CN213982411U - Insulating joint - Google Patents

Abstract

The utility model relates to an insulating joint, including body, takeover, first protective sheath, second protective sheath, retaining ring, sealing member, driving piece. The utility model discloses a set up the retaining ring between first protective sheath and second protective sheath, set up the sealing member between takeover and body to form L shape insulating seal on the most advanced and the biggest excircle surface of takeover, greatly improved insulating joint resistance, withstand voltage intensity and reliability, satisfy and exceed (SY/T0516-.

Description

Insulating joint

Technical Field

The utility model relates to a mechanical connection field, concretely relates to insulating joint that instrument system used.

Background

In the transportation of gas and oil, the insulated joint for instrument tube is used as an important element of long pipeline transportation pipe system, and in order to avoid the danger of electrochemical corrosion to the pipeline, the cathode protection effect is often used to reduce the corrosion of metal equipment. However, in order to monitor the operating state of the pipeline, various monitoring instruments, transmitters, valves, pipe connectors and other components are installed at various stages of the pipeline system. The monitoring instrument, the electric control valve and the transmitter all belong to electronic components and need to be electrified to work. In the operation process of the system pipeline, various electronic components may have the risk of electric leakage. Therefore, the cathode protection of the pipe is easily adversely affected. Some electronic meters require grounding, which allows the pipe to be grounded (conducted to ground) through a pressure pipe connecting the pipe directly to the meter. The direct result is that the current used for cathodic protection of the pipeline is dissipated, which affects the cathodic protection effect.

Insulating joints in instrument system pipelines need to have good sealing and strength requirements, and also have good insulating property requirements. If the insulation resistance and the breakdown voltage do not meet the requirements, the cathode protection effect cannot be achieved, the pipeline can be seriously corroded, the service life of the pipeline is shortened, or potential safety hazards are formed on the pipeline of an instrument system.

For this reason, the insulation resistance value specified by the SY/T0516-. The insulating joint of the instrument pipeline in the current market is difficult to meet new requirements and has poor reliability.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides an insulating joint, including body, driving piece, first protective sheath, second protective sheath, takeover, retaining ring, sealing member. The body is provided with a cylindrical hole at the end part, the cylindrical hole is outwards adjacent to the radially enlarged conical opening, and inwards ends at the shaft shoulder; the driving piece is in threaded connection with the body, and a driving surface is arranged in the driving piece; the first protective sleeve has a first front end portion entering the tapered mouth of the body and a first tapered rear end portion mating with the tapered mouth of the body; the second protective sleeve is provided with a second front end part entering the driving part and a second conical rear end part combined with the driving surface of the driving part; the connecting pipe is provided with a connecting support part and a sealed rear end part, the connecting support part is provided with a front inclined surface combined with the second conical rear end part of the second protective sleeve and a rear inclined surface combined with the first conical rear end part of the first protective sleeve, the front inclined surface is adjacent to a front supporting surface, the rear inclined surface is adjacent to a rear supporting surface, the front supporting surface is matched with the second front end part of the second protective sleeve, and the rear supporting surface is matched with the first front end part of the first protective sleeve; the retainer ring is provided with a first sealing end and a second sealing end, the first sealing end and the first protective sleeve form sealing, and the second sealing end and the second protective sleeve form sealing; the sealing element is provided with a rear end part abutting against the shaft shoulder of the body, and the front end of the sealing element is provided with an upper sealing surface combined with the first front end part of the first protective sleeve and a lower sealing surface combined with the sealed rear end part of the connecting pipe; when the driving piece is screwed with the body, the driving piece drives the second protective sleeve to tightly press the connecting pipe, and the connecting pipe is forced to push the first protective sleeve to enter the conical opening of the body.

Preferably, the first tapered rear end portion of the first protective sheath is constricted at its distal end by a first small step straight tube portion, the second tapered rear end portion of the second protective sheath is constricted at its distal end by a second small step straight tube portion, and the retainer ring has a first shoulder portion fitted to the first small step straight tube portion of the first protective sheath, and a second shoulder portion fitted to the second small step straight tube portion of the second protective sheath.

Preferably, the driving surface is a conical surface.

