Bidirectional energy accumulator

Abstract

The bidirectional energy accumulator comprises a cylinder body, two cavities are formed in the cylinder body and include the lower end cavity and the upper end cavity, the diameter of the lower end cavity is larger than that of the upper end cavity, and pistons are arranged in the lower end cavity and the upper end cavity and include the lower piston and the upper piston; a slurry channel and a gas channel are arranged between the end chamber and the upper end chamber, one end of the gas channel is provided with a gas inlet valve, and two ends of the gas channel are respectively communicated with the rear end of the lower end chamber and the front end of the upper end chamber through inclined hole channels; one end of the slurry channel is communicated with the front end of the lower-end chamber through a connecting pipe, and a liquid inlet pipe opening is formed in the front end of the lower-end chamber; the other end of the slurry channel is communicated with the rear end of the upper-end chamber through a three-way pipe, and the other end of the three-way pipe is communicated with an external slurry conveying pipeline, so that slurry enters the lower-end chamber and the upper-end chamber in sequence, and pressure and flow compensation for the pipeline is realized twice; the diameters of the two cylinders are different, so that when the energy accumulator responds, it can be guaranteed that the large-diameter piston is closed at the front dead center firstly, connection between a pipeline and the front end slurry suction and discharge valve and connection between the pipeline and the pump body are cut off, and therefore front end components can be effectively protected against damage when the water hammer effect occurs.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting pipelines, and particularly to a two-way accumulator applied to grouting pipelines. Background Art

[0002] An accumulator is a device used to store and release energy, which can provide a certain amount of pressure medium in a short time to meet the requirements of the system for speed and pressure. It can achieve functions such as pressure holding, buffering, reducing hydraulic shock, and reducing the driving power of the system, and is most commonly used as a hydraulic accessory in hydraulic systems. At present, most of the accumulators applied in the slurry pipelines of grouting equipment are only slightly modified from those in hydraulic systems, with low adaptability, poor effects, and short service life.

[0003] In the practical application of hydraulic systems, bladder accumulators and piston accumulators are the two most commonly used types. A bladder accumulator stores energy by compressing the gas in the bladder, with the liquid and gas separated by the bladder. It has a fast response speed and is suitable for high-frequency shock and pulsation absorption. However, the bladder is prone to aging, especially when applied to slurry pipelines with particles, and is easily damaged and needs to be frequently replaced. A piston accumulator uses a piston to separate the gas and liquid, and stores energy by compressing the gas through the movement of the piston. It adopts a single-cylinder and single-piston structure, and the slurry enters and exits through one inlet and outlet. It has a simple structure and is easy to maintain, and is suitable for large-capacity and high-pressure occasions. However, the piston has a slow response speed and limited shock absorption effect, and the energy absorption capacity of the piston accumulator is limited by the stroke of the piston and the volume of the gas chamber. For large-energy and high-intensity water hammer shocks, the piston accumulator cannot completely absorb them. If multiple accumulators are connected in series to increase the volume, the connection between various pipelines is also relatively complex. Therefore, traditional piston accumulators are not suitable for high-frequency slurry conveying pipelines. Summary of the Invention

[0004] In view of the above problems, the present invention discloses a two-way accumulator specifically applied to slurry pipelines, which can relieve pump head pulsation, weaken water hammer shock, and protect the front and rear end equipment.

[0005] The specific technical solutions are as follows:

[0006] Two-way accumulator, including a cylinder body, wherein two chambers are provided in the cylinder body, namely a lower chamber and an upper chamber, and the diameter of the lower chamber is larger than that of the upper chamber. Pistons are provided in both the lower chamber and the upper chamber, namely a lower piston and an upper piston respectively; a slurry channel and a gas channel are provided between the lower chamber and the upper chamber. An air inlet valve is provided at one end of the gas channel. Both ends of the gas channel are respectively communicated with the rear end of the lower chamber and the front end of the upper chamber through inclined holes; one end of the slurry channel is communicated with the front end of the lower chamber through a connecting pipe, and a liquid inlet pipe orifice is further provided at the front end of the lower chamber; the other end of the slurry channel is communicated with the rear end of the upper chamber through a three-way pipe, and the other end of the three-way pipe is communicated with an external slurry conveying pipeline, so that the slurry compresses the pistons and sequentially enters the lower chamber and the upper chamber for storage and energy release, so as to realize double pressure and flow compensation for the pipeline.

