Buffer device

Abstract

The invention relates to the technical field of buffers, and discloses a buffer device which comprises a buffer cylinder, a buffer cylinder, a buffer cylinder cover, a buffer cylinder cover and a buffer cylinder cover. A piston head is arranged at one end of the piston rod, the piston rod is inserted into the buffer cylinder in a sliding mode, the piston head is contained in the buffer cavity, and the buffer solution covers the piston head; the liquid flow pipe and the buffering cylinder are provided with a first liquid opening and a second liquid opening which are both communicated with the buffering cavity, the first liquid opening is located above the second liquid opening, the piston head is located between the first liquid opening and the second liquid opening, the two ends of the liquid flow pipe are connected with the first liquid opening and the second liquid opening respectively, and the liquid flow pipe is spirally wound on the peripheral wall of the buffering cylinder. The buffer device provided by the invention can form an inerter system and has a hindering effect on sliding of the piston head so as to realize buffering.

Description

Technical Field

[0001] The present invention relates to the technical field of buffers, and in particular to a buffer device. Background Art

[0002] At present, electromagnetic repulsion mechanisms are widely used in the field of switches due to their advantages of simple structure, fast opening and closing speed, short time, and small dispersion. In order to reduce the strong mechanical collision caused by the electromagnetic repulsion mechanism at the end of opening and closing, which may cause mechanical damage, a buffer is often set for buffering.

[0003] The electrorheological fluid buffer in the prior art requires an additional external power supply and signal generating device to be provided for the electrorheological fluid, has a complex structure, a passive vibration response, and has low corresponding buffering performance and damping effect. In addition, the instantaneous impact will cause a large vibration impact on the buffer. Summary of the invention

[0004] The purpose of the present invention is to provide a buffer device with a simple structure, which can form an inertia system and produce an obstruction effect on the sliding of the piston head to achieve buffering.

[0005] In order to achieve the above object, the present invention provides a buffer device, comprising:

[0006] A buffer cylinder, wherein the buffer cylinder has a buffer cavity inside, and a buffer solution is stored in the buffer cavity;

[0007] A piston rod, one end of which is provided with a piston head, the piston rod is slidably inserted on the buffer cylinder, and the piston head is accommodated in the buffer cavity, the outer diameter of the piston head is smaller than the inner diameter of the buffer cylinder, and the buffer covers the piston head;

[0008] A liquid flow tube, the buffer cylinder is provided with a first liquid port and a second liquid port both connected to the buffer cavity, the first liquid port is located below the second liquid port, the piston head is located between the first liquid port and the second liquid port, the two ends of the liquid flow tube are respectively connected to the first liquid port and the second liquid port, and the liquid flow tube is spirally wound on the outer peripheral wall of the buffer cylinder.

[0009] Furthermore, the buffer device also includes a partition, which is arranged inside the buffer cylinder and located below the buffer cavity, and a buffer spring is provided between the piston head and the partition.

[0010] Furthermore, the buffer device also includes a guide rod, one end of which passes through the buffer cylinder and the piston head in sequence and is arranged on the partition plate, the extension direction of the guide rod is parallel to the sliding direction of the piston rod, and the buffer spring is sleeved on the outer periphery of the guide rod.

[0011] Furthermore, the buffer device includes at least two guide rods, and the guide rods are symmetrically arranged on the partition plate with the piston rod as the center.

[0012] Furthermore, the buffer cylinder also has a accommodating chamber inside, the partition is located between the buffer chamber and the accommodating chamber, and is used to separate the buffer chamber and the accommodating chamber, the accommodating chamber is located below the buffer chamber, a piezoelectric sensor is accommodated in the accommodating chamber, a first electrode sheet and a second electrode sheet are provided in the buffer chamber, the first electrode sheet and the second electrode sheet are both immersed in the buffer solution, the first electrode sheet is electrically connected to one electrode of the piezoelectric sensor, the second electrode sheet is electrically connected to another electrode of the piezoelectric sensor, the pressure detection end of the piezoelectric sensor is in contact with the partition, and the buffer solution is an electrorheological fluid.

[0013] Furthermore, the first electrode sheet is arranged on the inner wall of the buffer cavity, and the second electrode sheet is arranged on the piston rod.

[0014] Furthermore, locking nuts are fixedly provided at both ends of the liquid flow tube, the locking nuts have external threads, the first liquid port and the second liquid port are both threaded holes, and the locking nuts are meshed with the threaded holes.

[0015] Furthermore, an isolation layer is provided between the outer edge of the piston head and the inner wall of the buffer cavity.

