CN204420101U - A kind of sealing configuration of ultrahigh pressure vessel self intensification - Google Patents

Abstract

The utility model relates to a self-reinforcing sealing structure of an ultra-high pressure vessel, which belongs to the technical field of self-reinforcement of an ultra-high pressure vessel. The sealing structure includes an ultra-high pressure container body, a sealing plug, a pre-tightening screw plug and a pre-tightening cone rod. The body of the ultra-high pressure vessel is provided with through holes A, B, C and D in a cross shape; the sealing plug in the through hole D is provided with a pre-tightened cone rod, and the pre-tightened cone rod is threaded with a The pre-tightening screw plug is provided with an external thread, and the pre-tightening screw plug is threadedly connected with the body of the ultra-high pressure vessel through the external thread. The sealing structure overcomes the shortcomings and deficiencies of the prior art, can ensure sealing reliability under ultra-high pressure, and has the characteristics of convenient installation and good pre-tightening effect.

Description

A self-reinforced sealing structure for ultra-high pressure vessels

technical field

The utility model relates to a self-reinforcing sealing structure of an ultra-high pressure vessel, which belongs to the technical field of self-reinforcement of an ultra-high pressure vessel.

Background technique

With the rapid development of modern industrial technology, ultra-high pressure vessels are used more and more widely in chemical industry, petrochemical industry, powder metallurgy and other fields. Under normal working conditions, the inner cavity of the ultra-high pressure vessel bears a relatively high pressure, generally reaching above 100 MPa. How to ensure the improvement of the carrying capacity of the pressure vessel under ultra-high internal pressure has always been a research hotspot. According to the conventional elastic design theory, only increasing the wall thickness of the vessel is limited to improve the yield bearing capacity of the ultra-high pressure vessel, which will easily lead to uneven distribution of stress along the wall thickness direction, reducing the utilization rate and bearing capacity of the vessel structural materials , and at the same time, the phenomenon of stress concentration near the wall of the inner cavity or at the structural mutation is obvious, which promotes the growth of fatigue cracks on the inner wall.

Self-reinforcement treatment is an effective measure to improve the carrying capacity and life of ultra-high pressure vessels. Its essence is to apply an internal pressure much higher than the working pressure on the ultra-high pressure vessel before service, so that the inner layer material will be under the action of ultra-high pressure liquid. Plastic deformation occurs, while the outer layer material is still in the elastic deformation stage. After the internal high pressure is removed, the outer layer material compresses the inner layer material, causing residual compressive stress on the surface of the inner cavity. The existence of residual compressive stress can partially offset the influence of the medium pressure in the inner cavity of the ultra-high pressure vessel of the pump, so that the overall stress distribution of the ultra-high pressure vessel is more uniform, especially the stress concentration in the ultra-high pressure vessel can be improved, thereby making the ultra-high pressure The fatigue strength of the container can be greatly improved.

The use of liquid pressurization is a more common pressurization method in the self-reinforcing treatment of ultra-high pressure vessels, that is, all the through holes of ultra-high pressure vessels are sealed, and high-pressure liquid is injected into the interior. On the one hand, in order to achieve the effect after self-reinforcement treatment, the high-pressure liquid needs to have sufficient pressure holding time in the ultra-high pressure container to ensure that the inner cavity is fully deformed. Due to the high self-reinforcement pressure, the diameter of the liquid pipeline applying pressure in the container is small , so that a slight leak inside the container will lead to a sharp drop in pressure, so the self-reinforcing treatment has strict requirements on the sealing effect of the sealing surface. Seals and flat gaskets mainly rely on a certain contact pressure between the sealed element and the seal to achieve the sealing effect. However, due to the increase in pressure, it is easy to cause deformation of the equipment and fasteners, reducing the contact pressure and affecting the entire seal. The effect is greatly affected, and the semi-self-tightening seal such as the double-cone ring seal itself has a certain degree of self-tightening, but as the pressure increases, due to its structural characteristics, the contact between the sealing element and the sealed element The pressure has been reduced, but a larger preload is still required in practice. Therefore, choosing a suitable sealing device is the key factor to determine whether the self-reinforcing treatment of ultra-high pressure vessels can be successful.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art for the self-reinforcing technology of ultra-high pressure vessels, to provide a super-high-pressure seal that can ensure the reliability of the seal under ultra-high pressure, and has the advantages of convenient installation and good pre-tightening effect. Self-reinforced sealing structure for high-pressure vessels.

