Pressure pulse suppression device of hydraulic system

Abstract

The invention discloses a hydraulic system pressure pulse suppression device which comprises a shell, a hydraulic system pressure pulse suppression device and a hydraulic system pressure pulse suppression device. A center cavity is formed in the shell, and an oil inlet and an oil outlet are formed in the two sides of the center cavity respectively; the input pipe is arranged outside the oil liquid inlet, the input pipe is used for feeding hydraulic oil into the central cavity, and an output pipe is arranged at the oil liquid outlet; the outer pipe seat is arranged on the shell and is positioned on one side of the oil liquid inlet; the damping pipe is coaxially arranged in the central cavity; the sealing seat is fixed on the shell and is positioned on one side of the oil liquid outlet; the bypass ports are distributed at one end, close to the damping pipe, of the straight pipe in a circumferential array manner; the modulation unit is coaxially arranged between the outer tube seat and the shell; the damping pipe can be matched with the shell to form a circulation channel and a direct flow channel, and in hydraulic system pulse suppression, the damping device can be adaptively adjusted, so that the circulation channel or the direct flow channel is adopted as a main flow channel to form two different oil feeding modes, and the damping device adapts to different hydraulic working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic equipment, in particular to a pressure pulse suppression device for a hydraulic system. Background Art

[0002] Hydraulic systems can transmit large torque and are widely used in transmission systems. As hydraulic technology develops towards high pressure, high speed and large flow, the impact of pressure pulsation inherent in hydraulic systems has become increasingly prominent. Pressure pulsation is generated by flow pulsation through system impedance. The common method of eliminating pressure pulsation in traditional technology is to install a hydraulic filter on the pipeline to reduce the input impedance of the system. In the prior art, such as the invention patent with publication number CN105864156A, the plug-in spiral heterogeneous series H-type filter mainly used has a large resonance cavity volume, so that it can achieve the attenuation effect of hydraulic pulsation in the hydraulic system; but in actual use, when the pressure oil enters the resonance cavity through the conical damping hole, it is easy to have local oil retention, which cannot be circulated and discharged in time, resulting in heat accumulation and causing system overheating. At the same time, the retained oil is easy to accumulate pollutants, clogging the filter, affecting the cleanliness and reliability of the system; and its structure is fixed, and its adaptability to different working conditions is poor, resulting in poor performance in different working environments.

[0003] Therefore, it is necessary to provide a hydraulic system pressure pulse suppression device to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solution: a hydraulic system pressure pulse suppression device, comprising:

[0005] A housing having a central cavity therein, wherein two sides of the central cavity are respectively provided with an oil inlet and an oil outlet;

[0006] An input pipe is arranged outside the oil inlet, and is used to deliver hydraulic oil into the central cavity. An output pipe is arranged at the oil outlet;

[0007] An outer tube seat is installed on the shell at one side of the oil inlet, one end of the input pipe is fixed to the outer tube seat, a straight tube is fixed in the center of the outer tube seat, one end of the straight tube is extended into and connected to the input pipe, and the other end thereof is extended into and connected to the central cavity;

[0008] A vibration-absorbing pipe is coaxially arranged in the central cavity, one end of the vibration-absorbing pipe is sleeved with the straight pipe, the vibration-absorbing pipe forms a straight flow channel of the hydraulic oil in the central cavity, and the outer wall of the vibration-absorbing pipe and the inner wall of the central cavity are combined to form a circulation channel of the hydraulic oil;

[0009] A sealing seat is fixed on the housing at one side of the oil outlet, and one end of the output pipe is fixed to the sealing seat;

[0010] Bypass ports are arranged in a circular array on one end of the straight pipe close to the vibration absorbing pipe, an outer hole is provided on the side wall of the vibration absorbing pipe, and the bypass ports are connected to the outer hole;

[0011] A transfer unit is coaxially installed between the outer tube seat and the shell, the transfer unit is connected to the vibration-absorbing tube and is used to provide steering adjustment power to the vibration-absorbing tube. The transfer unit adjusts the vibration-absorbing tube adaptively based on the working conditions of the hydraulic system, so that two different oil delivery forms are formed in the central cavity, with the direct flow channel as the main flow channel or the circulating flow channel as the main flow channel;

[0012] A plurality of rifling grooves are distributed circumferentially on the inner wall of the central cavity, each of which is spiral in shape and rotates a quarter of a circle; a convex edge plate is parallelly provided on the inner wall of the central cavity at each rifling groove.

