening and closing of each electric control valve. The signal connection in this embodiment includes a wired connection or a wireless connection.

In this embodiment, the pressure transfer cylinder 300 has a feed state in which the slurry is pumped into the slurry chamber 2 and a discharge state in which the slurry in the slurry chamber 2 is driven to be pumped out from the discharge port 5.

When the pressure transmission cylinder 300 is in a feeding state, the controller 400 controls the second electric control valve 8.2 and the third electric control valve 8.3 to be closed, and the first electric control valve 8.1 and the fourth electric control valve 8.4 are opened, so that the discharge port 5 and the liquid inlet 6 on the pressure transmission cylinder 300 are in a closed state, the liquid inlet 4 and the liquid outlet 7 are in an open state, the feeding pump 200 continuously pumps the slurry in the charging bucket 16 into the slurry cavity 2, the pressure in the slurry cavity 2 is higher than the pressure in the high-pressure water cavity 3, and the rodless piston 1 is pushed to move to the right under the action of the pressure difference between the slurry cavity 2 and the high-pressure water cavity 3, namely the volume of the slurry cavity 2 is continuously increased until a sufficient amount of slurry is filled.

When the pressure transmission cylinder 300 is in a discharging state, the controller 400 controls the first electric control valve 8.1 and the fourth electric control valve 8.4 to be closed, and the second electric control valve 8.2 and the third electric control valve 8.3 to be opened, so that the feed inlet 4 and the liquid outlet 7 on the pressure transmission cylinder 300 are in a closed state, the discharge outlet 5 and the liquid inlet 6 are in an open state, the high-pressure pump 100 continuously pumps liquid medium in the charging bucket 16 into the high-pressure water cavity 3, so that the pressure in the high-pressure water cavity 3 is higher than the pressure in the slurry cavity 2, and the rodless piston 1 is pushed to move leftwards under the action of the pressure difference between the slurry cavity 2 and the high-pressure water cavity 3, and the slurry in the slurry cavity 2 is pressurized and then is extruded from the discharge outlet 5, so that the ultrahigh-pressure slurry is formed. Since the high pressure pump 100 is a direct pumping liquid medium, the high pressure pump 100 can achieve a pressure of 400MPA or even more than 400MPA by using the conventional high pressure pump for a water jet, and the pressure of the slurry pressed out of the discharge port 5 can achieve an ultra-high pressure of more than 250MPA by the primary pressurization of the feed pump 200 and the secondary pressurization of the pressure transmission cylinder 300.

Based on the embodiment, preferably, the feed pump 200 is communicated with the feed port 4 of the pressure transmission cylinder 300 through a feed pipeline, the high-pressure pump 100 is communicated with the feed port 6 of the pressure transmission cylinder 300 through a feed pipeline, a discharge pipeline is arranged on the discharge port 5 of the pressure transmission cylinder 300, one end of the discharge pipeline is communicated with the discharge port 5, the other end of the discharge pipeline is communicated with the external slurry processing equipment 500, the feed monitoring component is a feed pressure transmitter 14, the feed pressure transmitter 14 is arranged on a feed pipeline, the discharge monitoring component is a discharge pressure transmitter 15, the discharge pressure transmitter 15 is arranged on a discharge pipeline, and the feed pressure transmitter 14 and the discharge pressure transmitter 15 are respectively connected with the controller 400 through signals. When the rodless piston 1 in the pressure transmission cylinder 300 moves leftwards until the slurry in the slurry cavity 2 of the pressure transmission cylinder 300 is completely extruded, the rodless piston 1 is positioned at the limit position of the left end of the pressure transmission cylinder 300 and is in a static state, at the moment, the pressure in the discharge pipeline is reduced, the discharge pressure transmitter 15 can send out a signal, and the controller 400 switches the pressure transmission cylinder 300 from the discharge state to the feeding state after receiving the signal sent out by the discharge pressure transmitter 15; likewise, when the rodless piston 1 in the pressure transmitting cylinder 300 moves to the right until the slurry chamber 2 of the pressure transmitting cylinder 300 is filled with slurry, the rodless piston 1 is positioned at the limit position of the right end of the pressure transmitting cylinder 300 and is in a rest state, at this time, the pressure in the feeding line is increased, the feeding pressure transmitter 14 can send out a signal, and the controller 400 switches the pressure transmitting cylinder 300 from the feeding state to the discharging state after receiving the signal of the feeding pressure transmitter 14. The signals from the feed pressure transmitter 14 and the discharge pressure transmitter 15 thus enable the controller 400 to control the pressure transfer cylinder 300 to alternately switch between the feed state and the discharge state, ultimately causing the discharge port 5 of the pressure transfer cylinder 300 to pump out ultra-high pressure slurry exceeding 250MPA at intervals.

