Pulse-free hydraulic reciprocating fluid material conveying pump

Abstract

The invention discloses a pulse-free hydraulic reciprocating fluid material conveying pump which comprises a pump body, a pulse adjusting assembly and a reversing valve. The pump body is connected with the two slurry cylinders, and slurry suction and discharge ports of the slurry cylinders are connected with the slurry suction and discharge valve assembly; a slurry suction port of the slurry suction and discharge valve assembly is connected with the main liquid inlet pipeline, and a slurry discharge port of the slurry suction and discharge valve assembly is connected with the main liquid discharge pipeline; a pulse adjusting assembly is arranged between the oil inlet pipe and the main liquid discharging pipeline, slurry discharging compensation is provided by arranging the pulse adjusting assembly when the oil cylinder is at a reversing point of reciprocating motion, the stability of the slurry discharging flow is guaranteed, and under the condition that a pressure reducing valve is arranged, blockage removing can be conducted on the slurry discharging pipeline by adjusting the pressure reducing valve to be normal and increasing the pressure in the slurry discharging pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, in particular to a pulse-free hydraulic reciprocating fluid material conveying pump. Background Art

[0002] Fluid material transfer pumps are commonly used mechanical devices for conveying and pressurizing fluids. They use a hydraulic oil system to control the reciprocating motion of a cylinder, achieving slurry suction and discharge. However, at the reversal point of the cylinder's reciprocating motion, the grouting pump's slurry flow rate drops sharply, causing the grouting pressure to pulse and become unstable. Summary of the Invention

[0003] The object of the present invention is to provide a pulse-free hydraulic reciprocating fluid material conveying pump to address the deficiencies of the prior art.

[0004] The technical solution of the present invention to solve the above problems is: a pulse-free hydraulic reciprocating fluid material conveying pump, comprising a pump body, a pulse adjustment component, and a reversing valve; The pump body is connected to two slurry cylinders, and the slurry suction and discharge ports of the slurry cylinders are connected to the slurry suction and discharge valve components; The slurry suction port of the slurry suction and discharge valve assembly is connected to the main liquid inlet pipeline, and the slurry discharge port of the slurry suction and discharge valve assembly is connected to the main liquid discharge pipeline; The oil inlet of the reversing valve is connected to the oil inlet pipe, the oil return port of the reversing valve is connected to the oil return pipe, and the first working oil port and the second working oil port of the reversing valve are connected to the two hydraulic oil ports of the pump body respectively; A pulse adjustment assembly is provided between the oil inlet pipe and the main discharge pipe. The pulse adjustment assembly includes a third oil cylinder connected to the preload cylinder. A cylinder piston is slidably disposed within the third oil cylinder. A preload piston is slidably disposed within the preload cylinder. The cylinder piston and the preload piston are connected by a second piston rod. A third hydraulic oil port is provided at the end of the third oil cylinder. The third hydraulic oil port is connected to the oil inlet pipe via a preload pipe.

[0005] Furthermore, the pump body includes a first oil cylinder and a second oil cylinder, and the first oil cylinder and the second oil cylinder are each connected to a slurry cylinder; Both ends of the first oil cylinder and the second oil cylinder are respectively provided with a first hydraulic oil port and a second hydraulic oil port, and the second hydraulic oil ports of the first oil cylinder and the second oil cylinder are connected through a pipeline; The first working oil port of the reversing valve is connected to the first hydraulic oil port of the first oil cylinder, and the second working oil port of the reversing valve is connected to the first hydraulic oil port of the second oil cylinder.

[0006] Furthermore, the pump body includes a bidirectional oil cylinder, and two slurry cylinders are respectively connected to the two ends of the bidirectional oil cylinder; The two ends of the bidirectional oil cylinder are respectively provided with a first liquid drive oil port and a second liquid drive oil port, and the first working oil port and the second working oil port of the reversing valve are respectively connected to the first liquid drive oil port and the second liquid drive oil port.

[0007] Furthermore, the slurry suction and discharge valve assembly includes a slurry suction pipe and a slurry discharge pipe, which are connected in parallel to the slurry suction and discharge ports of the slurry cylinder. The outer end of the slurry suction pipe is connected to the main liquid inlet pipe, and the outer end of the slurry discharge pipe is connected to the main liquid discharge pipe. The slurry suction pipe and the slurry discharge pipe are respectively provided with a one-way valve.

[0008] Furthermore, the cross-sectional area of ​​the pre-compression piston is larger than the cross-sectional area of ​​the piston in the slurry cylinder, and the pressure in the pre-compression cylinder is smaller than the pressure in the slurry cylinder.

