Wire self-sealing structure for LNG liquid level sensor

Abstract

The utility model relates to the technical field of liquid level sensors, in particular to a lead self-sealing structure for an LNG (liquefied natural gas) liquid level sensor, which comprises a mounting seat, a joint and a sealing element, the mounting seat and the joint are both of hollow sleeve structures, one end of the mounting seat is used for being connected with a bent pipe on the outer side of an LNG cylinder, and a pressing part is formed at the other end of the mounting seat. The pressing part is inserted into the joint; an abutting face is arranged in the connector, and the sealing piece is in the state that the sealing piece is extruded by the abutting face and the abutting portion to deform. An external thread part is arranged at one end of the connector, a nut is connected to the external thread part, and the nut is used for keeping tight fit between the mounting seat and the connector; the sealing member is provided with three wire holes which are respectively used for a lead to pass through. Through the mechanical cooperation of the installation seat, the joint and the sealing member, the sealing problem during the arrangement of a plurality of wires is solved, and the installation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level sensor technical field, concretely relates to a wire self-sealing structure for LNG liquid level sensor. BACKGROUND

[0002] The working principle of the capacitive liquid level meter is to convert the position change of the measured object into capacitance for measurement. This liquid level meter has the advantages of high resolution and fast dynamic response. With the continuous popularity of capacitive liquid level meters, there is a demand for measuring the liquid level of low-temperature solutions (medium temperature > -200 DEG C) such as liquid nitrogen and LNG in low-pressure environments (<2.5 MPa), especially in LNG storage tank applications. The utility model patent with authorization announcement number CN 217130968 U discloses an LNG cylinder with liquid level self-calibration function, wherein the capacitive liquid level meter includes a liquid level meter outer tube and a liquid level meter inner tube. The liquid level meter inner tube is divided into three sections and constitutes three capacitive sensors with the liquid level meter outer tube, i.e. a three-section capacitive LNG liquid level sensor. Since it is a three-section type, the wires in the liquid level sensor have corresponding three wires. The wires are made of high-temperature-resistant materials to adapt to the low-temperature environment inside the cylinder. However, when the lead is connected to the transmitter outside the cylinder, there is a sealing problem. How to arrange the wires while ensuring the sealing of the cylinder. SUMMARY

[0003] The utility model discloses a wire self-sealing structure for LNG liquid level sensor, solves the sealing problem when arranging multiple wires.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The wire self-sealing structure for LNG liquid level sensor includes a mounting seat, a joint and a sealing element. The mounting seat and the joint are both hollow sleeve structures. One end of the mounting seat is used to connect with the elbow outside the LNG cylinder, and the other end forms a pressing part which is inserted into the joint. The joint is provided with an abutting surface. The sealing element is in a state of being extruded and deformed by the abutting surface and the pressing part. One end of the joint is provided with an external thread part, and a nut is connected to the external thread part. The nut is used to keep the tight fit of the mounting seat and the joint. Three wire holes are provided on the sealing element for one wire to pass through respectively.

[0006] Further, the sealing element includes a small-diameter section, a large-diameter section and a tapered section. The small-diameter section and the tapered section are located on both sides of the large-diameter section, and a first step is formed between the small-diameter section and the large-diameter section. The mounting seat has a receiving groove, and the small-diameter section is located in the receiving groove. The pressing part cooperates with the first step. The outer circumferential surface of the tapered section cooperates with the abutting surface.

[0007] Further, an annular protrusion is arranged on the outer periphery of the mounting seat, one side of the annular protrusion forms a limiting surface, and the limiting surface is in limiting cooperation with one end of the nut.

[0008] Further, the other side of the annular protrusion forms an abutting surface, and the abutting surface is a spherical surface and is in close cooperation with one end of the connector.

[0009] Further, a gasket is arranged on the outer periphery of the mounting seat, and the gasket is located between the limiting surface and one end of the nut.

[0010] Further, the gasket is a copper gasket.

[0011] Further, the sealing member is made of polytetrafluoroethylene.

[0012] The utility model discloses the beneficial effects of:

[0013] The nut is used to realize the close cooperation of the mounting seat and the connector, and indirectly exerts force on the sealing member, and after the nut is tightened, the sealing member is in the state of being extruded and deformed by the abutting surface of the connector and the pressing part of the mounting seat. Three independent wire holes are arranged on the sealing member and are used for passing one wire respectively, and the sealing member is in the state of being extruded and deformed, so that the wires are uniformly and tightly sealed, and the sealing member and the connector also have certain sealing performance. Through cooperation of the components, the sealing problem of multiple wires is solved. Without using glue and other ways, the sealing structure of the utility model is convenient to install, and is convenient for on-site construction and later maintenance. DRAWINGS

[0014] Figure 1 is the front view of the wire self-sealing structure of the LNG liquid level sensor,

[0015] Figure 2 is Figure 1 the A-A sectional view of the wire self-sealing structure of the LNG liquid level sensor,

[0016] Figure 3 is the schematic view of cooperation of the wire and the sealing member,

[0017] Figure 4 is the sectional view of the connector,

[0018] Figure 5 is the perspective view of the mounting seat.

[0019] 1, connector; 11, abutting surface; 2, mounting seat; 21, annular protrusion; 211, abutting surface; 212, limiting surface; 22, accommodating groove; 221, pressing part; 3, nut; 4, wire; 5, sealing member; 51, conical section; 52, small-diameter section; 53, large-diameter section; 6, gasket. DETAILED DESCRIPTION

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0021] Embodiments of the present application:

[0022] As shown in the drawings, Figures 1-5 The wire self-sealing structure for the LNG liquid level sensor comprises a mounting seat 2, a joint 1 and a sealing element 5. The mounting seat 2 and the joint 1 are both hollow sleeve structures. The sealing element 5 is located in the joint 1. The mounting seat 2 and the joint 1 are connected together through a nut 3.

