A hydraulic system pressure pulse suppression device

Abstract

The present invention discloses a device for suppressing pressure pulses in a hydraulic system, which comprises: a housing having a central cavity therein, with both sides of the central cavity being respectively arranged as an oil inlet and an oil drain port; an input pipe disposed outside the oil inlet, the input pipe being used for feeding hydraulic oil into the central cavity, and an output pipe being provided at the oil drain port; an outer pipe seat mounted on the housing on one side of the oil inlet; a vibration damping pipe coaxially arranged in the central cavity; a sealing seat fixed on the housing on one side of the oil drain port; bypass ports circumferentially and arrayedly distributed at one end of the straight pipe close to the vibration damping pipe; a rotation adjustment unit coaxially installed between the outer pipe seat and the housing; in the present invention, the vibration damping pipe can cooperate with the housing to form a circulation channel and a direct current channel. During the suppression of pressure pulses in the hydraulic system, it can be adaptively adjusted, so as to adopt the circulation channel or the direct current channel as the main flow channel to form two different oil delivery forms and adapt to different hydraulic working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic equipment, and specifically relates to a hydraulic system pressure pulse suppression device. Background Art

[0002] Hydraulic systems can transmit large torques and are widely used in transmission systems. With the development of hydraulic technology towards high pressure, high speed, and large flow, the impact of inherent pressure pulsations in hydraulic systems has become increasingly prominent. Pressure pulsations are generated by flow pulsations through system impedance. In traditional technologies, a common method to eliminate pressure pulsations 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 the publication number CN105864156A, the mainly adopted plug-in spiral heterogeneous series H-type filter has a relatively large resonance cavity volume, thus being able to achieve the attenuation effect of hydraulic pulsations in the hydraulic system. However, in actual use, when the pressure oil enters the resonance cavity through the conical damping hole, there is an easy phenomenon of local oil retention, and it cannot be circulated and discharged in time, resulting in heat accumulation and then causing system overheating. At the same time, the retained oil is prone to accumulating pollutants, clogging the filter, affecting the cleanliness and reliability of the system. Moreover, its structure is fixed, and its adaptability to different working conditions is poor, resulting in poor performance under 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 art. Summary of the Invention

[0004] To achieve the above object, the invention provides the following technical solution: A hydraulic system pressure pulse suppression device, which includes:

[0005] A housing with a central cavity inside, and both sides of the central cavity are respectively set as an oil inlet and an oil outlet;

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

[0007] An outer pipe seat is installed on one side of the housing where the oil inlet is located. One end of the input pipe is fixed to the outer pipe seat. A straight pipe is fixedly centered inside the outer pipe seat. One end of the straight pipe extends into and is connected to the input pipe, and the other end extends into and is connected to the central cavity;

[0008] A vibration damping pipe is coaxially arranged inside the central cavity. One end of the vibration damping pipe is sleeved with the straight pipe. The vibration damping pipe forms a direct current channel for hydraulic oil in the central cavity, and the outer wall of the vibration damping pipe and the inner wall of the central cavity are combined with each other to form a circulating channel for 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] Furthermore, as a preference, the tone modulation unit includes:

[0022] A ring base, coaxially fixed on the housing, an inner installation groove is formed by the cooperation between the ring base and the housing, and a shaft ring is rotatably connected in the installation groove;

[0023] A fixing rod, circumferentially fixed on the shaft ring;

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

[0025] A compression spring, connected between the vibration damping pipe and the straight pipe;

[0026] A double-headed gear, rotatably connected in the ring base, one end of the double-headed gear is meshed and driven with the shaft ring; a rotating sleeve is rotatably connected on the outer pipe seat, a tooth groove is arranged in the rotating sleeve, and the other end of the double-headed gear is meshed and driven with the tooth groove.

[0027] Furthermore, as a preference, one end of the vibration damping pipe is threadedly connected to the straight pipe, and the sliding sleeve synchronously controls the rotation of the vibration damping pipe under positive and negative deflections. At this time, the vibration damping pipe axially displaces along the straight pipe through the action of the threaded connection.

