Tightness detection method for nut pipe joint assembly

Abstract

The nut and pipe joint assembly comprises a pipe joint and a nut, the pipe joint comprises a pipe part and a connecting part, a gap is formed between the inner wall of the connecting part and the outer wall of the pipe part to form an insertion cavity, the nut is provided with a mounting groove, and the liquid storage groove comprises an outer ring and an inner ring. Liquid cavities are formed in the outer ring and the inner ring and are communicated through a plurality of capillary tubes, and liquid is contained in the inner ring; the detection method comprises the following steps. After the liquid storage tank is assembled in the mounting groove of the nut, the nut is arranged on the pipeline in a sleeving mode; the pipeline sleeved with the nut is inserted into the corresponding insertion cavity and arranged on the pipe part in a sleeving mode; when the nut is screwed, the liquid in the inner ring is squeezed into the outer ring, and when the outer ring is in an obvious liquid filling state, the nut is screwed in place. The tightness state of the nut can be clearly displayed, and follow-up maintenance is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of nuts, and in particular to a method for detecting the tightness of a nut pipe joint assembly. Background Art

[0002] At present, the photovoltaic semiconductor industry uses a large number of PFA nut pipe joint assemblies. When the nut is screwed into the pipe joint during the initial assembly, the nut will hit the limit ring after tightening and prompt the operator through the limit ring that the nut has been tightened in place, which can meet the on-site use requirements. However, when the nut pipe joint assembly is used for a long time, under the action of the alternating pressure of the medium in the pipeline, the nut will become loose, and there is no relevant indication when the nut is loose, so that the maintenance personnel cannot be provided with relevant prompts. Therefore, the maintenance personnel cannot find the loosening of the nut in time. Over time, the nut becomes looser and looser, which will cause leakage of chemical media inside the pipeline, bringing the risk of stopping production and causing economic losses, and polluting the surrounding environment. Summary of the invention

[0003] The object of the present invention is to provide a method for detecting the tightness of a nut pipe joint assembly, which method can clearly display the tightness state of the nut.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for detecting the tightness of a nut pipe joint assembly, wherein the nut pipe joint assembly is used to connect two pipelines together, and the nut pipe joint assembly comprises a pipe joint and a nut, wherein the pipe joint comprises a pipe part and a connecting part respectively sleeved on both ends of the pipe part, wherein the outer wall of the connecting part has an external thread, and a gap is provided between the inner wall of the connecting part and the outer wall of the pipe part to form an insertion cavity, and further comprises a liquid storage tank, wherein the nut has an installation groove for accommodating the liquid storage tank inside, wherein the liquid storage tank comprises an outer ring and an inner ring, wherein the outer ring and the inner ring both have liquid cavities inside and are connected through a plurality of capillaries, wherein the liquid cavity of the inner ring contains a liquid that can be distinguished from the color of the outer ring, and the inner ring is made of an elastic material; the detection method comprises the following steps;

[0006] S1. After assembling the liquid storage tank into the installation groove of the nut, put the nut on the corresponding pipeline;

[0007] S2, insert the pipe with the nut into the corresponding insertion cavity, and put the connector of the pipe on the end of the pipe;

[0008] S3. Screw the nut inward along the external thread of the corresponding connection part so that the liquid in the inner ring is squeezed into the outer ring. When the outer ring is observed to be obviously filled with liquid, it means that the nut has been tightened into place.

[0009] In a specific implementation of the present invention: when it is observed that the liquid in the outer ring liquid cavity is significantly reduced, it means that the nut is loose.

[0010] In a specific implementation manner of the present invention: the outer ring, the capillary tube and the inner ring are all made of elastic materials.

[0011] In a specific implementation manner of the present invention: the elastic material is transparent polyurethane or white rubber.

[0012] In a specific embodiment of the present invention: the mounting groove includes a groove arranged on the outer end surface of the nut and capable of accommodating an outer ring, an annular groove arranged on the inner wall of the nut and capable of accommodating an inner ring, and a plurality of vertical grooves arranged on the inner wall of the nut and capable of accommodating capillaries.

