JP2004360476A - Piping connection structure of compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping connection structure of a compressor, in which it is easy to separate materials at recycling, and the volumetric efficiency of the compressor is improved by preventing refrigerant density from lowering owing to the heat of the compressor. <P>SOLUTION: The piping connection structure of the compressor is provided with the compressor compressing a refrigerant, suction piping connected to the compressor and leading the refrigerant, and an accumulator connected to the suction piping and storing the refrigerant. The suction piping, the shell of the compressor, and the shell of the accumulator are made of the same iron material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe connection structure of a hermetic compressor used for a refrigeration / air-conditioning device and the like.
[0002]
[Prior art]
In the conventional connection structure of the hermetic compressor, generally, the purpose of preventing the liquid refrigerant from being sucked into the high-pressure shell of the compressor filled with the refrigerant gas, and also to reduce the refrigerant noise at the time of suction. For the purpose of reduction, an accumulator is provided in the suction-side pipe of the compressor, and the suction-side pipe is inserted above the accumulator by a predetermined length from the bottom thereof, and then sealed.
[0003]
As a result, even if the refrigerant sucked into the compressor from the accumulator is in a refrigerant state with a high liquid fraction, the liquid refrigerant has a large specific gravity, so it is stored at the bottom of the accumulator, and only the gas refrigerant flows upward from the bottom of the accumulator. Is sucked from the suction side pipe extending by a certain height, and is sent to the compressor body.
[0004]
The accumulator at this time was manufactured by joining two steel bowl-shaped cylindrical containers with their open surfaces facing each other, and a copper cooler side pipe from a cooler was inserted and joined to the upper part. In addition, a copper suction pipe is inserted and joined at its lower part, and the material of the suction pipe at this time is the cheapest, can withstand plastic working, and can be brazed without flux. Was used.
[0005]
In addition, when joining the cup-shaped cylindrical containers of the accumulators, since they are made of the same steel, they are joined by arc welding or brazing in a furnace using copper brazing, and a copper suction pipe is used. When it is joined to a steel accumulator or a compressor shell, it is brazed with silver braze or the like because it is a joint of different metals.
[0006]
When joining the suction pipe to the compressor shell, first, insert a straight connecting auxiliary copper pipe into the suction hole of the compressor cylinder to absorb the assembly tolerance and reduce the generation of foreign matter. After pressing a steel ring part into the inside of a copper pipe, or pressing a copper-plated iron pipe into a copper pipe, brazing it with a flux-free phosphor copper braze to the copper pipe joined to the compressor shell Was.
That is, a copper pipe was previously brazed to a shell of a compressor by silver, and then a copper suction pipe and a connection auxiliary copper pipe were brazed to the copper pipe by a phosphor copper braze. (For example, see Patent Document 1)
[0007]
On the other hand, in recent years, from the viewpoint of global environmental protection, the recovery and reuse of resources from waste has been strongly demanded, and the so-called Home Appliance Recycling Law was legally enforced in April 2001. Refrigerators and the like are mentioned, and when these products are disposed of, it has become necessary to recover their component materials as resources.
[0008]
As a result, the hermetic compressors of these products are crushed by a crusher, and the crushed pieces are separated and collected for each material such as iron, copper, and aluminum by a separation means such as a magnetic separator or an eddy current machine. There are also things. (For example, see Patent Document 2)
[0009]
[Patent Document 1]
Japanese Patent Publication No. 7-26628 (page 2-3, FIG. 1)
[Patent Document 2]
JP-A-6-182249 (page 2-5b, FIG. 1)
[0010]
[Problems to be solved by the invention]
As described above, in a conventional hermetic compressor and its reusable one, in order to maintain an airtight structure, a straight copper pipe or a thick-film copper-plated iron pipe is press-fitted into a shell of the compressor. Therefore, since the suction pipe must be joined to the compressor shell with a phosphor copper braze, there has been a problem that the number of parts increases or the pretreatment becomes complicated.
[0011]
Also, when crushing such a hermetic compressor with a crusher, the compressor is crushed into pieces only by deforming the compressor with the copper pipes inside due to the collision of the rotating blades of the crusher and the compressors. However, there is a problem that the separation cannot be performed without the use of a magnetic separation machine or an eddy current machine according to the type of the crushed pieces.
[0012]
The present invention has been made in order to solve the above problems, and has as its object to obtain an economical and reliable compressor pipe connection structure that is easy to join, has little leakage. .
