One-way valve for ultrahigh pressure pump

Abstract

The invention relates to the technical field of one-way valves, and discloses a one-way valve for a super-pressure pump, which is applied to the super-pressure pump and comprises a front buffer pipe and a one-way runner pipe, a vertical branch pipe is vertically arranged on the one-way runner pipe, a first piston is slidably connected to the inner wall of the vertical branch pipe, and a plug is fixedly connected to the lower portion of the first piston through a connecting rod. A valve seat is arranged at the position, corresponding to the lowest sliding position of the plug, of the one-way circulating pipe, the space, above the first piston, of the vertical branch pipe is a vertical branch pipe cavity, and the vertical branch pipe cavity is filled with hydraulic oil; an inclined branch pipe is obliquely arranged on the front buffer pipe, a third piston is slidably connected to the inner wall of the inclined branch pipe, a baffle is fixedly connected to the lower portion of the third piston through a connecting rod and located in the front buffer pipe, the space, above the third piston, of the inclined branch pipe is an inclined branch pipe cavity, and the inclined branch pipe cavity is communicated with the vertical branch pipe cavity. The problem that in the prior art, a spring assembly bears large impact force in a short time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly to a check valve for an ultra-high pressure pump. Background Art

[0002] In modern industrial production, especially in many fields involving ultra-high pressure operations, the check valve for an ultra-high pressure pump plays a crucial role. As the core component to ensure the stable and safe operation of the fluid system, it shoulders the important task of controlling the unidirectional flow of the fluid. However, a series of problems that need to be solved urgently have emerged in the actual application process of the current traditional check valves for ultra-high pressure.

[0003] The check valve in the prior art, such as a hand oil pump check valve with the patent publication number CN101440885A, includes a valve disc, a spring, a valve seat with a through valve hole, and an outer cover connected to the valve seat. The valve disc and the spring are sequentially arranged between the valve seat and the outer cover, and the valve disc is hermetically fitted with the valve seat through the spring. There is at least one fluid passage on the outer cover that can communicate with the through valve hole. After using this structure, this check valve is integrally press-fitted as a single component at the inner end of the oil inlet passage and the end of the oil outlet passage close to the chamber. The sealing positions are all within this check valve, and only this check valve needs to be installed at both ends, so that the machining difficulty of the oil inlet passage and the oil outlet passage is small. In addition, the return of the valve disc depends on the elastic force of the spring, so that the valve disc can be placed obliquely and the return of the valve disc is reliable. However, its spring assembly faces severe challenges during operation.

[0004] Under ultra-high pressure environments, the instantaneous impact force of the fluid is extremely powerful, which causes the spring assembly to bear a huge impact load in a short time. Frequent exposure to such high-intensity impacts makes the spring assembly extremely prone to fatigue damage, seriously affecting the durability of the check valve and significantly shortening its service life. Once the check valve fails, it will not only affect the continuity of the entire production process, but may also cause serious safety hazards such as fluid backflow and pressure out-of-control, thereby resulting in huge economic losses. Summary of the Invention

[0005] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a check valve for an ultra-high pressure pump, which has the advantages of improving durability, optimizing opening performance, and being easy to maintain, and solves the problems in the prior art that the spring assembly is subjected to a large impact force in a short time, has poor durability, and safety hazards caused by the failure of the check valve.

