Pressure maintaining and volume compensating type underwater hydraulic joint protective cap

Abstract

The utility model discloses a pressure maintaining and volume compensating type underwater hydraulic connector protective cap which comprises a protective cap body, a first channel is formed in the protective cap body, a piston is arranged in the first channel in a sliding mode, a fixing base is arranged at one end of the first channel, and a pressure maintaining and volume compensating device is arranged at the other end of the first channel. A spring is arranged between the fixing base and the piston, a rubber pad is arranged at the end, away from the spring, of the fixing base, a through hole is formed in the rubber pad, and the through hole is communicated with the first channel through the fixing base so as to balance the internal pressure intensity and the external pressure intensity of the first channel. According to the pressure maintaining and volume compensating type underwater hydraulic connector protective cap, the through hole is communicated with the first channel through the fixing base so as to balance the pressure inside and outside the first channel, so that the pressure inside and outside the first channel can be balanced through the through hole in the process of being connected with or separated from a connector, and the connector can be conveniently connected with or separated from the connector; and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of underwater joints, and in particular relates to a pressure-maintaining volume-compensating underwater hydraulic joint protection cap. Background Art

[0002] The use of underwater production systems to develop marine oil and gas resources has become a mainstream model. In underwater production systems, underwater equipment such as underwater manifolds, underwater distribution units and underwater Christmas trees are all integrated with underwater multi-way hydraulic connector (MQC) fixed ends, and multiple underwater hydraulic male connectors are installed on the MQC fixed ends. Before the underwater equipment is connected to the hydraulic flying line, the MQC fixed end on the underwater equipment needs to be protected by an MQC long-term protection cap, and an underwater hydraulic male connector protection cap is installed on the MQC long-term protection cap, which is used to match and connect the underwater hydraulic male connector on the MQC fixed end. Underwater multi-way hydraulic connector (MQC) temporary positions are provided on the underwater Christmas tree and manifold, which are used for docking and connection of underwater liquid flying lines before they are officially installed and connected on the seabed. Both ends of the underwater liquid flying lines are MQC mobile ends, on which multiple underwater hydraulic female joints are installed. Underwater hydraulic female joint protection caps are installed on the MQC temporary positions. After the underwater liquid flying lines are connected to the MQC temporary positions, the female joints on the liquid flying lines are located on the female joint protection caps on the MQC temporary positions.

[0003] Existing underwater hydraulic female connector protection caps and male connector protection caps are required to withstand the external pressure of seawater and the internal pressure of the connector pipeline, ensure the matching sealing performance with the underwater hydraulic connector to prevent seawater from entering the connector, and ensure that when the protective cap is inserted or removed from the connector, the internal volume becomes smaller / larger during the insertion or removal process to avoid liquid lock or vacuum, resulting in difficulty in underwater insertion or removal.

[0004] Therefore, it is urgent to design a pressure-maintaining volume-compensating underwater hydraulic joint protective cap to solve the above-mentioned problem of difficulty in inserting or removing the joint and the protective cap underwater. Utility Model Content

[0005] In order to solve the technical problem mentioned in the background technology that the joint and the protective cap are difficult to insert or remove underwater, a pressure-maintaining volume compensation type underwater hydraulic joint protective cap is provided to solve the above problem.

[0006] In order to achieve the above-mentioned purpose, the specific technical scheme of the pressure-maintaining volume-compensating underwater hydraulic joint protection cap of the utility model is as follows:

[0007] A pressure-maintaining volume-compensating underwater hydraulic joint protective cap comprises a protective cap body, a first channel is opened on the protective cap body, a piston is slidably arranged in the first channel, a fixing seat is arranged at one end of the first channel, the other end of the first channel is plugged into or separated from the joint, a spring is arranged between the fixing seat and the piston, a rubber pad is arranged at the end of the fixing seat away from the spring, a through hole is arranged on the rubber pad, and the through hole is connected to the first channel through the fixing seat to balance the pressure inside and outside the first channel.

[0008] Furthermore, a first step is arranged in the first channel, a first boss is arranged on the piston, and the first boss slides between the fixing seat and the first step.

[0009] Furthermore, a second step is provided in the first channel, and the fixing seat abuts against the second step.

