JPH09126596A - Hose connecting port for outer plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose connecting port which has a large connecting strength and leakage preventing effect, easy processing and welding operations and makes it possible to effectively connect a hose. SOLUTION: The hose connecting port 100 for an outer plate comprises a pipe drawing hole 11 at the metal outer plate 12 of an apparatus to draw the end of a copper pipe 10 from the interior of the apparatus through the hole 11 and a rubber hose 13 connected to the end of the pipe 10. The flange 15 covering the outer peripheral edge of the hole 11 is welded to the outer peripheral edge of the hole 11 of the plate 12 by using a metal support cylinder 1 having the flange 15 covering the outer periphery of the hole 11 at one end and an engaging part 16 externally engaged with the end of the pipe 10 at the other end and an annular expanded part 17 externally engaged with the hose 13 at the intermediate, and the part 6 of the cylinder 1 is welded to the engaging part of the end of the pipe 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connection port for connecting a hose to a pipe provided through an outer plate of a device.

[0002]

2. Description of the Related Art In an absorption refrigeration system, a low-concentration aqueous solution (absorption liquid) of lithium bromide or the like is heated and boiled in a regenerator to produce a solution (refrigerant) such as water and a high-concentration absorption liquid (high-concentration liquid). Lithium bromide solution of concentration). The refrigerant is liquefied by a condenser provided with a cooling coil, supplied to the evaporator, and removes heat of evaporation from the evaporation coil arranged in the evaporator.

In this absorption refrigeration system, the internal piping is
A copper pipe having excellent heat conductivity and workability is used, and a stainless plate having excellent corrosion resistance is used as a container forming the refrigerating apparatus main body. Further, a hose made of rubber or the like is used to connect the piping of the refrigerating apparatus main body and the cooling tower (cooling tower) arranged in parallel.

In the structure in which the hose is connected to the tip of the pipe protruding through the container wall (outer plate) made of stainless steel, the sealing property of the through hole and the strength of the hose connecting portion are important from the viewpoint of durability. Conventionally, the hose connection port of the outer plate is formed by nickel brazing a copper base which is machined into a hole provided in a stainless outer plate, and further copper brazing a copper base and a copper pipe.

[0005]

However, since the conventional hose connection port of the outer plate is brazed, the seal portion is apt to crack and leak over time, and has insufficient mechanical strength. However, there was a problem that the durability was insufficient. An object of the present invention is to provide a hose connection port for an outer plate, which has a large effect of increasing connection strength and durability of leakage prevention, is easy to process and weld, and can reliably connect a hose.

[0006]

The hose connection port of the outer plate of the present invention is provided with a pipe drawing hole in the metal outer plate of the device,
A method for pulling out a tip end of a metal pipe from the inside of the outer plate through the pipe lead-out hole and connecting a hose to the tip end of the pipe, which is joined to an edge portion of the pipe lead-out hole by welding Using a metal support tube having a plate welded portion, an outer fitting portion that is fitted around the pipe drawn out from the pipe lead-out hole, and a pipe welded portion that is joined by welding to the tip end portion of the pipe, The hose is fitted around the outer fitting portion.

According to the second aspect of the present invention, the outer plate welded portion is the outer edge of the flange portion that covers the outer peripheral edge of the pipe drawing hole. In the configuration according to claim 3, the pipe lead-out hole is formed inside a tubular portion provided so as to project the outer plate outward, and the tubular portion has a tapered shape that expands outward of the outer plate. The outer plate welded portion is an outer edge of a folded-back flange portion that is folded back toward the outer fitting portion, conforms to the tapered shape of the tubular portion, and contacts the inside of the tubular portion. In the structure according to claim 4, the outer fitting portion has an annular bulging portion for fixing the hose in the middle.

