JPS5842891A - Insulating pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention provides a center for use in securing insulation and air (water) tightness by being installed, for example, through the wall of a metal airtight container or interposed between metal pipes. The present invention relates to an insulated pipe joint having a through hole in the part thereof.

Conventionally, they have been widely used as parts necessary for transporting chlorofluorocarbons as cooling media and other gases and p-liquids, but because the range of temperature changes under the operating conditions is narrow, special consideration must be given to wide temperature changes. At present, there is no material that can be used at temperatures of about 300° C., including mechanical strength, which has a particularly poor deterioration in air (water) properties at high temperatures.

Recently, with the rise in the price of petroleum resources, full-scale development is underway to extract oil from the oil deposits buried underground in countries such as Canada and Pennsylvania. This oil sand exists in a layer approximately 50 meters thick underground in 5001, but this oil has a high viscosity and cannot be extracted by sucking it up at room temperature, so currently it is being heated to form an oil sand layer. The method used is to inject water vapor to raise the temperature of the oil content, lower its viscosity, and suck it up, but this method is more efficient (in order to produce it at a lower cost, one underground RC
Two oil sampling pipes with electrodes were installed at an interval of approximately 50 m at the tips of the buried steel pipes located in the oil sand layer.
A method of extracting oil by applying a voltage of about 4000 V between both electrodes 1 and raising the temperature of the oil sand layer using Joule heat to lower the viscosity of the oil is being seriously considered.

By the way, since the resistivity of the oil sand layer is higher than the resistivity of the upper stratum (actually about 10 times), it is necessary to interpose an insulated pipe joint between the steel pipe installed in the stratum tcJl and the electrode buried in the oil sand layer. There is. If no insulated pipe joints are used, the current will flow through the strata and reach the target oil sand layer K.
Current no longer flows between the electrodes. As a result of the above, demand for insulated pipe joints has rapidly increased.

The age of the insulation tube used for the above purpose is A, -1x,, <
(The characteristics that must not be met are as follows. Since the electrode is held suspended, the mechanical strength, especially the tensile strength, must be high. It can withstand a voltage of 4000V and maintain complete insulation. Withstand voltage including creepage insulation resistance. The electrode section is exposed to a temperature of approximately 300°C, and under this condition it must maintain air (water) tightness, mechanical strength, and electrical properties.It must have excellent cold and thermal shock resistance.

When buried in the oil sand layer, an electrode is suspended from the tip.
It is connected to a steel pipe and sunk into a buried hole, but it may come into contact with the hole wall. It is necessary to maintain mechanical impact strength that will not cause damage due to this contact, and that the offshore central through-hole has dimensions equal to the inner diameter of the upper steel pipe and electrode section, resulting in low flow resistance, and that the outer diameter dimension is as thin as possible. Naturally, the hole does not require a large diameter, and it is naturally required that it be easy to connect with the steel pipe and the electrode part.

In the case of this type of insulated pipe joint, the basic structure is to interpose an insulator between the two conduits to provide a hermetically sealed seal, and the insulator has the greatest control over the above-mentioned necessary characteristics. Of course, it is closely related to the metal fitting material and structure used, but these are also largely controlled by the insulator.

First, this insulator will be explained. First of all, organic materials are essentially impossible to use if the operating conditions are 300°C, as they undergo deterioration or softening phenomena.

Next, regarding inorganic materials, glass and porcelain materials are preferably used when the usage conditions are room temperature.
When used under a temperature condition of -0° C., the thermal shock strength is low, such as cracks occurring due to temperature changes, and the mechanical shock strength is also essentially weak, making it completely impossible to use it. After comprehensively evaluating the above-mentioned necessary properties, we selected glass, mica plastics, and mica powder as the raw material for the Song dynasty's clay, which is the most excellent and has the potential for use. An insulator obtained by heating glass to a temperature at which it softens and flows under pressure, and then press-molding it in the heated state.

The present inventors have previously proposed an insulated pipe joint that uses glass or mica plastic as an insulator, and that is the most ideal for the required characteristics under usage conditions where the conventional usage temperature is close to room temperature and the temperature variation range is narrow. There is something.

This will be explained below with reference to FIG. 1@1 & 41 is a longitudinal cross-sectional view showing the state of the molded product, and Fig. 1- is a longitudinal cross-sectional view showing the structure of the product.
Under normal temperature operating conditions, this insulated pipe fitting maintains sufficiently satisfactory characteristics in terms of water-free tightness, mechanical strength, cold and heat resistance, mechanical shock strength, and electrical properties, and has no unevenness in the through hole. The circulation resistance is low and ideal, but 300
It has a fatal flaw in that its air (water) properties rapidly deteriorate when the temperature reaches ℃.

