Multi-order displacement type fluid inerter and inerter coefficient adjusting method

Abstract

The invention relates to a multi-stage displacement type fluid inerter which comprises a piston system, a cylinder barrel and spiral pipes, the cylinder barrel comprises one or more first cavities and one or more second cavities, the first cavities and the second cavities are arranged in an end-to-end connection mode, and the spiral pipes are distributed outside a cylinder body where the first cavities and the second cavities are located; the piston system comprises a piston rod, the piston rod penetrates through the first cavity and the second cavity, a first piston and a second piston are arranged on the piston rod, and the first piston and the second piston are located in the first cavity and the second cavity respectively; the first cavity comprises a first cavity working section, and the section of the first cavity working section is matched with the first piston; the second cavity comprises a second cavity working section and a second cavity free section, the section of the second cavity working section is matched with the second piston, and the section of the second cavity free section is larger than that of the second piston. Compared with the prior art, the device has the advantages of being simple in structure, reliable in work, capable of adjusting the inerter coefficient in a self-adaptive mode and the like.

Description

Technical Field

[0001] The invention relates to the technical field of wind engine vibration control, in particular to a multi-stage displacement type fluid inertia container and an inertia coefficient adjustment method. Background Art

[0002] The fluid inertia container is a device that integrates damping and inertia effect. Its inertia effect is achieved by the change in the speed of the working fluid between the spiral tube and the piston chamber. The variable inertia coefficient fluid inertia container is proposed to solve the adaptability problem of different working systems. Applying the variable inertia coefficient fluid inertia container to the control of wind turbines can achieve efficient vibration control of wind turbines under the coupling of wind, earthquake and wave disasters.

[0003] Patent CN105276060B controls the on-off of the active control pipeline to adjust the flow mode of the oil in different spiral tubes, thereby realizing a liquid inertia container device with three levels of adjustable inertia coefficients of "large", "medium" and "small". Patent CN118306153A proposes a valve-controlled constant damping adjustable fluid inertia device, which realizes the switching of two liquid flow pipelines through a high-speed switching valve to achieve adjustable inertia coefficient. The above two patents belong to active inertia containers, which need to be adjusted according to a certain rule through feedback signals and lack adaptability. Patent CN117646775A proposes a passive frequency adaptive fluid inertia device, which changes the flow path of the oil by changing the position of the valve core. The above three patents all use a valve system structure to change the flow path of the working fluid, but the valve system structure has problems such as high processing precision requirements, high cost, and low durability. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a multi-stage displacement fluid inertia container and an inertia coefficient adjustment method which has a simple structure, reliable operation and can adaptively adjust the inertia coefficient.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, there is provided a multi-stage displacement fluid inertia container, comprising a piston system, a cylinder barrel and a spiral tube, wherein the cylinder barrel comprises a first chamber and a second chamber, the number of the first chamber and the second chamber are both one or more, the first chamber and the second chamber are arranged end to end, and the spiral tube is distributed outside the cylinder body where the first chamber and the second chamber are located;

[0007] The piston system includes a piston rod, the piston rod passes through the first chamber and the second chamber, and the piston rod is provided with a first piston and a second piston, the number of the first pistons corresponds to the number of the first chambers and is located in the first chamber, and the number of the second pistons corresponds to the number of the second chambers and is located in the second chamber;

[0008] The first chamber includes a first chamber working section, and the cross-section of the first chamber working section matches the first piston; the second chamber includes a second chamber working section and a second chamber free section, and the cross-section of the second chamber working section matches the second piston, and the cross-section of the second chamber free section is larger than the cross-section of the second piston.

[0009] Furthermore, the spiral tube includes a first spiral tube and a second spiral tube. The first spiral tube is distributed outside the cylinder body at the first chamber position of the cylinder barrel, and the second spiral tube is distributed outside the cylinder body at the second chamber position of the cylinder barrel.

