JP5153301B2 - Method for producing reservoir container of hermetic compressor and hermetic compressor - Google Patents

Description

  The present invention relates to a method for producing a reservoir for a hermetic compressor and a hermetic compressor, in particular, a method for producing a summit container for a hermetic compressor containing a metal strainer filter, and a hermetic seal produced by the method. The present invention relates to a hermetic compressor having a reservoir for a mold compressor.

  A conventional hermetic compressor is composed of a compressor body and a reservoir. The method for manufacturing a liquid reservoir is one in which the components to be accommodated are assembled and mounted in the interior, and then put into a high-temperature reduction furnace, resulting in good productivity and low manufacturing costs. At this time, the container body (same as the iron container) that constitutes the liquid reservoir and the metal strainer filter housed inside the metal strainer filter are press-fitted into the iron container, and brazing material is installed near the joint. In addition, brazing is performed by putting it in a high-temperature reducing furnace (for example, see Patent Document 1).

Japanese Patent Laying-Open No. 2005-9459 (page 4, FIG. 3)

  The invention disclosed in Patent Document 1 requires a secondary material such as an in-furnace brazing material (for example, copper brazing) in order to join, so that the manufacturing cost is increased and a high temperature reducing furnace is used. As a result, the steel container is dulled and the properties such as tensile strength are lowered, so that there is a problem that it is necessary to increase the plate thickness in order to satisfy the design criteria such as pressure resistance.

The present invention has been made in order to solve the above-mentioned problems, and a first object is to reduce the amount of auxiliary materials such as furnace brazing material (for example, copper brazing material) and to produce it in an environmentally friendly manner. A manufacturing method of a liquid reservoir for a hermetic compressor that reduces the cost is obtained.
The second object is to obtain a method for manufacturing a reservoir for a hermetic compressor that secures the pressure resistance of the iron container and realizes a reduction in direct material cost by reducing the plate thickness.
Furthermore, the third object is to obtain a hermetic compressor having a liquid reservoir for a hermetic compressor manufactured by the method for producing a liquid reservoir for the hermetic compressor.

A method for manufacturing a reservoir for a hermetic compressor according to the present invention includes a compressor main body that houses refrigerant compression means for compressing a refrigerant, and a liquid reservoir for supplying the refrigerant to the compressor main body. In the sealed compressor to be manufactured, a method for producing a reservoir for a sealed compressor for producing the reservoir,
Contacting the outer surface of the cylindrical portion of the metal strainer filter having a cylindrical portion with the inner surface of the container main body constituting the reservoir, and press-fitting the metal strainer filter into the container main body; ,
Joining the inner surface of the container body and the outer surface of the cylindrical portion using resistance welding;
Fixing the ring-shaped plate to the outer periphery of the container body by resistance welding or caulking;
I have a,
The ring-shaped plate fixed to the outer periphery of the container main body is fixed to a fixing plate provided on a side surface of the compressor main body by TIG welding .

Since the method for manufacturing a reservoir for a hermetic compressor according to the present invention joins a metal strainer filter to a container body using resistance welding, the amount of auxiliary materials such as a brazing material in a furnace (for example, copper brazing) is used. And the manufacturing cost is reduced.
Moreover, unlike conventional brazing in a furnace, the container body is not exposed to high temperatures, and thus the material is not annealed. Therefore, since the tensile strength improved by work hardening is ensured as it is, the plate thickness can be reduced.

[Embodiment 1: Hermetic compressor]
FIG. 1 is a side sectional view schematically showing the configuration of a hermetic compressor according to Embodiment 1 of the present invention. In FIG. 1, a hermetic compressor (hereinafter referred to as “compressor”) 1 includes a compressor main body 10 that compresses a refrigerant, and a reservoir 20 that supplies the refrigerant to the compressor main body 10.
The compressor body 10 includes a sealed container 13 having a discharge pipe 14 installed on the upper surface, a compression mechanism 11 housed in the sealed container 13, and an electric motor 12 that drives the compression mechanism 11. At this time, a fixing plate 15 for fixing the liquid reservoir 20 is provided on the side surface of the sealed container 13, and a discharge pipe 25 communicating the compressor body 10 and the liquid reservoir container 20 is provided on the side surface of the sealed container 13. It is connected.

