A plastic liner composite gas cylinder joint

Abstract

The present invention provides a joint for a composite gas cylinder with a plastic liner, which relates to the technical field of pressure vessel manufacturing, and comprises a joint body and a sealing ring. The joint body is cylindrical and provided with a through hole for gas to pass through, and one end of the joint body is provided with an annular mounting groove, which is arranged between the inner and outer side walls of the joint body, and the mounting groove is used to accommodate the bottle mouth of the gas cylinder liner and is in sealing contact with and fixedly connected to the inner and outer side walls of the bottle mouth of the gas cylinder liner, and the sealing ring is sleeved on the inner wall of the joint body, and the sealing ring can be used for sealing contact with the docking component. The joint for a composite gas cylinder with a plastic liner provided by the present invention enhances the installation strength and installation stability with the composite gas cylinder liner, reduces the deformation of the bottle mouth of the composite gas cylinder, and has good sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel manufacturing, in particular to a plastic liner composite gas cylinder joint. Background Art

[0002] With the rapid development of my country's economy, especially the rapid increase in the production and ownership of fuel vehicles in my country, the energy and environmental crises are becoming increasingly obvious. The use of abundant, clean and pollution-free natural gas resources is of great practical significance to the development of my country's automobile industry and the entire industry. At present, in natural gas vehicles and fuel cell vehicles, fuel is mostly stored in gas cylinders in the form of compressed gas. In my country, the widely used gas cylinders at this stage are mainly alloy liner gas cylinders, while internationally, plastic liner fiber fully wrapped composite gas cylinders have developed rapidly due to their advantages such as light weight, low manufacturing cost, superior impact resistance and good fatigue resistance, and have become the mainstream. The plastic liner fiber fully wrapped composite gas cylinder has a double-layer structure, the outer layer is a fiber layer (composite material winding layer), and the inner layer is a plastic liner.

[0003] The strength and rigidity of the plastic liner are relatively low, so the fully wrapped composite gas cylinder with a plastic liner generally uses a metal joint. After long-term use, the metal joint and the fully wrapped composite gas cylinder with a plastic liner are prone to stratification and leakage due to the different materials of the plastic liner and the metal joint; the traditional joint of the composite gas cylinder with a plastic liner has no double-layer support structure at the bottle mouth, and the connection strength is low. When the composite gas cylinder is filled and deflated, it directly impacts the bottle mouth of the liner, and the bottle mouth of the composite gas cylinder is prone to deformation, poor air tightness, and easy to cause gas leakage; the joint of the composite gas cylinder with a plastic liner is directly connected to the docking component by means of threads, etc., and there is no sealing structure, so the sealing performance is difficult to guarantee. Summary of the invention

[0004] The purpose of the present invention is to provide a plastic liner composite gas cylinder joint to solve the problems existing in the above-mentioned prior art, enhance the installation strength and installation stability, reduce the deformation at the bottle mouth of the composite gas cylinder, and have good sealing performance.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a plastic liner composite gas cylinder joint, comprising a joint body and a sealing ring, wherein the joint body is cylindrical and provided with a through hole for gas to pass through, one end of the joint body is provided with an annular mounting groove, the mounting groove is arranged between the inner side wall and the outer side wall of the joint body, the mounting groove is used to accommodate the bottle mouth of the gas cylinder liner and is in sealing contact with and fixedly connected to the inner and outer side walls of the bottle mouth of the gas cylinder liner, the sealing ring is sleeved on the inner wall of the joint body, and the sealing ring can be used to be in sealing contact with the docking component of the plastic liner composite gas cylinder joint.

[0007] Preferably, the joint body includes a mounting seat and a connecting head, the mounting seat and the connecting head are both cylindrical, one end of the mounting seat is used to communicate with and fixedly connect with one end of the connecting head, and the other end of the mounting seat is provided with the mounting groove.

[0008] Preferably, a mounting ring is provided on the outer wall of the mounting seat near one end of the mounting groove, and the mounting ring extends toward the outside of the mounting seat along the radial direction of the mounting seat. The mounting ring is used to seal and fix the inner liner of the gas cylinder, and an annular protrusion is provided on the end surface of the mounting ring away from the connecting head.

