A two-way hydraulic damping valve group

Abstract

The present invention provides a two-way hydraulic damping valve group, belonging to the technical field of dampers, which includes a fixed valve core 6, a first guide sleeve 3 and a second guide sleeve 9 respectively and fixedly connected to both sides of the fixed valve core 6. The fixed valve core 6 is provided with a plurality of damping holes. The first guide sleeve 3 and the fixed valve core 6 form a first hydraulic chamber, and the second guide sleeve 9 and the fixed valve core 6 form a second hydraulic chamber. The first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil. A plurality of oil passage channels are provided between the first hydraulic chamber and the second hydraulic chamber. Blocking components are respectively arranged in the first hydraulic chamber and the second hydraulic chamber. When the positive pressure difference between one hydraulic chamber and the other hydraulic chamber exceeds a defined value, the blocking component on the high-pressure side can block all the oil passage channels, so that the hydraulic oil can only enter the low-pressure side hydraulic chamber through the damping holes on the fixed valve core 6, thereby realizing the two-way damping effect.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic dampers, and in particular to a bidirectional hydraulic damping valve group. Background Art

[0002] The various frictional and other obstacles that attenuate free vibration are called damping. Devices installed in structural systems to rapidly damp vibrations caused by impact are called dampers. Various dampers have long been used in industries such as aerospace, aviation, military, firearms, and automobiles to reduce vibration and dissipate energy. Since the 1970s, these technologies have been gradually applied to structural engineering projects such as buildings, bridges, and railways, and their development has been rapid.

[0003] Damper structures vary, including hydraulic dampers, solid viscous dampers, air dampers, and friction dampers. Hydraulic dampers, by using internal damping valves to throttle the flow of viscous fluids, provide excellent damping for cyclic and impact loads. They are widely used in nuclear power plants, thermal power plants, chemical plants, steel mills, and other locations to control vibrations in pipelines and equipment, as well as control shock-induced fluid vibrations and seismic-induced piping vibrations. Common hydraulic fluids used in hydraulic dampers include silicone oil, castor oil, machine oil, diesel, engine oil, and transformer oil. Hydraulic dampers must suppress abnormal vibration, sway, or rocking of pipelines or protected items under external impact loads. Some specialized equipment even requires full rigidity. They must also accommodate movement caused by allowable deformation of the pipeline or protected item (such as normal thermal expansion). To achieve these requirements, the damping valve assembly within the damper must be able to adapt to external loads.

[0004] Existing two-way damping valves generally use a combination of two sets of one-way valves and a damping valve to achieve a two-way damping effect. This requires multiple damping pathways, resulting in a large volume and complex structure. Chinese patent application number CN204942128U provides a two-way damping valve structure with a single damping pathway. However, this solution still requires two sets of damping components at both ends of the slidable valve core to achieve a two-way damping effect. Furthermore, during use, the entire valve core continuously collides with the left and right valve seats, resulting in low durability and an inability to quickly respond to impact loads. Furthermore, the damping channel cannot self-recover after the external load disappears. Furthermore, the slidable valve core and the left and right valve seats utilize conical surface seals, making manufacturing difficult and costly. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing two-way damping valve structure is large and complex, cannot achieve rapid response to impact loads, and cannot achieve self-recovery of the damping channel after the external load disappears. At the same time, it has low durability, great manufacturing difficulty and high cost.

[0006] To solve the above technical problems, the present invention provides a two-way hydraulic damping valve group, which includes a fixed valve core, and a first guide sleeve and a second guide sleeve respectively fixedly connected to both sides of the fixed valve core. The fixed valve core is provided with a plurality of damping holes. The first guide sleeve and the fixed valve core form a first hydraulic chamber, and the second guide sleeve and the fixed valve core form a second hydraulic chamber. The first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil. A plurality of oil passage channels are provided between the first hydraulic chamber and the second hydraulic chamber. A first blocking member is provided in the first hydraulic chamber. When the positive pressure difference between the first hydraulic chamber and the second hydraulic chamber exceeds a specified value, the first blocking member can block all the oil passage channels, so that the hydraulic oil can only enter the second hydraulic chamber through the damping holes on the fixed valve core; A second blocking member is provided in the second hydraulic chamber. When the positive pressure difference between the second hydraulic chamber and the first hydraulic chamber exceeds a specified value, the second blocking member can block all the oil passage channels, so that the hydraulic oil can only enter the first hydraulic chamber through the damping holes on the fixed valve core.