[0009] Furthermore, the cross-sectional area of ​​the pre-compression piston is equal to the cross-sectional area of ​​the piston in the slurry cylinder, a pressure reducing valve is provided on the pre-compression pipeline, and the pressure in the pre-compression cylinder is lower than the pressure in the slurry cylinder.

[0010] Furthermore, the cross-sectional area of ​​the pre-compression piston is smaller than the cross-sectional area of ​​the piston in the slurry cylinder, a pressure reducing valve is provided on the pre-compression pipeline, and the pressure in the pre-compression cylinder is smaller than the pressure in the slurry cylinder.

[0011] Furthermore, when the pre-compression cylinder provides slurry discharge compensation, the pressure reducing valve is adjusted to normal, the thrust of the third oil cylinder is increased, the pressure in the main drainage pipeline is increased, and the main drainage pipeline is unblocked.

[0012] The present invention has the beneficial effects: The present invention provides a pulse-free hydraulic reciprocating fluid material conveying pump, which provides slurry discharge compensation when the oil cylinder is at the reversing point of the reciprocating motion by setting a pulse adjustment component, thereby ensuring a stable slurry discharge flow rate. When a pressure reducing valve is set, the pressure reducing valve can be adjusted to normal to increase the pressure in the slurry discharge pipeline, thereby unblocking the slurry discharge pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the pulse regulation component in Example 1 without a pressure reducing valve; Figure 2 This is a schematic diagram of the structure of the pulse regulation component in Example 1 when a pressure reducing valve is provided; Figure 3 This is a schematic diagram of the structure of the pulse regulation component in Example 2 without a pressure reducing valve; Figure 4 This is a schematic diagram of the structure of the pulse regulation component in Example 2 when a pressure reducing valve is provided; In the figure: 1-first oil cylinder, 2-second oil cylinder, 3-slurry cylinder, 4-reversing valve, 6-first piston rod, 7-slurry suction pipe, 8-slurry discharge pipe, 9-main liquid inlet pipe, 10-main liquid discharge pipe, 11-first hydraulic oil port, 12-second hydraulic oil port, 13-oil inlet pipe, 14-oil return pipe, 15-third oil cylinder, 16-pre-compression cylinder, 18-second piston rod, 19-third hydraulic oil port, 20-pre-compression pipe, 21-pressure reducing valve, 22-bidirectional oil cylinder, 23-first liquid drive oil port, 24-second liquid drive oil port. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances. Example 1

[0015] like Figure 1 and 2 As shown, a pulse-free hydraulic reciprocating fluid material conveying pump includes a pump body, a pulse adjustment component, and a reversing valve 4.

[0016] The pump body includes a first oil cylinder 1 and a second oil cylinder 2, and the first oil cylinder 1 and the second oil cylinder 2 have the same structure. The first oil cylinder 1 is connected to a slurry cylinder 3, and the outer end of the slurry cylinder 3 is connected to the slurry suction and discharge valve assembly. A cylinder piston is slidably provided in the first oil cylinder 1, and a slurry piston is slidably provided in the slurry cylinder 3. The cylinder piston and the slurry piston are connected by a first piston rod 6; the slurry suction and discharge valve assembly includes a slurry suction pipe 7 and a slurry discharge pipe 8. The slurry suction pipe 7 and the slurry discharge pipe 8 are connected in parallel to the slurry suction and discharge ports of the slurry cylinder 3. The outer end of the slurry suction pipe 7 is connected to the main liquid inlet pipe 9, and the outer end of the slurry discharge pipe 8 is connected to the main liquid discharge pipe 10. The slurry suction pipe 7 and the slurry discharge pipe 8 are respectively provided with a one-way valve.

[0017] Both ends of the first oil cylinder 1 and the second oil cylinder 2 are respectively provided with a first hydraulic oil port 11 and a second hydraulic oil port 12. The reversing valve 4 includes a first working oil port A, a second working oil port B, an oil inlet P, and an oil return port T. The first hydraulic oil port 11 of the first oil cylinder 1 is connected to the first working oil port A of the reversing valve 4, the first hydraulic oil port 11 of the second oil cylinder 2 is connected to the second working oil port B of the reversing valve 4, the second hydraulic oil ports 12 of the first oil cylinder 1 and the second oil cylinder 2 are connected through a pipeline, the oil inlet P of the reversing valve 4 is connected to the oil inlet pipe 13, and the oil return port T of the reversing valve 4 is connected to the oil return pipe 14.

