JP2018204453A - Hermetically sealed compressor and method of manufacturing hermetically sealed compressor - Google Patents

Abstract

To provide a hermetically sealed compressor capable of suppressing deformation to easily secure reliability even in a case of forming a flat surface on an outer peripheral surface of a cylindrical member, and a method of manufacturing the hermetically sealed compressor.SOLUTION: A hermetically sealed compressor comprises a center housing 10A having a cylindrical member. The cylindrical member has an outer surface 42 on which a cross sectional shape of the cylindrical member cut vertically to an axial direction has a fixed outer diameter, and a cylindrical inner surface 43 on which the cross sectional shape of the cylindrical member has a fixed inner diameter. The outer surface 42 has a flat surface 40 positioned on a center side with respect to the outer diameter. A center Oof the inner diameter of the cylindrical member is positioned on the opposite side to the flat surface 40 side with a center Oof the outer diameter of the cylindrical member held therebetween.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hermetic compressor and a method for manufacturing a hermetic compressor.

  As a compressor installed in an air conditioner or a refrigeration apparatus including a refrigeration circuit in which a refrigerant circulates, there is a compressor in which a compression mechanism and an electric motor are built in a hermetic container, and the compressor is also called a hermetic compressor. . The compression mechanism built in the hermetic compressor is, for example, a scroll type or a rotary type. When only one stage is installed on the rotary shaft, there are cases where two or more stages are installed.

  The housing of the hermetic compressor usually has a cylindrical shape, and the outer peripheral surface has a curved surface. Moreover, the connection terminal for supplying electric power to the built-in electric motor is installed in the housing, and the connection terminal is fixed to the housing by welding.

  As for the surface to which the connection terminal is connected in the housing, a flat surface is formed by cutting or the like on the outer peripheral surface having a curved surface of the housing so that the welding electrode can be in close contact during welding.

  The following Patent Document 1 discloses a technique related to a sealed container in which a compressor element (compression mechanism) of a scroll compressor is built. In patent document 1, the flat surface for resistance-welding a connection terminal is shape | molded by the outer side rather than the internal diameter of a trunk | drum on the trunk | drum of an airtight container.

Japanese Patent Laid-Open No. 9-14158

  Conventionally, a housing of a hermetic compressor has a cylindrical shape, and a cross-sectional shape cut in a direction perpendicular to the axial direction has a constant thickness. That is, the center of the outer diameter and inner diameter of the cylindrical housing coincide. When manufacturing a cylindrical member of a housing, there is a method in which a steel material is bent into a cylindrical shape, and then a facing surface is welded to form a cylindrical shape.

Further, when a relatively high pressure refrigerant such as a CO ₂ refrigerant is applied to the hermetic compressor, a housing is manufactured by processing a general-purpose (commercially available) steel pipe having a cylindrical shape. In this case, since the steel pipe is an integrally molded product, the housing can withstand a higher pressure than when the steel material is bent and welded.

  On the other hand, the outer diameter and thickness of general-purpose steel pipes are determined according to standards such as JIS standards. When a general-purpose steel pipe is used in the manufacture of the housing, if a flat surface is formed on the outer peripheral surface of the housing described above, the flat surface is located on the inner side of the outer diameter of the housing, so that it is thicker than parts other than the flat surface. Becomes thinner.

  Therefore, there is a problem that it is difficult to ensure the reliability of the housing as the pressure vessel because the thickness of the cylindrical member is reduced on the flat surface of the housing to which the connection terminal is connected, the strength is low, and the housing is easily deformed. For example, in order to ensure the thickness of the flat surface of the housing, the cylindrical member must be formed using a steel pipe that does not exist in the standard such as JIS standard or a steel pipe that is not distributed as a general-purpose product. Or when using the steel pipe currently distribute | circulated as a general purpose product, in order to make a housing into desired thickness, it is necessary to employ | adopt a steel pipe with a large size and to cut out with respect to an outer peripheral surface.

  The present invention has been made in view of such circumstances, and in the case where a flat surface is formed on the outer peripheral surface of the cylindrical member, the hermetic seal that can suppress deformation and ensure reliability more easily. It aims at providing the manufacturing method of a type compressor and a closed type compressor.

In order to solve the above problems, the hermetic compressor and the method for manufacturing the hermetic compressor of the present invention employ the following means.
That is, the hermetic compressor according to the present invention includes a housing having a cylindrical member, and the cylindrical member has an outer diameter with a constant cross-sectional shape of the cylindrical member cut in a direction perpendicular to the axial direction. An outer surface having a cylindrical inner surface having a constant inner diameter in the cross-sectional shape of the cylindrical member, and the outer surface has a flat surface located closer to the center than the outer diameter, and the cylindrical shape The center of the inner diameter of the member is located on the side opposite to the flat surface side with the center of the outer diameter of the cylindrical member interposed therebetween.

