JPH0542882U - Structure of connector for connecting metal spiral tubes - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a high pressure is generated inside the pipe, the pipe is not liable to be pushed out, and even if the substance inside the pipe freezes, it can be electrically thawed by a metal spiral. Providing a structure for a connector for connecting pipes. [Structure] Between the socket 1 for connecting the spiral tube 5 and the tightening nut 2, a packing 3 having a spiral wire to be screwed onto the outer peripheral portion of the spiral tube 5 is fitted so that a sealing force is applied. Inner surface 1 of the socket 1
a and the outer surface 3a of the packing 3 fitted to the inner surface are formed into a tapered surface, and a metal ring 4 having a 1-lead type spiral wire 4a formed on the back side of the packing 3 is screwed into the spiral tube 5. And the contact portion 3 between the packing 3 and the metal ring 4
A taper surface is formed on each of e and 4b so that the pressing force of the packing 3 acts in the axial center direction of the spiral tube 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a connecting connector used for hermetically connecting metallic spiral tubes, and particularly when the hermeticity can be maintained even under a high pressure condition and when the material inside the tubular body is frozen in winter. The present invention relates to a structure of a connecting tool for connecting a metal spiral tube that enables an electric deicing operation.

[0002]

[Prior Art]

 As a connecting member used for connecting the spiral pipe, a structure in which an elastic packing is interposed between a tightening nut and a socket is mainly used as a sealing member. For example, as disclosed in Japanese Unexamined Patent Publication No. 49-32215, an inclined surface is provided at both ends and a spiral wire having the same shape as the spiral wire of the spiral tube is formed on the inner surface contacting the spiral tube. There is a connector having a structure that is fastened by pressure, and most of the connectors have a structure in which a ring-shaped packing is interposed between the tightening nut and the socket. However, in the connecting device having the above-mentioned conventional structure (Japanese Patent Laid-Open No. 49-32215), when the tightening nut and the socket are screw-connected, the rotating nut pressure is applied to the packing made of an elastic material to cause twisting deformation. As a result, the sealing force is weakened, and since the position of the spiral tube supported by the connection is supported by the packing made of an elastic material, it is possible to prevent high pressure inside the tube. However, it was unsuitable for high-pressure pipeline equipment.

Further, even in the structure in which the ring-shaped packing is interposed between the tightening nut and the socket as described above, a twisting deformation occurs because the rotating pressure is applied to the packing when tightening the tightening nut. However, there was a problem that the spiral tube was pushed out when the sealing force was weakened and pressure was generated in the tube. On the other hand, the present applicant has filed a public application as Japanese Patent Application No. 62-136732 in which the above-mentioned twisting deformation of the packing is minimized to enhance the sealing force. In this structure, a circular ring is formed as a packing member, and at the same time, another lubrication ring is provided on the tightening nut side, and the rotational force is blocked (absorbed) by the lubricous ring itself when the tightening nut is pressure-fastened. By horizontally pressing the circular ring (packing member) on the front side of the packing member, the packing member is prevented from being twisted and deformed, and at the same time, the packing member is fitted between the grooves of the spiral tube to closely protect and protect the spiral tube. Is to maintain.

[0004]

[Problems to be solved by the device]

 However, each of the above-mentioned structures has the following problems. First, in both structures, since the position of the spiral tube is protected and maintained only by the packing made of rubber or synthetic resin, when a high pressure is generated in the tube, the tube is weakly supported and the tube is not supported. There is a defect that the body separates from the connection port (the pipe body is pushed backward), and secondly, since the packing is made of non-conductive rubber, synthetic resin or asbestos, the spiral pipe and the connecting member (socket). Alternatively, there is a problem in that electrical insulation is provided during the tightening nut, and when the substance inside the pipe freezes in the winter, the thaw becomes impossible when performing the thaw operation by electricity.

