CN205478675U - Hydraulic system dynamic pressure balances pressure compensation device under water - Google Patents

Abstract

The utility model discloses a hydraulic system dynamic pressure balances pressure compensation device under water, including epicoele shell and the cavity of resorption shell that is connected, the water entry has been seted up at epicoele shell top, be provided with constant force spring in the cavity of resorption shell, be provided with the piston with the contact of epicoele shell inner wall in the epicoele shell, the piston is connected with constant force spring, the piston can be in the epicoele shell up -and -down motion, the fluid entry has been seted up to cavity of resorption shell lower part, and place in the oil tank, the oil tank is connected with the constant delivery pump, the constant delivery pump passes through controlling element control, through piston response seawater pressure and with pressure transmission to hydraulic system, pressor effect in advance through constant force spring, make the system pressure a little more than seawater pressure, when outside marine environment pressure changes, the piston removes along the axis, give the system with pressure transmission, because the permanent tensile characteristic of constant force spring, system internal -external differential pressure remains the invariant throughout, prevent extra large water invading hydraulic system.

Description

Dynamic pressure balance pressure compensation device of underwater hydraulic system

【Technical field】

The utility model belongs to the field of fluid pressure actuators, in particular to a dynamic pressure balance pressure compensation device for an underwater hydraulic system.

【Background technique】

my country has entered a period of large-scale and multi-directional development and utilization of marine resources, and the development of deep-water equipment is the only way to realize marine exploration and development. For the hydraulic control system of these underwater equipment, the performance of the hydraulic system will be affected in the environment of large seawater pressure changes, strong corrosion and large temperature changes. One of the key problems that the system needs to solve.

In the early days, hydraulic equipment was usually placed in a closed pressure vessel to resist deep-sea pressure through the characteristics of the rigid vessel itself, but this method not only increased the volume of the vessel, but also made the vessel relatively cumbersome, and the installation and maintenance of components were also very difficult. difficulty. The commonly used pressure compensator is mainly composed of shell, membrane, compensation spring and other parts, and the pressure of seawater is transmitted to the hydraulic system through the deformation of the membrane. But these traditional pressure compensators still have many drawbacks:

1) If the actuator of the system is an asymmetric actuator, then due to the different volumes of the two chambers of the actuator, the spring deformation of the compensator will be different when the pressure compensation is performed, making the compensation pressure inconsistent before and after, which will greatly affect the accuracy of the system. big impact. That is, the pressure difference between the compensation pressure of the system and the seawater pressure is not constant, and the compensation accuracy is not high.

2) There is an oil leakage problem in the traditional pressure compensator. If the equipment only works underwater for a short time, the compensator can be filled with oil before launching. If the equipment needs to work underwater for a long time, it is impossible to replenish oil when the equipment is working. Therefore, the sealing problem of the compensator is very important.

【Content of utility model】

The purpose of this utility model is to overcome the above disadvantages and provide a dynamic pressure balance pressure compensation device for an underwater hydraulic system, which can solve the problem of the current pressure difference between the compensation pressure of the system and the seawater pressure and the oil leakage of the compensator.

In order to achieve the above purpose, the utility model includes an upper chamber shell and a lower chamber shell connected with each other. The top of the upper chamber shell is provided with a water inlet, the lower chamber shell is provided with a constant force spring, and the upper chamber shell is provided with an inner wall of the upper chamber shell. The contacting piston, the piston is connected with a constant force spring, the piston can move up and down in the housing of the upper chamber, the lower part of the housing of the lower chamber is provided with an oil inlet, and placed in the oil tank, the oil tank is connected with a quantitative pump, and the quantitative pump is controlled by a control element.

The constant force spring is two scroll springs, and the head ends of the two scroll springs are connected with the piston.

The water inlet is covered with a filter screen.

The filter screen is fixed on the upper part of the upper chamber shell by the second screw.

A concave hole is arranged in the center of the piston, and a groove is opened on the side of the piston, and eight through holes connected with the concave hole are evenly distributed in the groove.

A sealing ring is arranged on the groove on the side of the piston.

The material of the sealing ring is fluorine rubber.

A T-shaped connecting block is arranged at the bottom of the piston, and the T-shaped connecting block is connected with a constant force spring.

The T-shaped connecting block is connected with the constant force spring through the second bolt.

The upper chamber shell and the lower chamber shell are connected by first bolts, and gaskets are arranged on the contact surfaces of the upper chamber shell and the lower chamber shell.

Compared with the prior art, the utility model is applied to the pressure compensation of the hydraulic system in which the hydraulic system is all located in the deep sea to relieve the influence of the seawater pressure on the hydraulic system, sense the seawater pressure through the piston and transmit the pressure to the hydraulic system, and pass the constant force spring The pre-pressurization function makes the system pressure slightly higher than the seawater pressure. When the pressure of the external ocean environment changes, the piston moves along the axis and transmits the pressure to the system. Due to the characteristics of constant force spring and constant tension, the pressure difference between the inside and outside of the system is always maintained. Constant, preventing seawater from intruding into the hydraulic system, the system has high compensation accuracy.

Further, the constant force spring of the present invention is two scroll springs, when the metal sheet is extended (twisted), the internal stress resists the load force, which is exactly the same as the common extension spring, but the coefficient is close to constant (zero), That is, within a certain working range of the constant force spring, the spring tension does not change with the change of the deformation of the spring, and its output remains a constant force output.

