Welding-free plug connecting structure with seal

Abstract

The utility model relates to a welding-free plug connection structure with a seal, which comprises a plug, a joint, a sealing element and a nut, the plug comprises three probes, and the lower part of each probe is provided with a slot for one end of a lead to insert; the connector is provided with a vertically-through stepped through hole, the upper portion of the stepped through hole is a containing cavity, the sealing piece is located in the containing cavity, the sealing piece is provided with three vertically-through wire holes, the lower portions of the wire holes are respectively used for three wires to penetrate, and the upper portions of the wire holes are respectively used for three probes to penetrate. And the nut is used for connecting the plug and the joint together and enabling the sealing element to be in an extruded deformation state. Through mechanical cooperation of all the parts, conductive connection between the probe and all the wires is achieved, sealing cooperation and stability of the positions of the wires are achieved through the sealing piece, welding connection is not adopted any more, and the requirement that welding is not allowed in some scenes is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of capacitive liquid level sensor, specifically relates to a sealed welding-free plug connection structure used with capacitive 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. Such liquid level meter has high resolution and fast dynamic response. With the continuous popularity of capacitive liquid level meter, there is a demand for measuring the liquid level of low-temperature solutions such as liquid nitrogen and LNG in low-pressure environments, especially in LNG storage tank applications. The utility model patent with authorization announcement number CN 217130968 U discloses a 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. Since it is a three-section type, the wires in the liquid level sensor have corresponding three wires. When the lead needs to be connected with the transmitter outside the gas cylinder, a plug-in connection method is generally used. However, the construction site where the LNG cylinder is located does not allow the use of a welding gun, i.e. welding cannot be used. Therefore, how to connect the wires with the plug has become a problem to be solved. SUMMARY

[0003] The utility model aims to provide a sealed welding-free plug connection structure to solve the problem of connecting the wires with the probes of the plug.

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

[0005] A sealed welding-free plug connection structure includes a plug, a connector, a sealing element, and a nut. The plug includes three probes. The lower part of the probe is provided with a slot for inserting one end of the wire.

[0006] The connector has a stepped through-hole that penetrates from top to bottom. The upper part of the stepped through-hole is a containing cavity. The sealing element is located in the containing cavity. The sealing element has three wire holes that penetrate from top to bottom. The lower part of the wire hole is for inserting three wires, respectively. The upper part of the wire hole is for inserting three probes, respectively.

[0007] The nut is used to connect the plug and the connector together, and makes the sealing element in a state of being extruded and deformed.

[0008] Further, the plug has a stepped hole that penetrates from top to bottom. The stepped hole includes a glue groove for pouring glue and forming a glue pouring part. The glue pouring part wraps the middle part of the probe.

[0009] Further, a support block is arranged in the stepped hole below the pouring glue part, and the support block is screwed in the stepped hole, and the probe passes through the support block downward.

[0010] Further, the upper part of the accommodating cavity is externally threaded for screwing with the nut, and two tapered surfaces are arranged in the accommodating cavity below the bottom, wherein the lower tapered surface is defined as the first tapered surface, and the upper tapered surface is defined as the second tapered surface, the first tapered surface is matched with the bottom of the sealing element, and the second tapered surface is matched with the bottom of the plug.

[0011] Further, the nut is sleeved on the plug.

[0012] Further, the upper part of the accommodating cavity is internally arranged with a limiting groove in the up-down direction, a ball is arranged in the limiting groove, the outer periphery of the connector is arranged with a positioning blind hole, and part of the ball is arranged in the positioning blind hole.

[0013] Further, the outer periphery of the plug is arranged with an annular protrusion, the upper annular surface of the annular protrusion forms a limiting surface, and a gasket is sleeved on the outer periphery of the plug and located between the upper end of the nut and the limiting surface.

[0014] The probe connection structure with the sealing function has the advantages that:

[0015] When the connector and the plug are increasingly tightly inserted, the sealing element is gradually deformed by extrusion, the sealing element tightly holds the wires passing therethrough, and the wires and the sealing element have a certain sealing property. Meanwhile, the sealing element can also keep the stability of the wire position, so that the wire passing upward through the sealing element can be directly mechanically connected with the probe without welding connection. The welding-free plug connection structure with the sealing function utilizes the mechanical cooperation of the components, realizes the conductive connection of the probe and the wires, realizes the sealing cooperation through the sealing element, does not adopt the welding connection mode, and meets the requirement that welding is not allowed in some scenes.