  According to this configuration, the housing has a cylindrical member. The outer surface of the cylindrical member having a constant outer diameter has a flat surface located closer to the center than the outer diameter of the cylindrical member, and the inner surface of the cylindrical member has a constant inner diameter. The center of the inner diameter of the cylindrical member is located on the opposite side of the flat surface side with the center of the outer diameter of the cylindrical member interposed therebetween. Therefore, the flat surface formed on the outer surface is located closer to the center than the outer diameter of the cylindrical member, but the portion corresponding to the flat surface compared to the case where the outer surface of the cylindrical member and the center of the inner surface are aligned. The thickness of the cylindrical member is not reduced, the strength of the cylindrical member is ensured, and deformation is suppressed.

  In the above invention, the thickness of the minimum thickness portion between the outer surface and the inner surface of the flat surface formed on the outer surface is between the outer surface and the inner surface on the side away from the flat surface formed on the outer surface. The thickness may be equal to the thickness of the minimum portion.

  According to this configuration, the stress acting on the minimum thickness portion between the outer surface and the inner surface of the flat surface formed on the outer surface, and the minimum thickness portion between the outer surface and the inner surface on the side away from the flat surface formed on the outer surface. The stress acting on can be made substantially equal.

  The said invention WHEREIN: A through-hole is formed in the said flat surface formed in the said outer surface, and the connecting terminal electrically connected with an electric motor may be fixed to the said through-hole.

  According to this configuration, the through hole is formed on a flat surface formed on the outer surface, and the connection terminal that is electrically connected to the electric motor is fixed to the through hole. When the connection terminal is fixed in the through hole formed in the flat surface formed on the outer surface, the thickness of the fixed portion of the connection terminal is not reduced, and the strength can be ensured.

  A manufacturing method of a hermetic compressor according to the present invention includes a housing having a cylindrical member, and the cylindrical member has an outer diameter with a constant cross-sectional shape of the cylindrical member cut in a direction perpendicular to an axial direction. And a cylindrical inner surface having a constant inner diameter of the cross-sectional shape of the cylindrical member, wherein the outer surface is located closer to the center than the outer diameter. A step of forming a flat surface, and the center of the inner diameter of the cylindrical member is located on the opposite side of the flat surface side with the center of the outer diameter of the cylindrical member interposed therebetween. Forming a step.

  ADVANTAGE OF THE INVENTION According to this invention, when forming a flat surface in the outer peripheral surface of a cylindrical member, a deformation | transformation can be suppressed and reliability can be ensured more easily.

1 is a longitudinal sectional view showing a hermetic compressor according to an embodiment of the present invention. It is a cross-sectional view which shows the center housing of the hermetic compressor which concerns on one Embodiment of this invention, and has shown the state before a through-hole is formed in a flat surface. It is a partial expanded longitudinal sectional view which shows the center housing of the sealed compressor which concerns on one Embodiment of this invention, and has shown the state before a through-hole is formed in a flat surface. It is a cross-sectional view showing a center housing of a conventional hermetic compressor, and shows a state before a through hole is formed on a flat surface. It is a partial expanded longitudinal cross-sectional view which shows the center housing of the conventional hermetic compressor, and has shown the state before a through-hole is formed in a flat surface.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Hereinafter, an example in which the hermetic compressor according to one embodiment of the present invention is applied to a hermetic multistage compressor for an air conditioner or a refrigeration apparatus will be described.
In the present embodiment, for the sake of convenience, an example applied to a hermetic multistage compressor (multistage compressor) 1 configured using a rotary compressor 2 on the lower stage side and a scroll compressor 3 on the higher stage side will be described. The present invention can also be applied to a single-stage scroll compressor or a multi-stage scroll compressor in which both the low-stage side and the high-stage side are scroll compressors.

  As shown in FIG. 1, the multistage compressor 1 using the rotary compressor 2 and the scroll compressor 3 includes a sealed housing 10. The sealed housing 10 includes a cylindrical center housing 10A, a bearing member 31 provided by caulking and fixing on the upper portion of the center housing 10A, a lower housing 10B that seals the lower portion of the center housing 10A, and a bearing housing 31. The upper housing 10C is provided by circumferential welding and seals the upper portion of the center housing 10A.