The utility model has the advantages of stable performance, insulation resistance value of 40M omega, voltage resistance of 5KV, and capability of meeting and exceeding the requirements of SY/T0516-; simultaneously the utility model discloses simple structure, low in manufacturing cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the utility model;

FIG. 3 is a schematic structural view of the adapter tube of the present invention;

fig. 4 is a schematic structural view of the driving member of the present invention;

fig. 5 is a schematic structural view of the first protective sheath of the present invention;

FIG. 6 is a schematic view of a second protective sheath according to the present invention;

FIG. 7 is a schematic structural view of the retainer ring of the present invention;

fig. 8 is a schematic structural view of the sealing gasket of the present invention;

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1 to 8, the present invention includes a body 100, a connection pipe 200, a first protection sleeve 300, a second protection sleeve 400, a retainer ring 500, a sealing member 600, and a driving member 700. The body 100 comprises a connecting end 101 and an output end 102, the connecting end 101 being provided with an external thread and the end thereof being provided with a cylindrical bore 104, the cylindrical bore 104 outwardly adjoining the radially enlarged conical mouth 103 and inwardly adjoining the central bore 105, the cylindrical bore 104 and the central bore 105 forming a shoulder 106 at the junction thereof.

The first protective sheath 300 is generally funnel-shaped with a first front end 301 entering the tapered mouth 103 of the end of the body 100 and a first tapered rear end 302. The first front end 301 has an outer circumference matching the outer diameter of the cylindrical bore 104 of the body 100 and the first tapered rear end 302 has a taper corresponding to the tapered mouth 103 of the body 100. when the first protective sheath 300 is inserted into the body 100, the first front end 301 contacts the cylindrical bore 104 and the first tapered rear end 302 contacts the tapered mouth 103.

The second protective sheath 400 has a shape conforming to the first protective sheath 300 and includes a second front end portion 401 and a second tapered rear end portion 402, and the second protective sheath 400 is disposed on the connection supporting end 216 of the adapter 200 symmetrically to the first protective sheath 300. The first protective sheath 300 and the second protective sheath 400 may be manufactured using a polyamide-imide process.

The adapter 200 comprises an input end 201, a connection support end 216 and a sealed rear end 210, the connection support 216 having a front bevel 203 in combination with a second tapered rear end portion 402 of the second protective sheath and a rear bevel 207 in combination with a first tapered rear end portion 302 of the first protective sheath, the front bevel 203 and the rear bevel 207 defining a maximum outer circular surface 205. The front bevel 203 has substantially the same taper as the second tapered back end 402 of the second protective sheath and the back bevel 207 has substantially the same taper as the first tapered back end 302 of the first protective sheath. Front bevel 203 and rear bevel 207 may better engage first protective sleeve 300 and second protective sleeve 400 to provide axial guidance and axial support for the joint during installation and use. Further, the front bevel 203 abuts the front support face 202, and the rear bevel 207 abuts the rear support face 208. The front bearing surface 202 engages the second front end 401 of the second sock and the rear bearing surface 208 engages the first front end 301 of the first sock. The front bearing surface 202 and the rear bearing surface 208 provide radial support for the joint when subjected to radial forces.

The driving member 700 comprises an externally disposed hexagonal portion 701 and an internally disposed connecting portion 704, the connecting portion 704 being provided with a thread for engaging with the body coupling segment 101, the connecting portion 704 being adjacent a driving surface 703.

The retainer ring 500 is disposed between the first protective sheath 300 and the second protective sheath 400 and includes a first sealing end 501 and a second sealing end 502, the first sealing end 501 forming a seal with the first protective sheath 300 and the second sealing end 502 forming a seal with the second protective sheath 400.

The seal 600 is disposed in the cylindrical bore 104 of the body 100 with its rear end 602 abutting against the shoulder 106 and its front end in contact with and forming a seal with the first boot 300 and the nozzle 200. The retainer ring 500 and seal 600 may be made of polytetrafluoroethylene.

When the driver 700 is tightened with the body 100, the driving surface 703 of the driver 700 contacts the second tapered rear end 402 of the second protective sheath 400, pressing the second tapered rear end 402 axially against the protuberance on the connection support end 216 of the adapter 100. To reduce the installation torque and avoid wear between the driver 700 and the second protective sheath 400, the driving surface 703 is preferably a tapered surface. The taper of which is substantially the same as the taper of the second tapered rear end 402 of the second protective sheath 400. The second protection sleeve 400 drives the adapter tube 100 to move axially, forcing the adapter tube 200 to push the first protection sleeve 300 into the tapered mouth 103 of the body 100. Tapered mouth 103 contacts first tapered rear end 302 of first protector 300 and applies an opposing force to first tapered rear end 302, causing first tapered rear end 302 of first protector 300 to abut against the ridge on connecting support end 216 of nozzle 100. When the driving member 700 is fully screwed down with the body 100, the first sealing end 501 of the retainer ring 500 forms a seal with the first protective sheath 300, and the second sealing end 502 forms a seal with the second protective sheath 400. The front end of the sealing member 600 contacts and forms a seal with the first protection cap 300 and the adapter tube 200, respectively.