[0013]
It is another object of the present invention to obtain a compressor pipe connection structure having good recyclability.
[0014]
[Means for Solving the Problems]
In the present invention, a compressor pipe comprising: a compressor for compressing a refrigerant; a suction pipe connected to the compressor for guiding the refrigerant; and an accumulator connected to the suction pipe for storing the refrigerant. In the connection structure,
The suction pipe, the compressor shell, and the accumulator shell are made of the same iron-based material.
[0015]
Further, the suction pipe is press-fitted into a suction hole of the compressor cylinder through a shell hole of the compressor, inserted into an iron-based suction auxiliary pipe protruding outward from the shell hole, and hermetically sealed with brazing material. It was brazed.
[0016]
In addition, the suction auxiliary pipe is hermetically brazed to the shell of the compressor simultaneously with the same brazing material when the suction pipe is brazed to the suction auxiliary pipe.
[0017]
Further, the brazing material is formed of a ring-shaped preform brazing material obtained by hardening a flux core containing boric acid as a main component with silver brazing, copper brazing, brass brazing, or the like, and the brazing material is provided on the outer periphery of the shell hole. They are arranged and welded.
[0018]
Further, the suction pipe is press-fitted into a cylinder suction hole of the compressor through a shell hole of the compressor, and has a flange portion which is hermetically welded to a shell of the compressor outside the shell hole. It is inserted into the suction assist pipe and hermetically joined.
[0019]
Further, the shell of the compressor and the flange portion are arc-welded, and the suction auxiliary pipe and the suction pipe are resistance-welded.
[0020]
Further, the suction pipe is inserted into a heat-resistant resin-based seal auxiliary pipe member press-fitted into the suction hole of the compressor cylinder through the shell hole of the compressor, and is airtight brazed to the shell hole of the compressor. It is a thing.
[0021]
Further, when the seal auxiliary pipe member is inserted into the suction hole of the cylinder, one of the seal auxiliary pipe member and the suction hole of the cylinder has a tapered shape so as to suppress the other part at a predetermined position. It is composed.
[0022]
Further, the heat-resistant resin-based seal auxiliary pipe member has a tapered shape such that an inner diameter thereof gradually becomes substantially smaller to an outer diameter dimension of the suction pipe toward the insertion side.
[0023]
Further, the suction pipe is press-fitted and welded into a suction hole of the compressor cylinder through a shell hole of the compressor, and is airtightly brazed to the shell hole of the compressor.
[0024]
In addition, a high-frequency induction heater performs the brazing.
[0025]
The welding material for joining the suction pipe and the suction hole is made of a low melting point brazing material, and the welding material for joining the suction pipe and the shell hole of the compressor is made of a high melting point brazing material. The low melting point brazing material is melted and joined by heating and joining the high melting point brazing material.
[0026]
Further, the suction pipe is press-fitted into a suction hole of the compressor cylinder through a shell hole of the compressor, and hermetically bonded to the shell hole of the compressor with a brazing material.
[0027]
Further, the flange portion is provided near the outside of the portion of the suction pipe where the shell hole is located.
[0028]
Further, the refrigerant is a refrigerant having a high discharge gas temperature, such as carbon dioxide gas or R32.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.
FIG. 1 is a schematic vertical sectional view of a pipe connection structure of the compressor, and FIG. 2 is a detailed structural diagram of a pipe connection portion of the compressor.
[0030]
First, as shown in these figures, as a suction auxiliary pipe 5a which is press-fitted into a suction hole 6a of a cylinder 6 of a compressor via a compressor shell hole 1a, for example, a cold-rolled 1.0 mm-thick cold-rolled pipe is used. A steel plate (equivalent to JIS-SPCC) which is press-formed is used. As the suction pipe 5b inserted into the suction auxiliary pipe 5a, for example, a seamless carbon steel pipe (JIS-STS35) of φ10 mm × t1.0 mm is used. When the suction pipes 5a and 5b are connected to the shell of the compressor, a preform brazing material 9 formed into a ring shape is used to place the suction pipes 5a and 5b on the outer diameter of the suction pipe 5b. The brazing material 9 is heated and melted and fixed.
[0031]
As shown in FIG. 3, the preform brazing material 9 used at this time includes a flux core 11 made of a flux obtained by blending 90% of boric acid and 10% of borax, and a brass covering the exterior of the flux core. The flux core 11 is made of brass 10 (equivalent to JIS-BCU6). The flux core 11 is wound into a wire by brass brazing, and then formed into a ring shape.