In the above embodiment, when the feeding monitoring assembly adopts the feeding pressure transmitting transducer 14, the pressure in the feeding pipeline can be detected by the feeding pressure transmitting transducer 14, that is, the pressure in the slurry cavity 2 is reduced when the rodless piston 1 moves leftwards to touch the left end position of the inner cavity of the pressure transmitting cylinder, the feeding pressure transmitting transducer 14 detects the pressure reduction to send out a detection signal, and the controller controls the current feeding pump 200 to stop pumping slurry according to the pressure detection signal of the feeding pressure transmitting transducer 14. However, in this embodiment, there is a hard contact between the rodless piston 1 and the end of the inner chamber of the pressure transmission cylinder 300, and if the feed pump 200 is not shut down in time when the rodless piston 1 is abutted against the right end of the pressure transmission cylinder 300, there is some damage to the rodless piston 1 and the feed pump 200. The improvement of the feeding monitoring assembly in this embodiment is that: the feeding monitoring component is a flow meter 27, the flow meter 27 is positioned on a connecting pipeline between the output end of the feeding pump 200 and the tee joint 11, the discharging monitoring component is a discharging pressure transmitter 15, the discharging pressure transmitter 15 is positioned on the discharging manifold 10, and the flow meter 27 and the discharging pressure transmitter 15 are respectively connected with the controller 400 in a signal mode. When the rodless piston 1 starts to move from the left end to the right end, the axial movement stroke of the rodless piston 1 in the inner cavity of the pressure transmission cylinder 300 is calculated according to the flow detection value of the flow meter 27 and the inner diameter size of the inner cavity of the pressure transmission cylinder 300, so that the rodless piston 1 stops when approaching the right end of the inner cavity of the pressure transmission cylinder 300, and the impact between the rodless piston 1 and the right end of the inner cavity of the pressure transmission cylinder 300 is well avoided.

As shown in fig. 2, in some embodiments, the pressure transfer cylinders 300 are two, including the controller 400, the bowl 16, the water tank 17, the high pressure pump 100, the feed pump 200, and the two pressure transfer cylinders 300. The liquid inlets 6 on the two pressure transmission cylinders 300 are respectively communicated with the water pumping ports 19 of the high-pressure pump 100; the feed inlets 4 of the two pressure transmission cylinders 300 are respectively communicated with the pump feed inlets 21 of the feed pump 200; four electric control valves are arranged on each pressure transmission cylinder 300, each electric control valve comprises a first electric control valve 8.1 corresponding to the feed inlet 4, a second electric control valve 8.2 corresponding to the discharge outlet 5, a third electric control valve 8.3 corresponding to the liquid inlet 6 and a fourth electric control valve 8.4 corresponding to the liquid outlet 7, and the opening and closing states of the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7 are related to the opening and closing states of the corresponding electric control valves.

The discharge ports 5 of the two pressure transfer cylinders 300 are provided with discharge pipelines, each discharge pipeline comprises two discharge branch pipes 9 and a discharge main pipe 10, the discharge ports 5 of the two pressure transfer cylinders 300 are communicated with one end of the discharge main pipe 10 through the corresponding discharge branch pipe 9, and the other end of the discharge main pipe 10 is communicated with the slurry processing equipment 500. The slurry processing apparatus 500 refers to an apparatus or device for a process into which pressurized slurry is to be introduced, including but not limited to a homogenizing valve in a homogenizer.

The controller 400 is respectively connected with the high-pressure pump 100, the feed pump 200 and each electric control valve in a signal manner, and is used for controlling the start and stop of the high-pressure pump 100 and the feed pump 200 and the opening and closing of each electric control valve. The signal connection in this embodiment includes a wired connection or a wireless connection.

In the present embodiment, the pressure transfer cylinders 300 have a feed state in which the slurry is pumped into the slurry chamber 2 and a discharge state in which the slurry in the slurry chamber 2 is driven to be pumped out from the discharge port 5, and in the present embodiment, two pressure transfer cylinders 300 are provided such that at least one pressure transfer cylinder 300 is in the discharge state during operation of the pumping system.