[0023] For ease of understanding, the center line of the center hole of the mounting seat 2 and the joint 1 is along the up-down direction. The joint 1 is located above the mounting seat 2.

[0024] One end of the mounting seat 2 is used for connecting with the elbow outside the LNG cylinder. The other end forms a pressing part which is inserted into the joint 1. In the installation and use, the one end, i.e. the lower part of the mounting seat 2, is connected with the elbow by welding. Three wires 4 are led out from the elbow and then enter the mounting seat 2 and are led out from the upper part of the joint 1.

[0025] As shown in the drawings, Figure 3 The sealing element 5 is made of polytetrafluoroethylene material and is a fluorine sealing element with a certain deformation capacity. The sealing element 5 comprises a small-diameter section 52, a large-diameter section 53 and a tapered section 51. The small-diameter section 52 and the tapered section 51 are located on both sides of the large-diameter section 53. A first step is formed between the small-diameter section 52 and the large-diameter section 53. The mounting seat 2 has a receiving groove 22. The small-diameter section 52 is located in the receiving groove 22.

[0026] The pressing part of the mounting seat 2 cooperates with the first step. The pressing part of the mounting seat 2 is formed by the groove wall of the upper part of the receiving groove 22.

[0027] As shown in the drawings, Figure 4 The joint 1 is provided with an abutting surface 11. The abutting surface 11 is a tapered surface. The outer peripheral surface of the tapered section 51 cooperates with the abutting surface 11 to generate extrusion force on the sealing element 5 so that the sealing element 5 deforms.

[0028] One end of the joint 1 is provided with an external thread part. The external thread part is connected with a nut 3. As shown in the drawings, Figure 5As shown, the outer periphery of the mounting base 2 is provided with an annular protrusion 21, one side of the annular protrusion 21 forms a limiting surface 212, and the limiting surface 212 is in limiting cooperation with one end of the nut 3. The other side of the annular protrusion 21 forms an abutting surface 211, which is a spherical surface structure and is in close cooperation with one end of the connector 1, thereby forming a hard seal. Figure 2 As shown.

[0029] The nut 3 is used to keep the close cooperation of the mounting base 2 and the connector 1. After the nut 3 is tightened, the sealing element 5 is in a state of being extruded and deformed by the abutting surface 11 and the pressing part.

[0030] The sealing element 5 is provided with three independent wire holes, each of which is used to pass one wire 4. The sealing element 5 is in a state of being extruded and deformed, and uniformly holds and seals the wire 4. Therefore, there is a certain sealing between the wire 4 and the wire hole, and between the sealing element 5 and the connector 1. The sealing problem of multiple wires 4 is solved through the cooperation of several components.

[0031] During use, the pressure in the LNG cylinder can also press the sealing element 5 upward, and form automatic compression with the abutting surface 11 of the connector 1, thereby enhancing the sealing effect.

[0032] The outer periphery of the mounting base 2 is provided with a gasket 6, which is a copper gasket 6. The gasket 6 is located between the limiting surface 212 and one end of the nut 3. By providing the gasket 6, the torsion of the sealing element 5 during compression is reduced, which is more conducive to the radial compression of the sealing element 5.

Claims

1. A wire self-sealing structure for an LNG level sensor, characterized by: The application relates to a sealing device for a LNG gas cylinder, which comprises a mounting base, a joint and a sealing element, wherein the mounting base and the joint are hollow sleeve structures; one end of the mounting base is used for connecting with a bend pipe outside the LNG gas cylinder; the other end of the mounting base is provided with a pressing part which is inserted into the joint; the joint is provided with an abutting surface; the sealing element is in a state of being extruded and deformed by the abutting surface and the pressing part; one end of the joint is provided with an external thread part; a nut is connected to the external thread part; the nut is used for keeping the mounting base and the joint in tight fit; three wire holes are arranged on the sealing element and used for penetrating one wire respectively.

2. The wire self-sealing structure for an LNG level sensor according to claim 1, characterized by: The sealing element comprises a small-diameter section, a large-diameter section and a conical section; the small-diameter section and the conical section are located on two sides of the large-diameter section; a first step is formed between the small-diameter section and the large-diameter section; the mounting base is provided with a containing groove; the small-diameter section is located in the containing groove; the pressing part is matched with the first step; the outer circumferential surface of the conical section is matched with the abutting surface.

3. The wire self-sealing structure for an LNG level sensor according to claim 2, characterized by: The outer periphery of the mounting base is provided with an annular protrusion; one side of the annular protrusion is provided with a limiting surface; the limiting surface is matched with one end of the nut in limiting mode.

4. The wire self-sealing structure for an LNG level sensor according to claim 3, characterized by: The other side of the annular protrusion is provided with a close surface; the close surface is a spherical surface and is matched with one end of the joint in tight mode.

5. The wire self-sealing structure for an LNG level sensor according to claim 3, characterized by: The outer periphery of the mounting base is provided with a gasket; the gasket is located between the limiting surface and one end of the nut.

6. The wire self-sealing structure for an LNG level sensor according to claim 5, characterized by: The gasket is a copper gasket.

7. The wire self-sealing structure for an LNG level sensor according to any one of claims 1 to 6, characterized by: The sealing element is made of polytetrafluoroethylene.

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