A pressure transfer cylinder containing a magnetic switch

Abstract

The present invention discloses a graphene slurry pressure transmission cylinder, which comprises a cylinder body. Both ends of the cylinder body are sealed by end covers. A rodless piston is arranged inside the cylinder body, and the rodless piston divides the inner cavity of the cylinder body into a slurry cavity and a high-pressure water cavity. One end of the cylinder body is provided with a discharge pipe and a feed pipe, and the other end thereof is provided with a water discharge pipe and a water inlet pipe. Electric control valves are respectively arranged on the discharge pipe, the feed pipe, the water discharge pipe and the water inlet pipe. A magnetic switch for detecting the position of the rodless piston is arranged on the cylinder body; the magnetic switch comprises an induction magnetic block, a left Hall element and a right Hall element. The induction magnetic block is installed on the rodless piston, and both the left Hall element and the right Hall element are arranged on the cylinder body; A combined sealing ring is arranged between the end cover and the inner side wall of the cylinder body. The present invention provides a graphene slurry pressure transmission cylinder, which can pressurize the graphene slurry to a super high pressure exceeding 250 MPA without changing the structure of the existing plunger pump.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry pumping equipment, and specifically to a pressure transmission cylinder containing a magnetic switch. Background Art

[0002] In the industrial preparation process of graphene powder, it is extremely important to homogenize graphene slurry by using a homogenizer. Therefore, with the continuous improvement of graphene process requirements, the working pressure requirements for graphene slurry are also getting higher and higher. Among the existing liquid pumps, those that can pressurize fluids to more than 100 MPA mostly adopt a plunger pump structure. Although the existing plunger pumps can pressurize pure water to more than 250 MPA, and even up to 600 MPA, due to the limitation of the one-way valve structure used in the plunger pump itself, if the pressurized fluid is a slurry containing particles, the output pressure of the slurry after being pressurized by the existing plunger pump is much lower than that of pure water. For example, for graphene slurry, when using the existing plunger pump, it can only be pressurized to nearly 250 MPA. The reason lies in that the internal structure of the plunger pump adopts a one-way valve structure, and during the reciprocating movement of the one-way valve, the solid particles contained in the fluid will accumulate at the sealing port of the one-way valve when reciprocating in and out of the one-way valve, making it difficult for the one-way valve to achieve normal sealing. Therefore, the existing plunger pump cannot pressurize fluids containing solid particles to the same or similar pressure values as pure liquid media, which is far lower than the required 250 MPA for ultra-high pressure fluids. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems in the related art to some extent: to provide a pressure transmission cylinder containing a magnetic switch, which can pressurize graphene slurry to an ultra-high pressure exceeding 250 MPA without changing the structure of the existing plunger pump.

[0004] For this purpose, an object of the present invention is to provide a pressure transmission cylinder containing a magnetic switch, which includes a cylinder body. The cylinder body has a tubular structure, and both ends of the cylinder body are sealed by end covers so that there is a sealed inner cavity in the cylinder body. A rodless piston is provided in the cylinder body. The rodless piston is slidably engaged with the cylinder body along the axial direction and divides the inner cavity of the cylinder body into a slurry cavity and a high-pressure water cavity. One end of the cylinder body is provided with a discharge pipe and a feed pipe communicating with the slurry cavity, and the other end is provided with a water discharge pipe and a water inlet pipe communicating with the high-pressure water cavity. Electric control valves are respectively provided on the discharge pipe, the feed pipe, the water discharge pipe and the water inlet pipe. A magnetic switch for detecting the position of the rodless piston is provided on the cylinder body; the magnetic switch includes an induction magnetic block, a left Hall element and a right Hall element adapted to the induction magnetic block. The induction magnetic block is installed on the rodless piston, and the left Hall element and the right Hall element are both arranged on the cylinder body and respectively correspond to the end positions of the slurry cavity and the high-pressure water cavity facing away from each other; at least one set of combined sealing rings for the piston or the rod is provided between the inner side wall of the end cover and the cylinder body. An end cover sealing pressing plate for limiting the combined sealing ring is provided on the end cover, and the end cover sealing pressing plate is fixedly connected to the end cover.