[0010] Furthermore, two first communicating ports are provided between the first spiral tube and the first chamber, the first communicating ports are located at both ends of the first chamber, and the first piston is located between the two first communicating ports; two second communicating ports are provided between the second spiral tube and the second chamber, the second communicating ports are located at both ends of the second chamber, and the second piston is located between the two second communicating ports.

[0011] Furthermore, working liquid flows between the first chamber and the first spiral tube, and working liquid flows between the second chamber and the second spiral tube.

[0012] Furthermore, the cylinder barrel also includes a cavity, which is located at the right end of the cylinder barrel, and the right end of the piston rod is located in the cavity.

[0013] Furthermore, the axial length of the cavity is greater than or equal to the maximum stroke of the piston system in the cylinder.

[0014] Furthermore, the second chamber free section is located in the middle of the second chamber, the second chamber working section is located on both sides of the second chamber free section, and the length of the second chamber free section of each of the plurality of second chambers is independently selected according to demand.

[0015] Furthermore, the first piston is fixedly connected to the piston rod, and the second piston is fixedly connected to the piston rod.

[0016] Furthermore, the left end surface of the piston rod and the right end surface of the cylinder are both provided with connection points, and the connection points are used to connect the multi-stage displacement type fluid inertia container to a connection point where an inertia container is required.

[0017] According to another aspect of the present invention, a method for adjusting the inertia coefficient of a multi-stage displacement type fluid inertia container is provided, comprising the following steps:

[0018] Obtaining the inertia coefficient requirement of the application scenario, adjusting the length of the free section of the second chamber, and calculating the inertia coefficient of the hydraulic fluid inertia device with variable stroke force until the inertia coefficient requirement is met;

[0019] The inertia coefficient calculation expression of the multi-stage displacement type fluid inertia container includes an I-stage expression and a II-stage expression. When the second piston moves in the free section of the second chamber, the I-stage expression is used to calculate the inertia coefficient of the multi-stage displacement type fluid inertia container; when the second piston moves in the working section of the second chamber, the II-stage expression is used to calculate the inertia coefficient of the multi-stage displacement type fluid inertia container;

[0020] The expression of phase I is:

[0021]

[0022] In the formula, m in,1 is the inertia coefficient of the second piston when it moves in the free section of the second chamber, ρ is the density of the working fluid, r1 is the radius of the first piston, r3 is the diameter of the piston rod, r4 is the radius of the first spiral tube, r5 is the spiral radius of the first spiral tube, l1 is the total length of the first spiral tube, d1 is the pitch of the first spiral tube,

[0023] The expression of phase II is:

[0024]

[0025] Wherein, r2 is the radius of the second piston, r6 is the radius of the second spiral tube, r7 is the spiral radius of the second spiral tube, l2 is the total length of the second spiral tube, and d2 is the pitch of the first spiral tube.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. The present invention proposes a multi-stage displacement fluid inertia container, which mainly includes multiple working chambers, a spiral tube, a working liquid and a piston system; the spiral tube is wound outside the cylinder body of the working chamber, the working liquid is located between the spiral tube and the working chamber, and the working liquid can circulate through the spiral tube to produce an inertia effect; the working chamber has two different chambers, a first chamber and a second chamber, the cross section of the first chamber is completely matched with the piston of the piston system, and the second chamber contains a free section with a cross section slightly larger than the piston in the chamber, and the piston does not make working contact with the cylinder in the free section; for each working chamber, the movement of the piston rod drives the working liquid to circulate through the spiral tube to achieve mass efficiency; when the piston rod is in different working strokes, different numbers of working chambers will be adaptively called to achieve adaptive adjustment of the inertia coefficient.

[0028] 2. The inertia coefficient parameter design of the present invention is flexible, and the inertia coefficient can be adjusted by adjusting the length of the spiral tube, the cross-sectional area of ​​the spiral tube and the working liquid in the chamber.

