KR100565457B1 - Manufacturing Method Of Cylinder for Compressor - Google Patents

Abstract

The present invention relates to a cylinder of a hermetic rotary compressor and a method for manufacturing the same, comprising a cylinder body made of engineering plastics having a compression chamber accommodating a compression roller in a central region thereof, and a wear-resistant metal material inserted into an inner circumferential surface of the compression chamber. A roller contact member, an upper journal and a lower journal of engineering plastics, which are coupled to the upper and lower parts of the cylinder body and formed with a shaft hole in the center thereof, and a wear-resistant metal material that is inserted into an inner circumferential surface of the shaft hole of the upper and lower journals. It characterized by having a metal bearing of.

As a result, it is easy to manufacture and mass-produce, reduce the production cost, lighten the weight of the product, easy to manage, excellent durability and wear resistance, and improve the performance of the compressor cylinder of the closed rotary compressor and its manufacture A method is provided.

Compressor, cylinder, resin, roller

Description

Sealing rotary compressor cylinder and manufacturing method thereof {Manufacturing Method Of Cylinder for Compressor}

1 is a cross-sectional view of a conventional hermetic rotary compressor,

2 is an enlarged cross-sectional view of the cylinder installation region of FIG.

3 is a plan sectional view of a cylinder taken along line III-III of FIG.

Figure 4 is a manufacturing process of the cylinder part for a conventional hermetic rotary compressor,

5 is an enlarged cross-sectional view of the cylinder installation region of FIG. 1 according to the present invention;

Figure 6 is an enlarged perspective view of the cylinder body of Figure 5,

7 is a cross-sectional view of the cylinder along the line VII-VII of FIG. 5;

8 is a manufacturing process of the cylinder part for a hermetic rotary compressor according to the present invention;

* Explanation of symbols for the main parts of the drawings

 1 cylinder 10 cylinder body

11: compression chamber 20: roller contact member

30: coupling nut 35: upper journal

36: lower journal 50: metal bearing

The present invention relates to a cylinder of a hermetic rotary compressor, and more particularly, to a cylinder of a hermetic compressor having improved materials and structures.

As shown in FIG. 1, the hermetic rotary compressor 101 includes a driving unit 120 generating a driving force in a casing 110 forming a closed space, and a cylinder compressing a refrigerant by the driving force of the driving unit 120. It has a structure in which 130 is installed.

The drive unit 120 includes a stator 121 press-fitted into the casing 110, a rotor 123 rotated by the stator 121, and a rotation shaft 125 coupled to the center of the rotor 123. Consists of.

2 and 3, the cylinder 130 is eccentrically coupled to the cylinder body 131 forming the refrigerant compression chamber 131a and the lower end of the rotation shaft 125 of the drive unit 120. Compression roller 133 which rotates while rolling in contact with the inner circumferential surface of the compression chamber 131a of the cylinder body 131 to compress and discharge the refrigerant, and bolts 137 are coupled to the upper and lower portions of the cylinder body 131 to drive the unit 120. And an upper journal 135 and a lower journal 136 supporting the rotating shaft 125.

The cylinder 130 of the conventional hermetic rotary compressor is the cylinder body 131 and the upper and lower journals (135, 136) are made of a cast molding, the manufacturing process briefly referring to Figure 4, the cylinder body 131 And forming processes (S101) for forming the appearance of each of the journals (135, 136), processing of the compression chamber (131a) and the bolt through hole (139) of the cylinder body (131), and the shaft holes of the journals (135, 136). The process consists of a machining step (S102), a washing step (S103) and a final inspection step (S104).

Molding process (S101) is a mold-forming mold corresponding to the cylinder body 131 and each journal (135,136) (S101a), by dissolving the metal raw materials such as cast iron in the furnace (S101b), the molten metal melt is prepared in advance After injection into the mold (mold) of the cylinder body 131 or the mold (mold) of each journal 135 and 136, the castings of the cylinder body 131 or each journal 135 and 136 are molded (S101c), and then After the cooling time has elapsed, the cylinder body 131 or each journal 135 and 136 formed from the mold is separated to perform a finishing operation for removing impurities (S101d), and the molded article is inspected (S101e).