Further, the utility model is provided with a sealing ring, so that the system pressure acts on the sealing ring through the through hole, so that the sealing ring is firmly attached to the inner wall of the shell, and maintains a very high degree of sealing. After a long time of use, the outer ring of the sealing ring has There is a small amount of wear, but the system pressure acts on the inner ring of the sealing ring, giving it a radial expansion force, and the sealing ring expands outward, and can still adhere to the inner wall of the shell to maintain a good seal, thereby improving the stability and life of the system.

Further, the material of the sealing ring of the present invention is made of fluororubber, which has a wider working range, excellent oil resistance, chemical resistance, high strength and long service life compared with other traditional rubbers.

【Description of drawings】

Fig. 1 is the structural diagram of the utility model initial state;

Fig. 2 is the structural diagram of the limit working position of the utility model;

Fig. 3 is a half-sectional view of the utility model piston;

Fig. 4 is a diagram of an application example of the utility model.

【detailed description】

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model comprises a connected upper cavity shell 1 and a lower cavity shell 6, the upper cavity shell 1 and the lower cavity shell 6 are connected by the first bolt 4, and the upper cavity shell 1 and the lower cavity housing 6 are provided with a gasket 5 on the contact surface, the top of the upper cavity housing 1 is provided with a water inlet, and the water inlet is covered with a filter screen 12, and the filter screen 12 is fixed on the upper part of the upper cavity housing 1 by the second screw 11. A constant force spring 7 is arranged in the chamber shell 6, and a piston 2 which is in contact with the inner wall of the upper chamber shell 1 is arranged in the upper chamber shell 1. The piston 2 is connected with the constant force spring 7, and the piston 2 can move up and down in the upper chamber shell 1. The lower part of the lower chamber casing 6 is provided with an oil inlet, and placed in the fuel tank 13, the fuel tank is connected with a quantitative pump 14, the quantitative pump 14 is controlled by a control element, the constant force spring 7 is two scroll springs, and the two scroll springs Both ends are connected with the piston 2.

The center of the piston 2 is provided with a concave hole, and the side of the piston 2 is provided with a groove, and eight through holes connected with the concave hole are evenly distributed in the groove, and a sealing ring 3 is arranged on the groove on the side of the piston 2. The material of the sealing ring is fluorine rubber, and the bottom of the piston 2 is provided with a T-shaped connecting block 9, which is connected with the constant force spring, and the T-shaped connecting block 9 is connected with the constant force spring through the second bolt 8.

Constant force springs are a special type of extension spring that consist of helical sheets of metal that are bent on the inside so that each turn of the sheet wraps tightly around the turn of the sheet inside it

The utility model adopts nickel alloy, which has higher stability and service life.

In actual application, after the seawater is filtered by the filter screen 12, it enters the interior of the compensator from the axial through hole of the upper chamber shell 1, and transmits the pressure to the piston 2, and the piston 2 floats up and down with the change of seawater pressure. The pressure is transmitted to the inside of the lower chamber shell 6, and the internal medium of the compensator enters the through hole in the piston through the through hole on the T-shaped connecting block 9 to act on the sealing ring 3, and the pressure in the lower chamber shell 6 expands radially to the sealing ring 3 When the pressure of the lower chamber shell 6 is transmitted to the fuel tank 13, the pressure of the fuel tank 11 and the hydraulic circuit will rise or fall accordingly, and then the control element controls the fixed displacement pump 14 to make its oil outlet pressure rise or fall corresponding to the circuit pressure .

Claims (10)

1. The dynamic pressure balance pressure compensation device of the underwater hydraulic system is characterized in that it includes an upper cavity shell (1) and a lower cavity shell (6) connected to each other, a water inlet is opened on the top of the upper cavity shell (1), and the lower cavity shell (6) is provided with a constant force spring (7), and the upper chamber housing (1) is provided with a piston (2) in contact with the inner wall of the upper chamber housing (1), and the piston (2) is connected to the constant force spring (7), The piston (2) can move up and down in the upper chamber housing (1), and the lower part of the lower chamber housing (6) is provided with an oil inlet, and placed in the oil tank (13), the oil tank is connected with a quantitative pump (14), and the quantitative pump ( 14) Controlled by control elements. 2. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 1, characterized in that: the constant force spring (7) is two scroll springs, and the head ends of the two scroll springs are connected to the piston (2) Connection. 3. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 1, characterized in that: the water inlet is covered with a filter screen (12). 4. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 3, characterized in that: the filter screen (12) is fixed on the upper part of the upper chamber shell (1) by the second screw (11). 5. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 1, characterized in that: the center of the piston (2) is provided with a concave hole, and the side of the piston (2) is provided with a groove, Eight through holes connected with the concave holes are evenly distributed in the groove. 6. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 5, characterized in that: a sealing ring (3) is arranged on the groove on the side of the piston (2). 7. The underwater hydraulic system dynamic pressure balance pressure compensator according to claim 6, characterized in that: the sealing ring (3) is made of fluorine rubber. 8. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 1, characterized in that: the bottom of the piston (2) is provided with a T-shaped connecting block (9), and the T-shaped connecting block (9) is connected to the constant The force spring is connected. 9. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 8, characterized in that: the T-shaped connecting block (9) is connected with a constant force spring through a second bolt (8). 10. The underwater hydraulic system dynamic pressure balance pressure compensation device according to claim 1, characterized in that: the upper chamber housing (1) and the lower chamber housing (6) are connected by first bolts (4), and the upper Gaskets (5) are arranged on the contact surfaces of the cavity shell (1) and the lower cavity shell (6).