[0007] Before work, high-pressure gas is filled into the gas channel. The high-pressure gas is respectively conveyed to the rear end of the lower chamber and the front end of the upper chamber through the gas channel and the two air inlet channels, and respectively pushes the lower piston forward and the upper piston backward to the end of the chamber.

[0008] When feeding slurry, the slurry enters the lower chamber through the liquid inlet pipe orifice and pushes the lower piston backward to compress the gas in the gas chamber to store energy. After the lower piston returns to its original position, it pushes the slurry to flow into the slurry channel through the connecting pipe and enters the upper chamber through the three-way pipe. Thus, while the slurry pushes the upper piston forward, it flows out of the accumulator backward. After the upper piston returns to its original position, the two chambers realize double compensation for the pressure and flow of the slurry pipeline, release energy, and further realize the effects of pressure maintaining, buffering and impact reduction.

[0009] Further, the ends of the lower chamber and the upper chamber away from each other are open and are respectively provided with a lower flange and an upper flange. The liquid inlet pipe orifice is opened on the lower flange, and buffer holes are opened on both the lower flange and the upper flange. The buffer hole on the lower flange is connected to one end of the connecting pipe, and the buffer hole on the upper flange is connected to one end of the three-way pipe.

[0010] Further, the buffer holes are all in a tapered surface structure with a narrow outer part and a wide inner part. Pipeline flanges are respectively installed on the outer walls of the upper flange and the lower flange. Mounting holes corresponding to the positions of the buffer holes are opened on the pipeline flanges. Joint pipes are embedded in the mounting holes, and a buffer gap is left between the inner wall of the mounting hole and the outer wall of the joint pipe. One end of the joint pipe is connected to the connecting pipe or the three-way pipe. A retaining ring is provided on the outer wall of the joint pipe, and the retaining ring is in sealing fit with the outer wall of the pipeline flange.

[0011] Further, a buffer groove with a circular structure is formed on the end face of the piston close to the slurry, and a weight-reducing groove is formed on the end face of the piston far from the slurry. L-shaped slip ring type combined sealing rings are arranged at both the front and rear ends on the side wall of the piston.

[0012] Further, one end of the gas passage far from the intake valve is closed and a pressure gauge is installed.

[0013] Further, air grooves are formed at one end of the upper chamber far from the tee pipe and one end of the lower chamber far from the liquid inlet pipe. The side walls of the two air grooves are respectively communicated with the gas passage through the inclined holes, so that the chambers are separated into gas-liquid two phases with the piston as the boundary. The inclined holes are respectively perpendicular to the gas passage and are inclined.

[0014] Further, both the slurry passage and the gas passage are horizontally arranged and are distributed left and right.

[0015] Further, the upper chamber, the lower chamber, the slurry passage, and the gas passage are arranged in parallel with each other.

[0016] Further, the intake valve is a high-pressure stop valve.

[0017] The beneficial effects of the present invention are embodied in:

[0018] 1. The accumulator of the present invention adopts a double-cylinder chamber structure with different cylinder diameters. The cylinder diameter on the slurry inlet side is larger, so the air pressure in the large chamber is greater than that in the small chamber. When the accumulator responds, it can ensure that the large-diameter piston closes at the front dead center first, cutting off the connection between the pipeline and the front suction and discharge slurry valves and the pump body, so that the front components can be effectively protected from damage during the water hammer effect, and the service life of the grouting equipment is improved;

[0019] 2. The two chambers arranged oppositely in the present invention can compensate the pipeline pressure and flow twice, improving the efficiency of the accumulator and at the same time improving the disadvantage of slightly poor time response of the piston-type accumulator;

[0020] 3. The present invention optimizes the piston size, piston ring selection and arrangement, making the accumulator more suitable for the working conditions with slurry as the working medium, while retaining the advantages of gas-slurry separation, reliable work and long life of the piston-type accumulator;

[0021] 4. By adding a gas passage and a slurry passage, the horizontal arrangement of the upper and lower cylinders is realized, significantly shortening the axial dimension and being more convenient for installation and adapting to different working scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2Schematic diagram of the internal structure of the present invention.