[0013] Furthermore, preferably, the rifling in the central cavity is divided into two sections, and one of the sections of the rifling located at the outer hole of the vibration-absorbing tube is in a straight line structure.

[0014] Further, as a preference, a plurality of guide holes are equidistantly provided on the circumference of the side wall of the vibration-absorbing tube, a spring-supported diaphragm is provided in each of the guide holes, and a damping hole is provided in the middle of the spring-supported diaphragm;

[0015] Balance bodies are fixed to both side end surfaces of the elastic support membrane plate, and the damping hole runs through the middle of the two balance bodies.

[0016] Further, as a preference, the cross-sectional shape of the internal channel of the sealing seat is an isosceles trapezoidal structure, and the length of one side close to the output pipe is smaller than the length of the other side;

[0017] One end of the vibration-absorbing pipe close to the sealing seat is configured as a conical cylinder structure.

[0018] Further, as a preference, the inner opening and outer opening of each damping hole in the middle of the vibration-absorbing tube are the same size;

[0019] The inner openings of the damping holes at the end of the vibration-absorbing tube are different from the outer openings, and the inner openings of the damping holes close to the straight tube are smaller than the outer openings; the inner openings of the damping holes close to the sealing seat are larger than the outer openings.

[0020] Furthermore, preferably, a plurality of installation cavities are symmetrically arranged in the side wall of the shell, and the inner wall of the central cavity is arranged as a thin-walled structure at the installation cavity; and the installation cavity is filled with porous silica gel, and a water supply hole is vertically connected to the outside of the installation cavity, and the water supply hole is used to transport clean water to the installation cavity.

[0021] Further, preferably, the transposition unit comprises:

[0022] A ring seat is coaxially fixed on the housing, wherein the ring seat and the housing cooperate to form an inner mounting groove, and a shaft ring is rotatably connected in the mounting groove;

[0023] a fixed rod circumferentially fixed to the collar;

[0024] A sliding sleeve is coaxially slidably connected to the vibration-absorbing tube, and the other end of the fixing rod is fixed to the sliding sleeve;

[0025] A compression spring connected between the vibration absorbing tube and the straight tube;

[0026] A double-headed gear is rotatably connected in the ring seat, and one end of the double-headed gear is meshed with the shaft ring for transmission; a rotating sleeve is rotatably connected to the outer tube seat, and a tooth groove is provided in the rotating sleeve, and the other end of the double-headed gear is meshed with the tooth groove for transmission.

[0027] Further, preferably, one end of the vibration-absorbing tube is threadedly connected to the straight tube, and the sliding sleeve synchronously controls the vibration-absorbing tube to rotate under positive and negative deflections. At this time, the vibration-absorbing tube is correspondingly displaced along the axial direction of the straight tube through the threaded connection.

[0028] Further, preferably, a blocking shaft is fixed to one end of the vibration-absorbing tube close to the outer hole, the blocking shaft is configured as a teardrop-shaped structure, and the end of the straight tube is provided with a reducing opening matched with the blocking shaft.

[0029] Furthermore, preferably, when the vibration-absorbing pipe slides toward the straight pipe, the docking area between the bypass port and the outer hole gradually expands, and at this time, the effective area of ​​the variable-diameter opening at the end of the straight pipe and the blocking shaft gradually decreases.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the present invention, a vibration-absorbing tube is mainly used in the shell, so that it can cooperate with the shell to form a circulation channel and a direct current channel. When a pulse occurs in the hydraulic system, the vibration-absorbing tube can absorb a part of the pulse energy through elastic deformation of a plurality of diaphragm plates arranged on its surface, thereby reducing the pulse intensity. A throttling effect can also be generated through the damping holes on the surface of the vibration-absorbing tube, thereby increasing the flow resistance of the liquid and further consuming the pulse energy. The rifling arranged in the shell can assist the hydraulic oil in the circulation channel, keep the circulation channel clean, and avoid the accumulation of impurities and pollutants. The adjustment unit also arranged therein can adaptively adjust the vibration-absorbing tube so that it adopts the circulation channel or the direct current channel as the main flow channel to form two different oil delivery forms, thereby adapting to different hydraulic working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a complete structural schematic diagram of the present invention;

[0033] Figure 2 is a cross-sectional view of the present invention;

[0034] Figure 3 It is a schematic diagram of a half-section structure of a shell in the present invention;

[0035] Figure 4 It is a schematic diagram of the cross-sectional structure of the rifling and the convex edge plate of the present invention;