[0016] Further, the ball, the limiting groove and the positioning blind hole are arranged on the connector and the plug, in the process of screwing the nut, the connector and the plug do not relatively rotate, the connector is fixed, and the plug can only move upward and downward, so that the sealing element is not rotated to cause the wires to be twisted together in the process of tightening.

[0017] Further, the gasket is sleeved on the outer periphery of the plug and located between the upper end of the nut and the limiting surface of the plug, so that the torsion generated in the process of pressing the nut is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of the welding-free plug connection structure with the sealing function.

[0019] Figure 2 This is a cross-sectional view of a sealed, solderless plug connection structure according to this utility model;

[0020] Figure 3 This is a cross-sectional view of the plug;

[0021] Figure 4 It is a 3D diagram of the plug;

[0022] Figure 5 It is a 3D diagram of the connector;

[0023] Figure 6 This is a schematic diagram showing the fit between the wire and the seal;

[0024] Figure 7 This is a schematic diagram of the probe and the support block working together.

[0025] The names corresponding to each mark in the diagram:

[0026] 1. Plug; 2. Probe; 21. Groove; 3. Potting compound; 4. Gasket; 5. Nut; 6. Support block; 7. Ball bearing; 8. Seal; 9. Connector; 91. Limiting groove; 92. Second conical surface; 93. First conical surface; 10. Wire; 11. Adhesive groove; 12. Annular protrusion; 121. Limiting surface; 13. Positioning blind hole. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0028] Embodiments of this utility model:

[0029] like Figures 1-7 As shown, a sealed, solderless plug connection structure includes a plug 1, a connector 9, a seal 8, and a nut 5. The plug 1 includes three probes 2, which are copper pins. The seal 8 is located between the plug 1 and the connector 9, which are interlocked and tightly fitted together using the nut 5.

[0030] like Figures 2-3As shown, the plug 1 has a stepped hole through the top and bottom, which includes a glue groove 11 for pouring glue and forming a glue pouring part 3, which wraps the middle part of the probe 2. A support block 6 is arranged in the stepped hole below the glue pouring part 3, and the support block 6 is threadedly connected in the stepped hole, and the probe 2 passes through the support block 6 downward. The support block 6 is a polysulfone seat. After the support block 6 is fixed, liquid polyurethane compound is injected into the glue groove 11, and the glue pouring part 3 is formed after solidification. The position of the probe 2 is maintained by the glue pouring part 3 and the support block 6, and the stability is improved. The upper part of the plug 1 is used for plugging with the transmitter, and the exposed upper part of the probe 2 is used for electrically connecting with the transmitter.

[0031] As shown in Figure 2 and Figure 5 , the connector 9 has a stepped through hole through the top and bottom, the upper part of the stepped through hole is a containing cavity, and the sealing element 8 is located in the containing cavity. The sealing element 8 has three through holes through the top and bottom, and the lower part of the through hole is respectively provided for three wires 10 to pass in. The upper part of the through hole is respectively provided for three probes 2 to pass in. The three wires 10 are three leads of a capacitive liquid level sensor, which are passed out from an LNG cylinder and used for electrically connecting with the probes 2.

[0032] As shown in Figure 6 , Figure 7 , the lower part of the probe 2 is provided with a slot 21 for inserting one end of the wire 10; and the one end of the wire 10 is stripped in advance when connected.

[0033] As shown in Figures 1-2 , the nut 5 is sleeved on the plug 1, and the nut 5 is used for connecting the plug 1 and the connector 9 together. After the nut 5 is tightened, the sealing element 8 is in a state of being extruded and deformed.

[0034] The upper part of the containing cavity has an external thread for threadedly connecting with the nut 5.

