JP2017218951A - Compressor comprising sliding bearings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain damage to a compressor caused by seizure at places where sliding bearings and a crankshaft slide on each other, even if supply of lubricating oil is insufficient.SOLUTION: A compressor 10 is intended for a refrigerating machine. The compressor 10 comprises a crankshaft 30, a first bearing 41, a second bearing 42, and a third bearing 43. The crankshaft 30 comprises a finished surface. Surface roughness Ra of the finished surface is 0.05 μm or less. The first bearing 41, the second bearing 42, and the third bearing 43 are installed so as to slide on the crankshaft 30, and includes an aluminum based alloy.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor having a slide bearing.

  The compressor mounted in the refrigeration apparatus has a crankshaft and a slide bearing that supports the crankshaft as seen in Patent Document 1 (Japanese Patent Laid-Open No. 2011-1854). Lubricating oil is supplied to the slide bearing to form an oil film, which smoothens the rotation of the crankshaft.

  In the transient operation of the compressor, for example, the operation immediately after the start-up, the supply of the lubricating oil to the portion where the crankshaft and the slide bearing slide relative to each other may be insufficient. In this case, seizure may occur in at least one of the slide bearing and the crankshaft due to the rotation of the crankshaft.

  An object of the present invention is to suppress damage to a compressor caused by seizure of a portion where a sliding bearing and a crankshaft slide with each other even when the supply of lubricating oil becomes insufficient.

  The compressor according to the first aspect of the present invention is for a refrigeration machine. The compressor includes a crankshaft and a plain bearing. The crankshaft has a finished surface. The finished surface has a surface roughness of 0.05 μm or less. The plain bearing is installed so as to slide with the crankshaft and includes an aluminum-based alloy.

  According to this configuration, the finished surface of the crankshaft is smooth, and the slide bearing is made of a material that smoothly slides. Therefore, seizure of the slide bearing or the crankshaft is suppressed.

  The compressor according to the second aspect of the present invention is the compressor according to the first aspect, wherein the surface roughness is 0.03 μm or less.

  According to this configuration, the finished surface of the crankshaft is extremely smooth. Therefore, the sliding between the crankshaft and the slide bearing becomes smoother, and seizure of the slide bearing or the crankshaft is further suppressed.

A compressor according to a third aspect of the present invention is the compressor according to the first aspect or the second aspect,
The crankshaft includes S55C.

  According to this configuration, the material of the crankshaft is S55C which is a kind of coalbed steel and has high hardness. Therefore, the sliding between the crankshaft and the slide bearing becomes smoother, and seizure of the slide bearing or the crankshaft is further suppressed.

  The compressor concerning the 4th viewpoint of the present invention is a compressor concerning any one of the 1st viewpoint to the 3rd viewpoint, and an aluminum system alloy contains all copper, tin, silicon, and aluminum.

  According to this configuration, the plain bearing is made of an alloy containing all of copper, tin, silicon, and aluminum. Therefore, seizure of the slide bearing or the crankshaft is further suppressed. Preferably, the weight ratio of each component of the aluminum-based alloy is copper: tin: silicon: aluminum = 1%: 12%: 3%: 84%. In the case of this weight ratio, image sticking is further suppressed.

  A compressor according to a fifth aspect of the present invention is the compressor according to any one of the first to fourth aspects, further comprising a crankshaft, a sliding bearing, and a pressure vessel that houses a refrigerant. . The refrigerant contacts the crankshaft.

  According to this configuration, the refrigerant contacts the crankshaft. Therefore, seizure is suppressed even in an environment where sliding portions of the slide bearing and the crankshaft are exposed to the refrigerant.

  The compressor which concerns on the 6th viewpoint of this invention is a compressor which concerns on any one of a 1st viewpoint to the 5th viewpoint, and is further provided with a lubricating oil storage part and a lubricating oil supply mechanism. The lubricating oil reservoir stores the lubricating oil. The lubricating oil supply mechanism supplies lubricating oil to the slide bearing.

  According to this configuration, the lubricating oil is supplied to the sliding portions of the slide bearing and the crankshaft. Therefore, the seizure of the sliding portion is further suppressed.

  The manufacturing method according to the seventh aspect of the present invention is a method for manufacturing a compressor for a refrigeration machine. The manufacturing method includes a step of preparing a crankshaft having a finished surface having a surface roughness of 0.05 μm or less, a step of preparing a slide bearing including an aluminum alloy, and sliding the crankshaft and the slide bearing relative to each other. Installing.

  According to this method, the finished surface of the crankshaft is smooth, and the slide bearing is made of a material that smoothly slides. Therefore, seizure of the slide bearing or the crankshaft is suppressed in the manufactured compressor.