The utility model realizes above-mentioned purpose through following technical scheme:

A self-reinforced sealing structure for an ultra-high pressure vessel, comprising a body of the ultra-high pressure vessel, a sealing plug, a pre-tightened screw plug and a pre-tightened cone rod, characterized in that: the body of the ultra-high pressure vessel is provided with a cross-shaped through-hole A, a through-hole Hole B, through hole C and through hole D; through hole A, through hole B, through hole C and through hole D are respectively equipped with sealing plugs, and the sealing plugs on the outside of through hole A, through hole B and through hole C A sealing clamp is installed on the top through the annular groove, and a pre-tightening cone rod is installed on the sealing plug in the through hole D through the pre-tightening cone rod hole, and a pre-tightening screw plug is installed on the thread of the pre-tightening An external thread is provided, and the pre-tightened screw plug is threadedly connected with the body of the ultra-high pressure vessel through the external thread.

The said through hole A, through hole B, through hole C and through hole D are tapered holes respectively.

The sealing plug is conical.

The sealing plug in the through hole A is provided with a pressing hole.

The sealing plug in the through hole D is a three-piece combined split type, and the joint end surfaces of the three combined split-type sealing plugs are respectively provided with occlusal lines, and there are interlocking lines between the occlusal lines. Corrugated rubber pad.

The sealing clamp block is arc-shaped, and the lower end surface of the sealing clamp block is oblique; the sealing clamp block is inserted into the sealing plug through the cooperation of the oblique lower end surface and the annular groove.

The beneficial effects of the utility model are:

1. The self-reinforced sealing structure of the ultra-high pressure vessel has a conical hard seal on each sealing surface. The higher the hydraulic pressure in the inner cavity of the ultra-high pressure vessel, the greater the pressure on the sealing surface, which can ensure the sealing reliability under ultra-high pressure;

2. The self-reinforced sealing structure of the ultra-high pressure vessel uses a sealing clamp to control the initial sealing pretightening force of the sealing plug installed to ensure the sealing performance of each sealing surface under low pressure or no pressure. When the end gradually approaches the inner side of the annular groove at the end of the plug along the radial distance, the pre-tightening force increases, otherwise it decreases;

3. The self-reinforcing sealing structure of the ultra-high pressure vessel adopts the thread cooperation between the pre-tightening screw plug and the pre-tightening cone rod, so that the pre-tightening cone rod generates an outward axial force, and the pre-tightening cone rod is combined with three pieces The conical surface of the sealing plug cooperates to make the three combined split sealing plugs generate an initial pre-tightening force. The pre-tightening operation is simple and convenient, and it is easy to ensure that the inner and outer tapered surfaces at the right through hole are under low pressure or no pressure. Has good sealing;

4. The self-reinforcing sealing structure of the ultra-high pressure vessel can be decomposed into axial and radial components through the sealing fluid pressure of the cone surface, reducing the local stress near the sealing surface, and effectively protecting the material and inner diameter cylindricity of the ultra-high pressure vessel ;

5. The self-reinforced sealing structure of the ultra-high pressure vessel adopts two sections of different types of sealing thread grooves on the bonding surface of the three combined split sealing plugs. The type of the thread grooves can be changed according to the size of the hydraulic pressure. The width and depth of the groove , Use corrugated rubber pads between the threaded grooves near the inner cavity of the ultra-high pressure vessel to ensure the sealing surface of the threaded grooves under low pressure.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the assembly structure of the sealing clamp of the present invention;

Fig. 3 is a right-view structure schematic diagram of three combined split sealing plugs;

Fig. 4 is a schematic diagram of the structure of Fig. 3A-A.

