Pressure pulsation attenuator of high-pressure low-flow hydraulic system

Abstract

The invention discloses a pressure pulsation attenuator of a high-pressure low-flow hydraulic system. The pressure pulsation attenuator comprises a top cover structure, a piston structure, an end cover and a three-way connector body. The top cover structure is fixedly installed at one end of the end cover, the other end of the end cover is in threaded connection with one end of the three-way connector body, the piston structure is arranged in a cavity formed between the end cover and the three-way connector body, and the other two ends of the three-way connector body are in threaded connection with the high-pressure oil inlet pipe and the high-pressure oil outlet pipe respectively. The pressure pulsation attenuator is compact in structure, small in size, modularized, convenient to install, very suitable for being applied to a high-pressure and low-flow small hydraulic system, convenient to install and detach, convenient to maintain and replace the belleville spring and the sealing assembly, capable of adjusting the arrangement mode and model of the belleville spring according to hydraulic systems with different working pressures and flows, and capable of improving the working efficiency. Therefore, the pressure pulsation attenuation effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic systems, and in particular relates to a pressure pulsation attenuator for a high-pressure and low-flow hydraulic system. Background Art

[0002] When deeply discussing the operation of hydraulic systems, the phenomenon of flow and pressure pulsation becomes a technical challenge that cannot be ignored. Flow and pressure pulsation pose a serious threat to precision mechanical equipment, accelerate component wear, and reduce the overall reliability and stability of the system. The pulsation energy and the fluid-solid coupling of the hydraulic pipeline may also cause pipeline vibration, noise pollution, and even fatigue fracture.

[0003] The generation of flow pulsation and pressure pulsation is mainly attributed to two aspects: first, the design characteristics of the pump source, such as the inherent flow unevenness of plunger pumps and gear pumps during operation, directly lead to the generation of flow pulsation; secondly, sudden changes in system operating conditions, such as rapid switching of hydraulic valves and sudden changes in loads, can also induce flow pulsation, which is then converted into pressure pulsation through fluid dynamics effects.

[0004] In order to solve the above technical problems, two strategies are currently adopted: one is to improve the stability of the output flow by optimizing the pump source design; the other is to integrate a pulsation attenuation device into the hydraulic system to weaken the impact of pulsation. However, with the development trend of hydraulic systems towards high pressure and miniaturization, the pressure pulsation problem of hydraulic pumps has become increasingly prominent, especially in small, high-pressure, low-flow systems with compact space, and the application of traditional pulsation attenuators is severely limited. Summary of the invention

[0005] In view of the problems in the background technology, it is imperative to develop a pulsation attenuation device with compact structure, small size, stable and reliable performance. The present invention provides a pressure pulsation attenuator for a high-pressure and low-flow hydraulic system, which is characterized by good attenuation performance, compact structure, small size, strong versatility and easy installation. The successful application of the pressure pulsation attenuator of the present invention will be able to effectively suppress the pressure pulsation in the hydraulic system, which has far-reaching and significant significance for protecting hydraulic equipment and improving system reliability, and is a key link in promoting the technological advancement of hydraulic systems.

[0006] The specific technical solutions adopted by the present invention are as follows:

[0007] The pressure pulsation attenuator of the high-pressure and low-flow hydraulic system of the present invention comprises:

[0008] A top cover structure, a piston structure, an end cover and a three-way joint body; the top cover structure is fixedly mounted on one end of the end cover, the other end of the end cover is threadedly connected to one end of the three-way joint body, the piston structure is arranged inside a cavity formed between the end cover and the three-way joint body, and the other two ends of the three-way joint body are threadedly connected to a high-pressure oil inlet pipe and a high-pressure oil outlet pipe, respectively.

[0009] The top cover structure includes an annular filter, a top cover and screws; the screws are arranged in the middle of the top cover and fix the top cover on one end of the end cover, and the annular filter is arranged between the end cover and the top cover and is fixedly installed on one end of the end cover by the top cover.

