JPH0643468U - Fluid fittings - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The purpose of the fluid pipe joint is to make it easy to find defective pipe insertion. [Structure] An insulator 6 is provided on a portion of an inner peripheral surface of the tube-inserting tubular portion 2 that comes into contact with a tube that is inserted in an inclined state with respect to the tube-inserting tubular portion. , A pile of short fibers formed by electrostatic flocking is used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluid pipe joint, and more particularly, to a fluid pipe joint made of, for example, a metal, which includes a tubular portion for flow passage and a tubular portion for pipe insertion formed with a diameter larger than this diameter.

Generally, such a fluid pipe joint is used when a pipe is inserted into the tubular portion for inserting the pipe and the pipe and the tubular portion for the flow path are jointed. Therefore, this joint is fixed. There is a need to be able to easily check whether or not it has been carried out in a certain manner, and the present invention responds to this request.

[0003]

[Prior art]

 FIG. 3 is a cross-sectional view of a conventional fluid pipe joint in which a pipe is correctly inserted. 11 is a fluid pipe joint, 12 is a pipe insertion tubular portion, 13 is a connecting portion, 14 is a flow passage tubular portion, 15 is a packing and 17 is a pipe.

Here, the diameter of the tubular portion 12 for tube insertion is larger than that of the tubular portion 14 for flow passage as shown in the drawing, and a connecting portion 13 is formed between them. The packing 15 is for sealing the inner peripheral surface near the opening of the tubular portion 12 for tube insertion and the outer peripheral surface of the tube 17.

Then, as shown in the figure, when the pipe 17 is correctly inserted in the pipe inserting tubular portion 12, the end of the pipe 17 is in contact with the connecting portion 13, and the pipe 17 and the flow passage tubular member 12 are in contact with each other. A smooth flow is secured between the ribs 14 and.

On the other hand, when the pipe 17 is inserted obliquely into the pipe insertion tubular portion 12 (see FIG. 2), or when the pipe 17 is not oblique but is not inserted deep into the connection portion, the pipes 17 are not connected to each other. The smooth flow of water will not be secured, and it will cause leakage.

Therefore, after inserting the tube 17 into the tube inserting tubular portion 12, it is necessary to confirm whether or not they are jointed in the correct positional relationship as shown in the figure. As a method for this, a method is used in which the inclination of the pipe 17 with respect to the tubular portion 12 for pipe insertion, the length of the portion of the pipe 17 protruding outside the tubular portion 12 for pipe insertion, and the like are determined by visual inspection or measurement. Was there.

[0008]

[Problems to be solved by the device]

 As described above, the conventional confirmation method cannot easily obtain a highly accurate confirmation result. In other words, there is a problem that the accuracy of the confirmation result cannot be expected in the case of visual inspection, which is a simple method, and the work is troublesome in the case of tilt measurement in which high accuracy can be expected. This becomes more remarkable as the allowable range of the misalignment between the fluid pipe joint and the pipe becomes narrower.

Therefore, in the present invention, an insulator is provided at a predetermined portion of the inner peripheral surface of the tubular portion for inserting the pipe, and it is confirmed whether the pipe is correctly inserted or not by checking the electrical connection between the pipe and the fluid pipe joint. The purpose is to make it easy to detect a defective insertion of the pipe by enabling or disabling the electrical continuity.

[0010]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is designed such that at least the surface portion is displaced from the inner peripheral surface of the tubular portion for pipe insertion, which constitutes the fluid pipe joint made of metal, with respect to the tubular portion for pipe insertion. An insulator is provided at the portion where the inserted tube comes into contact, and a pile of short fibers formed by electrostatic flocking is used as the insulator.

[0011]

[Action]

 As described above, in the fluid pipe joint of the present invention, when the pipe is not inserted properly and the pipe and the tubular portion for inserting the pipe are deviated from the original state (see FIG. 2), the end portion of the pipe comes first. End of the pipe does not come into contact with the previous insulator if the pipe is inserted properly and there is no deviation between the pipe and the tubular part for inserting the pipe that exceeds the allowable range. It is like this.

Therefore, when the pipe is not properly inserted, the pipe and the fluid pipe joint are in an electrically non-conductive state, and when the pipe is well inserted, the pipe and the fluid pipe joint are in a conductive state. Become.

[0013]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a fluid pipe joint of the present invention in which a pipe is correctly inserted. 1 is a metal fluid pipe joint, 2 is a pipe inserting tubular portion, 3 is a connecting portion, 4 is a flow passage The tubular portion, 5 is a packing, 6 is an insulator, and 7 is a tube.

