Connecting structure of gas pipeline

Abstract

The utility model discloses a connecting structure of a gas pipeline, and belongs to the field of pipe fitting connection. The connecting structure of the gas pipeline comprises a gas path connector and a gas inlet straight pipe. The gas circuit connector comprises a connector body, a cylindrical groove is formed in the gas inlet end, a first annular groove and a second annular groove are formed in the inner side of the cylindrical groove in the circumferential direction, and sealing washers are arranged in the annular grooves respectively. A limiting cylinder is arranged in the cylindrical groove; a third annular groove is formed in an inner cavity of the limiting cylinder, a third sealing gasket is arranged in the third annular groove, a movable column is arranged in the third sealing gasket in a sleeving mode, and the movable column slides in the third sealing gasket; a spring is arranged in an inner cavity of the limiting cylinder, the top end of the movable column is connected with a circular truncated cone base, and a bottom port of the air inlet straight pipe is movably connected with the upper bottom face of the circular truncated cone base. Positioning supporting pieces are fixedly arranged on the lower end faces of the limiting cylinders. According to the connecting structure of the gas pipeline, the connecting mode is simplified, and the sealing performance of the connecting structure of the gas pipeline can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of pipe fitting connection, in particular to a connection structure for a gas pipeline. Background Art

[0002] The connection structure of a gas pipeline is a component that can interconnect, switch on and off, and transmit pressure between different gases or different devices. Most of the existing connection structures of gas pipelines connect hoses through tools such as flanges and hoop clamps. Frequent disassembly and assembly affect the sealing effect of the connection structure, and tools are required to assist in the process, which cannot achieve quick disassembly and assembly, and the use process is relatively troublesome. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a connection structure for a gas pipeline, which ensures gas tightness, has a simple structure, and is convenient for disassembly and assembly at the same time.

[0004] The technical solution provided by the utility model is as follows:

[0005] A connection structure for a gas pipeline includes a gas path connector and an intake straight pipe movably connected to the gas path connector;

[0006] The interior of the intake straight pipe is an intake passage, and at least one air hole is opened along the circumference at the bottom end of the intake straight pipe;

[0007] The gas path connector includes a cylindrical connector body. The upper end of the connector body is an intake end, and the intake end faces the intake straight pipe; the lower end of the connector body is an outlet end, and an outlet passage is axially arranged at the outlet end;

[0008] A cylindrical groove is opened inside the intake end. A first annular groove and a second annular groove are axially spaced along the circumferential direction on the inner side of the cylindrical groove. A first sealing gasket and a second sealing gasket are respectively arranged in the first annular groove and the second annular groove. The cylindrical groove space between the first sealing gasket and the second sealing gasket forms a buffer zone, and the intake straight pipe is movably sleeved in the first sealing gasket and the second sealing gasket;

[0009] A limiting cylinder coaxial with the central axis of the cylindrical groove is arranged in the cylindrical groove. The limiting cylinder is a cylindrical structure with an open upper end and a closed lower end; the outer diameter of the limiting cylinder is smaller than the diameter of the cylindrical groove, and an internal air flow passage communicating with the outlet passage is formed between the limiting cylinder and the inner wall of the connector body;

[0010] An activity column is arranged in the inner cavity of the limiting cylinder, and the central axis of the activity column coincides with the central axis of the limiting cylinder;

[0011] The top end of the movable column is fixedly connected with a frustum base, and the central axes of the frustum base and the movable column coincide; the diameter of the upper bottom surface of the frustum base is smaller than that of the lower bottom surface, and the lower bottom surface of the frustum base is fixedly or detachably connected with the movable column; the diameter of the lower bottom surface of the frustum base is larger than the inner diameter of the limiting cylinder, and the frustum base moves between the limiting cylinder and the second sealing washer; the bottom port of the intake straight pipe is movably connected with the upper bottom surface of the frustum base;

[0012] A spring is arranged in the inner cavity of the limiting cylinder. One end of the spring is fixed at the middle position of the bottom surface of the inner cavity of the limiting cylinder, and the other end of the spring abuts against the bottom surface of the movable column;

[0013] The lower end surface of the limiting cylinder is fixedly provided with a positioning support member, so that the central axis of the limiting cylinder coincides with the central axis of the cylindrical groove, and at the same time, the internal air flow channel communicates with the air outlet channel.