[0010] The bottom outer wall of one end of the end cover that is threadedly connected to the tee joint body is set as an outer hexagonal block; a three-section stepped groove is opened inside the end cover, and the inner diameter of the three-section stepped groove decreases successively in the direction away from the tee joint body and are respectively a connecting groove, a cavity and a guide groove, and the inner surface of the connecting groove is arranged with an internal thread, and the internal thread is threadedly connected to one end of the tee joint body, and the cavity, the guide groove and the piston structure are gap-matched, and a plurality of air vents are opened on the step surface between the cavity and the guide groove, one end of the air vent is connected to the cavity, and the other end of the air vent is connected to the outside air; a plurality of grooves are opened on the end surface of one end of the end cover close to the top cover structure, and the plurality of grooves are used to connect with the annular filter screen of the top cover structure.

[0011] The outer surface of one end of the three-way joint body is arranged with an external thread threadedly connected to the internal thread of the end cover; a piston cavity is opened inside one end of the three-way joint body, and the cavity formed by the piston cavity, the cavity and the guide groove is gap-matched with the piston structure.

[0012] The end of the three-way joint body connected to the end cover is connected to the middle part between the other two ends through a small hole arranged inside the three-way joint body, and the aperture of the small hole is smaller than the aperture of the connected middle part.

[0013] The piston structure includes a piston rod, a disc spring, an O-ring and two retaining rings; the piston rod is divided into a bare rod section and a piston section, the piston section is in the shape of an "I" character, and a piston groove is formed in the middle, and the disc spring is coaxially sleeved on the outer periphery of the bare rod section of the piston rod; the O-ring and the two retaining rings are coaxially sleeved on the outer periphery of the piston groove of the piston section, and the two retaining rings are arranged on both sides of the O-ring, and the O-ring, the two retaining rings and the piston section form a whole that is sealed and connected to the piston cavity of the three-way joint body.

[0014] The pressure pulsation attenuator also includes a cylindrical ledge; one end of the guide groove close to the top cover structure is fixedly connected to the cylindrical ledge, the height of the cylindrical ledge is lower than the height of the annular filter, and a fixed threaded hole is opened inside the cylindrical ledge, and the fixed threaded hole is used for threaded connection with the screws of the top cover structure.

[0015] The pressure pulsation attenuation method of the pressure pulsation attenuator of the present invention comprises:

[0016] The high-pressure oil inlet pipe and the high-pressure oil outlet pipe are respectively threadedly connected to the two threaded holes of the pressure pulsation attenuator;

[0017] In the working state, one end of the piston rod is subjected to the pulsating pressure of the fluid, and the disc spring is in a compressed state. At this time, the pulsating pressure of the fluid in the high-pressure oil pipe is the working pressure;

[0018] When the pulsating pressure of the fluid in the high-pressure oil pipe is lower than the working pressure, the piston rod moves toward the small hole under the action of the spring force of the disc spring, the cavity and guide groove of the end cover absorb the external air through a number of vents, and the piston section of the piston rod squeezes and reduces the volume of the fluid in the piston cavity to increase the pulsating pressure of the fluid; the reverse wave generated by the deformation of the disc spring and the resonance of the fluid in the high-pressure oil pipe attenuates the pulsating pressure within a specific frequency band;

[0019] When the pulsating pressure of the fluid in the high-pressure oil pipe is equal to the working pressure, the piston rod remains stationary;

[0020] When the pulsating pressure of the fluid in the high-pressure oil pipe is higher than the working pressure, the pulsating pressure of the fluid is transmitted to the piston cavity through the small hole, thereby pushing the piston rod to move in the direction close to the guide groove and compressing the disc spring, squeezing the air in the cavity of the end cover and the inside of the guide groove to be discharged to the outside through several vents to reduce the pulsating pressure of the fluid; the reverse wave generated by the deformation of the disc spring and the resonance of the fluid in the high-pressure oil pipe attenuates the pulsating pressure within a specific frequency band.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The pressure pulsation attenuator of the present invention has a compact structure, small size, modularization, and convenient installation, and is very suitable for use in small hydraulic systems with high pressure and low flow.

[0023] 2. The pressure pulsation attenuator of the present invention is easy to install and disassemble, and is convenient for repairing and replacing disc springs and sealing components. The arrangement and model of disc springs can be adjusted for hydraulic systems with different working pressures and flows, thereby improving the pressure pulsation attenuation effect.

