JPS628474Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint for piping, and more specifically, to a joint for connecting pipes made of ceramic.

In metallurgy, casting, and other fields that handle molten metal, electromagnetic pumps are used as means for transporting the molten metal. This electromagnetic pump for molten metal consists of a duct for introducing molten metal and a stator placed outside the duct, and uses the molten metal introduced into the duct as a secondary conductor to apply a rotating magnetic field generated by the stator to the duct. and transfer it along the duct by applying thrust. In this case, the above-mentioned tact and other piping that transfers molten metal should be
Some kind of heat retention means, such as a preheater or insulation material, is applied to prevent the molten metal inside from cooling and solidifying.

By the way, the molten metal transported through the duct, taking aluminum as an example, has a melting point of 660.
℃, the temperature in the molten state is higher than that, and therefore the duct that transports it is required to have heat resistance sufficient to withstand the above temperature.
Furthermore, this duct is always in a state where it is easily corroded by the molten metal that passes through it, and for these reasons metal materials cannot be used in the duct, and ceramic materials such as pottery are used instead. be done. This is not limited to the above-mentioned electromagnetic pump, but regarding piping that transfers molten metal,
For the same reason, ceramic tubes are used in all cases.

Ceramic lacks elasticity compared to metal materials,
Furthermore, it has mechanical properties that are extremely brittle, and these problems in characteristics become a major problem when connecting piping. That is,
Ceramics are not compatible with commonly used means for connecting by tightening, such as bolts and nuts, or means for connecting by tightening the ends of the tubes together using the elasticity of a spring.
1 does not have enough strength and elasticity to adapt to the elasticity of the bolt, and in the latter case, the spring is likely to become flattened at high temperatures, so neither of these types of bolts can be used.

Under these circumstances, the connection of the ceramic tubes has heretofore been made exclusively with a special heat-resistant adhesive. However, the adhesive
Since it takes a long time to harden, it takes time to connect, and once connected, it cannot be easily separated. In addition, the mechanical performance achieved by adhesive connections is unstable, and there is a risk of large variations in strength compared to the planned strength in the design, etc. On the other hand, ceramic pipes bonded with high strength have It is extremely difficult to separate them, and even if a part of the piping is damaged, it will be necessary to replace the front and rear pipes as a whole.

This invention was an attempt to solve the above-mentioned conventional problems in connection means for ceramic pipes. The connected state is elastically tightened by a spring, and this spring is placed outside the area where the temperature is high, so that its elasticity can be fully exerted.
This makes it easy to connect and disconnect pipes, and always provides calculated strength and clamping force, simplifying piping and repair work, and improving the mechanical performance of fittings. This is aimed at stabilization. Hereinafter, the configuration of this invention will be explained in detail based on illustrated embodiments.

As shown in the drawing, the connecting ceramic tube 1,
Flanges 2, 2 are provided at the ends of 1, and these flanges 2, 2 are butted against each other and connected. Furthermore, this connection part, together with the ceramic tubes 1, 1, is covered with a heat insulating material 12. For example, this heat insulating material 12 may be a heat insulating method in which it is simply covered with a highly insulating material, or a preheating heater may be used. A heat generation method, etc., was adopted. In the embodiment shown in FIGS. 1 to 4, two ceramic tubes 1, 1 are connected in the longitudinal direction, and in the embodiment shown in FIG. A blind flange is used, which is connected to the ceramic tube 1.

In the embodiment shown in FIGS. 1 to 4, the flanges 2, 2 are provided with tapers 4a, 4a behind them, and the gap between these flanges 2, 2 has appropriate elasticity even under high temperatures. An annular packing 5 is interposed. The above flange 2,
2 is fitted with coupling rings 6, 6, which are divided into upper and lower parts in the figure, so as to straddle them. The coupling rings 6, 6 have the above-mentioned taper 4.
Tapers 4b, 4b matching with a, 4a are formed on the inner circumferential side thereof, and by tightening both coupling rings 6, 6 in the radial direction of the flanges 2, 2, the ceramic tubes 1, 1 are connected to each other along their longitudinal sides. tightened in the direction. In this case, the taper 4a may be provided only on one of the flanges 2, 2, and at the same time, the taper 4b may be provided only on one side of the couplings 6, 6 corresponding to the taper 4a.

