CN216743246U - Coating pipe for joint and coating pipe joint - Google Patents
Coating pipe for joint and coating pipe joint Download PDFInfo
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- CN216743246U CN216743246U CN202220275988.2U CN202220275988U CN216743246U CN 216743246 U CN216743246 U CN 216743246U CN 202220275988 U CN202220275988 U CN 202220275988U CN 216743246 U CN216743246 U CN 216743246U
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- Rigid Pipes And Flexible Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The utility model provides a coating pipe for a joint and a coating pipe joint, which do not generate poor air tightness and have high air tightness when pipes of different metals are jointed. One end of the joint coating pipe has a multilayer structure made of dissimilar metals, and the other end has a single-layer structure.
Description
Technical Field
The present invention relates to a coated pipe for a joint for connecting pipes made of dissimilar metals to each other, and a coated pipe joint for connecting the coated pipes.
Background
Conventionally, a joint made of copper has been mainly used for equipment such as refrigerant piping and valve devices of air-conditioning and refrigeration systems, but with the recent increase in copper price, the demand for stainless steel of the joint has increased for the purpose of reducing the amount of copper used.
However, since copper piping is still the mainstream at present, copper piping has to be assumed as a target of joint connection. In this regard, when connecting a copper pipe to a stainless joint, dissimilar metals are joined to each other. In the case of joining dissimilar metals to each other, brazing is often employed, but a flux is required in brazing, and in a state of being connected to an air conditioning/refrigeration system, there is a problem that it is difficult to completely remove the flux.
As a countermeasure, for example, as shown in fig. 10, a method of using a coated pipe 104 for a joint in which a copper layer 104a is formed on the inner surface on the side joined to a copper pipe 102 is considered. Here, the joint coating pipe 104 is connected to the stainless steel pipe 106 to form a coating pipe joint 108.
Thus, the copper layers of the same kind of metal can be joined without requiring flux, but for the use as refrigerant piping, the connecting portion 107 connecting the copper layer 104a of a different kind of metal and the stainless steel layer 106a is required to have airtightness in order to avoid external leakage of the refrigerant.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 63-194824
SUMMERY OF THE UTILITY MODEL
Problem to be solved by utility model
As a method for manufacturing the above-described joint coating pipe 104, a manufacturing method is known in which a material in which a plurality of metal plates are stacked is formed into a joint shape by deep drawing (see, for example, patent document 1). When the joint coating pipe 104 is manufactured by this method, the material is drawn thinly, which may cause wrinkles and cracks in the molded product.
When the covered pipe joint 108, which is formed by welding the joint covered pipe 104 and the stainless steel pipe 106, is joined to the copper pipe 102 (see fig. 10), the copper layer 104a and the stainless steel layer 106a are welded to each other at the joint 109 between the joint covered pipe 104 and the stainless steel pipe 106, which may cause unstable welding.
These problems cause a poor air-tightness between the copper layer 104a and the stainless steel layers 104b and 106a, and therefore, the production of the cladding pipe 104 for a joint having stable air-tightness quality is problematic.
The purpose of the present invention is to provide a highly airtight coating tube for a joint and a coating tube joint that do not cause an airtight failure when joining pipes of different metals.
Means for solving the problems
The joint coating pipe according to claim 1 of the present invention has a multilayer structure formed of different metals at one end portion and a single-layer structure at the other end portion.
Thus, even when the one end portion and the other end portion are joined to pipes made of different types of metals, a highly airtight coating pipe for joints can be provided without causing an airtight failure.
The joint coating pipe according to claim 2 of the present invention is formed using stainless steel as a main material, and is characterized in that the one end portion has a copper layer on the inside or outside of the stainless steel layer, and the other end portion has a single-layer structure of stainless steel.
