A hydraulically position-controlled vibration isolator

Abstract

This invention discloses a hydraulically position-controlled vibration isolator, belonging to the field of vibration reduction and noise reduction technology. The vibration isolator includes a base, a support plate, vibration-isolating elastomers, an upper mounting plate, a piston, a cylinder liner, a displacement sensor, a hydraulic unit, and a motor driver. The mounting plate is connected to the support plate through two symmetrically arranged vibration-isolating elastomers. A piston that can move up and down is installed in the cylinder of the base through a cylinder liner, forming a rodless chamber and a rod chamber of the cylinder. The support plate is mounted on the piston and can move up and down with it. A contact displacement sensor detects the relative position between the base and the upper mounting plate. The motor driver controls the hydraulic unit to drive the piston to move the support plate to compensate for the deformation of the elastomers. This invention achieves the goal of maintaining the installation height of the vibration isolator unchanged when the load on the vibration isolator changes significantly, while still meeting the vibration isolation effect.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction and noise reduction technology, and specifically relates to a hydraulic position control vibration isolator. Background Technology

[0002] Many engineering equipment, such as ships, require elastic supports to reduce vibration and noise. Currently, vibration isolation for this equipment mostly uses linear or non-linear rubber isolators. The stiffness of these isolators cannot be adjusted; to achieve the desired isolation effect, the stiffness must be less than a given value. However, the lower the stiffness, the greater the static deformation of the isolator, which cannot meet the requirements for isolators for equipment such as ship stern shaft thrust bearings. The load on thrust bearings and similar equipment changes significantly with the ship's propulsion speed. Simultaneously, to ensure the normal operation of the stern shaft, its relative position must remain essentially constant, thus requiring sufficiently high isolator stiffness, which again fails to meet the required isolation effect. While some equipment uses airbag isolators, which allow for equipment position adjustment, their stroke is limited, and they require an external high-pressure air station connected via pipelines and cables, making use and maintenance inconvenient. Summary of the Invention

[0003] In view of this, the present invention provides a hydraulically position-controlled vibration isolator, which can effectively solve the problem that existing vibration isolators must have a stiffness less than a certain given value in order to achieve the desired vibration isolation effect, causing the deformation of the vibration isolator to exceed the allowable displacement of the equipment.

[0004] A hydraulically position-controlled vibration isolator includes a base, a support plate, a vibration isolating elastomer, an upper mounting plate, a piston, a cylinder liner, a displacement sensor, a hydraulic unit, and a motor driver.

[0005] The base consists of a horizontal section and a vertical section. A hydraulic unit and a motor driver are installed at the bottom of the horizontal section. A piston mounting cavity is provided on the vertical section. After the piston and cylinder are fitted into the piston mounting cavity, the mounting cavity is divided into a rod chamber and a rodless chamber. The area of ​​the rodless chamber is larger than that of the rod chamber. The rod chamber and the rodless chamber are connected to the hydraulic unit through two oil ports to form an oil circuit. The support plate is movably fitted to the vertical section of the base. The support plate is mounted on the piston and can move up and down with it. The upper mounting plate is connected to the support plate through two symmetrically arranged vibration-damping elastic bodies. A displacement sensor is installed on the base and detects the relative position between the base and the upper mounting plate through a baffle installed on the upper mounting plate. The motor driver changes the flow direction of the oil in the oil circuit by controlling the rotation direction of the oil pump unit in the hydraulic unit, thereby driving the piston to move the support plate to compensate for the deformation of the vibration-damping elastic body, so that the height of the vibration isolator remains unchanged after the vibration-damping elastic body deforms.

[0006] Furthermore, a sliding bushing is installed between the vertical section of the base and the mating surface of the support plate.

[0007] Furthermore, the piston is composed of two cylindrical segments with different diameters. The larger diameter segment is the piston segment, and the smaller diameter segment is the piston rod. The piston rod is fitted with the cylinder liner and installed in the piston mounting cavity. The cavity formed between the stepped surface between the piston segment and the piston rod and the cylinder liner is the rod cavity, and the cavity below the piston segment is the rodless cavity. A piston seal is installed on the piston segment, and cylinder liner piston rod seal and cylinder liner static seal are installed on the inner and outer sides of the cylinder liner, respectively.

