JP4356568B2 - Hermetic compressor - Google Patents

Description

  The present invention relates to a hermetic compressor used for commercial and household air conditioners (air conditioners), and more particularly to a hermetic container, a compression mechanism, and an external connection pipe structure.

  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.

  FIGS. 10 and 11 are a cross-sectional view and a vertical cross-sectional view of a compression mechanism portion showing an internal structure of a conventional hermetic electric vertical rotary compressor, and FIGS. 12 and 13 are conventional hermetic electric vertical scrolls. It is the compression mechanism part cross-sectional view showing the internal structure of a compressor, and a compressor longitudinal cross-sectional view. Note that the compression principle of the rotary compressor and scroll compressor is already known, and is omitted here.

  Conventionally, in this type of hermetic compressor, a compression mechanism unit 102 (a portion in the wavy line range) and an electric motor unit 103 (a portion in the wavy line range) are installed inside the 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 to perform a compression operation.

  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 often 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, in the configuration around the suction connection pipe in the conventional example as shown in FIG. 10 and FIG. 11, the guide pipe 114 is provided as a separate part, and the sealing performance is obtained by tightly fixing the suction pipe to the suction port of the compression mechanism 102. The outer shell 115 is fixed to the shell 110 by brazing with a silver solder 116 using flux or the like, and the suction connecting pipe 107 is inserted into the guide pipe 114. These three parts are simultaneously connected to the copper shell from the outside. 113 is brazed and hermetically fixed.

  On the other hand, in the case of the conventional example as shown in FIG. 12 and FIG. 13, in order to facilitate the assembly of the guide tube 114, at the same time, there is a concern about a decrease in compression efficiency due to thermal distortion during brazing to the compression mechanism. A ring-shaped cushioning material 117 made of a resin material is incorporated between the suction port of the compression mechanism portion 102 and a sealing property is obtained. The assembly structure around the suction connection pipe is the trunk shell 110 and the suction outer pipe 115. Is soldered with a silver solder 116 using a flux or the like, and the suction connecting pipe 107 is inserted into the guide pipe 114, and these three parts are simultaneously soldered and sealed with a copper solder 113 from the outside. It has a configuration.

Here, the guide pipe 114 is made of an iron-based material in order to avoid the adverse effects such as thermal distortion on the compression mechanism 102 as much as possible by transferring the heat between the components by brazing and heating the suction connection pipe. In addition, it has been common to use a copper-plated one as a separate part (see, for example, Patent Documents 1 and 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, since the number of parts is large and the configuration is complicated, the assembling property is deteriorated and the cost is increased.

  Further, as described above, when a copper-plated product of an iron-based material is used for the guide tube, parts having many adverse effects on workability and environmental problems are used.

  In addition, in order to suppress heat conduction as much as possible, considering the material of the guide tube as described above, it is very difficult to completely eliminate the thermal distortion due to heat conduction to the compression mechanism due to the final copper brazing heating. As a result, it becomes a factor of quality deterioration such as an adverse effect on compressor efficiency and a decrease in reliability. Specifically, in the case where a ring-shaped cushioning material made of a resin material is incorporated in the suction port of the compression mechanism portion to obtain a sealing property with the guide tube, there is a concern that the cushioning material is likely to be melted by heating. In the case of a structure that obtains a sealing property by press-fitting adhesion or the like, since thermal distortion due to heating is easily transmitted directly to the compression mechanism part, there is a concern about quality deterioration such as an adverse effect on compressor efficiency and a decrease in reliability. .

  On the other hand, the flux used when the outer shell is brazed with silver is easily hydrolyzed, and in particular, the possibility of decomposing refrigerating machine oil is increased, which leads to a decrease in the reliability of the compressor. It is necessary to reduce use in terms of environmental load.

  The present invention solves all of the above-mentioned multiple problems, is excellent in assembling, reducing the number of parts, eliminating heat conduction and thermal distortion to the compression mechanism, and environmentally good. An object of the present invention is to provide a high-performance, reliable and inexpensive hermetic compressor having a suction connection pipe configuration.