  The manufacturing method according to an eighth aspect of the present invention is the manufacturing method according to the seventh aspect, wherein the finished surface is formed by precision shot peening.

  According to this method, the finished surface of the crankshaft is processed by precision shot peening. Therefore, the surface roughness of the finished surface can be made fine.

  The manufacturing method according to the ninth aspect of the present invention is the manufacturing method according to the seventh aspect or the eighth aspect, wherein the surface roughness is 0.03 μm or less.

  According to this method, the surface roughness of the finished surface of the crankshaft is extremely smooth. Accordingly, since the sliding of the crankshaft and the slide bearing becomes smoother in the manufactured compressor, seizure of the slide bearing or the crankshaft is further suppressed.

  A manufacturing method according to a tenth aspect of the present invention is the manufacturing method according to any one of the seventh to ninth aspects, wherein the aluminum-based alloy includes all of copper, tin, silicon, and aluminum.

  According to this method, the plain bearing is made of an alloy containing all of copper, tin, silicon, and aluminum. Therefore, seizure of the slide bearing or the crankshaft is further suppressed. Preferably, the weight ratio of each component of the aluminum-based alloy is copper: tin: silicon: aluminum = 1%: 12%: 3%: 84%. In the case of this weight ratio, image sticking is further suppressed.

  According to the compressor according to the first aspect of the present invention, seizure of the slide bearing or the crankshaft is suppressed.

  According to the manufacturing method according to the seventh aspect of the present invention, seizure of the slide bearing or the crankshaft is suppressed in the manufactured compressor.

It is sectional drawing of the compressor 10 which concerns on one Embodiment of this invention. FIG. 4 is a schematic diagram illustrating a structure of a peripheral portion of a first bearing 41 in the compressor 10.

  Hereinafter, embodiments of an air conditioner according to the present invention will be described with reference to the drawings. In addition, the specific structure of the air conditioning apparatus concerning this invention is not restricted to the following embodiment, In the range which does not deviate from the summary of invention, it can change suitably.

(1) Overall Configuration FIG. 1 shows a compressor 10 according to an embodiment of the present invention. The compressor 10 is mounted in a refrigerant circuit of a refrigeration machine such as an air conditioner, and sucks and compresses low-pressure gas refrigerant and discharges high-pressure gas refrigerant. The compressor 10 includes a pressure vessel 11, a motor 20, a crankshaft 30, a compression element 50, a first bearing 41, a second bearing 42, a third bearing 43, a first support member 70, and a second support member 79.

(2) Detailed configuration (2-1) Pressure vessel 11
The pressure vessel 11 houses the components of the compressor 10 and the refrigerant, and has a strength that can withstand the high pressure of the refrigerant. A suction pipe 15 for sucking low-pressure gas refrigerant and a discharge pipe 16 for discharging high-pressure gas refrigerant are attached to the pressure vessel 11. The bottom of the pressure vessel 11 is provided with a lubricating oil reservoir 18 for storing lubricating oil.

(2-2) Motor 20
The motor 20 receives power supply and generates power for the compression element 50. The motor 20 has a stator 21 and a rotor 22. The stator 21 is fixed directly or indirectly to the pressure vessel 11. The rotor 22 can rotate by performing a magnetic interaction with the stator 21.

(2-3) Crankshaft 30
The crankshaft 30 transmits power generated by the motor 20 to the compression element 50. The crankshaft 30 is fixed to the rotor 22 and rotates together with the rotor 22. The crankshaft 30 has a main shaft portion 31 and an eccentric portion 32. The main shaft portion 31 has a cylindrical shape centering on the rotation axis of the crankshaft 30. The eccentric portion 32 is eccentric with respect to the rotation axis of the crankshaft 30. The crankshaft 30 is in contact with a gas refrigerant that fills the inside of the pressure vessel 11.

  The crankshaft 30 is provided with a lubricating oil supply mechanism 34. The lubricating oil supply mechanism 34 supplies lubricating oil to each part of the compressor 10. The lubricating oil supply mechanism 34 includes a lubricating oil pumping mechanism 35 and a lubricating oil supply passage 36.

  The lubricating oil pumping mechanism 35 is provided in the lower part of the crankshaft 30. The lubricating oil pumping mechanism 35 is a mechanism for pumping lubricating oil from the lubricating oil reservoir 18. The lubricating oil pumping mechanism 35 uses the rotation of the crankshaft 30 for pumping operation.

