A sealing connection device for liquid helium dewar and liquid helium infusion tube

Abstract

The present invention discloses a sealing connection device for a liquid helium dewar and a liquid helium infusion tube, wherein the sealing joint comprises an external threaded sleeve, a pressure ring, a sealing ring, and an internal threaded head. The inner wall of the external threaded sleeve is provided with a limiting portion, a mounting portion, and an internal threaded portion arranged in sequence. The limiting portion is provided with a limiting protrusion extending inward, the pressure ring and the sealing ring are located in the mounting portion, the pressure ring abuts against the limiting protrusion, and the sealing ring is located on the side of the pressure ring away from the limiting protrusion, one end of the internal threaded head extends from the end away from the limiting protrusion into the external threaded sleeve to abut against the sealing ring, the outer wall of the internal threaded head is threadedly matched with the internal threaded portion of the external threaded sleeve, and the internal threaded head and the middle part of the external threaded sleeve jointly form a connecting cavity. Through the above optimized design of the sealing connection device for a liquid helium dewar and a liquid helium infusion tube, the sealing ring is subjected to extrusion deformation through the threaded installation of the internal threaded head and the external threaded sleeve, thereby realizing rapid installation and reliable sealing with the infusion tube.

Description

Technical Field

[0001] The invention relates to the field of cryogenic liquids, and in particular to a sealing connection device for a liquid helium dewar and a liquid helium infusion pipe. Background Art

[0002] The saturation temperature of liquid hydrogen and liquid helium is lower than 20K. This kind of cryogenic fluid requires a special infusion device (hereinafter referred to as an infusion tube) during the transmission process. Infusion tube - generally composed of an inner tube and an outer tube, the space formed between the inner tube and the outer tube is called a "sandwich". The sandwich is wrapped with multiple layers of insulating materials, and a high vacuum environment is established in the sandwich. The inner tube is used to transport liquid hydrogen and liquid helium and other media, and the outer tube is used to establish a vacuum sandwich with the inner tube. This infusion tube is generally available in 4 specifications, namely 6 / 8 inches, 5 / 8 inches, 4 / 8 inches and 3 / 8 inches. Liquid helium dewar - a container for liquid helium. The container is sealed when storing liquid helium. The top of this container is generally provided with a valve insertion hole, and the infusion tube is inserted into the bottom of the liquid helium dewar through this hole. After the infusion tube is inserted into the liquid helium dewar, there is a gap between the outer circle of the infusion tube and the inner circle of the insertion hole of the liquid helium dewar, and this gap cannot form a sealing effect. The sealed connection between the infusion tube and the liquid helium dewar cannot be completed. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention provides a liquid helium dewar and a liquid helium infusion tube sealing connection device.

[0004] The present invention provides a sealing connection device for a liquid helium dewar and a liquid helium infusion tube, comprising: at least one sealing joint;

[0005] The sealing joint includes an external threaded sleeve, a pressure ring, a sealing ring, and an internal threaded head. The inner wall of the external threaded sleeve is provided with a limiting portion, a mounting portion and an internal threaded portion arranged in sequence. The limiting portion is provided with a limiting protrusion extending inwardly. The pressure ring and the sealing ring are located in the mounting portion. The pressure ring abuts against the limiting protrusion and the sealing ring is located on the side of the pressure ring away from the limiting protrusion. One end of the internal threaded head extends from the end away from the limiting protrusion into the external threaded sleeve and abuts against the sealing ring. The outer wall of the internal threaded head is threadedly matched with the internal threaded portion of the external threaded sleeve, and the internal threaded head and the middle part of the external threaded sleeve jointly form a connecting cavity.

[0006] Preferably, the internal thread head comprises an external thread portion and a connecting portion which are connected in sequence, the external thread portion is threadedly matched with the internal thread portion, and the connecting portion extends from a side of the external thread portion away from the sealing ring.

[0007] Preferably, a plurality of sealing joints are included, the connection portion of the internal thread head of each sealing joint is inserted into the connection cavity of the adjacent sealing joint and the outer wall is sealingly matched with the sealing ring of the adjacent sealing joint.

[0008] Preferably, the connection portion of each internal thread head extends into the connection cavity from one side of the external thread sleeve of the adjacent sealing joint.

[0009] Preferably, the outer diameter of the connecting portion is smaller than the outer diameter of the external threaded portion.

[0010] Preferably, the pressure ring comprises a pressure plate and a surrounding plate annularly arranged around the pressure plate, and the pressure plate and the surrounding plate together form an accommodating step for accommodating the sealing ring.