The liquid reservoir 20 is manufactured by a method for manufacturing a liquid reservoir for a hermetic compressor according to Embodiment 2 to be described later. That is, the liquid reservoir 20 is a sealed container (hereinafter sometimes referred to as a “container body”) in which the upper cup 22 and the lower cup 24 are associated with each other, and includes a suction pipe 21 on the upper surface and a discharge pipe 25 on the lower surface. However, a metal strainer filter 23 is installed inside.
Therefore, the refrigerant gas flows into the liquid reservoir 20 through the suction pipe 21 and is introduced into the compressor body 10 through the discharge pipe 25 after the foreign matter is removed by the metal strainer filter 23. Then, the refrigerant gas compressed in the compression mechanism 11 driven by the electric motor 12 flows out of the compressor body 10 from the discharge pipe 14.

[Embodiment 2: Manufacturing method of liquid reservoir for hermetic compressor]
2 to 3 are cross-sectional views in side view schematically showing the manufacturing method of the reservoir for the hermetic compressor according to Embodiment 2 of the present invention, following the steps. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted. Each process (step) is abbreviated as “S”.
(S1) The suction pipe 21 is fixed to the upper cup 22 with gas brazing. At this time, when silver solder is used as the gas brazing material, a cleaning process for dropping the flux is additionally performed. In order not to dull the material, it is desirable to use a material having a melting point as low as about 700 ° C. like silver solder (see FIG. 2A).

  (S2) The metal strainer filter 23 is press-fitted into the upper cup 22. That is, the metal strainer filter 23 includes a filter portion 23a and a cylindrical cylindrical portion 23b that holds the filter portion 23a, and the outer surface of the cylindrical portion 23b is in contact with the inner surface of the upper cup 22 ( (See (b) of FIG. 2).

(S3) The outer surface of the cylindrical portion 23b of the metal strainer filter 23 and the inner surface of the upper cup 22 are fixed by resistance welding (see FIG. 3A).
At this time, spot welding, seam welding, roll spot welding, or the like is applied to resistance welding. The number of welds is required to be three or more and should be set so as not to resonate with the vibration of the compressor body 10.
Moreover, about resistance welding, you may weld several points | intervals which provided the space | interval intermittently 1 point at a time, or multiple points | pieces simultaneously. At this time, an interval of 20 mm or more is necessary in order to prevent a decrease in welding strength due to the diversion.
Further, resistance welding can be continuously performed linearly.

  (S4) The exhaust pipe 25 is gas brazed to the lower cup 24 and then cleaned. Next, the lower cup 24 is press-fitted into the upper cup 22, and in this press-fitted state, the joint between the upper cup 22 and the lower cup 24 is fixed by arc welding. In addition, MAG welding, TIG welding, carbon dioxide gas welding, etc. are applied to arc welding (refer FIG.3 (b)).

According to the above manufacturing method, the upper cup 22 and the lower cup 24 formed by drawing or the like are not heated to a high temperature after processing, so that the material is not dulled and maintained in a work hardening state. The Therefore, since the pressure strength is improved, it is suitable for a hermetic compressor using a carbon dioxide (CO ₂ ) refrigerant whose internal pressure increases to 5 MPa. For example, the thickness of a reservoir container corresponding to a carbon dioxide (CO ₂ ) refrigerant and having an outer diameter of about 60 mm to 80 mm is reduced to 3 mm or less even if it is a commercially available material (such as a SPHD material having a tensile strength of about 27 MPa). Can be suppressed.

  Moreover, since the metal strainer filter 23 is fixed to the upper cup 22 by resistance welding, it does not come off. If the metal strainer filter 23 is press-fitted as in the prior art and is “crimped” from the outside of the upper cup 22 by grooving or pushing a protrusion, it may come off when the internal pressure increases to 5 MPa. In the present invention, it does not deviate as such.

Furthermore, according to the present invention, although a gas brazing material (for example, silver brazing) is used, a container body (iron container) and a metal strainer filter can be used without using auxiliary materials such as an in-furnace brazing material (for example, copper brazing). By joining, the auxiliary material can be reduced.
In addition, the liquid reservoir 20 is press-fit and joined to the upper cup 22 with the lower cup 24, and the joint is joined using arc welding, but the joint of the upper cup 22 is not distorted during press-fitting. The press-fitting is simple.

[Spot welding equipment]
FIG. 4 is a side sectional view schematically showing a spot welding apparatus used in the method for manufacturing a reservoir for a hermetic compressor according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.
In FIG. 4, the spot welding apparatus 2 includes a spot gun apparatus 30, a cup rotating apparatus 40, a welding power supply circuit 50, and a control apparatus (not shown).