[0032]
At this time, the suction pipe 5b made of a steel material is inserted upward from the bottom of the accumulator 2 to a certain height, and then joined with brass brazing or copper brazing.
As a result, since the shell 1, the suction auxiliary pipe 5a, the suction pipe 5b, and the accumulator 2 of the compressor are made of a steel material, the material can be easily separated during recycling.
[0033]
Moreover, since the heat conductivity of the steel material is smaller than that of copper, the heat of the compressor is less likely to be transmitted to the accumulator 2, and the rise in the temperature of the refrigerant is suppressed. Therefore, the volumetric efficiency of the compressor can be improved.
[0034]
Furthermore, when a refrigerant containing R32 as a main component or a refrigerant containing carbon dioxide as a main component, which has recently been used for the purpose of protecting the ozone layer and preventing global warming, is used. Since the heat transfer accompanying the temperature rise of the refrigerant to be performed can be further suppressed, the volumetric efficiency of the compressor can be further improved.
[0035]
After the preform brazing material 9 is arranged in the suction auxiliary pipe 5a and the suction pipe 5b as shown in FIG. 3, these components and the brazing material are put into a high-frequency induction heater and heated. Since the material is melted and the suction auxiliary pipe 5a and the suction pipe 5b are simultaneously bonded to the shell 1, the bonding process is simplified.
Moreover, at this time, since the preform 9 contains the flux, the step of applying the flux is not required.
[0036]
At the time of this joining, the joining end of the compressor shell 1 and the suction auxiliary pipe 5a are overlapped with each other so that the electromagnetic wave from the high-frequency induction heater is not electromagnetically shielded by the peripheral parts at the joining portion. As described above, the shell hole 1a is burred so that a step is formed, and the tip of the suction assist pipe 5a is made to protrude from the tip of the burring, and the step is arranged so as to face the high-frequency coil. In addition, the structure is such that the electromagnetic wave from the high-frequency induction heater is not electromagnetically shielded by the peripheral components and the joint is uniformly heated.
[0037]
In this case, since the joining temperature is made uniform and the joining can be performed without unevenness, a highly reliable pipe connection structure of the compressor in which refrigerant leakage is prevented can be realized.
[0038]
In addition, during this heating, the object to be heated is heated by the Joule heat of the electromagnetic wave from the high-frequency induction heater, so that simultaneous heating of dissimilar metals of copper and iron results in unbalanced heat generation efficiency, and the respective temperatures become unbalanced. Since the temperature difference is generated between the joined parts because it becomes uniform, it takes time to eliminate the temperature difference. On the other hand, the compressor shell 1, the suction auxiliary pipe 5a, the suction pipe 5b, and the accumulator 2 are made of a steel material. If they are unified, the heating and brazing work can be completed in a short time.
As a result, even if the steel pipe unit price is higher than the copper pipe, a low-cost compressor pipe connection structure can be obtained in consideration of the brazing time and the brazing material unit price.
[0039]
In the above description, the preform brazing material having the core material of the flux core is used to be laid, and the high-frequency induction heating machine is used to heat the preform brazing material. Good, or torch heating using gas flux and solid brazing material.
In addition, a brazing material for externally applying a flux may be used depending on the degree of handling before and after the joining operation.
[0040]
In addition, when brazing by high-frequency induction heating in the form of a brazing filler metal with a flux core, if the brazing material itself is brass brazing, copper brazing, or silver brazing, the electric resistance is smaller than that of iron-based piping material. In addition, since the temperature rise of the brazing material during energization is small and almost no flux burnout is observed, a good brazing operation can be performed.
[0041]
In addition, even when the torch is heated using a gas flux and brazed with a solid brazing material, since all objects to be heated are iron-based materials, problems such as melting of the base material are unlikely to occur and high reliability is obtained. Joining can be realized.
[0042]
However, such a joining operation is a relatively complicated operation, and the thermal mass balance in the vicinity of the joining portion tends to be biased. Therefore, in a compressor using a copper suction pipe, the suction pipe is easily melted. Therefore, it is not suitable for copper-based piping materials because the yield is significantly reduced.
Furthermore, when a flux containing boric acid as a main component is used, the activation temperature is very high, and generally exceeds 800 ° C., so that the joining operation is performed at a temperature very close to the melting point of copper of about 1083 ° C. This is not suitable for copper piping materials.
