Sealing structure for plug-in type connector of vacuum heat insulation pipeline

Abstract

The utility model discloses a vacuum heat insulation pipeline plug-in type connector sealing structure which comprises a female plug and a male plug inserted into an inner pipe of the female plug, the male plug is provided with a male plug sealing section, the surface of the male plug sealing section is provided with a plurality of annular boss sealing faces, the position, close to a port, of the male plug sealing section is arranged in a conical shape, and the male plug sealing section is provided with a plurality of annular boss sealing faces. The female plug is provided with a female plug sealing section, the female plug sealing section is provided with a smooth sealing surface, and the male plug sealing section with a plurality of annular boss sealing surfaces is matched with the female plug sealing section to realize narrow linear sealing. By means of the mode, the sealing structure of the plug-in type connector of the vacuum heat insulation pipeline has the advantages that the connection sealing position of the male plug and the female plug of the plug-in type connector is upgraded to be the equal-diameter annular boss sealing face, the narrow-line type annular sealing effect is achieved, and the sealing structure can meet the pipeline conveying requirement of low-temperature media including small-molecule low-temperature liquid such as liquid hydrogen; therefore, the sealing performance of the vacuum heat insulation pipeline is improved when small-molecule low-temperature liquid level conveying is applied.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature liquid conveying technical field, especially a kind of vacuum heat insulation pipeline connector type coupler sealing structure. BACKGROUND

[0002] Vacuum heat insulation pipeline is applied to convey low temperature liquid medium, and low temperature medium in low temperature liquid storage tank station is conveyed to application terminal by pipeline.From storage tank station to application terminal, conveying pipe is various, some need to go to dozens of meters high high-rise building, some need to pass through multiple walls, so vacuum heat insulation pipeline system needs to be processed in sections in design, and pipe section design is convenient for handling and installation, which is very important design factor.

[0003] Patent No.ZL 201110399559.2 discloses a kind of vacuum heat insulation pipeline connector type coupler and its coupling method, and the coupler of pipe section is designed as flexible connector type female and male plug, as shown in Fig. Figure 1 And Fig. Figure 2 As shown, it is female plug and male plug respectively, and the sealing mode is O-ring sealing cooperation female and male plug pipe section sealing surface surface sealing at connector flange coupling place, which is convenient and flexible to install, and is favored by market.

[0004] The above-mentioned vacuum heat insulation pipeline connector type coupler adopts double sealing structure, the first sealing is the sealing surface of female plug 6' and the sealing surface of male plug 7', and the sealing is realized by the difference in shrinkage of two different metal materials under low temperature state after butt joint;The second sealing is the sealing of flange sheet 5' to the butt joint sealing ring.

[0005] The above-mentioned patent product is put into market as VIP pipeline system, and its convenient installation (only pipe section flange butt joint connection is needed) and good heat insulation performance are highly recognized by market.But some new problems are produced in long-term application process in market, mainly in two aspects:

[0006] Firstly, the butt joint surface of piece 6 and piece 7 is surface sealed, and the sealing is realized by the difference in thermal expansion and cold shrinkage of different metal materials.The sealing surface of existing patent product has large sealing area, but the pressing force value formed by the difference in cold shrinkage coefficient between piece 6 and piece 7 is certain, so the result is that the pressure value on the sealing surface is small, which reduces the sealing capacity;

[0007] When manufacturing or installation has slight size deviation, slight leakage may occur at surface sealing, which may cause frost and dew to appear at the butt joint surface of piece 5 flange;

[0008] Secondly, when pipeline conveys low temperature medium with smaller molecular structure such as liquid hydrogen, surface sealing structure is easy to leak, which affects the working performance of pipeline system.

[0009] The above is a problem that needs to be solved for the pipeline transportation of the current booming liquid hydrogen market. Content of the utility model

[0010] The utility model mainly solves the technical problem of providing a vacuum heat insulation pipeline plug-in connector sealing structure, which upgrades the male and female plug connection sealing part of the plug-in connector to an equal-diameter annular boss sealing surface, realizes a narrow line type annular sealing effect, and can be applied to the pipeline transportation requirements of low-temperature medium including liquid hydrogen and other small-molecule low-temperature liquids, so as to improve the sealing performance of the vacuum heat insulation pipeline when small-molecule low-temperature liquid (such as liquid hydrogen) is transported.