In the figure: 1. Ultra-high pressure vessel body; 2. Sealing plug; 3. Sealing clip; 4. Pre-tightened screw plug; 5. Pre-tightened cone rod; 6. Corrugated rubber pad; 7. Through hole A, 8. Through hole B, 9, through hole C, 10, through hole D, 11, pressure hole, 12, bite pattern, 13, annular groove, 14, pre-tightened taper rod hole.

Detailed ways

The self-reinforcing sealing structure of the ultra-high pressure vessel includes a body 1 of the ultra-high pressure vessel, a sealing plug 2 , a pre-tightening screw plug 4 and a pre-tightening cone rod 5 . The super high pressure vessel body 1 is provided with through holes A7, B8, C9 and D10 in a cross shape; the through holes A7, B8, C9 and D10 are tapered holes respectively. A tapered sealing plug 2 is installed in the through hole A7, the through hole B8, the through hole C9 and the through hole D10 respectively.

The sealing plug 2 in the through hole A7 is provided with a pressing hole 11 for injecting high-pressure liquid into the ultra-high pressure container body 1 . The sealing plug 2 outside the through hole A7, the through hole B8 and the through hole C9 is provided with an annular groove 13, and the sealing clamp 3 is installed on the sealing plug 2 through the annular groove 13. The sealing clip 3 is an arc-shaped body, and the lower end surface of the sealing clip 3 is oblique. The sealing clip 3 is movably inserted on the sealing plug 2 through the cooperation between the oblique lower end surface and the annular groove 13 . The role of the sealing clamp 3 is to apply an initial pre-tightening force to the sealing plug 2 . The magnitude of the initial pre-tightening force can be realized by controlling the moving distance of the sealing clamp 3 along the radial direction.

The sealing plug 2 in the through hole D10 is a three-piece combined split type, and the joint end surfaces of the three combined split-type sealing plugs 2 are respectively provided with occlusal lines 12 to ensure mutual contact. Close bite. A corrugated rubber pad 6 is provided on the bite line 12 adjacent to the big end of the sealing plug 2 .

The central part of the sealing plug 2 in the through hole D10 is provided with a tapered pre-tightening cone rod hole 14; the sealing plug 2 in the through hole D10 is equipped with a pre-tightening cone rod 5 through the pre-tightening cone rod hole 14, and the sealing plug A pre-tightening screw plug 4 is threaded on the pre-tightening taper rod 5 outside the head 2, and the pre-tightening screw plug 4 is provided with external threads, and the pre-tightening screw plug 4 is threadedly connected with the ultra-high pressure vessel body 1 through the external threads.

The diameter of the through hole D10 of the self-reinforced sealing structure of the ultra-high pressure vessel is larger than the major diameter of the tapered surfaces of the other three through holes. When assembling, the sealing plugs 2 of the other three through holes are put in through the through hole D10 in advance, And adjust the sealing plug 2 so that the annular groove 13 on the end exceeds the outer wall surface of the ultra-high pressure vessel body 1, then put the sealing clips 3 with inclined surfaces on both sides of the groove, and align the sealing clips 3 in the radial direction Force is applied to wedge the slope of the sealing clamp 3 into the annular groove 13 to achieve the effect of applying an initial pre-tightening force to the sealing plug 2 .

The sealing plug 2 in the through hole D10 of the self-reinforced sealing structure of the ultra-high pressure vessel adopts three combined split plugs. When assembling, after the completion of the other three through hole plugs, first put in the preloaded plug. Taper rod 5, then put corrugated rubber pad 6, and put them into the inner cavity of through hole D10 in turn, and adjust the positions of the three combined split plugs at the same time, so that the wavy occlusal lines 12 fit together , and then apply an axially outward force to the outer end of the pre-tightening cone rod 5 to ensure that the conical surface of the pre-tightening cone rod 5 and the conical surface of the three-piece combined split plug, the three-piece combined split type and the through hole D10 taper fit.

