CN107023566B - Rotary vane type steering engine static pressure oil seal - Google Patents

Abstract

The invention discloses a static pressure oil seal of a rotary vane type steering engine; the technical problem to be solved is as follows: the sealing device aims at the technical problems that a sealing mode which is generally adopted in the axial direction of a sliding bearing at the lower end of a current rotary vane steering engine in the background art is difficult to replace after being worn, and has long maintenance period and high cost. The technical scheme adopted is as follows: a static pressure oil seal of a rotary vane type steering engine comprises a hydraulic system, a movable vane, a cylinder body and a gland, wherein a sliding bearing is arranged between the lower end of the movable vane and the cylinder body, and an O-shaped sealing ring is arranged between the gland and the cylinder body; the hydraulic oil pump also comprises a static pressure oil seal and a hydraulic oil inlet. The advantages are that: the static pressure oil seal of the rotary vane type steering engine adopts hydraulic pressure to replace the traditional mechanical pressure mode, and the damage to the sealing surface of the oil seal can be effectively avoided by utilizing the hydraulic overload protection performance; meanwhile, the hydraulic pressure is adjustable to realize dynamic compensation, and the reliability is improved.

Description

Rotary vane steering gear hydrostatic oil seal

technical field

The invention relates to a static pressure oil seal for a rotary vane steering gear, which belongs to a mechanical sealing device and is a new type of oil seal. Applied to the axial seal at the sliding bearing at the lower end of the rotary vane steering gear, the hydraulic system of the rotary vane steering gear is used to provide hydraulic oil without additional devices. The bonding force between the seals can be automatically adjusted as the load changes, and the elastic protection of the hydraulic system can effectively avoid mechanical damage.

Background technique

The steering gear is the power device for the ship to steer and control the course. As a type of steering gear, the rotary vane steering gear can be directly installed with the rudder shaft to drive the rudder to reciprocate and swing without installing other auxiliary steering mechanisms such as the tiller handle. Therefore, if the working oil pressure remains unchanged , the output steering torque is a certain value, which has nothing to do with the steering angle. Its overall structure is shown in Figures 1 and 3. It is divided into 6 working chambers A1 and B1 by means of stationary vanes and sealing strips, moving vanes and sealing strips, upper cylinder head and sealing rings, side surfaces of the cylinder body, bottom surface of the cylinder body and sealing rings. . Directly drive the rudder shaft to rotate in both positive and negative directions to realize the function of steering. Rotary vane steering gear has the advantages of easy integration, convenient installation, and wide range of rotation angles, but requires high manufacturing precision and complicated sealing technology.

Marked 9 in Figures 1 and 3 is the commonly used axial sealing method for the sliding bearing at the lower end of the rotor blade steering gear, that is, standard oil seal or stuffing box. Since the rotary vane steering gear and the rudder shaft are fixed on the bottom plate of the engine room after assembly, if the standard oil seal is used and the seal is reduced or mechanically damaged, it must be stopped and entered the dock for replacement operations. The maintenance period is long and the cost is high. If the stuffing box is used for sealing, in the case of normal wear or sudden damage, it is preset to adjust the pressing force of the end cover to compensate, which is often impossible due to the narrow working space. Therefore, the reliability and durability of these two sealing methods are not very satisfactory. Once leakage occurs due to the reduction or failure of the sealing, it will definitely affect the normal use of the steering gear, and even the safety of navigation.

Contents of the invention

The technical problem to be solved by the present invention is: the sealing method commonly used in the axial direction of the lower end sliding bearing of the rotary vane steering gear mentioned in the background technology has the technical problems of difficult replacement after wear, long maintenance period and high cost.

The design idea of the present invention is proposed in view of the lack of axial sealing of the sliding bearing at the lower end of the current rotary vane steering gear. A hydrodynamic seal is proposed, which is applied to the axial seal of the sliding bearing at the lower end of the rotary vane steering gear. The designed "C" groove seal ring is installed on the output shaft of the rotor blade, and is fixed on the lower end of the cylinder body of the rotor blade steering gear through the gland, and at the same time forms a closed cavity, which is connected with the external hydraulic oil through the pipeline, and the working At the same time, the pressure of the hydraulic oil is used to make the contact surface between the sealing ring and the shaft tightly fit to achieve axial sealing. The pressing force can be dynamically adjusted by adjusting the oil pressure of the hydraulic oil. The rotary vane steering gear itself is a hydraulic actuator, so it is convenient and quick to introduce hydraulic oil without additional devices.