[0005] The above technical solution has the following advantages or beneficial effects: First, an existing plunger pump can easily boost the pressure of pure water to more than 250 MPA and transport it into the high-pressure water cavity of the cylinder body only. The pressure difference on both sides of the rodless piston enables the rodless piston to be pushed to move, and at the same time, the pressure in the high-pressure water cavity is transmitted to the slurry cavity, so that the pressure in the slurry cavity rises and finally is output from the discharge pipe. In this process, the pumping medium of the plunger pump is pure water. Therefore, by using an existing plunger pump in combination with the pressure transmission cylinder of the present invention, the slurry can be boosted to a super high pressure of more than 250 MPA. Second, multiple Hall elements are used to detect the position of the induction magnetic block on the rodless piston, so that the position information of the rodless piston in the cylinder body can be obtained without damaging the integrity of the cylinder body, effectively avoiding the hard contact of over-travel at both ends of the inner cavity of the cylinder body during the reciprocating piston movement of the rodless piston, and improving the service life of the pressure transmission cylinder.

[0006] According to an example of the present invention, mounting holes are respectively provided on the outer side wall of the cylinder body corresponding to the end positions of the slurry cavity and the high-pressure water cavity facing away from each other, and the left Hall element and the right Hall element are respectively embedded in their corresponding mounting holes.

[0007] According to an example of the present invention, there are multiple induction magnetic blocks, and the multiple induction magnetic blocks are evenly arranged along the circumferential direction of the rodless piston.

[0008] According to an example of the present invention, the rodless piston includes a piston body. At both axial ends of the piston body, sealing pressing plates are respectively provided. The two sealing pressing plates are detachably connected to the piston body, and an annular groove is formed by surrounding between each sealing pressing plate and the end of the piston body. A combined sealing ring for sealing the gap between the piston body and the cylinder body is provided in the annular groove, and the induction magnetic block is embedded on the outer side wall of the piston body.

[0009] According to an example of the present invention, the sealing pressing plate includes a left sealing pressing plate and a right sealing pressing plate. The left sealing pressing plate and the left end of the piston body are fixed and surround to form a left annular groove. A left combined sealing ring is provided in the left annular groove. The right sealing pressing plate and the right end of the piston body are fixed and surround to form a right annular groove. A right combined sealing ring is provided in the right annular groove.

[0010] According to an example of the present invention, the cylinder body has a tubular structure. Both ends of the cylinder body are sealed by end covers. The end cover corresponding to the slurry chamber has a material passing hole. The discharge pipe and the feed pipe are communicated with the slurry chamber through the material passing hole on the end cover. The other end cover corresponding to the high-pressure water chamber has a water passing hole. The water discharge pipe and the water inlet pipe are communicated with the high-pressure water chamber through the water passing hole.

[0011] According to an example of the present invention, the discharge pipe and the feed pipe are communicated with a material passing hole on the corresponding end cover through a tee; and / or the water discharge pipe and the water inlet pipe are communicated with a water passing hole on the corresponding end cover through a tee.

[0012] According to an example of the present invention, the end positions of the slurry chamber and the high-pressure water chamber away from the rodless piston are communicated with the external environment through the respective corresponding air release channels on the cylinder body. An air release needle valve for opening and closing the air release channel is provided on each air release channel.

[0013] According to an example of the present invention, the cylinder body is made of a high-strength non-magnetic material.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the graphene slurry pressure transmission cylinder of the present invention without a tee.

[0016] Figure 2 is a schematic structural diagram of the graphene slurry pressure transmission cylinder of the present invention with a tee.

[0017] Figure 3 is Figure 1 a partial enlarged schematic diagram of the area "A" in

[0018] Figure 4 is Figure 1 a partial enlarged schematic view of the "B" area in

[0019] Figure 5 is Figure 3 a sectional schematic view in the "C-C" direction of

[0020] Wherein, 1. cylinder block; 2. rodless piston; 3. slurry chamber; 4. high-pressure water chamber; 5. discharge pipe; 6. feed pipe; 7. water outlet pipe; 8. water inlet pipe; 9. piston body; 10. left sealing pressing plate; 11. left annular groove; 12. left combined sealing ring; 13. right sealing pressing plate; 14. right annular groove; 15. right combined sealing ring; 16. central through hole; 17. central screw hole; 18. end cover; 19. material passing hole; 20. water passing hole; 21. left three-way joint; 22. right three-way joint; 23. combined sealing ring; 24. end cover sealing pressing plate; 25. air release channel; 26. air release needle valve; 27. electric control valve; 28. induction magnetic block; 29. left Hall element; 30. right Hall element; 31. mounting hole. Specific embodiments

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0022] The graphene slurry pressure transmission cylinder according to the embodiments of the present invention will be described in detail below with reference to the drawings.