[0016] Compared with the prior art, a buffer device in an embodiment of the present invention has the following beneficial effects: two ends of the liquid flow tube are respectively connected to the first liquid port and the second liquid port, and the liquid flow tube is spirally wound on the outer peripheral wall of the buffer cylinder. When the piston head slides in the buffer cavity, the buffer solution is pressed into the liquid flow tube from the first liquid port under the pressure of the piston head, or the buffer solution flows out of the second liquid port into the buffer cavity. Since the inner diameter of the buffer cavity is much larger than the inner diameter of the liquid flow tube, when the buffer solution is pressed into the liquid flow tube, the flow velocity changes suddenly, and the flow velocity of the buffer solution in the liquid flow tube is much larger than the flow velocity of the buffer solution in the buffer cavity, thereby forming an inertial volume system, which generates an inertial force in the vertical direction on the bottom surface of the piston head, and generates an obstructive effect on the sliding of the piston to achieve buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of a buffer device according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A partial enlarged view of point A;

[0019] In the figure, 1, buffer cylinder; 101, buffer chamber; 102, receiving chamber; 103, buffer

[0020] 2. Piston rod;

[0021] 3. Piston head;

[0022] 4. Liquid flow tube; 401. First liquid port; 402. Second liquid port;

[0023] 5. Partition;

[0024] 6. Buffer spring;

[0025] 7. Guide rod;

[0026] 8. Piezoelectric sensor;

[0027] 9. A first electrode sheet;

[0028] 10. A second electrode sheet;

[0029] 11. Locking nut;

[0030] 12. Isolation layer. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal" and the like used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0033] In the description of the present invention, the terms "provided with", "set", "connected", and "placed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0035] The technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0036] like Figure 1 , 2 As shown, a buffer device according to an embodiment of the present invention includes:

[0037] A buffer cylinder 1, wherein the buffer cylinder 1 has a buffer cavity 101 inside, and a buffer 103 is stored in the buffer cavity 101;

[0038] A piston rod 2, one end of which is provided with a piston head 3, the piston rod 2 is slidably inserted on the buffer cylinder 1, and the piston head 3 is accommodated in the buffer cavity 101, the outer diameter of the piston head 3 is smaller than the inner diameter of the buffer cylinder 1, and the buffer 103 covers the piston head 3;

[0039] The liquid flow tube 4 and the buffer cylinder 1 are provided with a first liquid port 401 and a second liquid port 402 both connected to the buffer chamber 101, the first liquid port 401 is located below the second liquid port 402, the piston head 3 is located between the first liquid port 401 and the second liquid port 402, the two ends of the liquid flow tube 4 are respectively connected to the first liquid port 401 and the second liquid port 402, and the liquid flow tube 4 is spirally wound on the outer peripheral wall of the buffer cylinder 1.

[0040] Based on the above technical solution, the two ends of the liquid flow tube 4 are respectively connected to the first liquid port 401 and the second liquid port 402, and the liquid flow tube 4 is spirally wound on the outer peripheral wall of the buffer cylinder 1. When the piston head 3 slides in the buffer chamber 101, the buffer 103 is pressed into the liquid flow tube 4 by the pressure of the piston head 3. Since the inner diameter of the buffer chamber 101 is much larger than the inner diameter of the liquid flow tube 4, when the buffer 103 is pressed into the liquid flow tube 4 from the first liquid port 401 or the buffer 103 flows out of the buffer chamber 101 from the second liquid port 402, there is a sudden change in flow rate. The flow rate of the buffer 103 in the liquid flow tube 4 is much larger than the flow rate of the buffer 103 in the buffer chamber 101, thereby forming an inertial volume system, which generates an inertial force in the vertical direction on the bottom surface of the piston head 3, and hinders the sliding of the piston to achieve buffering.

[0041] Preferably, the buffer device further comprises a partition 5, which is arranged inside the buffer cylinder 1 and below the buffer cavity 101, and a buffer spring 6 is arranged between the piston head 3 and the partition 5. The buffer spring 6 is arranged between the piston head 3 and the partition 5, and when the piston head 3 slides downward within a certain range, the buffer spring 6 provides an upward elastic force to the piston head 3, and when the piston head 3 slides upward, the buffer spring 6 provides a downward elastic force to the piston head 3, and the piston head 3 needs to overcome the elastic force of the buffer spring 6 to slide, and the buffer spring 6 provides a buffering effect to the piston head 3.

[0042] More preferably, the buffer device further comprises a guide rod 7, one end of which passes through the buffer cylinder 1 and the piston head 3 in sequence and is arranged on the partition plate 5, the extension direction of the guide rod 7 is parallel to the sliding direction of the piston rod 2, and the buffer spring 6 is sleeved on the outer circumference of the guide rod 7. By setting the guide rod 7 to limit the sliding direction of the piston head 3, the stability of the piston head 3 sliding in the vertical direction is ensured.