The purpose of the present invention is to further improve the axial sealing effect of the sliding bearing at the lower end of the rotary vane steering gear, avoid mechanical damage, facilitate dynamic compensation, and improve reliability. In addition, the material of the sealing ring is optimized through non-standard design, the thickness of the worn part is increased, the durability is further improved, and the overhaul period of the sealing device is extended.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A static pressure oil seal for a rotating vane steering gear, comprising a hydraulic system, a moving vane 4, a cylinder body 6 and a gland, a sliding bearing 7 is arranged between the lower end of the moving blade 4 and the cylinder body 6, and a sliding bearing 7 is arranged between the gland body and the cylinder body 6 An O-ring 8 is set between them; it is characterized in that it also includes a hydrostatic oil seal 8A and a hydraulic oil inlet 8B,

On the surface of the gland that is in contact with the cylinder block 6, an oil seal groove for installing the static pressure oil seal 8A is concavely arranged. The "C"-shaped notch of the pressure oil seal 8A faces the hydraulic oil inlet 8B; an oil hole 21 is set on the side wall of the gland and the oil hole 21 is connected to the "C"-shaped notch of the static pressure oil seal 8A, and the hydraulic oil The oil inlet 8B is installed in the oil hole 21; the O-ring groove 20 for installing the O-ring 8 is arranged on the gland;

An interference of 0.08-0.1mm is guaranteed between the depth d5 of the oil seal groove and the axial dimension d4 of the static pressure oil seal 8A;

The hydraulic oil inlet 8B is connected to the hydraulic system in the rotary vane steering gear.

The rotary vane steering gear mentioned in the technology of the present invention is a conventional technology product in the prior art, and its own hydraulic system is arranged in the rotary vane steering gear, and this hydraulic system is also a conventional technology.

The material of the static pressure oil seal 8A in the technology of the present invention is polyurethane rubber composite material, the size of the inner diameter d3 of the static pressure oil seal 8A is selected with reference to the standard oil seal shaft system, and the axial dimension d4 of the static pressure oil seal 8A is selected according to the required sealing pressure and the rotor blade type. The hydraulic system of the steering gear can provide oil pressure for calculation and determination; the specific calculation method adopts the conventional technical method in the prior art.

When the gland in the technology of the present invention is assembled, an interference of 0.08-0.1MM is guaranteed on both sides of the gland and the static pressure oil seal, that is, the depth d5 of the oil seal groove and the axial dimension d4 of the static pressure oil seal 8A are guaranteed to be 0.08-0.08mm. 0.1mm interference; between the gland and the cylinder body, an O-ring needs to be designed and assembled, thus forming a closed working chamber composed of the oil seal, gland, cylinder body and the output shaft of the moving blade, through the gland on the gland The hydraulic oil inlet is connected to the hydraulic system of the rotary vane steering gear, and the static pressure seal is realized by adjusting the oil pressure.

This solution changes the original method of relying on mechanical pressure to make the sealing surface fit tightly, and instead relies on the oil pressure of the hydraulic system as the pressing force. The hydraulic oil has elastic protection performance. When the pressing force is too large or foreign matter is encountered, the hydraulic pressure The overload protection performance of the oil can avoid damage to the surface of the sealing ring; secondly, the pressure of the hydraulic oil can be adjusted according to the needs, which is convenient and quick; in addition, the hydraulic oil is taken from the hydraulic system of the steering gear itself, so no additional equipment is needed.

As an improvement to the technical solution of the present invention, the hydraulic oil inlet 8B is equipped with a check valve and then connected between the outlet of the pressure control valve and the direction control valve in the hydraulic system of the rotary vane steering gear.

As an improvement to the technical solution of the present invention, the hydraulic oil inlet 8B is equipped with a check valve and then connected to a pressure control valve, and then connected to the outlet port of the hydraulic system pump of the rotary vane steering gear.