In the structure according to claim 5, the outer plate and the support cylinder are made of stainless steel, the joint between the outer plate and the support cylinder is welded, and the pipe is a copper pipe. The support cylinder and the support cylinder were welded using a nickel welding rod. In the configuration according to claim 6,
The support cylinder was press-molded, and the annular bulging portion was molded by beading. In the configuration according to claim 7, the outer plate of the device is a container wall of a refrigerator main body of an absorption refrigerating device including an airtight container in which a low-pressure absorbing liquid vapor is contained, and the pipe is heat-exchanged. It is characterized in that it is a circulation pipe of a liquid medium for performing. In the configuration according to claim 8, the outer plate of the device is a cylindrical surface, and the pipe lead-out hole is provided in an outwardly bulging flat surface formed in the outer plate.

[0009]

According to the present invention, since the support cylinder is fixed to both the outer plate and the pipe by welding, the fixing strength is large and the leak resistance is excellent. In the structure of claim 2, since the flange portion is simple, the support cylinder can be easily manufactured. In the structure of claim 3, the support cylinder can be removed by shaving the outer plate welded portion and the pipe welded portion, and re-welding is also easy. Only by inserting the taper-shaped return flange portion into the tapered tubular portion (inside the pipe withdrawal hole) that spreads outward, the pipe withdrawal hole and the support tube are aligned, and positioning during welding becomes easy.
Since the welding can be performed by melting the ends themselves of the outer plate welded portion and the pipe welded portion, a welding rod can be eliminated and welding workability can be improved. In the structure of claim 4,
Since the annular bulging portion is provided in the middle of the outer fitting portion, the joint strength between the hose and the outer fitting portion is large.

According to the structure of claim 5, welding can be made strong. According to the structure of claim 6, the support cylinder is easy to manufacture, and the elasticity of the beaded annular bulging portion of the support cylinder can absorb expansion and contraction of the material due to temperature and time-dependent deformation, and durability of the welded portion. Is effective in improving. According to the configuration of claim 7, it is possible to effectively cope with the corrosiveness of the absorbing liquid, and it is possible to prevent the occurrence of troubles such that the refrigerant leaks from the welded portion or the airtight container leaks airtightly to lower the refrigerating capacity. With the configuration of claim 8, the welding work of the support cylinder to the outer plate is easy to perform, and it is convenient for drawing out the copper pipe curved inside the equipment.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIG. 1 shows a hose connection port 100 for connecting a rubber hose 13 by welding a support tube 1 to an outer plate 12 having a drawing hole 11 of a copper pipe 10. Drawout hole 1
Reference numeral 1 denotes a circular bulging plane 1 provided on an outer plate 12 which is a cylindrical surface.
It is opened at the center of 4 and has a larger diameter than the copper pipe 10. The pipe 10 is made of copper because copper has high heat conductivity and good heat exchange efficiency.

The support tube 1 is formed by pressing a pipe material, has a flange portion 15 welded to a bulging flat surface 14 on the outer peripheral side of the drawing hole 11 at one end, and has a copper pipe 10 at the other end. It has an outer fitting portion 16 with the tip. In this embodiment, the flange portion 15 has a bell mouth shape, and an annular bulge portion 17 bulged to the outer peripheral side by beading is provided in the middle of the flange portion 15 and the outer fitting portion 16 of the support cylinder 1. ing. The tip of the copper pipe 10 is an expanded portion 18 so as to surely abut the outer fitting portion 16.

In this embodiment, the outer plate 12 is the outer peripheral wall of the airtight container 50 of the condenser 5 and the airtight container 30 of the absorber 3 and the evaporator 4 of the absorption type refrigerating apparatus 200, which will be described later. SUS444, which is a stainless steel, is used. For the support cylinder 1, ferritic stainless steel such as SUS444 is used. The reason why the ferritic stainless steel is used as the corrosion-resistant metal material instead of the austenitic stainless steel is that the residual stress due to welding is small and the occurrence of cracks can be prevented.

The welding of the support tube 1 to the outer plate 12 is performed as shown in FIG.
2B, the flange portion 15 is overlapped on the circular bulging plane 14, and TIG welding is performed over the entire circumference as shown in FIG. 2B (the flange portion welded to the outer plate 12). 15
Outer edge corresponds to the outer plate weld). TIG welding is used to minimize the deformation and deterioration of the welded part. The welding of the expanded portion 18 at the tip of the copper pipe 10 and the tip of the outer fitting portion 16 of the support tube 1 is performed by TIG welding using a welding rod made of nickel along the entire circumference (the tip of the copper pipe 10 and The tip of the outer fitting portion 16 joined by welding corresponds to the pipe welding portion). This is a nickel support tube 1
This is because it is easily compatible with both the ferritic stainless steel and the copper of the copper pipe 10.