[0035] As shown in Figure 2 and 5 , two tapered surfaces are arranged in the containing cavity at the bottom, wherein the lower one is defined as the first tapered surface 93, and the upper one is defined as the second tapered surface 92. The first tapered surface 93 cooperates with the bottom of the sealing element 8, and the second tapered surface 92 cooperates with the bottom of the plug 1. The first tapered surface 93 and the second tapered surface 92 are annular tapered surfaces. The first tapered surface 93 can apply an inclined force to the sealing element 8. When the connector 9 and the plug 1 are increasingly tightly connected, the sealing element 8 is gradually extruded and deformed because the sealing element 8 is a rubber element. At the same time, the sealing element 8 can tightly hold the wires 10, and the wires 10 and the sealing element 8 have sealing property. After the nut 5 is tightened, the second tapered surface 92 contacts the bottom end of the plug 1, which belongs to hard sealing.

[0036] As shown in Figure 5As shown in the figure, the upper part of the accommodating cavity is provided with a limiting groove 91 on the inner side, the limiting groove 91 is arranged along the up-down direction, a ball 7 is arranged in the limiting groove 91, the outer periphery of the joint 9 is provided with a positioning blind hole 13, and a part of the ball 7 is located in the positioning blind hole 13. The ball 7 is made of steel ball, and can also be made of other hard plastic. In the process of screwing the cap 5, due to the existence of the ball 7 and the limiting groove 91, the joint 9 and the plug 1 do not relatively twist. The joint 9 is fixed, so the plug 1 can only act up and down, and in the process of tightening, the sealing element 8 cannot rotate to cause the wires 10 to twist together.

[0037] As shown in the figure, Figures 2 to 4 Further, the outer periphery of the plug 1 is provided with an annular protrusion 12, the upper side of the annular protrusion 12 forms a limiting surface 121, the outer periphery of the plug 1 is sleeved with a gasket 4, and the gasket 4 is located between the upper end of the cap 5 and the limiting surface 121. The gasket 4 is a copper ring. By using the gasket 4, the torsion in the pressing process is reduced.

[0038] The utility model discloses a welding-free plug connecting structure with sealing, which utilizes mechanical cooperation of various components, realizes conductive connection of the probe and various wires, utilizes a sealing element to realize sealing cooperation, does not adopt a welding connection mode, and meets the requirement that welding is not allowed to be used in some scenes.

Claims

1. A sealed, solderless plug connection structure, characterized by: The plug comprises three probes, the lower part of the probe is provided with a slot for inserting one end of the wire; the connector has a step-through hole, the upper part of the step-through hole is a containing cavity, the sealing element is located in the containing cavity, the sealing element has three wire holes, the lower part of the wire hole is for inserting three wires, the upper part of the wire hole is for inserting three probes; The screw cap is used to connect the plug and the connector together, and makes the sealing element in the state of being extruded and deformed.

2. The sealed, solderless plug connection structure of claim 1, wherein: The plug has a step-through hole, the step-through hole comprises a glue groove for pouring glue and forming a pouring glue part, and the pouring glue part wraps the middle part of the probe.

3. The sealed, solderless plug connection structure of claim 2, wherein: A support block is arranged in the step-through hole below the pouring glue part, the support block is threadedly connected in the step-through hole, and the probe passes through the support block downward.

4. The sealed, solderless plug connection structure of claim 1, wherein: The upper part of the containing cavity has external threads for threadedly connecting with the screw cap, and two tapered surfaces are arranged in the containing cavity below the bottom, wherein the lower tapered surface is defined as the first tapered surface, and the upper tapered surface is defined as the second tapered surface, the first tapered surface cooperates with the bottom of the sealing element, and the second tapered surface cooperates with the bottom of the plug.

5. The sealed, solderless plug connection structure of claim 4, wherein: The screw cap is sleeved on the plug.

6. The sealed, solderless plug connection structure of claim 4, wherein: The upper part of the containing cavity is provided with a limiting groove on the inner side, the limiting groove is arranged in the up-down direction, a ball is arranged in the limiting groove, the outer periphery of the connector is provided with a positioning blind hole, and a part of the ball is located in the positioning blind hole.

7. The sealed, solderless plug connection structure of claim 5, wherein: The outer periphery of the plug is provided with an annular protrusion, the upper side of the annular protrusion forms a limiting surface, a gasket is sleeved on the outer periphery of the plug, and the gasket is located between the upper end of the screw cap and the limiting surface.

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