[0008] Furthermore, the hydraulic unit includes a closed-loop oil pump unit, a compensated closed oil tank, two normally open threaded cartridge check valves, one normally open threaded cartridge hydraulic check valve, one normally open threaded cartridge relief valve, one normally open threaded cartridge shuttle valve, two normally open threaded cartridge balance valves, and one normally open pressure sensor; the A port and B port of the closed-loop oil pump unit are respectively connected to one normally open threaded cartridge balance valve, and the normally open threaded cartridge balance valves are connected to the rodless chamber and the rod chamber through oil ports, and the two normally open... A normally open threaded cartridge hydraulic control check valve, two normally open threaded cartridge check valves connected in series, and a normally open threaded cartridge shuttle valve are connected in parallel among the threaded cartridge balance valves. The normally open threaded cartridge relief valve is connected to the normally open threaded cartridge shuttle valve, the two normally open threaded cartridge check valves, the normally open threaded cartridge hydraulic control check valve, and the L port of the closed oil pump unit. The normally open pressure sensor is connected between the oil port and the normally open threaded cartridge balance valve. The normally open threaded cartridge hydraulic control check valve is connected to the compensation closed oil tank.

[0009] Furthermore, both the upper mounting plate and the base have mounting holes, and the upper mounting plate and the base are connected to the equipment and the mounting base respectively by bolts.

[0010] Furthermore, after the hydraulic position control vibration isolator is installed, if the load on the isolated equipment changes, causing deformation of the vibration isolating elastomer, the contact displacement sensor detects a change in the relative position between the base and the upper mounting plate. The closed-loop oil pump unit starts and rotates clockwise or counterclockwise. Pressurized oil passes through port A or B of the closed-loop oil pump unit, through the normally open threaded cartridge balance valve and the normally open threaded cartridge check valve, and enters the rodless or rod chamber through the oil port, driving the piston to extend or retract, thus moving the support plate along the sliding path. The moving shaft sleeve moves in the opposite direction to the aforementioned displacement; the oil in the other chamber returns to port B or port A of the closed-loop oil pump unit through the oil port and the normally open threaded cartridge balance valve, forming an oil circuit, thereby keeping the height of the vibration isolator constant; when the drive piston moves in the retraction direction, since the area of ​​the rodless chamber is larger than the area of ​​the rod chamber, the excess oil returns to the compensation closed oil tank through the normally open threaded cartridge hydraulic control check valve; conversely, when the drive piston moves in the extension direction, the oil in the compensation closed oil tank replenishes the closed-loop oil pump unit.

[0011] Beneficial effects:

[0012] 1. The hydraulic position control vibration isolator of the present invention uses an upper mounting plate connected to a support plate via two symmetrically arranged vibration isolating elastic bodies to form an elastic connection between the base and the upper mounting plate, thereby producing a vibration isolation effect. Simultaneously, a piston that can move up and down is placed inside the cylinder of the base and mounted on the base via a cylinder liner. The piston seal, cylinder liner piston rod seal, and cylinder liner static seal form the rodless chamber and rod chamber of the cylinder. The support plate is mounted on the piston and can move up and down with it. A contact displacement sensor is also used to detect the relative position between the base and the upper mounting plate. A motor driver controls the hydraulic unit to drive the piston, which in turn drives the support plate to compensate for the deformation of the elastic bodies. This achieves the goal of maintaining the vibration isolator's installation height unchanged even when the load on the vibration isolator changes significantly, while still meeting the vibration isolation effect.

[0013] 2. The hydraulic unit and motor driver of the hydraulic position control vibration isolator of the present invention are integrated at the bottom of the base. It can be put into operation simply by plugging in a DC24V power supply. Moreover, the vibration isolators use existing mature industrial-grade products, so they are easy to use and maintain, and have high interchangeability and reliability.

[0014] 3. This invention uses a high-precision displacement sensor for detection, resulting in high position control accuracy, which can meet the vibration isolation requirements of equipment with high position accuracy requirements, such as thrust bearings in ship shafting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hydraulically controlled vibration isolator retracting position in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the hydraulically controlled vibration isolator extension position in an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the hydraulic principle of the hydraulic position control vibration isolator in an embodiment of the present invention.