In this embodiment, the outer plate 12 is bulged and the circular bulging flat surface 14 is provided on the top thereof because the welding surface is a cylindrical surface using the outer peripheral walls of the airtight containers 30, 50 as they are. If so, the shape of the flange portion 15 becomes complicated and the machining becomes troublesome. In this case, the outer plate 1
A gap is generated between the flange 2 and the flange portion 15, and leakage is likely to occur, and the welding work is troublesome.

The outer plate 12 bulges outward is a heat exchanger in which the main body of the copper pipe 10 is wound in a coil shape, and is bent 90 degrees from the main body to insert the drawing hole 11 therethrough. In this case, it is because the curved portion prevents the curved portion from interfering with the edge of the drawing hole 11. As shown in FIG. 1, a rubber hose 13 is externally fitted to the support tube 1 at the hose connection port 100, and the tip of the rubber hose 13 is pushed over the annular bulging portion 17 and fixed by a band 19.

FIG. 3 shows an absorption type refrigerating apparatus 200 which employs the hose connection port 100 of the outer plate 12 to which the rubber hose 13 of the present invention is connected. The absorption refrigeration system 200 is provided with a cooling tower (cooling tower) CT and constitutes a cooling / heating system together with the indoor unit 300. 40
Reference numeral 0 indicates a control circuit of the cooling / heating device.

The absorption type refrigerating apparatus 200 comprises a high temperature regenerator 21.
And a regenerator 2 having a low temperature regenerator 22 for separating a refrigerant (water) from a low-concentration absorption liquid (lithium bromide aqueous solution). A gas burner B as a heating source is arranged below the high temperature regenerator 21. The low temperature regenerator 22 is arranged above the high temperature regenerator 21 and has a vertical cylindrical airtight container 20 made of stainless steel.

An absorber 3 is provided on the outer periphery of the low temperature regenerator 22, an evaporator 4 is provided on the outer periphery of the absorber 3, and a condenser 5 is mounted above the evaporator 4. The regenerator 2, the absorber 3, the evaporator 4, and the condenser 5 are arranged concentrically and welded together to form a refrigerator main body 500.

The absorber 3 is provided with a cooling coil 31 wound in a vertical cylindrical shape inside an inner portion of an annular airtight container 30 provided on the outer periphery of the low temperature regenerator 22, and above the cooling coil 31. A high-concentration absorbent sprayer 32 for spraying the high-concentration absorbent is mounted on 31. The bottom part of the absorber 3 and the bottom part of the high temperature regenerator 21 are connected by an absorption liquid supply passage in which a heat exchanger H and an absorption liquid pump P1 are interposed.

The condenser 5 is an annular airtight container 50 provided on the outer periphery of the low temperature regenerator 22 and above the airtight container 30.
A condenser coil 51 is arranged inside the. Above the low-temperature regenerator 22, there is a gas-liquid separating section 23, which communicates with the upper part of the condenser 5 via a gap 5A. The lower part of the condenser 5 and the refrigerant liquid sprinkler 42 installed above the evaporation coil 41 of the evaporator 4 are in communication with each other through a refrigerant liquid supply passage in which a solenoid valve V3 with an orifice is interposed.

The cooling coil 31 is connected to the condensing coil 51, and is further connected to the cooling tower CT by the circulation path L, and the cooling water is cooled by the cooling water pump P2 from the cooling tower CT → cooling coil 31 → condensing coil 51 → cooling. It circulates in the order of tower CT. Absorbing liquid is regenerator 2 → absorber 3 → absorbing liquid pump P1
→ Circulate in the order of the regenerator 2.