[0024] Figure 3 Schematic diagram of the front-end structure of the present invention.

[0025] Figure 4 Schematic diagram of the rear-end structure of the present invention.

[0026] Figure 5 Side sectional view of the present invention.

[0027] Figure 6 Frontal sectional view of the present invention.

[0028] Figure 7 Stereogram of the cylinder block of the present invention.

[0029] Figure 8 Side sectional view of the cylinder block of the present invention.

[0030] Figure 9 For Figure 5 Enlarged schematic diagram at position A in

[0031] Figure 10 Schematic diagram of the structure of the lower flange in the present invention.

[0032] Figure 11 For Figure 10 Cross-sectional view taken along the A-A direction in

[0033] Explanation of reference numerals: cylinder block 1, lower end chamber 2, lower piston 21, buffer groove 211, weight-reducing groove 212, L-shaped sliding ring type combined sealing ring 213, air groove 22, upper end chamber 3, upper piston 31, slurry passage 4, gas passage 5, inclined hole passage 51, intake valve 52, pressure gauge 53, connecting pipe 6, tee pipe 7, lower flange 8, liquid inlet pipe orifice 81, buffer hole 82, upper flange 9, pipe flange 10, mounting hole 101, buffer gap 102, joint pipe 11, retaining ring 111. Detailed implementation manners

[0034] To make the technical solution of the present invention clearer and more definite, the present invention will be further described below with reference to the accompanying drawings. Any solution obtained by equivalent replacement of the technical features of the technical solution of the present invention and through conventional reasoning falls within the protection scope of the present invention. The fixed connection and fixed setting mentioned in the present invention are all common connection methods in the mechanical field, and welding, bolt and nut connection, and screw connection are all applicable.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "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. It 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 therefore should not be construed as a limitation on the present invention.

[0036] Please refer to the attached Figure 1-11 , this embodiment provides a two-way accumulator, which is specifically applied to the slurry pipeline, can relieve the pump head pulsation, weaken the water hammer impact, and protect the front and rear end equipment. The accumulator includes a cylinder body 1, and two chambers are arranged in the cylinder body 1, namely a lower chamber 2 and an upper chamber 3. The diameter of the lower chamber 2 is larger than that of the upper chamber 3. Pistons are arranged in both the lower chamber 2 and the upper chamber 3, namely a lower piston 21 and an upper piston 31 respectively, and the directions between the lower piston 21 and the upper piston 31 are opposite. A slurry channel 4 and a gas channel 5 are arranged between the lower chamber 2 and the upper chamber 3. One end of the gas channel 5 is provided with an intake valve 52, and the intake valve 52 is a high-pressure cut-off valve. The other end is closed and installed with a pressure gauge 53. Both ends of the gas channel 5 are respectively connected to the rear end of the lower chamber 2 and the front end of the upper chamber 3 through inclined orifices 51; one end of the slurry channel 4 is connected to the front end of the lower chamber 2 through a connecting pipe 6, and a liquid inlet pipe orifice 81 is also provided at the front end of the lower chamber 2. The slurry enters the lower chamber 2 from the liquid inlet pipe orifice 81, so that the lower piston 21 is pushed to open another outlet on the end cover, so that the slurry can enter the connecting pipe 6 and flow into the slurry channel 4 inside the cylinder body 1. This channel penetrates the cylinder body 1 and guides the slurry to flow to the other side of the cylinder body 1; the other end of the slurry channel 4 is connected to the rear end of the upper chamber 3 through a three-way pipe 7, and the other end of the three-way pipe 7 is connected to the external slurry conveying pipeline, so that the slurry compresses the piston and sequentially enters the lower chamber 2 and the upper chamber 3 for energy storage and release, so as to realize the double pressure and flow compensation of the pipeline.