[0006] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solutions: A check valve for a ultra-high pressure pump, which is applied to an ultra-high pressure pump, includes a pre-buffer pipe and a one-way flow pipe that are sequentially arranged on the output pipe of the ultra-high pressure pump. A vertical branch pipe is vertically arranged on the one-way flow pipe. A first piston is slidably connected to the inner wall of the vertical branch pipe. A plug is fixedly connected to the lower part of the first piston through a connecting rod. A valve seat is arranged on the one-way flow pipe at the position corresponding to the lowest point where the plug slides to. The space above the first piston in the vertical branch pipe is the vertical branch pipe cavity, and the vertical branch pipe cavity is filled with hydraulic oil; An inclined branch pipe is obliquely arranged on the pre-buffer pipe. A third piston is slidably connected to the inner wall of the inclined branch pipe. A baffle is fixedly connected to the lower part of the third piston through a connecting rod. The baffle is located in the pre-buffer pipe. The space above the third piston in the inclined branch pipe is the inclined branch pipe cavity, and the inclined branch pipe cavity is communicated with the vertical branch pipe cavity; When the ultra-high pressure pump is not working, the pressure in the pre-buffer pipe and the one-way flow pipe is low. Under the high pressure of the vertical branch pipe cavity, the plug blocks downward in the one-way flow pipe. When the ultra-high pressure pump is working, high-pressure air or water is first filled into the pre-buffer pipe. The baffle drives the third piston to slide downward under the action of the fluid, reducing the pressure in the inclined branch pipe cavity. Since the inclined branch pipe cavity is communicated with the vertical branch pipe cavity, the pressure in the vertical branch pipe cavity decreases, making it easier for the fluid to push the plug upward when it reaches the valve seat position of the one-way flow pipe, avoiding damage to the sealing structure caused by the impact of high-pressure fluid in an instant.

[0007] Preferably, the third piston is a multi-stage sleeve buffer structure. The third piston includes an outer sleeve and an inner sleeve sleeved inside the outer sleeve. The bottom of the inner sleeve abuts against the inner base in the inclined branch pipe. A connecting column is arranged at the middle position of the third piston. The connecting column passes through the base and connects the baffle. A locking mechanism is arranged on the contact surface between the outer sleeve and the inner sleeve. The locking mechanism is used to lock the outer sleeve and the inner sleeve when the baffle is not impacted by the fluid, avoiding the third piston from sliding when manually adjusting the pressure in the vertical branch pipe cavity.

[0008] Preferably, the locking mechanism includes a magnetic head that slides in the inner sleeve housing. The magnetic head is connected to the inner sleeve through a spring. A groove is arranged on the outer sleeve at the position corresponding to the magnetic head in the unfolded state; A partition is fixed on the outer side of the connecting column. The outer side of the partition fits against the inner wall of the outer sleeve. A repulsive magnetic force is arranged between the outer side of the partition and the inner side of the locking mechanism. When the outer sleeve and the inner sleeve are unfolded, the partition is attached to the position of the locking mechanism. Under the action of the repulsive magnetic force, the magnetic head slides outward and abuts in the groove of the outer sleeve to complete the locking between the outer sleeve and the inner sleeve.

[0009] Preferably, the connecting column and the outer sleeve are arranged in a connection relationship that allows relative sliding within a small range. When the baffle is impacted, the connecting column first slides a short distance relative to the outer sleeve, causing the partition to disengage from the locking mechanism and contacting the magnetic suction head to unlock the outer sleeve and the inner sleeve. An inner column is arranged at the connection of the connecting column in the outer sleeve. The end of the inner column slides within the connecting column, and a return spring is arranged in the sliding cavity of the connecting column.

[0010] Preferably, an artificial adjustment device is arranged in the vertical branch pipe, including a second piston that slides on the inner wall of the vertical branch pipe. The cavity of the vertical branch pipe is the space between the second piston and the first piston. The upper part of the cavity of the vertical branch pipe is connected to a manual lifting device through a lead screw. The lead screw is threadedly connected to a threaded seat on the end cover of the vertical branch pipe. When the manual lifting device is rotated, the second piston is driven to lift and lower, thereby adjusting the pressure in the cavity of the vertical branch pipe.

[0011] Preferably, an angle adjustment device is also arranged in the inclined branch pipe for adjusting the inclination angle of the baffle. The angle adjustment device includes a cable. One end of the cable located outside the inclined branch pipe is provided with a driving device, and the other end of the cable passes through the outer sleeve and the connecting column and is connected to the baffle. One end of the baffle is rotatably connected to the connecting column, and the other end is movably connected to the cable. When the cable slides through the driving device, the inclination angle of the baffle is adjusted.