[0024] 3. For small hydraulic systems with low flow, the pressure pulsation attenuator of the present invention mainly attenuates medium and low frequency pressure pulsations by converting pulsation energy into potential energy of the spring; it attenuates high frequency pressure pulsations by resonance, which can effectively reduce pressure pulsations and flow pulsations in the pipeline.

[0025] 4. The main structure of the pressure pulsation attenuator of the present invention is in the form of a three-way joint, which has a small pressure loss on the pipeline fluid and will not induce new pulsation in the process of reducing pulsation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the end cover structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the piston rod structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the three-way connector of the present invention;

[0030] Figure 5 It is a schematic diagram of the installation method of the present invention.

[0031] In the figure: 1. annular filter; 2. end cover; 2-1. guide groove; 2-2. vent hole; 2-3. cavity; 2-4. internal thread; 2-5. external hexagonal block; 2-6. cylindrical lever; 2-7. groove; 3. disc spring; 4. piston rod; 4-1. bare rod section; 4-2. piston section; 4-3. piston groove; 5. retaining ring; 6. O-ring; 7. screw; 8. top cover; 9. three-way joint body; 9-1. piston cavity; 9-2. small hole; 9-3. threaded hole; 9-4. bare hole; 9-5. external thread; 10. high-pressure oil inlet pipe; 11. pressure pulsation attenuator; 12. high-pressure oil outlet pipe. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings, so that those skilled in the art can understand the present invention. The described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 and Figure 5As shown, the pressure pulsation attenuator 11 of the high-pressure and low-flow hydraulic system of the present invention includes a top cover structure, a piston structure, an end cover 2 and a three-way joint body 9; the top cover structure is fixedly installed on one end of the end cover 2, and the other end of the end cover 2 is threadedly connected to one end of the three-way joint body 9, the piston structure is arranged inside a common cavity formed between the end cover 2 and the three-way joint body 9, and the other two ends of the three-way joint body 9 are threadedly connected to the high-pressure oil inlet pipe 10 and the high-pressure oil outlet pipe 12 respectively.

[0034] like Figure 2 As shown, the top cover structure includes an annular filter screen 1, a top cover 8 and screws 7; the screws 7 are arranged in the middle of the top cover 8 and fix the top cover 8 to one end of the end cover 2, and the annular filter screen 1 is arranged between the end cover 2 and the top cover 8 and is pressed and fixed to one end of the end cover 2 by the top cover 8.

[0035] The bottom outer wall of one end of the end cover 2 threadedly connected to the tee joint body 9 is set as an outer hexagonal block 2-5; a three-section stepped groove is opened inside the end cover 2, and the inner diameter of the three-section stepped groove decreases successively in the direction away from the tee joint body 9 and is respectively a connecting groove, a cavity 2-3 and a guide groove 2-1, and the inner surface of the connecting groove is arranged with an internal thread 2-4, and the internal thread 2-4 is threadedly connected to one end of the tee joint body 9, and the cavity 2-3 and the guide groove 2-1 are matched with the piston structure clearance, and a plurality of air holes 2-2 are opened on the step surface between the cavity 2-3 and the guide groove 2-1, and one end of the air hole 2-2 is connected to the cavity 2-3, and the other end of the air hole 2-2 is connected to the outside air; a plurality of grooves 2-7 are opened on the end surface of one end of the end cover 2 close to the top cover structure, and the plurality of grooves 2-7 are used for fixed connection with the annular filter screen 1 of the top cover structure.

[0036] like Figure 4 As shown, the outer surface of one end of the three-way joint body 9 is arranged with an external thread 9-5 threadedly connected to the internal thread 2-4 of the end cover 2; a piston cavity 9-1 is opened inside one end of the three-way joint body 9, and the common cavity formed by the piston cavity 9-1, the cavity 2-3 and the guide groove 2-1 is matched with the piston structure clearance.

[0037] The end of the three-way joint body 9 connected to the end cover 2 is connected to the middle part between the other two ends through a small hole 9-2 set inside the three-way joint body 9, and the aperture of the small hole 9-2 is smaller than the diameter of the light hole 9-4.