[0009] Preferably, the mounting ring has a first mounting surface and a second mounting surface, one end of the first mounting surface is connected to the outer wall of the mounting seat, the other end of the first mounting surface is connected to the second mounting surface, the second mounting surface is used to seal and fix the inner liner of the gas cylinder, and the first mounting surface is used to wrap the fiber layer.

[0010] Preferably, the connector has a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are both annular and have the same inner diameter, the outer diameter of the first connecting portion is larger than the outer diameter of the second connecting portion, the second connecting portion is used to be sleeved in the mounting seat and sealedly connected to the inner side wall of the mounting seat, and the outer diameter of the first connecting portion is the same as the outer diameter of the mounting seat.

[0011] Preferably, the mounting seat includes an internal mounting cylinder, an intermediate mounting cylinder and an external mounting cylinder, the internal mounting cylinder is used to be sleeved in the intermediate mounting cylinder and sealedly connected to the inner side wall of the intermediate mounting cylinder, the intermediate mounting cylinder is used to be sleeved in the outer mounting cylinder and sealedly connected to the inner side wall of the outer mounting cylinder, the internal mounting cylinder is used to communicate with the connecting head, and the end faces of the intermediate mounting cylinder and the internal mounting cylinder away from the mounting groove are used to be sealedly connected to the end face of the second connecting part.

[0012] Preferably, the sealing ring is used to be sleeved inside the second connecting part and to be in sealing contact with and fixedly connected to the inner wall of the second connecting part, the inner diameter of the internal mounting tube is smaller than the inner diameter of the second connecting part, and the end face of the sealing ring away from the connecting head is used to be in sealing contact with and fixedly connected to the end face of the internal mounting tube.

[0013] Preferably, the mounting seat is provided with a first mounting hole, and the connecting head is provided with a second mounting hole, there are multiple first mounting holes, the number of the first mounting holes and the number of the second mounting holes are the same, the axes of the first mounting holes and the second mounting holes are colinear, the mounting seat and the connecting head are connected by fasteners passing through the first mounting holes and the second mounting holes, and the inner side wall of the connecting head is provided with threads.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The plastic liner composite gas cylinder joint provided by the present invention is provided with an installation groove on the joint body, and the shape of the installation groove matches the bottle mouth of the gas cylinder liner. When installing, the bottle mouth of the gas cylinder liner is embedded in the installation groove, and the inner and outer side walls of the installation groove are respectively in sealing contact with the inner and outer side walls of the bottle mouth of the gas cylinder liner and fixedly connected, that is, the inner and outer side walls of the bottle mouth of the gas cylinder liner are both sealed. This double-layer sealing structure increases the sealing area and has a supporting effect on both the inner and outer sides of the bottle mouth of the gas cylinder liner, thereby enhancing the installation strength and the stability of the installation, which is beneficial to reducing the filling and discharging of gas. The impact of the airflow on the mouth of the composite gas cylinder is reduced, thereby slowing down the deformation of the mouth of the composite gas cylinder, which is beneficial to reducing the occurrence of gas leakage, and the structure and processing technology are simple; the sealing ring is sleeved on the inner wall of the joint body, and the sealing ring can be used to seal and contact with the docking component of the plastic liner composite gas cylinder joint. When the plastic liner composite gas cylinder joint is connected to external docking components such as valves or air pipes, the docking component can press the sealing ring to achieve a sealing effect, thereby improving the airtightness of the plastic liner composite gas cylinder joint and the external docking component, and effectively reducing the occurrence of gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a plastic liner composite gas cylinder joint provided by the present invention;