[0007] Further, the outer sides of the first guide sleeve and the second guide sleeve are tightly sleeved with a valve sleeve. A plurality of oil passage cavities are provided between the first guide sleeve and the second guide sleeve and the valve sleeve, and a plurality of oil passage holes corresponding to the channels are provided on the side walls of the first guide sleeve and the second guide sleeve. The oil passage cavities and the oil passage holes together form the oil passage channels.

[0008] Further, guide sleeve retaining rings are fixedly connected to both ends of the valve sleeve, and the material of the guide sleeve retaining rings is steel.

[0009] Further, the first blocking member includes a first movable valve core in the shape of a cylindrical barrel with a single-side opening, and a pressure reducing valve hole is provided on the closed end surface of the first movable valve core. The first movable valve core is inserted into the first guide sleeve with the opening side facing the fixed valve core. The first movable valve core can freely slide while keeping the outer wall in close contact with the inner wall of the first guide sleeve. When the first movable valve core approaches the fixed valve core, it can block the oil passage channels, and when the first movable valve core moves away from the fixed valve core, it can dredge the oil passage channels. A first spring is provided between the first movable valve core and the fixed valve core. One end of the first spring is supported on the inner side of the closed end surface of the first movable valve core, and the other end is supported on the side of the fixed valve core close to the first hydraulic chamber. A first limit sealing retaining ring is fixedly connected to the first guide sleeve away from the fixed valve core. Under normal conditions, the first spring presses the first movable valve core inside the first limit sealing retaining ring to keep the oil passage channels in a dredged state;

[0010] The second blocking component includes a second movable valve core in the shape of a cylindrical barrel with a single-side opening, and a pressure reducing valve hole is provided on the closed end surface of the second movable valve core. The second movable valve core is inserted into the second guide sleeve with the opening side facing the fixed valve core. The second movable valve core can freely slide while keeping the outer wall in close fit with the inner wall of the second guide sleeve. When the second movable valve core approaches the fixed valve core, it can block the oil passage, and when the second movable valve core moves away from the fixed valve core, it can dredge the oil passage. A second spring is provided between the second movable valve core and the fixed valve core. One end of the second spring is supported inside the closed end surface of the second movable valve core, and the other end is supported on the side of the fixed valve core close to the second hydraulic chamber. A second limit sealing retaining ring is fixedly connected to the second guide sleeve away from the fixed valve core. Under normal conditions, the second spring presses the second movable valve core inside the second limit sealing retaining ring to keep the oil passage in a dredged state.

[0011] Further, the first limit sealing retaining ring and the second limit sealing retaining ring are both made of copper.

[0012] Further, the pressure reducing valve holes on the closed end surface of the first movable valve core and the closed end surface of the second movable valve core can adopt different specifications.

[0013] Further, the first spring and the second spring adopt different mechanical property parameters.

[0014] Further, the fixed valve core is a completely sealed structure. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the internal structure of the present invention.

[0016] The meanings of the reference numerals in the figure are as follows: 1, the first limit sealing retaining ring; 2, the guide sleeve retaining ring; 3, the first guide sleeve; 4, the first movable valve core; 5, the first spring; 6, the fixed valve core; 7, the valve sleeve; 8, the second spring; 9, the second guide sleeve; 10, the second movable valve core; 11, the second limit sealing retaining ring. Detailed Embodiments

[0017] In order to better explain the present invention for easy understanding, the technical solutions and effects of the present invention will be described in detail below with reference to the drawings and through specific embodiments.