  An electric motor 4 including a stator 5 and a rotor 6 is fixedly installed at a substantially central portion in the center housing 10A. A rotating shaft (crankshaft) 7 is integrally coupled to the rotor 6. A low-stage rotary compressor 2 is installed below the electric motor 4. The low-stage rotary compressor 2 includes a cylinder chamber 20, is fixedly installed in the center housing 10 </ b> A, is fixedly installed above and below the cylinder body 21, and seals the upper and lower portions of the cylinder chamber 20. An upper bearing 22 and a lower bearing 23, a rotor 24 that is fitted to the crank portion 7A of the rotary shaft 7 and rotates on the inner peripheral surface of the cylinder chamber 20, and the inside of the cylinder chamber 20 is divided into a suction side and a discharge side. The configuration includes an omitted blade, a blade pressing spring, and the like.

  The rotary compressor 2 sucks a low-pressure refrigerant gas into the cylinder chamber 20 through the suction pipe 25 and compresses the refrigerant gas to an intermediate pressure by the rotation of the rotor 24, and then the upper bearing 22 and the lower bearing 23. Are discharged into discharge chambers 26 and 27 formed vertically, and merged in the discharge chamber 26, and then discharged into the center housing 10A. This intermediate-pressure refrigerant gas flows through a gas passage hole provided in the rotor 6 of the electric motor 4 and is guided to the upper space of the electric motor 4 and further sucked into the scroll compressor 3 on the higher stage side. It is designed to be compressed in two stages.

  The high-stage scroll compressor 3 is provided in the upper housing 10C. The scroll compressor 3 includes a bearing member 31 provided with a bearing 30 for supporting a rotating shaft (crankshaft) 7 and spiral wraps 32B and 33B standing on end plates 32A and 33A, respectively. A fixed scroll member 32 and an orbiting scroll member 33 constituting a pair of compression chambers 34 are provided by engaging the wraps 32B and 33B with each other and assembling them on the bearing member 31.

  The scroll compressor 3 further couples the orbiting scroll member 33 and the eccentric pin 7B of the rotary shaft 7 via the drive bush 13, and the orbiting boss portion 33C for driving the orbiting scroll member 33 to revolve orbit, the orbiting scroll member 33, A rotation prevention mechanism 35 that is provided between the bearing member 31 and prevents the rotation of the orbiting scroll member 33 so as to revolve and revolves. A discharge cover 38 fixedly installed so as to surround the discharge valve 36 on the back side of the valve 36, the fixed scroll member 32, and a discharge connected to the center of the discharge cover 38 to discharge compressed high-temperature and high-pressure gas to the outside The tube 39 is provided.

  The scroll compressor 3 sucks the intermediate-pressure refrigerant gas compressed by the rotary compressor 2 installed on the lower stage side and discharged into the hermetic housing 10 into the compression chamber 34, and swirls the intermediate-pressure refrigerant gas. The scroll member 33 is configured to be further compressed to a high pressure by a compression operation by revolving turning driving and then discharged into the discharge cover 38 through the discharge valve 36. The high-temperature and high-pressure refrigerant gas is sent to the outside of the multistage compressor 1, that is, to the refrigeration cycle side through the discharge pipe 39.

  Furthermore, a publicly known positive displacement oil pump 14 is incorporated between the lowermost end of the rotary shaft (crankshaft) 7 and the lower bearing 23 of the rotary compressor 2 installed on the lower stage side. The positive displacement oil pump 14 pumps up the lubricating oil 15 filled in the bottom of the hermetic housing 10, and through bearing holes provided in the rotary shaft 7, the bearing portions of the rotary compressor 2 and the scroll compressor 3. The lubricating oil 15 is forcibly supplied to the required lubricating locations.

  A through hole 41 is formed in the flat surface 40 formed on the outer surface 42 of the center housing 10A. The connection terminal 50 is fixed to the through hole 41 and is electrically connected to the electric motor 4. The connection terminal 50 supplies power to the built-in electric motor 4 via the cable 53. The connection terminal 50 includes a base part 51 and a terminal part 52 fixed to the base part 51. On the flat surface 40, the base portion 51 of the connection terminal 50 is welded and fixed to the through hole 41.

Hereinafter, the center housing 10A of the sealed housing 10 will be described in detail.
The center housing 10A of the sealed housing 10 is a cylindrical member, has a hollow columnar shape, and has a predetermined length along the axial direction. The center housing 10A is manufactured by processing a steel pipe having a cylindrical shape of a general-purpose product (commercial product) defined in a standard such as JIS standard, for example. Since the steel pipe is an integrally molded product, the center housing 10 </ b> A can withstand a higher pressure than when the steel material is bent and welded. The steel pipe used for manufacturing the center housing 10A has, for example, a nominal diameter of 125A, that is, an outer diameter of 139.8 mm, and a nominal thickness of schedule 80, that is, 9 mm.