[0014] Further, a third annular groove is formed in the inner cavity of the limiting cylinder near the opening along the circumferential direction. A third sealing washer is arranged in the third annular groove, and the movable column is sleeved in the third sealing washer and slides in the third sealing washer.

[0015] Further, the positioning support member includes a positioning rod and at least one support arm located on the top surface of the positioning rod. The upper end surface of the support arm contacts the lower end surface of the limiting cylinder, the lower end surface of the support arm contacts the bottom end surface of the cylindrical groove, and the positioning rod does not completely contact the side wall of the air outlet channel.

[0016] Further, the positioning support member is of a shell structure, and a positioning support member cavity is formed inside the positioning support member.

[0017] The utility model has the following beneficial effects:

[0018] (1). The combined structure of the first annular groove, the second annular groove and the corresponding first sealing washer and second sealing washer ensures the sealing effect of the internal space during the connection process, ventilation process and separation process of the intake straight pipe and the gas path joint, and avoids external gas from entering the internal space and affecting the purity of the internal flowing gas;

[0019] (2). The arrangement of the spring in the limiting cylinder can realize the automatic reset of the frustum base, making it more convenient to use; at the same time, it avoids external gas from entering the internal space of the gas path joint during the removal process of the intake straight pipe and affecting the purity of the next incoming gas;

[0020] (3). The connection structure of the gas pipeline of the utility model has the characteristics of simple structure, convenient disassembly and assembly, and reasonable design, and can reduce the connection time and labor cost. Description of the Drawings

[0021] Figure 1 It is a three-dimensional view of the connection state of the connection structure of the gas pipeline;

[0022] Figure 2 Explosion diagram of the connection structure of the gas pipeline;

[0023] Figure 3 Front view of the connection structure of the gas pipeline;

[0024] Figure 4 For Figure 3 Section view taken along the A-A direction in

[0025] Figure 5 Stereogram of the intake straight pipe;

[0026] Figure 6 For Figure 5 Partial enlarged view at position C in

[0027] Figure 7 Stereogram of the gas path joint;

[0028] Figure 8 Front view of the intake joint;

[0029] Figure 9 For Figure 8 Section view taken along the B-B direction in

[0030] Figure 10 Front view of the joint body;

[0031] Figure 11 For Figure 10 Section view taken along the E-E direction in

[0032] Figure 12 Stereogram of the connected state of the frustum base and the movable column;

[0033] Figure 13 Stereogram of the limiting cylinder;

[0034] Figure 14 Front view of the limiting cylinder;

[0035] Figure 15 For Figure 14 Section view taken along the D-D direction in

[0036] Figure 16 Stereogram of the positioning support;

[0037] Figure 17 Front view of the positioning support;

[0038] Figure 18 Stereogram of the positioning support with a cavity for the positioning support.

[0039] Among them,

[0040] 100, Gas pipeline joint; 101, Joint body; 102, Inlet end; 103, Outlet end; 104, Outlet channel; 105, Cylindrical groove; 106, First annular groove; 107, Second annular groove; 108, First sealing washer; 109, Second sealing washer; 110, Buffer zone; 111, Limiting cylinder; 112, Internal air flow channel; 113, Third annular groove; 114, Third sealing washer; 115, Movable column; 116, Spring; 117, Frustum seat; 118, Positioning support; 1181, Positioning rod; 1182, Support arm; 1183, Positioning support cavity

[0041] 200, Inlet straight pipe; 201, Inlet channel; 202, Air hole Detailed implementation mode

[0042] To make the technical problems, technical solutions and advantages to be solved by the present utility model clearer, the following will combine the drawings Figures 1 to 18 and specific embodiments to clearly and completely describe the technical solutions of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present utility model

[0043] The embodiment of the present utility model provides a connection structure for a gas pipeline, as Figures 1 to 4 shown, including a gas pipeline joint 100 and an inlet straight pipe 200 movably connected to the gas pipeline joint 100. The inside of the inlet straight pipe 200 is an inlet channel 201. The upper end of the inlet straight pipe 200 is for connecting the front pipeline, and at least one air hole 202 is provided along the circumference at the bottom end of the inlet straight pipe 200, as Figure 5 and Figure 6 shown