In this embodiment, the outer plate 12 is the outer peripheral wall of the airtight containers 30 and 50, and the copper pipe 10 is a cooling coil 31 and an evaporation coil 41 which are wound in a coil shape, respectively.
And the condenser coil 51. The ends of each coil penetrate the outer plate 12 which is a cylindrical side wall of the airtight containers 30 and 50 and are drawn out to the outside, and a rubber hose 13 for connecting to the cooling tower CT or the indoor unit 300 is connected. .

This embodiment has the following effects. 1) The outer plate 12 and the flange portion 15 are TIG-welded, and the copper pipe 10 and the outer fitting portion 16 are welded by using a nickel welding rod, so that the welding strength is large and the sealing property is excellent. Therefore, the refrigerant vapor leakage from the refrigerator main body 500 can be prevented for a long period of time.

2) Since the inside of the outer plate 12 of the refrigerator main body 500 (the inside of the container) has a low pressure, an external force is directly applied from the flange portion 15 due to the pressure difference between the atmospheric pressure and the inside during the operation of the refrigerator. , Join the outer plate 12. Therefore, no external force is generated in the TIG welded portion in the direction of separating the welding surface, and the sealing property is maintained for a long time.

3) Since both TIG welding and nickel rod welding can be performed from the outside of the outer wall, the welding work is easy and the work is easy to automate. 4) A stress may be applied to the welded portion due to relative displacement between the outer plate 12 and the copper pipe 10 due to temperature changes such as during operation and during operation stoppage, and time-dependent deformation. And has elasticity, it is possible to reduce the stress applied to the welding surface.

[Second Embodiment] FIGS. 4 and 5 show a second embodiment. FIG. 4 is a sectional view of the hose connection port 100.
FIG. 5 is an explanatory diagram showing a procedure for assembling the hose connection port 100. In the above embodiment, the flange portion 1 of the support tube 1
5 covers the outer peripheral edge of the drawing hole 11 and welds the outer edge of the flange portion 15 (corresponding to the outer plate welded portion) to the outer plate 12. By providing in this way, although the above-mentioned effect can be obtained, there are the following problems.

A1) After welding, it is difficult to remove the support cylinder 1 from the outer plate 12 or perform re-welding at the time of maintenance such as repair. b1) Since the flange portion 15 was provided in a bell mouth shape, the flange portion 15 and the outer peripheral edge of the drawing hole 11 (the outer plate 1
A liquid pool is likely to be formed between the liquid and the bulging flat surface 14) provided on the second surface, and corrosion may occur in this liquid pool.

C1) Since the flat surface of the flange portion 15 is aligned with the outer peripheral edge of the drawing hole 11 (the bulging flat surface 14 provided on the outer plate 12) and welding is performed, the axes of the drawing hole 11 and the support cylinder 1 are aligned. It was difficult to align them, that is, positioning was difficult during welding, and it was difficult to keep the overlap margin between the flange portion 15 and the outer peripheral edge of the drawing hole 11 constant. d1) The welding rod is required because the outer periphery of the extraction hole 11 (the bulging plane 14 provided on the outer plate 12) is aligned with the flat surface of the flange portion 15 and the outer edge of the flange portion 15 is welded. Workability is poor.

The second embodiment is made to solve the above-mentioned problems, and adopts the structure shown in FIG. That is, first, the extraction hole 11 is formed by the outer plate 12 (the bulging plane 1).
4) It is provided inside a cylindrical portion 11t provided in a tapered shape that protrudes outward of 4) and spreads outward of the outer plate 12. In addition, in this embodiment, the taper angle of the cylindrical portion 11t is set to 60 °, but it may be set to another angle.

The outer peripheral side of the support cylinder 1 has an outer fitting portion 1
A folded-back flange portion 15a that is folded back to the 6 side and is in contact with the inner surface of the tubular portion 11t is provided in conformity with the tapered shape of the tubular portion 11t. The folded-back flange portion 15a of this embodiment is provided at 60 ° ± 0.5 ° so as to match the taper angle of the tubular portion 11t, but the taper angle of the tubular portion 11t is 60 °. If they are different, the angle is set according to the taper angle of the cylindrical portion 11t.