The object of the present invention is to solve the above-mentioned conventional problems, there is no danger of the pipe body being pushed out even when a high pressure is generated inside the pipe body, and the substance inside the pipe body freezes in winter. It is an object of the present invention to provide a structure of a connector for connecting a metal spiral tube, which enables the deicing work by electricity even in the case of doing so.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the metal spiral tube connecting connector according to the present invention has an outer surface of a packing made of rubber or synthetic resin interposed between the tightening nut and the socket on the taper surface. A taper surface is also formed on the inner surface of the socket into which the packing is fitted so as to correspond to the outer surface of the packing, and the inner surface of the packing, that is, the contact surface with the spiral tube has the same spiral shape as the spiral wire of the spiral tube. When the tightening nut is tightened, the packing is deformed in the direction of the center of the circle by the tightening pressure and press-fits to the spiral tube side to improve the sealing performance, and the back side of the packing has one lead on its inner surface. By arranging the metal ring with a spiral shape on the spiral pipe, the metal ring acts as a stopper that prevents the pipe from being pushed out even if pressure is generated inside the pipe. To prevent detachment (extrusion) of the spiral tube, and to form a contact surface between this metal ring and the packing in a tapered surface so that when the packing is tightened, The structure is designed to be able to be pressed to improve the sealing force, and the metal ring is made of a conductive material so that it can be energized, and electricity is used to freeze the material inside the spiral tube in winter. It was designed to be able to thaw the ice.

[0007]

[Action]

 A tightening nut is loosely fitted to the wire end of the spiral tube, a metal ring is screwed to the spiral tube to a predetermined position, and then a packing is screwed to the spiral tube to connect the spiral tube tip and the packing tip. To make it flush. If the tip of the spiral tube is inserted into the socket in this state and tightened with the tightening nut, the packing is deformed by the tightening force due to the tapered surface on the inner surface of the socket and the tapered surface on the outer surface of the packing, and the outer surface adheres to the inner surface of the socket. At the same time, the inner surface can be tightly sealed to the outer surface of the spiral tube. At this time, the rear end surface of the packing is strongly pressed against the front end surface of the metal ring, and moreover, since the contact surface of both is formed, the rear end portion of the packing acts so as to be pressed in the axial center direction of the spiral tube. However, the hermeticity is further enhanced. Since the one-lead type spiral wire is formed on the metal ring and is screwed into the spiral tube, the packing and the metal ring are not pushed backward even when the pressure inside the spiral tube is high. Since the metal ring is made of a conductive material, electricity can be applied to the spiral tube through the tightening nut, and even if the material inside the spiral tube freezes in the winter, it has been well-known that the defrosting method uses electricity. It becomes possible to work.

[0008]

【Example】

 The structure of the connecting device for connecting the metal spiral tube according to the present invention will be described with reference to FIGS. In the figure, reference numeral 1 is a socket, which is screwed to a corresponding tightening nut 2. The inner surface 1a of the spiral tube connection port 1c of the socket 1 is formed into a taper surface that becomes smaller in diameter as it goes deeper, and the rear end surface 1b is also formed into a more steep taper surface. Between the socket 1 and the tightening nut 2, a packing 3 and a metal ring 4 which are screwed onto the outer periphery of the spiral tube 5 are arranged, and when the tightening nut 2 is tightened, the packing 3 and the metal ring 4 are pressed. The sealing force will be generated.

The packing 3 is formed of rubber or synthetic resin having elasticity, and the outer surface 3a thereof is formed into a tapered surface corresponding to the tapered surface of the inner surface 1a of the socket 1, and the inner surface 3b of the packing 3 is That is, the contact portion with the spiral tube 5 is formed with a spiral wire having the same shape as the spiral wire 5a of the spiral tube 5. The front side surface 3d of the flange portion 3c formed at the rear end portion of the packing 3 is formed so as to correspond to the taper surface of the tip portion 1b of the socket, and the rear end surface of the flange portion 3c is formed. 3e is also formed on the tapered surface corresponding to the tapered surface formed on the tip surface 4b of the metal ring 4 described later.

The metal ring 4 is formed of a conductive metal material, and a one-lead type spiral wire 4 a is formed on the inner surface in contact with the spiral tube 5 and screwed with the spiral wire 5 a of the spiral tube 5. The front end surface 4b is formed into a taper surface corresponding to the taper surface formed on the rear end surface 3e of the flange portion 3c. Therefore, as the socket 1 and the tightening nut 2 are tightened, the metal ring 4 presses the packing 3 toward the axial center of the spiral tube 5 to increase the sealing force.