[0018] In the figure: 100-plastic liner composite gas cylinder joint, 1-joint body, 101-through hole, 102-mounting groove, 2-gas cylinder liner, 3-mounting seat, 301-mounting ring, 302-first mounting surface, 303-second mounting surface, 304-first mounting hole, 305-inner mounting cylinder, 306-middle mounting cylinder, 307-outer mounting cylinder, 4-connector, 401-first connecting part, 402-second connecting part, 403-second mounting hole, 5-sealing ring, 6-fiber layer. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The purpose of the present invention is to provide a plastic liner composite gas cylinder joint to solve the problems existing in the prior art, enhance the installation strength and installation stability, reduce the deformation at the bottle mouth of the composite gas cylinder, and have good sealing performance.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, the present invention provides a plastic liner composite gas cylinder joint 100, including a joint body 1 and a sealing ring 5, the joint body 1 is cylindrical and is provided with a through hole 101 for gas to pass through, one end of the joint body 1 is provided with an annular mounting groove 102, the mounting groove 102 is arranged between the inner wall and the outer wall of the joint body 1, the mounting groove 102 is used to accommodate the bottle mouth of the gas cylinder liner 2 and is in sealing contact with the inner and outer walls of the bottle mouth of the gas cylinder liner 2 and is fixedly connected. During installation, the mouth of the gas cylinder liner 2 is embedded in the installation groove 102, and the inner and outer side walls of the installation groove 102 are respectively sealed and contacted with the inner and outer side walls of the mouth of the gas cylinder liner 2 and fixedly connected, that is, the inner and outer side walls of the mouth of the gas cylinder liner 2 are sealed. This double-layer sealing structure increases the sealing area and has a supporting effect on both the inner and outer sides of the mouth of the gas cylinder liner 2, thereby enhancing the installation strength and stability, which is beneficial to reducing the impact of the airflow on the mouth of the gas cylinder liner 2 during charging and discharging, thereby slowing down the deformation of the mouth of the gas cylinder liner 2, which is beneficial to reducing the occurrence of gas leakage, and has a simple structure and simple processing technology. The sealing ring 5 is sleeved on the inner wall of the joint body 1, and the sealing ring 5 can be used to seal and contact with the docking component of the plastic liner composite gas cylinder joint 100. When the plastic liner composite gas cylinder joint 100 is connected to an external docking component such as a valve or a trachea, the docking component can press the sealing ring 5 to achieve a sealing effect, thereby improving the airtightness of the plastic liner composite gas cylinder joint 100 and the external docking component, and effectively reducing the occurrence of gas leakage.

[0023] The connector body 1 includes a mounting seat 3 and a connecting head 4. The connecting head 4 is made of metal, preferably an iron alloy or a copper alloy. The mounting seat 3 and the connecting head 4 are both cylindrical. One end of the mounting seat 3 is used to communicate with one end of the connecting head 4 and is in sealing contact and fixed connection. The other end of the mounting seat 3 is provided with a mounting groove 102. Preferably, the depth direction of the mounting groove 102 is parallel to the axis of the mounting seat 3. The depth of the mounting groove 102 is greater than the length of the bottle mouth of the gas cylinder liner 2. The bottle mouth of the gas cylinder liner 2 can be completely embedded in the mounting groove 102, which can effectively prevent the bottle mouth of the gas cylinder liner 2 from deforming, and further avoid the occurrence of blockage of the through hole 101 of the connector body 1 due to deformation of the bottle mouth of the gas cylinder liner 2.

[0024] A mounting ring 301 is provided on the outer wall of the mounting seat 3 near the mounting groove 102. The mounting ring 301 extends toward the outside of the mounting seat 3 along the radial direction of the mounting seat 3, thereby increasing the sealing area between the mounting seat 3 and the gas cylinder liner 2 and improving the mounting strength and sealing performance. The mounting ring 301 is used for sealing contact with and fixedly connected to the gas cylinder liner 2. An annular protrusion is provided on the end face of the mounting ring 301 away from the connecting head 4. The structure is simple, and no complicated modifications to the gas cylinder liner 2 are required. The sealing area between the mounting seat 3 and the gas cylinder liner 2 is further increased, and the sealing performance is good.