[0038] The other two ends of the three-way joint body 9 are provided with threaded holes 9-3, and one end of the two threaded holes 9-3 is threadedly connected to the high-pressure oil inlet pipe 10 and the high-pressure oil outlet pipe 12 respectively; the three-way joint body 9 is also provided with a light hole 9-4 and a small hole 9-2, and the two ends of the light hole 9-4 are connected to the other ends of the two threaded holes 9-3 respectively, one end of the small hole 9-2 is connected to the piston chamber 9-1, and the other end of the small hole 9-2 is connected to the middle part of the light hole 9-4.

[0039] The general installation position of the three-way joint body 9 can be selected between the high-pressure oil outlet of the hydraulic pump and the actuator.

[0040] The piston structure includes a piston rod 4, a disc spring 3, an O-ring 6 and two retaining rings 5; Figure 3 As shown, the piston rod 4 is divided into a bare rod section 4-1 and a piston section 4-2. The piston section 4-2 is in the shape of an I-shaped letter "I", with a piston groove 4-3 formed in the middle. The disc spring 3 is coaxially sleeved on the outer periphery of the bare rod section 4-1 of the piston rod 4; the O-ring 6 and two retaining rings 5 ​​are coaxially sleeved on the outer periphery of the piston groove 4-3 of the piston section 4, and the two retaining rings 5 ​​are arranged on both sides of the O-ring 6. The whole formed by the O-ring 6, the two retaining rings 5 ​​and the piston section 4-2 is sealed and connected to the piston cavity 9-1 of the three-way joint body 9.

[0041] The pressure pulsation attenuator 11 also includes a cylindrical sling 2-6; one end of the guide groove 2-1 close to the top cover structure is welded and fixedly connected to the cylindrical sling 2-6, and the welding height of the cylindrical sling 2-6 is slightly lower than the height of the annular filter 1. A fixed threaded hole is opened inside the cylindrical sling 2-6, and the fixed threaded hole is used for threaded connection with the screw 7 of the top cover structure.

[0042] After the pressure pulsation attenuator 11 is installed, the disc spring 3 cannot be in a squeezed state, that is, there must be a certain gap between one end of the disc spring 3 away from the piston section 4-2 and one end surface of the cavity 2-3 away from the piston section 4-2.

[0043] The pressure pulsation attenuation method used by the pressure pulsation attenuator 11 of the present invention in the specific implementation is as follows:

[0044] The high-pressure oil inlet pipe 10 and the high-pressure oil outlet pipe 11 are respectively threadedly connected to the two threaded holes 9-3 of the pressure pulsation attenuator 11;

[0045] In the working state, one end of the piston rod 4 is subjected to the pulsating pressure of the fluid, and the disc spring 3 is in a compressed state. At this time, the pulsating pressure of the fluid in the high-pressure oil pipe is the working pressure.

[0046] When the pulsating pressure of the fluid in the high-pressure oil pipe is lower than the working pressure, the piston rod 4 moves toward the direction close to the small hole 9-2 under the action of the spring force of the disc spring 3, the cavity 2-3 and the guide groove 2-1 of the end cover 2 absorb the external air through a plurality of vent holes 2-2, and the piston section 4-2 of the piston rod 4 squeezes and reduces the volume of the fluid in the piston cavity 9-1 to increase the pulsating pressure of the fluid; the reverse wave generated by the deformation of the disc spring 3 and the resonance of the fluid in the high-pressure oil pipe attenuates the pulsating pressure within a specific frequency band;

[0047] When the pulsating pressure of the fluid in the high-pressure oil pipe is equal to the working pressure, the piston rod 4 remains stationary;

[0048] When the pulsating pressure of the fluid in the high-pressure oil pipe is higher than the working pressure, the pulsating pressure of the fluid is transmitted to the piston chamber 9-1 through the small hole 9-2, thereby pushing the piston rod 4 to move in the direction close to the guide groove 2-1 and compressing the disc spring 3, squeezing the air in the cavity 2-3 of the end cover 2 and the guide groove 2-1 to be discharged to the outside through a plurality of vents 2-2 to reduce the pulsating pressure of the fluid; the reverse wave generated by the deformation of the disc spring 3 and the resonance of the fluid in the high-pressure oil pipe attenuates the pulsating pressure within a specific frequency band.