  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. The guide tube and the compression mechanism section suction port incorporate a ring-shaped cushioning material made of a resin material to obtain a sealing property or press fit. By obtaining a sealing property, the space inside the sealed container is shut off, and the welded tube is welded and fixed to the outside of the sealed container.

  With this configuration, the number of parts is reduced, the assembly is easy, the suction connection pipe configuration with reduced heat conduction and thermal distortion to the compression mechanism is possible, and an inexpensive hermetic compressor 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 section 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 and 2 are an example of a transverse sectional view and a longitudinal sectional view of a hermetic electric vertical scroll compressor according to Embodiment 1 of the present invention. The same reference numerals are used for the same components as those of FIGS. 1 and 2 and the conventional FIGS. .

  In FIG. 1 and FIG. 2, the suction connection pipe 118 is a copper pipe molded product in which the shapes of the suction connection pipe 107 and the guide pipe 114 in the conventional example are combined. Has been.

  The structure around the suction connection pipe in the present embodiment is that after the compression mechanism portion 102 is assembled to the shell shell 110, the guide portion of the suction connection tube 118 is inserted into the suction port of the compression mechanism portion 102 through the 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 buffer material 117 made of a resin material. Further, as described above, the suction connection pipe 107 and the welding pipe 119 are previously brazed and integrated with the copper solder 113, and the welding pipe 119 is welded to the outer side surface of the shell 110 (for example, diffusion welding or resistance welding). This is hermetically fixed to the compressor.

  Here, since the joining by welding fixing is only heating at an ambient temperature of about 40 ° C., according to such a configuration, the ring-shaped cushioning material 117 made of a resin material is thermally affected (for example, melted by heat conduction). ) And without being heated such that the suction connecting pipe 107 is deformed, it can be tightly fixed to the trunk 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)
3 and 4 are an example of a transverse sectional view and a longitudinal sectional view of a hermetic electric vertical scroll compressor according to Embodiment 2 of the present invention. 3 and 4, and the same components as those in FIGS. 10, 11, 12, and 13 are denoted by the same reference numerals, and the description of the same components as those in FIGS. 10, 11, 12, and 13 is omitted. .

  3 and 4, the suction connection pipe 118 is a copper pipe molded product in which the shapes of the suction connection pipe 107 and the guide pipe 114 of the conventional example are combined, and a welding pipe 119 is brazed and fixed to the outer periphery with a copper solder 113. Has been.

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

  Here, the joining by the above-mentioned welding fixing can be fixed to the shell shell 110 with almost no heating of the suction connection pipe 118 as described above, and the compression mechanism portion 102 assembled to the shell shell 110 first. In accordance with the position of the suction port, it is possible to press-fit and fix the suction connection pipe 118 along the guide portion, so that the sealing performance can be improved by press-fit adhesion more than conventional. Furthermore, since the thermal distortion to the compression mechanism 102 hardly occurs, it can be used for a scroll compressor as in the present embodiment.

  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 welding pipe 119 according to the first or second embodiment when the welding pipe 119 has a protruding shape with an acute angle (about 60 °) as shown in the drawing. It is. Here, as described above, the suction connection pipe 118 and the welding pipe 119 are integrated by brazing with the copper solder 113 in advance.

  By adopting the weld pipe end face shape according to the present embodiment, it is easy to perform welding and fixing (for example, diffusion welding or resistance welding) between the weld pipe 119 and the shell 110, and it is possible to stabilize the adhesion.

(Embodiment 4)
FIG. 6 is an example of the case where, in the first to third embodiments, the weld pipe 119 has an expanded inner diameter on the weld joint surface side and an inclined surface (about 45 °) is provided on the outer peripheral side. Here, as described above, the suction connection pipe 118 and the welding pipe 119 are integrated by brazing with the copper solder 113 in advance.

  Further, FIG. 7 is a diagram showing an example when FIG. 6 is viewed from above, and shows an example of assembly by the jig 120. By using the inclined surface provided on the outer periphery of the welded tube 119 and pressing it against the shell shell 110 side with the jig 120, the above-described welding can be performed more easily and reliably.