[0018] Among them, 1-base, 11-mounting hole, 2-support plate, 21-sliding bushing, 3-vibration isolation elastomer, 4-upper mounting plate, 41-mounting hole, 5-piston, 51-piston seal, 54-rodless chamber, 55-rod chamber, 56-oil port, 57-oil port, 58-gasket, 59-nut, 6-contact displacement sensor, 61-baffle, 7-cylinder liner, 71-cylinder liner piston rod seal, 72-cylinder liner static seal, 73-screw, 8-hydraulic single... 81-Closed-loop oil pump unit, 82-Compensated closed oil tank, 83-Normal open-type threaded cartridge check valve, 84-Normal open-type threaded cartridge check valve, 85-Normal open-type threaded cartridge hydraulic check valve, 86-Normal open-type threaded cartridge relief valve, 87-Normal open-type threaded cartridge shuttle valve, 88-Normal open-type threaded cartridge balance valve, 89-Normal open-type threaded cartridge balance valve, 9-Motor driver, 90-Normal open-type pressure sensor, 91-DC24V power connector. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] As attached Figure 1 As shown, the present invention provides a hydraulic position control vibration isolator, including an integrated cylinder vibration isolator base 1, an elastic body moving support plate 2, a vibration isolating elastic body 3, a vibration isolator upper mounting plate 4, a sliding bushing 21, a piston and piston rod 5, a piston seal 51, a cylinder liner 7, a cylinder liner piston rod seal 71, a cylinder liner static seal 72, a screw 73, a displacement sensor 6, a small baffle 61, a hydraulic unit 8, and a motor driver 9.

[0021] The base 1 is equipped with a hydraulic unit 8 and a motor driver 9 at its bottom; the two oil supply ports of the hydraulic unit 8 are connected to the oil ports 56 and 57 on the base 1 respectively through pipelines; the motor driver 9 is externally connected to a DC24V power connector 91.

[0022] Inside the cylinder of the base 1, a piston 5 that can move up and down is placed and is mounted on the base 1 by a cylinder liner 7 and a screw 73; the piston seal 51, the cylinder liner piston rod seal 71, and the cylinder liner static seal 72 form the rodless chamber 54 and the rod chamber 55 of the oil cylinder; the elastic body moving support plate 2 is mounted on the piston and piston rod 5 by a gasket 58 and a nut 59 and can move up and down with them;

[0023] The mounting plate 4 of the above-mentioned vibration isolator is connected to the elastic body moving support plate 2 through two vibration isolating elastic bodies 3 arranged symmetrically on the left and right, forming an elastic connection between the integrated cylinder vibration isolator base 1 and the mounting plate 4 of the vibration isolator, thereby producing a vibration isolation effect.

[0024] The aforementioned integrated cylinder isolator base 1 is also equipped with a contact displacement sensor 6, which is used to detect the relative position between the integrated cylinder isolator base 1 and the isolator mounting plate 4 via a baffle 61 mounted on the isolator mounting plate 4.

[0025] As attached Figure 3 As shown, the hydraulic unit 8 includes a closed-loop oil pump unit 81, a compensated closed oil tank 82, a normally open threaded cartridge check valve 83, a normally open threaded cartridge check valve 84, a normally open threaded cartridge hydraulically controlled check valve 85, a normally open threaded cartridge relief valve 86, a normally open threaded cartridge shuttle valve 87, a normally open threaded cartridge balance valve 88, a normally open threaded cartridge balance valve 89, and a normally open pressure sensor 90. Ports A and B of the closed-loop oil pump unit 81 are respectively connected to the normally open threaded cartridge balance valve 88 and the normally open threaded cartridge balance valve 89. The normally open threaded cartridge balance valve 88 enters the rodless chamber 54 of the cylinder through port 56, and the normally open threaded cartridge balance valve 89 enters the rod chamber 54 of the cylinder through port 57. 5. A normally open threaded cartridge balance valve 88 and normally open threaded cartridge balance valve 89 are connected in parallel with a normally open threaded cartridge hydraulic control check valve 85, a normally open threaded cartridge check valve 83, a normally open threaded cartridge check valve 84, and a normally open threaded cartridge shuttle valve 87 connected in series. A normally open threaded cartridge relief valve 86 is connected to the normally open threaded cartridge shuttle valve 87, normally open threaded cartridge check valve 83, normally open threaded cartridge check valve 84, normally open threaded cartridge hydraulic control check valve 85, and the L port of the closed oil pump unit 81. A normally open pressure sensor 90 is connected between the oil port 56 and the normally open threaded cartridge balance valve 88. The normally open threaded cartridge hydraulic control check valve 85 is connected to the compensation closed oil tank 82.

