JP2013160217A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce stress strain in inserting a liner into an inlet with respect to a refrigerant intake structure of a hermetic compressor and to curtail heat transfer by brazing.SOLUTION: A decrease in stress strain and curtailment of heat transfer with respect to a compression mechanism part can be achieved by providing a protrusion 8a on an outer diameter of a liner 8 and using it as a hermetically sealed part with an inner diameter surface of an inlet 7. In addition, an outer surface shape of the outer diameter protrusion is made as a spherical shaped protrusion 8b with a proximal point put on an axis, so that misalignment with guide pipes 3 mounted on the inlet 7 and connection aperture 2 of a hermetic vessel 1 can be absorbed for achieving hermetic seal and a degree of assembling margin can be enhanced.

Description

  The present invention relates to a hermetic compressor used for an air conditioner, a refrigerator, a water heater, and the like.

  Conventionally, the structure of the refrigerant suction portion of this type of hermetic compressor is a structure in which a liner is interposed between a suction port provided in the compression mechanism and a connection port provided in the sealed container (see, for example, Patent Document 1). It has become.

  FIG. 5 is a cross-sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. 6 is an enlarged view of the cross-sectional structure of the refrigerant suction portion in FIG. As shown in FIGS. 5 and 6, a connection port 2 is provided in a sealed container 1 made of an iron material, and a guide tube 3 made of a copper tube is brazed and fixed by a silver row 4. On the other hand, the suction port 7 connected to the compression chamber 6 inside the compression mechanism section 5 has a cylindrical inner diameter surface and a cylindrical outer diameter surface of the liner 8 made of an iron material and entirely or partially plated with copper. It is fixed in a state where it is tightly sealed by surface contact, whereby the discharged gas refrigerant and the suction refrigerant inside the sealed container 1 are isolated. Further, the guide pipe 3, the copper plating portion of the liner 8 and the suction connection pipe 9 made of a copper material are integrally fixed by brazing with a copper row 10, thereby blocking the suction area and the outside of the hermetic compressor. Thereby, the sealing structure of the refrigerant | coolant suction part 11 is comprised.

  On the other hand, the assembly process of the motor unit 14 including the hermetic container 1 and the compression mechanism unit 5 and the stator 12 and the rotor 13 is performed in a state where the stator 12 is preliminarily fitted and fixed inside the hermetic container 1. Is inserted from the outside, and the compression mechanism part 5 is hermetically fixed by welding through the outside of the sealed container 1. At this time, it is necessary to position and compress and fix the compression mechanism portion 5 in a state where the cylindrical hole center of the suction port 7 provided in the compression mechanism portion 5 and the axial center position of the guide tube 3 are substantially matched. Thereafter, a liner 8 having an outer diameter (φD2) slightly larger than the inner diameter (φd1) of the suction port 7 is passed through the guide tube 3 and press-fitted and fixed to the suction port 7, and as described above, the seal is in close contact with the suction port 7 Form the structure. Further, the suction connection pipe 9 is inserted into the inner diameter of the copper plating at the other end of the liner 8, and these are brazed and fixed integrally with a copper solder 10, thereby blocking the outside of the sealed container in the refrigerant suction part 11 as described above. Assemble the structure.

Japanese Unexamined Patent Publication No. Sho 63-36075

  However, in the above-described conventional configuration, by inserting a liner having an outer diameter slightly larger than the inner diameter of the suction port in order to ensure tight sealability, the stress generated by the shimeshiro is compressed as stress strain on the entire cylindrical tight seal surface. In the assembly process for sealing the outside of the sealed container that adversely affects the mechanism part, the heating effect when the liner, guide tube, and suction connection tube are integrally brazed and fixed is transmitted to the suction port via the liner, and the compression mechanism Have the problem of deteriorating the performance and reliability of the parts.

In addition, in the conventional configuration in the previous period, the axial position of the inner surface of the cylindrical suction port and the position of the inner surface of the guide tube assembled to the connection port substantially coincide with each other so that the compression mechanism is accurately placed inside the sealed container. If it has to be fixed by welding, if it deviates, it will cause galling inside the inlet when the liner is inserted, and there is a problem in assembling that the insertion itself cannot be performed.