As one of the preferred examples of the present embodiment, the two pressure transmitting cylinders 300 are arranged to be alternately in the discharge state during the operation of the pumping system. Specifically:

wherein, the feeding state of the pressure transmitting cylinder 300: the controller 400 controls the corresponding second electric control valve 8.2 and third electric control valve 8.3 on the pressure transmission cylinder 300 to be closed, and the first electric control valve 8.1 and fourth electric control valve 8.4 are opened, so that the discharge port 5 and the liquid inlet 6 on the pressure transmission cylinder 300 are in a closed state, the liquid inlet 4 and the liquid outlet 7 are in an open state, the feeding pump 200 continuously pumps the slurry in the charging bucket 16 into the slurry cavity 2 of the pressure transmission cylinder 300, the pressure in the slurry cavity 2 is higher than the pressure in the high-pressure water cavity 3, and the rodless piston 1 is pushed to move to the right under the pressure difference between the slurry cavity 2 and the high-pressure water cavity 3, namely the volume of the slurry cavity 2 is continuously increased until the slurry is filled with the slurry.

Wherein, the discharging state of the pressure transfer cylinder 300: the controller 400 controls the corresponding first electric control valve 8.1 and fourth electric control valve 8.4 on the pressure transmission cylinder 300 to be closed, and the second electric control valve 8.2 and third electric control valve 8.3 are opened, so that the feed inlet 4 and the liquid outlet 7 on the pressure transmission cylinder 300 are in a closed state, the discharge outlet 5 and the liquid inlet 6 are in an open state, the high-pressure pump 100 continuously pumps the liquid medium in the charging bucket 16 into the high-pressure water cavity 3 of the pressure transmission cylinder 300, the pressure in the high-pressure water cavity 3 is higher than the pressure in the slurry cavity 2, and the rodless piston 1 is pushed to move leftwards under the pressure difference effect of the slurry cavity 2 and the high-pressure water cavity 3, so that the slurry in the slurry cavity 2 is pressurized and then is extruded from the discharge outlet 5, and the ultrahigh-pressure slurry is formed. Since the high pressure pump 100 is a direct pumping liquid medium, the high pressure pump 100 can achieve a pressure of 400MPA or even more than 400MPA by using the conventional high pressure pump for a water jet, and the pressure of the slurry pressed out of the discharge port 5 can achieve an ultra-high pressure of more than 250MPA by the primary pressurization of the feed pump 200 and the secondary pressurization of the pressure transmission cylinder 300.

The controller 400 enables the first pressure transfer cylinder 300 to be in a discharging state and enables the second pressure transfer cylinder 300 to be in a feeding state, and enables the second pressure transfer cylinder 300 to be synchronously switched to the discharging state when the first pressure transfer cylinder 300 is switched to the feeding state, thereby enabling the two pressure transfer cylinders 300 to be alternately in the discharging state, enabling the two pressure transfer cylinders 300 to alternately supply the ultra-high pressure slurry to the slurry processing apparatus 500, and finally enabling the whole pumping system to continuously convey the continuous ultra-high pressure slurry to the slurry processing apparatus 500 of the next process.

Further improvement as one of preferred examples of the present embodiment: the feed port 4 of the two pressure transfer cylinders 300 is communicated with the pump port 21 of the feed pump 200 through a tee joint 11, the feed port 6 of the two pressure transfer cylinders 300 is communicated with the pump port 19 of the high-pressure pump 100 through a tee joint 12, and the two discharge branch pipes 9 are communicated with the discharge main pipe 10 through a tee joint 13.

Preferably, the feed pump 200 is communicated with the feed inlets 4 of the two pressure transmission cylinders 300 through a feed pipeline, a feed pressure transmitter 14 is arranged on the feed pipeline, a discharge pressure transmitter 15 is arranged on the discharge manifold 10, and the feed pressure transmitter 14 and the discharge pressure transmitter 15 are respectively in signal connection with the controller 400. When the rodless piston 1 in the pressure transmission cylinder 300 moves leftwards until the slurry in the slurry cavity 2 of the pressure transmission cylinder 300 is completely extruded, the rodless piston 1 is positioned at the limit position of the left end of the pressure transmission cylinder 300 and is in a static state, at the moment, the pressure in the discharge pipeline is reduced, the discharge pressure transmitter 15 can send out a signal, and the controller 400 switches the pressure transmission cylinder 300 from the discharge state to the feeding state after receiving the signal sent out by the discharge pressure transmitter 15; likewise, when the rodless piston 1 in the pressure transmitting cylinder 300 moves to the right until the slurry chamber 2 of the pressure transmitting cylinder 300 is filled with slurry, the rodless piston 1 is positioned at the limit position of the right end of the pressure transmitting cylinder 300 and is in a rest state, at this time, the pressure in the feeding line is increased, the feeding pressure transmitter 14 can send out a signal, and the controller 400 switches the pressure transmitting cylinder 300 from the feeding state to the discharging state after receiving the signal of the feeding pressure transmitter 14. The signals from the feed pressure transmitter 14 and the discharge pressure transmitter 15 thus enable the controller 400 to control the pressure transfer cylinders 300 to alternately switch between the feed state and the discharge state, ultimately enabling the discharge ports 5 of the individual pressure transfer cylinders 300 to periodically pump out ultra-high pressure slurry in excess of 250 MPA.