[0029] 3. The present invention has a simple structure and realizes adaptive change of the inertia coefficient through a specific multi-cavity structure, avoids the use of a valve system structure, gets rid of the need for manual control, has good processability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a multi-stage displacement type fluid inertia container;

[0031] Figure 2 It is a schematic diagram of the piston system of a multi-stage displacement type fluid inertia container;

[0032] Figure 3 It is a schematic diagram of the cylinder section of a multi-stage displacement type fluid inertia container;

[0033] Figure 4 It is a schematic diagram of the operation of the multi-stage displacement type fluid inertia container component in stage I;

[0034] Figure 5 It is a schematic diagram of the operation of the multi-stage displacement type fluid inertia container component in stage II;

[0035] Figure 6 It is the output and displacement curve of multi-stage displacement fluid inertia container;

[0036] Figure 7 Schematic diagram of the application of multi-stage displacement fluid inertia container on wind power tower.

[0037] Among them, 1. piston system, 2. first chamber, 3. second chamber, 4. cavity, 5. first spiral tube, 6. second spiral tube, 7. cylinder, 8. first piston, 9. second piston, 10. piston rod, 11. first chamber working section, 12. second chamber working section, 13. second chamber free section, 14. multi-stage displacement fluid inertia container, 15. tower, 16. swing mass block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] The multi-stage displacement fluid inertia container involved in the present invention allows the number of chambers to be 2 or more, each chamber has a matching spiral tube and piston, each piston is connected to the piston rod 10, and its connection form and working principle are the same as described below. As a preferred embodiment, the number of the first chamber 2 and the second chamber 3 can be one or more, and the number and length of the second chamber free section 13 of each second chamber 3 can be set as needed, thereby providing more change orders. Simplified, in order to realize the basic function of the present invention, the implementation of two chambers is taken as an example.

[0040] like Figure 1-Figure 3 As shown, the present invention relates to a multi-stage displacement fluid inertia container, comprising a piston system 1, a cylinder 7 and a spiral tube, wherein the cylinder 7 contains a first chamber 2, a second chamber 3 and a cavity 4, the piston system 1 comprises a first piston 8, a second piston 9 and a piston rod 10, and the spiral tube comprises a first spiral tube 5 and a second spiral tube 6. The first spiral tube 5 is matched with the first chamber 2, the second spiral tube 6 is matched with the second chamber, and the first piston 8 and the second piston 9 are connected to the piston rod 10 in sequence.

[0041] In this embodiment, in order to describe its working principle, the first chamber 2 and the second chamber 3 can be classified into the first chamber working section 11, and the second chamber 3 can be divided into the second chamber working section 12 and the second chamber free section 13. Figure 3 As shown, the first chamber working section 11 is the interval where the first piston 8 and the cylinder 7 are in working contact, the second chamber working section 12 is the interval where the second piston 9 and the cylinder 7 are in working contact, and the second chamber free section 13 is the interval where the second piston 9 is not in working contact with the cylinder 7. Therefore, the radius of the cylinder 7 in the second chamber free section 13 needs to be larger than the radius of the second piston 9.

[0042] The operation phases of the above device are divided into Phase I and Phase II. Figure 4 The operating rules of each component in the device under the small stroke of stage I are shown. Figure 5 The operating rules of each component in the device under the large stroke of stage II are demonstrated, wherein the solid arrow represents the movement direction of the piston rod 10 , and the dotted arrow represents the movement direction of the working fluid in the first chamber 2 and the second chamber 3 .

[0043] Assuming that the distance between the second piston 9 and the edge of the second chamber free section 13, that is, the critical displacement is L, when the displacement x of the piston rod 10 is less than L, the multi-stage displacement fluid inertia container is in stage I, and the working fluid in the first chamber 2 starts to circulate driven by the first piston 8 to achieve the inertia effect; at this time, the second piston 9 is in the second chamber free section 13, and the working fluid can move directly through the gap between the cylinder 7 and the second piston 9, so the inertia effect jointly generated by the second chamber 3 and the second spiral tube 6 can be ignored.