  The present invention solves the above-described conventional problems, and minimizes the tight seal portion between the suction port and the liner necessary for the function, and the axial center position of the suction port and the guide tube is shifted so that the compression mechanism portion is provided. An object of the present invention is to provide a refrigerant suction portion structure for a hermetic compressor that is excellent in performance, reliability, and assemblability by improving the assembly margin when it is fixed by welding.

  In order to solve the above-described conventional problems, the structure of the refrigerant suction portion of the hermetic compressor according to the present invention is such that the tightly sealed portion in the liner insertion portion to the suction port is a convex contact instead of a cylindrical outer surface. This is limited to the part.

  This makes it possible to ensure the necessary tight sealability while reducing the stress strain on the compression mechanism due to the liner insertion, and the suction port by heating when the liner, guide tube and suction connection tube are fixed together by brazing It is possible to reduce the heat transfer to the.

  The structure of the refrigerant suction portion of the hermetic compressor according to the present invention makes it possible to secure the necessary tight sealability while reducing the stress distortion to the compression mechanism portion due to the insertion of the liner into the suction port. It is possible to reduce heat transfer to the suction port due to heating when the suction connection pipe is fixed by brazing.

Sectional drawing of the refrigerant | coolant suction inlet part in Embodiment 1 of this invention Sectional drawing of the refrigerant | coolant suction inlet part in Embodiment 2 of this invention Sectional drawing explaining the time of the vertical-axis center deviation of the suction inlet and guide tube in Embodiment 2 of this invention Sectional drawing explaining the time of the axial direction center deviation of the suction inlet and guide tube in Embodiment 2 of this invention Sectional view of a conventional hermetic compressor described in Patent Document 1 Sectional drawing of the refrigerant | coolant suction part of conventional patent document 1

  A first aspect of the present invention is a hermetic compressor having a compression mechanism part and an electric motor for driving the compression mechanism part in the hermetic container, and the connection structure of the suction part is provided in the suction port and the hermetic container leading to the compression chamber of the compression mechanism part. A connecting hole is formed through a liner, one of which is closely connected to the protrusion provided on the outer periphery of the liner and the suction hole of the compression mechanism, and the other is brazed to the liner, the sealed container, and the suction connecting pipe, or By sealing and fixing by welding, etc., it is possible to secure the necessary tight sealability while reducing stress strain on the compression mechanism due to liner insertion, and fixing the liner, guide tube and suction connection tube by integral brazing It is possible to reduce the heat transfer to the suction port due to heating during the process.

According to the second aspect of the invention, in particular, the outer diameter convex portion in the liner insertion portion of the first aspect of the invention has a spherical shape with the center point on the axis of the liner. That is, the contact seal portion in the liner insertion portion is formed into a spherical shape with the center point on the axis. As a result, it is possible to improve the margin for assembling the liner due to the deviation between the central axis position of the suction port and the central axis position of the guide tube attached to the connection hole provided in the sealed container, and to reduce defective assembly. It is possible. That is, it is possible to reduce assembly defects by improving the margin of deviation between the center axis position of the suction port and the center axis position of the guide tube attached to the connection hole provided in the sealed container.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a refrigerant suction portion in the first embodiment of the present invention.

  In FIG. 1, a convex portion 8a is provided on the outer diameter surface of the liner 8, and the outer diameter size φD3 of the tip portion is slightly larger than the suction port 7 (for example, 10 for the inner diameter size φd1 mm of the suction port 7). (About ˜60 μm), it is configured to be in close contact with the inner diameter surface of the suction port 7 connected to the compression chamber 6 of the compression mechanism portion 5 to exhibit a sealing effect.

  The operation and effect of the refrigerant suction portion of the hermetic compressor configured as described above will be described below.

  A connection port 2 is provided in an airtight container 1 made of an iron material, and a guide tube 3 made of a copper tube is fixed by brazing with a silver solder 4. On the other hand, the suction port 7 is in close contact with the cylindrical inner diameter surface and the outer diameter surface of the liner 8 made of an iron material, which is entirely or partially copper-plated, and the tip of the convex portion 8a is almost in line contact. It is fixed in a sealed state.