[0023] The present invention provides a graphene slurry pressure transmission cylinder. As shown in the figure, it includes a cylinder block 1. The cylinder block 1 has a sealed inner cavity as a piston cavity. A rodless piston 2 is arranged in the piston cavity of the cylinder block 1. The outer side wall of the rodless piston 2 is attached to the inner side wall of the cylinder block and is slidably matched with the cylinder block 1 along the axial direction. The rodless piston 2 divides the piston cavity of the cylinder block 1 into a slurry chamber 3 and a high-pressure water chamber 4, as Figure 1 and Figure 2As shown in the figure, the slurry chamber 3 is located on the left side of the rodless piston 2, and the high-pressure water chamber 4 is located on the right side of the rodless piston 2. The left end of the cylinder block 1 is provided with a discharge pipe 5 and a feed pipe 6, and both the discharge pipe 5 and the feed pipe 6 communicate with the slurry chamber 3. The right end of the cylinder block 1 is provided with a water discharge pipe 7 and a water inlet pipe 8, and both the water discharge pipe 7 and the water inlet pipe 8 communicate with the high-pressure water chamber 4. Electric control valves 27 are respectively provided on the discharge pipe 5, the feed pipe 6, the water discharge pipe 7 and the water inlet pipe 8. A magnetic switch for detecting the position of the rodless piston 2 is provided on the cylinder block 1. The position information of the rodless piston 2 in the cylinder block 1 can be directly obtained through the magnetic switch. When the rodless piston 2 moves leftward as shown in the figure and squeezes the slurry chamber 3 to pump the slurry, if the rodless piston 2 moves leftward to the limit position, the magnetic switch can give a control signal so that the rodless piston 2 stops before touching the left end face of the slurry chamber 3. Similarly, when the rodless piston 2 moves rightward and squeezes the high-pressure water chamber 4 to replenish the slurry in the slurry chamber 3, if the rodless piston 2 moves rightward to the limit position, the magnetic switch can also timely give a control signal so that the rodless piston 2 stops before touching the right end face of the high-pressure water chamber 4. Therefore, the hard contact between the rodless piston and the two ends of the inner cavity of the cylinder block 1 can be avoided to the greatest extent.

[0024] Furthermore, in the pressure transmission cylinder of this embodiment, each electric control valve 27 and the magnetic switch are electrically connected to the controller. The controller receives the detection signal of the magnetic switch and controls the opening or closing of the pipelines where each electric control valve is located through the detection signal.

[0025] The function of each electric control valve 27 in this embodiment is to be able to open and close its respective pipeline under the control of the controller, and it can be any commercially available electric control valve in the prior art that can be used to control the opening and closing of the pipeline.

[0026] As one of the preferred examples of the magnetic switch, the magnetic switch is a Hall sensor, which includes an induction magnet block 28 and at least two Hall elements. Each Hall element is adapted to the induction magnet block 28 so that when the induction magnet block 28 approaches the corresponding Hall element, the Hall element can give a detection signal. Specifically, the Hall elements include a left Hall element 29 and a right Hall element 30. The induction magnet block 28 is installed on the rodless piston 2. The left Hall element 29 and the right Hall element 30 are arranged along the axial direction of the cylinder block 1. And the left Hall element 29 is located at the left end position on the outer side wall of the cylinder block 1 corresponding to the slurry chamber 3 far from the high-pressure water chamber 4, and the right Hall element 30 is located at the right end position on the outer side wall of the cylinder block 1 corresponding to the high-pressure water chamber 4 far from the slurry chamber 3. Each Hall element is signal-connected to the controller. The purpose of setting the above-mentioned left Hall element 29 and right Hall element 30 is that when the induction magnet block 28 carried by the rodless piston 2 moves left and right, it can give a detection signal when approaching the left Hall element 29 or the right Hall element 30, so as to timely obtain the current position of the rodless piston 2 of the cylinder. According to the actual practical situation, the positions of the left Hall element 29 and the right Hall element 30 can be adjusted axially adaptively, so that when the rodless piston 2 moves to the left or right extreme position, there is enough safety distance from the two ends of the inner cavity of the cylinder block 1 to avoid hard contact between the rodless piston 2 and the inner cavity of the cylinder block 1. Specifically, when the rodless piston 2 drives the induction magnet block 28 to move left and approach the left Hall element 29, the left Hall element 29 responds to the position change of the induction magnet block 28 and gives a detection signal. Under the control of the detection signal of the left Hall element 29, the rodless piston 2 stops before touching the left end position of the slurry chamber 3. When the rodless piston 2 drives the induction magnet block 28 to move right and approach the right Hall element 30, the right Hall element 30 responds to the position change of the induction magnet block 28 and gives a detection signal. Under the control of the detection signal of the right Hall element 30, the rodless piston 2 stops before touching the right end position of the high-pressure water chamber 4.