The coupling rings 6, 6 have flanges 7, 7 extending in the radial direction on both sides, and the flanges 7, 7 of one coupling ring 6, 6 have screw holes 8,
8 is opened, and through holes 9, 9 are opened in the flanges 7, 7 of the other coupling ring 6, 6. On the other hand, the bolts 3, 3 connecting the coupling rings 6, 6
Sleeve 1 is considerably longer than the one normally used when connecting the
0 and 10, then inserted into the through holes 9 and 9, and then screwed into the screw holes 8 and 8. Furthermore, in this case, the heads of bolts 3, 3 and sleeve 1
0 and 10, springs 11, 11, . . . are interposed, and in the illustrated case, a disc spring is interposed. Therefore, when the bolts 3, 3 are properly tightened, the elasticity of the springs 11, 11, . . . acts to tighten the couplings 6, 6 in the radial direction, thereby tightening the ceramic tubes 1, 1 together. In this case, the strength with which the ceramic tubes 1, 1 are tightened can be adjusted as appropriate by adjusting the tightening conditions of the bolts 3, 3.

As already mentioned, the ceramic tubes 1 and the joint portion between them are covered with a heat insulating material 12 having a substantially constant thickness. On the other hand, the bolts 3, 3
has a considerable length and is erected approximately at right angles to the ceramic tubes 1, 1, so that the springs 11, 11, etc., which are attached near the head of the heat insulating material 12, It can be placed on the outside beyond the thickness. Therefore, the springs 11, 11... release the heat received from the bolts 3, 3 during molten metal transfer into the air, and do not reach extremely high temperatures.

On the other hand, in the embodiment shown in FIG. 5, the flanges 2, 2 are directly connected by bolts 3, 3 without using the coupling rings 6, 6 as described above. That is, the embodiment shown in the figure is a connection with a blind flange 2 made at the end of the pipe, and the heat insulating material 12 applied to this part is made by coating the right side of the blind flange 2, which is the end face of the pipe, with an appropriate thickness. It's just covered. Therefore, if the length of the bolts 3, 3 exceeds this thickness, even if the bolts 3, 3 are attached parallel to the ceramic tube 1, the spring 1 will be placed on the outside of the heat insulating material 12.
1, 11, etc. can be placed, and thereby the same heat radiation as above is performed.

It should be noted that, as a matter of course, the bolts 3, 3 are not screwed into one flange 2 as in the above embodiments, but nuts are screwed into the bolts 3, 3 inserted through the same flange 2, and both flanges are screwed together. 2 and 2 may be connected, and in the same way, other detailed and specific structures may be appropriately adopted as necessary.

As described above, according to this invention, the ceramic pipes 1, 1 can be connected by the bolts 3, 3, so that the connection and separation can be done more quickly than with conventional joints that exclusively use adhesives. In addition, it becomes possible to easily achieve the strength expected in the design. In addition, the springs 11, 11 are used for the ceramic tubes 1, 1, which are brittle and lack elasticity.
... tightens them with appropriate elasticity, so that the mechanical properties of the ceramic pipes 1, 1 that are lacking in making up the joint can be sufficiently compensated for, and moreover, the springs 11, 11... Since it is not exposed to high temperatures, stable tightening force can always be obtained.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional exploded perspective view showing an embodiment of this invention, Fig. 2 is a longitudinal sectional front view showing the same heat insulating material with imaginary lines, and Fig. 3 is a line taken along line A-A in Fig. 3. A sectional view, FIG. 4 is a sectional view taken along the line B-B, and FIG. 5 is a partially cutaway side view showing a heat insulating material with imaginary lines, showing an embodiment different from each of the above figures. . 1... Ceramic tube, 2... Flange, 3...
Bolt, 4a, 4b... Taper, 6... Coupling, 10... Sleeve, 11... Spring, 12...
...Heat insulation material.

Claims (1)

[Claims for Utility Model Registration] 1. A flange provided at the end of a ceramic pipe is brought into contact with a flange of another member to be connected to it, and both flanges are tightened and connected with bolts, and this connection is In the ceramic piping joint, which is covered with a heat insulating material together with the ceramic pipe, long bolts are inserted into the sleeve, and springs are interposed between the heads of these bolts and the sleeve, and the springs are inserted in the direction in which the flanges are tightened together. A ceramic piping joint characterized in that the elasticity of the spring is applied and the spring is located outside the heat insulating material. 2 At least one of the flanges has a taper on the back surface, a coupling ring with a matching taper is fitted across both flanges, and this coupling ring is tightened in the radial direction of the flange, thereby making the flange into a ceramic material. The ceramic piping joint according to claim 1, which is a utility model and is tightened in the longitudinal direction of the pipe.