[0043]
At this time, if a copper-based piping material is used, a brazing material that is activated at a relatively low heating temperature (500 to 700 ° C.), for example, a low-melting silver braze, and a flux of chlorine or fluorine is used. Since it is necessary to use one that contains active components such as the above, it is not possible to avoid the corrosion of metal parts and the occurrence of adverse chemical effects on the refrigerant and refrigeration oil in the refrigeration circuit. It is better to use materials.
[0044]
In addition, since high-frequency induction heating can be used to heat only the parts that require more heat than torch heating, high-frequency induction heating can be used for precision assembly parts where the effects of heat during joining cannot be ignored. Is desirable.
[0045]
Although FIGS. 2 and 3 show an example in which the connecting portion of the shell 1 is joined by burring, depending on the accuracy of the clearance between the shell 1 and the suction auxiliary pipe 5a, burring is not always necessary. good.
[0046]
Embodiment 2 FIG.
Embodiment 2 will be described with reference to FIG.
FIG. 4 is a schematic configuration diagram of a joint portion when a flange portion is provided in each of the suction auxiliary pipe 5a and the suction pipe 5b. As shown in this figure, the shell hole 1a of the compressor shell 1 is The iron suction auxiliary pipe 5a is press-fitted into a cylinder suction hole of the compressor through a flange, has a flange part, and is fixed to the compressor shell 1 by MAG welding through the flange part. And a suction pipe 5b that is inserted and hermetically connected by resistance welding and guides the refrigerant from the accumulator. The suction pipe 5b guides the refrigerant in the accumulator 2 to the compressor.
[0047]
That is, first, in the first step, the suction auxiliary pipe 5a is inserted through the shell hole 1a of the compressor 1, and the flange portion of the inserted suction auxiliary pipe 5a is brought into contact with the compressor shell 1; This flange portion is hermetically welded to the compressor shell 1 by MAG welding.
[0048]
In the next second step, the suction pipe 5b is inserted into the welded suction auxiliary pipe 5a, and the suction pipe 5b is joined by resistance welding.
At this time, as in the first embodiment, a cold-rolled steel plate having a thickness of 1.0 mm press-formed is used as the suction auxiliary pipe 5a, and the suction pipe 5b is φ10 mm × t0.7 mm. Bending of a steel tube (single Fulton tube) and processing of the insertion end.
[0049]
Furthermore, when the compressor shell 1 and the flange portion of the suction pipe 5a are joined by the above-described MAG welding, welding is performed using 20% carbon dioxide-argon as a shielding gas and a solid wire as a filler rod. Since there is a possibility that spatter will occur and this spatter may enter the pipe, a cap is placed on the insertion opening of the suction auxiliary pipe 5a into which the suction pipe 5a is inserted so as not to enter.
[0050]
In the above description, MAG welding, which is one type of arc welding, was used. However, instead of this MAG welding, MIG welding of arc welding was used, and at this time, inert gas was used as argon or helium, and as a filler rod. If a brass or copper-silicon filler rod is used, sealing joining can be performed without melting the base material, so that spatter generation can be reduced.
Also, at this time, if a small amount of a reducing gas such as hydrogen is blended with the inert gas, the occurrence of spatter can be prevented, so that the bonding can be performed without a metal cap.
[0051]
Further, as shown in FIG. 4, since a flat flange surface and a cylindrical shell side surface are joined, a gap is generated in the joint surface. Therefore, welding using a filler rod is performed. If the joining surface is made substantially flat, TIG or plasma welding, which is one of arc welding, may be used.
[0052]
In the second step, when the suction auxiliary pipe 5a and the suction pipe 5b are resistance-welded to each other, the cylinder of the suction auxiliary pipe 5a is pressed while pressing the end of the bulge-processed flange of the suction pipe 5b. After press-fitting into the inside, welding was performed by applying a current, but even during this welding, welding spatter may be generated.To prevent this, an inert gas such as helium is introduced into the suction pipe. If welding is performed while flowing, spatter is less likely to be generated, and good welding connection can be performed.
[0053]
Embodiment 3 FIG.
The third embodiment will be described with reference to FIG.