[0027] As a preference of the above embodiment, through the Hall sensor, the position of the rodless piston 2 can be detected by the Hall element while keeping the cylinder block 1 intact. In order to enable the Hall element to better cross the side wall of the cylinder block 1 and thus sense the position of the induction magnet block 28, the cylinder block 1 is preferably made of a high-strength non-magnetic material while ensuring the wall thickness. Further, the whole of the cylinder block 1 is made of stainless steel. The steel with a yield strength defined by the International Iron and Steel Institute between 210 and 550 MPA is high-strength steel, and above 550 MPA is ultra-high-strength steel; or the position on the cylinder block 1 corresponding to the moving stroke of the induction magnet block 28 is made of stainless steel. Furthermore, during the axial movement of the rodless piston in the cylinder block 1, the axial impact force is relatively large. The two ends of the cylinder block 1 can increase the wall thickness to improve the compressive strength of the cylinder block 1.

[0028] As a further improvement of one of the preferred examples of this embodiment, mounting holes 31 are respectively provided on the outer side wall of the cylinder block 1 corresponding to the end positions where the slurry chamber 3 and the high-pressure water chamber 4 face away from each other, and the left Hall element 29 and the right Hall element 30 are respectively embedded in their corresponding mounting holes 31. Since the slurry in the cylinder block 1 of this embodiment needs to be pressurized to ultra-high pressure, the wall thickness of the cylinder block 1 is relatively large. The relatively thick side wall of the cylinder block 1 will weaken the ability of the external Hall element to detect the induction magnet 28 in the cylinder block 1. The added mounting holes 31 can not only better position the mounting position of the Hall element along the axial direction, but also the wall thickness of the cylinder block 1 in the area where the bottom of the groove of the mounting hole 31 is located is relatively thin. Thus, when the induction magnet 28 moves to the position where the mounting hole 31 is located, the Hall element can better detect the induction magnet 28, and finally make the detection of the Hall element more sensitive and accurate.

[0029] As Figure 5 shown, as a further improvement of one of the preferred examples of this embodiment, there are a plurality of induction magnets 28, and the plurality of induction magnets 28 are uniformly arranged along the circumferential direction of the rodless piston 2. Specifically, each induction magnet 28 is embedded in the outer side wall of the rodless piston 2. As another improvement of one of the preferred examples of this embodiment, the induction magnet 28 has an annular structure. Since the rodless piston 2 is not restricted in the circumferential direction relative to the cylinder block 1 during the axial piston movement of the rodless piston 2, when the rodless piston 2 rotates and deviates in the circumferential direction, the induction magnet 28 will move away from the Hall element. The process of the induction magnet 28 moving away along the circumferential direction will cause a change in the magnetic field position and affect the detection sensitivity of the Hall element outside the cylinder block 1. In this embodiment, by arranging a plurality of induction magnets 28 along the circumferential direction or arranging the induction magnet 28 into an annular structure extending along the circumferential direction, the influence of the circumferential rotation of the rodless piston 2 on the detection of the Hall element is eliminated to the greatest extent, and the stability of the Hall element detection process is ensured.

[0030] Based on the improvements of the above embodiments, the rodless piston 2 serves to isolate the slurry chamber 3 and the high-pressure water chamber 4. At the same time, as the rodless piston 2 moves, the volumes of the slurry chamber 3 and the high-pressure water chamber 4 alternately increase or decrease. Specifically, the rodless piston 2 includes a piston body 9, and the piston body 9 is configured to match the piston chamber of the cylinder block 1, so that a sliding fit is formed between the outer side wall of the piston body 9 and the inner side wall of the piston chamber. Sealing pressing plates are respectively provided at both axial ends of the piston body 9, and the two sealing pressing plates are respectively detachably connected to both ends of the piston body 9. Annular grooves are respectively formed by the outer side wall of the piston body 9 near both ends and the corresponding sealing pressing plates. A combined sealing ring is provided in the annular groove, and the combined sealing ring is axially limited in the annular groove. The outer side wall of the combined sealing ring is in close contact with the inner side wall of the piston chamber of the cylinder block 1, so as to seal the gap between the piston body 9 and the cylinder block 1 through the combined sealing ring. The induction magnet 28 is embedded on the outer side wall of the piston body 9.

