JP2006342676A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient, highly reliable and inexpensive hermetic compressor having a suction connecting pipe section structure for accurately cutting off a compression mechanism suction port part and the sealed vessel inside, with an easy constitution, by reducing the number of part items. <P>SOLUTION: A connecting pipe 118 to a suction port of a compression mechanism part 102 is formed of a copper pipe integral mold having a welding part 119 and a guide part 120. This guide part 120 and the suction port of the compression mechanism part 102 are cut off from a space inside of a sealed vessel 101 by being fixing in close contact directly or indirectly via a sealant; and can constitute a suction connecting pipe superior in installation performance, by reducing the number of part items, while restraining adverse influence (thermal strain and the deterioration in the sealant) by heat conduction to the compression mechanism part 102, by sealing, welding and fixing the welding part 119 at the low temperature with an external part of the sealed vessel 101. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used for commercial and home air conditioners (air conditioners), and more particularly to a connecting pipe structure between a hermetic container and a compression mechanism.

  As a conventional hermetic compressor, a hermetic electric vertical rotary compressor and a hermetic electric vertical scroll compressor will be described with reference to the drawings.

  10 and 11 are cross-sectional views showing the internal structure of a conventional hermetic electric vertical rotary compressor. FIGS. 12 and 13 show the internal structure of a conventional hermetic electric vertical scroll compressor. It is sectional drawing. Note that the compression principle of the rotary compressor and scroll compressor is already known, and is omitted here.

  Conventionally, this type of hermetic compressor is provided with a compression mechanism unit 102 and an electric motor unit 103 inside a hermetic container 101. The electric motor unit 103 includes a stator 104 and a rotor 105, and the rotational force generated by the electric motor unit 103 is transmitted to the compression mechanism unit 102 via the crankshaft 106.

  A closed connection pipe 107 for sucking refrigerant gas and a discharge pipe 108 for discharging refrigerant gas compressed by the compression mechanism 102 are attached to the sealed container 101, and when the rotational force is transmitted to the compression mechanism 102, After the low pressure refrigerant is sucked from the suction connection pipe 107 and compressed by the compression mechanism section 102, it is discharged into the sealed container 101, and after passing through the motor section 103 and cooled, discharged from the discharge pipe 108 as high pressure refrigerant, An evaporator (not shown) and a condenser (not shown) are connected by an external connection pipe 109 to constitute a so-called refrigeration cycle.

  As the hermetic container 101 used in such a hermetic compressor, generally, a plate-like iron is formed above and below a cylindrical tube (hereinafter referred to as a shell shell) 110 of an iron-based material (for example, a steel plate material such as SS400). Caps made of a base material (hereinafter referred to as upper shell and lower shell) 111, 112 are circumferentially welded and hermetically fixed. On the other hand, the external connection pipe 109 has pressure resistance and can be easily shaped. In general, copper pipes are used, and the suction connection pipe 107 and the discharge pipe 108 of the compressor are also formed of copper pipes in order to facilitate the joining thereof by brazing with a copper braze 113 or the like. Things are used.

  Here, as described above, the compression mechanism 102 disposed inside the sealed container 101 is connected to the external connection pipe 109 of the sealed container 101 by the suction connection pipe 107, but the inside of the sealed container 101 (high pressure). Therefore, there is a pressure difference between the vicinity of the suction port of the compression mechanism part (low pressure), and in order to improve compression efficiency, it is necessary to improve the sealing performance and reduce leakage.

  Therefore, the structure around the suction connection pipe in the conventional example as shown in FIGS. 10 and 11 has a guide pipe 114 as a separate part and is press-fitted and fixed to the suction port of the compression mechanism section 102 to obtain a sealing property. The outer suction pipe 115 is brazed and fixed to the shell 110 with a silver solder 116 using flux or the like, and the suction connection pipe 107 is inserted into the guide pipe 114, and these three parts are simultaneously attached to the copper solder 113 from the outside. It is configured to be brazed and sealed.

On the other hand, in the case of the conventional examples as shown in FIGS. 12 to 13, there is a concern that the compression efficiency is lowered due to thermal distortion during brazing to the compression mechanism, and at the same time, the guide tube 114 is easily assembled. A ring-shaped cushioning material 117 made of a resin material is incorporated between the suction port of the mechanism portion 102 and a sealing property is obtained. The assembly structure around the suction connection pipe is that the outer shell 115 is attached to the trunk shell 110. Using a flux, the brazing is fixed by the silver row 116, and the suction connecting pipe 107 is inserted into the guide tube 114, and these three parts are simultaneously brazed and sealed by the copper row 110 from the outside. It has become.