Specifically, the feeding pipeline comprises two feeding branch pipes 24 and a feeding main pipe 25, the feeding inlets 4 of the two pressure transmission cylinders 300 are respectively communicated with one ends of the respective corresponding feeding branch pipes 24, the other ends of the feeding branch pipes 24 are communicated with one end of the feeding main pipe 25 through a tee joint 11, the other ends of the feeding main pipe 25 are communicated with the feeding pump 200, and the ground feeding pressure transmitter 14 is positioned on the feeding main pipe 25.

Preferably, the flow rate Q1 of the slurry pumped from the feed pump 200 into the slurry chamber 2 when the pressure transfer cylinder 300 is in the feed state is greater than or equal to the flow rate Q2 of the slurry pumped from the discharge port 5 when the pressure transfer cylinder 300 is in the discharge state. The flow rate refers to the volume of fluid flowing in a unit cross section per unit time, so that the flow rate can be changed by changing the cross sectional area of the outlet 5 and/or the inlet 4.

As a second preferred example of the present embodiment, the two pressure transmitting cylinders 300 are arranged such that at least one pressure transmitting cylinder 300 is in the discharge state during operation of the pumping system, and such that the time for switching one pressure transmitting cylinder 300 from the feed state to the discharge state is earlier than the time for switching the other pressure transmitting cylinder 300 from the discharge state to the feed state. Specifically:

When the first pressure transmitting cylinder 300 is in the discharging state, the second pressure transmitting cylinder 300 is in the feeding state by the controller 400, when the first pressure transmitting cylinder 300 is about to end the discharging state and is switched to the feeding state, the second pressure transmitting cylinder 300 is controlled to be switched from the feeding state to the discharging state, then the first pressure transmitting cylinder 300 is switched to the feeding state, when the second pressure transmitting cylinder 300 is about to end the discharging state and is switched to the feeding state, the first pressure transmitting cylinder 300 is controlled to be switched from the feeding state to the discharging state, thereby not only enabling at least one pressure transmitting cylinder 300 to be in the discharging state at any time during the operation of the pumping system, but also enabling the other pressure transmitting cylinder to be in the discharging state before one pressure transmitting cylinder 300 is switched to the feeding state, thereby reducing slurry pressure fluctuation at the moment of switching states of the two pressure transmitting cylinders and enabling the pressure of ultrahigh pressure slurry to be smoothly supplied to the slurry processing equipment 500.

Further improvement as a second preferred example of the present embodiment: the feed port 4 of the two pressure transfer cylinders 300 is communicated with the pump port 21 of the feed pump 200 through a tee joint 11, the feed port 6 of the two pressure transfer cylinders 300 is communicated with the pump port 19 of the high-pressure pump 100 through a tee joint 12, and the two discharge branch pipes 9 are communicated with the discharge main pipe 10 through a tee joint 13.

Preferably, the flow Q1 of the slurry pumped from the feed pump 200 into the slurry chamber 2 when the pressure transfer cylinder 300 is in the feed state is greater than the flow Q2 of the slurry pumped from the discharge port 5 when the pressure transfer cylinder 300 is in the discharge state. The flow rate refers to the volume of fluid flowing in a unit cross section per unit time, so that the flow rate can be changed by changing the cross sectional area of the outlet 5 and/or the inlet 4.

As the above embodiments, it is preferable that the high-pressure pump 100 is communicated with the liquid inlets 6 of the two pressure transmission cylinders 300 through liquid inlet pipelines, the liquid inlet pipelines comprise two liquid inlet branch pipes 22 and one liquid inlet main pipe 23, the liquid inlets 6 of the two pressure transmission cylinders 300 are communicated with one ends of the liquid inlet main pipes 23 through the respective corresponding liquid inlet branch pipes 22, and the other ends of the discharging main pipes 10 are communicated with the high-pressure pump 100.