[0026] The aforementioned vibration isolator has mounting holes 41 on the mounting plate 4 and mounting holes 11 on the integrated cylinder vibration isolator base 1, which can be connected to the equipment and its mounting base by bolts respectively.

[0027] After the hydraulic position control vibration isolator is installed, if the load on the isolated equipment changes, causing deformation of the vibration isolator elastomer 3, the contact displacement sensor 6 of the vibration isolator detects a change in the relative position between the base 1 and the mounting plate 4 on the vibration isolator, resulting in displacement. The closed-loop oil pump unit 81 starts and rotates clockwise or counterclockwise. Pressurized oil passes through port A or B of the oil pump, through the check valve in the normally open threaded cartridge balance valve 88 or 89, and through port 56 or 57 into the rodless chamber 54 or rod chamber 55 of the oil cylinder, driving the piston 5 to extend or retract, causing the support plate 2 to move along the sliding sleeve 21 in the opposite direction of the aforementioned displacement. The oil in the other chamber of the oil cylinder returns to port B or A of the closed-loop oil pump unit 81 through port 57 or 56, through the normally open threaded cartridge balance valve 89 or 88, forming an oil circuit. This ensures that the height H of the vibration isolator remains constant. (See attached...) Figure 2 and 3As shown.

[0028] When the drive piston 5 moves in the retraction direction, because the area of ​​the rodless chamber is larger than that of the rod chamber, the excess oil returns to the compensating closed oil tank 82 through the normally open threaded cartridge hydraulic control check valve 85. Conversely, when the drive piston and piston rod 5 move in the extension direction, the oil in the compensating closed oil tank 82 replenishes the closed oil pump unit 81. The system uses bidirectional normally open threaded cartridge balance valves 88 and 89 to overcome the load on the piston and piston rod 5. By changing the rotation direction and speed of the closed oil pump unit 81, the movement direction and speed of the elastic body moving support plate 2 can be controlled to meet the load change requirements of the vibration isolator. When the pressure in the rodless chamber 54 or the rod chamber 55 of the cylinder exceeds the system's set pressure, the high-pressure oil selects a high pressure through the normally open threaded cartridge shuttle valve 87, opens the normally open threaded cartridge overflow valve 86, and returns to the compensating closed oil tank 82, thereby ensuring system safety.

[0029] When multiple hydraulically controlled vibration isolators are used, they form a vibration isolation system for the equipment.

[0030] Driven by a hydraulic unit 8 integrated inside the cylinder isolator base and detected by a contact displacement sensor 6, the installation height H of the isolator remains essentially constant. It has a fast response time and high control accuracy, which can meet the vibration isolation requirements of equipment with high positional accuracy requirements, such as ship shafting.

[0031] Because it uses the DC24V power connector 91 of the motor driver 9, it can be put into operation simply by plugging in a DC24V power supply. Moreover, the vibration isolators are all existing mature industrial-grade products, so they are easy to use and maintain, and have high interchangeability and reliability.