[0018] A pulse adjustment assembly is provided between the oil inlet pipe 13 and the main liquid discharge pipe 10. The pulse adjustment assembly includes a third oil cylinder 15, which is connected to a preload cylinder 16. A cylinder piston is slidably disposed within the third oil cylinder 15, and a preload piston is slidably disposed within the preload cylinder 16. The cylinder piston and the preload piston are connected by a second piston rod 18. A third hydraulic oil port 19 is provided at the end of the third oil cylinder 15, and the third hydraulic oil port 19 is connected to the oil inlet pipe 13 via a preload pipe 20.

[0019] In one embodiment, Figure 1 As shown, the cross-sectional area of ​​the pre-stressing piston is larger than the cross-sectional area of ​​the slurry piston. In the figure, the second oil cylinder 2 is discharging slurry. Because F=P·S, the slurry discharge backwash pressure F in the pre-stressing cylinder 16 and the slurry cylinder 3 connected to the second oil cylinder 2 is the same, but because the cross-sectional area S of the pre-stressing piston is larger than the cross-sectional area S of the slurry piston, the pressure P in the pre-stressing cylinder 16 is smaller than the pressure in the slurry cylinder 3. The pressure of the third oil cylinder 15 and the second oil cylinder 2 is the same, so the pre-stressing piston moves inward, and the slurry is sucked in the pre-stressing cylinder 16. When the second oil cylinder 2 reaches the reversing point, it stays for a while to ensure that the one-way valve of the slurry suction and discharge valve assembly connected to it is closed before reversing. At this time, the first oil cylinder 1 is also at the reversing point. At this time, the slurry discharge volume drops sharply, and the inward pushing pressure in the pre-stressing cylinder 16 disappears. The third oil cylinder 15 pushes outward with force to push out the liquid in the pre-stressing cylinder 16, providing slurry discharge compensation and ensuring stable slurry discharge flow.

[0020] For example: the effective areas of the oil cylinder 1 and the pre-compression oil cylinder 15 are both 0.0153 square meters, the cross-sectional area of ​​the pre-compression piston is 0.053 square meters, the cross-sectional area of ​​the slurry piston is 0.041 square meters, the oil pressure in the oil inlet pipe 13 is 10 MPa, the pressure in the slurry cylinder 3 is 3.65 MPa, and the pressure in the pre-compression cylinder 16 is 2.89 MPa. During the slurry discharge process, the slurry cylinder 3 will push the slurry cylinder piston in the pre-compression slurry cylinder backward due to the high pressure, thereby realizing the pre-compression function. When the reversing point is reached, the load in the pipeline suddenly decreases, the pressure in the pre-compression slurry cylinder is released, and the slurry in the pre-compression slurry cylinder will be discharged, ensuring a stable slurry discharge flow rate.

[0021] In another embodiment, Figure 2As shown, the cross-sectional area of ​​the pre-stressing piston is less than or equal to the cross-sectional area of ​​the slurry piston, and a pressure reducing valve 21 is provided on the pre-stressing pipe 20. In the figure, the second oil cylinder 2 is discharging slurry. Because F=P·S, the slurry discharge backwash pressure F in the pre-stressing cylinder 16 and the slurry cylinder 3 connected to the second oil cylinder 2 is the same, but because the cross-sectional area S of the pre-stressing piston is less than or equal to the cross-sectional area S of the slurry piston, the pressure P in the pre-stressing cylinder 16 is greater than or equal to the pressure in the slurry cylinder 3. The third oil cylinder 15 is decompressed by the pressure reducing valve 21, so that the pre-stressing piston moves inward, and the slurry is sucked in the pre-stressing cylinder 16. When the second oil cylinder 2 reaches the reversing point, it stays for a while to ensure that the one-way valve of the slurry suction and discharge valve assembly connected to it is closed before the reversing action is performed. At this time, the first oil cylinder 1 is also at the reversing point. At this time, the slurry discharge volume drops sharply, the inward pushing pressure in the pre-stressing cylinder 16 disappears, and the third oil cylinder 15 is pushed outward with force to push out the liquid in the pre-stressing cylinder 16 to provide slurry discharge compensation. When the cross-sectional area of ​​the pre-stressing piston is smaller than that of the slurry piston, and the pre-stressing cylinder 16 provides slurry discharge compensation, the pressure reducing valve 21 is adjusted to normal, the thrust of the third oil cylinder 15 is increased, and the pressure in the total drainage pipe 10 is increased, so that the total drainage pipe 10 can be unblocked.