[0013] In a specific embodiment of the present invention, a bead-type joint is provided between the connecting head of the pipeline and the end of the pipe portion of the pipe joint. With this structure, the bead-type joint can play a sealing role to prevent leakage of the medium in the pipeline.

[0014] In a specific implementation manner of the present invention: the liquid is a red viscous liquid.

[0015] In a specific implementation manner of the present invention: covers for stopping and limiting nuts are respectively provided at both ends of the outer peripheral surface of the pipe joint.

[0016] In summary, the method for detecting the tightness of a nut pipe joint assembly of the present invention can clearly display the tightness status of the nut. When the nut becomes loose, maintenance personnel can promptly discover and repair it to prevent leakage of the medium in the pipeline, thereby improving production safety and reducing production and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the nut pipe joint assembly of the present invention;

[0019] Figure 2 is a cross-sectional view of the nut pipe joint assembly of the present invention;

[0020] Figure 3 is a cross-sectional view of a storage tank of the present invention;

[0021] Figure 4 It is a cross-sectional view of the nut of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 and Figure 2 As shown, the present invention is a method for detecting tightness of a nut pipe joint assembly. The nut pipe joint assembly is used to connect two pipelines 9 together. The nut pipe joint assembly includes a pipe joint 10 and a nut 20.

[0024] The pipe joint 10 includes a pipe portion 11 and connecting portions 12 respectively sleeved on both ends of the pipe portion 11. The outer wall of the connecting portion 12 has an external thread 121 that matches the nut 20. A gap is formed between the inner wall of the connecting portion 12 and the outer wall of the pipe portion 11 to form an insertion cavity 13. The diameter of the pipe portion 11 is slightly larger than the diameter of the pipeline.

[0025] Combination Figure 3 As shown, the nut pipe joint assembly also includes a liquid reservoir 14. The liquid reservoir 14 includes an outer ring 141 and an inner ring 142. The outer ring 141 and the inner ring 142 both have liquid cavities inside and are connected through a plurality of capillaries 144. The liquid cavity of the inner ring 142 contains a liquid 145 that can be distinguished from the color of the outer ring. Here, a hole is first opened on the inner ring 142, and then the liquid 145 is injected into the inner ring 142, and finally the hole is sealed. Since the diameter of the capillary 144 is relatively thin, the liquid will not enter the outer ring 141 initially. In this embodiment, the liquid 145 can be a red viscous liquid.

[0026] In this embodiment, the outer ring 141, the capillary tube 144 and the inner ring 142 are an integrally formed structure and are made of an elastic material, wherein the elastic material may be transparent polyurethane or white rubber.

[0027] Combination Figure 4 As shown, there is a mounting groove capable of accommodating the liquid storage tank 14 inside the nut 20. In this embodiment, the mounting groove includes a groove 22 disposed on the outer end surface 21 of the nut 20 capable of accommodating the outer ring, and an annular groove 23 disposed on the inner wall of the nut capable of accommodating the inner ring and a plurality of vertical grooves 24 capable of accommodating the capillary 144.

[0028] The detection method includes the following steps:

[0029] S1. After assembling the liquid storage tank 14 into the installation groove of the corresponding nut 20, the nut 20 is sleeved on the corresponding pipeline 9;

[0030] S2, insert the two pipes 9 with nuts 20 into the two insertion cavities 13 of the joint pipe 10 respectively, and put the connector 901 of the pipe 9 on the end of the corresponding pipe part 11;

[0031] S3. Tighten each nut 20 along the external thread 121 of the corresponding connecting part 12. During the tightening process of the nut 20, the inner ring 142 will be squeezed and deformed by the connector 901, so that the liquid in the liquid cavity of the inner ring 142 will be squeezed into the liquid cavity of the outer ring 141. The change in the amount of liquid in the liquid cavity of the outer ring can be seen through the refraction of the outer ring. When it is observed that the outer ring 141 is obviously filled with liquid due to receiving the liquid, it means that the nut 20 has been tightened into place, and then stop tightening.