In another preferred embodiment of the present invention, the end of the first tapered rear end portion 302 of the first protective sheath abuts the first small step straight tube portion 303, and the end of the second tapered rear end portion 402 of the second protective sheath abuts the second small step straight tube portion 403; the retainer ring 500 has a first shoulder 503 which engages with the first small step straight tube portion 303 of the first protective sheath, and a second shoulder 504 which engages with the second small step straight tube portion 403 of the second protective sheath. The retainer ring 500 forms two L-shaped contact surfaces with the first small step straight tube portion 303 of the first protective sleeve and the second small step straight tube portion 403 of the second protective sleeve. In another preferred embodiment of the present invention, the front end of the sealing member 600 is provided with an upper sealing surface 604 and a lower sealing surface 602. The upper sealing surface 604 engages the first forward end 301 of the first boot to form an L-shaped contact surface, and the lower sealing surface 602 engages the sealed rearward end 210 of the nozzle to form an L-shaped contact surface.

According to the principle of charge concentration at the surface of the conductor and the surface tip for charge distribution in electrostatic equilibrium, charge concentration is highly likely to occur at the surface tip A, B, C, D and the maximum outer circumferential surface 205, causing breakdown or discharge and failure of the insulated joint. After the retainer ring 500 is assembled and combined with the first protective sheath 300 and the second protective sheath 400, and after the sealing member 600 is combined with the adapter 200. The tip A, B, C, D and the maximum outer circular surface 205 are directly wrapped to form a good isolation and insulation effect, so that the problem of insulation joint failure caused by breakdown or discharge due to charge concentration is well solved. The resistance, the voltage resistance strength and the reliability of the insulated joint are greatly improved.

The invention has been described with reference to the preferred embodiments, to the above examples which are not intended to limit the invention, and from reading the present description, those skilled in the art will be able to conceive of numerous modifications and variations to this structure, without departing from the inventive concept, any obvious alternative falling within the scope of the invention.

Claims (3)

1. An insulated joint, comprising:

a body having a cylindrical bore at an end thereof, the cylindrical bore being outwardly adjacent the radially enlarged conical mouth, inwardly and terminating in a shoulder;

the driving piece is in threaded connection with the body, and a driving surface is arranged in the driving piece;

a first protective sheath having a first front end portion entering the body at the tapered mouth and a first tapered rear end portion mating with the body at the tapered mouth;

a second protective sheath having a second front end entering the driver and a second tapered rear end engaging the drive surface of the driver;

a connection tube having a connection support portion and a sealed rear end portion, said connection support portion having a front bevel engaging said second tapered rear end portion of the second protective sheath and a rear bevel engaging said first tapered rear end portion of the first protective sheath, the front bevel abutting the front bearing surface, the rear bevel abutting the rear bearing surface, said front bearing surface cooperating with said second front end portion of the second protective sheath, said rear bearing surface cooperating with said first front end portion of the first protective sheath;

the check ring is provided with a first sealing end and a second sealing end, the first sealing end forms sealing with the first protective sleeve, and the second sealing end forms sealing with the second protective sleeve;

a seal member having a rear end portion abutting against said shoulder of the body, the front end of the seal member being provided with an upper seal surface engaging said first front end portion of the first boot and a lower seal surface engaging said sealed rear end portion of the nozzle;

when the driving piece is screwed with the body, the driving piece drives the second protective sleeve to tightly press the connecting pipe, and the connecting pipe is forced to push the first protective sleeve to enter the conical opening of the body.

2. An insulated joint according to claim 1, wherein the first tapered rear end portion of the first protective sheath is necked down at its distal end by a first small step straight tube portion, and the second tapered rear end portion of the second protective sheath is necked down at its distal end by a second small step straight tube portion; the retainer ring is provided with a first shoulder matched with the first small step straight pipe part of the first protective sleeve and a second shoulder matched with the second small step straight pipe part of the second protective sleeve.

3. An insulated joint according to claim 2, wherein the driving surfaces are tapered surfaces.

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