CN117212090A

CN117212090A - Graphene pumping system with buffer function and control method

Info

Publication number: CN117212090A
Application number: CN202310975528.XA
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 with a buffering function and a control method thereof, wherein a feeding system comprises a high-pressure pump, a feeding 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 feeding port and a discharging port 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 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, electric control valves are respectively arranged on the feed inlet, the discharge outlet, the liquid inlet and the liquid outlet, and a non-contact detection mechanism for detecting the position of the rodless piston is arranged on the pressure transmission cylinder. The invention provides a graphene pumping system with a buffer function and a control method, which can pressurize fluid containing solid particles to ultra-high pressure exceeding 250 MPA.

Description

Graphene pumping system with buffer function and control method

Technical Field

The invention relates to the technical field of slurry pumping systems, in particular to a graphene pumping system with a buffer function 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 containing a buffer function 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 with a buffer function, 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 which 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, 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 non-contact detection mechanism comprises an induction magnetic block, a first Hall element and a second Hall element, wherein the induction magnetic block is positioned in the pressure transmission cylinder and is embedded on the rodless piston, the first Hall element and the second Hall element are both arranged outside an inner cavity of the pressure transmission cylinder, and the first Hall element and the second Hall element respectively correspond to two ends of the inner cavity of the pressure transmission cylinder;

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 the feed inlet, the discharge outlet, the liquid inlet and the liquid outlet are respectively provided with an electric control valve;

the controller is used for controlling the start and stop of the high-pressure pump and the feed pump and the opening and closing of each electric control valve;

and each Hall element in the non-contact detection mechanism is respectively connected with the controller through 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 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, finally, the ultrahigh-pressure slurry exceeding 250MPA is obtained, secondly, the high-pressure pump and the feed pump used in the pumping system are all existing commercial products, the structure of the pressure transmission cylinder is simple, the whole manufacturing cost is low, and secondly, the high-pressure pump is not contacted with the slurry, the influence of solid particles contained in the slurry on the service life of the high-pressure pump is avoided, and finally, the position of the rodless piston in the pressure transmission cylinder can be detected outside the pressure transmission cylinder through a non-contact detection mechanism, so that the rodless piston is prevented from being in hard contact with two ends of the inner cavity of the pressure transmission cylinder in the process of reciprocating piston movement, and the buffering function between the rodless piston and the pressure transmission cylinder is realized.

According to one example of the invention, the sensing magnetic blocks are multiple, and each sensing magnetic block is uniformly arranged along the circumferential direction of the rodless piston. The rodless piston timely rotates circumferentially in the reciprocating axial movement process, at least one induction magnetic block can be ensured to be in the effective induction range of the Hall element, and the detection reliability of the Hall element is improved.

According to one example of the invention, the pressure transfer cylinder has a feed state for pumping slurry into the slurry chamber and a discharge state for driving the slurry in the slurry chamber out of the discharge port;

the pressure transfer cylinders are multiple, the discharge ports of the pressure transfer cylinders are communicated with the discharge header pipe through the corresponding discharge branch pipes, and at least one pressure transfer cylinder is arranged in a discharge state in the working process. 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 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, the right sealing ring and the left sealing ring are axially limited in the corresponding annular grooves, and the induction magnetic block is embedded on the outer side wall of the piston base block.

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:

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, when a rodless piston in a first pressure transmission cylinder moves to be close to a discharge hole, a first Hall element on the first pressure transmission cylinder detects an induction magnetic block moving along with the rodless piston and gives a first detection signal, 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 port and a liquid discharge port of the first pressure transmission cylinder are opened, a liquid inlet and the discharge hole are closed at the same time, and a feed pump pumps slurry into a slurry cavity;

S7, when the controller receives a first detection signal sent by a first Hall element on a first pressure transfer cylinder and controls the first pressure transfer cylinder to be switched to a feeding state according to the first detection signal, the controller synchronously controls the 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 meanwhile, the liquid inlet and the liquid outlet are kept closed;

s8, when the rodless piston in the first pressure transmission cylinder moves to be close to the liquid outlet, the second Hall element on the first pressure transmission cylinder detects the induction magnetic block moving along with the rodless piston and gives out a second detection signal, and the controller receives the second detection signal and controls the feed inlet and the liquid outlet of the first pressure transmission cylinder to be closed according to the second detection signal;

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 cross-sectional view in the direction "C-C" in FIG. 5.