[0032] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hydraulically position-controlled vibration isolator, characterized in that, Includes a base, support plate, vibration damping elastomer, upper mounting plate, piston, cylinder liner, displacement sensor, hydraulic unit, and motor driver; The base consists of a horizontal section and a vertical section. A hydraulic unit and a motor driver are installed at the bottom of the horizontal section. A piston mounting cavity is provided on the vertical section. After the piston and cylinder are fitted into the piston mounting cavity, the mounting cavity is divided into a rod chamber and a rodless chamber. The area of ​​the rodless chamber is larger than that of the rod chamber. The rod chamber and the rodless chamber are connected to the hydraulic unit through two oil ports to form an oil circuit. The support plate is movably fitted to the vertical section of the base. The support plate is mounted on the piston and can move up and down with it. The upper mounting plate is connected to the support plate through two symmetrically arranged vibration-damping elastic bodies. A displacement sensor is installed on the base and detects the relative position between the base and the upper mounting plate through a baffle installed on the upper mounting plate. The motor driver changes the flow direction of the oil in the oil circuit by controlling the rotation direction of the oil pump unit in the hydraulic unit, thereby driving the piston to move the support plate to compensate for the deformation of the vibration-damping elastic body, so that the height of the vibration isolator remains unchanged after the vibration-damping elastic body deforms.

2. The hydraulically position-controlled vibration isolator as described in claim 1, characterized in that, A sliding bushing is installed between the vertical section of the base and the mating surface of the support plate.

3. The hydraulically position-controlled vibration isolator as described in claim 2, characterized in that, The piston is composed of two cylindrical sections with different diameters. The larger diameter section is the piston section, and the smaller diameter section is the piston rod. The piston rod is fitted with the cylinder liner and installed in the piston mounting cavity. The cavity formed between the stepped surface between the piston section and the piston rod and the cylinder liner is the rod cavity, and the cavity below the piston section is the rodless cavity. A piston seal is installed on the piston section, and cylinder liner piston rod seal and cylinder liner static seal are installed on the inner and outer sides of the cylinder liner, respectively.

4. The hydraulically position-controlled vibration isolator as described in claim 3, characterized in that, The hydraulic unit includes a closed-loop oil pump unit, a compensated closed oil tank, two normally open threaded cartridge check valves, one normally open threaded cartridge hydraulic check valve, one normally open threaded cartridge relief valve, one normally open threaded cartridge shuttle valve, two normally open threaded cartridge balance valves, and one normally open pressure sensor. Ports A and B of the closed-loop oil pump unit are each connected to a normally open threaded cartridge balance valve. The normally open threaded cartridge balance valves are connected to the rodless chamber and the rod chamber via oil ports. The two normally open threaded cartridge check valves... A normally open threaded cartridge hydraulic control check valve, two normally open threaded cartridge check valves connected in series, and a normally open threaded cartridge shuttle valve are connected in parallel between the cartridge balance valves. The normally open threaded cartridge relief valve is connected to the normally open threaded cartridge shuttle valve, the two normally open threaded cartridge check valves, the normally open threaded cartridge hydraulic control check valve, and the L port of the closed oil pump unit. The normally open pressure sensor is connected between the oil port and the normally open threaded cartridge balance valve. The normally open threaded cartridge hydraulic control check valve is connected to the compensation closed oil tank.

5. The hydraulically position-controlled vibration isolator as described in claim 4 or 3, characterized in that, After the hydraulically positioned vibration isolator is installed, if the load on the isolated equipment changes, causing deformation of the vibration isolator elastomer, the contact displacement sensor detects a change in the relative position between the base and the upper mounting plate. The closed-loop oil pump unit starts and rotates clockwise or counterclockwise. Pressurized oil passes through port A or B of the closed-loop oil pump unit, through the normally open threaded cartridge balance valve and the normally open threaded cartridge check valve, and enters the rodless or rod chamber through the oil port, driving the piston to extend or retract, and causing the support plate to move along the sliding bushing in the opposite direction of the displacement. The oil in the other chamber returns to port B or A of the closed-loop oil pump unit through the oil port and the normally open threaded cartridge balance valve, forming an oil circuit, thereby keeping the height of the vibration isolator constant. When the piston moves in the retraction direction, since the area of ​​the rodless chamber is larger than that of the rod chamber, the excess oil returns to the compensation closed oil tank through the normally open threaded cartridge hydraulic control check valve. Conversely, when the piston moves in the extension direction, the oil in the compensation closed oil tank replenishes the closed-loop oil pump unit.

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