The welding of the support cylinder 1 to the outer plate 12 is performed as shown in FIG.
As shown in (a) and (b), the outer fitting part 16 of the support tube 1 is fitted to the end of the copper pipe 10 and the tube part 1
The folded back flange portion 15a is fitted inside 1t.

Next, the tip of the superposed copper pipe 10 and the tip of the outer fitting portion 16 are melted by using a welding machine to weld the tip of the copper pipe 10 and the tip of the outer fitting portion 16 (copper pipe). The tip of the outer fitting portion 16 joined to the tip portion of 10 by welding corresponds to a pipe welded portion), and the tip of the overlapped tubular portion 11t and the tip of the folded back flange portion 15a are melted to form the tip of the tubular portion 11t. The tip of the folded flange portion 15a is welded (the tip of the folded flange portion 15a that is welded to the outer plate 12 corresponds to the outer plate welded portion). As described above, the support tube 1 is fixed to both the copper pipe 10 and the outer plate 12 by welding, and high fixing strength and high leak resistance can be obtained.

Since the support cylinder 1 of the second embodiment is provided as described above, the following effects can be obtained. a2) After welding, a pipe weld (a weld between the end of the copper pipe 10 and the end of the support cylinder 1) and an outer plate weld (a weld between the end of the cylinder 11t and the end of the folded flange 15a) are cut by a cutting machine. The support cylinder 1 is cut off with an outer plate 12 or the like.
It can be easily removed from. Also, the support tube 1
Can be easily reassembled to the outer plate 12 and welded at both ends to be joined. Therefore, the maintainability such as repair is improved as compared with the first embodiment.

B2) Inside the tapered cylindrical portion 11t,
Since the folded-back flange portion 15a that matches the taper angle is fitted and joined, the liquid is unlikely to accumulate between the outer plate 12 and the folded-back flange portion 15a. Therefore, it is possible to suppress the possibility that corrosion will occur between the outer plate 12 and the return flange portion 15a.

C2) Inside the tapered cylindrical portion 11t,
Since the axial centers of the pull-out hole 11 and the support cylinder 1 coincide with each other only by fitting the folded-back flange portion 15a that matches the taper angle, the positioning can be performed very easily. Therefore, the overlap margin between the support cylinder 1 and the outer plate 12 can be always kept constant.

Inside the tapered cylindrical portion 11t, the folded-back flange portion 15 matching the taper angle is formed.
Since a is fitted, even if a manufacturing error occurs in the inner diameter of the cylindrical portion 11t and the outer diameter of the folded flange portion 15a, the error is absorbed in the overlapping margin.

D2) The tip of the copper pipe 10 and the tip of the outer fitting portion 16 which are overlapped with each other are melted and welded, and the tip of the overlapped cylindrical portion 11t and the return flange portion 1 are formed.
Since the tip of 5a was melted and welded, a welding rod is not required, and welding workability is improved as compared with the first embodiment.

[Third Embodiment] FIG. 6 is a perspective view of an outer plate showing a third embodiment. In the third embodiment, the hose connection port 100 shown in the second embodiment is connected to the hose connection of the airtight container 30 which covers the absorber 3 and the evaporator 4 of the absorption refrigeration apparatus 200 shown in the first embodiment. It is applied to the part.

The airtight container 30 is made by joining the semi-cylindrical outer plate 12 shown in FIG. 6 and another semi-cylindrical outer plate 12a to each other.
The outer peripheral wall of the cylindrical airtight container 30 is formed. This third embodiment is based on the cooling tower CT 2
Cooling water is guided by a rubber hose 13 of a book,
The outer plate 12 forming the airtight container 30 is provided with two withdrawal holes 11a for drawing the cooling water inside, and is provided for guiding the two series of cooling water passing through the airtight container 30 to the outside. Two drawer holes 11b are provided.

In the third embodiment, the two outlet holes 11a for drawing the cooling water into the interior are provided in the indoor unit 3
3 together with one withdrawal hole 11c for drawing cold and hot water that has passed through 00 into the airtight container 30,
It is formed on one lower bulging plane 14a.

