A gas cylinder sealing structure with fully wrapped polymer liner fiber

Abstract

The present invention discloses a gas cylinder sealing structure with a polymer liner and fully wrapped fibers, comprising a polymer liner, a metal valve seat, a cylinder fiber wrapping layer, and a metal liner ring. The metal valve seat is installed at the bottle mouth of the polymer liner, the cylinder fiber wrapping layer is coated on the bottom base of the polymer liner and the metal valve seat, an internal thread is provided in the metal valve seat, an external thread is provided on the outside of the metal liner ring, the metal valve seat is threadedly connected to the external thread of the metal liner ring via the internal thread, and after the metal liner ring is threadedly tightened, the bottom end face of the metal liner ring strongly squeezes the end face of the bottle mouth of the polymer liner to seal. The metal liner ring of the present invention is threadedly tightened with the polymer liner to achieve sealing by the strong squeezing effect of the end face, and the sealing structure has a self-tightening sealing effect and is easy to install. At the same time, a saddle screw is used between the metal liner ring and the metal valve seat to prevent the metal liner ring thread from loosening, thereby improving the reliability of the sealing structure.

Description

Technical Field

[0001] The present invention relates to the field of composite material pressure vessel sealing structures, and in particular to a polymer material liner fiber fully wrapped gas cylinder sealing structure. Background Art

[0002] Hydrogen energy, with its diverse sources, efficient utilization, clean and environmentally friendly design, and wide application, has become a key direction in the global energy transition and upgrade. my country is also actively developing its hydrogen energy industry. The hydrogen energy industry chain encompasses hydrogen production, storage, transportation, and use. Hydrogen storage and transportation are key links connecting the upstream and downstream of the industry chain. High-pressure hydrogen storage and transportation equipment refers to high-pressure equipment used for hydrogen storage and transportation, including stationary high-pressure hydrogen storage vessels and high-pressure hydrogen cylinders. High-pressure cylinders can be categorized as pure metal cylinders (Type I), cylinders with metal liner and fiber wrapped around the circumference (Type II), cylinders with aluminum alloy liner and fiber wrapped around the lining (Type III), and cylinders with polymer liner and fiber wrapped around the lining (Type IV). Type IV cylinders are particularly popular in applications such as hydrogen fuel cell vehicles due to their light weight and high hydrogen storage density, presenting broad application prospects. The sealing technology for Type IV cylinders, which is crucial for their safety under high-pressure conditions, is one of the technical challenges hindering their production in my country.

[0003] The following domestic patent currently exists: CN 110107798 A, "A Plastic Liner Carbon Fiber Fully Wrapped Hydrogen Storage Cylinder Mouth Structure." This patent employs an O-ring between the plastic liner mouth and the metal annular liner to achieve sealing. However, the O-ring's sealing performance requires high dimensional accuracy for the plastic liner mouth, resulting in low reliability. Therefore, a new sealing structure with a simple structure, easy installation, and high reliability is urgently needed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a gas cylinder sealing structure with a polymer material liner fiber fully wrapped around it, the purpose of which is to achieve the sealing of the high-pressure gas cylinder mouth with a polymer material liner fiber wrapped around it, thereby improving the reliability of the gas cylinder sealing structure.

[0005] The present invention adopts the following technical solutions:

[0006] A sealing structure for a gas cylinder with a fully wrapped polymer liner fiber comprises a polymer liner, a metal valve seat, a gas cylinder fiber wrapped layer and a metal liner ring. The metal valve seat is installed at the bottle mouth of the polymer liner, and the gas cylinder fiber wrapped layer is coated on the bottom base of the polymer liner and the metal valve seat. An internal thread is provided in the metal valve seat, and an external thread is provided on the outside of the metal liner ring. The metal valve seat is threadedly connected to the external thread of the metal liner ring via the internal thread. After the metal liner ring is threadedly tightened, the bottom end face of the metal liner ring strongly squeezes the end face of the polymer liner bottle mouth to seal.

[0007] Preferably, an annular protrusion is provided in the center of the bottom end face of the metal liner ring, and an annular groove cooperating with the annular protrusion is provided correspondingly on the end face of the polymer material inner bottle mouth. The annular protrusion is forcefully squeezed into the annular groove to achieve sealing.

[0008] Preferably, an adhesion layer is provided at the bottom of the metal lining ring. After the bottom end face of the metal lining ring strongly presses the end face of the polymer material inner bottle mouth, the bottom of the metal lining ring and the end face of the polymer material inner bottle mouth are tightly connected and sealed through the adhesion layer.

[0009] Preferably, a half-circle saddle thread hole is provided at the external thread of the metal liner ring, and a corresponding half-circle saddle thread hole is provided at the internal thread of the metal valve seat. After the metal liner ring is threadedly tightened, the half-circle saddle thread hole of the metal liner ring and the half-circle saddle thread hole of the metal valve seat form a complete saddle thread hole, and the saddle thread hole is threadedly connected to the saddle screw.