The working principle of the static pressure oil seal of the practical rotary vane steering gear is:

In the technical solution of the present invention, the airtight working chamber formed by the static pressure oil seal, the gland, the cylinder body and the output shaft of the moving blade, the hydraulic oil inlet port on the gland is connected to the oil outlet of the one-way valve, and the one-way valve The oil inlet is connected to the hydraulic system of the rotary vane steering gear. Under the action of the hydraulic system's oil pressure, the contact surface of the static pressure seal and the output shaft of the rotary vane steering gear is closely attached, so as to achieve the effect of mechanical sealing. . There are two ways to adjust the pressure, one is to follow the pressure of the working chamber of the steering gear (case 1), and the other is to set a separate pressure control valve (case 2). When the hydraulic system of the steering gear stops working, the one-way Under the action of the valve, a certain pressure can still be maintained in the static pressure sealed chamber. In addition, when encountering excessive pressing force or foreign matter, the overload protection performance of the hydraulic oil can avoid the surface damage of the sealing ring.

The present invention compares with prior art, and its beneficial effect is:

1. The static pressure oil seal of the rotary vane steering gear of the present invention adopts hydraulic pressure to replace the traditional mechanical pressure method, and the overload protection performance of the hydraulic pressure can effectively avoid damage to the sealing surface of the oil seal; at the same time, the hydraulic pressure can be adjusted to realize dynamic compensation and improve reliability.

2. The static pressure oil seal of the rotary vane steering gear of the present invention, through the static pressure oil seal of non-standard design, can optimize the material of the sealing ring, independently design to increase the thickness of the wear part, further improve the durability, and prolong the overhaul cycle of the sealing device. In addition, the hydraulic oil is taken from the hydraulic system of the steering gear itself, so there is no need to add additional equipment and it is easy to access.

Description of drawings

Fig. 1 is the overall structure of the rotary vane rudder hydrostatic oil seal in the prior art.

Fig. 2 is an enlarged view of I in Fig. 1 .

Fig. 3 is a view along the direction A of Fig. 1 .

Fig. 4 is the overall structure of the rotary vane rudder hydrostatic oil seal of the present invention.

Fig. 5 is an enlarged view of II in Fig. 4 .

Fig. 6 is a structural schematic diagram of a hydrostatic oil seal.

Fig. 7 is an enlarged view of III in Fig. 6 .

Fig. 8 is a sectional view of the gland.

Fig. 9 is the hydraulic joint control principle of the rotary vane rudder dynamic and static pressure oil seal of the present invention.

Fig. 10 is the independent control principle of the oil pressure of the rotary vane rudder dynamic and static pressure oil seal of the present invention.

Detailed ways

The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.

In order to make the content of the present invention more obvious and understandable, further description will be made below in conjunction with the accompanying drawings 1-10 and specific implementation methods.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 4 and 5, it is the static pressure oil seal of the rotary vane steering gear of this embodiment. The original method of relying on mechanical pressure to make the sealing surface fit closely is changed to relying on the oil pressure of the hydraulic system as the pressing force. The hydraulic oil has elastic protection performance. When the pressing force is too large or foreign matter is encountered, the overload protection performance of the hydraulic oil can avoid the surface damage of the sealing ring; secondly, the pressure of the hydraulic oil can be adjusted according to the needs, which is convenient and quick; in addition, the hydraulic oil It is derived from the servo's own hydraulic system, so no additional equipment is required.

Rotary vane steering gear, including upper cylinder head 1, upper cylinder head sealing ring 2, moving blade sealing strip 3, moving blade 4, cylinder bottom sealing ring 5, cylinder body 6, sliding bearing 7, O-ring 8, static Pressure oil seal 8A, hydraulic oil inlet 8B, vane sealing strip 11 and vane 12.

Rotary vane steering gear is divided into 6 working chambers A1, B1, A2, B2, A3, B3, every 3 phase-to-phase sealed chambers are connected to form a working chamber, that is, A1, A2, A3 are connected, B1, B2, B3 are connected, so that under the control of the hydraulic system, the rotor can directly drive the rudder The shaft rotates in both positive and negative directions to realize the steering function. Rotary vane steering gear has the advantages of easy integration, convenient installation, and wide range of rotation angles, but requires high manufacturing precision and complicated sealing technology.

The static pressure oil seal of the rotary vane steering gear includes a hydraulic system 21, a moving vane 4, a cylinder body 6 and a gland, a sliding bearing 7 is arranged between the lower end of the moving blade 4 and the cylinder body 6, and a sliding bearing 7 is arranged between the gland and the cylinder body 6. An O-shaped seal ring 8 is arranged between them; it also includes a static pressure oil seal 8A and a hydraulic oil inlet 8B, and an oil seal groove for installing the static pressure oil seal 8A is provided on the surface of the gland that is in contact with the cylinder body 6. The cross-section of the pressure oil seal 8A is "C", the static pressure oil seal 8A is installed in the oil seal groove and the "C" shape notch of the static pressure oil seal 8A faces the hydraulic oil inlet 8B; it is set on the side wall of the gland The oil hole 21 and the oil hole 21 are connected to the "C"-shaped notch of the static pressure oil seal 8A, and the hydraulic oil inlet 8B is installed in the oil hole 21; The ring groove 20; the depth d5 of the oil seal groove and the axial dimension d4 of the static pressure oil seal 8A ensure an interference of 0.08-0.1mm; the hydraulic oil inlet 8B is connected to the hydraulic system in the rotary vane steering gear.