[0037] Before work, it is necessary to use an inflation device to fill the accumulator gas channel 5 with high-pressure nitrogen of 3-5 MPa through the intake valve 52. The high-pressure gas is respectively transported to the rear end of the lower chamber 2 and the front end of the upper chamber 3 through the gas channel 5 and the two intake channels, and respectively pushes the lower piston 21 forward and the upper piston 31 backward to the end of the chamber, and closes the two ends of the pipe orifice.

[0038] During slurry feeding, under the rated working condition, the slurry flows through the accumulator and enters the lower chamber 2 through the liquid inlet pipe orifice 81, then pushes the lower piston 21 backward and compresses the gas in the gas chamber to store energy. When the pump head plunger reverses or the grouting is about to end, resulting in a water hammer impact, the external pipeline pressure drops suddenly. At this time, after the lower piston 21 resets, it pushes the slurry to flow through the connecting pipe 6 into the slurry passage 4 and enters the upper chamber 3 through the three-way pipe 7. Thus, while the slurry pushes the upper piston 31 forward, it flows out of the accumulator backward. Subsequently, after the upper piston 31 resets, the upper and lower chambers achieve two compensations for the pressure and flow rate of the slurry pipeline, release energy, and further achieve the effects of pressure maintenance, buffering, and impact reduction. By using cavities and pistons with different diameters, the slurry inlet side is closed first to achieve the effect of protecting the front-end equipment.

[0039] In this embodiment, the ends of the lower chamber 2 and the upper chamber 3 that are far away from each other are open and are respectively equipped with a lower flange 8 and an upper flange 9. The liquid inlet pipe orifice 81 is opened on the lower flange 8, and buffer holes 82 are opened on both the lower flange 8 and the upper flange 9. One end of the connecting pipe 6 is connected to the buffer hole 82 on the lower flange 8, and the connecting pipe 6 is of a U-shaped pipe structure; one end of the three-way pipe 7 is connected to the buffer hole 82 on the upper flange 9, and the directions of the other two ends of the three-way pipe 7 are on the same straight line.

[0040] The buffer holes 82 are all of a tapered inclined surface structure that is narrow on the outside and wide on the inside, so that when the piston resets, the slurry can form a buffer when it is pushed through the buffer holes 82. Pipe flanges 10 are respectively installed on the outer walls of the upper flange 9 and the lower flange 8, and mounting holes 101 corresponding to the positions of the buffer holes 82 are opened on the pipe flanges 10. Among them, the mounting holes 101 on the lower pipe flange 10 and the liquid inlet pipe orifice 81 are distributed left and right, and a round hole corresponding to the liquid inlet pipe orifice 81 is also opened on the pipe flange 10 on the lower flange 8; a joint pipe 11 is respectively embedded in the two mounting holes 101. One end of the joint pipe 11 is connected to the connecting pipe 6 or the three-way pipe 7. A retaining ring 111 is provided on the outer wall of the joint pipe 11, and the retaining ring 111 fits and seals with the outer wall of the pipe flange 10. A buffer gap 102 is left between the inner wall of the mounting hole 101 and the outer wall of the joint pipe 11. The slurry pushed by the piston rushes into the buffer gap and then flows back to form a buffer.

[0041] In this embodiment, a buffer groove 211 with a circular structure is opened on the end face of the piston close to the slurry. The buffer groove 211 cooperates with the buffer holes 82 and the buffer gap 102 for buffering, making the flow more difficult and increasing the resistance. Weight-reducing grooves 212 are opened on the end faces of the piston far away from the slurry. L-shaped slip ring type combined sealing rings 213 are provided at both the front and rear ends on the side wall of the piston to prevent the slurry from entering the gas chamber, with good sealing effect and better adaptation to the slurry working conditions.