[0044] As Figures 7 to 11 shown, the gas pipeline joint 100 includes a cylindrical joint body 101. The upper end of the joint body 101 is an inlet end 102, and the inlet end 102 faces the inlet straight pipe 200; the lower end of the joint body 101 is an outlet end 103, and an outlet channel 104 is axially provided at the outlet end 103, and the end of the outlet end 103 is connected to the rear pipeline

[0045] The intake end 102 is internally provided with a cylindrical groove 105. Along the circumferential direction inside the cylindrical groove 105, a first annular groove 106 and a second annular groove 107 are axially spaced. A first sealing washer 108 and a second sealing washer 109 are respectively arranged in the first annular groove 106 and the second annular groove 107. Since the first sealing washer 108 and the second sealing washer 109 are respectively sleeved on the first annular groove 106 and the second annular groove 107, the shedding of the first sealing washer 108 and the second sealing washer 109 is avoided, and finally the sealing effect is better. The space of the cylindrical groove 105 between the first sealing washer 108 and the second sealing washer 109 forms a buffer zone 110; when the intake straight pipe 200 is connected to the gas path joint 100, the intake straight pipe 200 is movably sleeved in the first sealing washer 108 and the second sealing washer 109, avoiding the entry of external gas into the internal space during the connection process and causing gas pollution.

[0046] A limiting cylinder 111 that coincides with the central axis of the cylindrical groove 105 is arranged in the cylindrical groove 105. The structure of the limiting cylinder 111 is as Figures 13 to 15 shown. The limiting cylinder 111 is a cylindrical structure with an open upper end and a closed lower end; the outer diameter of the limiting cylinder 111 is smaller than the diameter of the cylindrical groove 105, and an internal air flow channel 112 that communicates with the air outlet channel 104 is formed between the limiting cylinder 111 and the inner wall of the joint body 101. An active column 115 is arranged in the inner cavity of the limiting cylinder 111. The central axis of the active column 115 coincides with the central axis of the limiting cylinder 111, and the active column 115 can move up and down along the central axis direction in the inner cavity of the limiting cylinder 111.

[0047] The top end of the active column 115 is connected with a frustum seat 117, and the central axes of the frustum seat 117 and the active column 115 coincide. The connection mode between the frustum seat 117 and the active column 115 is slot clamping or screw connection or bonding or integral molding. The diameter of the upper bottom surface of the frustum seat 117 is smaller than the diameter of the lower bottom surface. The diameter of the lower bottom surface of the frustum seat 117 is larger than the diameter of the active column 115, and the lower bottom surface of the frustum seat 117 is connected to the active column 115. The diameter of the lower bottom surface of the frustum seat 117 is larger than the inner diameter of the limiting cylinder. The frustum seat 117 moves between the limiting cylinder 111 and the second sealing washer 109. The diameter of the upper bottom surface of the frustum seat 117 is larger than the inner diameter of the intake straight pipe 200, and the bottom port of the intake straight pipe 200 is movably connected to the upper bottom surface of the frustum seat 117. When the bottom port of the intake straight pipe 200 contacts the upper bottom surface of the frustum seat 117, the gas in the intake channel 201 can flow out from the air holes 202 of the intake straight pipe 200 to the internal air flow channel 112.

[0048] A spring 116 is arranged in the inner cavity of the limiting cylinder 111. One end of the spring 116 is fixed at the middle position of the bottom surface of the inner cavity of the limiting cylinder 111, and the fixing method can be adhesive bonding or clamping. The other end of the spring 116 abuts against the bottom surface of the movable column 115.

[0049] While playing a sealing role, the second sealing washer 109 and the limiting cylinder 111 play a role in limiting the moving positions at both ends of the movement of the frustum base 117.

[0050] A positioning support member 118 is fixedly arranged on the lower end surface of the limiting cylinder 111, so that the central axis of the limiting cylinder 111 coincides with the central axis of the cylindrical groove 105, and at the same time, it is ensured that the internal air flow channel 112 communicates with the air outlet channel 104. The fixing method is adhesive bonding, clamping or screw connection.

[0051] The combined structure of the first annular groove 106, the second annular groove 107 and the corresponding first sealing washer 108 and second sealing washer 109 ensures the sealing effect of the internal space during the connection process, ventilation process and separation process of the intake straight pipe 200 and the air path joint 100, and avoids the entry of external gas into the internal space and affecting the purity of the internal flowing gas.