In some embodiments, the number of the pressure transfer cylinders 300 is three, as shown in fig. 3, and the number of the pressure transfer cylinders 300 is three, and the present embodiment includes a controller 400, a material bucket 16, a water tank 17, a high pressure pump 100, a feed pump 200, and three pressure transfer cylinders 300. The liquid inlets 6 on the three pressure transmission cylinders 300 are respectively communicated with the water pumping ports 19 of the high-pressure pump 100; the feed inlets 4 of the three pressure transmission cylinders 300 are respectively communicated with the pump feed inlets 21 of the feed pump 200; four electric control valves are arranged on each pressure transmission cylinder 300, each electric control valve comprises a first electric control valve 8.1 corresponding to the feed inlet 4, a second electric control valve 8.2 corresponding to the discharge outlet 5, a third electric control valve 8.3 corresponding to the liquid inlet 6 and a fourth electric control valve 8.4 corresponding to the liquid outlet 7, and the opening and closing states of the feed inlet 4, the discharge outlet 5, the liquid inlet 6 and the liquid outlet 7 are related to the opening and closing states of the corresponding electric control valves.

The discharge ports 5 of the three pressure transfer cylinders 300 are respectively provided with a discharge pipeline, each discharge pipeline comprises three discharge branch pipes 9 and a discharge main pipe 10, the discharge ports 5 of the three pressure transfer cylinders 300 are communicated with one end of the discharge main pipe 10 through the corresponding discharge branch pipes 9, and the other end of the discharge main pipe 10 is communicated with the slurry processing equipment 500. The slurry processing apparatus 500 refers to an apparatus or device for a process into which pressurized slurry is to be introduced, including but not limited to a homogenizing valve in a homogenizer.

In the present embodiment, three pressure transmission cylinders 300 are provided, two pressure transmission cylinders 300 are common pressure transmission cylinders 300, and the remaining one pressure transmission cylinder 300 is a standby pressure transmission cylinder 300, and each of the electric control valves at both ends of the standby pressure transmission cylinder 300 is in a normally closed state. In this embodiment, only two conventional pressure transfer cylinders 300 are involved in the pumping operation of the daily slurry, and the two pressure transfer cylinders 300 are referred to above. When one of the two common pressure transfer cylinders 300 fails or needs to be subjected to daily maintenance or the like, the controller 400 can replace the pressure transfer cylinder to be maintained with the remaining pressure transfer cylinder 300 as a standby pressure transfer cylinder 300, so that the operation of the whole slurry pumping system is not affected in the maintenance process of the single pressure transfer cylinder 300.

As shown in fig. 5, in some embodiments, the rodless piston 1 includes a piston base block 1.1, a left sealing pressing plate 1.2, a right sealing pressing plate 1.3, a left sealing ring 1.4 and a right sealing ring 1.5, the piston base block 1.1 is slidably matched with an inner side wall of an inner cavity of the pressure transmission cylinder 300, the left sealing pressing plate 1.2 and the right sealing pressing plate 1.3 are respectively fixed with two ends of the piston base block 1.1 and form annular grooves around the piston base block 1.1, and the right sealing ring 1.5 and the left sealing ring 1.4 are limited in the corresponding annular grooves along the axial direction.

The invention provides a control method of a graphene pumping system, which comprises the steps of preparing and controlling in the working process, wherein each embodiment of the graphene pumping system comprises at least two pressure transfer cylinders 300:

wherein, the preparation step:

s1, the controller 400 controls each electric control valve to enable the liquid inlet 6 and the liquid outlet 5 on each pressure transmission cylinder 300 to be closed, and simultaneously the liquid inlet 4 and the liquid outlet 7 on each pressure transmission cylinder 300 to be opened;

s2, the controller 400 controls the feeding pump 200 to start, so that the slurry fills the slurry cavities 2 of the pressure transmission cylinders 300 from the feeding holes 4;

s3, the controller 400 closes the feed inlet 4 and the liquid outlet 7 through corresponding electric control valves on the feed inlet 4 and the liquid outlet 7 of each pressure transmission cylinder 300;

S4, the controller 400 controls the high-pressure pump 100 to start; at this point, the preparation for pumping the ultra-high pressure slurry is completed.

Wherein, the control step in the working process:

s5, selecting one of the plurality of pressure transfer cylinders 300 as a first pressure transfer cylinder 300, arranging the rest pressure transfer cylinders in sequence according to the number, and controlling the liquid inlet 6 and the liquid outlet 5 of the first pressure transfer cylinder 300 to be opened by the controller 400 through corresponding electric control valves, and simultaneously keeping the liquid inlet 4 and the liquid outlet 7 of the first pressure transfer cylinder closed, so that the slurry in the slurry cavity 2 of the first pressure transfer cylinder 300 is pumped out from the liquid outlet 5 at the left side of the cylinder body under the pushing of the rodless piston 1; the first pressure transfer cylinder 300 is in a discharge state at this time;