  The lubricating oil supply passage 36 is formed inside the crankshaft 30. The lubricating oil pumped up by the lubricating oil pumping mechanism 35 rises through the lubricating oil supply passage 36. Thereafter, the lubricating oil is supplied to the compression element 50, the first bearing 41, the second bearing 42, and the third bearing 43, and lubricates these sliding portions. Finally, the lubricating oil descends along the surface of the crankshaft 30 and other paths and returns to the lubricating oil reservoir 18.

(2-4) Compression element 50
The compression element 50 is a mechanism that compresses the gas refrigerant. The compression element 50 has a fixed scroll 51 and a movable scroll 52. The fixed scroll 51 is fixed to the pressure vessel 11. The movable scroll 52 can revolve with respect to the fixed scroll. A compression chamber 53 is defined by the fixed scroll 51 and the movable scroll 52. As the movable scroll 52 revolves, the volume of the compression chamber 53 varies, and the gas refrigerant is compressed. The high-pressure gas refrigerant that has undergone the compression process is discharged from the compression element 50 and finally discharged from the discharge pipe 16 to the outside of the pressure vessel 11.

(2-5) First bearing 41, first support member 70
The first bearing 41 is a slide bearing that pivotally supports the main shaft portion 31. The first bearing 41 is supported by the first support member 70. The first support member 70 is fixed directly or indirectly to the pressure vessel 11. The first support member 70 supports the fixed scroll 51 directly or indirectly.

(2-6) Second bearing 42, second support member 79
The second bearing 42 is also a sliding bearing that pivotally supports the main shaft portion 31. The second bearing 42 is supported by a second support member 79. The second support member 79 is directly or indirectly fixed to the pressure vessel 11.

(2-7) Third bearing 43
The third bearing 43 is a slide bearing that pivotally supports the eccentric portion 32. The third bearing 43 is installed on the movable scroll 52. The eccentric scroll 32 rotates eccentrically while sliding with the third bearing 43, so that the movable scroll 52 can make a revolving motion.

(3) Shaft Support Structure FIG. 2 shows the structure of the peripheral portion of the first bearing 41 in the compressor 10. A smooth finished surface 39 is provided on the surface of the crankshaft 30. When the crankshaft 30 rotates, the finished surface 39 slides with the first bearing 41.

  The material of the crankshaft 30 includes S55C which is a kind of carbon steel and has high hardness.

  The finished surface 39 of the crankshaft 30 is formed to have a surface roughness Ra of 0.05 μm or less. It is more preferable that the surface roughness Ra is 0.03 μm or less.

  The material of the first bearing 41 includes an aluminum-based alloy. Preferably, the aluminum alloy includes all of copper, tin, silicon, and aluminum. Preferably, the weight ratio of each component of the aluminum-based alloy is copper: tin: silicon: aluminum = 1%: 12%: 3%: 84%.

  The shaft support structure of the second bearing 42 and the third bearing 43 is also formed to achieve the same conditions as the shaft support structure of the first bearing 41 described above.

(4) Manufacturing method The compressor 10 which concerns on this invention is manufactured by the manufacturing method which consists of the following steps.

(4-1) Step of preparing crankshaft 30 The crankshaft 30 is prepared. The finished surface 39 of the crankshaft 30 is formed to have a surface roughness Ra of 0.05 μm or less. It is more preferable that the surface roughness Ra is 0.03 μm or less. The finished surface 39 is formed by precision shot peening.

(4-2) Preparation Steps for the First Bearing 41, the Second Bearing 42, and the Third Bearing 43 The first bearing 41, the second bearing 42, and the third bearing 43 are prepared. These bearings are sliding bearings, and the material thereof includes an aluminum-based alloy. Preferably, the aluminum alloy includes all of copper, tin, silicon, and aluminum. Preferably, the weight ratio of each component of the aluminum-based alloy is copper: tin: silicon: aluminum = 1%: 12%: 3%: 84%.

(4-3) Assembly Step of the Shaft Support Structure The prepared crankshaft 30 is installed so as to slide with each of the first bearing 41, the second bearing 42, and the third bearing 43.

(5) Features (5-1)
The surface roughness Ra of the finished surface 39 of the crankshaft 30 is 0.05 μm or less. The first bearing 41, the second bearing 42, and the third bearing 43 are sliding bearings containing an aluminum alloy. According to this configuration, the finished surface 39 of the crankshaft 30 is smooth, and the first bearing 41, the second bearing 42, and the third bearing 43 are made of a material that smoothly slides. Therefore, the seizure at the place where the first bearing 41, the second bearing 42, or the third bearing 43 and the crankshaft 30 slide with each other is suppressed.