[0010] Furthermore, a second channel is opened on the fixed seat, the second channel is connected to the first channel, a third step is arranged on the inner wall of the second channel, a connecting column is arranged on one end of the piston close to the spring, one end of the spring abuts against the third step, and the other end of the spring is sleeved on the connecting column.

[0011] Furthermore, a retaining ring is included, which is arranged in the second channel and is used to fix the rubber pad on the side of the third step away from the spring.

[0012] Furthermore, it also includes a first sealing ring. The inner wall of the first channel is provided with a first sealing groove. The first sealing ring is arranged in the first sealing groove. The first sealing ring abuts against the side wall of the piston.

[0013] Furthermore, it also includes a second sealing ring. The inner wall of the first channel is provided with a second sealing groove, the second sealing groove is arranged at one end of the first channel away from the fixing seat, the second sealing ring is arranged in the second sealing groove, and the second sealing ring abuts against the side wall of the joint.

[0014] Furthermore, it also includes a third sealing ring. The outer wall of the first channel is provided with a third sealing groove, the third sealing groove is arranged at one end of the first channel away from the fixing seat, the third sealing ring is arranged in the third sealing groove, and the third sealing ring abuts against the side wall of the joint.

[0015] Furthermore, it also includes a fourth sealing ring, which is arranged between the inner wall of the first channel and the fixing seat.

[0016] Furthermore, an arc-shaped bell mouth is provided at one end of the first channel away from the fixing seat.

[0017] The pressure-maintaining volume-compensating underwater hydraulic joint protection cap of the utility model has the following advantages:

[0018] A piston is slidably arranged in the first channel, a fixed seat is arranged at one end of the first channel, the other end of the first channel is connected to or separated from the joint, a spring is arranged between the fixed seat and the piston, a rubber pad is arranged at the end of the fixed seat away from the spring, a through hole is arranged on the rubber pad, and the through hole is connected to the first channel through the fixed seat to balance the pressure inside and outside the first channel, so that in the process of connecting or separating with the joint, the pressure inside and outside the first channel is balanced through the through hole, which facilitates the connection or separation with the joint and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the male joint of the pressure-maintaining volume-compensating underwater hydraulic joint protection cap of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the protective cap body of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the male connector and the protective cap body of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the piston of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the fixing seat of the utility model;

[0024] Figure 6 It is a structural schematic diagram of the female joint of the pressure-maintaining volume-compensating underwater hydraulic joint protection cap of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the female connector and the protective cap body of the utility model.

[0026] Description of the markings in the figure:

[0027] 1. Protective cap body; 11. First channel; 111. First step; 112. Second step; 12. Bell mouth; 13. Fourth step; 2. Piston; 21. First boss; 22. Connecting column; 3. Fixed seat; 31. Second channel; 32. Third step; 4. Spring; 5. Rubber pad; 6. First sealing ring; 7. Second sealing ring; 8. Third sealing ring; 9. Fourth sealing ring; 10. Retaining ring; 100. Joint; 101. Retaining ring; 102. Spiral retaining ring; 103. Mounting plate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0029] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0030] Please refer to the attached Figure 1 To Attachment Figure 7 The utility model is described as a pressure-maintaining volume-compensating underwater hydraulic joint protection cap.

[0031] like Figures 1 to 7 As shown, the pressure-maintaining volume-compensating underwater hydraulic joint protective cap in the utility model comprises a protective cap body 1, a first channel 11 is provided on the protective cap body 1, a piston 2 is slidably arranged in the first channel 11, a fixing seat 3 is arranged at one end of the first channel 11, the other end of the first channel 11 is plugged into or separated from the joint 100, a spring 4 is arranged between the fixing seat 3 and the piston 2, a rubber pad 5 is arranged at one end of the fixing seat 3 away from the spring 4, a through hole is arranged on the rubber pad 5, and the through hole is connected to the first channel 11 through the fixing seat 3 to balance the internal and external pressures of the first channel 11. In this embodiment, the spring 4 is connected between the fixing seat 3 and the piston 2, and can slow down the movement speed of the piston 2 under internal or external pressure, especially when the pressure changes suddenly, and slow down the impact on the protective cap of the joint 100. The through hole on the rubber pad 5 is a very small hole. When there is no internal and external pressure difference, the through hole can isolate the first channel 11 from the external seawater. Only when there is an internal and external pressure difference can the seawater enter or be discharged. The through hole can also be a scratch on the rubber pad 5, as long as the internal and external pressure difference can be balanced. In this embodiment, the joint 100 includes a male joint and a female joint, and both the male joint and the female joint are protected by a pressure-maintaining volume compensation type underwater hydraulic joint protection cap.