[0011] Preferably, the inner wall of the mounting portion is provided with a processing groove extending in an annular manner.

[0012] Preferably, the sealing ring is made of fluororubber material.

[0013] Preferably, the external thread sleeve, the pressure ring and the internal thread head are all made of brass.

[0014] In the present invention, the proposed sealing connection device for liquid helium dewar and liquid helium infusion tube, the sealing joint includes an external threaded sleeve, a pressure ring, a sealing ring, and an internal threaded head. The inner wall of the external threaded sleeve is provided with a limiting portion, a mounting portion and an internal threaded portion arranged in sequence. The limiting portion is provided with a limiting protrusion extending inward, the pressure ring and the sealing ring are located in the mounting portion, the pressure ring abuts against the limiting protrusion and the sealing ring is located on the side of the pressure ring away from the limiting protrusion, one end of the internal threaded head extends from the end away from the limiting protrusion into the external threaded sleeve to abut against the sealing ring, the outer wall of the internal threaded head is threadedly matched with the internal threaded portion of the external threaded sleeve, and the internal threaded head and the middle part of the external threaded sleeve jointly form a connecting cavity. Through the above optimized design of the sealing connection device for liquid helium dewar and liquid helium infusion tube, the sealing ring is subjected to extrusion deformation through the threaded installation of the internal threaded head and the external threaded sleeve, thereby realizing rapid installation and reliable sealing with the infusion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a sealing joint of a liquid helium dewar and a liquid helium infusion tube sealing connection device proposed by the present invention.

[0016] Figure 2 This is a schematic structural diagram of the coordination of multiple sealing joints of a liquid helium dewar and a liquid helium infusion tube sealing connection device proposed by the present invention. DETAILED DESCRIPTION

[0017] like Figure 1 and 2 As shown, Figure 1 This is a schematic structural diagram of a liquid helium dewar and a liquid helium infusion tube sealing connection device proposed by the present invention. Figure 2 This is a schematic structural diagram of the coordination of multiple sealing joints of a liquid helium dewar and a liquid helium infusion tube sealing connection device proposed by the present invention.

[0018] Reference Figure 1, a liquid helium dewar and a liquid helium infusion tube sealing connection device proposed by the present invention comprises: at least one sealing joint;

[0019] The sealing joint includes an external threaded sleeve 1, a pressure ring 2, a sealing ring 3, and an internal threaded head 4. The inner wall of the external threaded sleeve 1 is provided with a limiting portion, a mounting portion and an internal threaded portion arranged in sequence. The limiting portion is provided with a limiting protrusion extending inward, the pressure ring 2 and the sealing ring 3 are located in the mounting portion, the pressure ring 2 abuts against the limiting protrusion and the sealing ring 3 is located on the side of the pressure ring 2 away from the limiting protrusion, one end of the internal threaded head 4 extends from the end away from the limiting protrusion into the external threaded sleeve 1 and abuts against the sealing ring 3, the outer wall of the internal threaded head 4 is threadedly matched with the internal threaded portion of the external threaded sleeve 1, and the internal threaded head 4 and the middle part of the external threaded sleeve 1 jointly form a connecting cavity.

[0020] In this embodiment, the proposed liquid helium dewar and liquid helium infusion tube sealing connection device, the sealing joint includes an external threaded sleeve, a pressure ring, a sealing ring, and an internal threaded head. The inner wall of the external threaded sleeve is provided with a limiting portion, a mounting portion and an internal threaded portion arranged in sequence. The limiting portion is provided with a limiting protrusion extending inward, the pressure ring and the sealing ring are located in the mounting portion, the pressure ring abuts against the limiting protrusion and the sealing ring is located on the side of the pressure ring away from the limiting protrusion, one end of the internal threaded head extends from the end away from the limiting protrusion into the external threaded sleeve to abut against the sealing ring, the outer wall of the internal threaded head is threadedly matched with the internal threaded portion of the external threaded sleeve, and the internal threaded head and the middle part of the external threaded sleeve jointly form a connecting cavity. Through the above-mentioned optimized design of the liquid helium dewar and liquid helium infusion tube sealing connection device, through the threaded installation of the internal threaded head and the external threaded sleeve, the sealing ring is subjected to extrusion deformation, thereby realizing rapid installation and reliable sealing with the infusion tube.

[0021] During the specific connection, an infusion tube with external threads can be used to replace the internal thread head and directly installed in the external thread sleeve, so that the sealing ring is directly sealed and matched with the outer wall of the infusion tube.