Here, what is different from the conventional fluid pipe joint shown in FIG. 3 is that an insulator 6 is provided, and the packing 5 is an insulator, and the constituent elements are the fluid of FIG. The pipe joint 11, the pipe insertion tubular portion 12, the connecting portion 13, the flow passage tubular portion 14, and the pipe 17 are substantially the same.

As the insulator 6, an extremely thin (wall thickness 0.2 to 0.3 mm) sleeve made of rubber or plastic is attached to the inner peripheral surface of the tubular portion 2 for tube insertion. A short fiber pile such as nylon or rayon formed on the inner peripheral surface of the tubular portion 2 for tube insertion by electrostatic flocking is used.

Comparing both of these, points of labor and cost for forming the tube 7 due to variations in the outer diameter of the tube 7 and the inner diameter of the tubular portion 2 for tube insertion The latter is more practical because it can be absorbed by elasticity.

Further, it is only an example that the insulator 6 is provided on the entire inner peripheral surface of the tubular portion for pipe insertion as shown in the figure, and when the precision of the actual joint work of the pipe is high, or when the fluid pipe joint is used. In view of the structure of the above, it is needless to say that the insulator 6 may not be provided at a portion where the pipe is not likely to contact even if the joint is displaced, for example, a portion closer to the opening than the packing 5. Is.

There are various types of fluid pipe joints, for example, those having a tubular portion for pipe insertion at one end of the pipe (tubular portion for flow passage), or both sides of the tubular portion for flow passage. The present invention can be applied to any fluid pipe joint, although there are pipes having a tubular portion for pipe insertion and deformed pipes such as bends, elbows, Ts, and crosses.

Further, in addition to the metal fluid pipe joint, the present invention is also applied to a fluid pipe joint in which a surface of reinforced plastic or the like is coated with a conductive film.

FIG. 2 is an explanatory diagram showing how the tester 8 detects a defective insertion state of the pipe. This improper insertion state (the state in which the pipe 7 is displaced with respect to the tubular portion 2 for pipe insertion) is as follows: When the pipe 7 is inserted obliquely with respect to the tubular portion 2 for pipe insertion. This occurs when the connection part 3 is not inserted deeply (although it is not).

At this time, even if one of the measurement terminals of the tester 8 is applied to the outer peripheral surface of the pipe 7 and the other is applied to the outer peripheral surface of the fluid pipe joint 1, conduction between the two is not detected.

Then, as shown in FIG. 1, when the space between the properly inserted outer peripheral surface of the pipe 7 and the outer peripheral surface of the fluid pipe joint 1 is examined by a tester 8, it is found that conduction between them is not detected. Of course.

[0023]

[Effect of device]

 According to the present invention, it is possible to reliably detect a defective insertion of the pipe into the tubular portion for inserting the pipe by a simple operation such as checking whether or not there is electrical continuity between the pipe and the fluid pipe joint.

Further, by using a pile of short fibers formed by electrostatic flocking as the insulator provided on the inner peripheral surface of the tubular portion for tube insertion, the manufacturing cost is reduced and the insulator is formed. Due to this, the elasticity that the diameter of the tubular portion for inserting the pipe is shortened and it becomes difficult to insert the pipe can be solved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a pipe is correctly inserted in a fluid pipe joint of the present invention.

FIG. 2 is an explanatory diagram showing how a defective insertion state of a pipe is detected using a tester 8. In this figure, the tube 7 is inserted obliquely into the tube insertion tube 2.

FIG. 3 is a cross-sectional view of a conventional fluid pipe joint in which a pipe is correctly inserted.

[Explanation of symbols]

 1,11 ・ ・ ・ Fluid fitting 2,12 ・ ・ ・ Pipe insertion tubular part 3,13 ・ ・ ・ Connection part 4,14 ・ ・ ・ Flow path tubular part 5,15 ・ ・ ・ Packing 6 ・..Insulators 7,17 ... Tubes 8 ... Testers

Claims (2)

[Scope of utility model registration request] 1. A liquid pipe joint provided with a tubular portion for flow passage and a tubular portion for pipe insertion formed with a diameter longer than this diameter, wherein an inner peripheral surface of the tubular portion for pipe insertion is provided. A liquid pipe joint characterized in that an insulator is provided at a portion where a pipe inserted in a state displaced from the tubular portion for pipe insertion comes into contact. 2. The fluid pipe joint according to claim 1, wherein a pile of short fibers formed by electrostatic flocking is used as the insulator.