Thus, a clad pipe for a joint having a structure in which one end portion has a multilayer structure formed of dissimilar metals of a stainless steel layer and a copper layer and the other end portion has a single-layer structure formed of only a stainless steel layer can be provided, and a high airtightness can be provided without causing an airtight failure when a copper pipe is joined to one end portion and a stainless steel pipe is joined to the other end portion.
In the joint coating pipe according to claim 3 of the present invention, the copper layer has an axial length of 0.1 to 1.2 inclusive relative to the outer diameter of the stainless steel layer, and the stainless steel layer has an axial length of 1.25 to 5.0 inclusive relative to the axial length of the copper layer.
That is, the coating pipe for a joint is preferably manufactured in such a size.
A covered pipe joint according to claim 4 of the present invention is a covered pipe joint using the joint covering pipe according to claim 2 or 3, wherein the other end portion of the joint covering pipe having a stainless steel single-layer structure is formed by welding to a stainless steel pipe, and the one end portion of the joint covering pipe is connected to a copper pipe by inserting the copper layer formed on the inner side or the outer side of the stainless steel layer into the outer circumferential surface or the inner circumferential surface of the copper pipe and airtightly bonding the copper layer.
In this way, since most of the covered pipe joint is made of stainless steel, the cost of the product can be reduced. Further, since the one end portion is connected to the copper pipe by the same metal as copper, soldering can be performed, and flux is not required, so that the process for connecting the coated pipe joint can be simplified.
Effect of utility model
According to the present invention, it is possible to provide a highly airtight clad pipe for a joint and a clad pipe joint that do not cause an airtight failure when pipes of different metals are joined.
Drawings
Fig. 1 is a diagram illustrating a clad pipe joint according to an embodiment.
Fig. 2 is a diagram showing a coating pipe for a joint according to an embodiment.
Fig. 3(a) to 3(c) are views showing a cladding material for producing a joint cladding pipe according to the embodiment and an original cladding pipe.
Fig. 4 is a diagram showing a processing apparatus for manufacturing a clad pipe according to the embodiment.
Fig. 5 is a diagram showing a specific dimensional example of the covered pipe joint according to the embodiment.
Fig. 6(a) to 6(c) are views showing a cladding material for producing a joint cladding pipe according to another embodiment and an original cladding pipe.
Fig. 7(a) to 7(c) are views showing a cladding material for producing a joint cladding pipe according to another embodiment and an original cladding pipe.
Fig. 8 is a view showing a coating pipe for a joint according to another embodiment.
Fig. 9 is a view showing a coating pipe joint according to another embodiment.
Fig. 10 is a view showing a conventional covered pipe joint.
In the figure:
2. 2' -a cladding pipe joint; 4. 4' -cladding pipe for joint; 4a — one end; 4b — the other end; 4 c-a stainless steel layer; 4 d-copper layer; 6-stainless steel tubing; 8-copper tubing; 10. 10', 10 "-cladding material; 10a, 10 a' -stainless steel plate; 10a1 — open pore; 10b, 10 b' -copper plate; 10b1 — open pore; 10 e-through hole; 12-a processing device; 14. 14' -primary cladding pipe; 102-copper piping; 104-cladding pipe for joint; 104 a-a copper layer; 104 b-a stainless steel layer; 106-stainless steel tubing; 106 a-stainless steel layer; 107 — a linking moiety; 108-cladding pipe joint; 109 — joint.
Detailed Description
Next, a description will be given of a utility model according to an embodiment of the present invention with reference to the drawings. Fig. 1 is a diagram showing a coating pipe joint 2 according to an embodiment. The covered pipe joint 2 is used as a joint for equipment (hereinafter, simply referred to as equipment) such as a refrigerant pipe and a valve device of an air conditioning and refrigeration system. Fig. 2 is a diagram showing a coating pipe 4 for a joint according to the embodiment.
