Single-ferrule type pipe joint

Abstract

The single-ferrule type pipe joint comprises a nut, a joint body and a ferrule, the inner diameter of the end, making contact with the nut, of the ferrule is larger than that of the end, making contact with the joint body, of the ferrule, and the two ends of the ferrule are provided with cutting edges inclining downwards to form a conical shape. Conical surfaces corresponding to the cutting edge of the cutting sleeve are arranged in the nut and the joint body, a step surface is formed between the end with the larger inner diameter and the end with the smaller inner diameter, a circle of groove is formed in the step surface, and a sealing rubber ring is embedded in the groove. When the tightness of the clamping sleeve type connector is adjusted, the compressed sealing rubber ring rebounds along with the fact that the connector body is far away from the clamping sleeve and makes contact with the connector body all the time, and oil leakage caused by gaps is avoided.

Description

Technical Field

[0001] The invention relates to the field of manufacturing and processing of sealing connectors, and in particular to a single ferrule type pipe joint. Background Art

[0002] The ferrule type pipe joint is mainly composed of the joint body, ferrule and nut. When the ferrule and nut are inserted into the joint body after being put on the steel pipe, and the nut is tightened, the front outer side of the ferrule fits with the conical surface of the joint body, the head opening of the joint body abuts against the step surface of the ferrule, and the inner blade bites into the seamless steel pipe evenly to form an effective seal. It is easy to install and has high pressure resistance, so it is widely used.

[0003] When adjusting the tightness of the ferrule joint, the nut and the joint body are loosened, and the end opening of the joint body is separated from the step surface of the ferrule, resulting in a gap, which will cause oil to flow out from between the end opening of the joint body and the step surface of the ferrule, reducing the sealing performance. Summary of the invention

[0004] The object of the present invention is to provide a single-ferrule type pipe joint, which has the advantage of preventing a gap from being generated between the ferrule and the joint body when the tightness of the ferrule joint is adjusted.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A single ferrule type pipe joint comprises a nut, a joint body and a ferrule, wherein the inner diameter of the end of the ferrule in contact with the nut is larger than the end of the ferrule in contact with the joint body, both ends of the ferrule are provided with cutting edges inclined downward to form a cone, the insides of the nut and the joint body are provided with conical surfaces corresponding to the cutting edges of the ferrule, a step surface is formed between the end with the larger inner diameter and the end with the smaller inner diameter, the step surface is provided with a circle of grooves, and a sealing rubber ring is embedded in the groove.

[0006] By adopting the above technical scheme, the nut, the ferrule and the joint body are put on the steel pipe, and the ferrule is located between the nut and the joint body. The nut is turned so that the conical surface inside the nut presses against the end with a larger diameter of the ferrule, and the ferrule is driven to move so that the end with a smaller diameter of the ferrule presses against the conical surface inside the joint body, thereby generating a force. The force between the joint body and the ferrule causes the cutting edge of the end of the ferrule to cut into the outer wall of the steel pipe, and the end opening of the joint body generates a force on the sealing rubber ring on the step surface of the ferrule, compressing the sealing rubber ring to form a seal. When adjusting the tightness of the ferrule joint, loosening the nut and the joint body, the joint body is away from the ferrule, the pressure on the sealing rubber ring is reduced, and the sealing rubber ring rebounds and is always in contact with the end opening of the joint body to prevent the generation of a gap and increase the sealing performance.

[0007] Preferably, an inner blade is provided inside the end of the ferrule with a smaller diameter.

[0008] By adopting the above technical solution, the outer blade at the end of the ferrule and the inner blade inside the ferrule cut into the outer wall of the steel pipe, thereby improving the sealing performance.

[0009] Preferably, the ferrule is made of copper.

[0010] Adopting the above technical solution, the toughness is high and the corrosion resistance is strong.

[0011] Preferably, the nut and the connector body are made of stainless steel.

[0012] The above technical solution is adopted to improve its durability.

[0013] Preferably, a reinforcement ring is embedded in the depression at the end with a smaller inner diameter of the ferrule, and the reinforcement ring is fixedly connected to the ferrule.

[0014] By adopting the above technical solution, when the joint body and the nut squeeze the ferrule, the two sides of the recess will exert force on the reinforcing ring, thereby preventing the ferrule from deforming in the recess and affecting the cutting edge of the ferrule into the steel pipe.

[0015] Preferably, the reinforcement ring is broken at a certain position to form a gap.

[0016] By adopting the above technical solution, the reinforcement ring is deformed through the notch of the reinforcement ring so that it can be put on the ferrule and embedded in the groove.