(5-2)
The surface roughness Ra of the finished surface 39 of the crankshaft 30 may be 0.03 μm or less. According to this configuration, the finished surface 39 of the crankshaft 30 is extremely smooth. Accordingly, since the sliding of the crankshaft 30 with the first bearing 41, the second bearing 42, and the third bearing 43 becomes smoother, the first bearing 41, the second bearing 42, or the third bearing 43 and the crankshaft 30 Burn-in at the locations where the two slide relative to each other is further suppressed.

(5-3)
The material of the crankshaft 30 is S55C which is a kind of coalbed steel and has high hardness. Accordingly, since the sliding of the crankshaft 30 with the first bearing 41, the second bearing 42, and the third bearing 43 becomes smoother, the first bearing 41, the second bearing 42, or the third bearing 43 and the crankshaft 30 Burn-in at the locations where the two slide relative to each other is further suppressed.

(5-4)
The material of the first bearing 41, the second bearing 42, and the third bearing 43 is an alloy containing all of copper, tin, silicon, and aluminum. Therefore, the seizure at the place where the first bearing 41, the second bearing 42, or the third bearing 43 and the crankshaft 30 slide with each other is further suppressed. When the weight ratio of each component of the aluminum-based alloy is copper: tin: silicon: aluminum = 1%: 12%: 3%: 84%, seizure is further suppressed.

(5-5)
The refrigerant contacts the crankshaft 30 in the internal space of the pressure vessel 11. Therefore, seizure is suppressed even in an environment where the sliding portions of the first bearing 41, the second bearing 42, the third bearing 43, and the crankshaft 30 are exposed to the refrigerant.

(5-6)
The lubricating oil supply mechanism 34 supplies the lubricating oil to the first bearing 41, the second bearing 42, and the third bearing 43. According to this configuration, the lubricating oil is supplied to the sliding portions of the first bearing 41, the second bearing 42, the third bearing 43, and the crankshaft 30. Therefore, the seizure of the sliding portion is further suppressed.

(5-7)
According to the manufacturing method according to the present invention, the finished surface 39 of the crankshaft 30 is processed by precision shot peening. Therefore, the surface roughness Ra of the finished surface 39 can be reduced.

(6) Modification In the above embodiment, all of the first bearing 41, the second bearing 42, and the third bearing 43 are formed so as to achieve the conditions described above in the section “(3) Axial support structure”. . Instead, a part of the first bearing 41, the second bearing 42, and the third bearing 43 may be formed to achieve the condition.

DESCRIPTION OF SYMBOLS 10 Compressor 11 Pressure vessel 15 Intake pipe 16 Discharge pipe 18 Lubricating oil storage part 20 Motor 21 Stator 22 Rotor 30 Crankshaft 31 Main shaft part 32 Eccentric part 34 Lubricating oil supply mechanism 35 Lubricating oil pumping mechanism 36 Lubricating oil supply path 39 Finish surface 41 first bearing 42 second bearing 43 third bearing 50 compression element 51 fixed scroll 52 movable scroll

JP 2011-1854 A

Claims (10)

A crankshaft (30) having a finished surface (39) having a surface roughness (Ra) of 0.05 μm or less;
Sliding bearings (41 to 43) installed so as to slide with the crankshaft and containing an aluminum-based alloy;
A compressor (10) for a refrigeration machine. The surface roughness is 0.03 μm or less,
The compressor according to claim 1. The crankshaft includes S55C.
The compressor according to claim 1 or 2. The aluminum-based alloy includes all of copper, tin, silicon, and aluminum.
The compressor according to any one of claims 1 to 3. A pressure vessel (11) containing the crankshaft, the plain bearing, and the refrigerant;
Further comprising
The refrigerant contacts the crankshaft;
The compressor according to any one of claims 1 to 4. A lubricating oil reservoir (18) for storing lubricating oil;
A lubricating oil supply mechanism (34) for supplying the lubricating oil to the sliding bearing;
Further comprising
The compressor according to any one of claims 1 to 5. Providing a crankshaft (30) having a finished surface (39) having a surface roughness (Ra) of 0.05 μm or less;
Preparing a plain bearing (41-43) containing an aluminum-based alloy;
Installing the crankshaft and the plain bearing to slide relative to each other;
The manufacturing method of the compressor (10) for refrigeration machines containing this. The finished surface is formed by precision shot peening,
The manufacturing method of the compressor for refrigeration machines of Claim 7. The surface roughness is 0.03 μm or less,
The manufacturing method of Claim 7 or 8. The aluminum-based alloy includes all of copper, tin, silicon, and aluminum.
The manufacturing method according to any one of claims 7 to 9.

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