[0011] To solve the above technical problems, one technical scheme of the utility model is provided: a vacuum heat insulation pipeline plug-in connector sealing structure is provided, which comprises a female plug and a male plug inserted into the female plug, the male plug has a male plug sealing section, the surface of the male plug sealing section is provided with a plurality of annular boss sealing surfaces, and the male plug sealing section is arranged in a conical shape near the port,

[0012] The female plug has a female plug sealing section, the female plug sealing section has a smooth sealing surface, and the male plug sealing section with the plurality of annular boss sealing surfaces cooperates with the female plug sealing section to realize narrow line type sealing.

[0013] In a preferred embodiment of the utility model, the end of the female plug towards the male plug has a guide hole, and the male plug is inserted into the female plug through the guide hole until the male plug sealing section and the female plug sealing section are in abutment and sealing.

[0014] In a preferred embodiment of the utility model, the material of the annular boss sealing surface of the male plug sealing section has a thermal expansion and contraction coefficient smaller than that of the material of the smooth sealing surface of the female plug sealing section.

[0015] In a preferred embodiment of the utility model, the taper angle of the male plug sealing section near the port is 2-4°.

[0016] In a preferred embodiment of the utility model, the annular boss is arranged in a T shape, and the plurality of annular bosses are arranged in equal-diameter intervals.

[0017] The utility model has the advantages of:

[0018] In view of the deficiencies of the existing patent using face sealing, the male and female plug connection sealing part of the plug-in connector is upgraded to an equal-diameter annular boss sealing surface, and a narrow line type annular sealing effect is realized.

[0019] The application is suitable for pipeline transportation of low-temperature medium including small molecule low-temperature liquid such as liquid hydrogen, so as to improve the sealing performance of the vacuum heat insulation pipeline in the small molecule low-temperature liquid pipeline transportation application (such as liquid hydrogen).

[0020] Meanwhile, the male and female plug butt joint surfaces are designed in taper fitting, which is more convenient for installation and butt joint and reduces the coaxial deviation. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 is a structural schematic view of a preferred embodiment of the female plug of the vacuum heat insulation pipeline plug-in connector related by the background art;

[0023] Figure 2 is a structural schematic view of a preferred embodiment of the male plug of the vacuum heat insulation pipeline plug-in connector related by the background art;

[0024] Figure 3 is a structural schematic view of a preferred embodiment of the female plug of the vacuum heat insulation pipeline plug-in connector of the present application;

[0025] Figure 4 is a structural schematic view of a preferred embodiment of the male plug of the vacuum heat insulation pipeline plug-in connector of the present application;

[0026] Figure 5 is an A-A view of Figure 4 ;

[0027] Figure 6 is a partial enlarged view in Figure 4 ;

[0028] The marks of the components in the drawings are as follows:

[0029] 5', flange piece, 6', female plug sealing surface, 7', male plug sealing surface,

[0030] 1, female plug, 1-1, female plug sealing section, 1-2, smooth sealing surface, 1-3, guide hole, 2, male plug, 2-1, male plug sealing section, 2-2, annular boss. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0033] The present application relates to a preferred embodiment of a vacuum insulated pipe connector sealing structure.

[0034] Referring to Figures 3 to 6 , the vacuum insulated pipe connector sealing structure comprises a female plug 1 and a male plug 2 inserted into the pipe of the female plug 1.

[0035] The male plug 2 has a male plug sealing section 2-1, the female plug 1 has a female plug sealing section 1-1, and the male plug 2 and the female plug 1 are connected after the male plug sealing section 2-1 and the female plug sealing section 1-1 are connected to form a sealing surface.

[0036] The end of the female plug 1 towards the male plug 2 has a guide hole 1-3, and the male plug 2 is inserted into the female plug 1 through the guide hole 1-3 until the male plug sealing section 2-1 and the female plug sealing section 1-1 are connected to seal.

[0037] In an exemplary embodiment, the male plug sealing section 2-1 is arranged in a conical shape near the port, and the surface of the male plug sealing section 2-1 is provided with a plurality of annular bosses 2-2 to form an annular boss sealing surface, and the female plug sealing section 1-1 has a smooth sealing surface 1-2, and the male plug sealing section 1 with the plurality of annular boss sealing surfaces 2-2 cooperates with the female plug sealing section 1-1 to achieve narrow line type sealing.