[0018] Such as Figure 1As shown in the figure, the present invention provides a two-way hydraulic damping valve group, which includes a fixed valve core 6, and a first guide sleeve 3 and a second guide sleeve 9 respectively fixedly connected to both sides of the fixed valve core 6. The fixed valve core 6 is provided with a number of damping holes. The first guide sleeve 3 and the fixed valve core 6 form a first hydraulic chamber, and the second guide sleeve 9 and the fixed valve core 6 form a second hydraulic chamber. The first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil. The outer sides of the first guide sleeve 3 and the second guide sleeve 9 are tightly sleeved with a valve sleeve 7. A number of oil passage chambers are provided between the first guide sleeve 3 and the second guide sleeve 9 and the valve sleeve 7, and a number of oil passage holes corresponding to the channels are provided on the side walls of the first guide sleeve 3 and the second guide sleeve 9. The oil passage chambers and the oil passage holes together form a number of oil passage channels, thereby realizing the connection between the first hydraulic chamber and the first hydraulic chamber.

[0019] Further, guide sleeve retaining rings 2 are fixedly connected to both ends of the valve sleeve 7, and the material of the guide sleeve retaining rings 2 is steel. The guide sleeve retaining rings 2 can assist in fixing the first guide sleeve 3 and the second guide sleeve 9 while improving the sealing performance of the oil passage chambers.

[0020] Further, a first blocking component is provided in the first hydraulic chamber. The first blocking component includes a first movable valve core 4 in the shape of a cylindrical barrel with a single-sided opening. A pressure reducing valve hole is provided on the closed end surface of the first movable valve core 4. The first movable valve core 4 is inserted into the first guide sleeve 3 with the opening side facing the fixed valve core 6. The first movable valve core 4 can freely slide while keeping the outer wall in close contact with the inner wall of the first guide sleeve 3. When the first movable valve core 4 approaches the fixed valve core 6, it can block the oil passage channels, and when the first movable valve core 4 moves away from the fixed valve core 6, it can dredge the oil passage channels. A first spring 5 is provided between the first movable valve core 4 and the fixed valve core 6. One end of the first spring 5 is supported on the inner side of the closed end surface of the first movable valve core 4, and the other end is supported on the side of the fixed valve core 6 close to the first hydraulic chamber. The first guide sleeve 3 is fixedly connected to a first limit sealing retaining ring 1 away from the fixed valve core 6. Under normal conditions, the first spring 5 presses the first movable valve core 4 inside the first limit sealing retaining ring 1 to keep the oil passage channels in a dredged state.

[0021] Furthermore, a second blocking component is provided in the second hydraulic chamber. The second blocking component includes a second movable valve core 10 in the shape of a cylindrical barrel with a single-side opening. A pressure reducing valve hole is provided on the closed end surface of the second movable valve core 10. The second movable valve core 10 is inserted into the second guide sleeve 9 with the opening side facing the fixed valve core 6. The second movable valve core 10 can slide freely while keeping the outer wall in close contact with the inner wall of the second guide sleeve 9. When the second movable valve core 10 approaches the fixed valve core 6, it can block the oil passage. When the second movable valve core 10 moves away from the fixed valve core 6, it can dredge the oil passage. A second spring 8 is provided between the second movable valve core 10 and the fixed valve core 6. One end of the second spring 8 is supported on the inner side of the closed end surface of the second movable valve core 10, and the other end is supported on the side of the fixed valve core 6 close to the second hydraulic chamber. The second guide sleeve 9 is fixedly connected with a second limit sealing retaining ring 11 away from the fixed valve core 6. Under normal conditions, the second spring 8 presses the second movable valve core 10 inside the second limit sealing retaining ring 11 to keep the oil passage in a dredged state.