[0036] Figure 5 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0037] Figure 6 It is a structural schematic diagram of the damping hole in the present invention;

[0038] Figure 7 It is a structural schematic diagram of the transfer unit in the present invention;

[0039] In the figure: 1. shell; 11. input pipe; 12. output pipe; 13. outer tube seat; 14. sealing seat; 15. rifling; 16. convex edge plate; 17. installation cavity; 18. porous silica gel; 2. straight pipe; 21. bypass port; 3. vibration damping pipe; 31. outer hole; 32. guide hole; 33. elastic support diaphragm; 34. damping hole; 341. inner hole opening; 342. outer hole opening; 35. balance body; 36. resistance shaft; 4. adjustment unit; 41. ring seat; 42. installation groove; 43. shaft ring; 44. fixing rod; 45. sliding sleeve; 46. double-headed gear; 47. rotating sleeve; 48. tooth groove. DETAILED DESCRIPTION

[0040] See also Figure 1-Figure 7 In an embodiment of the present invention, a hydraulic system pressure pulse suppression device comprises:

[0041] The housing 1 has a central cavity therein, and two sides of the central cavity are respectively provided as an oil inlet and an oil outlet;

[0042] An input pipe 11 is arranged outside the oil inlet, and the input pipe 11 is used to deliver hydraulic oil into the central cavity. An output pipe 12 is arranged at the oil outlet;

[0043] An outer tube seat 13 is installed on the shell at one side of the oil inlet, one end of the input pipe is fixed to the outer tube seat 13, a straight tube 2 is fixed in the center of the outer tube seat 13, one end of the straight tube 2 is extended into and connected to the input pipe 13, and the other end thereof is extended into and connected to the central cavity;

[0044] A vibration-absorbing pipe 3 is coaxially arranged in the central cavity, one end of which is sleeved with the straight pipe 2, and the vibration-absorbing pipe 3 forms a direct-flow channel for hydraulic oil in the central cavity, and the outer wall of the vibration-absorbing pipe 3 and the inner wall of the central cavity are combined to form a circulation channel for hydraulic oil; wherein the hydraulic oil can flow through the direct-flow channel and the circulation channel at the same time, which not only ensures the normal and rapid passage of the hydraulic oil and reduces the pressure loss, but also can timely provide the corresponding damping and vibration-absorbing effects; and the circulation channel and the direct-flow channel can both serve as resonance chambers, and the hydraulic oil can be discharged in time when entering, avoiding the retention of the hydraulic oil;

[0045] A sealing seat 14 is fixed on the housing 1 at one side of the oil outlet, and one end of the output pipe 12 is fixed to the sealing seat 14;

[0046] Bypass ports 21 are distributed in a circular array on one end of the straight pipe 2 close to the vibration absorbing pipe 3. An outer hole 31 is opened on the side wall of the vibration absorbing pipe 3. The bypass ports 21 are connected to the outer hole 31.

[0047] The transfer unit 4 is coaxially installed between the outer tube seat 13 and the shell 1. The transfer unit 4 is connected to the vibration-absorbing tube 3 and is used to provide steering adjustment power for the vibration-absorbing tube 3. The transfer unit 4 adaptively adjusts the vibration-absorbing tube 3 based on the working condition of the hydraulic system, so that two different oil delivery forms with the direct current channel as the main channel or the circulation channel as the main channel are formed in the central cavity; that is, the transfer unit 4 can adjust the flow ratio of the hydraulic oil in the circulation channel and the direct current channel, and the pulse characteristics of the hydraulic system in the high flow and low resistance working condition are high frequency and large amplitude. The transfer unit 4 controls to increase the flow ratio of the hydraulic oil in the circulation channel, so that most of the hydraulic oil flows through the circulation channel. At this time, the direct current channel acts as a resonance cavity; and the pulse characteristics of the hydraulic system in the medium and low flow conditions are low frequency, moderate amplitude and long time. The transfer unit 4 controls to increase the flow ratio of the hydraulic oil in the direct current channel, so that most of the hydraulic oil flows through the direct current channel. At this time, the circulation channel acts as a resonance cavity, which reduces the energy loss of the hydraulic oil;

[0048] There are multiple riflings 15 distributed circumferentially on the inner wall of the central cavity, each of which is spiral in shape and rotates a quarter of a circle; a convex plate 16 is provided parallel to each rifling 15 on the inner wall of the central cavity, and the convex plate 16 can cooperate with the rifling 15 to guide the flow of the hydraulic oil in the circulation channel, so that the hydraulic oil in the circulation channel, and because the flow velocity of the fluid is slow under medium and low flow conditions, the laminar effect is more obvious, which is easy to generate vibration and noise, the convex plate 16 and the rifling 15 can effectively reduce these phenomena and improve the stability of the hydraulic system.