[0038] The port of the male plug sealing section 2-1 is arranged in a conical shape, and the taper angle of the male plug sealing section near the port is 2-4°, which can ensure that the insertion process of the male plug 2 and the female plug 1 is more convenient and smooth.

[0039] Preferably, the taper angle of the male plug sealing section near the port is in the range of 3°.

[0040] Further, the annular boss 2-2 is provided in a T shape, and the design of the multi-channel annular boss sealing surface can replace the original surface sealing surface, form a multi-channel annular boss sealing surface, reduce the sealing area, and improve the pressure value of the sealing surface to effectively improve the sealing effect.

[0041] Further, the multi-channel annular boss 2-2 is uniformly distributed in equal diameters, which ensures that the stress of the annular boss sealing surface is uniform after the male plug sealing section cooperates with the female plug sealing section, so as to ensure good sealing effect.

[0042] In an exemplary embodiment, the material thermal expansion and contraction coefficient of the annular boss sealing surface of the male plug sealing section is smaller than the material thermal expansion and contraction coefficient of the smooth sealing surface of the female plug sealing section.

[0043] The working principle of the sealing structure of the vacuum heat insulation pipeline connector is as follows:

[0044] When liquid hydrogen and other low-temperature media are introduced, the material thermal expansion and contraction coefficient of the annular boss sealing surface of the male plug sealing section is small and basically does not shrink, and the material thermal expansion and contraction coefficient of the smooth sealing surface of the female plug sealing section is large and produces obvious shrinkage, and due to the large difference in thermal expansion and contraction performance of the two sealing surface materials, the smooth sealing surface of the female plug sealing section tightly holds the annular boss sealing surface of the male plug sealing section,

[0045] The annular boss sealing surface is used to replace the original surface sealing surface at the butt joint sealing position of the female and male plugs, the sealing area is reduced, the pressure value of the sealing surface is improved, and the sealing effect is effectively improved.

[0046] The sealing structure of the vacuum heat insulation pipeline connector has the following beneficial effects:

[0047] In view of the deficiencies caused by the surface sealing of the existing patent, the female and male plug connection sealing position of the connector is upgraded to an equal-diameter annular boss sealing surface, and a narrow-line annular sealing effect is realized.

[0048] The sealing structure is suitable for pipeline transportation requirements of low-temperature media including liquid hydrogen and other small-molecule low-temperature liquids, so as to improve the sealing performance of the vacuum heat insulation pipeline when small-molecule low-temperature liquids such as liquid hydrogen are transported.

[0049] Meanwhile, the female and male plug butt joint surfaces are designed to be tapered and matched, which is more convenient for installation and butt joint and reduces the coaxial deviation.

[0050] The above is only an embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion according to the content of the utility model specification, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A vacuum insulated pipe plug-in connector sealing structure, comprising: The female plug and the male plug inserted into the inner tube of the female plug are characterized in that: The male plug has a male plug sealing section, the surface of which is provided with multiple annular boss sealing surfaces, and the male plug sealing section is arranged in a conical shape near the port. The female plug has a female plug sealing section with a smooth sealing surface. The male plug sealing section with multiple annular boss sealing surfaces cooperates with the female plug sealing section to achieve narrow linear sealing.

2. The vacuum insulated pipe plug-in connector sealing structure according to claim 1, characterized in that: The end of the female plug facing the male plug has a guide hole, and the male plug is inserted into the female plug through the guide hole until the male plug sealing section and the female plug sealing section are butted and sealed.

3. The vacuum insulated pipe plug-in connector sealing structure according to claim 1, characterized in that: The thermal expansion and contraction coefficient of the material of the annular boss sealing surface of the male plug sealing section is smaller than the thermal expansion and contraction coefficient of the material of the smooth sealing surface of the female plug sealing section.

4. The vacuum insulated pipe plug-in connector sealing structure according to claim 1, characterized in that: The cone angle of the male plug sealing section near the port is 2-4 degrees.

5. The vacuum insulated pipe plug-in connector sealing structure according to claim 1, characterized in that: The annular boss is arranged in a T-shape, and the multiple annular bosses are evenly distributed with equal diameters.

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