[0010] Preferably, the cross-sectional shape of the annular groove on the end face of the polymer material liner bottle mouth is an arc shape, and the cross-sectional shape of the annular protrusion on the bottom end face of the metal liner ring is an arc shape.

[0011] Preferably, the adhesive layer is an ethyl adhesive layer.

[0012] Preferably, an internal thread is provided on the inner side of the metal liner ring, and the metal liner ring is connected to the external bottle mouth combination valve assembly via the internal thread.

[0013] The beneficial effects of the present invention are as follows: (1) the metal liner ring of the present invention is fastened to the polymer material inner shell by threads, and the sealing is achieved by the strong squeezing action of the end face annular protrusion and the annular groove. The sealing structure has a self-tightening sealing effect and is easy to install. At the same time, the metal liner ring can also be tightly connected to the polymer material inner shell through the dense adhesion layer formed by the ethyl adhesive. The sealing structure is simple and easy to install; (2) the metal liner ring and the metal valve seat are connected by a saddle screw to prevent the metal liner ring thread from loosening, thereby improving the reliability of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the present invention using an A-type metal liner ring seal;

[0015] Figure 2 This is a schematic diagram of the structure of the present invention using a B-type metal liner ring seal;

[0016] In the figure: 1. Type A polymer material liner, 11. Annular groove, 2. Metal valve seat, 21. Internal thread of metal valve seat, 22. Half circle saddle thread hole of metal valve seat, 3. Fiber winding layer of gas cylinder, 4. Type A metal liner ring, 41. Half circle saddle thread hole of Type A metal liner ring, 42. Internal thread of Type A metal liner ring, 43. External thread of Type A metal liner ring, 44. Annular protrusion, 5. Saddle screw, 6. Type B metal liner ring, 61. Half circle saddle thread hole of Type B metal liner ring, 62. Internal thread of Type B metal liner ring, 63. External thread of Type B metal liner ring, 7. Adhesion layer, 8. Type B polymer material liner. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0018] Example 1: Figure 1 As shown, a polymer material liner fiber fully wrapped gas cylinder sealing structure includes an A-type polymer material liner 1, a metal valve seat 2, a gas cylinder fiber winding layer 3, an A-type metal liner ring 4, and a saddle screw 5.

[0019] The A-type metal liner ring 4 is screwed into the metal valve seat 2 through the external thread 43 of the A-type metal liner ring and the internal thread 21 of the metal valve seat. During the screwing-in process, the annular protrusion 44 of the A-type metal liner ring is completely pressed into the annular groove 11 of the A-type polymer material liner 1; at this time, the A-type metal liner ring 4 is continued to be screwed in through the thread, and the annular protrusion 44 of the A-type metal liner ring strongly squeezes the annular groove 11 of the A-type polymer material liner and generates extremely high contact stress on the contact surface to achieve a sealing effect. When the gas cylinder is subjected to the internal pressure of the medium, the medium in the gas cylinder passes through the annular groove of the A-type metal liner ring. The arc surface on the inner side of the protrusion 44 transmits the internal pressure, so that the outer arc of the annular protrusion 44 squeezes the outer arc of the annular groove 11 of the A-type polymer material liner with greater pressure, generating higher contact stress, and ultimately achieving a better sealing effect, that is, this sealing structure has a self-tightening sealing effect; continue to screw in the A-type metal liner ring 4 until the half-circle saddle threaded hole 41 of the A-type metal liner ring and the half-circle saddle threaded hole 22 of the metal valve seat form a complete saddle threaded hole, and finally screw the saddle screw 5 into the saddle threaded hole to achieve the anti-loosening effect of the threaded connection between the A-type metal liner ring 4 and the metal valve seat 2.

[0020] The specific installation steps of the polymer material liner fiber fully wrapped gas cylinder sealing structure are as follows:

[0021] (1) If Figure 1As shown, the A-type metal liner ring 4 is screwed into the metal valve seat 2 through the external thread 43 of the A-type metal liner ring and the internal thread 21 of the metal valve seat. The first half of the thread tightening is relatively easy until the annular protrusion 44 of the A-type metal liner ring is completely pressed into the annular groove 11 of the A-type polymer material liner 1. At this time, the second half of the thread installation begins;

[0022] (2) After entering the second half of the thread installation, continue to screw the A-type metal liner ring 4 into the metal valve seat 2 using a torque wrench until the minimum torque value set by the torque wrench is reached, where the minimum torque value set by the torque wrench is calculated based on the properties of the polymer liner material;

[0023] (3) After the minimum set torque value of the torque wrench is reached, continue to screw the A-type metal liner ring 4 into the metal valve seat 2 until the half-circle saddle thread hole 41 of the A-type metal liner ring and the half-circle saddle thread hole 22 of the metal valve seat form a completed saddle thread hole, and screw the saddle screw 5 into the saddle thread hole to complete the installation.