  The center housing 10A, which is a cylindrical member, includes an outer surface 42 and an inner surface 43, and a cross-sectional shape cut in a direction perpendicular to the axial direction is an annular shape as shown in FIG.

  The diameter of the outer surface 42 of the center housing 10A, that is, the outer diameter is constant, and the cross-sectional shape of the outer surface 42 is circular. Moreover, the diameter of the inner surface 43 of the center housing 10A, that is, the inner diameter is constant, and the cross-sectional shape of the inner surface 43 is circular.

  A flat surface 40 on which the connection terminals 50 are installed is formed on the outer surface 42 of the center housing 10A. Thereby, the flat surface 40 on which the connection terminal 50 is installed is brought into close contact with the welding electrode during welding, and the connection terminal 50 is stably welded and fixed to the center housing 10A. The flat surface 40 is formed, for example, in a rectangular shape in front view on the outer surface 42.

  The flat surface 40 is formed by processing the outer peripheral surface of a cylindrical steel pipe into a flat shape by cutting or the like. In addition, when manufacturing center housing 10A, the process which adjusts a diameter is not given with respect to the outer peripheral surface of a steel pipe.

Flat surface 40, since it is formed by cutting the outer peripheral surface of the steel pipe, the center housing 10A, located at the center O ₁ side than the outer diameter of the outer surface 42 of the center housing 10A. That is, the flat surface 40 is formed inside the outer peripheral surface of the steel pipe having a constant outer diameter.

As shown in FIG. 2, does not coincide with the center O ₂ of the center O ₁ and the inner surface 43 of the outer surface 42 of the center housing 10A, the outer surface 42 and inner surface 43 are formed eccentrically. That is, in the center housing 10A, the center O ₂ of the inner diameter of the inner surface 43 is at a position different from the center O ₁ of the outer diameter of the outer surface 42, and the center O ₂ of the inner diameter sandwiches the center O _{1 of the} outer diameter. It is located on the opposite side to the flat surface 40 side.

Conventionally, as shown in FIGS. 4 and 5, when the inner surface 83 is processed so that the outer surface 82 of the center housing 10A and the centers O ₃ and O ₄ of the inner surface 83 coincide with each other, that is, the outer surface 82 and the inner surface 83 are concentric. when in the center thickness of the housing 10A, the outer surface 42 is the flat surface 40 side minimum thickness portion a ₃ of the formed center O _1, O ₂ opposite the thick portion a ₄ sandwiched therebetween Thinner than. In FIG.4 and FIG.5, the inner surface 84 of the steel pipe before cutting is shown with the dashed-two dotted line.

On the other hand, in the case of the present embodiment, as compared with the case where the outer surface 82 of the center housing 10A and the centers O ₃ and O ₄ of the inner surface 83 are matched, the thickness of the center housing 10A is as shown in FIGS. , thickens the minimum thickness portion a ₁ of the flat surface 40 side which is formed on the outer surface 42, the center O _1, O ₂ is the minimum thickness portion a ₂ of the opposite sandwiching a thinner.

Thus, in the present embodiment, flat surface 40 formed on the outer surface 42, but positioned closer to the center than the outer diameter of the center housing 10A, the center O ₂ is eccentric of the center O ₁ and the inner surface 43 of the outer surface 42 Therefore, compared with the case where the outer surface 82 of the center housing 10A and the centers O ₃ and O ₄ of the inner surface 83 are matched, the thickness of the center housing 10A corresponding to the flat surface 40 is not reduced. The strength of the housing 10A is ensured and deformation is suppressed. Therefore, when the flat surface 40 is formed on the outer peripheral surface of the center housing 10A, deformation can be suppressed and reliability can be ensured.

The inner surface 43 of the center housing 10A has a circular cross section cut by cutting or the like with respect to the inner surface 43 of a general-purpose steel pipe. In FIG.2 and FIG.3, the inner surface 44 of the steel pipe before cutting is shown with the dashed-two dotted line. Then, as a result of processing such as cutting, the center of the inner surface 43 is formed at a position different from the center of the outer surface 42. More specifically, the inner surface 43 is formed such that the center O ₂ of the inner diameter is located on the opposite side of the flat surface 40 with the center O _{1 of the} outer diameter in between. Further, by performing cutting or the like, the surface can be made smoother than before processing, and the accuracy of the circular shape can be increased.