[0032] A piston 2 is slidably arranged in the first channel 11, a fixing seat 3 is arranged at one end of the first channel 11, and the other end of the first channel 11 is connected or separated from the joint 100. A spring 4 is arranged between the fixing seat 3 and the piston 2, and a rubber pad 5 is arranged at the end of the fixing seat 3 away from the spring 4. A through hole is arranged on the rubber pad 5, and the through hole is connected to the first channel 11 through the fixing seat 3 to balance the pressure inside and outside the first channel 11, so that the joint 100 protective cap body 1 can balance the pressure inside and outside the first channel 11 through the through hole during the process of plugging or separating with the joint 100, which is convenient for plugging or separating with the joint 100 and improves work efficiency. In this embodiment, a through hole is opened on the rubber pad 5, which is convenient for achieving the balance of the pressure inside and outside the first channel 11, and can also prevent pollutants or marine organisms from entering between the fixing seat 3 and the piston 2, affecting the normal use of the pressure-maintaining volume compensation type underwater hydraulic joint protective cap.

[0033] Further, if Figures 1 to 5 As shown, a first step 111 is provided in the first channel 11, and a first boss 21 is provided on the piston 2, and the first boss 21 slides between the fixing seat 3 and the first step 111. By providing the first step 111, the first boss 21 is limited between the fixing seat 3 and the first step 111, that is, the range of motion of the piston 2 is limited between the fixing seat 3 and the first step 111. During the plugging process of the protective cap body 1 and the joint 100, the piston 2 moves between the fixing seat 3 and the first step 111, avoiding the problem of liquid lock caused by the reduction of the internal volume during the insertion process, resulting in the inability to effectively insert the joint 100, achieving the balance between the external pressure and the internal pressure of the protective cap body 1, and effectively reducing the resistance to the insertion or extraction of the joint 100. The pressure-maintaining volume compensation type underwater hydraulic joint protective cap in the utility model also includes a first sealing ring 6, and a first sealing groove is provided on the inner wall of the first channel 11. The first sealing ring 6 is arranged in the first sealing groove, and the first sealing ring 6 abuts against the side wall of the piston 2. The piston 2 divides the first channel 11 into two parts. Both parts are filled with seawater. The seawater between the two parts is not connected and is divided by the piston 2.

[0034] Further, if Figures 1 to 5As shown, when the joint 100 is a male joint, when the joint 100 is plugged into the protective cap body 1, the joint 100 is plugged into the first channel 11 of the protective cap to prevent seawater from entering the interior of the joint 100. The pressure-maintaining volume compensation type underwater hydraulic joint protective cap in the utility model also includes a second sealing ring 7. A second sealing groove is provided on the inner wall of the first channel 11. The second sealing groove is arranged at one end of the first channel 11 away from the fixing seat 3. The second sealing ring 7 is arranged in the second sealing groove. The second sealing ring 7 abuts against the side wall of the joint 100. By setting the second sealing ring 7, when the joint 100 is plugged into the protective cap body 1, the piston 2 is sealed by the first sealing ring 6, and the joint 100 is sealed by the second sealing ring 7, so that the sealed inner cavity formed between the piston 2 and the joint 100, the seawater in the inner cavity is sealed by the second sealing ring 7, which can prevent the seawater between the piston 2 and the joint 100 from entering the interior of the joint 100. In this embodiment, the first sealing ring 6 and the second sealing ring 7 can withstand high external pressure and internal pressure, and prevent seawater from entering the joint 100 and the leakage of the internal medium of the joint 100.