  As described above, in the present embodiment, the stress from the liner 8 applied to the suction port 7 is obtained by forming the tight seal portion between the liner 8 and the suction port 7 on the outer diameter surface provided on the liner 8. Strain can be suppressed to the minimum necessary, and in addition, the suction port 7 that is transmitted through the liner 8 by heating when the liner 8, the guide tube 3, and the suction connection tube 9 are integrally brazed and fixed with the copper solder 10. It is possible to reduce heat transfer to the compressor and improve the performance and reliability of the compression mechanism.

(Embodiment 2)
FIG. 2 shows a cross-sectional view of the refrigerant suction part according to the second embodiment of the present invention. FIG. 3 is preliminarily brazed and fixed to the suction port 7 and the connection port 2 of the sealed container 1 with silver solder 4. FIG. 4 shows a case where the shaft center of the guide tube 3 is displaced in the longitudinal direction of the compressor and the compression mechanism 5 is fixed by welding. FIG. It is a figure when the axial center of the guide pipe | tube 3 fixed by brazing beforehand shift | displaces in the circumferential direction of a compressor, and the compression mechanism part 5 is weld-fixed.

  The operation and effect of the refrigerant suction portion of the hermetic compressor configured as described above will be described below.

  A connection port 2 is provided in an airtight container 1 made of an iron material, and a guide tube 3 made of a copper tube is fixed by brazing with a silver solder 4. On the other hand, the suction port 7 has a cylindrical inner surface and an outer diameter φD4 having a central point on the axial center of the liner 8 made of iron and partially plated with copper. The outer diameter surface is fixed in a tightly sealed state by being in line contact.

As shown in FIG. 2, the assembly procedure of these parts is such that the inner diameter central axis position of the suction port 7 is substantially coincident with the inner diameter central axis position of the guide tube 3 that is previously brazed and fixed to the sealed container 1 with the silver row 4. In addition, it is best to fix the compression mechanism portion from the outside of the sealed container 1 by welding or the like. For example, even when the shaft center is displaced by δ in the axial direction of the compressor when the compression mechanism portion is fixed (FIG. 3), The spherical convex portion 8b provided on the outer diameter of the liner 8 can maintain the tight seal with the suction port 7 while being inclined by α ° between the suction port 7 and the guide tube 3, and the compression mechanism portion can be maintained. Even when the shaft center is rotated by β ° in the circumferential direction of the compressor during fixing (FIG. 4), the spherical convex portion 8b provided on the outer diameter of the liner 8 is the suction port 7 and the guide tube 3 as described above. Can be assembled while maintaining a tight seal with the suction port 7 while tilting γ ° between The ability.

  As described above, in the present embodiment, the close seal portion between the liner 8 and the suction port 7 is the spherical convex portion 8b having an outer diameter having a center point on the axis of the liner 8, and thus the above-mentioned. In addition to the effects of the first embodiment, it is possible to improve the assembly allowance of the refrigerant suction part and improve the quality.

  The present invention can be applied not only to a hermetic compressor for an air conditioner but also to applications such as a hermetic compressor for a refrigerator and a water heater.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Connection port 3 Guide pipe 4 Silver low 5 Compression mechanism part 6 Compression chamber 7 Inlet 8 Liner 8a Convex part 8b Spherical convex part 9 Inlet connection pipe 10 Copper low 11 Refrigerant suction part 12 Stator 13 Rotor 14 Motor part 15 Crankshaft

Claims (2)

In a hermetic compressor provided with a compression mechanism and an electric motor for driving the crankshaft in a hermetic container,
The refrigerant suction portion includes a suction port leading to a compression chamber of the compression mechanism portion and a guide tube fixed to a connection hole provided in the sealed container via a liner,
A convex portion is disposed on the outer periphery of the liner,
The convex portion is a hermetic compressor in which the convex portion is in close contact with the suction hole of the compression mechanism portion. 2. The hermetic compressor according to claim 1, wherein the outer peripheral surface of the convex portion of the liner is a spherical curved surface centered on the central axis in the insertion direction.