Next, a process of connecting pipes using each member configured as described above will be described with reference to FIG. First, the spiral tube 5 is fitted in the tube insertion opening 2a formed in the tightening nut 2, and the metal ring 4 and the packing 3 are fitted in order on the outer surface of the spiral tube 5. At this time, the metal ring 4 and the packing 4 are screwed and fitted, but the tip 3f of the packing 3 and the tip 5b of the spiral tube 5 are fitted so as to be substantially flush with each other, and the metal ring 4 is fitted into the packing 3 The flange 3c is fitted and coupled so as to be connected to the rear end surface 3e. After that, when the tightening nut 2 is screwed to the socket 1, the screw tube 5, the packing 3 and the metal ring 4 move to the socket 1 side as shown in FIG. 3, and the socket 1 side as shown in FIG. It is tightly fixed to and is given a sealing force.

When the respective members are pressed and brought into close contact with each other as described above, the packing 3 is deformed by the pressing force and the outer surface 3 a of the packing 3 comes into close contact with the inner surface 1 a of the socket 1 which is a tapered surface. At the same time, the inner surface 3b is in close contact with the outer peripheral surface of the spiral tube 5 to improve the sealing force, and the flange portion 3c of the packing 3 has the front side surface 3d in close contact with the rear end surface 1b of the socket 1 and the rear end surface 3e of metal. The sealing force is improved by closely contacting the tip surface 4b of the ring 4. At this time, since the rear end surface 3e of the packing 3 and the front end surface 4b of the metal ring 4 are formed on the respective taper surfaces, the pressing force of the metal ring 4 presses the packing 3 toward the axial center of the spiral tube 5. The sealing force between the packing 3 and the spiral tube 5 is further improved.

[0013]

[Effect of the device]

 The structure of the connector for connecting the metal spiral pipe according to the present invention has the following effects. First, since the inner surface of the socket and the outer surface of the packing fitted to the inner surface are tapered surfaces and are closely adhered to each other, the adhesion is maximized and the sealing force can be improved. The spiral wire of the spiral tube and the spiral wire screwed on the inner surface of the packing are mutually screwed to fix the position, and the 1-lead type spiral wire formed on the metal ring at the rear part is the spiral wire of the spiral tube. It is screwed to support the rear end of the packing and at the same time fixes the position of the spiral tube, that is, the metal ring acts as a stopper for the spiral tube, so that it is higher inside the tube as in the past. Not only does the spiral tube not be pushed backwards even if pressure is generated, but the contacting part between the packing and the metal ring is composed of a tapered surface, and the pressing force of the packing presses the spiral tube in the axial center direction. Because it acts like It can be increased to. Secondly, a metal ring made of a conductive material is placed between the metal spiral tube and the tightening nut to enable energization, so even if the substance inside the tube freezes in winter. Defrosting work using electricity is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a connecting tool for connecting a metal spiral tube according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a metal ring and a packing are fitted to the distal end portion of the spiral tube inserted into the tightening nut.

FIG. 3 is a cross-sectional view showing an intermediate state of a connecting process.

FIG. 4 is a sectional view showing a completed state of connection.

FIG. 5 is an enlarged perspective view of a metal ring.

[Explanation of symbols]

 1 is a socket 1a is an inner surface of the socket 2 is a tightening nut 3 is a packing 3a is an outer surface of the packing 3b is an inner surface of the packing 4 is a metal ring 4a is a 1-lead type spiral wire 5 is a spiral tube

Claims (2)

[Scope of utility model registration request] 1. A packing (3) having a spiral thread formed between the socket (1) and the tightening nut (2) for connecting the spiral tube (5) to the outer peripheral portion of the spiral tube (5). ) Is fitted to provide a sealing force, the inner surface (1a) of the socket (1) and the outer surface (3a) of the packing (3) fitted to the inner surface are tapered surfaces. The metal ring (4), which is formed so as to be joined to each other and has a one-lead type spiral wire (4a) formed on the back side of the packing (3), is screwed into the spiral tube (5). By arranging them in such a manner that they serve as stoppers for preventing the packing (3) and the spiral tube (5) from being pushed out backward when a high pressure is generated in the tube body, the packing (3) and the metal are A tapered surface is formed on the contact portion (3e, 4b) of the ring (4). Structure of the connection coupling of the metal spiral tube, characterized by being configured to act on the axial center direction of the pressing force spiral tube (5) of Patsukingu (3). 2. Metal according to claim 1, characterized in that the metal ring (4) is made of an electrically conductive material so that the spiral tube (5) and the fastening nut (2) can be brought into conduction. The structure of the connector for connecting the spiral tube.