100 parts of a high-pressure pump; 200. a feed pump; 300. a pressure transmitting cylinder; 400. a controller; 500. slurry processing equipment; 600. a detection mechanism;

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. sensing magnetic blocks; 15.1, a first hall element; 15.2, a second hall element; 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. and (5) mounting holes.

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 including a buffer function 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 with a buffer function, which is shown in fig. 1-3 and comprises a controller 400, a charging basket 16, a water tank 17, a high-pressure pump 100, a feed pump 200 and at least one pressure transmission cylinder 300.

The bowl 16 is configured to hold a slurry, preferably a graphene slurry.

The water tank 17 is arranged for containing a liquid medium, preferably pure water or hydraulic oil.

The high-pressure pump 100 has a water suction port 18 and a water suction port 19, and the high-pressure pump 100 is configured to pump out the liquid medium from the water suction port 19 after being pumped and pressurized by 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 commercially available high-pressure pump for 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 the slurry from the bucket 16 through the suction port 20 and pump the slurry out of the pump port 21 after pressurizing the slurry, where the pressure of the slurry pumped out of the feed pump 200 is lower than the final required working pressure of the slurry. The feed pump 200 is preferably an existing plunger pump.

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 non-contact detection mechanism 600 is a hall sensor, the non-contact detection mechanism 600 comprises an induction magnetic block 14, a first hall element 15.1 and a second hall element 15.2, the induction magnetic block 14 is matched with each hall element, so that each hall element can give out a detection signal of the induction magnetic block 14 when the induction magnetic block 14 enters an induction area of the hall element, the induction magnetic block 14 is positioned in an inner cavity of the pressure transmission cylinder 300 and is embedded on the rodless piston 1, the first hall element 15.1 and the second hall element 15.2 are both arranged outside the inner cavity of the pressure transmission cylinder 300, and the first hall element 15.1 and the second hall element 15.2 respectively correspond to two ends of the inner cavity of the pressure transmission cylinder 300. As shown in fig. 4 and 5, the slurry chamber 2 is located at the left side of the rodless piston 1, the high-pressure water chamber 3 is located at the right side of the rodless piston 1, the first hall element 15.1 corresponds to the left end area of the slurry chamber 2 facing away from the high-pressure water chamber 3, and the second hall element 15.2 corresponds to the right end area of the high-pressure water chamber 3 facing away from the slurry chamber 2, so that the first hall element 15.1 gives a detection signal when the rodless piston 1 drives the sensing magnet 14 to move leftwards to approach the left end of the slurry chamber 2. Similarly, the second hall element 15.2 gives a detection signal when the rodless piston 1 drives the induction magnet 14 to move to the right to approach the right end of the high-pressure water chamber 3. In the present embodiment, the position of the rodless piston 1 can be detected by the hall element by the hall effect while keeping the cylinder body 1 intact, and in order to enable the hall element to better go over the side wall of the pressure transmitting cylinder 300 so as to sense the position of the sensing magnet 14, the pressure transmitting cylinder 300 is preferably made of stainless steel while ensuring the wall thickness.

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 topic name of the graphene pumping system with the buffering function in the above embodiment refers to that by adding the non-contact detection mechanism 600, the rodless piston 1 in the pressure transmission cylinder 300 in the graphene pumping system does not generate hard contact with the end of the inner cavity of the pressure transmission cylinder 300 in the process of performing reciprocating motion, that is, the rodless piston 1 has a buffering stroke in the process of switching between the feeding state and the discharging state, and finally the pressure transmission cylinder 300 in the embodiment has the buffering function on the basis of the non-contact detection mechanism 600 compared with other pumping systems without the non-contact detection mechanism 600, so the topic name of the embodiment emphasizes that the graphene pumping system with the buffering function.

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. Each hall element in the non-contact detection mechanism 600 is respectively connected with the controller 400 in a signal manner, and the controller receives the detection signals of each hall element and controls 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 according to the detection signals, so as to control the axial movement of the rodless piston 1.

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.