[0025] The mounting ring 301 includes a first mounting surface 302 and a second mounting surface 303, one end of the first mounting surface 302 is connected to the outer side wall of the mounting seat 3, and the other end of the first mounting surface 302 is connected to the second mounting surface 303, the second mounting surface 303 is used to be in sealing contact with and fixedly connected to the gas cylinder liner 2, and the first mounting surface 302 is used to wrap the fiber layer 6, and the fiber layer 6 is wrapped from the gas cylinder body to the first mounting surface 302, which is beneficial to strengthen the installation strength of the plastic liner composite gas cylinder connector 100 and the gas cylinder liner 2; preferably, the first mounting surface 302 and the gas cylinder liner 2 have a smooth transition at the junction, so that the wrapped fiber layer 6 is smoother.

[0026] The connector 4 has a first connector part 401 and a second connector part 402. The first connector part 401 and the second connector part 402 are both annular and have the same inner diameter. The outer diameter of the first connector part 401 is greater than the outer diameter of the second connector part 402. The second connector part 402 is used to be sleeved in the mounting seat 3 and sealed with the inner wall of the mounting seat 3, which effectively increases the sealing area between the connector 4 and the mounting seat 3, which is beneficial to enhance the installation strength and sealing performance of the plastic liner composite gas cylinder connector 100 and the gas cylinder liner 2; the outer diameter of the first connector part 401 is the same as the outer diameter of the mounting seat 3, which is beneficial to avoid wear or collision of the mounting seat 3, thereby extending the service life of the plastic liner composite gas cylinder connector 100.

[0027] The mounting seat 3 includes an internal mounting tube 305, an intermediate mounting tube 306 and an external mounting tube 307. The internal mounting tube 305 and the external mounting tube 307 are made of plastic, which is the same material as the gas cylinder liner 2. The intermediate mounting tube 306 is made of metal, and the intermediate mounting tube 306 is made of the same material as the connector 4. Compared with the metal connector directly connected to the gas cylinder liner 2, the connection between the mounting tube 305 and the external mounting tube 307 and the gas cylinder liner 2 and the connection between the intermediate mounting tube 306 and the connector 4 has high connection strength, no delamination, better sealing performance, and thus improves the plastic liner composite gas cylinder joint 10. 0 has a good sealing effect. At the same time, the material of the middle mounting cylinder 306 is metal, which is beneficial to increase the strength of the mounting seat 3. The middle mounting cylinder 306 is preferably a retaining ring. The internal mounting cylinder 305 is used to be sleeved in the middle mounting cylinder 306 and is sealed and fixed to the inner wall of the middle mounting cylinder 306. The middle mounting cylinder 306 is used to be sleeved in the outer mounting cylinder 307 and is sealed and connected to the inner wall of the outer mounting cylinder 307. The internal mounting cylinder 305 is used to communicate with the connector 4. The end faces of the middle mounting cylinder 306 and the inner mounting cylinder 305 away from the mounting groove 102 are used to be sealed and connected to the end face of the second connecting part 402.

[0028] The sealing ring 5 is used to be sleeved in the second connection part 402 and to be in sealing contact with the inner wall of the second connection part 402 and to be fixedly connected. The inner diameter of the internal installation tube 305 is smaller than the inner diameter of the second connection part 402. The end surface of the sealing ring 5 away from the connector 4 is used to be in sealing contact with the end surface of the internal installation tube 305 and to be fixedly connected. The sealing ring 5 can further improve the air tightness of the plastic liner composite gas cylinder joint 100 itself; when the plastic liner composite gas cylinder joint 100 is connected to an external docking component such as a valve or a trachea, the docking component can press the sealing ring 5 to achieve a sealing effect, thereby improving the air tightness of the plastic liner composite gas cylinder joint 100 and the external docking component, and effectively reducing the occurrence of gas leakage.

[0029] A first mounting hole 304 is provided on the mounting base 3, and a second mounting hole 403 is provided on the connecting head 4. There are multiple first mounting holes 304, and the number of the first mounting holes 304 and the second mounting holes 403 is the same. The axes of the first mounting holes 304 and the second mounting holes 403 are colinear. The mounting base 3 and the connecting head 4 are connected by fasteners passing through the first mounting holes 304 and the second mounting holes 403, so that the connection between the mounting base 3 and the connecting head 4 is more firmly established. The inner side wall of the connecting head 4 is provided with threads. External docking components such as valves or air pipes are generally made of metal. The connecting head 4 is made of metal and is fixed to the external docking components by threaded connection, which can make the connection more stable and firm, ensure that the external docking components are not easy to fall off, and avoid gas leakage.