The relationship will be explained below. Since this relationship is closely related to the manufacturing method, the manufacturing method will first be explained with reference to FIG. 2 to facilitate understanding. FIG. 2-1 shows the state immediately before pressure molding during manufacturing (Fig. 2-1 is a vertical sectional view showing the state after pressure molding is completed).

Prepare the following 2s types of metal fittings. In the figure, (1) is a cylindrical first tubular member, which connects and holds the outer peripheral metal fitting 18) through the upper shoulder part (1-1), and has a ring-shaped holding base (1
-2). (The powder is attached to the second tubular member, and at the bottom there is a support part whose outer periphery fits into the inner periphery of the first tubular member (1).
2-2).

As raw materials, a mixed powder of glass powder with a transition temperature higher than 360°C and synthetic fluorine-containing gold mica powder is used. Moisture is added to this mixed powder to make it wet, and a separate mold (not shown) is used. The mold 2 used as the preformed body (6) is formed by cold pressure molding into a shape that can be inserted into the space between the second tubular member (2) and the wall (wooden wall), and dried to remove moisture. Frame (7), wall of divided structure (8), support metal (9)
, use a pressure gauge made up of 9 or more parts.

Molding is carried out using the inner frame (7), wall (8) and support metal (
9) As shown in Figure 2←IK, the first and second tubular members (1), 1
1) and the preform (to)) are each heated to a processing temperature. When heating is completed, first place the first tubular member (1) on the supporting metal +91, then place the second tubular member (11) on the support plate +91.
, 1-2), and finally attach the preform shaft) to the outer peripheral fitting (2
). The state at this time is shown in FIG.
6) Place the preformed rod on top and pressurize the preformed rod with a pressure molding machine to form the space +41. (4-1) Press-fit K. A portion remains on the outer peripheral fitting (3) and constitutes an insulator (5). Pressure is continued until the transition temperature of the raw glass is reached. The state at this time is shown in Figure 2-.

Insulator! When the temperature of 51 reaches the glass transition temperature, the pressure is stopped and the molded product is decomposed and the molded product shown in Fig. 1 is taken out and machined.
The product shown in is formed.

The preform (...) varies depending on the composition of the glass, but it can flow sufficiently under pressure.5 tc 80Q°~900'CK
heated. The first and second tubular members are heated to 600 °C'
-m℃ and the mold is heated to a temperature 100'D-15 planes higher than the transition temperature of the raw glass constituting the preform (for example, 460' if the transition temperature is 360℃)
Heat to 510°C.

Next is qi, (7k) the most significant influence on density is the first.
and a second tubular member, and glass as an insulator;
Regarding the thermal expansion coefficient of mica plastic bodies (in this case, it is the thermal contraction rate, but it is expressed as the general thermal expansion coefficient.), it maintains the highest degree of air (water) tightness at room temperature. Second tubular member (2) K thermal expansion coefficient 11x
10- Insulating iron material (6) Glass with a thermal expansion coefficient of 12x10-a below the transition temperature of K glass.

The mica plastic body is also fitted with an outer peripheral metal fitting (3) K thermal expansion coefficient 18x1
(Use R' stainless steel. Glass and mica plastic bodies can flow in a temperature range higher than the transition temperature of glass, and at the same time have an extremely large coefficient of thermal expansion. Therefore, when the transition temperature is reached, the second tubular member (2) and the outer peripheral fitting 18)
The space (4) K has no voids and is filled with an insulator (6). The state of thermal contraction of each component from the transition temperature to room temperature is that the joists with a large coefficient of thermal expansion contract sharply.
The contraction of the outer circumferential fitting (3) is maximum, compressing the insulator (6) on its inner circumference, and a tightening pressure is generated during this time. Similarly, the insulator (5) is located on the inner circumference #! The tubular member (L) of No. 2 is compressed and a similar tightening pressure is generated.Therefore, no voids can exist on the inner and outer peripheral surfaces of the insulator (5), resulting in extremely high air (water) tightness. will hold.

By the way, each part of the above-mentioned insulated joint undergoes thermal expansion when the temperature rises by nearly 300°C, but since the coefficient of thermal expansion of the outer peripheral fitting 13) is larger than that of the insulator (6), the tightening pressure disappears. Insulators that create voids on their contact surfaces (
6) and the tubular member (2) of the building 2, the same phenomenon as described above appears. This phenomenon inevitably reduces air (water) tightness, which is an unavoidable fatal defect.