As shown in fig. 1, the covered pipe joint 2 is formed by welding a joint covering pipe 4 to a stainless pipe 6, and is connected to a target copper pipe 8. As shown in fig. 2, the joint coating pipe 4 is formed by stacking a copper layer 4d on the inner diameter side of a stainless steel layer 4c from one end portion 4a to an intermediate portion in the axial direction, using stainless steel as a main material. Therefore, the one end portion 4a has a multilayer structure formed of dissimilar metals of the stainless layer 4c and the copper layer 4d, and the other end portion 4b has a single-layer structure formed of only the stainless layer 4 c.
Herein, the outer diameter (Ds) of the stainless steel layer 4c of the joint coating pipe 4 is 6mm to 35mm, and the layer thickness (Ts) of the stainless steel layer 4c is 0.3mm to 2.5 mm. The axial length (Lc) of the copper layer 4d is 0.1 to 1.2 inclusive relative to the outer diameter (Ds) of the stainless steel layer 4c, namely Lc/Ds. The axial length (Ls) of the stainless steel layer 4c is 1.25 to 5.0 inclusive relative to the axial length (Lc) of the copper layer 4d, i.e., Ls/Lc. The thickness (Tc) of the copper layer 4d is 0.1 to 1.0 inclusive relative to the thickness (Ts), i.e., Tc/Ts, of the stainless steel layer 4 c.
Next, a method for manufacturing the joint coating pipe 4 will be described. Fig. 3(a) is a view of a cladding 10 described later viewed from above, and fig. 3(b) is a view of the cladding 10 viewed from the side. First, a stainless steel plate 10a as a stainless steel disk and a copper plate 10b as a copper disk having an area (diameter) smaller than that of the stainless steel plate 10a are prepared, and as shown in fig. 3(a) and 3(b), the copper plate 10b is joined to one surface of the stainless steel plate 10a with their centers aligned, thereby producing the clad material 10. Here, the stainless steel plate 10a and the copper plate 10b are joined by diffusion bonding, pressure bonding, or the like.
Next, the clad material 10 is subjected to drawing processing using the processing apparatus 12 shown in fig. 4, thereby producing a raw clad tube 14 in a test tube shape in which the copper layer 4d is formed only on the bottom side on the inner diameter side as shown in fig. 3(c) (drawing step). Next, the bottom side of the original coating pipe 14 is cut to produce a coating pipe 4 for a joint as shown in fig. 2 (cutting step).
Next, as shown in fig. 1, the stainless steel pipe 6 of the facility is connected to the other end 4b of the joint coating pipe 4, and welded to produce the coating pipe joint 2. Here, since the copper layer 4d is not laminated on the other end portion 4b and the same kind of metal is welded to each other at the time of joining with the stainless pipe 6, it is possible to avoid welding instability due to welding of different kinds of metal such as copper and stainless steel, and to prevent a poor air-tightness at the joined portion of the other end portion 4 b.
The facility is shipped with the covered pipe joint 2 formed at the tip of the stainless steel pipe 6, and then connected to the copper pipe 8 at a delivery point. At the delivery point, as shown in fig. 1, one end portion 4a of the joint coating pipe 4 is inserted so that the outer peripheral surface of the copper pipe 8 overlaps the inner peripheral surface of the copper layer 4d, and is hermetically joined to the copper pipe 8 by brazing the same metal as copper over the entire periphery. Therefore, the joint portion at the one end portion 4a can prevent the air-tightness failure which is likely to occur when dissimilar metals are connected.
Fig. 5 is a diagram illustrating a specific dimensional example of the clad pipe joint 2 manufactured as described above, in which a case where the clad pipe joint 2 is manufactured by connecting a normal refrigerant pipe 8 having a layer thickness (Tcu) of 0.8mm and an outer diameter (Dcu) of 9.52mm to the inner peripheral surface of the joint clad pipe 4 according to the embodiment with 3/8 inches of copper pipe 8 is exemplified as an example.