[0035] Further, if Figure 6 and 7 As shown, when the connector 100 is a female connector, when the connector 100 is plugged into the protective cap body 1, the protective cap body 1 is plugged into the connector 100, in order to prevent seawater from entering the interior of the connector 100. The pressure-maintaining volume compensation type underwater hydraulic connector protective cap in the utility model also includes a third sealing ring 8, a third sealing groove is provided on the outer wall of the first channel 11, the third sealing groove is arranged on the outer wall of the protective cap body 1 at one end away from the fixing seat 3, the third sealing ring 8 is arranged in the third sealing groove, and the third sealing ring 8 abuts against the side wall of the connector 100. By setting the third sealing ring 8, when the connector 100 is plugged into the protective cap body 1, the piston 2 is sealed by the first sealing ring 6, and the connector 100 is sealed by the third sealing ring 8, so that the sealed inner cavity formed between the piston 2 and the connector 100, the seawater in the inner cavity and the external seawater are sealed by the third sealing ring 8, which can prevent the seawater between the piston 2 and the connector 100 or the external seawater from entering the interior of the connector 100. In this embodiment, the third sealing ring 8 can withstand high external pressure and internal pressure, and prevent seawater from entering the joint 100 and the leakage of the internal medium of the joint 100.

[0036] Further, if Figures 1 to 7As shown, a second channel 31 is opened on the fixing seat 3, and the second channel 31 is connected to the first channel 11. A third step 32 is arranged on the inner wall of the second channel 31. A connecting column 22 is arranged on one end of the piston 2 close to the spring 4. One end of the spring 4 abuts against the third step 32, and the other end of the spring 4 is sleeved on the connecting column 22. When the connector 100 is plugged into the protective cap body 1, the connector 100 gradually approaches the piston 2, and the seawater between the connector 100 and the piston 2 pushes the piston 2 to move toward the direction close to the fixing seat 3, the spring 4 is compressed, and at the same time, the seawater between the piston 2 and the fixing seat 3 will be pushed out and discharged from the through hole of the rubber pad 5, balancing the pressure inside and outside the first channel 11, so that the connector 100 is convenient for being plugged into the protective cap body 1; when the connector 100 is separated from the protective cap body 1, the connector 100 gradually moves away from the piston 2, and the piston 2 gradually moves away from the fixing seat 3 under the action of the elastic force of the spring 4. At the same time, the pressure between the piston 2 and the fixing seat 3 is less than the external pressure of the first channel 11, and the seawater is sucked between the piston 2 and the fixing seat 3 from the through hole. The seawater and the spring 4 jointly push the piston 2 to move toward the direction close to the connector 100, and the seawater between the connector 100 and the piston 2 continuously pushes the connector 100, so that the connector 100 is convenient for being separated from the protective cap body 1.

[0037] Further, if Figures 1 to 7 As shown, the first channel 11 is also provided with a second step 112, and the fixing seat 3 abuts against the second step 112. The fixing seat 3 is detachably connected to one end of the protective cap body 1, and the fixing seat 3 and the protective cap body 1 can be fixed by bolt connection or by snap-fit ​​connection, as long as the fixing seat 3 can be fixed on the protective cap body 1. The pressure-maintaining volume compensation type underwater hydraulic joint protective cap in the utility model also includes a fourth sealing ring 9, which is arranged between the inner wall of the first channel 11 and the fixing seat 3. By arranging the fourth sealing ring 9, a sealing effect is played, so that a sealed inner cavity is formed between the piston 2, the first sealing ring 6, the rubber pad 5, the fixing seat 3 and the fourth sealing ring 9. In the case of a pressure difference, seawater can only flow out or be sucked in from the through hole of the rubber pad 5 to balance the internal and external pressure difference and prevent seawater from flowing between the outer wall of the fixing seat 3 and the first channel 11.

[0038] Further, if Figures 1 to 7 As shown, the pressure-maintaining volume-compensating underwater hydraulic joint protective cap of the utility model further includes a retaining ring 10, which is arranged in the second channel 31 and is used to fix the rubber pad 5 on the side of the third step 32 away from the spring 4. A groove is arranged in the second channel 31, and the retaining ring 10 is restricted in the groove to achieve fixed blocking of the rubber pad 5, and the rubber pad 5 is fixed in the second channel 31, and a gasket is also arranged between the retaining ring 10 and the rubber pad 5.

[0039] Further, if Figures 1 to 5As shown, an arc-shaped bell mouth 12 is provided at one end of the first channel 11 away from the fixing seat 3 , and the bell mouth 12 is provided to facilitate the connector 100 to be plugged into the first channel 11 .