[0049] When the working pressure is too high, so that the disc spring 3 is always in a flattened state, or when the working pressure pulsation is too low, so that the piston rod 4 is basically in a static state, the attenuation effect will be significantly reduced. To address this problem, the attenuation effect can be adjusted by changing the model or arrangement of the disc spring 3. To replace the disc spring 3 and the piston rod 4, it is only necessary to remove the screws 7, the top cover 8, the annular filter 1 and the end cover 2, which is simple to disassemble and easy to replace.

[0050] The main structure of the pressure pulsation attenuator 11 of the present invention is in the form of a three-way joint, which has a small pressure loss on the pipeline fluid (the pipeline has no twists and turns, the overall length is short, and the local pressure loss and loss along the way are small), and will not induce new pulsation in the process of reducing pulsation.

[0051] For small hydraulic systems with low flow rates, the pressure pulsation attenuator 11 of the present invention attenuates pressure pulsations through vibration absorption and resonance. Vibration absorption: When the pressure suddenly increases, the piston rod 4 is pushed to move in the direction close to the guide groove 2-1, and the volume of the fluid in the piston chamber 9-1 increases, absorbing the instantaneous increase in flow, thereby reducing the pressure; when the pressure suddenly decreases, the piston rod 4 moves in the direction close to the small hole 9-2 under the elastic force of the disc spring 3, and the volume of the fluid in the piston chamber 9-1 decreases, and a small amount of fluid is discharged from the piston chamber 9-1 to the high-pressure oil pipe, thereby increasing the pressure. For low-frequency pressure pulsations, the piston movement responds in time, and the vibration absorption effect is significant. For medium and high-frequency pressure pulsations, the response of the piston movement is relatively delayed, so the vibration absorption effect is reduced. Resonance: The reverse wave formed by the resonance of the fluid in the high-pressure oil pipe and the spring is used to attenuate the pulsation in a specific frequency band. The attenuation effect of the resonance effect is related to the frequency, and the attenuation effect of medium and high-frequency pressure pulsations is significant.

[0052] The pressure pulsation attenuator 11 of the present invention mainly attenuates medium and low frequency pressure pulsations by converting pulsation energy into potential energy of a spring; and attenuates high frequency pressure pulsations by resonance, which can effectively reduce pressure pulsations and flow pulsations in the pipeline.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure pulsation attenuator for a high-pressure, low-flow hydraulic system, characterized in that: The invention comprises a top cover structure, a piston structure, an end cover (2) and a three-way joint body (9); the top cover structure is fixedly mounted on one end of the end cover (2), the other end of the end cover (2) is threadedly connected to one end of the three-way joint body (9), the piston structure is arranged inside a cavity formed between the end cover (2) and the three-way joint body (9), and the other two ends of the three-way joint body (9) are respectively threadedly connected to a high-pressure oil inlet pipe (10) and a high-pressure oil outlet pipe (12).

2. The pressure pulsation attenuator of a high-pressure and low-flow hydraulic system according to claim 1, characterized in that: The top cover structure comprises an annular filter screen (1), a top cover (8) and a screw (7); the screw (7) is arranged in the middle of the top cover (8) and fixes the top cover (8) to one end of the end cover (2); the annular filter screen (1) is arranged between the end cover (2) and the top cover (8) and is fixed to one end of the end cover (2) by the top cover (8).

3. The pressure pulsation attenuator of a high-pressure and low-flow hydraulic system according to claim 1, characterized in that: The bottom outer wall of one end of the end cover (2) threadedly connected to the tee joint body (9) is arranged as an outer hexagonal block (2-5); a three-stage stepped groove is provided inside the end cover (2); the inner diameter of the three-stage stepped groove decreases in sequence in a direction away from the tee joint body (9) and comprises a connecting groove, a cavity (2-3) and a guide groove (2-1); an inner surface of the connecting groove is arranged with an internal thread (2-4); the internal thread (2-4) is threadedly connected to one end of the tee joint body (9); the cavity (2-3) is provided with a guide groove (2-1) and a guide groove (2-2) is provided with a guide groove (2-3). 3) The guide groove (2-1) is clearance-matched with the piston structure; a plurality of vent holes (2-2) are provided on the step surface between the cavity (2-3) and the guide groove (2-1); one end of the vent hole (2-2) is connected to the cavity (2-3); and the other end of the vent hole (2-2) is connected to the outside air; a plurality of grooves (2-7) are provided on the end surface of one end of the end cover (2) close to the top cover structure; and the plurality of grooves (2-7) are used to be connected to the annular filter screen (1) of the top cover structure.