  On the other hand, the outer pipe shape of the welded pipe according to the present embodiment makes it possible to increase the diameter of the hole for inserting the suction connection pipe provided in the shell shell 110, thereby compressing the compression mechanism portion 102 to the shell shell 110. Assembling tolerance can be relaxed, and assembling can be facilitated.

(Embodiment 5)
FIG. 8 is a diagram illustrating a joining state around the suction connecting pipe when the planar shape portion 121 is provided in the joint surface range of the welded pipe 119 on the side surface of the shell shell 110 in the first to fourth embodiments.

  According to the trunk shell 110 provided with the planar shape portion 121 in the range of the welding surface of the welded tube 119 according to the present embodiment, the welded surface (end surface) of the welded tube 119 can be made flat. The molding can be facilitated, and further, the welding can be fixed by the surface, so that 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, etc. It is possible to provide a high-efficiency, high-reliability, and inexpensive hermetic compressor without adverse effects such as thermal distortion due to high-temperature heating. In addition, it can be applied to a heat pump type hot water supply apparatus.

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 1 of this invention Cross-sectional view of the scroll compressor according to Embodiment 2 of the present invention The longitudinal cross-sectional view of the scroll compressor in Embodiment 2 of this invention Sectional drawing of the suction connection pipe and welding pipe in Embodiment 3 of this invention Sectional drawing of the suction connection pipe and welding pipe in Embodiment 4 of this invention The figure which shows the assembly | attachment state of the suction connection pipe and the welding pipe in Embodiment 4 of this invention Scroll compressor cross-sectional view in the shell shell shape in Embodiment 5 of the present invention Scroll compressor longitudinal cross-sectional view in trunk shell shape in Embodiment 5 of the present invention Cross section of a conventional rotary compressor Longitudinal section of a conventional rotary compressor Cross-sectional view of a conventional scroll compressor Longitudinal 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 tube 120 Jig 121 Body shell plane shape part

Claims (2)

In a hermetic compressor in which a compression mechanism that performs a compression operation via a crankshaft and an electric motor that drives the compression mechanism are housed in a hermetic container , the compression mechanism has a suction port and a discharge port. in the structure for performing compression operation by sequentially volume reduction with the rotation, the connecting pipe to the compression mechanism unit inlet port, and a welding pipe having a diameter equal to or greater than the outer diameter of the guide tube and the guide tube made of copper tube anti compression Consists of an integral part brazed on the mechanism suction port side, and the guide tube and the compression mechanism suction port are in close contact with each other via a ring-shaped cushioning material made of a resin material, and the space inside the sealed container and the compression mechanism The welded pipe has an outer diameter expanding section on the compression mechanism section side, and the outer diameter expanding section and the non-expanded section are connected by an inclined inclined surface, and the outer diameter expanding section The end formed on the compression mechanism part side of the part is formed on the outer periphery of the sealed container Characterized in that it is fixed to the plane portion by resistance welding or diffusion welding, a hermetic compressor. In a hermetic compressor in which a compression mechanism that performs a compression operation via a crankshaft and an electric motor that drives the compression mechanism are housed in a hermetic container , the compression mechanism has a suction port and a discharge port. A structure that performs compression operation by sequentially reducing the volume with rotation, and the connection pipe to the suction port of the compression mechanism is a compression pipe made of a copper pipe and a weld pipe having a diameter larger than the outer diameter of the guide pipe It is composed of an integrated part brazed on the mechanism part suction port side, and the guide tube and the compression mechanism part suction port are press-fitted into close contact with each other to block the space inside the sealed container and the compression mechanism part suction port, The welded tube has an outer diameter expanding portion on the compression mechanism portion side, and is connected to the outer diameter expanding portion and an unexpanded portion by an inclined inclined surface, and is formed on the compression mechanism portion side of the outer diameter expanding portion. Resistance welding with a flat part formed on the outer periphery of the sealed container Wherein the is fixed by diffusion welding, a hermetic compressor.