Here, by brazing and heating the suction connection pipe, heat is transmitted to each component, and the guide pipe 114 has a thermal conductivity of copper to avoid adverse effects such as thermal distortion on the compression mechanism 102 as much as possible. In order to facilitate the connection (with copper solder 110) to the suction connection pipe 107 made of a copper pipe using a ferrous material lower than the pipe, it is common to use a copper plated one as a separate part. (For example, refer to Patent Document 1 or 2).
Japanese Patent Laid-Open No. 11-013671 (page 6, FIG. 5) JP 2001-153048 A (page 7, FIG. 6)

  However, in the configuration around the hermetic compressor suction connection pipe as in the conventional configuration, the number of parts is large, the assembling property is deteriorated, and the cost is increased.

  In addition, it is difficult to eliminate the distortion caused by the heat conduction to the compression mechanism due to the final copper brazing heating even if the material of the guide tube is considered so as to suppress the heat conduction as much as possible. There is concern about the decline.

  In particular, in the case where a ring-shaped cushioning material made of a resin material is incorporated in the suction port of the compression mechanism section to obtain a sealing property with the guide tube, this heating makes the cushioning material easier to melt, and further improves the compressor efficiency. There are concerns about adverse effects and reduced reliability.

  Moreover, the flux used when the suction outer tube is brazed with silver is easily hydrolyzed, and in particular, the possibility of decomposing refrigerating machine oil is increased, leading to a reduction in the reliability of the compressor.

  The present invention solves all of the above-mentioned multiple problems, and has a high efficiency with a suction connection pipe configuration that reduces the number of parts, has excellent ease of assembly, and suppresses heat conduction and thermal distortion to the compression mechanism. -An object is to provide a highly reliable and inexpensive hermetic compressor.

  In order to solve the above-mentioned conventional problems, the structure around the suction connection pipe of the hermetic compressor according to the present invention is such that the connection pipe to the suction port of the compression mechanism section is made of a copper pipe and the outer diameter of the guide pipe is larger than that. This is a copper tube integrated molded product consisting of a welded tube with the diameter of By obtaining the properties, the space inside the sealed container is blocked, and further, the welded portion end face is welded and fixed to the outside of the sealed container.

  With this configuration, a highly efficient, highly reliable, and inexpensive hermetic compressor with a suction connection pipe configuration that reduces the number of parts, has excellent ease of assembly, and suppresses heat conduction and thermal distortion to the compression mechanism. Can be provided.

  As described above, according to the configuration around the suction connection pipe of the present invention, leakage from the suction port of the compression mechanism portion is suppressed, the number of parts is further reduced, and silver brazing using flux is not performed. It is possible to provide a high-efficiency, high-reliability, and inexpensive hermetic compressor without adverse effects such as thermal distortion caused by high-temperature heating on the compression mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 is an example of a cross-sectional view of a hermetic electric vertical scroll compressor according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the configuration around the suction connection pipe in this embodiment as seen from above. 1 and 2 and the same components as those of the conventional FIGS. 10 to 13 are denoted by the same reference numerals, and the description of the same components as those of the conventional FIGS.

  1 and 2, the suction connection pipe 118 of the present embodiment is a copper pipe integrated molded product having the functions of the suction connection pipe 107 and the guide pipe 114 of the conventional example, and a welded portion 119 formed by beading or the like. The guide portion 120 is processed and formed from the same copper tube through a tube expansion / contraction process.

  In the present embodiment, the structure around the suction connection pipe is as follows. After the compression mechanism portion 102 is assembled to the shell shell 110, the guide portion 120 of the suction connection tube 118 is inserted into the suction port of the compression mechanism portion 102 through a hole provided on the side surface of the shell shell 110. In addition, the high-pressure region inside the sealed container 101 and the low-pressure region inside the suction port are blocked by a ring-shaped cushioning material 117 made of a resin material. Further, as described above, the suction connection pipe 118 is hermetically fixed to the compressor by welding and fixing (for example, diffusion bonding or resistance welding) to the outer side surface of the shell 110 at the welded portion 119.

