JP2006002731A - Enclosed compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an enclosed compressor which solves the problem that there is a high possibility of deformation of a crankshaft due to a press fitting because a press fitting is carried out to insert and secure an oil pump case for an enclosed compressor to a crankshaft, and thus fear about an adverse effect on the reliability of the sliding section of the crankshaft, and that there is possibility of a falling-out of the oil pump case when a spring nature is given to secure it to the crankshaft. <P>SOLUTION: The enclosed compressor is constructed such that a notch is prepared at the insertion end into the crankshaft of the oil pump case. This makes it easy to insert the oil pump case into the crankshaft, allows for a drastic reduction in a press fitting load, thus does not deform the crankshaft, and prevents the oil pump case from falling out. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor provided with an oil pump that sucks up oil at the bottom of a container through an oil supply hole in a vertically arranged crankshaft and supplies the oil to a compression mechanism, and in particular, an oil pump case at the lower end of the oil supply hole. The present invention relates to a hermetic compressor having an improved structure.

  FIG. 6 is a longitudinal sectional view showing a conventional hermetic compressor. The compressor shown in FIG. 6 includes a sealed container 1 whose bottom portion forms an oil reservoir 8. In the container 1, the compression mechanism unit 3 is provided on the oil reservoir 8, and the electric motor unit 2 is provided above the compression mechanism unit 3. A crankshaft 4 that passes through the compression mechanism 3 and is arranged vertically in the container 1 is also provided. The upper part of the crankshaft 4 is connected to a rotor 22 constituting the electric motor unit 2. The crankshaft 4 has an oil supply hole 40 that passes through the center. An oil pump member 5 is provided in the oil supply hole 40 in the lower portion of the crankshaft 4. The oil pump member 5 has a function of sucking up the oil in the oil reservoir 8 and supplying it to the compression mechanism unit 3 as the crankshaft 4 rotates.

  An oil pump case 6 is provided for extending the oil suction position downward from the lower end of the oil supply hole 40 of the crankshaft 4 in response to the increase in the depth of the oil reservoir 8. The base end portion of the oil pump case 6 is inserted into the lower end portion of the oil supply hole 40, and the tip end portion has an opening 62 a in the oil in the oil reservoir 8.

Conventionally, the oil pump case 6 of the copper pipe member is inserted and fixed by press-fitting into the oil supply hole 40 of the crankshaft 4 or is formed by winding a metal leaf spring material. The screw 6 was inserted into the oil supply hole 40 of the crankshaft 4. (For example, see Patent Document 1 and Patent Document 2)
Japanese Utility Model Publication No. 62-190879 JP 2000-249064 A

  However, in the oil pump case 6 of the copper pipe member of the hermetic compressor shown in FIG. 7 described in Patent Document 1, since it is inserted and fixed to the oil supply hole 40 of the crankshaft 4 by press fitting, the press fitting Therefore, there is a high risk of the crankshaft 4 being deformed, and there is a concern about the influence on the reliability of the sliding portion of the crankshaft 4.

  Further, in the oil pump case 6 formed by winding the metal plate spring material shown in FIG. 8 described in Patent Document 2, the oil supply hole 40 of the crankshaft 4 is inserted due to the spring property. Therefore, there is a risk of falling out.

  The present invention solves the above-described conventional problems. When the oil pump case 6 is inserted into the oil supply hole 40 of the crankshaft 4, the crankshaft 4 is not deformed and the oil pump case is provided. An object of the present invention is to provide a highly reliable and high-quality hermetic compressor in which 7 does not fall out.

In order to solve the above-mentioned problem, the means according to claim 1 of the present invention includes a container having an oil reservoir at the bottom, a compression mechanism portion provided on the oil reservoir in the container, and the compression mechanism. A crankshaft that is vertically disposed in the container through the portion and has an oil supply hole that passes through the center portion, and is provided in the oil supply hole of the crankshaft, and the oil reservoir is provided as the crankshaft rotates. An oil pump member for sucking up and supplying the oil to the compression mechanism portion, a base end portion which is inserted into a lower end portion of the oil supply hole of the crankshaft and receives a lower portion of the oil pump member, and the oil reservoir In the hermetic compressor having an oil pump case having a tip portion opened in the oil inside, a notch is provided at the end of the oil pump case inserted into the crankshaft. A hermetic compressor according to symptoms.