The joint coating pipe 4 connected to the copper pipe 8 includes a stainless steel layer 4c having an outer diameter (Ds) of 12.02mm, an inner diameter (Dsi) of 10.42mm, an axial length (Ls) of 14mm, and a layer thickness (Ts) of 0.8mm, and a copper layer 4d having an outer diameter (Dc) of 9.62mm, an axial length (Lc) of 7mm, and a layer thickness (Tc) of 0.4 mm. Here, the axial length (Lc) of the copper layer 4d with respect to the outer diameter (Ds) of the stainless steel layer 4c, i.e., Lc/Ds, is 0.582. Further, the axial length (Ls) of the stainless layer 4c relative to the axial length (Lc) of the copper layer 4d, i.e., Ls/Lc, was 2.0. The thickness (Tc) of the copper layer 4d was 0.5 relative to the thickness (Ts) of the stainless layer 4c, i.e., Tc/Ts. When the copper pipe 8 and the joint coating pipe 4 are connected by brazing, the normal clearance is about 0.1 mm.
According to the utility model of the present embodiment, since the one end portion 4a has a multilayer structure formed of dissimilar metals of the stainless steel layer 4c and the copper layer 4d and the other end portion 4b has a single-layer structure formed of only the stainless steel layer 4c, it is possible to provide a highly airtight joint coating pipe in which the copper pipe 8 is joined to the one end portion 4a and the stainless steel pipe 6 is joined to the other end portion 4b without causing an airtight failure.
Further, by setting the minimum necessary area of the copper plate 10b used for the cladding 10, the copper plate 10b is not drawn and the generation of wrinkles in the original cladding pipe 14 (see fig. 3 a to 3 c) can be suppressed even when the cladding 10 is drawn, and thus, the airtight failure can be prevented from this point of view.
Further, since most of the coating pipe joint 2 is made of stainless steel, the cost of the product can be reduced.
In addition, in the case where a joint of a dissimilar metal such as stainless steel is joined to the copper pipe 8 by brazing, conventionally, flux is required, and the process becomes complicated, and flux and brazing filler metal become a factor of increasing the cost. In contrast, in the utility model relating to the embodiment, since the coated pipe joint 2 is joined to the copper pipe 8 in an airtight manner by the same kind of metal, which is also copper, flux is not required at the time of brazing, and the process at the time of connecting the coated pipe joint 2 can be simplified.
In the above-described embodiment, as shown in fig. 6(a) and 6(b), the original clad pipe 14 ' may be produced using a clad material 10 ' obtained by overlapping a stainless steel plate 10a with a copper plate 10b ' having an opening 10b1 formed at the center. In this case, since the opening 10b1 is formed in the copper plate 10b ', as shown in fig. 6(c), the copper layer 4d does not have a bottom portion after the drawing process is performed on the clad material 10', and the load in the cutting step can be reduced.
As shown in fig. 7(a) and 7(b), a stainless steel plate 10a 'having an opening 10a1 formed at the center thereof may be further overlapped with the copper plate 10 b' to produce a clad material 10 ″ having a through hole 10e formed at the center thereof. The cladding pipe 4 for a joint can be produced using the cladding material 10 ″. In this case, since both the copper plate 10b 'and the stainless steel plate 10 a' are open, as shown in fig. 7(c), the bottom portion is not formed after the drawing work is performed on the clad material 10 ″, and therefore, the cutting step itself can be omitted, and the clad pipe 4 for joint can be directly produced.
In the above embodiment, as shown in fig. 8, a clad pipe 4' for a joint may be produced by laminating a copper layer 4d on the outer diameter side of a stainless layer 4 c. In this case, the one end portion 4a has a multilayer structure formed of dissimilar metals of the stainless layer 4c and the copper layer 4d, and the other end portion 4b has a single-layer structure formed of only the stainless layer 4 c.