[0012] Preferably, the driving device is arranged on the end cover of the inclined branch pipe away from the pre-buffer pipe, including an oil cylinder fixed to the inclined branch pipe by bolts. The end of the telescopic rod of the oil cylinder is fixedly connected to the end of the cable. The telescopic direction of the telescopic rod of the oil cylinder is parallel to the sliding direction of the cable. The oil cylinder is used to control the inclination angle of the baffle. Before the ultra-high pressure pump starts, the cable controls the baffle to be in an inclined state. After the ultra-high pressure pump starts, the baffle drives the connecting column to slide down under the action of the fluid. After the plug is opened, the oil cylinder is controlled to drive the cable to slide down, reducing the inclination angle of the baffle or making the baffle parallel to the fluid flow direction, thereby reducing the blocking effect of the baffle on the fluid during normal operation. At this time, the control of the cable by the oil cylinder is a small-span up and down sliding.

[0013] Preferably, a boss is arranged on the part of the cable located inside the connecting column. The diameter of the connecting column is larger than the diameter of the through hole in the inner column through which the cable passes. After the ultra-high pressure pump stops working, in order to improve the speed and accuracy of the reset of the third piston, the oil cylinder is controlled to drive the cable to slide up in a large span, and the inner column is pushed up by the boss, that is, the third piston is quickly reset.

[0014] Preferably, a sliding groove is arranged at the connection of the baffle and the cable. The cable passes through the sliding groove and a detachable limit ball is arranged at the end.

[0015] Preferably, the oil cylinder is connected with a pressure regulating system, which can automatically adjust the telescopic amount of the telescopic rod of the oil cylinder according to the change of the output pressure of the ultra-high pressure pump, so as to accurately control the tilt angle of the baffle plate to meet the requirements of the fluid blocking effect under different pressure conditions.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a check valve for an ultra-high pressure pump, which has the following beneficial effects: 1. For the check valve for the ultra-high pressure pump, a pre-buffer pipe and a one-way flow pipe are sequentially arranged on the output pipe of the ultra-high pressure pump. An inclined branch pipe and a vertical one-way flow pipe are respectively arranged on the pre-buffer pipe and the one-way flow pipe. The high-pressure fluid output from the ultra-high pressure pump first passes through the pre-buffer pipe. The baffle plate is driven by the fluid impact to drive the third piston to slide down, thereby reducing the pressure in the inclined branch pipe cavity and the vertical branch pipe cavity in advance, making it easier to push open the plug head when the fluid impacts below the plug head, avoiding damage to the sealing structure in the vertical branch pipe caused by high-pressure impact, and at the same time separating the vertical branch pipe from the pipeline, which is more convenient for the maintenance of the sealing components in the vertical branch pipe and the adjustment of the pressure.

[0017] 2. For the check valve for the ultra-high pressure pump, the third piston is set as a two-stage sleeve structure, and a locking mechanism is arranged at the connection of the outer sleeve and the inner sleeve to lock the outer sleeve and the inner sleeve when the baffle plate is not impacted by the fluid, avoiding the sliding of the third piston when manually adjusting the pressure in the vertical branch pipe cavity. At the same time, the sliding connection of multiple sleeves significantly improves the buffering ability of the third piston, avoiding damage to the third piston caused by excessive impact force.

[0018] 3. For the check valve for the ultra-high pressure pump, by arranging an angle adjustment device in the inclined branch pipe and adjusting the tilt angle of the baffle plate by using a cable, the baffle plate is kept tilted before the ultra-high pressure pump starts to work, so as to drive the third piston to slide when the fluid passes for the first time. After the fluid passes, that is, when the ultra-high pressure pump is working normally, the baffle plate is controlled to be parallel to the fluid to reduce the impact force.

[0019] 4. For the check valve for the ultra-high pressure pump, by arranging a convex platform on the cable, after the ultra-high pressure pump stops working, in order to improve the speed and accuracy of the reset of the third piston, the oil cylinder is controlled to drive the cable to slide upwards in a large span, and the inner column is pushed up by the convex platform, that is, the third piston is quickly reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a sectional view of the overall structure of the present invention.

[0022] Figure 3Schematic diagram of the unidirectional flow pipe of the present invention.

[0023] Figure 4 Exploded view of the unidirectional flow pipe of the present invention.

[0024] Figure 5 Cross-sectional view of the unidirectional flow pipe of the present invention, where the arrow in the figure represents the flow direction of the fluid.

[0025] Figure 6 Schematic diagram of the pre-buffer pipe of the present invention.