The thickness of the minimum thickness portion A ₁ having the smallest thickness between the outer surface 42 and the inner surface 43 in the flat surface 40 formed on the outer surface 42 is the thickness between the outer surface 42 and the inner surface 43 on the side away from the flat surface 40. There is approximately equal to the thickness of the minimum of the minimum thickness portion a _2. Accordingly, the stress acting on the minimum thickness portion A ₁ in the flat surface 40 formed on the outer surface 42, and the stress acting on the minimum thickness portion A ₂ in the side away from the flat surface 40 formed on the outer surface 42 Can be made approximately equal.

Or, the thickness of the minimum thickness portion A ₁ may be set to be slightly larger than the thickness of the minimum thickness portion A _2. Thereby, the stress concentrated on the flat surface 40 formed on the outer surface 42 can be reduced.

  A through hole 41 is formed in the flat surface 40 formed on the outer surface 42, and the base portion 51 of the connection terminal 50 is fixed to the through hole 41. As described above, in the present embodiment, since the thickness is not reduced on the flat surface 40 as compared with the conventional case and deformation is suppressed, the strength of the fixing portion of the connection terminal 50 is ensured.

As described above, according to the present embodiment, the flat surface 40 formed on the outer surface 42 is located closer to the center than the outer diameter of the center housing 10A. Then, as shown in FIGS. 2 and 3, since the center O ₂ of the center O ₁ and the inner surface 43 of the outer surface 42 is eccentric, the thickness of the center housing 10A of the portion corresponding to the flat surface 40, a conventional The center housing 10A is ensured in strength and is not deformed as compared with the above structure. Therefore, when the flat surface 40 is formed on the outer peripheral surface of the center housing 10A, deformation can be suppressed and reliability can be ensured.

1: Multistage compressor 2: Rotary compressor 3: Scroll compressor 4: Electric motor 5: Stator 6: Rotor 7: Rotating shaft 7A: Crank portion 7B: Eccentric pin 10: Sealed housing 10A: Center housing 10B: Lower housing 10C : Upper housing 13: Drive bush 14: Positive displacement oil pump 15: Lubricating oil 20: Cylinder chamber 21: Cylinder body 22: Upper bearing 23: Lower bearing 24: Rotor 25: Suction pipe 26: Discharge chamber 27: Discharge chamber 30: Bearing 31: Bearing member 32: Fixed scroll member 32A: End plate 32B: Spiral wrap 32C: Discharge port 33: Orbiting scroll member 33A: End plate 33B: Spiral wrap 33C: Orbiting boss 34: Compression chamber 35: Rotation prevention Mechanism 36: Discharge valve 38: Discharge cover 9: discharge pipe 40: flat surface 41: through hole 42: outer surface 43: inner surface 44: inner surface 50: Connection terminal 51: base portion 52: terminal 53: Cable 82: outer surface 83: inner surface 84: inner surface

Claims (4)

A housing having a cylindrical member;
The cylindrical member is
An outer surface in which a cross-sectional shape of the cylindrical member cut in a direction perpendicular to the axial direction has a constant outer diameter;
A cylindrical inner surface in which the cross-sectional shape of the cylindrical member has a constant inner diameter;
Have
The outer surface has a flat surface located closer to the center than the outer diameter,
The center of the inner diameter of the cylindrical member is a hermetic compressor located on the opposite side of the flat surface side with the center of the outer diameter of the cylindrical member interposed therebetween.   The thickness of the minimum thickness portion between the outer surface and the inner surface on the flat surface formed on the outer surface is the minimum thickness between the outer surface and the inner surface on the side away from the flat surface formed on the outer surface. The hermetic compressor according to claim 1, wherein the hermetic compressor is equal in thickness to the portion. A through hole is formed in the flat surface formed on the outer surface;
The hermetic compressor according to claim 1 or 2, wherein a connection terminal electrically connected to the electric motor is fixed to the through hole. A housing having a cylindrical member, wherein the cylindrical member is cut in a direction perpendicular to the axial direction, the outer surface of the cylindrical member having a constant outer diameter, and the sectional shape of the cylindrical member Is a method of manufacturing a hermetic compressor having a cylindrical inner surface having a constant inner diameter,
Forming a flat surface located on the center side of the outer diameter on the outer surface;
Forming the inner surface such that the center of the inner diameter of the cylindrical member is located on the opposite side of the flat surface side with the center of the outer diameter of the cylindrical member interposed therebetween;
The manufacturing method of the hermetic compressor which has.

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