[0043] More preferably, the buffer device includes at least two guide rods 7, which are symmetrically arranged on the partition plate 5 with the piston rod 2 as the center. The guide rods 7 are symmetrically arranged on the partition plate 5 with the piston rod 2 as the center to ensure that the piston head 3 is evenly stressed to prevent the piston head 3 from tilting when the piston rod 2 reciprocates.

[0044] More preferably, the buffer cylinder 1 further has a accommodating chamber 102, the partition 5 is located between the buffer chamber 101 and the accommodating chamber 102, and is used to separate the buffer chamber 101 from the accommodating chamber 102, the accommodating chamber 102 is located below the buffer chamber 101, and the piezoelectric sensor 8 is accommodated in the accommodating chamber 102. The buffer chamber 101 is provided with a first electrode sheet 9 and a second electrode sheet 10, and the first electrode sheet 9 and the second electrode sheet 10 are both immersed in the buffer solution 103, the first electrode sheet 9 is electrically connected to one electrode of the piezoelectric sensor 8, and the second electrode sheet 10 is electrically connected to the other electrode of the piezoelectric sensor 8, the pressure detection end of the piezoelectric sensor 8 is in contact with the partition 5, and the buffer solution 103 is an electrorheological fluid.

[0045] Specifically, the piezoelectric sensor 8 is made of piezoelectric ceramics.

[0046] Based on the above technical solution, since the two ends of the buffer spring 6 are respectively connected to the bottom of the piston head 3 and the partition 5, when the piston head 3 slides downward, the piston head 3 transfers the pressure to the partition 5 through the buffer spring 6, and the partition 5 is connected to the pressure detection end of the piezoelectric sensor 8. The piezoelectric sensor 8 is pressurized, and an electric field is formed between the first electrode sheet 9 and the second electrode sheet 10. The electrorheological fluid produces an electrorheological effect under the action of the electric field, and the shear stress of the electrorheological fluid increases, thereby making its fluidity worse and its viscosity increased. The shear stress generated between the piston head 3 and the buffer cavity 101 prevents the two from sliding relative to each other, thereby achieving a buffering effect.

[0047] More preferably, the first electrode sheet 9 is disposed on the inner wall of the buffer chamber 101 , and the second electrode sheet 10 is disposed on the piston rod 2 .

[0048] Specifically, when viewed in the horizontal direction, the first electrode sheet 9 covers the inner wall of the buffer cavity 101 corresponding to the second electrode sheet 10 on its sliding path.

[0049] When the piston head 3 slides from the state where the buffer spring 6 does not undergo elastic deformation to the state where the buffer spring 6 undergoes elastic deformation, the minimum distance between the first electrode sheet 9 and the second electrode sheet 10 remains unchanged, and the pressure of the piston head 3 on the buffer spring 6 and the partition 5 increases. Under the action of the piezoelectric sensor 8, the electric potential between the first electrode sheet 9 and the second electrode sheet 10 increases, the electric field strength is significantly enhanced, and the shear stress of the electrorheological fluid is significantly increased. Therefore, when the electromagnetic repulsion mechanism is at the end of opening and closing, the buffering effect of the buffer device is better than that of the electromagnetic repulsion mechanism at the beginning of opening and closing, and can better absorb the impact inertia of the electromagnetic repulsion mechanism.

[0050] Preferably, locking nuts 11 are fixedly provided at both ends of the liquid flow tube 4, and the locking nuts 11 have external threads. The first liquid port 401 and the second liquid port 402 are both threaded holes, and the locking nuts 11 are engaged with the threaded holes. Locking nuts 11 are provided at both ends of the liquid flow tube 4, and the locking nuts 11 are threadedly connected to the first liquid port 401 and the second liquid port 402, which is convenient for installation and disassembly.

[0051] Preferably, an isolation layer 12 is provided between the outer edge of the piston head 3 and the inner wall thereof. The isolation layer 12 is provided on the outer edge of the piston head 3 and slides with the piston head 3. The isolation layer 12 is used to prevent the electrorheological fluid from flowing through the gap between the piston head 3 and the inner wall of the buffer chamber 101.