[0026] Figure 7 Cross-sectional view of the pre-buffer pipe of the present invention, where the arrow in the figure represents the flow direction of the fluid.

[0027] Figure 8 Schematic diagram of the No. 3 piston of the present invention.

[0028] Figure 9 Cross-sectional view of the No. 3 piston of the present invention.

[0029] Figure 10 For the present invention Figure 9 Enlarged view of area A in.

[0030] Figure 11 For the present invention Figure 9 Enlarged view of area B in.

[0031] Figure 12 For the present invention Figure 9 Enlarged view of area C in.

[0032] Figure 13 Enlarged view of the driving structure at the end of the cable of the present invention.

[0033] In the figure: 1. Ultra-high pressure pump; 2. Pre-buffer pipe; 3. Inclined branch pipe; 31. Baffle; 32. No. 3 piston; 33. Cable; 34. Oil cylinder; 321. Outer sleeve; 322. Inner sleeve; 323. Connecting column; 324. Partition; 325. Locking mechanism; 3211. Inner column; 3251. Magnetic head; 3252. Spring; 331. Boss; 30. Inclined branch pipe cavity; 311. Chute; 4. Unidirectional flow pipe; 5. Vertical branch pipe; 51. Plug; 52. No. 1 piston; 53. No. 2 piston; 54. Manual lifting device; 50. Vertical branch pipe cavity. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] In addition, a fixed connection means a connection in which parts or components are fixed without any relative movement; a transmission connection means a connection method in which mechanical motion or torque is transmitted to other working components through transmission parts; a sliding connection means a connection method in which two objects are in contact but not fixed and can slide relative to each other; a rotational connection means a connection method in which two objects are in contact but not fixed and can rotate relative to each other.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0038] Embodiment 1: This embodiment provides a check valve for a super high-pressure pump, having the following technical features.

[0039] Please refer to Figure 1-13 , a check valve for a super high-pressure pump, which is applied to a super high-pressure pump 1 and includes a pre-buffer pipe 2 and a one-way flow pipe 4 sequentially arranged on the output pipe of the super high-pressure pump 1. A vertical branch pipe 5 is vertically arranged on the one-way flow pipe 4. A first piston 52 is slidably connected to the inner wall of the vertical branch pipe 5. A plug 51 is fixedly connected to the lower part of the first piston 52 through a connecting rod. A valve seat is arranged on the one-way flow pipe 4 at the position corresponding to the lowest position where the plug 51 slides. The space above the first piston 52 in the vertical branch pipe 5 is a vertical branch pipe cavity 50, and the vertical branch pipe cavity 50 is filled with hydraulic oil; An inclined branch pipe 3 is disposed obliquely on the front buffer pipe 2. A third piston 32 is slidably connected to the inner wall of the inclined branch pipe 3. A baffle 31 is fixedly connected to the lower part of the third piston 32 through a connecting rod. The baffle 31 is located inside the front buffer pipe 2. The space of the inclined branch pipe 3 above the third piston 32 is an inclined branch pipe cavity 30, and the inclined branch pipe cavity 30 communicates with the vertical branch pipe cavity 50.

[0040] Working principle: When the ultra-high pressure pump 1 is not working, the pressures in the front buffer pipe 2 and the one-way flow pipe 4 are low. Under the high pressure of the vertical branch pipe cavity 50, the plug 51 blocks downward in the one-way flow pipe 4. When the ultra-high pressure pump 1 works, the front buffer pipe 2 is first filled with high-pressure air or water flow. The baffle 31 drives the third piston 32 to slide downward under the action of the fluid, reducing the pressure in the inclined branch pipe cavity 30. Since the inclined branch pipe cavity 30 communicates with the vertical branch pipe cavity 50, the pressure in the vertical branch pipe cavity 50 decreases, enabling the fluid to more easily push the plug 51 upward when reaching the valve seat position of the one-way flow pipe 4, avoiding damage to the sealing structure caused by the impact of high-pressure fluid in an instant.

[0041] It should be noted that the inclination direction of the inclined branch pipe 3 is: the end far from the front buffer pipe 2 is close to the direction of the fluid coming, and the end close to the front buffer pipe 2 is close to the direction of the fluid flow.

[0042] It should be noted that the inclination angle of the baffle 31 is 0 - 15 degrees.