FIG. 5 shows a schematic structure in which the suction pipe 5 is inserted into the resin-based seal auxiliary pipe member 14 press-fitted into the suction hole 6a of the compressor cylinder 6, and the suction pipe 5b is hermetically joined to the compressor shell 1. As shown in this figure, instead of the iron-based suction auxiliary pipe 5a in the first or second embodiment, a resin-based seal auxiliary pipe member 14 is connected to the suction hole of the compressor cylinder 6 through the shell hole 1a. 6a, the suction pipe 5b is inserted into the resin-based seal auxiliary pipe member 14 through the compressor shell hole 1a, and then the preform solder is formed around the vicinity of the compressor shell hole of the inserted suction pipe 5b. The preform solder 9 is melted by a high-frequency induction heater or the like to join the compressor shell 1 and the suction pipe 5b.
[0054]
Since the above-mentioned resin-based seal auxiliary piping member 14 is soft, it absorbs errors caused by assembly tolerances and suppresses refrigerant leakage. However, this soft resin-based material has heat during welding (around 100 ° C.). Therefore, it is necessary to select a material having good compatibility because the material undergoes thermal deformation or thermal deterioration, or swells by reacting with a refrigerant or a lubricating oil, thereby causing a chemical change.
[0055]
Therefore, in order to satisfy these conditions, tetrafluoroethylene (PTFE) or the like, which is a soft material with good compatibility, has heat resistance of about 100 ° C. or more, and satisfies the conditions of refrigerant resistance and refrigerating machine oil resistance. The material of the seal auxiliary piping member 14 was used.
Examples of these alternative materials include Teflon (R) resins such as FEP, resins such as PET and PA, rubbers such as HNBR and Viton, Teflon (R) elastomers, and bulker tape. Etc. are also conceivable.
[0056]
At this time, the outside diameter of the heat-resistant resin-based seal auxiliary pipe member 14 on the insertion side is made smaller than the inside diameter of the suction hole of the cylinder 6, and the suction hole of the cylinder 6 is gradually moved toward the insertion side. When the tapered shape is made larger than the inner diameter and the tapered seal auxiliary pipe member 14 is press-fitted into the suction hole of the cylinder 6, further sealing performance can be ensured, and vibration and pressure during operation can be improved. The displacement caused by the difference can be prevented.
At this time, the same is true even if the suction auxiliary pipe member 14 is not tapered but the suction hole side of the cylinder 6 is tapered.
[0057]
Further, at this time, if the inner diameter of the heat-resistant resin-based seal auxiliary pipe member 14 is tapered so as to gradually decrease to the outer diameter of the suction pipe toward the insertion side, the overall sealing performance is further improved. Can be secured, and the displacement caused by vibration or pressure difference during operation can be further prevented.
[0058]
As described above, in the third embodiment, instead of the iron-based suction auxiliary pipe 5a, the resin-based seal auxiliary pipe member 14 is used, and the suction pipe 5b is press-fitted into the auxiliary pipe member 14, and this suction is performed. Since the pipe 5b is joined to the compressor shell hole 1a, it can be joined only by welding the suction pipe 5b and the compressor shell hole 1a. Therefore, the form of brazing welding is simplified, and the reliability of joining is improved. The performance is further improved and the cost can be significantly reduced.
[0059]
Embodiment 4 FIG.
Embodiment 4 will be described with reference to FIG.
FIG. 6 is a schematic pipe connection structure diagram of a compressor according to the fourth embodiment. As shown in FIG. 6, the suction pipe 5b is directly connected to the compressor cylinder 6 without using the suction auxiliary pipe 5a. It is inserted into the hole through the shell hole 1a, and the inserted suction pipe 5b and the suction hole of the cylinder 6 are joined with a brazing material.
[0060]
As the brazing material on the cylinder side at this time, a Nocolok flux was used as a core, and a low melting point Al-Si-based brazing material was wound around the core, and the preform brazing material having a wire diameter of, for example, about 0.8 mm. 9, and it is arranged in a double winding at the joint of the cylinder side suction pipe, and the brazing material for connecting the suction pipe 5b and the shell 1 is boric acid as in the first embodiment. A brass braze 10 is wound around a flux core 11 mainly composed of, and a preform braze 9 having a wire diameter of, for example, about 2 mm is formed into a single winding around a welding portion of a shell-side suction pipe. Is heated and joined by a high-frequency induction heater.
[0061]
The liquidus temperature of the double-wound low-melting brazing material Al-Si brazing material is about 580 ° C, and the liquidus temperature of brass brazing material as the high-melting brazing material is about 900 ° C. Therefore, if the brazing solder having a high melting point is heated to the melting temperature, the brazing solder having a low melting point is also melted, so that the brazing is performed at the same time.
