Sealing cap liquid level switch locking joint

Abstract

The utility model discloses a sealing cap liquid level switch locking joint, which relates to the field of oil gas recovery and comprises a sealing cap component, a locking joint component and a liquid level switch. A round hole is formed in the top of the sealing cap assembly, and the liquid level switch penetrates through the round hole. The locking connector assembly comprises a welding outer wire, a lower gasket, a packing, an upper gasket and a sealing nut. The welding external wire is of a hollow structure, an external thread is arranged on the outer wall of the welding external wire, and the welding external wire is fixed above the round hole in the top of the sealing cap assembly; the lower gasket, the packing and the upper gasket are sequentially arranged in an inner cavity of the welding outer wire from bottom to top, the diameter of the lower gasket is larger than that of the round hole, and internal threads are arranged on the inner wall of the sealing nut and correspond to external threads of the welding outer wire. The packing is of a hollow structure, and the inner wall of the packing is tightly attached to the outer wall of the liquid level switch. The liquid level switch is locked through the combination of the locking connector assembly, and the sealing pressure can be adjusted and maintained at any time.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas recovery, in particular to a locking joint for a sealing cap liquid level switch. Background Art

[0002] With the increase of the country's environmental protection governance efforts and the increasing attention of the owner units to oil and gas recovery. At present, many oil storage depots and refineries in China have set up oil and gas recovery systems, and the oil tank trucks for transportation are also equipped with oil and gas recovery facilities to recover the volatile oil and gas, which greatly improves the problem of oil and gas volatilization during the loading process and achieves good social and economic benefits. In the process of oil and gas recovery, airtight loading is the key link of oil and gas recovery.

[0003] At present, the sealing cap liquid level switch is generally installed on the panel of the sealing cap by assembly. Due to the deficiency in the design of the locking joint, there is a gap at the fixed part of the liquid level switch and the sealing cap panel, resulting in the leakage of oil and gas, a strong smell, and potential safety hazards.

[0004] The above reasons lead to oil and gas leakage during the loading process of oil tank trucks, which brings great difficulties to the volatilization collection and recovery of oil and gas. Due to the leakage gap, the tightness between the sealing cap and the tank truck is not good, the oil and gas recovery pipeline cannot meet the set pressure requirements, and the oil and gas recovery system cannot be used normally, affecting the utilization efficiency of the oil and gas recovery device.

[0005] Therefore, it is urgent to develop a locking joint for a sealing cap liquid level switch to solve the above problems. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a locking joint for a sealing cap liquid level switch aiming at the deficiencies of the above-mentioned prior art.

[0007] To solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A locking joint for a sealing cap liquid level switch includes a sealing cap assembly, a locking joint assembly and a liquid level switch; a round hole is opened at the top of the sealing cap assembly, and the liquid level switch passes through the round hole; the locking joint assembly includes a welded external thread, a lower gasket, a packing, an upper gasket and a sealing nut; the welded external thread is of a hollow structure and has an external thread on the outer wall, and is fixed above the round hole at the top of the sealing cap assembly; the lower gasket, the packing and the upper gasket are sequentially arranged in the inner cavity of the welded external thread from bottom to top, the diameter of the lower gasket is larger than the diameter of the round hole, the inner wall of the sealing nut is provided with an internal thread corresponding to the external thread of the welded external thread; the packing is of a hollow structure, and the inner wall of the packing closely adheres to the outer wall of the liquid level switch.

[0009] Through the combination of the locking joint assembly, the utility model locks the liquid level switch, can adjust and maintain the sealing pressure at any time. Coupled with the self-filling characteristic of the packing under pressure, the sealing device has a good sealing effect, achieving a good sealing effect, preventing oil and gas leakage, and improving the utilization efficiency of the oil and gas recovery device.

[0010] As a further preference of the utility model, the sealing cap assembly includes a conical sealing cap, a sealing cap panel and bolts; the sealing cap panel is connected to the top of the conical sealing cap through bolts, and the round hole is opened at the top of the sealing cap panel.

[0011] As a further preference of the utility model, the conical sealing cap is a fluororubber sealing ring. The fluororubber sealing ring is made of a copolymer of vinyl fluoride and hexafluoropropylene. A ring-shaped cover composed of one or several parts is fixed on one ring or washer of the bearing and contacts or forms a narrow labyrinth gap with the other ring or washer to prevent lubricating oil from leaking out and foreign objects from invading.

[0012] As a further preference of the utility model, both the upper washer and the lower washer are provided with oblique cutting grooves. When the liquid level switch is inserted, it can be divided into two parts, and after the liquid level switch is inserted, it can be combined into one component for assembly.

[0013] As a further preference of the utility model, the outer surface of the sealing nut is provided with a knurled structure, which plays an anti-slip role during manual pre-tightening.

[0014] As a further preference of the utility model, the bolt is an M10 bolt pair.