  Here, since the joining according to the above welding method example is only heating at an ambient temperature of about 40 ° C., according to such a construction method / configuration, the ring-shaped buffer material 117 made of a resin material is thermally affected by heat conduction ( For example, the suction connecting pipe 107 is not heated to be deformed and can be hermetically fixed to the shell 110.

  In this embodiment, a scroll compressor is used as a representative example. However, the present invention is not limited to the compression mechanism, and can be similarly implemented as long as it has a configuration around the suction port of the same hermetic compressor. is there.

  Further, in this embodiment, the case where the suction port of the compression mechanism unit 102 is provided on the side surface of the shell shell 110 by a hermetic vertical compressor is used as a representative example, but the upper shell 111 or the lower shell 112 is used as a representative example. The present invention can be implemented in the same manner even when used in a hermetic horizontal compressor provided with a suction port.

(Embodiment 2)
FIG. 3 is an example of a cross-sectional view of a hermetic electric vertical scroll compressor according to Embodiment 2 of the present invention. FIG. 4 is a cross-sectional view of the suction connection pipe as seen from above. 3 and 4 and the same constituent elements as those of the conventional FIGS. 10 to 13 are denoted by the same reference numerals, and the description of the same constituent elements as those of the conventional FIGS.

  3 and 4, the suction connection pipe 118 is a copper pipe integrated molded product having the functions of the suction connection pipe 107 and the guide pipe 114 of the conventional example, and a welded portion 119 and a guide portion 120 formed by beading or the like. Are processed and formed from the same copper tube through a tube expansion / contraction process.

  In the present embodiment, the structure around the suction connection pipe is as follows. After the compression mechanism portion 102 is assembled to the shell shell 110, the guide portion 120 of the suction connection tube 118 is inserted into the suction port of the compression mechanism portion 102 through a hole provided on the side surface of the shell shell 110. -It is press-fitted, and the welded portion 119 is hermetically fixed to the compressor by welding (for example, diffusion bonding or resistance welding) to the outer side surface of the shell 110.

Here, in the welding method according to the present embodiment, as described above, the suction connection pipe 118 can be fixed in close contact with the shell shell 110 with almost no heating, and the compression mechanism assembled to the shell shell 110 first. In accordance with the position of the suction port of the portion 102, it can be press-fitted in a substantially coaxial state along the guide portion of the suction connection pipe 118 and can be hermetically sealed. Therefore, the sealing performance can be improved by press-fitting and adhesion more than conventional. Furthermore, since almost no thermal strain is generated in the compression mechanism 102, it is also used in the case of the scroll compressor in the present embodiment in which clearance management in the compression mechanism 102 is particularly important in terms of performance and reliability. It is possible.

  In this embodiment, a scroll compressor is used as a representative example. However, the present invention is not limited to the compression mechanism, and can be similarly implemented as long as it has a configuration around the suction port of the same hermetic compressor. is there.

  Further, in this embodiment, the case where the suction port of the compression mechanism unit 102 is provided on the side surface of the shell shell 110 by a hermetic vertical compressor is used as a representative example, but the upper shell 111 or the lower shell 112 is used as a representative example. The present invention can be implemented in the same manner even when used in a hermetic horizontal compressor provided with a suction port.

(Embodiment 3)
FIG. 5 shows an example of the suction connection pipe 118 and the welded portion 119 according to the first or second embodiment when the welded portion 119 has a protruding shape with an acute angle (about 60 °) as shown in the figure. It is.

  By adopting the weld pipe end face shape according to the present embodiment, it is possible to improve weldability by welding and fixing (for example, diffusion bonding or resistance welding) between the welded portion 119 and the shell 110 and to stabilize the sealing and fixing. .

(Embodiment 4)
FIG. 6 is an example when the opposite surface of the welded portion 119 is the inclined surface 121 in the first to third embodiments.

  FIG. 7 is a diagram showing an example of FIG. 6 as viewed from above, and shows an example of assembly by the jig 122. By using the inclined surface provided on the opposite surface of the welded portion and pressing against the shell shell 110 side with the jig 122, the sealing welding described above can be performed more easily and reliably.

(Embodiment 5)
FIGS. 8 and 9 show a sealed electric vertical shaft representing a joining state around the suction connecting pipe when the planar shape portion 123 is provided in the welding surface 119 joining surface range of the side surface of the shell shell 110 in the first to fourth embodiments. It is an example of the cross-sectional view and longitudinal cross-sectional view of a stationary scroll compressor.