Preferably, according to this embodiment, 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, the discharge port 5 of the pressure transmission cylinder 300 is provided with a discharge pipeline, one end of the discharge pipeline is communicated with the discharge port 5, and the other end of the discharge pipeline is communicated with the external slurry processing equipment 500. 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 first Hall element 15.1 detects the position of the sensing magnetic block 14 on the rodless piston 1 and gives out a detection signal, the controller 400 receives the detection signal of the first Hall element 15.1 to switch the pressure transmission cylinder 300 from a discharging state to a feeding state, at the moment, the rodless piston 1 stays at a left limit position, and a space is reserved between the rodless piston 1 and the left end of the inner cavity of the pressure transmission cylinder 300; similarly, when the rodless piston 1 in the pressure transmission cylinder 300 moves to the right until the slurry cavity 2 of the pressure transmission cylinder 300 is filled with slurry, the second hall element 15.2 detects the position of the sensing magnet 14 on the rodless piston 1 and gives a detection signal, the controller 400 receives the detection signal of the second hall element 15.2 to switch the pressure transmission cylinder 300 from the feeding state to the discharging state, at this time, the rodless piston 1 stays at the right limit position, and a space is reserved between the rodless piston 1 and the right end of the inner cavity of the pressure transmission cylinder 300. The detection signals given by the first hall element 15.1 and the second hall element 15.2 in the non-contact detection mechanism 600 enable the controller 400 to control the pressure transmission cylinder 300 to alternately switch between a feeding state and a discharging state, so that the discharge port 5 of the pressure transmission cylinder 300 pumps ultrahigh-pressure slurry with a gap of more than 250MPA, and the rodless piston 1 does not make hard contact with the two end positions of the inner cavity of the pressure transmission cylinder 300 in the reciprocating piston motion process.

As shown in fig. 2, in some embodiments, the pressure transfer cylinders 300 include two pressure transfer cylinders 300, including the controller 400, the bucket 16, the water tank 17, the high pressure pump 100, the feed pump 200, and two pressure transfer cylinders 300, and each pressure transfer cylinder 300 is provided with a non-contact detection mechanism 600. 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 in communication with the feed ports 4 of the two pressure transfer cylinders 300 via feed lines. 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 first Hall element 15.1 detects the position of the sensing magnetic block 14 on the rodless piston 1 and gives out a detection signal, the controller 400 receives the detection signal of the first Hall element 15.1 to switch the pressure transmission cylinder 300 from a discharging state to a feeding state, at the moment, the rodless piston 1 stays at a left limit position, and a space is reserved between the rodless piston 1 and the left end of the inner cavity of the pressure transmission cylinder 300; similarly, when the rodless piston 1 in the pressure transmission cylinder 300 moves to the right until the slurry cavity 2 of the pressure transmission cylinder 300 is filled with slurry, the second hall element 15.2 detects the position of the sensing magnet 14 on the rodless piston 1 and gives a detection signal, the controller 400 receives the detection signal of the second hall element 15.2 to switch the pressure transmission cylinder 300 from the feeding state to the discharging state, at this time, the rodless piston 1 stays at the right limit position, and a space is reserved between the rodless piston 1 and the right end of the inner cavity of the pressure transmission cylinder 300. The detection signals given by the first hall element 15.1 and the second hall element 15.2 in the non-contact detection mechanism 600 enable the controller 400 to control the pressure transmission cylinder 300 to alternately switch between a feeding state and a discharging state, so that the discharge port 5 of the pressure transmission cylinder 300 pumps ultrahigh-pressure slurry with a gap of more than 250MPA, and the rodless piston 1 does not make hard contact with the two end positions of the inner cavity of the pressure transmission cylinder 300 in the reciprocating piston motion process.

Specifically, the feeding pipeline comprises two feeding branch pipes 24 and a feeding main pipe 25, the feeding ports 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, and the other ends of the feeding main pipe 25 are communicated with the feeding pump 200.