This invention was made in consideration of the above point K, and the object is to obtain an insulated pipe joint whose air (water) tightness does not deteriorate even when the temperature rises. An embodiment of the present invention shown in FIG. Figure 3 shows the state after completion of molding. Figure 3 1o1 is a sectional view showing the structure of the product after machining. The first tubular member (1) K is the same as the conventional product shown in Figure 1. Similarly, the shoulder area (
1-1) is a structural trap that holds the outer peripheral fitting (8) and is made of steel.

The second tubular member (2) has an inner periphery made of a material with a higher coefficient of thermal expansion than the material of the tubular member (2) at about 1/2 of the tip of the outer metal fitting (8). It has a metal fitting 113. In the examples, the second tubular member (2) is made of a steel material with a coefficient of thermal expansion of 11 xl 0-', and the outer peripheral fitting (3) is made of steel material with a thermal expansion coefficient of 13 x 10 = F), and the inner peripheral fitting a@K
kt 18x10-' (D The part (2-3) is left in place, and the part (2-3) is fitted into the outer periphery of the part (2-3), and the upper end part is tightly connected to the second tubular member (2) by air (water).
13-1) Joined from K.

The insulator (6) is made of glass or mica plastic having a transposition temperature of 660° C. and a coefficient of thermal expansion of 12×10=lower than the transposition temperature. The molding is carried out in the same manner as the conventional product shown in FIG. 1, and the product shown in FIG. 3 is finished by machining.

The insulated pipe joint obtained in the above embodiment according to the present invention maintains a high degree of elasticity and characteristics even if the operating conditions rise to a temperature of about 300° C. or even if the temperature is repeatedly raised and lowered. The reason for this will be explained below. First, in order to obtain an insulated pipe joint that maintains air (water) tightness at a temperature of 600°C, the glass constituting the insulator and the raw material glass of the mica plastic body must have a transposition temperature of 3°C or higher. It is an essential condition to use one.

The air (water) tightness of the Momme product at room temperature is ensured at the portion where the second tubular member (4) faces the outer metal fitting (3), as in the conventional product. When the temperature rises and the outer peripheral fitting 1g+ expands, the air (water) tightness of this part decreases. On the other hand, since the inner metal fitting is made of stainless steel with a higher expansion coefficient than the outer metal fitting 13), the amount of expansion of the outer circumference is large and compresses the insulator (6) on the outer circumference.
5) compresses the inner peripheral surface of the outer peripheral fitting (3) located at the outer peripheral part. Therefore, no voids can be generated at the interface between the inner and outer peripheries of the insulator. In other words, as the temperature rises, tightening pressure is generated outward,
Highly gas-dense properties can be obtained.

As mentioned above, in the case of this insulating joint according to the present invention, when the temperature rises, the mechanical part whose air (water) tightness increases as the VC temperature rises is different from the part that maintains air (water) tightness at room temperature. Unlike conventional products, it maintains a high degree of air (water) tightness even when the temperature rises. On the other hand, when the temperature decreases, the air (water) tightness is replaced, so even if the temperature rises and falls repeatedly, the air (water) tightness does not deteriorate and is completely maintained in the entire temperature range up to about 300℃. characteristics are ensured.

Note that the inner peripheral metal fitting is connected to the second tubular member (2) and the joint (1).
3-1) When the characteristics of the opposing surfaces of the second tubular member (2) and the outer peripheral fitting 18) deteriorate due to high temperatures because they are bonded tightly (from VC to anhydrous), the second tubular member (3) ) and the inner peripheral metal fitting 0 as a route, the air (water) tightness will not deteriorate at all. However, as mentioned above, the usable temperature range is closely related to the dislocation temperature of the raw glass, When the temperature approaches that temperature, the viscosity of the insulating material itself decreases, and when subjected to compressive force, it deforms and no longer generates dispensing force, making it impossible to maintain its air (water) tight properties. For the above reasons, the maximum operating temperature is 50""0-6 below the transition temperature of glass.
0:C becomes low and warm.

In addition, in the example, the first. Although steel is used for the second tubular member and the outer metal fitting, and stainless steel is used for the inner metal fitting, the present invention is not limited to these materials. Based on the coefficient of thermal expansion of the outer metal fitting, the second tubular member may be smaller than this, and the inner metal fitting may be larger (there are no restrictions on the first tubular member).

As described above, the insulating joint according to the present invention has properties equivalent to the mechanical strength, electrical properties, cold and heat resistance, and mechanical impact strength that conventional products have. At the same time, the fatal flaw of conventional products, in which the water-free properties deteriorate as the temperature rises, has been completely eliminated, and even when the temperature rises and falls repeatedly, it always maintains a high degree of water-free properties. ) that maintains dense properties.