[0043] It should be noted that the outer side of the first piston 52 is closely attached to the inner wall of the vertical branch pipe 5 to maintain sealing.

[0044] It should be noted that the outer side of the third piston 32 is closely attached to the inner wall of the inclined branch pipe 3 to maintain sealing.

[0045] It should be noted that a pressure monitoring sensor is provided at the valve seat of the one-way flow pipe 4. The sensor is connected to the control system of the ultra-high pressure pump 1. When abnormal pressure fluctuations are detected at the valve seat, the control system can timely adjust the output parameters of the ultra-high pressure pump 1 to prevent ultra-high pressure pump failures caused by abnormal operation of the one-way valve.

[0046] Furthermore, the third piston 32 is a multi-stage sleeve buffer structure. The third piston 32 includes an outer sleeve 321 and an inner sleeve 322 sleeved inside the outer sleeve 321. The bottom of the inner sleeve 322 abuts against the inner base in the inclined branch pipe 3. A connecting column 323 is provided at the middle position of the third piston 32. The connecting column 323 passes through the base and connects to the baffle 31. A locking mechanism 325 is provided at the contact surface between the outer sleeve 321 and the inner sleeve 322. The locking mechanism 325 is used to lock the outer sleeve 321 and the inner sleeve 322 when the baffle 31 is not impacted by the fluid, avoiding the sliding of the third piston 32 when manually adjusting the pressure in the vertical branch pipe cavity 50.

[0047] Further provided, the locking mechanism 325 includes a magnetic head 3251 that slides within the housing of the inner sleeve 322. The magnetic head 3251 is connected to the inner sleeve 322 by a spring 3252. A groove is provided at the position corresponding to the magnetic head 3251 on the outer sleeve 321 in the unfolded state. A partition 324 is fixed on the outer side of the connecting column 323. The outer side of the partition 324 is attached to the inner wall of the outer sleeve 321. A repulsive magnetic force is provided between the outer side of the partition 324 and the inner side of the locking mechanism 325. When the outer sleeve 321 and the inner sleeve 322 are unfolded, the partition 324 is attached to the position of the locking mechanism 325. Under the action of the repulsive magnetic force, the magnetic head 3251 slides outwards and abuts in the groove of the outer sleeve 321 to complete the locking between the outer sleeve 321 and the inner sleeve 322.

[0048] Further provided, the connecting column 323 and the outer sleeve 321 are arranged in a connection relationship that allows relative sliding within a small range. When the baffle 31 is impacted, the connecting column 323 first slides a short distance relative to the outer sleeve 321, causing the partition 324 to disengage from the locking mechanism 325 and releasing the locking of the outer sleeve 321 and the inner sleeve 322 by the magnetic head 3251.

[0049] An inner column 3211 is provided at the connection between the outer sleeve 321 and the connecting column 323. The end of the inner column 3211 slides within the connecting column 323, and a return spring is provided in the sliding cavity of the connecting column 323.

[0050] Further provided, an artificial adjustment device is provided within the vertical branch pipe 5, including a second piston 53 that slides on the inner wall of the vertical branch pipe 5. The vertical branch pipe cavity 50 is the space located between the second piston 53 and the first piston 52. Above the vertical branch pipe cavity 50, a manual lifting device 54 is connected by a lead screw. The lead screw is threadedly connected to the threaded seat on the end cover of the vertical branch pipe 5. When the manual lifting device 54 is rotated, it drives the second piston 53 to rise and fall, thereby adjusting the pressure within the vertical branch pipe cavity 50.

[0051] It should be noted that the outer side of the second piston 53 is closely attached to the inner wall of the vertical branch pipe 5 to maintain sealing.

[0052] It should be noted that the second piston 53 is rotatably connected to the end of the lead screw.

[0053] It should be noted that the manual lifting device 54 is a handle turntable, and scale markings are provided on the manual lifting device 54. Through the scale markings, the lifting height of the second piston 53 can be accurately displayed, and thus the adjustment amount of the pressure within the vertical branch pipe cavity 50 can be accurately grasped, facilitating accurate adjustment by the operator according to the actual working requirements.