[0031] In some embodiments, the two sealing pressing plates include a left sealing pressing plate 10 located at the left end of the piston body 9 and a right sealing pressing plate 13 located at the right end of the piston body 9. The left sealing pressing plate 10 and the left end of the piston body 9 are fixed and enclose a left annular groove 11, and a left combined sealing ring 12 is provided in the left annular groove 11. The right sealing pressing plate 13 and the right end of the piston body 9 are fixed and enclose a right annular groove 14, and a right combined sealing ring 15 is provided in the right annular groove 14.

[0032] As Figure 3 shown, the left sealing pressing plate 10 and / or the right sealing pressing plate 13 has a central through hole 16 provided along its own axis and fastening screws arranged circumferentially around the central through hole 16. A central screw hole 17 corresponding to the central through hole 16 is provided on the end surface of the piston body 9 corresponding to the central through hole 16. Further, the left sealing pressing plate 10 and the right sealing pressing plate 13 have a central through hole 16 provided along their own axes and fastening screws arranged circumferentially around the central through hole 16. Central screw holes 17 corresponding to the central through hole 16 are provided on the left end surface and the right end surface of the piston body 9. Through the central screw hole 17, when an operator assembles or repairs the rodless piston 2 in the cylinder block 1, an external maintenance screw can pass axially through the central through hole 16 from the side where the high-pressure water chamber 4 is located and be threadedly connected to the central screw hole 17, so that the rodless piston 2 can be pushed and pulled to axially displace the rodless piston 2 out of the cylinder block 1 or be reset into the cylinder block 1.

[0033] In some embodiments, the cylinder block 1 has a tubular structure. The left end and the right end of the cylinder block 1 are respectively sealed by an end cover 18. The left end cover 18 has a material passing hole 19. The discharge pipe 5 and the feed pipe 6 communicate with the slurry chamber 3 through the material passing hole 19 on the left end cover 18. The right end cover 18 has a water passing hole 20. The water discharge pipe 7 and the water inlet pipe 8 communicate with the high-pressure water chamber 4 through the water passing hole 20 on the right end cover 18.

[0034] As one of the preferred examples of this embodiment: As Figure 2 shown, the discharge pipe 5 and the feed pipe 6 communicate with a material passing hole 19 on the corresponding end cover 18 through a left three-way joint 21.

[0035] As another preferred example of this embodiment: As Figure 1 shown, the left end cover 18 of the cylinder block 1 has two material passing holes 19. The discharge pipe 5 and the feed pipe 6 respectively communicate with the corresponding material passing holes 19 on the left end cover 18.

[0036] As the third preferred example of this embodiment: As Figure 2 shown, the water discharge pipe 7 and the water inlet pipe 8 communicate with a water passing hole 20 on the corresponding end cover 18 through a right three-way joint 22.

[0037] As the fourth preferred example of this embodiment: As Figure 1 shown, the right end cover 18 of the cylinder block 1 has two water passing holes 20. The water discharge pipe 7 and the water inlet pipe 8 respectively communicate with the corresponding water passing holes 20 on the right end cover 8.