[0049] In this embodiment, the rifling 15 in the central cavity is divided into two sections, and one section of the rifling 15 located at the outer hole 31 of the vibration-absorbing tube 3 is in the shape of a straight structure, so that when the hydraulic oil passes through the outer hole into the circulation channel, it can flow along the rifling of the straight structure, thereby improving the flow efficiency of the hydraulic oil and preventing eddy currents caused by direct guidance of the spiral rifling.

[0050] As a preferred embodiment, a plurality of guide holes 32 are equidistantly provided on the circumference of the side wall of the vibration-absorbing tube 3, and a spring-supporting diaphragm 33 is provided in each of the guide holes 32. A damping hole 34 is provided in the middle of the spring-supporting diaphragm 33; the damping hole 34 can produce a throttling effect in the flow of hydraulic oil, increase the flow resistance of the liquid, thereby reducing the impact and improving the stability of the spring-supporting diaphragm 33;

[0051] Balance bodies 35 are fixed to both side end surfaces of the elastic support diaphragm 33 , and the damping hole 34 runs through the middle of the two balance bodies 35 .

[0052] In this embodiment, the cross-sectional shape of the internal channel of the sealing seat 14 is an isosceles trapezoidal structure, and the length of one side close to the output pipe 12 is shorter than the length of the other side;

[0053] One end of the vibration-absorbing pipe 3 close to the sealing seat 14 is configured as a conical cylinder structure, thereby providing a smooth transition area, facilitating the smooth merging of the hydraulic oil in the direct-flow channel with the hydraulic oil in the circulating channel, and reducing energy loss.

[0054] In this embodiment, the inner opening 341 (towards the inside of the vibration-absorbing tube) and the outer opening 342 (towards the outside of the vibration-absorbing tube) of each damping hole 34 in the middle of the vibration-absorbing tube 3 are the same size;

[0055] The inner orifice 341 and the outer orifice 342 of each damping hole 34 at the end of the vibration-absorbing tube 3 are different in size, and the inner orifice 341 of each damping hole 34 close to the straight tube 2 is smaller than the outer orifice 342; the inner orifice 341 of each damping hole 34 close to the sealing seat 14 is larger than the outer orifice 342, wherein, when one end of the damping hole is larger than the other end, the fluid flows from the larger end to the smaller end, and the flow velocity will increase due to the gradual decrease in the cross section, but the pressure loss will also increase accordingly;

[0056] Specifically, in high flow and low resistance conditions, the hydraulic oil takes the circulation channel as the main flow channel. In pulse suppression, the hydraulic oil can flow into the direct current channel through the middle of the vibration-absorbing tube 3 and the damping hole located on one side of the straight tube 2. At this time, on the one hand, the multiple damping holes can reduce the pulse intensity of the hydraulic oil and absorb part of the pulse energy. On the other hand, the damping holes guide the hydraulic oil in the circulation channel to flow radially into the direct current channel. At this time, the direct current channel acts as a resonance cavity to enhance the attenuation effect.

[0057] In medium and low flow conditions, the hydraulic oil uses the direct current channel as the main flow channel. In pulse suppression, the hydraulic oil can flow into the circulation channel through the middle part of the vibration damping tube 3 and the damping hole on one side of the sealing seat 14. At this time, the circulation channel serves as a resonance cavity, and the hydraulic oil is guided to flow along the rifling of the circulation channel, which more effectively absorbs low-amplitude, low-frequency pulse energy.

[0058] In this embodiment, a plurality of installation cavities 17 are symmetrically arranged in the side wall of the shell 1, and the inner wall of the central cavity is located at the installation cavity 17 and is arranged to be a thin-walled structure, which has a certain elastic deformation, so that corresponding contraction deformation occurs during a hydraulic pulse; and the installation cavity 17 is filled with porous silica gel 18, and the outside of the installation cavity 17 is vertically connected with a water supply hole, and the water supply hole is used to transport clean water to the installation cavity 17, and the clean water can play a cooling role, and can also help the porous silica gel 18 to better absorb and release pulse energy, thereby further improving the attenuation effect of the hydraulic oil pulse, especially in medium and low flow conditions, which can further improve the absorption of low-frequency and small-amplitude pulse energy and improve the stability of the hydraulic system.