[0054] Further, an angle adjusting device is also provided in the inclined branch pipe 3 for adjusting the inclination angle of the baffle 31. The angle adjusting device includes a cable 33. A driving device is provided at one end of the cable 33 outside the inclined branch pipe 3. The other end of the cable 33 passes through the outer sleeve 321 and the connecting column 323 and is connected to the baffle 31. One end of the baffle 31 is rotatably connected to the connecting column 323, and the other end is movably connected to the cable 33. When the cable 33 slides through the driving device, the inclination angle of the baffle 31 is adjusted.

[0055] It should be noted that the cable 33 starts from the driving device at the end cover of the inclined branch pipe 3 and sequentially passes through the end cover of the inclined branch pipe 3, the inclined branch pipe cavity 30, the outer sleeve 321, the inner column 3211, and the connecting column 323.

[0056] Further, the driving device is arranged on the end cover of the inclined branch pipe 3 away from the pre-buffer pipe 2 and includes an oil cylinder 34 fixed to the inclined branch pipe 3 by bolts. The end of the telescopic rod of the oil cylinder 34 is fixedly connected to the end of the cable 33. The telescopic direction of the telescopic rod of the oil cylinder 34 is parallel to the sliding direction of the cable 33. The oil cylinder 34 is used to control the inclination angle of the baffle 31.

[0057] Working principle: Before the ultra-high pressure pump 1 is started, the cable 33 controls the baffle 31 to be in an inclined state. After the ultra-high pressure pump 1 is started, the baffle 31 drives the connecting column 323 to slide down under the action of the fluid. After the plug 51 is opened, the oil cylinder 34 is controlled to drive the cable 33 to slide down, reducing the inclination angle of the baffle 31 or making the baffle 31 parallel to the fluid flow direction, thereby reducing the blocking effect of the baffle 31 on the fluid during normal operation. At this time, the control of the cable 33 by the oil cylinder 34 is small-span up and down sliding.

[0058] It should be noted that a pressure sensor is provided at the sliding connection between the inner column 3211 and the connecting column 323 to detect whether the connecting column 323 is subjected to the pulling force of the baffle 31, that is, to detect whether there is fluid passing through the pre-buffer pipe 2.

[0059] Further, a boss 331 is provided on the part of the cable 33 located inside the connecting column 323. The diameter of the connecting column 323 is larger than the diameter of the through hole through which the cable 33 passes inside the inner column 3211.

[0060] Working principle: After the ultra-high pressure pump 1 stops working, in order to improve the reset speed and accuracy of the third piston 32, the oil cylinder 34 is controlled to drive the cable 33 to slide up in a large span, and the inner column 3211 is jacked up by the boss 331, that is, the third piston 32 is quickly reset.

[0061] Further, a sliding groove 311 is provided at the connection between the baffle 31 and the cable 33. The cable 33 passes through the sliding groove 311 and a detachable limit ball is provided at the end.

[0062] It should be noted that the limiting ball is fixed at the end of the cable 33 by threads. During the sliding process of the cable 33, the limiting ball slides under the baffle 31.

[0063] It should be noted that a connecting rod is welded to the bottom of the connecting column 323, and the end of the connecting rod is rotatably connected to the baffle 31. The rotation axis of the baffle 31 and the connecting rod is perpendicular to the chute 311.

[0064] Furthermore, the oil cylinder 34 is connected with a pressure regulating system, which can automatically adjust the telescopic amount of the telescopic rod of the oil cylinder 34 according to the change of the output pressure of the ultra-high pressure pump 1, so as to accurately control the tilt angle of the baffle 31 to meet the requirements of the fluid blocking effect under different pressure conditions.

[0065] In summary, for the one-way valve used in the ultra-high pressure pump, a pre-buffer pipe 2 and a one-way flow pipe 4 are sequentially arranged on the output pipe of the ultra-high pressure pump 1. An inclined branch pipe 3 and a vertical one-way flow pipe 4 are respectively arranged on the pre-buffer pipe 2 and the one-way flow pipe 4. The high-pressure fluid output from the ultra-high pressure pump 1 first passes through the pre-buffer pipe 2. The baffle 31 is driven by the fluid impact to drive the third piston 32 to slide down, thereby reducing the pressure in the inclined branch pipe cavity 30 and the vertical branch pipe cavity 50 in advance, making it easier to push open the plug 51 when the fluid impacts below the plug 51, avoiding damage to the sealing structure in the vertical branch pipe 5 caused by high-pressure impact, and at the same time isolating the vertical branch pipe 5 from the pipeline, which is more convenient for the maintenance of the sealing components in the vertical branch pipe 5 and the adjustment of the pressure.