Here, similarly to the joint coating pipe 4 in which the copper layer 4d is laminated on the inner diameter side of the stainless layer 4c, the outer diameter (Ds) of the stainless layer 4c is 6mm to 35mm, and the layer thickness (Ts) of the stainless layer 4c is 0.3mm to 2.5 mm. The axial length (Lc) of the copper layer 4d is 0.1 to 1.2 inclusive relative to the outer diameter (Ds) of the stainless steel layer 4c, namely Lc/Ds. The axial length (Ls) of the stainless steel layer 4c is 1.25 to 5.0 inclusive relative to the axial length (Lc) of the copper layer 4d, i.e., Ls/Lc. The thickness (Tc) of the copper layer 4d is 0.1 to 1.0 inclusive relative to the thickness (Ts), i.e., Tc/Ts, of the stainless steel layer 4 c.
Here, as shown in fig. 9, the stainless steel pipe 6 of the facility is connected to the other end 4b of the joint coating pipe 4 'and welded to produce a coated pipe joint 2'. In this case, the same metal is also welded to each other when the stainless steel pipe 6 is joined, and therefore, a poor air-tightness at the joint of the other end portion 4b can be prevented.
Further, the one end portion 4a of the joint coating pipe 4' is inserted so that the inner peripheral surface of the copper pipe 8 overlaps the outer peripheral surface of the copper layer 4d, and is hermetically joined to the copper pipe 8 by brazing the same kind of metal, which is also copper, over the entire circumference, thereby preventing a poor air-tightness which is likely to occur when connecting different kinds of metals.
Further, as long as the one end portion 4a of the joint coating pipe 4, 4' has a multilayer structure formed of dissimilar metals, the stainless steel layer 4c and the copper layer 4d are not necessarily required, and for example, an aluminum layer may be provided on the inner diameter side of the stainless steel layer 4c instead of the copper layer 4 d. In this case, when the one end portion 4a is joined to an aluminum pipe not shown, the airtight failure can be prevented.
Claims (4)
1. A cladding pipe for a joint, characterized in that,
one end portion has a multilayer structure made of dissimilar metals, and the other end portion has a single-layer structure.
2. The cladding pipe for a joint according to claim 1,
is formed by taking stainless steel as a main raw material,
the one end portion is provided with a copper layer on the inner side or the outer side of the stainless steel layer,
the other end is of a stainless steel single-layer structure.
3. The cladding pipe for a joint according to claim 2,
the axial length of the copper layer is 0.1 to 1.2 inclusive relative to the outer diameter of the stainless steel layer,
the axial length of the stainless steel layer is 1.25 to 5.0 inclusive relative to the axial length of the copper layer.
4. A covered pipe joint using the covered pipe for a joint according to claim 2 or 3,
the other end portion of the joint coating pipe having a stainless steel single-layer structure is welded to a stainless steel pipe,
the one end portion of the joint coating pipe is connected to the copper pipe by inserting the copper layer formed on the inner side or the outer side of the stainless steel layer into the outer peripheral surface or the inner peripheral surface of the copper pipe and airtightly bonding the copper layer to the copper pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-049563 | 2021-03-24 | ||
| JP2021049563A JP2022148042A (en) | 2021-03-24 | 2021-03-24 | Clad pipe for joint, manufacturing method therefor, and clad pipe joint |
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| Publication Number | Publication Date |
|---|---|
| CN216743246U true CN216743246U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220275988.2U Active CN216743246U (en) | 2021-03-24 | 2022-02-11 | Coating pipe for joint and coating pipe joint |
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| JP (1) | JP2022148042A (en) |
| CN (1) | CN216743246U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024128258A1 (en) * | 2022-12-14 | 2024-06-20 | 株式会社鷺宮製作所 | Coated piping, method for forming coating, and coating member |
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- 2021-03-24 JP JP2021049563A patent/JP2022148042A/en active Pending
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- 2022-02-11 CN CN202220275988.2U patent/CN216743246U/en active Active
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| JP2022148042A (en) | 2022-10-06 |
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