[0032] It should be noted that initially, the liquid cavity of the outer ring has enclosed air, and during the extrusion process, the liquid cavity of the outer ring will not be filled with liquid due to the presence of the enclosed air. However, even if the liquid does not fill the liquid cavity of the outer ring, the refraction of the outer ring visually presents a liquid-filled state.

[0033] When the amount of liquid in the outer ring liquid cavity is significantly reduced, it indicates that the nut needs to be tightened. This is because after the nut is loosened, the extrusion force on the inner ring 142 will decrease, and the inner ring 142 will rebound, causing negative pressure in the inner ring liquid cavity and the compressed air in the outer ring will squeeze the liquid in the outer ring 141 back, causing the amount of liquid in the outer ring 141 to gradually decrease.

[0034] A bead-type joint 8 is provided between the pipeline 9 and the pipe portion 11 of the pipe joint 10. During assembly, the bead-type joint 8 can be driven into the connector 901 of the pipeline 9 by a bead-type gun. With this structure, the bead-type joint can play a sealing role to prevent leakage of the medium in the pipeline.

[0035] In addition, covers 15 for stopping the limiting nuts 20 are respectively provided at both ends of the outer circumferential surface of the pipe joint 10 .

[0036] From the above, it can be seen that the tightness detection method of a nut pipe joint assembly of the present invention can clearly display the tightness status of the nut. When the nut is loose, the maintenance personnel can discover it in time and repair it in time to prevent leakage of the medium in the pipeline, thereby improving production safety and reducing production and maintenance costs.

[0037] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for detecting the tightness of a nut pipe joint assembly, wherein the nut pipe joint assembly is used to connect two pipes together, and the nut pipe joint assembly comprises a pipe joint and a nut, wherein the pipe joint comprises a pipe portion and a connecting portion respectively sleeved on both ends of the pipe portion, wherein the outer wall of the connecting portion has an external thread, and a gap is formed between the inner wall of the connecting portion and the outer wall of the pipe portion to form an insertion cavity, wherein: It also includes a liquid storage tank, wherein the nut has a mounting groove for accommodating the liquid storage tank, wherein the liquid storage tank includes an outer ring and an inner ring, wherein the outer ring and the inner ring both have liquid cavities therein and are connected through a plurality of capillaries, wherein the liquid cavity of the inner ring contains liquid that can be distinguished from the color of the outer ring, and the inner ring is made of an elastic material; the detection method includes the following steps; S1. After assembling the liquid storage tank into the installation groove of the nut, put the nut on the corresponding pipeline; S2, insert the pipe with the nut into the corresponding insertion cavity, and put the connector of the pipe on the end of the pipe; S3. Screw the nut inward along the external thread of the corresponding connection part so that the liquid in the inner ring is squeezed into the outer ring. When the outer ring is observed to be obviously filled with liquid, it means that the nut has been tightened into place.

2. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: When a significant reduction in the liquid in the outer ring liquid cavity is observed, it indicates that the nut is loose.

3. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: The outer ring, the capillary tube and the inner ring are all made of elastic material.

4. The method for detecting tightness of a nut pipe joint assembly according to claim 3, characterized in that: The elastic material is transparent polyurethane or white rubber.

5. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: The mounting groove comprises a groove arranged on the outer end surface of the nut and capable of accommodating an outer ring, an annular groove arranged on the inner wall of the nut and capable of accommodating an inner ring, and a plurality of vertical grooves capable of accommodating capillaries.

6. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: A bead-type joint is arranged between the connecting head of the pipeline and the end of the pipe portion of the pipe joint.

7. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: The liquid is a red viscous liquid.

8. The method for detecting tightness of a nut pipe joint assembly according to claim 1, characterized in that: Covers for stopping and limiting nuts are respectively arranged at two ends of the outer peripheral surface of the pipe joint.

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