The spot gun device 30 includes an outer spot electrode 31 and an inner spot electrode 32 (which may be collectively referred to as “electrodes” hereinafter), an outer spot electrode 31 and an inner spot electrode 32 whose tips are opposed to each other. Electrode advance / retreat means (not shown) for advancing and retreating (adjacent or separated) is provided.
The cup rotating device 40 includes a chuck 41 that holds the upper cup 22 and an electric motor 42 that rotates the chuck 41.
The welding power supply circuit 50 allows a predetermined current (for example, about 3 KA) to flow between the outer spot electrode 31 and the inner spot electrode 32.
The metal strainer filter 23 is installed in the spot welding apparatus 2 while being press-fitted into an appropriate position in the upper cup 22.

Next, the operation of the spot welding apparatus 2 will be described. With the upper cup 22 held by the chuck 41, the outer spot electrode 31 constituting the spot gun device 30 is on the outer surface of the upper cup 22, and the inner spot electrode 32 constituting the spot gun device 30 is a metal strainer filter. The outer surface and the inner surface are sandwiched with a constant force by abutting on the inner surface of the cylindrical portion 23b.
Then, after a certain period of time has passed, the welding power source circuit 50 causes a large current (for example, about 10 KA) to flow between the outer spot electrode 31 and the inner spot electrode 32. At this time, since the upper cup 22 and the cylindrical portion 23b of the metal strainer filter 23 are both made of iron and heat is generated at the contact portion and melts, they are welded and joined.

Further, when the welding nugget is stabilized, the outer spot electrode 31 is separated from the outer surface of the upper cup 22, and the inner spot electrode 32 is separated from the inner surface of the cylindrical portion 23 b of the metal strainer filter 23.
Therefore, when the motor 42 is rotated and the upper cup 22 is rotated by a predetermined angle (when the next welding position coincides with the electrode position), the rotation is stopped and spot welding is performed in the same manner as described above.
Therefore, by repeating the rotation of the upper cup 22 and spot welding, it is possible to join the necessary portions (predetermined intervals).

[Seam welding equipment]
FIG. 5 is a cross-sectional side view schematically showing a seam welding device used in the method for manufacturing a reservoir for a hermetic compressor according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.
In FIG. 5, the seam welding apparatus 3 includes a roller gun device 60, a welding power supply circuit 70, and a control device (not shown). The seam welding device 3 may be referred to as a roller welding device 3.

The roller gun device 60 includes an outer roller electrode 61 and an inner roller electrode 62 (hereinafter sometimes collectively referred to as “electrodes”), an outer roller electrode 61 and an inner roller electrode 62 whose tips are opposed to each other. An outer side roller driving mechanism 63 and an inner side roller driving mechanism 64 that are respectively advanced and retracted (adjacent or separated) and rotated are provided.
The welding power supply circuit 70 allows a predetermined current (for example, about 3 KA) to flow between the outer roller electrode 61 and the inner roller electrode 62.
The metal strainer filter 23 is installed in the seam welding apparatus 3 while being press-fitted into an appropriate position in the upper cup 22.

Next, the operation of the seam welding apparatus 3 will be described. The outer roller electrode 61 constituting the roller gun device 60 abuts on the outer surface of the upper cup 22, and the inner roller electrode 62 constituting the roller gun device 60 abuts on the inner surface of the cylindrical portion 23b of the metal strainer filter 23, respectively. The outer surface and the inner surface are sandwiched with a certain force.
Then, when a certain period of time has passed, the welding roller circuit 61 and the inner roller electrode 62 cause an intermittent current of a certain frequency to flow between the outer roller electrode 61 and the inner roller electrode 62 by the welding power supply circuit 70. The roller electrode 62 is rotated.

At this time, since the upper cup 22 and the cylindrical portion 23b of the metal strainer filter 23 are both made of iron, heat is generated and melted at the contact portion.
That is, by performing welding and joining continuously, the welded portions overlap each other, and continuous linear welding (seam welding) can be performed. As a result, the space between the outer surface of the cylindrical portion 23b of the metal strainer filter 23 and the inner side of the upper cup 22 is closed over the entire circumference (there is no gap), so that the refrigerant gas that has flowed into the liquid reservoir 20 Always passes through the filter unit 23a. Therefore, the foreign matter contained in the refrigerant gas is reliably captured, and the foreign matter does not enter the compressor body 10.