[0017] In summary, the ferrule has strong durability, high practicality and strong sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of an embodiment; Figure 2 is a cross-sectional schematic diagram of an embodiment; Figure 3 It is a schematic diagram of the structure of the card sleeve.

[0019] Figure numerals: 1, nut; 2, joint body; 3, ferrule; 4, inner blade; 5, rubber ring; 6, reinforcement ring. DETAILED DESCRIPTION

[0020] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. At the same time, it should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0021] See also Figures 1 to 3A single ferrule pipe joint comprises a nut 1, a joint body 2 and a ferrule 3. The ferrule 3 is made of copper, which has high toughness and strong corrosion resistance. The nut 1 and the joint body 2 are made of stainless steel. The inner diameter of the end of the ferrule 3 in contact with the nut 1 is larger than the end of the ferrule 3 in contact with the joint body 2. Both ends of the ferrule 3 are provided with cutting edges inclined downward to form a cone, and a conical inner blade 4 is provided inside a section with a smaller inner diameter of the ferrule 3. The inside of the nut 1 and the joint body 2 is provided with a conical surface corresponding to the cutting edge of the ferrule 3, and the end with a larger inner diameter is connected to the end with a smaller inner diameter. A step surface is formed between one end and the other end, and an angle between the step surface and the smaller end of the ferrule 3 is 108 degrees. The end of the ferrule 3 with a smaller inner diameter is recessed inward near the step surface, and a reinforcing ring 6 is embedded in the recess. The reinforcing ring 6 is fixedly connected to the ferrule 3 to prevent the ferrule 3 from deforming in the recess when the joint body 2 and the nut 1 squeeze the ferrule 3, affecting the cutting edge of the ferrule 3 from cutting into the steel pipe. The reinforcing ring 6 is disconnected at a certain point to form a notch, which makes it easier to put the reinforcing ring 6 on the ferrule 3. A circle of grooves is provided on the step surface, and a sealing rubber ring 5 is embedded in the groove.

[0022] Working principle: put the nut 1, ferrule 3 and joint body 2 on the steel pipe, with the ferrule 3 located between the nut 1 and the joint body 2, and turn the nut 1 to make the conical surface inside the nut 1 against the end with a larger diameter of the ferrule 3, and drive the ferrule 3 to move, so that the end with a smaller diameter of the ferrule 3 against the conical surface inside the joint body 2, thereby generating a force. The force between the joint body 2 and the ferrule 3 makes the cutting edge at the end of the ferrule 3 and the inner blade 4 inside it cut into the outer wall of the steel pipe, and the end opening of the joint body 2 generates a force on the sealing rubber ring 5 on the step surface of the ferrule 3, compressing the sealing rubber ring 5 to form a seal. When adjusting the tightness of the ferrule 3 joint, loosen the nut 1 and the joint body 2, and the joint body 2 moves away from the ferrule 3, the pressure on the sealing rubber ring 5 is reduced, and the sealing rubber ring 5 rebounds and is always in contact with the end opening of the joint body 2 to prevent the generation of a gap and increase the sealing performance.

Claims

1. A single ferrule type pipe joint, comprising a nut (1), a joint body (2) and a ferrule (3), wherein the inner diameter of the end of the ferrule (3) in contact with the nut (1) is larger than the inner diameter of the end of the ferrule (3) in contact with the joint body (2), and both ends of the ferrule (3) are provided with cutting edges inclined downward to form a cone shape, and the insides of the nut (1) and the joint body (2) are provided with conical surfaces corresponding to the cutting edges of the ferrule (3), and a step surface is formed between the end with a larger inner diameter and the end with a smaller inner diameter, and the end with a smaller inner diameter of the ferrule (3) is concave inward near the step surface, wherein the ferrule (3) is characterized in that: The step surface is provided with a circle of grooves, and a sealing rubber ring (5) is embedded in the groove.

2. A single ferrule type pipe joint according to claim 1, characterized in that: An inner blade (4) is provided inside the end of the ferrule (3) with a smaller diameter.

3. A single ferrule type pipe joint according to claim 2, characterized in that: The ferrule (3) is made of copper.

4. A single ferrule type pipe joint according to claim 2, characterized in that: The nut (1) and the joint body (2) are made of stainless steel.

5. The single ferrule type pipe joint according to claim 1, characterized in that: A reinforcing ring (6) is embedded in the recessed portion of the end of the ferrule (3) with a smaller inner diameter, and the reinforcing ring (6) is fixedly connected to the ferrule (3).

6. The single ferrule type pipe joint according to claim 1, characterized in that: The reinforcing ring (6) is broken at a certain position, forming a gap.

Images