[0066] For the one-way valve used in the ultra-high pressure pump, the third piston 32 is set as a two-stage sleeve structure, and a locking mechanism 325 is arranged at the connection between the outer sleeve 321 and the inner sleeve 322 to lock the outer sleeve 321 and the inner sleeve 322 when the baffle 31 is not impacted by the fluid, avoiding the sliding of the third piston 32 when manually adjusting the pressure in the vertical branch pipe cavity 50. At the same time, the sliding connection of multiple sleeves significantly improves the buffering ability of the third piston 32, avoiding damage to the third piston 32 caused by excessive impact force.

[0067] For the one-way valve used in the ultra-high pressure pump, by arranging an angle adjusting device in the inclined branch pipe 3 and adjusting the tilt angle of the baffle 31 by using the cable 33, it is tilted before the ultra-high pressure pump 1 starts to work, so as to drive the third piston 32 to slide when the fluid passes for the first time. After the fluid passes, that is, when the ultra-high pressure pump 1 is working normally, the baffle 31 is controlled to be parallel to the fluid to reduce the impact force.

[0068] For the one-way valve used in the ultra-high pressure pump, by providing a boss 331 on the cable 33, after the ultra-high pressure pump 1 stops working, in order to improve the speed and accuracy of the reset of the third piston 32, the control oil cylinder 34 drives the cable 33 to slide upward in a large span, and the boss 331 is used to jack up the inner column 3211, that is, to quickly reset the third piston 32.

[0069] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-way valve for an ultra-high pressure pump, applied to an ultra-high pressure pump (1), characterized in that: The invention comprises a front buffer pipe (2) and a one-way flow pipe (4) which are sequentially arranged on the output pipe of an ultra-high pressure pump (1); a vertical branch pipe (5) is vertically arranged on the one-way flow pipe (4); a first piston (52) is slidably connected to the inner wall of the vertical branch pipe (5); a plug (51) is fixedly connected to the bottom of the first piston (52) via a connecting rod; a valve seat is arranged on the one-way flow pipe (4) at a position corresponding to the plug (51) sliding to the lowest position; a space above the first piston (52) of the vertical branch pipe (5) is a vertical branch pipe cavity (50); hydraulic oil is filled in the vertical branch pipe cavity (50); An inclined branch pipe (3) is obliquely arranged on the front buffer pipe (2); a third piston (32) is slidably connected to the inner wall of the inclined branch pipe (3); a baffle (31) is fixedly connected below the third piston (32) via a connecting rod; the baffle (31) is located in the front buffer pipe (2); a space above the third piston (32) of the inclined branch pipe (3) is an inclined branch pipe cavity (30); and the inclined branch pipe cavity (30) is in communication with the vertical branch pipe cavity (50).

2. A one-way valve for an ultra-high pressure pump according to claim 1, characterized in that: The No. 3 piston (32) is a multi-stage sleeve buffer structure. The No. 3 piston (32) comprises an outer sleeve (321) and an inner sleeve (322) sleeved on the inner side of the outer sleeve (321). The bottom of the inner sleeve (322) is pressed against the inner base of the inclined branch pipe (3). A connecting column (323) is arranged in the middle of the No. 3 piston (32). The connecting column (323) passes through the base to connect the baffle (31). A locking mechanism (325) is arranged on the contact surface of the outer sleeve (321) and the inner sleeve (322). The locking mechanism (325) is used to lock the outer sleeve (321) and the inner sleeve (322) when the baffle (31) is not impacted by the fluid, so as to prevent the No. 3 piston (322) from sliding when the pressure in the vertical branch pipe cavity (50) is manually adjusted.