[0022] When the hydraulic oil flow direction in the valve group is from the first hydraulic chamber to the second hydraulic chamber, the pressure in the first hydraulic chamber increases. If the positive pressure difference between the first hydraulic chamber and the second hydraulic chamber is within the designed allowable range value, the first movable valve core 4 remains stationary under the support of the first spring 5, that is, the oil passage remains in a dredged state, and the hydraulic oil flows from the first hydraulic chamber to the second hydraulic chamber at the designed allowable moving speed. If the positive pressure difference between the first hydraulic chamber and the second hydraulic chamber exceeds the designed allowable range value, the first movable valve core 4 moves towards the fixed valve core 6 under the push of the hydraulic oil, completely blocking the oil passage hole on the first guide sleeve 3, thereby closing the oil passage. At this time, the hydraulic oil can only slowly flow to the second hydraulic chamber through the damping hole on the fixed valve core 6, thereby realizing the damping effect on the direction from the first hydraulic chamber to the second hydraulic chamber. When the load on the hydraulic oil is removed or the pressure difference drops to the allowable range value after the damping effect of the damping hole, the first movable valve core 4 returns to the position where the oil passage hole on the first guide sleeve 3 is completely opened under the push of the first spring 5, realizing the self-recovery of the oil passage.

[0023] On the contrary, when the hydraulic oil in the valve group flows from the second hydraulic chamber to the first hydraulic chamber, the pressure in the second hydraulic chamber increases. If the positive pressure difference between the second hydraulic chamber and the first hydraulic chamber is within the design allowable range, the second movable valve core 10 remains stationary under the support of the second spring 8, that is, the oil passage remains unblocked, and the hydraulic oil flows from the second hydraulic chamber to the first hydraulic chamber at the design allowable moving speed; if the positive pressure difference between the second hydraulic chamber and the first hydraulic chamber exceeds the design allowable range, the second movable valve core 10 pushes the hydraulic oil into the first hydraulic chamber. The second movable valve core 10 is pushed by the first spring 8 to return to the position where the oil hole on the second guide sleeve 9 is fully opened, thereby realizing self-recovery of the oil passage.

[0024] Furthermore, the first position-limiting sealing ring 1 and the second position-limiting sealing ring 11 are both made of copper.

[0025] Furthermore, the diameter and number of the oil holes and the annular surface size of the oil cavity are set according to the viscosity parameters of the hydraulic oil and the flow rate requirements of the hydraulic oil.

[0026] Furthermore, the pressure reducing valve hole on the closed end face of the first movable valve core 4 and the pressure reducing valve hole on the closed end face of the second movable valve core can adopt different specifications, and the first spring 5 and the second spring 8 can adopt different mechanical performance parameters to meet the different requirements for the actual allowable pressure of the bidirectional hydraulic damping valve group in different directions.

[0027] Furthermore, the fixed valve core 6 is not provided with a damping hole and adopts a completely sealed structure to meet the requirement that some special equipment needs to adopt the hydraulic damper of the present invention to be completely rigid when subjected to impact loads. After the external load is removed, the movable valve core is pushed by the spring to return to the position where the oil hole is fully opened, thereby realizing self-recovery of the oil channel.

[0028] At the same time, the present invention is made of metal as a whole, and the moving mating surface is hardened, so it has good wear resistance, high precision and long service life; and the whole set of sealing valve group moves accurately and responds quickly; and the manufacturing process does not use conical surface sealing, which makes the manufacturing difficulty low.

[0029] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A two-way hydraulic damping valve group, comprising a fixed valve core (6), and a first guide sleeve (3) and a second guide sleeve (9) respectively and fixedly connected to both sides of the fixed valve core (6), and a plurality of damping holes are provided on the fixed valve core (6), characterized in that, The first guide sleeve (3) and the fixed spool valve (6) form a first hydraulic chamber, and the second guide sleeve (9) and the fixed spool valve (6) form a second hydraulic chamber. The first hydraulic chamber and the second hydraulic chamber are filled with hydraulic oil. A number of oil passageways are provided between the first hydraulic chamber and the second hydraulic chamber. A first blocking component is provided in the first hydraulic chamber. When the positive pressure difference between the first hydraulic chamber and the second hydraulic chamber exceeds a defined value, the first blocking component can block all the oil passageways, allowing the hydraulic oil to enter the second hydraulic chamber only through the damping holes on the fixed spool valve (6); A second blocking component is provided in the second hydraulic chamber. When the positive pressure difference between the second hydraulic chamber and the first hydraulic chamber exceeds a defined value, the second blocking component can block all the oil passageways, allowing the hydraulic oil to enter the first hydraulic chamber only through the damping holes on the fixed spool valve (6); A valve sleeve (7) is closely sleeved on the outer sides of the first guide sleeve (3) and the second guide sleeve (9). A number of oil chambers are provided between the first guide sleeve (3) and the second guide sleeve (9) and the valve sleeve (7). A number of oil holes corresponding to the oil chambers are provided on the side walls of the first guide sleeve (3) and the second guide sleeve (9). The oil chambers and the oil holes together form the oil passageways.