4. The pressure pulsation attenuator of a high-pressure and low-flow hydraulic system according to claim 3, characterized in that: The outer surface of one end of the three-way joint body (9) is provided with an external thread (9-5) threadedly connected to the internal thread (2-4) of the end cover (2); a piston cavity (9-1) is provided inside one end of the three-way joint body (9); the cavity formed by the piston cavity (9-1), the cavity (2-3) and the guide groove (2-1) is clearance-matched with the piston structure; The end of the three-way joint body (9) connected to the end cover (2) is connected to the middle part between the other two ends through a small hole (9-2) arranged inside the three-way joint body (9), and the hole diameter of the small hole (9-2) is smaller than the hole diameter of the connected middle part.

5. The pressure pulsation attenuator of a high-pressure and low-flow hydraulic system according to claim 4, characterized in that: The piston structure comprises a piston rod (4), a disc spring (3), an O-ring (6) and two retaining rings (5); the piston rod (4) is divided into a bare rod section (4-1) and a piston section (4-2); the piston section (4-2) is in the shape of an I-shaped letter "I" with a piston groove (4-3) formed in the middle; the disc spring (3) is coaxially sleeved on the outer periphery of the bare rod section (4-1) of the piston rod (4); the O-ring (6) and the two retaining rings (5) are coaxially sleeved on the outer periphery of the piston groove (4-3) of the piston section (4); the two retaining rings (5) are arranged on both sides of the O-ring (6); the whole formed by the O-ring (6), the two retaining rings (5) and the piston section (4-2) is sealed and connected to the piston chamber (9-1) of the three-way joint body (9).

6. The pressure pulsation attenuator of a high-pressure and low-flow hydraulic system according to claim 3, characterized in that: The pressure pulsation attenuator (11) further comprises a cylindrical saddle (2-6); one end of the guide groove (2-1) close to the top cover structure is fixedly connected to the cylindrical saddle (2-6); the height of the cylindrical saddle (2-6) is lower than the height of the annular filter (1); a fixed threaded hole is provided inside the cylindrical saddle (2-6); the fixed threaded hole is used for threaded connection with a screw (7) of the top cover structure.

7. The pressure pulsation attenuation method of the pressure pulsation attenuator according to any one of claims 1 to 6, characterized in that: include: The high-pressure oil inlet pipe (10) and the high-pressure oil outlet pipe (11) are respectively threadedly connected to the two threaded holes (9-3) of the pressure pulsation attenuator (11); In the working state, one end of the piston rod (4) is subjected to the pulsating pressure of the fluid, and the disc spring (3) is in a compressed state. At this time, the pulsating pressure of the fluid in the high-pressure oil pipe is the working pressure; When the pulsating pressure of the fluid in the high-pressure oil pipe is lower than the working pressure, the piston rod (4) moves toward the direction close to the small hole (9-2) under the action of the spring force of the disc spring (3), the cavity (2-3) and the guide groove (2-1) of the end cover (2) absorb external air through a plurality of vent holes (2-2), and the piston section (4-2) of the piston rod (4) squeezes and reduces the volume of the fluid in the piston cavity (9-1), thereby increasing the pulsating pressure of the fluid; When the pulsating pressure of the fluid in the high-pressure oil pipe is equal to the working pressure, the piston rod (4) remains stationary; When the pulsating pressure of the fluid in the high-pressure oil pipe is higher than the working pressure, the pulsating pressure of the fluid is transmitted to the piston chamber (9-1) through the small hole (9-2), thereby pushing the piston rod (4) to move in a direction close to the guide groove (2-1) and compressing the disc spring (3), squeezing the air in the cavity (2-3) of the end cover (2) and the guide groove (2-1) to be discharged to the outside through a plurality of vent holes (2-2), thereby reducing the pulsating pressure of the fluid.

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