[0024] Example 2: Figure 2 As shown, a polymer material liner fiber fully wrapped gas cylinder sealing structure includes a metal valve seat 2, a cylinder fiber winding layer 3, a saddle screw 5, a B-type metal liner ring 6, an adhesive layer 7, and a B-type polymer material liner 8.

[0025] The end face of the B-type metal liner ring 6 and the bottle mouth end face of the B-type polymer material liner 8 are evenly coated with an adhesion layer adhesive 7 respectively, and the B-type metal liner ring 6 is screwed into the metal valve seat 2 through the external thread 63 of the B-type metal liner ring and the internal thread 21 of the metal valve seat until the end face of the B-type metal liner ring 6 and the bottle mouth end face of the B-type polymer material liner 8 are lightly contacted, so that the adhesion layer adhesive coated on the two end faces is fully fused and solidified into a dense adhesion layer 7, while ensuring that the half-circle saddle threaded hole 61 of the B-type metal liner ring and the half-circle saddle threaded hole 22 of the metal valve seat form a complete saddle threaded hole, and finally the saddle screw 5 is screwed into the saddle threaded hole to achieve the anti-loosening effect of the threaded connection between the B-type metal liner ring 6 and the metal valve seat 2.

[0026] The specific installation steps of the polymer material liner fiber fully wrapped gas cylinder sealing structure are as follows:

[0027] (1) Clean the end face of the B-type metal liner ring 6 and the end face of the bottle mouth of the B-type polymer material liner 8, so that both end faces are clean and tidy without oil stains, large dust particles, etc.;

[0028] (2) Uniformly coating the adhesive of the adhesive layer 7 on the end surface of the B-type metal liner ring 6 and the end surface of the B-type polymer material liner 8;

[0029] (3) Screw the B-type metal liner ring 6 into the metal valve seat 2 through the external thread 63 and the internal thread 21 to the predetermined position. The predetermined position is described here as the end face of the B-type metal liner ring 6 slightly contacting the end face of the B-type polymer material inner liner 8, and the half-circle saddle thread hole 61 of the B-type metal liner ring and the half-circle saddle thread hole 22 of the metal valve seat form a complete saddle thread hole. Finally, screw the saddle screw 5 into the saddle thread hole to complete the installation.

[0030] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solution described in the claims.

Claims

1. A gas cylinder sealing structure with a polymer liner and fully wrapped fibers, comprising a polymer liner, a metal valve seat, a cylinder fiber wrapping layer, and a metal liner ring, characterized in that: The metal valve seat is installed at the bottle mouth of the polymer material liner, the fiber winding layer of the gas cylinder is coated on the bottom base of the polymer material liner and the metal valve seat, an internal thread is provided in the metal valve seat, and an external thread is provided on the outside of the metal liner ring. The metal valve seat is threadedly connected to the external thread of the metal liner ring through the internal thread. After the metal liner ring is threadedly tightened, the bottom end face of the metal liner ring strongly presses the end face of the bottle mouth of the polymer material liner to seal; The inner side of the metal lining ring is provided with an internal thread, and the metal lining ring is connected to the external bottle mouth combination valve assembly through the internal thread; The bottom end face of the metal liner ring is provided with an annular protrusion in the center, and the end face of the polymer material inner bottle mouth is provided with an annular groove that matches the annular protrusion. The annular protrusion is strongly squeezed into the annular groove to achieve sealing; Or an adhesive layer is provided at the bottom of the metal lining ring. After the end face of the bottom of the metal lining ring strongly presses the end face of the polymer material liner bottle mouth, the bottom of the metal lining ring and the end face of the polymer material liner bottle mouth are tightly connected and sealed through the adhesive layer.

2. The polymer material liner fiber fully wrapped gas cylinder sealing structure according to claim 1 is characterized in that: A half-circle saddle threaded hole is provided at the external thread of the metal liner ring, and a half-circle saddle threaded hole is correspondingly provided at the internal thread of the metal valve seat. After the metal liner ring is threadedly tightened, the half-circle saddle threaded hole of the metal liner ring and the half-circle saddle threaded hole of the metal valve seat form a complete saddle threaded hole, and the saddle threaded hole is threadedly connected to the saddle screw.

3. The polymer material liner fiber fully wrapped gas cylinder sealing structure according to claim 1 is characterized in that: The cross-sectional shape of the annular groove on the end face of the polymer material inner liner bottle mouth is an arc shape, and the cross-sectional shape of the annular protrusion on the bottom end face of the metal liner ring is an arc shape.

4. The polymer material liner fiber fully wrapped gas cylinder sealing structure according to claim 1 is characterized in that: The adhesive layer is an ethyl adhesive layer.

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