[0028] Furthermore, as a preference, a blocking shaft is fixed at one end of the vibration damping pipe close to the outer hole, the blocking shaft is arranged in a water droplet shape, and a variable-diameter through port matching with the blocking shaft is arranged at the end of the straight pipe.

[0029] Furthermore, as a preference, when the vibration damping pipe slides towards the straight pipe side, the butt joint area between the bypass port and the outer hole gradually expands, and at this time, the effective area between the variable-diameter through port at the end of the straight pipe and the blocking shaft gradually shrinks.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] In the present invention, a vibration damping pipe is mainly adopted in the housing, so that a circulating flow channel and a direct current channel can be formed in cooperation with the housing. When a hydraulic system pulse occurs, the vibration damping pipe can absorb a part of the pulse energy through the elastic deformation of a plurality of support membranes arranged on its surface, reduce the pulse intensity, and a throttling effect can also be generated through the damping holes on the surface of the vibration damping pipe, increasing the flow resistance of the liquid and further consuming the pulse energy; the rifling arranged in the housing can assist the hydraulic oil in the circulating flow channel to keep the circulating flow channel clean and avoid the accumulation of impurities and pollutants; a tone modulation unit is also arranged therein, which can adaptively adjust the vibration damping pipe so that it uses the circulating flow channel or the direct current channel as the main flow channel to form two different oil delivery forms, so as to adapt to different hydraulic working conditions. Brief Description of the Drawings

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

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

[0034] Figure 3 is the semi-sectional structural schematic diagram of the housing in the present invention;

[0035] Figure 4 is the cross-sectional structural schematic diagram of the rifling and the flange plate in the present invention;

[0036] Figure 5 is Figure 2 the enlarged schematic diagram of the structure at position A in

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

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

[0039] In the figure: 1. Housing; 11. Input pipe; 12. Output pipe; 13. Outer pipe seat; 14. Sealing seat; 15. Rifling; 16. Flange 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. Spring support diaphragm; 34. Damping hole; 341. Inner hole opening; 342. Outer hole opening; 35. Balance body; 36. Damping shaft; 4. Transfer and adjustment unit; 41. Ring seat; 42. Installation groove; 43. Shaft collar; 44. Fixed rod; 45. Slide sleeve; 46. Double-headed gear; 47. Rotating sleeve; 48. Tooth groove. Detailed implementation manners

[0040] Please refer to Figures 1 - 7 , in the embodiment of the present invention, a hydraulic system pressure pulse suppression device includes:

[0041] Housing 1, with a central cavity inside, and both sides of the central cavity are respectively set as an oil inlet and an oil drain port;

[0042] Input pipe 11, arranged outside the oil inlet, the input pipe 11 is used to send hydraulic oil into the central cavity, and an output pipe 12 is arranged at the oil drain port;

[0043] Outer pipe seat 13, installed on one side of the housing at the oil inlet, one end of the input pipe is fixed to the outer pipe seat 13, a straight pipe 2 is fixedly installed in the center of the outer pipe seat 13, one end of the straight pipe 2 extends into and is connected to the input pipe 13, and the other end thereof extends into and is 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 position of the outer hole 31 of the vibration damping tube 3 has a linear structure. When hydraulic oil enters the circulation channel through the outer hole, it can be guided to flow along the rifling with a linear structure, improving the flow efficiency of the hydraulic oil and preventing eddy currents caused by direct guidance by spiral rifling.

[0050] As a preferred embodiment, a plurality of guide holes 32 are circumferentially and equidistantly formed on the side wall of the vibration damping tube 3, and a spring support diaphragm 33 is arranged in each guide hole 32. A damping hole 34 is formed in the middle of the spring support diaphragm 33; the damping hole 34 can generate a throttling effect during the flow of hydraulic oil, increasing the flow resistance of the liquid, thereby reducing the impact and improving the stability of the spring support diaphragm 33.

[0051] Balancing bodies 35 are fixed to both end faces of the spring support diaphragm 33, and the damping hole 34 penetrates through the middle of the two balancing bodies 35.

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

[0053] One end of the vibration damping tube 3 close to the sealing seat 14 is arranged as a conical tube structure, so as to provide a smooth transition area, facilitating the smooth convergence of the hydraulic oil in the direct current channel and the hydraulic oil in the circulation channel, and reducing energy loss.