Therefore, under high temperature conditions, for example, as mentioned above, insulated pipe joints used to insulate the steel pipes and electrode parts used for oil extraction from oil sands, in this case the operating temperature is approximately 600°C, can be used without any fear. High-temperature gases have become possible in the manufacturing process of other chemical products.

Takahata:It has come to be effectively used for many purposes such as transporting liquids, and its technical and practical effects are extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the structure of a conventional insulated pipe joint, FIG. 1(a) shows the state after completion of molding, and FIG. 1(b) shows the structure of the product. Figure 2 is a vertical cross-sectional view showing the conventional manufacturing method of the insulated pipe joint shown in Figure 1. Figure 2 (rei) shows the state immediately before pressure forming, and Figure 2 (b) shows the state after completion of Kakuda forming. . Third
The figure is a longitudinal sectional view showing the structure of the insulated pipe joint according to the present invention.
Figure 3 ← - shows the state after completion of molding, and Figure 3 (b) shows the structure of the product. In the figure, (1) is the first tubular member, (1-1) is the shoulder, (1-2) is the holding base, ((9) is the second tubular member, and (2-2) is the support part. , (8) is the outer peripheral metal fitting * 141
s (4-1) space, (6) insulator, f6) preform, ()) frame, (8) wall, (9) support,
No is pressurized metal, 113 is inner metal fitting, (13-1) 4
-! . Agent Makoto Kuzuno - Figure 1 (4) C) Figure 2 (1) C) Figure 3 (C) Procedural amendment (spontaneous) Commissioner of the Japan Patent Office 1, Indication of the case Patent application Sho 56 -1400903
, person making the amendment 5, [Claims J and "Detailed Description of the Invention"] columns of the specification to be amended. & Contents of the amendment 1) Amend the "Claims" of the specification by adding a separate excerpt. 2) Change the “inner frame (?) J” on page 7, line 20 of the specification to “outside,”
Correct the frame (η). 3) Correct the "processing temperature" on page 7, line 20 of the specification to "processing temperature." 4) "Insulated joint" on page 10, line 7 of the specification is corrected to "insulated pipe joint." 5) Change “high coefficient of thermal expansion” on page 10, line 9 of the specification to “
It is corrected as "larger than the coefficient of thermal expansion." 6) "Insulation penetration joint" in the second line of page 13 of the specification is amended to "insulation pipe joint". 7) "Insulated joint" on page 14, line 11 of the specification is corrected to "insulated pipe joint." Scope of the Attached Patent Claims (Amendment) (1) A first cylindrical body and a first cylindrical body integrally formed at one end of the first cylindrical body and having an inner diameter larger than the outer diameter of the first cylindrical body. a first tubular member having two cylindrical parts; a second tubular member into which the second cylindrical part is inserted; and one end of the second tubular member facing the first cylindrical part; a third tubular member that is fitted into the second cylindrical body part and has a coefficient of thermal expansion larger than the coefficient of thermal expansion of the second cylindrical body part and has an outer diameter smaller than the inner diameter of the second cylindrical body part; and an insulator filled in the gap between the member and the second and third tubular members to air-tightly fix the first tubular member and the second and third tubular members. Insulated pipe fittings featuring human characteristics. (2) The insulated pipe joint according to claim 1, wherein the insulator is a glass-mica plastic body made of glass and mica powder. (3) The insulation according to claim 2, characterized in that the coefficient of thermal expansion of the glass-mica plastic body below the glass transition temperature is smaller than that of the second cylindrical portion of the first tubular member. pipe fittings.

Claims (3)

[Claims] (1) A first cylinder having a first cylinder and a second cylinder which is integrally formed at one end of the first cylinder and has an inner diameter larger than the outer diameter of the first cylinder. a second tubular member inserted into the second cylindrical body; and a second tubular member fitted into one end of the second tubular member facing the first cylindrical body; a third tubular member having a coefficient of thermal expansion greater than the coefficient of thermal expansion of the second cylindrical member and an outer diameter smaller than the inner diameter of the second cylindrical member; An insulation characterized by comprising: an insulator that is filled into the gap between the third tubular members and air (water)-tightly adheres the first tubular member and the second and third tubular members. pipe fittings. (2) The insulating joint according to claim 1, wherein the insulator is a glass-mica plastic body made of glass and mica powder. (3) A patent characterized in that the coefficient of thermal expansion of the glass-mica plastic body below the glass transition temperature is smaller than that of the second cylindrical part of the tubular member of the first part, as set forth in claim 2. Insulated fittings.