[0022] In a specific embodiment, the internal thread head 4 includes an external thread portion and a connecting portion which are connected in sequence, the external thread portion is threadedly matched with the internal thread portion, and the connecting portion extends from a side of the external thread portion away from the sealing ring 3 .

[0023] In order to adapt to different usage scenarios, refer to Figure 2 In a further specific embodiment, it includes multiple sealing joints, the connecting part of the internal thread head 4 of each sealing joint is inserted into the connecting cavity of the adjacent sealing joint and the outer wall is sealed with the sealing ring 3 of the adjacent sealing joint. During installation, each sealing joint can be sleeved on the outside of the connecting part of the internal thread head of the adjacent sealing joint through the connecting cavity, and sealed with it through the sealing ring, so as to ensure the convenience and reliability of the connection.

[0024] In a specific installation method, the connection portion of each internal thread head 4 extends into the connection cavity from one side of the external thread sleeve 1 of the adjacent sealing joint.

[0025] In the actual processing, the outer diameter of the connecting portion is smaller than the outer diameter of the external threaded portion, so that the sealing joint ensures the reliability of the connection seal while each component can be processed in a standardized manner.

[0026] In the specific design of the pressure ring, the pressure ring 2 includes a pressure plate and a surrounding plate annularly arranged around the pressure plate. The pressure plate and the surrounding plate together form an accommodating step for accommodating the sealing ring 3 to ensure the reliability of the sealing ring installation.

[0027] In a specific design of the external threaded sleeve, an inner wall of the mounting portion is provided with a processing groove extending in an annular manner.

[0028] In the selection of sealing ring materials, the sealing ring 3 is made of fluororubber material.

[0029] In other material selections, the external thread sleeve 1, the pressure ring 2, and the internal thread head 4 are all made of brass material.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing connection device for a liquid helium dewar and a liquid helium infusion tube, characterized in that: include: at least one sealing joint; The sealing joint comprises an external threaded sleeve (1), a pressure ring (2), a sealing ring (3), and an internal threaded head (4); the inner wall of the external threaded sleeve (1) is provided with a limiting portion, a mounting portion, and an internal threaded portion which are arranged in sequence; the limiting portion is provided with a limiting protrusion extending inward; the pressure ring (2) and the sealing ring (3) are located in the mounting portion; the pressure ring (2) abuts against the limiting protrusion and the sealing ring (3) is located on the side of the pressure ring (2) away from the limiting protrusion; one end of the internal threaded head (4) extends from the end away from the limiting protrusion into the external threaded sleeve (1) and abuts against the sealing ring (3); the outer wall of the internal threaded head (4) is threadedly matched with the internal threaded portion of the external threaded sleeve (1); the internal threaded head (4) and the middle part of the external threaded sleeve (1) jointly form a connecting cavity; The internal thread head (4) comprises an external thread portion and a connecting portion which are connected in sequence, the external thread portion being threadably matched with the internal thread portion, and the connecting portion extending from a side of the external thread portion away from the sealing ring (3); It comprises a plurality of sealing joints, wherein the connection portion of the internal thread head (4) of each sealing joint is inserted into the connection cavity of the adjacent sealing joint and the outer wall thereof is sealedly matched with the sealing ring (3) of the adjacent sealing joint; The connection portion of each internal thread head (4) extends into the connection cavity from one side of the external thread sleeve (1) of the adjacent sealing joint.

2. The sealing connection device for the liquid helium dewar and the liquid helium infusion tube according to claim 1, characterized in that: An outer diameter of the connecting portion is smaller than an outer diameter of the external thread portion.

3. The sealing connection device for the liquid helium dewar and the liquid helium infusion tube according to claim 1, characterized in that: The pressure ring (2) comprises a pressure plate and a surrounding plate annularly arranged around the pressure plate, and the pressure plate and the surrounding plate together form an accommodating step for accommodating the sealing ring (3).

4. The sealing connection device for the liquid helium dewar and the liquid helium infusion tube according to claim 1, characterized in that: The inner wall of the mounting portion is provided with a processing groove extending in an annular manner.

5. The sealing connection device for the liquid helium dewar and the liquid helium infusion tube according to claim 1, characterized in that: The sealing ring (3) is made of fluororubber material.

6. The sealing connection device for the liquid helium dewar and the liquid helium infusion tube according to claim 1, characterized in that: The external thread sleeve (1), the pressure ring (2) and the internal thread head (4) are all made of brass material.

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