  As a result, the press-fitting load can be greatly reduced, so that the crankshaft can be prevented from being deformed by press-fitting and can be prevented from falling off.

  According to a second aspect of the present invention, the length L of the notch portion of the oil pump case is greater than the insertion hole length a at the lower end portion of the oil supply hole of the crankshaft. It is small.

  As a result, the press-fitting load can be greatly reduced, so that the crankshaft can be prevented from being deformed by press-fitting and can be prevented from falling off.

  The oil pump case for a hermetic compressor according to the present invention is such that when the oil pump case is inserted into the oil supply hole of the crankshaft, the crankshaft is not deformed and the oil pump case falls off. Therefore, it is possible to provide a high-quality hermetic compressor with no reliability.

  According to a first aspect of the present invention, there is provided a sealed container having an oil reservoir at the bottom, a compressor mechanism provided on the oil reservoir in the sealed container, and penetrating the compression mechanism section into the sealed container. A crankshaft that is vertically disposed and has an oil supply hole that passes through a central portion thereof, and is provided in the oil supply hole of the crankshaft. The compression mechanism sucks up oil in the oil reservoir as the crankshaft rotates. An oil pump member for supplying to the portion, a base end portion that is inserted into the lower end portion of the oil supply hole of the crankshaft and receives a lower portion of the oil pump member, and a tip end portion that is open into the oil in the oil reservoir. In the hermetic compressor provided with the pump case having the above, the press-fit load can be greatly reduced by providing the notch portion at the end portion of the pump case inserted into the crankshaft. Because, it is possible to prevent the can to prevent deformation of the crankshaft, and fall out by press-fitting.

  In the second invention, in particular, the relationship between the length L of the notch portion of the oil pump case of the first invention and the insertion hole length a of the lower end portion of the oil supply hole of the crankshaft is expressed by the relational expression L <a By configuring, the same effect as the first invention can be obtained.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. In FIG. 1, the compressor includes a sealed container 1 whose bottom portion forms an oil reservoir 8. In the container 1, the compression mechanism unit 3 is provided on the oil reservoir 8, and the electric motor unit 2 is provided above the compression mechanism unit 3. A crankshaft 4 that passes through the compression mechanism 3 and is arranged vertically in the container 1 is also provided.

The upper part of the crankshaft 4 is connected to a rotor 22 constituting the electric motor unit 2.
The crankshaft 4 has an oil supply hole 40 that passes through the center. The compression mechanism unit 3 includes a cylinder 30 and a roller 32 provided in the cylinder 30. The roller 32 is attached to the outer periphery of an eccentric crank portion 42 (see FIG. 2) formed on the crankshaft 4 and rolls on the inner wall of the cylinder 30 as the crankshaft 4 rotates. A main bearing 34 and a sub-bearing 36 that support the crankshaft 4 are provided across the upper and lower sides of the cylinder 30. An oil pump member 5 is provided in the oil supply hole 40 in the lower portion of the crankshaft 4.

  The oil pump member 5 has a function of sucking up the oil in the oil reservoir 8 and supplying it to the compression mechanism unit 3 as the crankshaft 4 rotates. The compressor of the present embodiment corresponds to an increase in the depth of the oil reservoir 8 and an oil pump case for extending the oil suction position downward from the lower end of the oil supply hole 40 of the crankshaft 4. 6 is provided.

  As shown in FIG. 2, the oil pump case 6 is inserted into the lower end portion of the oil supply hole 40 of the crankshaft 4 to receive the lower portion 50 of the oil pump member 5, and the oil pump case 6 And a front end 62 that opens into the oil.

  In the hermetic compressor configured as described above, the shape of the oil pump case 6 has a notch portion at the end portion inserted into the oil supply hole 40 in the lower portion of the crankshaft 4 as shown in FIG. 7 is formed in the shape provided.

  As described above, in the present embodiment, the oil pump case into the oil supply hole 40 of the crankshaft 4 is provided by providing the cutout portion 7 at the end of the insertion portion of the oil pump case 6 into the crankshaft 4. -Since the insertion of the case 6 can be facilitated and the press-fit load can be greatly reduced, the crankshaft is not deformed, and the oil pump case 6 does not fall out. A hermetic compressor can be provided.