[0038] In some embodiments, the cylinder block 1 has a tubular structure. End caps 18 for sealing the cylinder block 1 are respectively provided at both ends of the cylinder block 1. A part of the end cap 18 is configured to match the inner cavity of the cylinder block 1, so that the part of the end cap 18 that matches the inner cavity of the cylinder block 1 is inserted into the cylinder block 1. To improve the sealing performance between the end cap 18 and the cylinder block 1, the improvement in this embodiment is that: at least one set of combined sealing rings 23 for pistons or rods is provided between the inner side wall of the end cap 18 and the cylinder block 1. An end cap sealing pressing plate 24 for limiting the combined sealing ring 23 is provided on the end cap 18, and the end cap sealing pressing plate 24 is fixedly connected to the end cap 18. Specifically, the end cap sealing pressing plate 24 is fixed to the end face of the corresponding end cap 18 located inside the cylinder block 1. The end cap sealing pressing plate 24 and the end cap 18 enclose an annular installation groove for accommodating the combined sealing ring 23. The combined sealing ring 23 is axially limited in the annular installation groove, and the combined sealing ring 23 is in close contact with the inner side wall of the cylinder block 1 to achieve a sealing effect. The combined sealing ring 23 in this embodiment adopts an existing combined sealing ring 23 for pistons or an existing combined sealing ring 23 for rods. The combined sealing ring 23 for pistons refers to the general term for various combined sealing rings suitable for piston sealing, and the combined sealing ring 23 for rods refers to the general term for various combined sealing rings for piston rod sealing. The above combined sealing rings are all existing conventional components and will not be elaborated here one by one.

[0039] As Figure 1 and Figure 4 shown, air release channels 25 communicating with the slurry chamber 3 and air release channels 25 communicating with the high-pressure water chamber 4 are respectively provided on the outer side walls at both ends of the cylinder block 1. One ends of the two air release channels 25 are respectively communicated with the end positions of the corresponding slurry chamber 3 and high-pressure water chamber 4 that are away from the rodless piston 2, and the other ends of the two air release channels 25 extend to the outer side wall of the cylinder block 1 and are communicated with the external environment outside the cylinder block 1 through the air holes on the outer side wall of the cylinder block 1. An air release needle valve 26 is provided on each air release channel 25. The air release needle valve 26 keeps the air release channel 25 in a normally closed state, and when there is air in the air release channel 25, the air can be discharged through the opening and closing of the air release needle valve 26. Specifically, the air release channel 25 located at the left end of the cylinder block 1 is communicated with the slurry chamber 3, and the air release channel 25 located at the right end of the cylinder block 1 is communicated with the high-pressure water chamber 4.

[0040] As a preference, as Figure 4 shown, the first air release channel 25 in the two air release channels 25 is communicated with the slurry chamber 3. The connection position of the first air release channel 25 and the slurry chamber 3 is located at a position along the axis of the slurry chamber 3 close to the end cap 18 at the left end of the cylinder block 1. Specifically, the first air release channel 25 is aligned with the right end face of the end cap sealing pressing plate 24 located in the slurry chamber 3.

[0041] Preferably, the second air release channel 25 of the two air release channels 25 communicates with the high-pressure water chamber 4. The connection between the second air release channel 25 and the high-pressure water chamber 4 is located at a position on the high-pressure water chamber 4 axially close to the right end cover 18 of the cylinder block 1. Specifically, the second air release channel 25 is aligned with the left end face of the end cover sealing pressing plate 24 located in the high-pressure water chamber 4.

[0042] Working principle of the present invention:

[0043] The existing plunger pump sends the pressurized pure liquid medium from the water inlet pipe 8, for example, pure water. At this time, the pressure of the pure water can reach an ultra-high pressure of 600 MPA. The ultra-high pressure pure water enters the high-pressure water chamber 4 in the cylinder block 1 through the water inlet pipe 8 and the water passing hole. At this time, the pressure in the high-pressure water chamber 4 is greater than the pressure in the slurry chamber 3. Under the action of the pressure difference on both sides of the rodless piston 2, the rodless piston 2 moves leftward until the pressures on both sides are balanced, that is, the pressure in the slurry chamber 3 rises to the same or nearly the same as the pressure in the high-pressure water chamber 4. Then, the slurry in the slurry chamber 3 is discharged from the material passing hole and pumped to the next process through the discharge pipe 5. During this process, the pressure of the slurry pumped out from the discharge pipe 5 is much greater than the pressure that can be achieved by only using the plunger pump to pressurize the slurry. After the slurry in the slurry chamber 3 is emptied, the high-pressure water chamber 4 is depressurized, and then the feeding pump replenishes the slurry into the slurry chamber 3, and so on, so that the pressure transfer cylinder of this embodiment can periodically output ultra-high pressure slurry exceeding 250 MPA.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0045] For those skilled in the art, various changes and corrections will undoubtedly be obvious after reading the above description. Therefore, the appended claims should be regarded as covering all changes and corrections that embrace the true intent and scope of the present invention. Any and all equivalent scopes and contents within the scope of the claims should be considered to still fall within the intent and scope of the present invention.