[0052] The setting of the spring 116 in the limiting cylinder 111 can realize the automatic reset of the frustum base 117, making it more convenient to use; at the same time, it avoids the entry of external gas into the internal space of the air path joint 100 during the process of the intake straight pipe 200 being removed from the air path joint 100 and affecting the purity of the gas introduced next time.

[0053] A preferred embodiment of the present invention: A third annular groove 113 is opened along the circumferential direction near the opening position of the inner cavity of the limiting cylinder 111. A third sealing washer 114 is arranged in the third annular groove 113. A movable column 115 is sleeved inside the third sealing washer 114, and the movable column 115 can slide inside the third sealing washer 114.

[0054] By arranging the third sealing washer 114 at the opening position of the limiting cylinder 111, it avoids the closed space that is prone to storing gas formed inside the limiting cylinder 111 due to the up and down movement of the movable column 115 inside the limiting cylinder 111, and thus avoids gas pollution.

[0055] Another preferred embodiment of the present invention: The structure of the positioning support member 118 is as Figure 16 and Figure 17As shown, the positioning support 118 includes a positioning rod 1181 and at least one support arm 1182 located on the top surface of the positioning rod 1181. In this embodiment, two symmetric support arms 1182 are provided. The positioning rod 1181 is stuck in the air outlet channel 104, playing a role in aligning the central axis of the limiting cylinder 111 with the central axis of the cylindrical groove 105. The upper end surface of the support arm 1182 contacts the lower end surface of the limiting cylinder 111, and the lower end surface of the support arm 1182 contacts the bottom end surface of the cylindrical groove 105, playing a role in supporting the limiting cylinder 111; the positioning rod 1181 does not completely contact the side wall of the air outlet channel 104, and the positioning rod 1181 partially fits with the side wall of the air outlet channel 104, ensuring that the internal air flow channel 112 communicates with the air outlet channel 104.

[0056] Furthermore, in order to allow a large flow of gas to pass through the space between the internal air flow channel 112 and the air outlet channel 104, the positioning support 118 is of a housing structure, forming a positioning support cavity 1183, as Figure 18 shown. Part of the air flow enters the air outlet channel 104 from the internal air flow channel 112, and another part of the air flow flows from the outside of the positioning support 118 to the air outlet channel 104.

[0057] The first sealing gasket 108, the second sealing gasket 109, and the third sealing gasket 114 are made of silicone rubber material, which deforms under extrusion and returns to its original state after the external force is removed, ensuring the sealing effect.

[0058] The connection structure of the gas pipeline provided by the embodiment of the present utility model simplifies the connection method. Compared with the traditional connection method, the connection structure of this gas pipeline can not only reduce the connection time and labor cost, but also ensure the sealing performance of the connection structure of the gas pipeline.

[0059] Working principle:

[0060] During the process of inserting the intake straight pipe 200 into the gas path connector 100, the central axes of the gas path connector 100 and the intake straight pipe 200 coincide. The first sealing washer 108 and the second sealing washer 109 are respectively in close contact with the outer side of the intake straight pipe 200. The air hole 202 of the intake straight pipe 200 passes through the buffer zone 110 between the first sealing washer 108 and the second sealing washer 109. After the bottom port of the intake straight pipe 200 contacts the upper bottom surface of the frustum seat 117, the intake straight pipe 200 further pushes the frustum seat 117 to move towards the limiting cylinder 111, and the spring 116 is compressed by the movable column 115. The bottom air hole 202 of the intake straight pipe 200 further moves downward towards the cylindrical groove 105 after passing through the buffer zone 110. When the lower bottom surface of the frustum seat 117 abuts against the open end of the limiting cylinder 111, the frustum seat 117 stops moving. At this time, the air hole 202 moves to the internal space below the second sealing washer 109. The gas from the front pipeline reaches the air hole 202 through the intake channel 201 and then enters the internal space, and flows through the internal air flow channel 112 to the outlet channel 104, and flows out of the connection structure of the gas pipeline to the rear pipeline, as Figure 4 shown.

[0061] When the bottom end of the intake straight pipe 200 moves towards the upper end of the joint body 101 and the movable column 115 loses the pressure of the intake straight pipe 200, the spring 116 rebounds. The intake straight pipe 200 and the frustum seat 117 move synchronously. After the side surface of the frustum seat 117 abuts against the second sealing washer 109, the intake straight pipe 200 is separated from the frustum seat 117. Then the intake straight pipe 200 is removed from the gas path connector 100. In this way, the automatic reset of the frustum seat 117 can be realized, which is more convenient to use. At the same time, it avoids the entry of external gas into the internal space of the gas path connector 100 during the process of removing the intake straight pipe 200 from the gas path connector 100, affecting the purity of the gas introduced next time.