s6, when the rodless piston 1 in the first pressure transmission cylinder 300 moves leftwards until the rodless piston is propped against the left end of the inner cavity of the pressure transmission cylinder 300, the pressure in the slurry cavity 2 is reduced, the discharge pressure transmitter 15 detects the pressure in the slurry cavity 2 in real time, when the pressure value is reduced to a set lower limit value, the discharge pressure transmitter 15 gives out a first detection signal, the controller 400 receives the first detection signal and controls the first pressure transmission cylinder 300 to switch from a discharge state to a feed state according to the first detection signal, and the controller controls the opening and closing of each electric control valve on the first pressure transmission cylinder 300 to open the feed port 4 and the liquid outlet 7 of the first pressure transmission cylinder 300, and simultaneously the liquid inlet 6 and the liquid outlet 5 are closed, so that the feed pump 200 pumps slurry into the slurry cavity 2 of the first pressure transmission cylinder 300;

S7, in the step S6, the controller 400 receives a first detection signal and controls the first pressure transmission cylinder 300 to switch to a feeding state according to the first detection signal, and simultaneously the controller 400 synchronously controls the next pressure transmission cylinder 300 to switch to a discharging state, so that a liquid inlet 6 and a liquid outlet 5 of the next pressure transmission cylinder 300 are opened, and a liquid inlet 4 and a liquid outlet 7 of the next pressure transmission cylinder are kept closed;

s8, switching the first pressure transmission cylinder 300 to a feeding state, wherein the feeding pump 200 pumps slurry into the slurry cavity 2 of the first pressure transmission cylinder 300 so that the rodless piston 1 in the first pressure transmission cylinder 300 moves rightwards, when the rodless piston 1 moves rightwards until the pressure in the slurry cavity 2 is raised when the rodless piston abuts against the right end of the inner cavity of the pressure transmission cylinder 300, the feeding pressure transmitter 14 gives a second detection signal according to the pressure detection value in the slurry cavity 2 of the first pressure transmission cylinder 300, and the controller 400 receives the second detection signal and controls the feeding port 4 and the liquid outlet 7 of the first pressure transmission cylinder 300 to be closed according to the second detection signal;

s9, if the controller 400 does not receive the stop instruction, the two pressure transmission cylinders 300 sequentially circulate the steps S6-S8; if the controller 400 receives a stop command, the feed pump 200 and the discharge ports 5 of the two pressure transmission cylinders 300 are closed.

Preferably, in the step S8, the time for the next pressure transfer cylinder 300 to open the liquid inlet 6 and the liquid outlet 5 is later than the time for the previous pressure transfer cylinder 300 to close the liquid inlet 6 and the liquid outlet 5 and open the liquid inlet 4 and the liquid outlet 7, so that at least one pressure transfer cylinder 300 is in a discharging state at any time during the operation of the graphene pumping system.

Improvement of control steps in the control method for ultra-high pressure slurry pumping based on the above embodiment: the feed pressure transmitter 14 between the feed pump 100 and the feed port 4 of the pressure transfer cylinder 300 is replaced with a flow meter 27, as shown in fig. 7, the flow meter 27 being arranged on the connection line between the feed pump 100 and the feed port 4; step S8 in the above control method is replaced with:

s8, the first pressure transmission cylinder 300 is switched to a feeding state, at this time, the feeding pump 200 pumps slurry into the slurry cavity 2 of the first pressure transmission cylinder 300 so that the rodless piston 1 in the first pressure transmission cylinder 300 moves to the right, the flow meter 27 records the flow rate of the slurry pumped into the slurry cavity 2 from the liquid inlet 4 in real time, when the detection amount of the flow meter 27 reaches a set value, the flow meter gives a second detection signal, and the controller 400 receives the second detection signal and controls the feed inlet 4 and the liquid outlet 7 of the first pressure transmission cylinder 300 to be closed according to the second detection signal.

In some embodiments, the pump port of the feed pump 200 is communicated with the feed port of the pressure transmission cylinder 300 through a feed pipeline, further, the feed pipeline comprises feed branch pipes 24 and one feed main pipe 25, the number of the feed branch pipes is the same as that of the pressure transmission cylinder 300, each feed branch pipe 24 is communicated with the feed main pipe 25, a pressure relief valve 26 is arranged on the feed main pipe, and the pressure relief valve 26 can also be an overflow valve.