In addition, the machining step (S102) precisely machining the coupling portion (compression chamber 131a, bolt through hole 139, shaft hole, etc.) of the cylinder body 131 and the journals 135 and 136 produced in the molding process. To produce the finished products of the cylinder body 131 and the journals 135 and 136, and primary processing of the upper and lower surfaces of the cylinder body 131 and the reference surface such as one side of each of the journals 135 and 136 in contact with the primary body. (S102a), the coupling machining (S102b) for machining the female thread on the inner diameter surface of the bolt passing hole (139), the shaft machining (S102c) of each journal (135, 136), and the precise machining of the inner peripheral surface of the compression chamber (S102d). Process and post-processing (S102e) process which secondary-processes a reference surface. At this time, each processing process includes an inspection process.

The cylinder body 131 and the journals 135 and 136 which have been subjected to the machining step S102 are completed as a finished product through the product washing step S103 and the final inspection step S104.

By the way, such a conventional cylinder for a compressor is made of a molded body of the cylinder body and the upper and lower journals using a metal material such as cast iron, and is manufactured through several stages of mechanical processing, making the manufacturing process complicated and bulky. Production is difficult and there is a problem that the production cost rises.

In addition, since the cylinder body and the upper and lower journals are made of heavy metal castings, there is a problem in managing products such as transportation and assembly.In the case of castings, there are many bubble defects. There are many difficulties in quality control.

In addition, since the cylinder body and the upper and lower journals are made of a cast molded product having a limit in securing strength, the shaft holes of the upper and lower journals in which the inner circumferential surface of the compression chamber of the cylinder body in roller contact with the rotary shaft of the drive unit come into contact with each other. There is a limit to the durability and wear resistance of the inner circumferential surface. As a result, there is a problem in that the performance of the compressor is reduced due to the decrease in compression efficiency and noise.

Therefore, the object of the present invention is easy to manufacture and mass production, reduce the production cost, the weight of the product can be reduced in weight, easy to manage, excellent durability and wear resistance and can improve the performance of the compressor hermetic rotary compressor It is to provide a cylinder and a method of manufacturing the same.

According to the present invention, in the cylinder of a hermetic rotary compressor, a cylinder body made of an engineering plastic material having a compression chamber accommodating a compression roller in a central region thereof, and a wear-resistant metal material inserted into an inner circumferential surface of the compression chamber. A roller contact member, an upper journal and a lower journal of an engineering plastic material coupled to upper and lower parts of the cylinder body and having a shaft hole formed at the center thereof, and a wear-resistant metal material inserted into an inner circumferential surface of the shaft hole of the upper and lower journals. It is achieved by a cylinder of a hermetic rotary compressor characterized by having a metal bearing of.

Here, it is preferable that a plurality of coupling nuts for inserting bolts of the upper and lower journals are inserted into the circumferential region of the cylinder body.

On the other hand, the object is in accordance with another field of the present invention, a closed rotary type having a cylinder body for forming a compression chamber, and an upper journal and a lower journal coupled to the upper and lower portions of the cylinder body and formed with a shaft hole in the center thereof. A method of manufacturing a cylinder of a compressor, the method comprising: inserting a metal roller forming an inner circumferential surface of the shaft hole and a roller contact member made of metal to form an inner circumferential surface of the compression chamber in an injection mold of the cylinder body and the upper and lower journals. And injection molding the cylinder body and the upper and lower journals by injecting an engineering plastic material into each of the injection molds into which the roller contact member and the metal bearing are inserted, and forming the cylinder body and the upper and A washing step of removing foreign substances from the lower journal; By the method for producing the cylinder of a hermetic rotary compressor comprising the steps of checking and the lower journal is achieved.

Here, in the inserting step, it is preferable that a plurality of coupling nuts for bolt coupling of the upper and lower journals are inserted in the peripheral region of the cylinder body.

In addition, the roller contact member and the inner circumferential surface of the metal bearing, it is effective to further include a machining step for precisely processing the contact surface of the cylinder body and the upper and lower journals.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

5 is an enlarged cross-sectional view of the cylinder installation region of FIG. 1 according to the present invention, FIG. 6 is an enlarged perspective view of the cylinder of FIG. 5, and FIG. 7 is a cylinder cross-sectional view taken along the line VII-VII of FIG. 5. As shown in these drawings, the cylinder 1 of the hermetic rotary compressor according to the present invention has a plastic cylinder body 10, and an upper journal of plastic material coupled to the upper and lower portions of the cylinder body 10 ( 35) and a lower journal (36), and inserts on the inner surface of the shaft contact (35a) of the upper and lower journals (35, 36) and the roller contact member (20) made of metal, which is inserted into the cylinder body (10). It has a metal bearing 50 to be bonded.

The cylinder body 10 is injection molded so that a circular refrigerant compression chamber 11 is formed in a central region and a refrigerant suction port 13 and a vane coupling portion 15 are formed at one side thereof.