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 feed pump 200 is in communication with the feed ports 4 of the two pressure transfer cylinders 300 via feed lines. 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 first Hall element 15.1 detects the position of the sensing magnetic block 14 on the rodless piston 1 and gives out a detection signal, the controller 400 receives the detection signal of the first Hall element 15.1 to switch the pressure transmission cylinder 300 from a discharging state to a feeding state, at the moment, the rodless piston 1 stays at a left limit position, and a space is reserved between the rodless piston 1 and the left end of the inner cavity of the pressure transmission cylinder 300; similarly, when the rodless piston 1 in the pressure transmission cylinder 300 moves to the right until the slurry cavity 2 of the pressure transmission cylinder 300 is filled with slurry, the second hall element 15.2 detects the position of the sensing magnet 14 on the rodless piston 1 and gives a detection signal, the controller 400 receives the detection signal of the second hall element 15.2 to switch the pressure transmission cylinder 300 from the feeding state to the discharging state, at this time, the rodless piston 1 stays at the right limit position, and a space is reserved between the rodless piston 1 and the right end of the inner cavity of the pressure transmission cylinder 300. The detection signals given by the first hall element 15.1 and the second hall element 15.2 in the non-contact detection mechanism 600 enable the controller 400 to control the pressure transmission cylinder 300 to alternately switch between a feeding state and a discharging state, so that the discharge port 5 of the single pressure transmission cylinder 300 can periodically pump ultra-high pressure slurry exceeding 250MPA, and the rodless piston 1 is not in hard contact with the two end positions of the inner cavity of the pressure transmission cylinder 300 in the process of reciprocating piston movement. .

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 or more, as shown in fig. 3, and the number of the pressure transfer cylinders 300 is three, and this embodiment includes a controller 400, a charging basket 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 spare pressure transfer cylinder 300, so that the operation of the whole 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.

Based on the preferred examples of the non-contact detection mechanism 600 in the above embodiments: the outer side wall of the cylinder body of the pressure transmission cylinder 300 is provided with mounting holes 27 corresponding to the end positions of the slurry cavity 2 and the high-pressure water cavity 3, which are away from each other, and the first hall element 15.1 and the second hall element 15.2 are respectively embedded in the corresponding mounting holes 27.

As shown in fig. 7, preferably, the sensing magnetic blocks 14 are plural, and the plural sensing magnetic blocks 14 are uniformly arranged along the circumferential direction of the rodless piston 1. Specifically, each induction magnet 14 is embedded in the outer side wall of the rodless piston 1.

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 time, the preparation work of pumping the ultrahigh 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 position of the rodless piston 1 is close to the position of the discharge hole 5, the first Hall element 15.1 on the first pressure transmission cylinder 300 detects the induction magnet 14 moving along with the rodless piston 1 and gives a first detection signal, the controller 400 receives the first detection signal and controls the first pressure transmission cylinder 300 to switch from the discharge state to the 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 discharge hole 7 of the first pressure transmission cylinder 300, and simultaneously closes the liquid inlet 6 and the discharge hole 5, and at the moment, the feed pump 200 pumps slurry into the slurry cavity 2 of the first pressure transmission cylinder 300;

s7, in the step S6, when the controller 400 receives the first detection signal and controls the first pressure transmission cylinder 300 to switch to the feeding state according to the first detection signal, the controller 400 synchronously controls the next pressure transmission cylinder 300 to switch to the discharging state, so that the liquid inlet 6 and the liquid outlet 5 of the next pressure transmission cylinder 300 are opened, and the liquid inlet 4 and the liquid outlet 7 thereof are kept closed;

s8, when the rodless piston 1 in the first pressure transmission cylinder 300 moves rightwards until approaching the liquid outlet 7, the second Hall element 15.2 on the first pressure transmission cylinder 300 detects the induction magnetic block 14 moving along with the rodless piston 1 and 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;

S9, if the controller 400 does not receive the stop command, the two pressure transfer cylinders 300 sequentially circulate in the steps S6-S8, namely, the controller 400 controls the two pressure transfer cylinders 300 to alternately enter a discharging state, and sequentially controls each pressure transfer cylinder 300 to alternately circulate between a feeding state and a discharging state according to detection signals of the first Hall element 15.1 and the second Hall element 15.2 on each pressure transfer cylinder 300; 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.

The stop command may be a stop command input manually or may be a stop command input to the controller 400 in advance according to a set condition.

Preferably, in the step S6, the time for the latter pressure transfer cylinder 300 to open the liquid inlet 6 and the liquid outlet 5 is later than the time for the former 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.

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.