[0022] For example: the effective areas of the oil cylinder 1 and the pre-pressing oil cylinder 15 are both 0.0153 square meters, the cross-sectional area of ​​the pre-pressing piston is 0.031 square meters, the cross-sectional area of ​​the slurry piston is 0.041 square meters, the oil pressure in the oil inlet pipe 13 is 10 MPa, the pressure in the slurry cylinder 3 is 3.65 MPa, and after the pressure in the pre-pressing oil cylinder is reduced to 5 MPa through the pressure reducing valve 21, the pressure in the pre-pressing cylinder 16 is 2.42 MPa. During the slurry discharge process, the slurry cylinder 3 pushes the slurry cylinder piston in the pre-pressing slurry cylinder backward due to the high pressure, realizing the pre-pressing function. When the reversing point is reached, the load in the pipeline suddenly decreases, the pressure in the pre-pressing slurry cylinder is released, and the slurry in the pre-pressing slurry cylinder is discharged to ensure a stable slurry discharge flow rate. When the pipeline is blocked, the pressure reducing valve 21 is adjusted to restore the pressure in the pre-pressing oil cylinder to 10 MPa. After that, the pressure in the pre-pressing cylinder 16 is 4.9 MPa, which is higher than the pressure in the pipeline and can be used for plugging.

[0023] In one embodiment, the slurry suction and discharge valve assembly may adopt the same structure as the slurry suction and discharge valve assembly in patent CN202022548295.X, or adopt other existing structures that can realize the functions of the above-mentioned slurry suction and discharge valve assembly. Example 2

[0024] like Figure 3 and Figure 4 As shown, a pulse-free hydraulic reciprocating fluid material conveying pump includes a pump body, a pulse adjustment component, and a reversing valve 4.

[0025] The pump body includes a bidirectional oil cylinder 22 and two slurry cylinders 3. The two slurry cylinders 3 are respectively connected to the two ends of the bidirectional oil cylinder 22. A cylinder piston is slidably provided in the bidirectional oil cylinder 22, and a slurry piston is slidably provided in the slurry cylinder 3. The two ends of the cylinder piston are respectively connected to the slurry pistons at both ends through a first piston rod 6. The outer end of the slurry cylinder 3 is connected to the slurry suction and discharge valve assembly, which includes a slurry suction pipe 7 and a slurry discharge pipe 8. The slurry suction pipe 7 and the slurry discharge pipe 8 are connected in parallel to the slurry suction and discharge ports of the slurry cylinder 3. The outer end of the slurry suction pipe 7 is connected to the main liquid inlet pipe 9, and the outer end of the slurry discharge pipe 8 is connected to the main liquid discharge pipe 10. The slurry suction pipe 7 and the slurry discharge pipe 8 are respectively provided with a one-way valve; The two ends of the bidirectional oil cylinder 22 are respectively provided with a first liquid drive oil port 23 and a second liquid drive oil port 24. The reversing valve 4 includes a first working oil port A, a second working oil port B, an oil inlet P, and an oil return port T. The first liquid drive oil port 23 is connected to the first working oil port A of the reversing valve 4, the second liquid drive oil port 24 is connected to the second working oil port B of the reversing valve 4, the oil inlet P of the reversing valve 4 is connected to the oil inlet pipe 13, and the oil return port T of the reversing valve 4 is connected to the oil return pipe 14; A pulse adjustment assembly is provided between the oil inlet pipe 13 and the main liquid discharge pipe 10. The pulse adjustment assembly includes a third oil cylinder 15, which is connected to a preload cylinder 16. A cylinder piston is slidably disposed within the third oil cylinder 15, and a preload piston is slidably disposed within the preload cylinder 16. The cylinder piston and the preload piston are connected by a second piston rod 18. Third hydraulic oil ports 19 are provided at each end of the third oil cylinder 15, and the third hydraulic oil ports 19 are connected to the oil inlet pipe 13 via a preload pipe 20.

[0026] In one embodiment, Figure 3 As shown, the cross-sectional area of ​​the pre-compression piston is larger than the cross-sectional area of ​​the slurry piston.

[0027] In another embodiment, Figure 4 As shown, the cross-sectional area of ​​the pre-pressing piston is smaller than or equal to the cross-sectional area of ​​the slurry piston, and a pressure reducing valve 21 is provided on the pre-pressing pipeline 20 .

[0028] In one embodiment, the slurry suction and discharge valve assembly may adopt the same structure as the slurry suction and discharge valve assembly in patent CN202022548295.X, or adopt other existing structures that can realize the functions of the above-mentioned slurry suction and discharge valve assembly.