[0052] In summary, the embodiment of the present invention provides a buffer device, wherein the two ends of the liquid flow tube 4 are respectively connected to the first liquid port 401 and the second liquid port 402, and the liquid flow tube 4 is spirally wound on the outer peripheral wall of the buffer cylinder 1. When the piston head 3 slides in the buffer cavity 101, the buffer 103 is pressed into the liquid flow tube 4 by the pressure of the piston head 3. Since the inner diameter of the buffer cavity 101 is much larger than the inner diameter of the liquid flow tube 4, when the buffer 103 is pressed into the liquid flow tube 4 from the first liquid port 401 or the buffer 103 flows out of the buffer cavity 101 from the second liquid port 402, there is a sudden change in flow rate. The flow rate of the buffer 103 in the liquid flow tube 4 is much larger than the flow rate of the buffer 103 in the buffer cavity 101, thereby forming an inertial system, which produces a vertical impact on the bottom surface of the piston head 3. The inertial force has an obstructive effect on the sliding of the piston to achieve buffering; a buffer spring 6 is arranged between the partition 5 and the piston head 3, and the buffer spring 6 has an obstructive effect on the sliding of the piston head 3; a piezoelectric sensor 8 is arranged in the accommodating chamber 102, and the pressure detection end of the piezoelectric sensor 8 is connected to the partition 5, and the first electrode sheet 9 and the second electrode sheet 10 are arranged in the buffer chamber 101, so when the pressure detection end of the piezoelectric sensor 8 is compressed or pulled, an electric field is generated between the first electrode sheet 9 and the second electrode sheet 10, which acts on the electrorheological fluid to cause the shear stress of the electrorheological fluid, thereby increasing the viscosity, preventing the piston head 3 from sliding relative to the buffer chamber 101, and multiple buffering methods act on the piston head 3 at the same time, which has a good buffering effect on the sliding of the piston head 3.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A buffer device, characterized in that: include: A buffer cylinder (1), wherein the buffer cylinder (1) has a buffer cavity (101) inside, and a buffer solution (103) is stored in the buffer cavity (101); A piston rod (2), one end of the piston rod (2) is provided with a piston head (3), the piston rod (2) is slidably inserted into the buffer cylinder (1), and the piston head (3) is accommodated in the buffer cavity (101), and the buffer (103) covers the piston head (3); A liquid flow tube (4), the buffer cylinder (1) is provided with a first liquid port (401) and a second liquid port (402) both of which are connected to the buffer cavity (101), the first liquid port (401) is located below the second liquid port (402), the piston head (3) is located between the first liquid port (401) and the second liquid port (402), the two ends of the liquid flow tube (4) are respectively connected to the first liquid port (401) and the second liquid port (402), and the liquid flow tube (4) is spirally wound on the outer peripheral wall of the buffer cylinder (1).

2. The buffer device according to claim 1, characterized in that: It also comprises a partition plate (5), wherein the partition plate (5) is arranged inside the buffer cylinder (1) and is located below the buffer cavity (101), and a buffer spring (6) is provided between the piston head (3) and the partition plate (5).

3. The buffer device according to claim 2, characterized in that: It also comprises a guide rod (7), one end of which passes through the buffer cylinder (1) and the piston head (3) in sequence and is arranged on the partition plate (5), the extension direction of the guide rod (7) is parallel to the sliding direction of the piston rod (2), and the buffer spring (6) is sleeved on the outer periphery of the guide rod (7).

4. The buffer device according to claim 3, characterized in that: It comprises at least two guide rods (7), wherein the guide rods (7) are symmetrically arranged on the partition plate (5) with the piston rod (2) as the center.

5. The buffer device according to claim 4, characterized in that: The buffer cylinder (1) further comprises a receiving chamber (102) therein; the partition (5) is located between the buffer chamber (101) and the receiving chamber (102) and is used to separate the buffer chamber (101) from the receiving chamber (102); the receiving chamber (102) is located below the buffer chamber (101); a piezoelectric sensor (8) is accommodated in the receiving chamber (102); a first electrode sheet (9) and a second electrode sheet (10) are arranged in the buffer chamber (101); the first electrode sheet (9) and the second electrode sheet (10) are both immersed in the buffer solution (103); the first electrode sheet (9) is electrically connected to one electrode of the piezoelectric sensor (8); the second electrode sheet (10) is electrically connected to another electrode of the piezoelectric sensor (8); the pressure detection end of the piezoelectric sensor (8) is in contact with the partition (5); and the buffer solution (103) is an electrorheological fluid.

6. The buffer device according to claim 5, characterized in that: The first electrode sheet (9) is arranged on the inner wall of the buffer chamber (101), and the second electrode sheet (10) is arranged on the piston rod (2).

7. The buffer device according to claim 1, characterized in that: Locking nuts (11) are fixedly provided at both ends of the liquid flow tube (4), the locking nuts (11) having external threads, the first liquid port (401) and the second liquid port (402) are both threaded holes, and the locking nuts (11) mesh with the threaded holes.

8. The buffer device according to claim 1, characterized in that: An isolation layer (12) is provided between the outer edge of the piston head (3) and the inner wall of the buffer chamber (101).

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