JPH0237029Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is suitable for connection when a large number of pipes are connected to a joint body, for example, when a large number of pipes are connected to a rotary joint in a hydraulic system. It is related to the structure.

(b) Conventional technology Conventionally, when connecting a large number of pipes to a joint body, as shown in Fig. 6, the tip of the pipe to be connected is inserted into each joint hole of the joint body, and then Each wire was welded or brazed to the main body.

(c) Problems to be solved by the invention In the conventional structure described above, it is impossible to perform welding if the distance between the tubes is narrowed, so the center diameter of the tube row inevitably increases, resulting in a large size, and it is necessary to reduce the weight. In addition, it is difficult to weld thin-walled pipes, and there are drawbacks such as pinholes forming in the welded area, and cracks in the pipe near the welded area after long-term use. Since oxidized scale forms on the parts, it takes time and effort to remove it.

(d) Means for solving the problem In order to improve the above-mentioned drawbacks, the present invention has a joint hole arranged equally on a concentric circle and a joint hole located outside the joint hole and arranged on a concentric circle with the joint hole. a joint body having a female screw arranged in a section; a presser plate facing the joint body and having a pipe passage hole and a bolt hole at opposite positions of the joint hole and the female screw; inserted into the pipe 8; It consists of a sleeve interposed between the joint body and the retainer, and a tightening bolt that is screwed into the female thread.A pipe insertion hole is bored at the entrance of the joint hole, a step is provided at the bottom, and the pipe insertion hole and pipe passage hole are provided. The sleeve abutting surface is formed into a conical surface.

(E) Action When the tightening bolt is tightened, the joint holes and bolt holes are arranged equally on concentric circles, so each joint is pressed evenly, and the sleeve is pressed against the conical surface of the pipe insertion hole in the joint body. It is compressed by the conical surface of the tube passage hole of the sleeve and bites into the outer circumferential surface of the tube.Leakage from the outer surface of the sleeve is due to the pinching pressure of the conical surface, and leakage from the inner surface is bitten into the outer circumferential surface of the tube. It is completely prevented by pressure welding. In this case, the pipe comes into contact with the step of the joint body, and together with the biting pressure welding, the pipe is firmly held and will not come off.

(F) Example An example of the present invention will be explained with reference to the drawings.
In Fig. 1, reference numeral 1 denotes a joint body, in which seven joint holes 2 for connecting pipes are equally spaced on a concentric circle, and female screws 3 are equally spaced on the outside of the joint body 2 on a concentric circle with the aforementioned circle. It has 7 screws. Reference numeral 4 denotes a presser plate, which has a pipe passage hole 5 and a bolt hole 6 formed at positions opposite to the joint hole 2 and the female screw 3, respectively.
The side of the joint body 1 is chamfered to form a conical surface 7, and a pipe insertion hole 9 into which the outer diameter of the pipe 8 is inserted is bored at the entrance of the joint hole 2, and at the bottom thereof,
While forming a step 10 with the joint hole 2,
The entrance portion of the tube insertion hole 9 is chamfered to form a conical surface 11. 12 is a sleeve fitted into the tube 8 so that its front and back abut against the conical surfaces 11 and 7;
13 is a tightening bolt.

In addition, Fig. 5 shows an example in which the present invention was applied to a rotary joint in a hydraulic system, and Fig. 6 shows an example in which the conventional welding technique was used. In this case, it is possible to reduce the weight by 25%. Ta.

(g) Effects of the invention As described above, according to the invention, it is possible to reduce the distance between the pipes, thereby reducing the size and weight, and eliminating the trouble of welding and removing oxide scale after welding. In addition, there is no fluid leakage due to pinholes, pipe cracks, etc., and thin-walled pipes can be used.Moreover, the connection direction of the pipe is regulated by the pipe insertion hole and the pipe passage hole, making it extremely accurate, and it is easy to disassemble. This has great practical effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a side sectional view of the main parts, Figure 2 is a side sectional view of Figure 1 with the tube, sleeve, and tightening bolts removed, and Figures 3 and 4 are the X-- X
5 is a partially cutaway side view of an embodiment implemented on a rotary joint of a hydraulic system, and FIG. 6 is a partially cutaway side view of a rotary joint of a hydraulic system according to the conventional technology. FIG. DESCRIPTION OF SYMBOLS 1...Joint body, 2...Joint hole, 3...Female screw, 4...Pressure metal, 5...Pipe passage hole, 6...Bolt hole, 7...Conical surface, 8...Pipe, 9... ...tube insertion hole,
10...Step, 11...Conical surface, 12...Sleeve, 13...Tightening bolt.

Claims (1)

[Scope of utility model registration request] A joint main body 1 having a joint hole 2 arranged equally on a concentric circle and a female screw 3 located outside the joint hole 2 and arranged equally on a concentric circle with the joint hole 2; A presser metal plate 4 is provided with a pipe passage hole 5 and a bolt hole 6 at opposite positions of the joint hole 2 and the female screw 3, respectively, and is inserted into the pipe 8 and interposed between the joint body 1 and the metal screw 4. It consists of a sleeve 12 and a tightening bolt 13 that is screwed into the female screw 3. A tube insertion hole 9 is bored at the entrance of the joint hole 2 and a step 10 is provided at the bottom. Sleeve 12
A pipe joint structure in which the contact surfaces are formed into conical surfaces 11 and 7.