[0030] The preferred fixed connection method between the connector 4 and the middle mounting tube 306 in the plastic liner composite gas cylinder joint 100 provided by the present invention is welding, and the preferred fixed connection method between the other components is fusion or adhesive bonding.

[0031] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A plastic liner composite gas cylinder joint, characterized in that: It comprises a joint body and a sealing ring, wherein the joint body is cylindrical and provided with a through hole for gas to pass through, one end of the joint body is provided with an annular mounting groove, the mounting groove is provided between the inner side wall and the outer side wall of the joint body, the mounting groove is used to accommodate the bottle mouth of the gas cylinder liner and is in sealing contact with and fixedly connected to the inner and outer side walls of the bottle mouth of the gas cylinder liner, the sealing ring is sleeved on the inner wall of the joint body, and the sealing ring can be used to be in sealing contact with the docking component of the plastic liner composite gas cylinder joint; The joint body comprises a mounting seat and a connector, both the mounting seat and the connector are cylindrical, one end of the mounting seat is used to communicate with and be fixedly connected to one end of the connector, and the other end of the mounting seat is provided with the mounting groove; The connector comprises a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are both annular and have the same inner diameter, the outer diameter of the first connecting portion is larger than the outer diameter of the second connecting portion, the second connecting portion is used to be sleeved in the mounting seat and sealedly connected to the inner side wall of the mounting seat, and the outer diameter of the first connecting portion is the same as the outer diameter of the mounting seat; The mounting seat comprises an inner mounting tube, an intermediate mounting tube and an outer mounting tube, the inner mounting tube is used to be sleeved in the intermediate mounting tube and sealedly connected to the inner side wall of the intermediate mounting tube, the intermediate mounting tube is used to be sleeved in the outer mounting tube and sealedly connected to the inner side wall of the outer mounting tube, the inner mounting tube is used to communicate with the connecting head, and the end faces of the intermediate mounting tube and the inner mounting tube away from the mounting groove are used to be sealedly connected to the end face of the second connecting part; the sealing ring is used to be sleeved in the second connecting part and to be in sealing contact with the inner side wall of the second connecting part and to be fixedly connected, the inner diameter of the inner mounting tube is smaller than the inner diameter of the second connecting part, and the end face of the sealing ring away from the connecting head is used to be in sealing contact with the end face of the inner mounting tube and to be fixedly connected; the material of the inner mounting tube and the outer mounting tube is plastic, and the material of the intermediate mounting tube and the connecting head is metal; The mounting seat is provided with a first mounting hole, the connecting head is provided with a second mounting hole, and the mounting seat and the connecting head are connected by fasteners passing through the first mounting hole and the second mounting hole.

2. The plastic liner composite gas cylinder joint according to claim 1, characterized in that: A mounting ring is provided on the outer wall of the mounting seat near one end of the mounting groove, and the mounting ring extends toward the outside of the mounting seat along the radial direction of the mounting seat. The mounting ring is used to seal and fix with the gas cylinder liner, and an annular protrusion is provided on the end surface of the mounting ring away from the connector.

3. The plastic liner composite gas cylinder joint according to claim 2, characterized in that: The mounting ring has a first mounting surface and a second mounting surface, one end of the first mounting surface is connected to the outer side wall of the mounting seat, the other end of the first mounting surface is connected to the second mounting surface, the second mounting surface is used to seal and fix the inner liner of the gas cylinder, and the first mounting surface is used to wrap the fiber layer.

4. The plastic liner composite gas cylinder joint according to claim 1, characterized in that: There are multiple first mounting holes, the number of the first mounting holes and the number of the second mounting holes are the same, the axes of the first mounting holes and the second mounting holes are collinear, and the inner side wall of the connector is provided with threads.

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