Under the premise of keeping the pre-tightening cone rod 5 tangentially non-rotating, install the pre-tightening screw plug 4, the inner ring of the pre-tightening screw plug 4 is threaded with the pre-tightening cone rod 5, and the outer ring is threaded with the ultra-high pressure vessel body 1, and the process is completed. For the axial positioning of the sealing plug 2, when the pre-tightening screw plug 4 is screwed into the outer end surface and the outer wall surface of the ultra-high pressure vessel body 1, continue to apply torque to the pre-tightening screw plug 4), at this time, the pre-tightening cone The rod 5 produces an axial pre-tightening force, so that all sealing surfaces of the through hole D10 form an initial seal.

During the self-reinforcement process of the ultra-high pressure container body 1 , high-pressure liquid is injected into the interior through the pressure hole 11 . Since each sealing surface of the self-reinforced sealing structure of the ultra-high pressure vessel is a conical hard seal, the higher the hydraulic pressure in the inner cavity of the ultra-high pressure vessel body 1, the greater the pressure on the sealing surface, so the sealing under ultra-high pressure can be ensured. reliability. In the low pressure or no pressure state, the sealing plug 2 of the through hole A7, the through hole B8 and the through hole C9 of the sealing structure is initially sealed by the sealing clamp 3, and the sealing plug 2 of the through hole D10 is provided by the pre-tightening screw. Plug 4 and pre-tightened cone rod 5 provide initial sealing pressure.

The self-reinforcing sealing structure of the ultra-high pressure container overcomes the shortcomings and deficiencies of the prior art, can ensure the sealing reliability under ultra-high pressure, and has the characteristics of convenient installation and good pre-tightening effect.

Claims (6)

1. A self-reinforced sealing structure for an ultra-high pressure vessel, including an ultra-high pressure vessel body (1), a sealing plug (2), a pre-tightening screw plug (4) and a pre-tightening cone rod (5), characterized in that: The high-pressure vessel body (1) is provided with through holes A (7), through holes B (8), through holes C (9) and through holes D (10) in a cross shape; through holes A (7), through holes B (8), the through hole C (9) and the through hole D (10) are respectively installed with sealing plugs (2), and the outer parts of the through hole A (7), the through hole B (8) and the through hole C (9) The sealing clamp (3) is installed on the sealing plug (2) through the annular groove (13), and the pre-tightening is installed on the sealing plug (2) in the through hole D (10) through the pre-tightening cone rod hole (14). Tapered rod (5), pre-tightening screw plug (4) is installed on the thread of pre-tightening taper rod (5), and external thread is arranged on the pre-tightening screw plug (4), and pre-tightening screw plug (4) passes through external thread and super The high pressure vessel body (1) is threaded. 2. A self-reinforced sealing structure for ultra-high pressure vessels according to claim 1, characterized in that: said through hole A (7), through hole B (8), through hole C (9) and through hole D(10) are tapered holes respectively. 3. A self-reinforcing sealing structure for an ultra-high pressure vessel according to claim 1, characterized in that: the sealing plug (2) is a cone. 4. A self-reinforcing sealing structure for an ultra-high pressure vessel according to claim 1, characterized in that: the sealing plug (2) in the through hole A (7) is provided with a pressure hole (11). 5. A self-reinforced sealing structure for ultra-high pressure vessels according to claim 1, characterized in that: the sealing plug (2) in the through hole D (10) is a three-piece combination split type, three The sealing plugs (2) of block combination split type are respectively provided with occlusal patterns (12) on the bonding end surfaces between the blocks, and corrugated rubber pads (6) are provided between the occlusal patterns (12). 6. A self-reinforcing sealing structure for an ultra-high pressure vessel according to claim 1, characterized in that: the sealing clamp (3) is arc-shaped, and the lower end surface of the sealing clamp (3) is oblique , the sealing clamp (3) is inserted and installed on the sealing plug (2) through the cooperation between the inclined lower end surface and the annular groove (13).