In some embodiments, the step S2 includes the steps of:

s2.1, starting a feed pump 200 to enable slurry to be filled into the slurry cavity 2 of each pressure transmission cylinder 300 from a feed inlet 4 at a flow rate Q1;

s2.2, a second Hall element 15.2 in the non-contact detection mechanism 600 corresponding to each pressure transmission cylinder 300 detects the induction magnet 14 on the rodless piston 1 in the corresponding pressure transmission cylinder 300 and sends out a detection signal;

s2.3, the controller 400 marks the pressure transmission cylinder 300 in a full state according to detection signals given by the second Hall element 15.2 of each non-contact detection mechanism 600;

step S3, when each pressure transmission cylinder 300 is in a full state, the controller 400 closes the feed inlet 4 and the liquid outlet 7 on each pressure transmission cylinder 300;

step S4, the controller 400 starts the high-pressure pump 100, so that the graphene pumping system enters a normal working process from a preparation process.

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 having a buffering function, comprising:

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), the no rod piston (1) cooperates with the pressure transmission cylinder (300) slidably and separates the inner cavity of the pressure transmission cylinder (300) into slurry cavity (2) and high-pressure water cavity (3), both ends of the said pressure transmission cylinder (300) have feed inlet (4) and discharge outlet (5) communicated with slurry cavity (2) separately, and feed inlet (6) and drain outlet (7) communicated with high-pressure water cavity (3);

the non-contact detection mechanism (600) comprises an induction magnetic block (14), a first Hall element (15.1) and a second Hall element (15.2), wherein the induction magnetic block (14) is positioned in the pressure transmission cylinder (300) and is embedded on the rodless piston (1), the first Hall element (15.1) and the second Hall element (15.2) are both arranged outside an inner cavity of the pressure transmission cylinder (300), and the first Hall element (15.1) and the second Hall element (15.2) respectively correspond to two ends of the inner cavity of the pressure transmission cylinder (300);

The output end of the high-pressure pump (100) is communicated with the high-pressure water cavity (3) through a liquid inlet (6), the output end of the feed pump (200) is communicated with the slurry cavity (2) through a feed inlet (4), and electric control valves are respectively arranged on the feed inlet (4), the discharge outlet (5), the liquid inlet (6) and the liquid outlet (7);

a controller (400) 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;

each Hall element in the non-contact detection mechanism (600) is respectively connected with the controller (400) in a signal way.

2. The graphene pumping system with buffer function according to claim 1, wherein: the induction magnetic blocks (14) are multiple, and the induction magnetic blocks (14) are uniformly arranged along the circumferential direction of the rodless piston (1).

3. The graphene pumping system with buffer function according to claim 1 or 2, wherein: the pressure transfer cylinder (300) is provided with a feeding state for pumping the slurry into the slurry cavity (2) and a discharging state for driving the slurry in the slurry cavity (2) to be pumped out from the discharging port (5);

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.

4. A graphene pumping system with buffer function according to claim 3, characterized in that: the number of the pressure transmission cylinders (300) is two.

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

6. A graphene pumping system with buffer function according to claim 3, characterized in that: 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.

7. A graphene pumping system with buffer function according to any one of claims 3, 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.

8. The graphene pumping system with buffer function according to any one of claims 1-7, 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), the right sealing ring (1.5) and the left sealing ring (1.4) are located in the corresponding annular grooves along the axial direction, and the induction magnetic block (14) is embedded on the outer side wall of the piston base block (1.1).

9. A control method of a super graphene pumping system is characterized by comprising the following steps of: comprising the graphene pumping system of claim 5, the 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 a liquid inlet (4) and a 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 to be close to the discharge port (5), the first Hall element (15.1) on the first pressure transmission cylinder (300) detects the induction magnet (14) moving along with the rodless piston (1) and gives 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 the feed port (4) and the liquid outlet (7) of the first pressure transmission cylinder (300) are opened, and meanwhile, the liquid inlet (6) and the discharge port (5) are closed, and the feed pump (200) pumps slurry into the slurry cavity (2);

s7, when the controller (400) receives a first detection signal sent by a first Hall element (15.1) on a first pressure transmission cylinder (300) and controls the first pressure transmission cylinder (300) to switch to a feeding state according to the first detection signal, 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 meanwhile, the liquid inlet (4) and the liquid outlet (7) are kept closed;

S8, when the rodless piston (1) in the first pressure transmission cylinder (300) moves to be close to the liquid outlet (7), the second Hall element (15.2) on the first pressure transmission cylinder (300) detects the induction magnetic block (14) moving along with the rodless piston (1) and gives out 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;

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).