An improvement of the control method for pumping ultra-high pressure slurry according to the above embodiment, wherein the control method includes a preparation step and a control step in the working process, and is characterized in that: the pump port of the feed pump 200 is communicated with the feed port of the pressure transmission cylinder 300 through a feed pipeline, the feed pipeline comprises feed branch pipes 24 and a feed main pipe 25, the number of the feed branch pipes 24 is the same as that of the pressure transmission cylinder 300, each feed branch pipe 24 is communicated with the feed main pipe 25, a pressure release valve 26 is arranged on the feed main pipe, and the control method further comprises a pressure release step after a control step in the working process:

s10, closing the liquid outlet 7 of each pressure transmission cylinder 300, and opening the liquid inlet of each pressure transmission cylinder 300 and the pressure relief valve 26;

s11, the high-pressure pump 100 is kept in an open state, so that residual slurry in each pressure transmission cylinder 300 is emptied from the pressure relief valve 26 through a feed pipeline from the respective feed port 4;

S12, the high-pressure pump 100 is turned off, the liquid inlet 6 and the liquid inlet 4 of each pressure transmission cylinder 300 are turned off, and the pressure release valve 26 is turned off. In this embodiment, the pressure relief step is used to drain the residual slurry in each pressure transfer cylinder 300, so as to avoid the slurry from forming deposition after long-time retention in the pressure transfer cylinder, thereby causing damage to the pressure transfer cylinder 300.

It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalents and alternatives falling within the scope of the claims are intended to be embraced therein.

Claims

1. A graphene pumping system and a control method are characterized by comprising the following steps:

a high pressure pump (100) for pumping a liquid medium;

a feed pump (200) for pumping the slurry;

the pressure transmission cylinder (300), there is no rod piston (1) in the pressure transmission cylinder (300), there is no rod piston (1) that cooperates with the pressure transmission cylinder (300) slidably and separates the inner chamber of the pressure transmission cylinder (300) into slurry cavity (2) and high-pressure water cavity (3), there are feed inlet (4) and discharge outlet (5) communicated with slurry cavity (2) separately at both ends of the said pressure transmission cylinder (300), and feed inlet (6) and drain outlet (7) communicated with high-pressure water cavity (3), the output end of the said high-pressure pump (100) is communicated with feed inlet (6), the output end of the said feed pump (200) is communicated with feed inlet (4), the said pressure transmission cylinder (300) has feed state of pumping slurry towards slurry cavity (2) and discharge state of driving slurry in slurry cavity (2) to pump from drain outlet (5), there are electric control valves on the said feed inlet (4), drain outlet (5), feed inlet (6) and drain outlet (7) separately;

the feeding monitoring assembly is arranged on a connecting pipeline between the feeding pump (100) and the feeding port (4) and used for monitoring the position of the rodless piston (1) when the pressure transmission cylinder (300) is in a feeding state, and the discharging monitoring assembly is arranged on a connecting pipeline communicated with the discharging port (5) and used for monitoring the position of the rodless piston (1) when the pressure transmission cylinder (300) is in a discharging state;

And the controller (400) is used for controlling the start and stop of the high-pressure pump (100) and the feed pump (200) and the opening and closing of each electric control valve, and the feed monitoring component and the discharge monitoring component are respectively connected with the controller through signals.

2. The graphene pumping system of claim 1, wherein:

the pressure transfer cylinders (300) are multiple, the discharge ports (5) of the pressure transfer cylinders (300) are communicated with the discharge main pipe (10) through the corresponding discharge branch pipes (9), and each pressure transfer cylinder (300) is arranged in a discharge state when at least one pressure transfer cylinder (300) is in a working process.

3. The graphene pumping system of claim 2, wherein: the number of the pressure transmission cylinders (300) is two.

4. A graphene pumping system according to claim 3, wherein: the feed inlet (4) of the two pressure transfer cylinders (300) are communicated with the output end of the feed pump (200) through a tee joint (11), the liquid inlet (6) of the two pressure transfer cylinders (300) are communicated with the output end of the high-pressure pump (100) through a tee joint (12), the two discharging branch pipes (9) are communicated with the discharging main pipe (10) through a tee joint (13), and the two pressure transfer cylinders (300) are alternately in a discharging state in the working process.

5. The graphene pumping system of claim 4, wherein: the feeding monitoring assembly is a feeding pressure transmitter (14), the feeding pressure transmitter (14) is located on a connecting pipeline between the output end of the feeding pump (200) and the tee joint (11), the discharging monitoring assembly is a discharging pressure transmitter (15), the discharging pressure transmitter (15) is located on the discharging main pipe (10), and the feeding pressure transmitter (14) and the discharging pressure transmitter (15) are respectively connected with the controller (400) in a signal mode.