[0059] As a preferred embodiment, the transposition unit 4 includes:

[0060] A ring seat 41 is coaxially fixed on the housing 1, and the ring seat 41 cooperates with the housing 1 to form an inner mounting groove 42, and a shaft ring 43 is rotatably connected in the mounting groove 42;

[0061] A fixing rod 44, circumferentially fixed on the collar 43;

[0062] A sliding sleeve 45 is coaxially slidably connected to the vibration-absorbing tube 3, and the other end of the fixing rod 44 is fixed to the sliding sleeve 45;

[0063] A compression spring is connected between the vibration-absorbing pipe 3 and the straight pipe 2 to improve the tightness of the connection;

[0064] A double-headed gear 46 is rotatably connected in the ring seat 41, and one end of the double-headed gear 46 is meshed with the shaft ring 43 for transmission; a rotating sleeve 47 is rotatably connected to the outer tube seat 13, and a tooth groove 48 is provided in the rotating sleeve 47, and the other end of the double-headed gear 46 is meshed with the tooth groove 48 for transmission, wherein the rotating sleeve 47 can be manually adjusted by a wrench tool, and is convenient to use.

[0065] In this embodiment, one end of the vibration-absorbing tube 3 is threadedly connected to the straight tube 2, and the sliding sleeve 45 synchronously controls the vibration-absorbing tube 3 to rotate under positive and negative deflections. At this time, the vibration-absorbing tube 3 is correspondingly displaced along the axial direction of the straight tube 2 through the threaded connection.

[0066] In this embodiment, a blocking shaft 36 is fixed to one end of the vibration-absorbing tube 3 near the outer hole 31 . The blocking shaft 36 is configured as a teardrop-shaped structure, and a variable-diameter opening matching the blocking shaft 36 is provided at the end of the straight tube 2 .

[0067] In this embodiment, when the vibration-absorbing tube 3 slides toward the side of the straight tube 2, the docking area between the bypass port 21 and the outer hole 31 gradually expands. At this time, the effective area of ​​the variable-diameter port at the end of the straight tube 2 and the blocking shaft 36 gradually decreases, thereby effectively controlling the flow ratio of hydraulic oil in the circulation channel and the direct flow channel, so that it can adaptively adjust the hydraulic system under different working conditions.

[0068] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic system pressure pulse suppression device, characterized in that: It includes: A housing (1) is provided with a central cavity therein, and two sides of the central cavity are respectively provided with an oil inlet and an oil outlet; An input pipe (11) is arranged outside the oil inlet, and the input pipe (11) is used to deliver hydraulic oil into the central cavity. An output pipe (12) is arranged at the oil outlet; An outer tube seat (13) is mounted on the housing at one side of the oil inlet, one end of the input tube is fixed to the outer tube seat (13), a straight tube (2) is fixed in the center of the outer tube seat (13), one end of the straight tube (2) extends into and is connected to the input tube (13), and the other end of the straight tube (2) extends into and is connected to the central cavity; A vibration-absorbing pipe (3) is coaxially arranged in the central cavity, one end of the vibration-absorbing pipe (3) is sleeved with the straight pipe (2), the vibration-absorbing pipe (3) forms a direct flow channel for hydraulic oil in the central cavity, and the outer wall of the vibration-absorbing pipe (3) and the inner wall of the central cavity are combined to form a circulation channel for hydraulic oil; A sealing seat (14) is fixed on the housing (1) and is located on one side of the oil discharge port, and one end of the output pipe (12) is fixed to the sealing seat (14); Bypass ports (21) are distributed in a circular array on one end of the straight pipe (2) close to the vibration absorbing pipe (3), an outer hole (31) is opened on the side wall of the vibration absorbing pipe (3), and the bypass ports (21) are connected to the outer hole (31); A transfer unit (4) is coaxially mounted between the outer tube seat (13) and the housing (1); the transfer unit (4) is connected to the vibration-absorbing tube (3) and is used to provide steering adjustment power to the vibration-absorbing tube (3); the transfer unit (4) adaptively adjusts the vibration-absorbing tube (3) based on the working conditions of the hydraulic system, so that two different oil delivery forms are formed in the central cavity, with the direct flow channel as the main flow channel or the circulating flow channel as the main flow channel; A plurality of rifling grooves (15) are distributed circumferentially on the inner wall of the central cavity. Each of the rifling grooves (15) is spiral in shape and rotates a quarter of a circle. A convex edge plate (16) is provided in parallel at each rifling groove (15) on the inner wall of the central cavity.