[0042] In this embodiment, air grooves 22 are provided at both ends of the upper chamber 3 away from the tee 7 and both ends of the lower chamber 2 away from the liquid inlet 81, so that both ends of the gas passage 5 are respectively connected to the air grooves 22 of the two chambers through two inclined channels 51. The inclined channels 51 are perpendicular to the gas passage 5 respectively, forming a gas-liquid two-phase separation with the piston as the boundary. The slurry passage 4 and the gas passage 5 are both arranged horizontally and distributed left and right. The upper chamber 3, the lower chamber 2, the slurry passage 4, and the gas passage 5 are arranged parallel to each other, realizing a horizontal arrangement of the double-cylinder chambers, shortening the axial dimension, and being more convenient for installation and adapting to different working scenarios.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. Bidirectional accumulator, characterized in that: The invention comprises a cylinder body (1), wherein two chambers are arranged in the cylinder body (1), namely a lower chamber (2) and an upper chamber (3), and the diameter of the lower chamber (2) is larger than that of the upper chamber (3). The lower chamber (2) and the upper chamber (3) are both provided with pistons, namely a lower piston (21) and an upper piston (31). A slurry channel (4) and a gas channel (5) are arranged between the lower chamber (2) and the upper chamber (3), and one end of the gas channel (5) is provided with an intake valve (52). The two ends of the gas channel (5) are connected to the intake valve (52) through inclined holes (51). The rear end of the lower chamber (2) is connected to the front end of the upper chamber (3); one end of the slurry channel (4) is connected to the front end of the lower chamber (2) through a connecting pipe (6), and the front end of the lower chamber (2) is also provided with a liquid inlet (81); the other end of the slurry channel (4) is connected to the rear end of the upper chamber (3) through a three-way pipe (7), and the other end of the three-way pipe (7) is connected to an external slurry delivery pipeline, so that the slurry compresses the piston and enters the lower chamber (2) and the upper chamber (3) in sequence to store and release energy, so as to achieve double pressure and flow compensation of the pipeline.

2. The bidirectional accumulator according to claim 1, characterized in that: The ends of the lower chamber (2) and the upper chamber (3) which are far away from each other are open and respectively provided with a lower flange (8) and an upper flange (9); the lower flange (8) is provided with the liquid inlet (81), and both the lower flange (8) and the upper flange (9) are provided with buffer holes (82); the buffer hole (82) on the lower flange (8) is connected to one end of the connecting pipe (6), and the buffer hole (82) on the upper flange (9) is connected to one end of the three-way pipe (7).

3. The bidirectional accumulator according to claim 2, characterized in that: The buffer holes (82) are all conical structures with a narrow outer surface and a wide inner surface. Pipe flanges (10) are respectively installed on the outer walls of the upper end flange (9) and the lower end flange (8). The pipe flanges (10) are each provided with mounting holes (101) corresponding to the positions of the buffer holes (82). A joint pipe (11) is embedded in the mounting holes (101), and a circle of buffer gap (102) is left between the inner wall of the mounting hole (101) and the outer wall of the joint pipe (11). One end of the joint pipe (11) is connected to the connecting pipe (6) or the three-way pipe (7). A retaining ring (111) is provided on the outer wall of the joint pipe (11), and the retaining ring (111) is sealed against the outer wall of the pipe flange (10).

4. The bidirectional accumulator according to claim 1, characterized in that: A circular buffer groove (211) is provided on the end surface of the piston close to the slurry, and a weight reduction groove (212) is provided on the end surface of the piston away from the slurry. L-shaped sliding ring type combined sealing rings (213) are provided on both the front and rear ends of the piston side wall.

5. The bidirectional accumulator according to claim 1, characterized in that: One end of the gas passage (5) away from the gas inlet valve (52) is closed and is equipped with a pressure gauge (53).

6. The bidirectional accumulator according to claim 1, characterized in that: The slurry channel (4) and the gas channel (5) are both arranged transversely and distributed left and right.

7. The bidirectional accumulator according to claim 6, characterized in that: The upper chamber (3), the lower chamber (2), the slurry channel (4) and the gas channel (5) are arranged parallel to each other.

8. The bidirectional accumulator according to claim 7, characterized in that: An air groove (22) is provided at one end of the upper chamber (3) away from the three-way pipe (7) and at one end of the lower chamber (2) away from the liquid inlet port (81). The side walls of the two air grooves (22) are connected to the gas channel (5) through the inclined holes (51), so that the chambers can separate gas and liquid phases with the piston as the boundary. The inclined holes (51) are perpendicular to the gas channel (5) and are arranged at an angle.

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