[0062]
In addition, at this time, as a low melting point brazing flux, a Nocoloc flux having good wettability with an iron-based material is used, so that sufficient sealing performance can be ensured, and the Nocoloc flux remains in the compressor. However, since this flux is not corrosive and has no chemical effect on the refrigerant or the refrigerating machine oil, a safe and stable post-weld state can be obtained.
[0063]
In place of the low melting point brazing filler metal Al-Si brazing filler metal, the solidus temperature is 200 ° C or more and the liquidus temperature is 700 ° C in consideration of the actual operating temperature of the compressor (about 180 ° C). Hereinafter, in other words, any brazing material may be used as long as the temperature is equal to or lower than the liquidus temperature of the high melting point brazing material.
[0064]
Embodiment 5 FIG.
The fifth embodiment will be described with reference to FIG.
FIG. 7 is a schematic pipe connection structure diagram of a compressor in the fifth embodiment. As shown in FIG. 7, a suction pipe 5b is provided with a flange, and the suction pipe 5b is pressed by pressing the flange. The preform 9 is press-fitted into the suction hole of the cylinder 6 of the compressor through the shell hole 1a, and the preform 9 in which brass braze is hardened on the flux core 11 is placed between the press-fitted suction pipe and the shell hole 1a. 9 is heated by a high-frequency induction heater to join the suction pipe 5b to the shell 1.
[0065]
In this case, the number of connecting parts can be significantly reduced, and since there is only one joint, the manufacturing is rationalized, the cost is reduced by simplification, and the reliability of the seal is improved. A pipe connection structure of a compressor to be realized can be realized.
[0066]
Further, in the above description, a flange portion is provided in the suction pipe, and press-fitting can be performed by pressing this flange portion. However, if the pipe structure can press-fit the suction pipe, it is not necessary to provide a flange portion. As a result, a pipe connection structure for the compressor can be obtained at a lower cost with improved seal reliability.
[0067]
In Embodiments 1 to 5 described above, the joining between the iron-based suction pipe and the accumulator was not described because joining can be performed by an extremely general joining method such as brazing or welding. is there.
[0068]
In addition, the pipe connection structure of the compressor according to the first to fifth embodiments is particularly advantageous when the refrigerant discharge gas temperature is about 30 ° C. higher than that of R-410, for example, when a refrigerant such as carbon dioxide gas or R32 is used. Since the heat of the discharge gas temperature is less likely to be transmitted from the compressor shell to the suction refrigerant via the suction pipe, a rise in the suction refrigerant temperature can be suppressed, and a decrease in the refrigerant density can be prevented, so that the volumetric efficiency of the compressor can be improved. .
[0069]
【The invention's effect】
As described above, in the present invention, a compressor that compresses a refrigerant, a suction pipe connected to the compressor and guiding the refrigerant, and an accumulator connected to the suction pipe and storing the refrigerant, In the piping connection structure of the compressor equipped,
Since the suction pipe, the compressor shell, and the accumulator shell are made of the same iron-based material, the materials are unified, so that the material can be easily separated during recycling, and the heat conductivity is small, so that the compression Since a rise in the temperature of the refrigerant due to the heat of the compressor is suppressed, a decrease in the refrigerant density can be prevented, and a pipe connection structure of the compressor that improves the volumetric efficiency of the compressor can be obtained.
[0070]
Further, the suction pipe is press-fitted into a suction hole of the compressor cylinder through a shell hole of the compressor, inserted into an iron-based suction auxiliary pipe protruding outward from the shell hole, and hermetically sealed with brazing material. Since the brazing is performed, the temperature of the welded joint is made uniform, and the joint can be made evenly, so that a highly reliable pipe connection structure of the compressor that prevents refrigerant leakage can be obtained.
[0071]
Further, when the suction pipe is brazed to the suction pipe, the suction pipe is simultaneously airtightly brazed to the shell of the compressor with a brazing material, thereby simplifying a welding process. Thus, an economical compressor pipe connection structure is obtained.