The roller contact member 20 is inserted into the inner circumferential surface of the compression chamber 11 of the cylinder body 10 during insert molding of the cylinder body 10, and the upper journal 35 and the lower portion of the cylinder body 10 in the circumferential region of the cylinder body 10. A plurality of coupling nuts 30 are insert-coupled to the bolts 137 of the journal 36. As the material of the cylinder body 10, it is preferable to use engineering plastics such as polyamide, polyacetal, ABS and the like which are excellent in strength, heat resistance, durability and wear resistance.

The upper and lower journals 35 and 36 have a shaft hole 35a through which the rotating shaft 125 of the drive unit 120 of FIG. 1 passes, and a coupling nut of the cylinder body 10 in the circumferential region. Injection molding is performed so that a bolt through hole 35b corresponding to 30 is formed.

On the other hand, the roller contact member 20 is made of an alloy tube material or alloy sintered tube material having excellent durability and wear resistance in consideration of the rolling contact of the compression roller 33, and is inserted into the inner peripheral surface of the compression chamber (11). Then, the coupling nut 30 is provided in the market as a standard product for inserting at the time of molding the cylinder body 10.

At this time, it is preferable that a flow preventing groove (not shown) and / or flow preventing protrusions 21 and 31 are formed on the outer circumferential surfaces of the roller contact member 20 and the coupling nut 30. This is to prevent the random flow and separation of the roller contact member 20 and the coupling nut 30 inserted into the cylinder body 10.

The metal bearing 50 is insert-coupled to the inner circumferential surface of the shaft hole 35a of the upper and lower journals 35 and 36. The metal bearing 50 is preferably made of an alloy tube or alloy sintered tube having excellent durability and wear resistance in consideration of friction with a rotating shaft. It is preferable that a flow preventing groove and / or a flow preventing protrusion 25 are formed on the outer circumferential surface of the metal bearing 50 like the roller contact member.

Each manufacturing process of the cylinder body 10 and the upper and lower journals 35 and 36 constituting the cylinder 1 according to the present invention having such a configuration, the cylinder body 10 prepared in advance, as shown in FIG. And insert part (S01) for inserting parts such as roller contact member (20), coupling nut (30), metal bearing (50) into the injection mold of each journal (35, 36), and cylinder body (10). And a molding step (S02) for injection molding each journal (35,36), a machining step (S03) for processing the molded cylinder body (10) and each journal (35,36), and a washing step (S04). ) And the inspection process (S050).

Molding process (S02) is a high-temperature and high-pressure engineering plastic material in the mold of the cylinder body 10 or each journal (35, 36) in which the roller contact member 20 and the coupling nut 30 or the metal bearing 50 is inserted By injection into the cylinder body 10 or the journals 35 and 36.

In addition, the machining step S03 processes the contact surfaces of the upper and lower surfaces of the cylinder body 10 and the journals 35 and 36 in contact with the upper and lower surfaces of the cylinder body 10 (S03a), The inner peripheral surface of the roller contact member 20 inserted into the cylinder body 10 and the inner peripheral surface of the metal bearing 50 are precisely processed (S03b).

Here, the surface processing of the upper and lower surfaces of the cylinder 1 and the contact surfaces of the respective journals 35 and 36 is performed when the journal body 35 and the respective journals 35 and 36 are combined. The sealing surface of the gasket (not shown) interposed between the 36 and the cylinder body 10 is secured.

In addition, although the inner circumferential surface processing of the roller contact member 20 and the metal bearing 50 may be processed in advance before insert injection, it is necessary to process after injection in consideration of deformation of parts according to the injection environment such as high temperature generated during injection. desirable.

The cylinder body 10 and the journals 35 and 36 which have been subjected to the machining step S03 are shipped to the finished product after the product washing S04 and the inspection S05.

The cylinder 1 of the hermetic rotary compressor according to the present invention having the structure and manufacturing process as described above is injection molded using the engineering body, and the cylinder body 10 and each journal 35 and 36, As compared to 1, compared to the cylinder 130 of the conventional metal casting, the manufacturing cost is cheap, the manufacturing process is simple, and mass production is easy.