Similarly, 2 for discharging the cooling water to the outside
Three extraction holes 11b are formed together with one extraction hole 11d for guiding the cold / hot water that has passed through the evaporator 4 to the indoor unit 300, and are formed on one upper bulging plane 14b. The drawing hole 11e shown in FIG. 6 is a hole for supplying the refrigerant, which is drawn out from the condenser 5 to the outside to the inside of the evaporator 4, and the drawing hole 11e also has the hose connection port of the second embodiment. 100 is adopted.

[Modification] In the above embodiment, the case where the present invention is applied to the absorption refrigerating apparatus 200 has been described.
In other equipment such as electric refrigeration equipment and automobile refrigeration equipment as long as it is a hose connection port of the outer plate that penetrates the outer plate from the inside of the main body of the device and pulls out the metal pipe to the outside and connects the hose to the pipe The present invention can be applied.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hose connection port of an outer plate (first embodiment).

FIG. 2 is an assembly diagram of a hose connection port of an outer plate (first)
Example).

FIG. 3 is a conceptual diagram of an absorption refrigeration system (first embodiment).

FIG. 4 is a sectional view of a hose connection port (second embodiment).

FIG. 5 is an assembly diagram of a hose connection port (second embodiment).

FIG. 6 is a perspective view of an outer plate (third embodiment).

[Explanation of symbols]

 1 Support Cylinder 2 Regenerator 3 Absorber 4 Evaporator 5 Condenser 10 Copper Pipe (Metallic Pipe) 11 Draw-out Hole (Pipe Draw-out Hole) 11a Cylinder 12 Outer Plate (Metal Outer Plate) 13 Rubber Hose 14 Swelling Plane 15 Flange part 15a Folded back flange part 16 External fitting part 17 Annular bulging part 100 Hose connection port 500 Refrigerator body

Claims (8)

[Claims] 1. A metal outer plate of a device is provided with a pipe lead-out hole, the tip of the metal pipe is pulled out from the inside of the outer plate through the pipe lead-out hole, and a hose is connected to the tip of the pipe. A hose connection port of a plate, an outer plate welded portion that is joined by welding to an edge portion of the pipe drawing hole, an outer fitting portion that is fitted around the pipe drawn out from the pipe drawing hole, and A hose connection port of an outer plate formed by using a metal support cylinder having a pipe tip and a pipe welded portion joined by welding, and fitting the hose around the outer fitting portion. 2. The hose connection port for an outer plate according to claim 1, wherein the outer plate welded portion is an outer edge of a flange portion which covers an outer peripheral edge of the pipe drawing hole. . 3. The hose connection port of the outer plate according to claim 1, wherein the pipe lead-out hole is formed inside a tubular portion provided so as to project the outer plate outward, and the tubular portion is provided with the outer portion. Provided in a tapered shape that spreads outward of the plate, the outer plate welded portion is folded back toward the outer fitting portion side, and is in conformity with the tapered shape of the tubular portion, and is a folded flange portion that abuts the inside of the tubular portion. The hose connection port of the outer plate, which is the outer edge of the. 4. The hose connection port of the outer plate according to claim 1, wherein the outer fitting portion has an annular bulge portion for fixing a hose in the middle. Board hose connection. 5. The hose connection port of the outer plate according to claim 1, wherein the outer plate and the support cylinder are made of stainless steel,
The hose connection of the outer plate, wherein the joint between the outer plate and the support cylinder is welded, the pipe is a copper pipe, and the copper pipe and the support cylinder are welded using a nickel welding rod. mouth. 6. The hose connection port of the outer plate according to claim 4, wherein the support cylinder is press-molded, and the annular bulging portion is formed by beading. 7. The hose connection port of the outer plate according to claim 5, wherein the outer plate of the equipment is a container wall of a refrigerator main body of an absorption refrigerating apparatus, which is an airtight container in which a low-pressure absorbing liquid vapor is contained. The hose connection port of the outer plate, wherein the pipe is a liquid medium circulation pipe for heat exchange. 8. The hose connection port of the outer plate according to claim 1, wherein the outer plate of the device is a cylindrical surface, and the pipe drawing hole is an outer side formed on the outer plate. The hose connection port of the outer plate, which is provided on a bulging flat surface.