(Embodiment 2)
FIG. 4 is a longitudinal sectional view of a hermetic compressor according to the second embodiment of the present invention. In FIG. 4, the compressor includes a sealed container 1 whose bottom part forms an oil reservoir 8. In the container 1, the compression mechanism unit 3 is provided on the oil reservoir 8, and the electric motor unit 2 is provided above the compression mechanism unit 3. A crankshaft 4 that passes through the compression mechanism 3 and is arranged vertically in the container 1 is also provided. The upper part of the crankshaft 4 is connected to a rotor 22 constituting the electric motor unit 2. The crankshaft 4 has an oil supply hole 40 that passes through the center. The compression mechanism unit 3 includes a cylinder 30 and a roller 32 provided in the cylinder 30. The roller 32 is attached to the outer periphery of an eccentric crank portion 42 (see FIG. 2) formed on the crankshaft 4 and rolls on the inner wall of the cylinder 30 as the crankshaft 4 rotates. A main bearing 34 and a sub-bearing 36 that support the crankshaft 4 are provided across the upper and lower sides of the cylinder 30. An oil pump member 5 is provided in the oil supply hole 40 in the lower portion of the crankshaft 4. The oil pump member 5 has a function of sucking up the oil in the oil reservoir 8 and supplying it to the compression mechanism unit 3 as the crankshaft 4 rotates. The compressor of the present embodiment corresponds to an increase in the depth of the oil reservoir 8 and an oil pump case for extending the oil suction position downward from the lower end of the oil supply hole 40 of the crankshaft 4. 6 is provided. As shown in FIG. 5, the oil pump case 6 is inserted into the lower end portion of the oil supply hole 40 of the crankshaft 4 and receives a lower end portion 50 of the oil pump member 5. And a front end 62 that opens into the oil.

In the hermetic compressor configured as described above, the shape of the oil pump case 6 has a notch portion at the end inserted into the oil supply hole 40 in the lower portion of the crankshaft 4 as shown in FIG. 7 is provided, and the relationship between the length L of the notch and the insertion hole length a of the lower end of the oil supply hole of the crankshaft is configured by the relational expression of L <a. Similar effects can be obtained.

  As described above, the oil pump case for a hermetic compressor in the present invention can be applied to all vertical hermetic compressors such as a reciprocating type regardless of the rotary type.

1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. The figure which shows the state before insertion of the crankshaft of the compressor shown in FIG. 1, an oil pump member, and an oil pump case. Sectional view of the oil pump case for the hermetic compressor shown in FIG. Longitudinal sectional view of a hermetic compressor according to a second embodiment of the present invention Installation drawing of oil pump case for hermetic compressor shown in FIG. Longitudinal sectional view showing a conventional hermetic compressor Installation drawing of conventional oil pump case for hermetic compressor Installation drawing of conventional oil pump case for hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor part 22 Rotor 3 Compression mechanism part 30 Cylinder 32 Roller 34 Main bearing 36 Sub bearing 4 Crankshaft 40 Oil supply hole 5 Oil pump 50 Lower part of oil pump 6 Oil pump case 60 Oil pump Base end portion of the case 62 Front end portion of the oil pump case 62a Opening portion 7 Notch portion of the oil pump case 8 Oil sump

Claims (2)

An airtight container having an oil sump at the bottom, a compressor mechanism provided on the oil sump in the airtight container, and vertically disposed in the airtight container through the compression mechanism. A crankshaft having an oil supply hole passing through the central portion, and an oil supply hole provided in the oil supply hole of the crankshaft, for sucking up the oil in the oil reservoir and supplying the oil to the compression mechanism portion as the crankshaft rotates. An oil pump member having an oil pump member, a base end portion that is inserted into a lower end portion of the oil supply hole of the crankshaft and receives a lower portion of the oil pump member, and a distal end portion that opens into the oil in the oil reservoir. A hermetic compressor provided with a notch at the end of the oil pump case inserted into the crankshaft. 2. The hermetic compressor according to claim 1, wherein the length of the cutout portion of the oil pump case is smaller than the length of the insertion hole at the lower end portion of the oil supply hole of the crankshaft.

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