[0040] Further, if Figure 1 As shown, the pressure-maintaining volume-compensating underwater hydraulic joint protective cap in the utility model also includes a retaining ring 101 and a spiral retaining ring 102. The retaining ring 101 and the spiral retaining ring 102 are sleeved outside the protective cap body 1. A fourth step 13 is provided on the outer side of the protective cap body 1. By providing the retaining ring 101 and the fourth step 13, the protective cap body 1 can be installed on the mounting plate 103. One side of the mounting plate 103 abuts against the retaining ring 101, and the other side of the mounting plate 103 abuts against the fourth step 13, thereby realizing the installation and positioning of the protective cap body 1.

[0041] The working principle of the pressure-maintaining volume-compensating underwater hydraulic joint protection cap in the utility model is as follows:

[0042] The piston 2 is movably arranged in the first channel 11 of the protective cap body 1. When the joint 100 is inserted into the protective cap body 1, the inner cavity between the piston 2 and the joint 100 is filled with seawater, and the inner cavity pressure between the piston 2 and the joint 100 gradually increases. When the inner cavity pressure is greater than the external pressure of the seawater and the resistance of the spring 4, the piston 2 will move away from the joint 100, and the spring 4 will be compressed. At the same time, the inner cavity volume between the piston 2 and the rubber pad 5 will gradually decrease, and the space between the piston 2 and the rubber pad 5 will also be filled with seawater. The inner cavity pressure increases, and the seawater between the piston 2 and the rubber pad 5 will be discharged through the through hole, and the balance The inner cavity pressure is balanced to facilitate the insertion of the connector 100 into the first channel 11; when the connector 100 is separated from the protective cap body 1, the inner cavity pressure between the piston 2 and the connector 100 gradually decreases. When the inner cavity pressure is less than the external pressure of seawater and the resistance of the spring 4, the piston 2 will move toward the connector 100. At the same time, the spring 4 releases elastic potential energy, and the inner cavity volume between the piston 2 and the rubber pad 5 gradually increases, and the inner cavity pressure decreases. The seawater outside the piston 2 and the rubber pad 5 will be sucked between the piston 2 and the rubber pad 5 through the through hole to balance the inner cavity pressure, making it easier for the connector 100 to be separated from the protective cap body 1.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pressure-maintaining volume-compensating underwater hydraulic joint protective cap, characterized in that: It includes a protective cap body, a first channel is opened on the protective cap body, a piston is slidably arranged in the first channel, a fixed seat is arranged at one end of the first channel, the other end of the first channel is plugged into or separated from the joint, a spring is arranged between the fixed seat and the piston, a rubber pad is arranged at the end of the fixed seat away from the spring, a through hole is arranged on the rubber pad, and the through hole is connected with the first channel through the fixed seat to balance the pressure inside and outside the first channel.

2. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 1, characterized in that: A first step is arranged in the first channel, a first boss is arranged on the piston, and the first boss slides between the fixing seat and the first step.

3. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 2, characterized in that: The first channel is also provided with a second step, and the fixing seat abuts against the second step.

4. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 1, characterized in that: A second channel is provided on the fixing seat, the second channel is connected with the first channel, a third step is provided on the inner wall of the second channel, a connecting column is provided on one end of the piston close to the spring, one end of the spring abuts against the third step, and the other end of the spring is sleeved on the connecting column.

5. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 4, characterized in that: The utility model also comprises a retaining ring, which is arranged in the second channel and is used for fixing the rubber pad on the side of the third step away from the spring.

6. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 1, characterized in that: It also includes a first sealing ring. The inner wall of the first channel is provided with a first sealing groove. The first sealing ring is arranged in the first sealing groove. The first sealing ring abuts against the side wall of the piston.

7. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 6, characterized in that: It also includes a second sealing ring. The inner wall of the first channel is provided with a second sealing groove, which is arranged at one end of the first channel away from the fixing seat. The second sealing ring is arranged in the second sealing groove, and the second sealing ring abuts against the side wall of the joint.

8. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 6, characterized in that: It also includes a third sealing ring. The outer wall of the first channel is provided with a third sealing groove, which is arranged at one end of the first channel away from the fixing seat. The third sealing ring is arranged in the third sealing groove, and the third sealing ring abuts against the side wall of the joint.

9. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 7 or 8, characterized in that: It also includes a fourth sealing ring, which is arranged between the inner wall of the first channel and the fixing seat.

10. The pressure-retaining volume-compensating underwater hydraulic joint protection cap according to claim 1, characterized in that: An arc-shaped bell mouth is arranged at one end of the first channel away from the fixing seat.

Images