Case 1:

As shown in Figure 9, the hydraulic oil inlet 8B is equipped with a check valve and then connected between the outlet of the pressure control valve 21 of the hydraulic system of the rotary vane steering gear and the direction control valve. The working load pressure of the steering gear, when the load increases, the pressure of the static pressure seal also increases correspondingly, and vice versa, the dynamic compensation effect is good. When shutting down, because of the check valve at the front end of the oil inlet, the sealing pressure of the hydrostatic oil seal can be maintained, and the sealing effect can always be maintained. 21 marked in accompanying drawing 9 is the hydraulic system of the rotary vane steering gear, 22 is the actuator of the rotary vane steering gear, and 23 is the hydrostatic oil seal device of the lower end sliding bearing.

Case 2:

As shown in Figure 10, the hydraulic oil inlet 8B is equipped with a check valve and then connected to the pressure control valve, and then connected to the outlet port of the hydraulic system pump of the rotary vane steering gear. In this working mode, the oil pressure of the static pressure oil seal can be It is set separately, but once set, it will remain unchanged unless it is manually adjusted. The advantage is that it can be set to a more appropriate pressure based on observation. The disadvantage is that it cannot be automatically adjusted according to the change in the working load of the rotor blade servo. When shutting down, the sealing pressure of the static pressure oil seal can be maintained because of the check valve at the front end of the oil port. 21 marked in accompanying drawing 10 is the hydraulic system of the rotary vane steering gear, 22 is the actuator of the rotary vane steering gear, and 23 is the hydrostatic oil seal device of the lower end sliding bearing.

The parts not involved in the present invention are the same as the prior art or can be realized by adopting the prior art.

As stated above, while the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (3)

1. A static pressure oil seal of a rotary vane type steering engine comprises a hydraulic system, a movable vane (4), a cylinder body (6) and a gland, wherein a sliding bearing (7) is arranged between the lower end of the movable vane (4) and the cylinder body (6), and an O-shaped sealing ring (8) is arranged between the gland and the cylinder body (6); the hydraulic steering engine is characterized by further comprising a static pressure oil seal (8A) and a hydraulic oil inlet (8B), wherein the static pressure oil seal (8A) is arranged below the sliding bearing (7) and used for sealing the sliding bearing (7) at the lower end of the rotary vane type steering engine;

an oil seal groove for mounting a static pressure oil seal (8A) is concavely arranged on the surface of the gland, which is in contact with the cylinder body (6), the section of the static pressure oil seal (8A) is C-shaped, the static pressure oil seal (8A) is mounted in the oil seal groove, and the C-shaped notch of the static pressure oil seal (8A) faces to a hydraulic oil inlet (8B); an oil hole (21) is formed in the side wall of the gland, the oil hole (21) is communicated with a C-shaped notch of the static pressure oil seal (8A), and a hydraulic oil inlet (8B) is arranged in the oil hole (21); an O-shaped ring groove (20) for installing an O-shaped sealing ring (8) is arranged on the gland;

the interference magnitude of 0.08-0.1mm is ensured between the depth d5 of the oil seal groove and the axial dimension d4 of the static pressure oil seal (8A);

the hydraulic oil inlet (8B) is assembled with a one-way valve and then connected with a hydraulic system in the rotary vane type rudder machine.

2. The rotary vane type steering engine static pressure oil seal according to claim 1, characterized in that a hydraulic oil inlet (8B) is assembled with a one-way valve and then connected between an outlet of a pressure control valve and a direction control valve in a hydraulic system of the rotary vane type steering engine.

3. The static pressure oil seal of the rotary vane steering engine according to claim 1, wherein a hydraulic oil inlet (8B) is connected with a pressure control valve after being assembled with a one-way valve, and then is connected with an outlet end of a hydraulic system pump of the rotary vane steering engine.

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