[0072]
Further, the brazing material is formed of a ring-shaped preform brazing material obtained by hardening a flux core containing boric acid as a main component with silver brazing, copper brazing, brass brazing, or the like, and the brazing material is provided on the outer periphery of the shell hole. Since it is placed and welded, the activation temperature is extremely high, and a highly reliable compressor piping structure that avoids corrosion of metal parts and chemical adverse effects on the refrigerant and refrigeration oil in the refrigeration circuit is obtained. Can be
[0073]
Further, the suction pipe is press-fitted into a cylinder suction hole of the compressor through a shell hole of the compressor, and has a flange portion which is hermetically welded to a shell of the compressor outside the shell hole. Since it is inserted into the auxiliary suction pipe and joined in an airtight manner, it is possible to obtain a highly reliable pipe connection structure of the compressor in which leakage of the refrigerant is prevented.
[0074]
Further, since the shell of the compressor and the flange portion are arc-welded and the suction auxiliary pipe and the suction pipe are resistance-welded, a pipe connection structure of the compressor which is easier to join can be obtained.
[0075]
Further, the suction pipe is inserted into a heat-resistant resin-based seal auxiliary pipe member press-fitted into the suction hole of the compressor cylinder through the shell hole of the compressor, and is airtight brazed to the shell hole of the compressor. Therefore, the welding process is simplified, and the assembly error can be absorbed to prevent the refrigerant from leaking, so that an economical and highly reliable pipe connection structure of the compressor can be obtained.
[0076]
Further, when the seal auxiliary pipe member is inserted into the suction hole of the cylinder, one of the seal auxiliary pipe member and the suction hole of the cylinder has a tapered shape so as to suppress the other part at a predetermined position. With this configuration, the sealing performance can be ensured, and the displacement caused by vibration and pressure difference during operation can be prevented, so that a highly reliable pipe connection structure of the compressor can be obtained.
[0077]
In addition, since the inner diameter of the heat-resistant resin-based seal auxiliary pipe member is tapered so as to gradually decrease to the outer diameter of the suction pipe toward the insertion side, the overall sealing performance is further improved. As well as the displacement caused by vibration and pressure difference during operation can be prevented, a highly reliable compressor pipe connection structure can be obtained.
[0078]
Further, since the suction pipe is press-fitted and welded into the suction hole of the compressor cylinder through the shell hole of the compressor and brazed airtight to the shell hole of the compressor, the suction pipe directly sucks the cylinder. Since the connection is made to the holes, a pipe connection structure of the compressor having few parts and welding work steps can be obtained.
[0079]
The welding material for joining the suction pipe and the suction hole is made of a low melting point brazing material, and the welding material for joining the suction pipe and the shell hole of the compressor is made of a high melting point brazing material. Since the low melting point brazing material is melted and joined by heating and joining the high melting point brazing material, the welding process is simplified and an economical pipe connection structure of the compressor is obtained.
[0080]
Further, since the suction pipe is press-fitted into the suction hole of the compressor cylinder through the shell hole of the compressor and hermetically bonded to the shell hole of the compressor with a brazing material, the parts and the welding work process are further performed. Thus, a compressor pipe connection structure with less pressure can be obtained.
[0081]
Further, since the high-frequency induction heater performs the brazing, only the brazing portion is heated uniformly and at a high speed, so that a highly reliable pipe connection structure of the compressor can be obtained.
[0082]
Further, since the flange portion is provided near the outside of the portion where the shell hole of the suction pipe is located, the work of press-fitting the suction pipe becomes easy, so that the pipe connection structure of the compressor which is easy to assemble is provided. can get.
[0083]
Further, since the refrigerant is a refrigerant having a high discharge gas temperature such as carbon dioxide gas or R32, it is particularly difficult for heat of the discharge gas temperature of the compressor to be transmitted from the compressor shell to the suction refrigerant via the suction pipe. Therefore, a rise in the temperature of the suction refrigerant can be suppressed, and a decrease in the refrigerant density can be prevented, so that a pipe connection structure of the compressor that improves the volumetric efficiency of the compressor can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a pipe connection structure of a compressor according to Embodiment 1 of the present invention.
FIG. 2 is a detailed view of a pipe connection part of the compressor according to the first embodiment of the present invention.
FIG. 3 is a detailed view of the compressor according to Embodiment 1 of the present invention when a step is provided at a pipe connection portion.
FIG. 4 is a schematic longitudinal sectional view of a pipe connection structure of a compressor according to a second embodiment of the present invention.
FIG. 5 is a schematic longitudinal sectional view of a pipe connection structure of a compressor according to Embodiment 3 of the present invention.