[0062] Finally, it should be noted that: the above-mentioned embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A gas pipeline connection structure, characterized in that: It comprises an air circuit joint (100) and an air intake straight pipe (200) movably connected to the air circuit joint (100); The interior of the air intake straight pipe (200) is an air intake passage (201), and the bottom end of the air intake straight pipe (200) is provided with at least one air hole (202) along the circumference; The gas path connector (100) comprises a cylindrical connector body (101), the upper end of the connector body (101) being an air inlet end (102); the lower end of the connector body (101) being an air outlet end (103), and the air outlet end (103) being provided with an air outlet passage (104) along the axial direction; A cylindrical groove (105) is provided inside the air inlet end (102), a first annular groove (106) and a second annular groove (107) are provided inside the cylindrical groove (105) along the circumferential direction and are arranged axially at intervals, a first sealing gasket (108) and a second sealing gasket (109) are provided in the first annular groove (106) and the second annular groove (107), respectively, a buffer zone (110) is formed in the cylindrical groove (105) space between the first sealing gasket (108) and the second sealing gasket (109), and the air inlet straight pipe (200) is movably sleeved in the first sealing gasket (108) and the second sealing gasket (109); A limiting cylinder (111) is arranged in the cylindrical groove (105) and coincides with the central axis of the cylindrical groove (105); the limiting cylinder (111) is a cylindrical structure with an open upper end and a closed lower end; the outer diameter of the limiting cylinder (111) is smaller than the diameter of the cylindrical groove (105); an internal air flow channel (112) communicating with the air outlet channel (104) is formed between the limiting cylinder (111) and the inner wall of the joint body (101); The inner cavity of the limiting cylinder (111) is provided with a movable column (115), and the central axis of the movable column (115) coincides with the central axis of the limiting cylinder (111); the top end of the movable column (115) is connected with a truncated pedestal seat (117), and the central axes of the truncated pedestal seat (117) and the movable column (115) coincide with each other; the diameter of the upper bottom surface of the truncated pedestal seat (117) is smaller than the diameter of the lower bottom surface, and the lower bottom surface of the truncated pedestal seat (117) is fixedly or detachably connected to the movable column (115); the diameter of the lower bottom surface of the truncated pedestal seat (117) is larger than the inner diameter of the limiting cylinder (111), and the truncated pedestal seat (117) is movable between the limiting cylinder (111) and the second sealing gasket (109); the bottom port of the air intake straight pipe (200) is movably connected to the upper bottom surface of the truncated pedestal seat (117); A spring (116) is arranged in the inner cavity of the limiting cylinder (111), one end of the spring (116) is fixed at the middle position of the bottom surface of the inner cavity of the limiting cylinder (111), and the other end of the spring (116) is against the bottom surface of the movable column (115); A positioning support (118) is fixedly provided on the lower end surface of the limiting cylinder (111), so that the central axis of the limiting cylinder (111) coincides with the central axis of the cylindrical groove (105), and the internal air flow channel (112) is communicated with the air outlet channel (104).

2. The gas pipeline connection structure according to claim 1, characterized in that: A third annular groove (113) is provided in the inner cavity of the limiting cylinder (111) near the opening position along the circumferential direction, a third sealing gasket (114) is provided in the third annular groove (113), a movable column (115) is sleeved in the third sealing gasket (114), and the movable column (115) slides in the third sealing gasket (114).

3. The gas pipeline connection structure according to claim 1, characterized in that: The positioning support member (118) comprises a positioning rod (1181) and at least one support arm (1182) located on the top surface of the positioning rod (1181), the upper end surface of the support arm (1182) contacts the lower end surface of the limiting cylinder (111), the lower end surface of the support arm (1182) contacts the bottom end surface of the cylindrical groove (105), and the positioning rod (1181) is not completely in contact with the side wall of the air outlet channel (104).

4. The gas pipeline connection structure according to claim 3, characterized in that: The positioning support member (118) is a shell structure, and a positioning support member cavity (1183) is formed inside the positioning support member (118).

Images