Pressure compensation device
By using two sealed airbags and the connecting cavity in deep-sea operation equipment, the pressure adjustment of the pressure inside the pressure cavity is achieved, and the traditional pressure compensation device has solved the problem that there are many sealing surfaces, high leakage risks, and high spring corrosion and failure risks. The problem of improving the reliability and service life of the equipment.
Patent Information
- Application Number
- CN202411737126.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-02-14
AI Technical Summary
Traditional pressure compensation devices have problems such as many sealing surfaces, high leakage risk, and high spring corrosion and failure risks in deep-sea operations, which leads to easy damage to the equipment when under high pressure.
Two sealed airbags are used to form a pressure cavity with the connecting cavity. Pressure cavity is prefilled and adjusted through an inflatable pressure regulating valve to adjust the compensation volume, and the pressure is transferred through the orifice plate at the end of the airbag shell to realize the equipment. The balance of internal and external pressures.
By adjusting the internal pressure of the pressure chamber, the balance between the internal and external pressures of the equipment is achieved, the equipment is avoided from damage caused by excessive pressure, the equipment is improved, the equipment is reliable and service life, and maintenance needs are reduced.
Smart Images
Figure CN119429047A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of deep diving or high pressure technology, and relates to a pressure compensation device suitable for electromechanical equipment for deep-sea operations or equipment with large internal and external pressure changes, especially pressure compensation of deep-sea operation equipment. Background Art
[0002] At present, when many deep-sea operation equipment are working, water cannot enter the equipment and the pressure difference between the inside and outside of the equipment is large. The equipment needs to withstand greater pressure. Due to multiple factors such as volume and structure, the equipment cannot meet higher pressure resistance requirements. Generally, it is necessary to fill the inside of the equipment with insulating lubricating oil and use a pressure compensation device to achieve pressure balance inside and outside the equipment to avoid equipment damage.
[0003] The traditional pressure compensation device is composed of several parts such as a spring, an airbag, and a shell. The compensation volume is limited by the spring pressure and is generally a fixed value. The compensation volume cannot be adjusted. The traditional pressure compensation device needs to be installed outside the equipment and connected to the equipment through pipes. There are many sealing surfaces and the risk of leakage is greater. At the same time, the spring is also at risk of corrosion and failure, which may cause the pressure compensator to fail and cause equipment damage. Summary of the invention
[0004] The object of the present invention is to provide a pressure compensation device with improved reliability and service life, and to enhance the adaptability and working range of the equipment to be compensated through optimized structural design.
[0005] The technical solution adopted by the present invention to solve its technical problems is: a pressure compensation device, including a connecting cavity and an airbag shell installed at the left and right ends of the connecting cavity, an inflation pressure regulating valve is arranged on the connecting cavity, and a sealed airbag is arranged in the two airbag shells. One end of the airbag shell is sealed with the connecting cavity through a sealing surface at the edge of the sealing airbag, so that a pressure cavity is formed between the connecting cavity in the middle part and the sealed airbags at both ends, and the pressure of the pressure cavity is pre-filled and adjusted by the inflation pressure regulating valve on the side of the pressure cavity. An orifice plate is installed at the opening at one end, and the maximum volume of the single-sided sealed airbag in a static state is greater than the sum of the volume of the connecting cavity and the volume of the airbag shell.
[0006] In the pressure compensation device, flanges are provided at one end of the airbag shell and at both ends of the connecting cavity, and the flanges are fastened and connected by fasteners.
[0007] The beneficial effects of the present invention are as follows: the present invention uses two sealed airbags and a connecting cavity to form a pressure cavity, and adjusts the compensation volume by adjusting the internal pressure of the pressure cavity. The external pressure and internal pressure of the device to be compensated are transmitted through the orifice plate at the end of the airbag shell, so as to achieve smooth internal and external pressures of the device and avoid damage to the device caused by high pressure. The present invention can meet the changing requirements of different compensation volumes of the device to be compensated. The device to be compensated using the pressure compensation device of the present invention can optimize the device structure design and improve the reliability and service life of the device to be compensated. Compared with traditional pressure compensators, the present invention has a simple structure, is safe and reliable, and maintenance-free, has better adaptability, and has important economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the device after pre-charging pressure of the present invention.
[0009] The figures are marked as follows: 1—orifice plate, 2—airbag housing, 3—sealed airbag, 4—connecting cavity, 5—inflatable pressure regulating valve, 6—fastener, 7—equipment housing, 8—sealing gasket, 9—fastener, 10—equipment liquid filling area. DETAILED DESCRIPTION
[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0011] Reference Figure 1 , Figure 2 As shown, a pressure compensation device disclosed in the present invention is composed of several parts such as an orifice plate 1, an airbag shell 2, a sealed airbag 3, a connecting cavity 4, an air-charging pressure-regulating valve 5, and a fastener 6. The airbag shell 2 is installed at the left and right ends of the connecting cavity 4, and an air-charging pressure-regulating valve 5 is provided on the connecting cavity 4. The two airbag shells 2 are both provided with sealed airbags 3. One end of the airbag shell 2 is sealed with the connecting cavity 4 through the sealing surface at the edge of the sealing airbag 3, so that a pressure cavity is formed between the connecting cavity 4 in the middle part and the sealed airbags 2 at both ends. The pressure of the pressure cavity is pre-charged and adjusted through the air-charging pressure-regulating valve 5 on the side of the pressure cavity. The orifice plate 1 is installed at the opening of one end. In a static state, the maximum volume of the single-side sealed airbag 3 is greater than the sum of the volume of the connecting cavity 4 and the volume of the airbag shell 2.