TABLE-1

Conventional compressor cylinder manufacturing method Compressor cylinder manufacturing method according to the present invention Process Name Process time (seconds) Process Name Process time (seconds) Template 90 Component insert One Raw material melting 78 Block Injection Molding 6 Casting molding 65 Block processing 19 thought 14 wash 6 inspection 7 inspection 6 Basic processing 8 Shipment 3 Reference surface primary machining 16 Burr removal 6 inspection 7 Joining surface machining 16 Thread turning 15 Thread Drilling 13 Threader tapping 18 Burr removal 6 Shaft Turning 21 Shaft Boring 26 Axis ball honing 28 Burr removal 6 Compression chamber processing 23 Compression Chamber Turning 28 Compression Seal Boring 27 Compression Chamber Honing 29 Burr removal 6 Reference surface secondary processing 14 Reference surface grinding 17 wash 5 Inspection, shipment 3 system 592 seconds / EA system 41 seconds / EA Daily output (based on 24HR) 145.5 EA Daily output (based on 24HR) 2,107.3 EA Monthly production (based on 24 days) 3,491 EA Monthly production (based on 24 days) 50,575 EA Annual output (25 days) 41,892 EA Annual output (25 days) 606,907 EA

In addition, since the weight of the cylinder body 10 and the journals 35 and 36 can be remarkably reduced in weight, it is easy to manage products such as transportation and assembly.

In addition, the roller contact member and the metal bearing 50 are insert-coupled in the injection molding of the cylinder body 10 and each journal 35 and 36, and the cylinder body 10 and each journal 35 and 36 are coupled to each other. Since the coupling nut 30 for the insert is inserted, as shown in FIG. 8 and Table-1, the complicated post-processing step is greatly reduced. This reduces the manufacturing cost and facilitates mass production.

In addition, by inserting the roller contact member 20 and the metal bearing 50 having excellent durability and wear resistance into the compression chamber of the cylinder body 10 and the shaft hole 35a of each journal 35 and 36, respectively, The inner circumferential surface of the compression chamber and the shaft hole 35a due to the rolling contact of the rotating shaft can be minimized. As a result, compressor performance is improved, such as improvement in compression efficiency, noise reduction, and device life extension.

In this way, the cylinder body constituting the cylinder and the upper and lower journals are injection-molded with engineering plastic, and roller contact members and metal bearings having excellent wear resistance of metal materials are respectively provided on the inner circumferential surface of the compression chamber of the cylinder body and the inner circumferential surface of the shaft hole of each journal. By insert inserts, a closed rotary compressor cylinder is provided that facilitates manufacturing and mass production, reduces manufacturing costs, reduces the weight of the product, provides excellent durability and wear resistance, and improves the performance of the compressor.

As described above, according to the present invention, the production and mass production is easy, the production cost is reduced, the weight of the product can be reduced, the management is easy, the durability and wear resistance is excellent, and the performance of the compressor can be improved Provided are a cylinder of a hermetic rotary compressor and a method of manufacturing the same.

Claims (5)

In the cylinder of the hermetic rotary compressor, A cylinder body made of an engineering plastic material having a compression chamber accommodating a compression roller in a central region thereof; A roller contact member made of a wear-resistant metal material inserted into an inner circumferential surface of the compression chamber; The upper journal and the lower journal of the engineering plastic material is coupled to the cylinder body upper and lower and the shaft hole is formed in the center, Sealed rotary compressor cylinder characterized in that it has a metal bearing of the wear-resistant metal material is inserted into the inner circumferential surface of the shaft hole of the upper and lower journals. The method of claim 1, The circumferential region of the cylinder body is a cylinder of a hermetic rotary compressor, characterized in that a plurality of coupling nuts for inserting the bolts of the upper and lower journals are inserted. In the cylinder manufacturing method of a closed rotary compressor having a cylinder body forming a compression chamber, and an upper journal and a lower journal coupled to upper and lower portions of the cylinder body and having shaft holes formed in the center thereof, Inserting a roller contact member made of metal to form the inner circumferential surface of the compression chamber and a metal bearing forming the inner circumferential surface of the shaft hole in the injection mold of the cylinder body and the upper and lower journals prepared in advance; Injection molding the cylinder body and the upper and lower journals by injecting an engineering plastic material into each injection mold into which the roller contact member and the metal bearing are inserted; A washing step of removing foreign substances from the molded cylinder body and the upper and lower journals; Method for manufacturing a cylinder of the hermetic rotary compressor comprising the step of inspecting the molded cylinder body and the upper and lower journals. The method of claim 3, In the insert step, the cylinder manufacturing method of a hermetic rotary compressor, characterized in that a plurality of coupling nuts for bolt coupling of the upper and lower journals are inserted in the peripheral region of the cylinder body. The method according to claim 3 or 4, And a machining step of precisely machining the roller contact member and the inner circumferential surface of the metal bearing and the contact surface of the cylinder body and the upper and lower journals.

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