3. A one-way valve for an ultra-high pressure pump according to claim 2, characterized in that: The locking mechanism (325) comprises a magnetic head (3251) sliding in the shell of the inner sleeve (322); the magnetic head (3251) and the inner sleeve (322) are connected via a spring (3252); and the outer sleeve (321) is provided with a groove corresponding to the position of the magnetic head (3251) in the unfolded state; A partition (324) is fixed on the outside of the connecting column (323), and the outside of the partition (324) is attached to the inner wall of the outer sleeve (321). Repulsive magnetic forces are set on the outside of the partition (324) and the inside of the locking mechanism (325). When the outer sleeve (321) and the inner sleeve (322) are unfolded, the partition (324) is attached to the position of the locking mechanism (325). Under the action of the repulsive magnetic forces, the magnetic suction head (3251) slides outward and presses into the groove of the outer sleeve (321) to complete the locking between the outer sleeve (321) and the inner sleeve (322).

4. A one-way valve for an ultra-high pressure pump according to claim 3, characterized in that: The connecting column (323) and the outer sleeve (321) are arranged to be connected in a relatively slidable manner within a small range, so that when the baffle (31) is impacted, the connecting column (323) first slides a short distance relative to the outer sleeve (321), so that the partition (324) is separated from the locking mechanism (325), and the contact magnetic suction head (3251) locks the outer sleeve (321) and the inner sleeve (322); An inner column (3211) is arranged at the connection between the outer sleeve (321) and the connecting column (323); the end of the inner column (3211) slides in the connecting column (323); and a return spring is arranged in the sliding cavity of the connecting column (323).

5. The one-way valve for an ultra-high pressure pump according to claim 2, characterized in that: The vertical branch pipe (5) is provided with a manual adjustment device, comprising a No. 2 piston (53) arranged on the inner wall of the vertical branch pipe (5) for sliding movement. The vertical branch pipe cavity (50) is a space located between the No. 2 piston (53) and the No. 1 piston (52). The upper part of the vertical branch pipe cavity (50) is connected to a manual lifting device (54) via a screw rod. The screw rod is threadedly connected to a threaded seat on an end cover of the vertical branch pipe (5). When the manual lifting device (54) is rotated, the No. 2 piston (53) is driven to move up and down, thereby adjusting the pressure in the vertical branch pipe cavity (50).

6. A one-way valve for an ultra-high pressure pump according to claim 4, characterized in that: An angle adjustment device is also provided in the inclined branch pipe (3) for adjusting the inclination angle of the baffle (31), the angle adjustment device comprising a cable (33), a driving device being provided at one end of the cable (33) located outside the inclined branch pipe (3), and the other end of the cable (33) passing through the outer sleeve (321) and the connecting column (323) to be connected to the baffle (31); One end of the baffle (31) is rotatably connected to the connecting column (323), and the other end is movably connected to the cable (33); when the cable (33) slides through the driving device, the inclination angle of the baffle (31) is adjusted.

7. A one-way valve for an ultra-high pressure pump according to claim 6, characterized in that: The driving device is arranged on an end cover of the inclined branch pipe (3) away from the front buffer pipe (2), and comprises an oil cylinder (34) fixed to the inclined branch pipe (3) by bolts, the end of the telescopic rod of the oil cylinder (34) is fixedly connected to the end of the cable (33), the telescopic direction of the telescopic rod of the oil cylinder (34) is parallel to the sliding direction of the cable (33), and the oil cylinder (34) is used to control the inclination angle of the baffle (31).

8. The one-way valve for an ultra-high pressure pump according to claim 6, characterized in that: The cable (33) is provided with a boss (331) at a portion located inside the connecting column (323); the diameter of the connecting column (323) is larger than the diameter of a through hole in the inner column (3211) through which the cable (33) passes.

9. The one-way valve for an ultra-high pressure pump according to claim 6, characterized in that: A sliding groove (311) is provided at the connection between the baffle (31) and the cable (33); the cable (33) passes through the sliding groove (311) and a detachable limiting ball is provided at the end thereof.

10. The one-way valve for an ultra-high pressure pump according to claim 7, characterized in that: The oil cylinder (34) is connected to a pressure regulating system, which can automatically regulate the extension and retraction amount of the telescopic rod of the oil cylinder (34) according to the change of the output pressure of the ultra-high pressure pump (1).

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