[0044] When the displacement x of the piston rod 10 is greater than L, the multi-stage displacement fluid inertia container is in stage II, and the second piston 9 enters the second chamber working section 12 from the second chamber free section 13. At this time, the working fluids in the two chambers begin to circulate through their respective spiral tubes, thereby generating a greater inertia effect than stage I, thereby achieving adaptive changes in the inertia coefficient. The change law of the inertia coefficient of the multi-stage displacement fluid inertia container can be expressed as follows: Figure 6 shown.

[0045] The calculation steps of the inertia coefficient of the multi-stage displacement type fluid inertia container are as follows: Assume that the working fluid in the cylinder is incompressible, the radius of the first piston 8 is r1, the radius of the second piston 9 is r2, the diameter of the piston rod 10 is r3, the radius of the first spiral tube 5 is r4, the spiral radius of the first spiral tube 5 is r5, the total length of the first spiral tube 5 is l1, the pitch of the first spiral tube 5 is d1, and the radius of the second spiral tube 6 is r d , the spiral radius of the second spiral tube 6 is r7, the total length of the second spiral tube 6 is l2, the pitch of the second spiral tube 6 is d2, and the working liquid density is ρ. Based on the above parameters, the effective area of ​​liquid flow in the first chamber 2 is The effective cross-sectional area of ​​the liquid in the first spiral tube 5 is The mass of the working fluid in the first spiral tube 5 can be expressed as m1=ρS2l1. When the displacement of the first piston 8 is x, assuming that the angle of rotation of the working fluid entering the first spiral tube 5 is θ1, according to the principle of conservation of fluid volume, the following formula can be obtained:

[0046]

[0047] The moment of inertia generated when the working fluid moves in the first spiral tube 5 is: According to the law of conservation of energy, the kinetic energy of the working fluid in the first chamber is the same as that in the first spiral tube 5.

[0048]

[0049] According to formulas (1) and (2), the inertia coefficient that can be generated in stage I of the multi-stage displacement fluid inertia container is:

[0050]

[0051] Similarly, the inertia coefficient that can be generated in the second stage of the multi-stage displacement fluid inertia container is:

[0052]

[0053] The multi-stage displacement type fluid inertia container involved in the present invention allows the existence of two or more chambers. The inertia coefficient in the case of multiple chambers can be obtained by the same principle, thereby realizing an adaptive inertia coefficient under multi-stage critical displacement.

[0054] like Figure 7 As shown, a multi-order displacement type fluid inertia container is applied to the control of a wind turbine generator set. The multi-order displacement type fluid inertia container 14 is connected in series with a swing mass block 16 and installed in the tower 15 of the wind turbine generator set, so that the vibration of the wind turbine generator set under the coupling of wind, earthquake and wave disasters can be efficiently controlled.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A multi-stage displacement fluid inertia container, characterized in that: The invention comprises a piston system (1), a cylinder (7) and a spiral tube, wherein the cylinder (7) comprises a first chamber (2) and a second chamber (3), the number of the first chamber (2) and the number of the second chamber (3) are both one or more, the first chamber (2) and the second chamber (3) are arranged end to end, and the spiral tube is distributed outside the cylinder body where the first chamber (2) and the second chamber (3) are located; The piston system (1) comprises a piston rod (10), the piston rod (10) passes through a first chamber (2) and a second chamber (3), and a first piston (8) and a second piston (9) are arranged on the piston rod (10), the number of the first pistons (8) corresponds to the number of the first chambers (2) and are located in the first chamber (2), and the number of the second pistons (9) corresponds to the number of the second chambers (3) and are located in the second chamber (2); The first chamber (2) comprises a first chamber working section (11), the cross section of which matches the first piston (8); the second chamber (3) comprises a second chamber working section (12) and a second chamber free section (13), the cross section of which matches the second piston (9), and the cross section of the second chamber free section (13) is larger than the cross section of the second piston (9).