[0015] As a further preference of the utility model, the packing is graphite packing. The graphite packing is mainly made of various reinforced fibers, metal wires and other reinforced graphite wires woven with precision. The graphite packing in the utility model is formed by labyrinth weaving, with a long service life, good sealing performance, low price and high cost performance. The sealing packing made of graphite packing has excellent wear resistance, which can reach dozens of times that of ordinary sealing rings. The graphite packing does not react with many chemical substances at normal temperature and can operate stably in a relatively harsh chemical environment.

[0016] The utility model has the following beneficial effects:

[0017] 1. Through the combination of the locking joint assembly, the utility model locks the liquid level switch, can adjust and maintain the sealing pressure at any time. Coupled with the self-filling characteristic of the packing under pressure, the sealing device has a good sealing effect, achieving a good sealing effect, preventing oil and gas leakage, and improving the utilization efficiency of the oil and gas recovery device.

[0018] 2. The design of the utility model is simple. Through simple installation and combination, the usage effect can be achieved, which is convenient for installation and use. The sealing nut and the welded external thread are in threaded connection. During the replacement process, only need to unscrew the sealing nut, then extract the graphite packing, and replace it with a new sealing filler.

[0019] 3. The utility model is easier to integrate with the existing liquid level and can ensure the safe use of the sealing cap. In this way, the manufacturing cost and application cost of the fluid loading arm can be reduced, so as to facilitate the popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the utility model;

[0021] Figure 2 is the structural schematic diagram of the sealing cap assembly;

[0022] Figure 3 is the overall structural schematic diagram of the locking joint assembly;

[0023] Figure 4 is the exploded schematic diagram of the locking joint assembly;

[0024] Figure 5 is the structural schematic diagram of the graphite packing of the utility model;

[0025] Figure 6 is the cross-sectional view when the locking joint assembly and the liquid level switch are locked;

[0026] Figure 7 is the structural schematic diagram of the liquid level switch.

[0027] Among them: 1. Sealing cap assembly; 1.1 Conical sealing cap; 1.2 Sealing cap panel; 1.3 Bolt; 2. Locking joint assembly; 2.1 Welded external thread; 2.2 Lower washer; 2.3 Graphite packing; 2.4 Upper washer; 2.5 Sealing nut; 3. Liquid level switch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following further details the utility model in conjunction with the drawings and specific preferred embodiments.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not represent the importance of the components, so it cannot be understood as a limitation to the present utility model. The specific dimensions adopted in this embodiment are only for illustrating the technical solution by way of example and do not limit the protection scope of the present utility model.

[0030] As Figure 1-7 shown, a locking joint for a sealed cap liquid level switch includes a sealed cap assembly 1, a locking joint assembly 2, and a liquid level switch 3; a round hole is provided at the top of the sealed cap assembly 1, and the liquid level switch 3 passes through the round hole; the locking joint assembly 2 includes a welded external thread 2.1, a lower gasket 2.2, packing, an upper gasket 2.4, and a sealing nut 2.5; the welded external thread 2.1 is of a hollow structure, and an external thread is provided on the outer wall, which is fixed above the round hole at the top of the sealed cap assembly 1; the lower gasket 2.2, the packing, and the upper gasket 2.4 are sequentially arranged in the inner cavity of the welded external thread 2.1 from bottom to top. The diameter of the lower gasket 2.2 is larger than the diameter of the round hole. The inner wall of the sealing nut 2.5 is provided with an internal thread, which is machined corresponding to the external thread of the welded external thread 2.1; the packing is of a hollow structure, and the inner wall of the packing closely adheres to the outer wall of the liquid level switch 3. The welded external thread 2.1, the lower gasket 2.2, the upper gasket 2.4, and the sealing nut 2.5 are all parts made of metal processing.

[0031] Through the combination of the locking joint assembly 2 of the present utility model, the liquid level switch 3 is locked, and the sealing pressure can be adjusted and maintained at any time. Coupled with the self-filling characteristic of the packing under pressure, the sealing effect of this sealing device is good, achieving a good sealing effect, preventing oil and gas from leaking, and improving the utilization efficiency of the oil and gas recovery device.

[0032] The sealing nut 2.5 and the welded external thread 2.1 play a role in pressing and sealing, and can be pre-tightened at any time during use. A sealing cavity is formed between the upper gasket 2.4, the lower gasket 2.2, and the sealing nut 2.5. The sealing material is graphite packing 2.3, which has excellent wear resistance and stability.

[0033] The sealed cap assembly 1 includes a conical sealed cap 1.1, a sealed cap panel 1.2, and a bolt 3; the sealed cap panel 1.2 is connected to the top of the conical sealed cap 1.1 through the bolt 3, and the round hole is provided at the top of the sealed cap panel 1.2. The bolt 3 is an M10 bolt pair.

[0034] The round hole on the surface of the sealing cap panel 1.2 has a size of φ30mm, which can pass through the liquid level switch 3 and can hold the lower gasket 2.2 in place without dropping.

[0035] The conical sealing cap 1.1 is a fluororubber sealing ring. The fluororubber sealing ring is a sealing ring made of a copolymer of vinyl fluoride and hexafluoropropylene. It is an annular cover composed of one or several parts, fixed on one ring or gasket of the bearing and contacting or forming a narrow labyrinth gap with the other ring or gasket to prevent the leakage of lubricating oil and the intrusion of foreign objects. Moreover, the fluororubber sealing ring has its own compensation property and has good sealing performance with the tanker opening.