2. The bi-directional hydraulic damping valve group according to claim 1, wherein, Guide sleeve retaining rings (2) are fixedly connected to both ends of the valve sleeve (7).

3. The bi-directional hydraulic damping valve group according to claim 2, wherein, The guide sleeve retaining rings (2) are made of steel material.

4. The two-way hydraulic damping valve group according to claim 1, wherein The first blocking component includes a first movable spool valve (4) in the shape of a cylindrical barrel with a single-sided opening. A pressure reducing valve hole is provided on the closed end face of the first movable spool valve (4). The first movable spool valve (4) is inserted into the first guide sleeve (3) with the opening side facing the fixed spool valve (6). The first movable spool valve (4) can slide freely while keeping the outer wall in close contact with the inner wall of the first guide sleeve (3). When the first movable spool valve (4) approaches the fixed spool valve (6), it can block the oil passageways. When the first movable spool valve (4) moves away from the fixed spool valve (6), it can dredge the oil passageways. A first spring (5) is provided between the first movable spool valve (4) and the fixed spool valve (6). One end of the first spring (5) is supported on the inner side of the closed end face of the first movable spool valve (4), and the other end is supported on the side of the fixed spool valve (6) close to the first hydraulic chamber. The first guide sleeve (3) is fixedly connected to a first limit sealing retaining ring (1) away from the fixed spool valve (6). Under normal conditions, the first spring (5) presses the first movable spool valve (4) against the inner side of the first limit sealing retaining ring (1) to keep the oil passageways in a dredged state; The second blocking component includes a second movable valve core (10) in the shape of a cylindrical barrel with a single-sided opening, and a pressure reducing valve hole is provided on the closed end surface of the second movable valve core (10). The second movable valve core (10) is inserted into the second guide sleeve (9) with the opening side facing the fixed valve core (6). The second movable valve core (10) can freely slide while keeping the outer wall in close contact with the inner wall of the second guide sleeve (9). When the second movable valve core (10) approaches the fixed valve core (6), it can block the oil passage. When the second movable valve core (10) moves away from the fixed valve core (6), it can dredge the oil passage. A second spring (8) is provided between the second movable valve core (10) and the fixed valve core (6). One end of the second spring (8) is supported on the inner side of the closed end surface of the second movable valve core (10), and the other end is supported on the side of the fixed valve core (6) close to the second hydraulic chamber. The second guide sleeve (9) is fixedly connected with a second limit sealing retaining ring (11) away from the fixed valve core (6). Under normal conditions, the second spring (8) presses the second movable valve core (10) inside the second limit sealing retaining ring (11) to keep the oil passage in a dredged state.

5. The bi-directional hydraulic damping valve group according to claim 4, characterized in that, Both the first limit sealing retaining ring (1) and the second limit sealing retaining ring (11) are made of copper material.

6. The bi-directional hydraulic damping valve group according to claim 4, wherein The pressure reducing valve holes on the closed end surfaces of the first movable valve core (4) and the second movable valve core can have different specifications.

7. The bi-directional hydraulic damping valve group according to claim 4, wherein The first spring (5) and the second spring (8) can have different mechanical property parameters.

8. The bi-directional hydraulic damping valve group according to any one of claims 1 to 7, characterized in that The fixed valve core (6) is a completely sealed structure.

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