Claims

1. A pressure transmission cylinder containing a magnetic switch, which comprises a cylinder body (1). The cylinder body (1) has a tubular structure, and both ends of the cylinder body (1) are sealed by end covers (18). The cylinder body (1) has a closed inner cavity, and is characterized in that: The cylinder body (1) is provided with a rodless piston (2), which is slidably matched with the cylinder body (1) along the axial direction and divides the inner cavity of the cylinder body (1) into a slurry cavity (3) and a high-pressure water cavity (4); one end of the cylinder body (1) is provided with a discharge pipe (5) and a feed pipe (6) connected to the slurry cavity (3); the other end of the cylinder body (1) is provided with a water discharge pipe (7) and a water inlet pipe (8) connected to the high-pressure water cavity (4); the discharge pipe (5), the feed pipe (6), the water discharge pipe (7) and the water inlet pipe (8) are respectively provided with an electric control valve (27); and the cylinder body (1) is provided with a detection mechanism for detecting the position of the rodless piston (2); The detection mechanism comprises an induction magnetic block (28) and a left Hall element (29) and a right Hall element (30) adapted to the induction magnetic block (28); the induction magnetic block (28) is mounted on the rodless piston (2); the left Hall element (29) and the right Hall element (30) are both arranged on the cylinder body (1) and correspond to the end positions of the slurry chamber (3) and the high-pressure water chamber (4) which are separated from each other; At least one set of combined sealing rings (23) for the piston or the rod is provided between the end cover (18) and the inner side wall of the cylinder body (1); an end cover sealing pressure plate (24) for limiting the combined sealing ring (23) is provided on the end cover (18); the end cover sealing pressure plate (24) is fixedly connected to the end cover (18); The outer wall of the cylinder body (1) has mounting holes (31) at the end positions corresponding to the slurry chamber (3) and the high-pressure water chamber (4) which are separated from each other, and the left Hall element (29) and the right Hall element (30) are respectively embedded in the corresponding mounting holes (31); The rodless piston (2) comprises a piston body (9), and sealing pressure plates are respectively provided at two ends of the piston body (9) in the axial direction, and the two sealing pressure plates are respectively detachably connected to the piston body (9), and an annular groove is formed between each sealing pressure plate and the end of the piston body (9), and a combined sealing ring for sealing the gap between the piston body (9) and the cylinder body (1) is provided in the annular groove, and the induction magnetic block (28) is embedded on the outer side wall of the piston body (9); The sealing pressure plate comprises a left sealing pressure plate (10) and a right sealing pressure plate (13); the left sealing pressure plate (10) and the left end of the piston body (9) are fixed and enclosed to form a left annular groove (11); a left combined sealing ring (12) is arranged in the left annular groove (11); the right sealing pressure plate (13) and the right end of the piston body (9) are fixed and enclosed to form a right annular groove (14); a right combined sealing ring (15) is arranged in the right annular groove (14); The end cover (18) corresponding to the slurry chamber (3) has a material passing hole (19), and the discharge pipe (5) and the feed pipe (6) are connected to the slurry chamber (3) through the material passing hole (19) on the end cover (18). The other end cover (18) corresponding to the high-pressure water chamber (4) has a water passing hole (20), and the water discharge pipe (7) and the water feed pipe (8) are connected to the high-pressure water chamber (4) through the water passing hole (20).

2. The pressure transmission cylinder containing a magnetic switch according to claim 1, characterized in that: The induction magnets (28) are multiple, and the multiple induction magnets (28) are uniformly arranged along the circumferential direction of the rodless piston (2).

3. The pressure transmission cylinder containing a magnetic switch according to claim 1, characterized in that: The discharge pipe (5) and the feed pipe (6) are communicated with a material passing hole (19) on the corresponding end cover (18) through a tee joint; And / or the water discharge pipe (7) and the water inlet pipe (8) are communicated with a water passing hole (20) on the corresponding end cover (18) through a tee joint.

4. The pressure transmission cylinder containing a magnetic switch according to claim 1, wherein: The end positions of the slurry chamber (3) and the high-pressure water chamber (4) away from the rodless piston (2) are communicated with the external environment through respective air release channels (25) on the cylinder block (1), and air release needle valves (26) for opening and closing the air release channels (25) are provided on each of the air release channels (25).

5. The pressure transfer cylinder containing a magnetic switch according to claim 1, characterized in that: The cylinder block 1 is made of a high-strength non-magnetic material.

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