[0029] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A pulse-free hydraulic reciprocating fluid material delivery pump, characterized in that: It includes a pump body, a pulse adjustment component, and a reversing valve (4); The pump body is connected to two slurry cylinders (3), and the slurry suction and discharge ports of the slurry cylinders (3) are connected to the slurry suction and discharge valve assembly; The slurry suction port of the slurry suction and discharge valve assembly is connected to the main liquid inlet pipe (9), and the slurry discharge port of the slurry suction and discharge valve assembly is connected to the main liquid discharge pipe (10); The oil inlet of the reversing valve (4) is connected to the oil inlet pipe (13), the oil return port of the reversing valve (4) is connected to the oil return pipe (14), and the first working oil port and the second working oil port of the reversing valve (4) are respectively connected to the two hydraulic oil ports of the pump body; A pulse regulating assembly is provided between the oil inlet pipe (13) and the main liquid discharge pipe (10), and the pulse regulating assembly includes a third oil cylinder (15), the third oil cylinder (15) is connected to the pre-pressing cylinder (16), an oil cylinder piston is provided in a sliding manner in the third oil cylinder (15), a pre-pressing piston is provided in a sliding manner in the pre-pressing cylinder (16), and the oil cylinder piston and the pre-pressing piston are connected via a second piston rod (18); a third hydraulic oil port (19) is provided at the end of the third oil cylinder (15), and the third hydraulic oil port (19) is connected to the oil inlet pipe (13) via a pre-pressing pipe (20).

2. A pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The pump body comprises a first oil cylinder (1) and a second oil cylinder (2), and the first oil cylinder (1) and the second oil cylinder (2) are each connected to a slurry cylinder (3); Both ends of the first oil cylinder (1) and the second oil cylinder (2) are respectively provided with a first hydraulic oil port (11) and a second hydraulic oil port (12), and the second hydraulic oil ports (12) of the first oil cylinder (1) and the second oil cylinder (2) are connected through a pipeline; The first working oil port of the reversing valve (4) is connected to the first hydraulic oil port (11) of the first oil cylinder (1), and the second working oil port of the reversing valve (4) is connected to the first hydraulic oil port (11) of the second oil cylinder (2).

3. A pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The pump body comprises a bidirectional oil cylinder (22), and two slurry cylinders (3) are respectively connected to the two ends of the bidirectional oil cylinder (22); The two ends of the bidirectional oil cylinder (22) are respectively provided with a first liquid drive oil port (23) and a second liquid drive oil port (24); the first working oil port and the second working oil port of the reversing valve (4) are respectively connected to the first liquid drive oil port (23) and the second liquid drive oil port (24).

4. A pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The slurry suction and discharge valve assembly comprises a slurry suction pipe (7) and a slurry discharge pipe (8). The slurry suction pipe (7) and the slurry discharge pipe (8) are connected in parallel to the slurry suction and discharge ports of the slurry cylinder (3). The outer end of the slurry suction pipe (7) is connected to the main liquid inlet pipe (9), and the outer end of the slurry discharge pipe (8) is connected to the main liquid discharge pipe (10). The slurry suction pipe (7) and the slurry discharge pipe (8) are respectively provided with a one-way valve.

5. The pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The cross-sectional area of ​​the pre-compression piston is larger than the cross-sectional area of ​​the piston in the slurry cylinder (3), and the pressure in the pre-compression cylinder (16) is smaller than the pressure in the slurry cylinder (3).

6. The pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The cross-sectional area of ​​the pre-compression piston is equal to the cross-sectional area of ​​the piston in the slurry cylinder (3); a pressure reducing valve (21) is provided on the pre-compression pipe (20); and the pressure in the pre-compression cylinder (16) is lower than the pressure in the slurry cylinder (3).

7. The pulse-free hydraulic reciprocating fluid material delivery pump according to claim 1, characterized in that: The cross-sectional area of ​​the pre-compression piston is smaller than the cross-sectional area of ​​the piston in the slurry cylinder (3); a pressure reducing valve (21) is provided on the pre-compression pipeline (20); and the pressure in the pre-compression cylinder (16) is smaller than the pressure in the slurry cylinder (3).

8. A pulse-free hydraulic reciprocating fluid material delivery pump according to claim 7, characterized in that: When the pre-compression cylinder (16) provides slurry discharge compensation, the pressure reducing valve (21) is adjusted to normal, the thrust of the third oil cylinder (15) is increased, the pressure in the main drainage pipe (10) is increased, and the main drainage pipe (10) is unblocked.

Images