[Embodiment 3: Hermetic compressor]
FIG. 6 is a side sectional view schematically showing a part of the configuration of the hermetic compressor according to the third embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.
In FIG. 6, in a liquid reservoir 80 included in the hermetic compressor according to the third embodiment, a ring-shaped plate 26 is fixed to the outer periphery of the upper cup 22 by resistance welding or caulking.

In the first embodiment described above (see FIG. 1), the liquid reservoir 20 is fixed to the compressor body 10 via the fixing plate 15. At this time, as a method of fixing the liquid reservoir 20 to the fixing plate 15, it is fixed through a part such as an iron band or is fixed by, for example, TIG welding.
However, when trying to weld the reservoir 20 (more precisely, the upper cup 22) having a plate thickness of about 2 mm to the fixed plate 15, for example, by TIG welding, the reliability may be impaired due to a reduction in the plate thickness due to welding. However, since the apparent thickness of the liquid reservoir 80 is increased by the ring-shaped plate 26, the fear is eliminated.

  As described above, the present invention can reduce the amount of auxiliary materials such as brazing material in the furnace, or can reduce the cost of direct materials by reducing the plate thickness by securing the pressure resistance of the container body. Also, it can be widely used as a method for producing a reservoir for various types of hermetic compressors and various types of hermetic compressors.

1 is a cross-sectional view in side view showing the configuration of a hermetic compressor according to Embodiment 1 of the present invention. Sectional drawing of the side view which shows typically the manufacturing method of the reservoir container of the hermetic compressor which concerns on Embodiment 2 of this invention later on in process. FIG. 3 is a side sectional view schematically showing a process following FIG. 2. Sectional drawing of the side view which shows the spot welding apparatus used for the manufacturing method shown in FIG. Sectional drawing of the side view which shows the seam welding apparatus used for the manufacturing method shown in FIG. The cross section of the side view which shows typically a part of structure of the hermetic compressor which concerns on Embodiment 3 of this invention.

Explanation of symbols

  1: Sealed compressor (compressor), 2: Spot welding device, 3: Seam welding device, 10: Compressor body, 11: Compression mechanism, 12: Electric motor, 13: Sealed container, 14: Discharge pipe, 15: Fixing plate, 20: Liquid reservoir, 21: Suction pipe, 22: Upper cup, 23: Metal strainer filter, 23a: Filter part, 23b: Cylindrical part, 24: Lower cup, 25: Discharge pipe, 26: Ring 30: Spot gun device, 31: Spot electrode for outside, 32: Spot electrode for inside, 40: Cup rotating device, 41: Chuck, 42: Electric motor, 50: Welding power circuit, 60: Roller gun device, 61: Outer roller electrode 62: Inner roller electrode 63: Outer roller drive mechanism 64: Inner roller drive mechanism 70: Welding power circuit 80: Welding power circuit

Claims (5)

A hermetic type for producing a liquid reservoir in a hermetic compressor comprising a compressor main body for storing a refrigerant compression means for compressing a refrigerant and a liquid reservoir for supplying the refrigerant to the compressor main body. A method of manufacturing a reservoir for a compressor,
Contacting the outer surface of the cylindrical portion of the metal strainer filter having a cylindrical portion with the inner surface of the container main body constituting the reservoir, and press-fitting the metal strainer filter into the container main body; ,
Joining the inner surface of the container body and the outer surface of the cylindrical portion using resistance welding;
Fixing the ring-shaped plate to the outer periphery of the container body by resistance welding or caulking;
I have a,
The ring-shaped plate fixed to the outer periphery of the container main body is fixed to a fixing plate provided on a side surface of the compressor main body by TIG welding .   Resistance welding is performed with a predetermined interval between the outer spot electrode contacting the outer surface of the container body and the inner spot electrode contacting the inner surface of the cylindrical portion of the metal strainer filter. The method for producing a reservoir for a hermetic compressor according to claim 1, wherein:   The joining step is a resistance welding performed in a continuous line by an outer roller electrode that contacts the outer surface of the container body and an inner roller electrode that contacts the inner surface of the cylindrical portion of the metal strainer filter. The method for producing a reservoir for a hermetic compressor according to claim 1, wherein: A hermetic compressor composed of a compressor main body containing a refrigerant compression means for compressing the refrigerant and a liquid reservoir for supplying the refrigerant to the compressor main body,
A hermetic compressor, wherein the reservoir is manufactured by the method for manufacturing a reservoir of a hermetic compressor according to any one of claims 1 to 3. The hermetic compressor according to claim 4, wherein a carbon dioxide refrigerant is used as the refrigerant.

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