6. The graphene pumping system of claim 4, wherein: the feeding monitoring assembly is a flowmeter (27), the flowmeter (27) is located on a connecting pipeline between the output end of the feeding pump (200) and the tee joint (11), the discharging monitoring assembly is a discharging pressure transmitter (15), the discharging pressure transmitter (15) is located on the discharging main pipe (10), and the flowmeter (27) and the discharging pressure transmitter (15) are respectively connected with a controller (400) in a signal mode.

7. The graphene pumping system of claim 2, wherein: the pressure transmission cylinders (300) are three, two of the pressure transmission cylinders (300) are common pressure transmission cylinders (300), the rest of the pressure transmission cylinders (300) are standby pressure transmission cylinders (300), and each electric control valve at two ends of each standby pressure transmission cylinder (300) is in a normally closed state.

8. The graphene pumping system according to any one of claims 3-7, wherein: the flow Q1 of the slurry pumped from the feed pump (200) into the slurry cavity (2) when the pressure transfer cylinder (300) is in a feeding state is greater than or equal to the flow Q2 of the slurry pumped from the discharge port (5) when the pressure transfer cylinder (300) is in a discharging state.

9. The graphene pumping system of claim 1, wherein: the rodless piston (1) comprises a piston base block (1.1), a left sealing pressing plate (1.2), a right sealing pressing plate (1.3), a left sealing ring (1.4) and a right sealing ring (1.5), wherein the piston base block (1.1) is in sliding fit with the inner side wall of an inner cavity of a pressure transmission cylinder (300), the left sealing pressing plate (1.2) and the right sealing pressing plate (1.3) are respectively fixed with two ends of the piston base block (1.1) and form annular grooves by surrounding the piston base block (1.1), and the right sealing ring (1.5) and the left sealing ring (1.4) are located in the corresponding annular grooves along the axial limit.

10. A control method of a graphene pumping system is characterized by comprising the following steps: an ultra high pressure slurry pumping system comprising the above claim 5, said control method comprising the steps of:

S1, closing a liquid inlet (6) and a liquid outlet (5) on each pressure transmission cylinder (300), and opening each feed inlet (4) and each liquid outlet (7);

s2, starting a feed pump (200) to enable slurry to fill the slurry cavity (2) of each pressure transmission cylinder (300) from a feed inlet (4);

s3, closing a feed port (4) and a liquid discharge port (7) on each pressure transmission cylinder (300);

s4, starting the high-pressure pump (100);

s5, the controller (400) controls the first pressure transmission cylinder (300) to be switched to a discharging state, so that a liquid inlet (6) and a liquid outlet (5) of the first pressure transmission cylinder (300) are opened, a liquid inlet (4) and a liquid outlet (7) are kept closed, and the slurry in the slurry cavity (2) of the first pressure transmission cylinder (300) is pumped out from the liquid outlet (5);

s6, when the rodless piston (1) in the first pressure transmission cylinder (300) moves leftwards until the pressure in the slurry cavity (2) is reduced when the rodless piston is propped against the left end of the inner cavity of the pressure transmission cylinder (300), the discharging pressure transmitter (15) sends out a first detection signal, the controller (400) receives the first detection signal and controls the first pressure transmission cylinder (300) to be switched to a feeding state according to the first detection signal, so that a feeding port (4) and a liquid outlet (7) of the first pressure transmission cylinder (300) are opened, and meanwhile, a liquid inlet (6) and a liquid outlet (5) are closed, and the feeding pump (200) pumps slurry into the slurry cavity (2);

S7, a controller (400) receives a first detection signal and controls a first pressure transmission cylinder (300) to be switched to a feeding state according to the first detection signal, and simultaneously the controller (400) synchronously controls a next pressure transmission cylinder (300) to be switched to a discharging state, so that a liquid inlet (6) and a liquid outlet (5) of the next pressure transmission cylinder (300) are opened, and a liquid inlet (4) and a liquid outlet (7) of the next pressure transmission cylinder are kept closed;

s8, when the rodless piston (1) in the first pressure transmission cylinder (300) moves to the right until the rodless piston is propped against the right end of the inner cavity of the pressure transmission cylinder (300), the pressure in the slurry cavity (2) rises, so that the feeding pressure transmitter (14) sends out a second detection signal, and the controller (400) receives the second detection signal and controls the feeding port (4) and the liquid discharge port (7) of the first pressure transmission cylinder (300) to be closed according to the second detection signal;

s9, if the controller (400) does not receive the stop instruction, the two pressure transmission cylinders (300) sequentially circulate the steps S6-S8; and if the controller (400) receives the stop instruction, closing the feed pump (200) and the discharge ports (5) of the two pressure transmission cylinders (300).