FIG. 6 is a schematic longitudinal sectional view of a pipe connection structure of a compressor according to Embodiment 4 of the present invention.
FIG. 7 is a schematic longitudinal sectional view of a pipe connection structure of a compressor according to a fifth embodiment of the present invention.
[Explanation of symbols]
1 compressor shell, 1a shell hole, 2 accumulator, 2a accumulator hole, 3 discharge pipe, 4 accumulator suction pipe, 5a suction auxiliary pipe, 5b suction pipe, 6 cylinder, 6a cylinder suction hole, 9 preform, 10 wax, 11 Flux core, 12 MAG weld, 13 Resistance weld, 14 Seal auxiliary piping member, 15 Low melting point brazing material, 16 High melting point brazing material.

Claims (15)

In a compressor pipe connection structure including a compressor that compresses a refrigerant, a suction pipe connected to the compressor and guiding the refrigerant, and an accumulator connected to the suction pipe and storing the refrigerant,
A pipe connection structure for a compressor, wherein the suction pipe, the compressor shell, and the accumulator shell are made of the same iron-based material. The suction pipe is press-fitted into a suction hole of the compressor cylinder via a shell hole of the compressor, inserted into an iron-based suction auxiliary pipe protruding outward from the shell hole, and hermetically brazed with a brazing material. The pipe connection structure for a compressor according to claim 1, wherein The compressor according to claim 1, wherein the suction auxiliary pipe is hermetically brazed to the shell of the compressor simultaneously with the same brazing material when the suction pipe is brazed to the suction auxiliary pipe. Piping connection structure. The brazing material is a ring-shaped preform brazing material obtained by hardening a flux core mainly composed of boric acid with silver brazing or copper brazing or brass brazing or the like, and disposing the brazing material on the outer periphery of the shell hole. The pipe connection structure for a compressor according to claim 2, wherein the pipe connection is performed by welding. An iron-based suction assist having a flange portion which is press-fitted into a cylinder suction hole of the compressor through a shell hole of the compressor through a shell hole of the compressor and which is hermetically welded to a shell of the compressor outside the shell hole; The pipe connection structure for a compressor according to claim 1, wherein the pipe connection is hermetically welded by being inserted into a pipe. The pipe connection structure for a compressor according to claim 5, wherein the shell of the compressor and the flange portion are arc-welded, and the suction auxiliary pipe and the suction pipe are resistance-welded. The suction pipe is inserted into a heat-resistant resin-based seal auxiliary pipe member press-fitted into a suction hole of the compressor cylinder via a shell hole of the compressor, and is airtight brazed to a shell hole of the compressor. The pipe connection structure for a compressor according to claim 1, wherein: When the seal auxiliary pipe member is inserted into the suction hole of the cylinder, one of the seal auxiliary pipe member and the suction hole of the cylinder is formed in a tapered shape so as to suppress the other part at a predetermined position. The pipe connection structure for a compressor according to claim 7, wherein: 9. The tapered shape according to claim 8, wherein the inner diameter of the heat-resistant resin-based seal auxiliary pipe member gradually becomes smaller toward the outer diameter of the suction pipe toward the insertion side. Compressor piping connection structure. 2. The compressor according to claim 1, wherein the suction pipe is press-fitted and welded into a suction hole of the compressor cylinder via a shell hole of the compressor, and is air-tightly brazed to the shell hole of the compressor. 3. Compressor piping connection structure. The welding material for joining the suction pipe and the suction hole is made of a low melting point brazing material, and the welding material for joining the suction pipe and the shell hole of the compressor is made of a high melting point brazing material. The pipe connection structure for a compressor according to claim 10, wherein the low melting point brazing material is melted and joined by heating and joining the brazing material. 2. The suction pipe according to claim 1, wherein the suction pipe is press-fitted into a suction hole of the compressor cylinder through a shell hole of the compressor, and hermetically joined to the shell hole of the compressor with a brazing filler metal. 3. Compressor piping connection structure. The piping connection structure for a compressor according to any one of claims 2 to 4 or 7 to 11, wherein a high-frequency induction heater performs the brazing. The pipe connection structure for a compressor according to claim 12, wherein the flange portion is provided near an outside of a portion of the suction pipe where the shell hole is located. The pipe connection structure for a compressor according to any one of claims 1 to 13, wherein the refrigerant is a refrigerant having a high discharge gas temperature, such as carbon dioxide or R32.

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