[0012] Flanges are provided at one end of the airbag housing 2 and at both ends of the connecting cavity 4, and the flanges are fastened and connected by fasteners 6. When the pressure compensation device of the present invention is used, the device housing 7 of the device to be compensated is connected to the flange of the airbag housing 2 at one end through a sealing gasket 8 and a fastener 9. By adjusting the pre-charge pressure in the pressure cavity and the pre-charge pressure of the liquid in the device filling area 10, the volume compensation of the device to be compensated after being pressurized is achieved. When the external pressure of the device changes, the pre-charge pressure of the liquid in the device should be greater than the pre-charge pressure in the pressure cavity. The liquid inside the device can enter the airbag housing 2 through the orifice plate 1, and the external pressure is transmitted and squeezes the sealed airbag 3, and the volume of the pressure cavity changes. The device to be compensated transmits the external pressure to the inside of the device, and the pressure balance between the inside and outside of the device is achieved, thereby achieving the purpose of pressure compensation.
[0013] The sealed airbag 3 is also in a folded state when inflated. The volume of the sealed airbag 3 is greater than that of the airbag shell 2 under static conditions, so the pressure in the pressure chamber will not directly act on the sealed airbag 3, which improves the anti-fatigue properties of the airbag and the reliability of the equipment. Moreover, the left and right sealed airbags 3 form two sealing surfaces. Even if one airbag ruptures, the other airbag still has the function of pressure supplementation through its own movement. The internal pressure of the equipment to be compensated acts on the sealed airbag 3 through the orifice plate 1 at the other end, and the transmission of pressure changes can be achieved through the change of the shape of the airbag rather than through expansion and compression. There is no mechanical fatigue problem, it has good adaptability, and it has the characteristics of flexible structural layout, safety and reliability, and high cooling efficiency. Through the two airbags in contact with the external and internal liquids respectively, as long as the chemical compatibility of the airbag and the medium meets the requirements, there will be no metal corrosion problems, such as the corrosion of metal springs in seawater.
[0014] Example 1: The volume of the connecting cavity 4 is 2L, the volume of the airbag shell 2 is 1.5L, the sum of the volumes of the sealed airbag 3 and the connecting cavity 4 is 3.5L, the static volume of the sealed airbag 3 is 3.5L, but the maximum volume of the sealed airbag 3 is greater than 3.5L. When in use, the internal pre-charge pressure between the two sealed airbags 3 is 0.1MPa. After the two sealed airbags 3 are expanded, they fill the entire cavity, with a total volume of 5L. The internal filling pressure of the device to be compensated is 0.2MPa. Assuming that the temperature remains unchanged, according to the ideal gas state equation, the volume of the sealed airbag 3 is V=3.33L at this time. The volume of the liquid inside the device to be compensated that enters the pressure compensation device is 1.67L, and the compensation volume of the volume compensator is 1.67L at this time. During the diving process of the device in the marine environment, the external pressure gradually increases, the volume of the pressure cavity of the pressure compensation device gradually decreases, and the pressure inside the device gradually increases. When the device dives to a depth of 500m, the external pressure of the device is 5MPa, and the volume of the pressure chamber is V2=0.196L. When the sealing airbag 3 is compressed, only the shape of the airbag changes, and there is no elastic deformation. As long as the volume change value of the device to be compensated under high pressure is less than 1.67L, the device can achieve internal and external pressure balance under high pressure through the pressure compensation device of this patent.
[0015] Example 2: The volume of the connecting cavity 4 is 2L, the volume of the airbag shell 2 is 1.5L, the static volume of the sealed airbag 3 is 3.5L, the sum of the volumes of the left and right sealed airbags 3 and the connecting cavity 4 is 5L, the internal pre-charge pressure of a single sealed airbag 3 is 0.05MPa, and the internal filling pressure of the device to be compensated is 0.2MPa. Assuming that the temperature remains unchanged, according to the ideal gas state equation, the volume of the sealed airbag 3 is V=2.5L, and the volume of the liquid inside the device to be compensated entering the pressure compensation device is 2.5L. At this time, the compensation volume of the pressure compensation device is 2.5L.
[0016] The above embodiments are only illustrative of the principles and effects of the present invention, as well as some embodiments of its application. For those skilled in the art, several modifications and improvements may be made without departing from the creative concept of the present invention, and all of these belong to the protection scope of the present invention.
Claims
1. A pressure compensation device, characterized in that: The invention comprises a connecting cavity (4) and an airbag shell (2) mounted at both ends of the connecting cavity (4); an inflation pressure regulating valve (5) is arranged on the connecting cavity (4); a sealing airbag (3) is arranged in the airbag shell (2); one end of the airbag shell (2) is sealed with the connecting cavity (4) by the sealing airbag (3); an orifice plate (1) is mounted at the opening of one end; and the maximum volume of the sealing airbag (3) is greater than the sum of the volume of the connecting cavity (4) and the volume of the airbag shell (2) at one end.
2. A pressure compensation device according to claim 1, characterized in that: Flanges are provided at one end of the airbag housing (2) and at both ends of the connecting cavity (4), and the flanges are fastened and connected via fasteners (6).