2. A hydraulic system pressure pulse suppression device according to claim 1, characterized in that: The rifling (15) in the central cavity is divided into two sections, and one section of the rifling (15) located at the outer hole (31) of the vibration-absorbing tube (3) is in the shape of a straight line structure.

3. A hydraulic system pressure pulse suppression device according to claim 1, characterized in that: A plurality of guide holes (32) are equidistantly provided on the circumference of the side wall of the vibration-absorbing tube (3), a spring-supported membrane plate (33) is provided in each of the guide holes (32), and a damping hole (34) is provided in the middle of the spring-supported membrane plate (33); Balance bodies (35) are fixed to both side end surfaces of the elastic support membrane plate (33), and the damping hole (34) runs through the middle of the two balance bodies (35).

4. A hydraulic system pressure pulse suppression device according to claim 3, characterized in that: The cross-sectional shape of the internal channel of the sealing seat (14) is an isosceles trapezoidal structure, and the length of one side close to the output pipe (12) is shorter than the length of the other side; One end of the vibration absorbing pipe (3) close to the sealing seat (14) is configured as a conical cylinder structure.

5. A hydraulic system pressure pulse suppression device according to claim 3, characterized in that: The inner opening (341) and the outer opening (342) of each damping hole (34) in the middle of the vibration absorbing tube (3) are of the same size; The inner opening (341) and the outer opening (342) of each damping hole (34) at the end of the vibration-absorbing tube (3) are different in size, and the inner opening (341) of each damping hole (34) close to the straight tube (2) is smaller than the outer opening (342); and the inner opening (341) of each damping hole (34) close to the sealing seat (14) is larger than the outer opening (342).

6. The hydraulic system pressure pulse suppression device according to claim 1, characterized in that: A plurality of installation cavities (17) are symmetrically arranged in the side wall of the shell (1); the inner wall of the central cavity is located at the installation cavity (17) and is arranged as a thin-walled structure; the installation cavity (17) is filled with porous silica gel (18); and the outside of the installation cavity (17) is vertically connected with a water supply hole, and the water supply hole is used to transport clean water to the installation cavity (17).

7. The hydraulic system pressure pulse suppression device according to claim 1, characterized in that: The transposition unit (4) comprises: A ring seat (41) is coaxially fixed on the housing (1), the ring seat (41) and the housing (1) cooperate to form an inner mounting groove (42), and a shaft ring (43) is rotatably connected in the mounting groove (42); A fixing rod (44) circumferentially fixed on the collar (43); A sliding sleeve (45) is coaxially slidably connected to the vibration-absorbing tube (3), and the other end of the fixing rod (44) is fixed to the sliding sleeve (45); A compression spring connected between the vibration absorbing tube (3) and the straight tube (2); A double-headed gear (46) is rotatably connected in the ring seat (41), and one end of the double-headed gear (46) is meshed with the shaft ring (43) for transmission; a rotating sleeve (47) is rotatably connected to the outer tube seat (13), and a tooth groove (48) is provided in the rotating sleeve (47), and the other end of the double-headed gear (46) is meshed with the tooth groove (48) for transmission.

8. A hydraulic system pressure pulse suppression device according to claim 7, characterized in that: One end of the vibration-absorbing tube (3) is threadedly connected to the straight tube (2), and the sliding sleeve (45) synchronously controls the vibration-absorbing tube (3) to rotate under positive and negative deflections. At this time, the vibration-absorbing tube (3) is correspondingly displaced along the axial direction of the straight tube (2) through the threaded connection.

9. A hydraulic system pressure pulse suppression device according to claim 8, characterized in that: A blocking shaft (36) is fixed to one end of the vibration-absorbing tube (3) close to the outer hole (31); the blocking shaft (36) is configured as a water drop-shaped structure, and a diameter-changing opening matching the blocking shaft (36) is provided at the end of the straight tube (2).

10. A hydraulic system pressure pulse suppression device according to claim 9, characterized in that: When the vibration-absorbing tube (3) slides toward the side of the straight tube (2), the butt joint area between the bypass port (21) and the outer hole (31) gradually expands, and at this time, the effective area of ​​the variable diameter opening at the end of the straight tube (2) and the blocking shaft (36) gradually decreases.

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