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

[0055] The inner hole opening 341 and the outer hole opening 342 of each damping hole 34 at the end of the vibration damping tube 3 are of different sizes, and the inner hole opening 341 of each damping hole 34 close to the straight tube 2 is smaller than the outer hole opening 342; the inner hole opening 341 of each damping hole 34 close to the sealing seat 14 is larger than the outer hole opening 342. Among them, when one end of the damping hole is large and the other end is small, the fluid flows from the large end to the small end. Since the cross-section gradually decreases, the flow rate will increase, but the pressure loss will also increase accordingly.

[0056] Specifically, in the high-flow and low-resistance working 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 damping holes in the middle of the vibration damping tube 3 and on the side of the straight tube 2. At this time, on the one hand, a plurality of 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 radially flow into the direct current channel. At this time, the direct current channel serves as a resonance cavity, strengthening the attenuation effect.

[0057] In medium and low flow conditions, the hydraulic oil takes the direct current channel as the main flow channel. During pulse suppression, the hydraulic oil can flow through the middle of the vibration damping tube 3 and the damping holes on one side of the sealing seat 14 into the circulation channel. 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, more effectively absorbing the pulse energy with low amplitude and low frequency.

[0058] In this embodiment, a plurality of installation cavities 17 are symmetrically arranged in the side wall of the housing 1. The inner wall of the central cavity at the position of the installation cavity 17 is set as a thin-wall structure, which has a certain elastic deformation, so as to perform corresponding contraction deformation during hydraulic pulses; and the installation cavity 17 is filled with porous silica gel 18. Water replenishing holes are vertically communicated outside the installation cavity 17. The water replenishing holes are used to convey clean water to the installation cavity 17. The clean water can play a cooling role, and at the same time can also help the porous silica gel 18 better absorb and release pulse energy, further improving the hydraulic oil pulse attenuation effect. Especially in medium and low flow conditions, it can further improve the absorption of pulse energy with low frequency and small amplitude, and improve the stability of the hydraulic system.

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

[0060] A ring seat 41, coaxially fixed on the housing 1. An inner installation groove 42 is formed by the cooperation between the ring seat 41 and the housing 1. An axle ring 43 is rotatably connected in the installation groove 42;

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

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

[0063] A compression spring, connected between the vibration damping tube 3 and the straight tube 2 to improve the connection tightness;

[0064] A double-headed gear 46, rotatably connected in the ring seat 41. One end of the double-headed gear 46 is meshed and driven with the axle ring 43; a rotating sleeve 47 is rotatably connected on the outer pipe seat 13. A tooth groove 48 is arranged in the rotating sleeve 47. The other end of the double-headed gear 46 is meshed and driven with the tooth groove 48. Among them, the rotating sleeve 47 can be adjusted manually by a wrench tool, which is convenient to use.

[0065] In this embodiment, one end of the vibration damping tube 3 is threadedly connected to the straight tube 2. The sliding sleeve 45 synchronously controls the rotation of the vibration damping tube 3 under forward and reverse deflection. At this time, the vibration damping tube 3 axially displaces along the straight tube 2 due to the threaded connection effect.

[0066] In this embodiment, a damping shaft 36 is fixed at one end of the damping pipe 3 close to the outer hole 31. The damping shaft 36 is arranged in a water-drop shape, and a reduced-diameter through-port matching with the damping shaft 36 is provided at the end of the straight pipe 2.

[0067] In this embodiment, when the damping pipe 3 slides towards the straight pipe 2, the butt-joint area between the bypass port 21 and the outer hole 31 gradually expands. At this time, the effective area between the reduced-diameter through-port at the end of the straight pipe 2 and the damping shaft 36 gradually shrinks, so as to effectively control the flow ratio of the hydraulic oil in the circulation channel and the direct-current channel, so that it can adaptively adjust hydraulic systems under different working conditions.

[0068] 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 person skilled in the art within the technical scope disclosed by the present invention should cover equivalent replacements or changes made according to the technical solution and inventive concept of the present invention within 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 installed 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 (11), 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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