  According to the body shell 110 in which the planar shape portion 123 is provided in the range of the welded portion 119 joint surface according to the present embodiment, the welded surface (end surface) of the welded portion 119 can be made flat, so that the welded portion 119 is formed. In addition, since the welding can be fixed by the surface, more stable sealing and fixing can be performed.

  In the present embodiment, the case where the suction port of the compression mechanism portion 102 is provided on the side surface of the shell shell 110 by a hermetic vertical compressor is used as a representative example, but the upper shell 111 or the lower shell 112 is used as a representative example. The present invention can be implemented in the same manner even when used in a hermetic horizontal compressor provided with a suction port.

As described above, the hermetic compressor according to the present invention suppresses leakage from the suction port of the compression mechanism unit, further reduces the number of parts, and without performing silver brazing using a flux, and the compression mechanism unit. It is possible to provide a high-efficiency, high-reliability, and inexpensive hermetic compressor without adverse effects such as heat distortion due to high-temperature heating, so only with refrigeration equipment such as air conditioners and refrigerators. Not applicable to heat pump water heaters.

The longitudinal cross-sectional view of the scroll compressor in Embodiment 1 of this invention 1 is a cross-sectional view of a scroll compressor according to Embodiment 1 of the present invention. The longitudinal cross-sectional view of the scroll compressor in Embodiment 2 of this invention Cross-sectional view of the scroll compressor according to Embodiment 2 of the present invention Sectional drawing of the suction connection pipe and its welding part in Embodiment 3 of this invention Sectional drawing of the suction connection pipe and its welding part in Embodiment 4 of this invention The figure of the assembly | attachment state of the suction connection pipe and welding part in Embodiment 4 of this invention Scroll compressor longitudinal cross-sectional view in trunk shell shape in Embodiment 5 of the present invention Scroll compressor cross-sectional view in the shell shell shape in Embodiment 5 of the present invention Longitudinal section of a conventional rotary compressor Cross section of a conventional rotary compressor Longitudinal sectional view of a conventional scroll compressor Cross-sectional view of a conventional scroll compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 102 Compression mechanism part 103 Electric motor part 104 Stator 105 Rotor 106 Crankshaft 107 Suction connection pipe 108 Discharge pipe 109 External connection pipe 110 Body shell 111 Upper shell 112 Lower shell 113 Copper low 114 Guide pipe 115 Suction outer pipe 116 Silver low 117 Ring-shaped cushioning material 118 Suction connection pipe (integrated shape with guide pipe)
119 Welding portion 120 Guide portion 121 Inclined surface 122 Jig 123 Trunk shell plane shape portion

Claims (5)

In a hermetic compressor composed of a compression mechanism that performs a compression operation via a crankshaft in a hermetic container and an electric motor that drives the compression mechanism, the compression mechanism has a suction port and a discharge port, and sequentially rotates along with the rotation of the crankshaft. It is a structure that performs compression operation by reducing the volume, and the connecting pipe to the suction port of the compression mechanism part is a copper pipe integrated molded product having a welded part with a diameter greater than the outer diameter of the guide part and the guide part. The compression mechanism portion suction port is in close contact with a ring-shaped cushioning material made of a resin material, shut off from the space inside the sealed container, and welded and fixed to the outside of the sealed container at the welded portion, Hermetic compressor. In a hermetic compressor composed of a compression mechanism that performs a compression operation via a crankshaft in a hermetic container and an electric motor that drives the compression mechanism, the compression mechanism has a suction port and a discharge port, and sequentially rotates along with the rotation of the crankshaft. It is a structure that performs compression operation by reducing the volume, and the connecting pipe to the suction port of the compression mechanism part is a copper pipe integrated molded product having a welded part with a diameter greater than the outer diameter of the guide part and the guide part. A hermetic compressor characterized in that the compression mechanism section suction port is press-fitted into close contact with the space inside the sealed container, and is welded and fixed to the outside of the sealed container at the welding section. 3. The hermetic compressor according to claim 1, wherein an acute ring-shaped protrusion is provided in the welded portion and used as a welding start portion. The hermetic compressor according to claim 1, wherein an opposite surface of the welded portion is an inclined surface. The hermetic compressor according to any one of claims 1 to 4, wherein the hermetic container is provided with a flat surface and welded and fixed to the outside of the hermetic container at the welding part.

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