2. A multi-stage displacement fluid inertia container according to claim 1, characterized in that: The spiral tube comprises a first spiral tube (5) and a second spiral tube (6), wherein the first spiral tube (5) is distributed outside the cylinder body of the cylinder barrel (7) at the position of the first chamber (2), and the second spiral tube (6) is distributed outside the cylinder body of the cylinder barrel (7) at the position of the second chamber (3).

3. A multi-stage displacement fluid inertia container according to claim 2, characterized in that: Two first communication ports are provided between the first spiral tube (5) and the first chamber (2), the first communication ports are located at the two ends of the first chamber (2), and the first piston (8) is located between the two first communication ports; two second communication ports are provided between the second spiral tube (6) and the second chamber (3), the second communication ports are located at the two ends of the second chamber (3), and the second piston (9) is located between the two second communication ports.

4. The multi-stage displacement fluid inertia container according to claim 2, characterized in that: Working liquid flows between the first chamber (2) and the first spiral tube (5), and working liquid flows between the second chamber (3) and the second spiral tube (6).

5. The multi-stage displacement fluid inertia container according to claim 1, characterized in that: The cylinder barrel (7) further comprises a cavity (4), wherein the cavity (4) is located at the right end of the cylinder barrel (7), and the right end of the piston rod (10) is located in the cavity (4).

6. The multi-stage displacement fluid inertia container according to claim 5, characterized in that: The axial length of the cavity (4) is greater than or equal to the maximum stroke of the piston system (1) in the cylinder (7).

7. The multi-stage displacement fluid inertia container according to claim 1, characterized in that: The second chamber free section (13) is located in the middle of the second chamber (3), the second chamber working section (12) is located on both sides of the second chamber free section (13), and the length of each of the second chamber free sections (13) of the plurality of second chambers (3) is independently selected according to demand.

8. The multi-stage displacement fluid inertia container according to claim 1, characterized in that: The first piston (8) and the piston rod (10) are fixedly connected, and the second piston (9) and the piston rod (10) are fixedly connected.

9. The multi-stage displacement fluid inertia container according to claim 1, characterized in that: The left end surface of the piston rod (10) and the right end surface of the cylinder (7) are both provided with connection points, and the connection points are used to connect the multi-stage displacement type fluid inertia container to a connection point requiring inertia container.

10. A method for adjusting the inertia coefficient of a multi-stage displacement type fluid inertia container according to any one of claims 1 to 9, characterized in that: The following steps are involved: Obtaining the inertia coefficient requirement of the application scenario, adjusting the length of the free section of the second chamber, and calculating the inertia coefficient of the hydraulic fluid inertia device with variable stroke force until the inertia coefficient requirement is met; The inertia coefficient calculation expression of the multi-stage displacement type fluid inertia container comprises a phase I expression and a phase II expression. When the second piston (9) moves in the second chamber free section (13), the phase I expression is used to calculate the inertia coefficient of the multi-stage displacement type fluid inertia container; when the second piston (9) moves in the second chamber working section (12), the phase II expression is used to calculate the inertia coefficient of the multi-stage displacement type fluid inertia container. The I stage expression is: In the formula, m in,1 is the inertia coefficient of the second piston when it moves in the free section of the second chamber, ρ is the density of the working fluid, r1 is the radius of the first piston, r3 is the diameter of the piston rod, r4 is the radius of the first spiral tube, r5 is the spiral radius of the first spiral tube, l1 is the total length of the first spiral tube, d1 is the pitch of the first spiral tube, The phase II expression is: Wherein, r2 is the radius of the second piston, r6 is the radius of the second spiral tube, r7 is the spiral radius of the second spiral tube, l2 is the total length of the second spiral tube, and d2 is the pitch of the first spiral tube.

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