[0036] Both the upper gasket 2.4 and the lower gasket 2.2 are provided with diagonal cutting grooves. When the liquid level switch 3 is inserted, it can be divided into two parts, and after the liquid level switch 3 is inserted, it can be combined into one component for assembly, playing a self-tightening role.

[0037] The outer surface of the sealing nut 2.5 is provided with a knurled structure, which plays an anti-slip role during manual pre-tightening.

[0038] The packing is graphite packing 2.3. The graphite packing 2.3 is mainly made of graphite wires reinforced by various reinforcing fibers, metal wires, etc. through precision weaving. The graphite packing 2.3 in the present utility model is formed by labyrinth weaving, with a long service life, good sealing performance, low price and high cost performance. The sealing packing made of graphite packing 2.3 has extremely good wear resistance, which can reach dozens of times that of ordinary sealing rings. The graphite packing 2.3 does not react with many chemical substances at room temperature and can operate stably in a relatively harsh chemical environment.

[0039] The sealing nut 2.5 rotates and presses down on the welded external thread 2.1 through a threaded structure, compressing the upper gasket 2.4. The acting force of the upper gasket 2.4 is applied to the top of the graphite packing 2.3. The bottom of the graphite packing 2.3 is provided with a lower gasket 2.2. By squeezing the graphite packing 2.3 to become smaller, and then squeezing it tightly against the hard tube of the liquid level switch 3, a sealing effect is achieved.

[0040] The working principle and implementation plan of this solution:

[0041] The assembler installs the liquid level switch 3 and passes through the welded external thread 2.1, graphite packing 2.3, sealing nut 2.5, and lower washer 2.2 from bottom to top. The bevel-cut structure is installed and pressed into the inner cavity of the welded external thread 2.1 in sequence. After the graphite packing 2.3 is cut to an appropriate length, it is segmented and pressed into the inner cavity of the welded external thread 2.1 in sequence, and compacted. The upper washer 2.4 is installed on the upper part of the graphite packing 2.3. The sealing nut 2.5 is screwed into the welded external thread 2.1 by thread. By continuously rotating and pressing down, the lower washer 2.2, graphite packing 2.3, and upper washer 2.4 are pressed in sequence; the extrusion forces of the lower washer 2.2 and upper washer 2.4 act on the graphite packing 2.3, and the graphite packing 2.3 is compressed to squeeze the rigid pipe part of the liquid level switch 3. Through continuous extrusion, a good sealing effect is achieved.

[0042] In this way, the manufacturing cost of the locking joint of the sealing cap liquid level switch and the application cost of the sealing cap can be reduced, which is convenient for on-site personnel to carry out relevant operations, so as to facilitate popularization and use.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A locking joint for a sealed cap liquid level switch, characterized in that: It includes a sealing cap assembly (1), a locking joint assembly (2) and a liquid level switch (3); A circular hole is formed at the top of the sealing cap assembly (1), and the liquid level switch (3) is arranged through the circular hole; The locking joint assembly (2) includes a welded external thread (2.1), a lower washer (2.2), packing, an upper washer (2.4) and a sealing nut (2.5); the welded external thread (2.1) is of a hollow structure, and an external thread is provided on the outer wall, and it is fixed above the circular hole at the top of the sealing cap assembly (1); the lower washer (2.2), the packing and the upper washer (2.4) are sequentially arranged in the inner cavity of the welded external thread (2.1) from bottom to top. The diameter of the lower washer (2.2) is larger than the diameter of the circular hole. The inner wall of the sealing nut (2.5) is provided with an internal thread corresponding to the external thread of the welded external thread (2.1); the packing is of a hollow structure, and the inner wall of the packing closely adheres to the outer wall of the liquid level switch (3).

2. The locking joint of the sealed cap liquid level switch according to claim 1, characterized in that: The sealing cap assembly (1) includes a conical sealing cap (1.1), a sealing cap panel (1.2) and bolts (3); the sealing cap panel (1.2) is connected to the top of the conical sealing cap (1.1) through bolts (3), and the circular hole is formed at the top of the sealing cap panel (1.2).

3. A locking joint for a sealed cap liquid level switch according to claim 2, characterized in that: The conical sealing cap (1.1) is a fluororubber sealing ring.

4. A locking joint for a sealed cap liquid level switch according to claim 1, characterized in that: Both the upper washer (2.4) and the lower washer (2.2) are provided with diagonal cut grooves.

5. A locking joint for a sealed cap liquid level switch according to claim 1, characterized in that: A knurled structure is provided on the outer surface of the sealing nut (2.5).

6. A locking joint of a sealed cap liquid level switch according to claim 2, characterized in that: The bolts (3) are M10 bolt pairs.

7. A locking joint for a sealed cap liquid level switch according to claim 1, characterized in that: The packing is a graphite packing (2.3).

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