JP2017141724A - Hermetic type compressor and apparatus including the same - Google Patents

Abstract

The height dimension of a compressor is reduced.
A hermetic compressor including a rotatable main shaft portion, a fixed piece having a spiral groove and a spiral convex portion, and a support member, wherein the fixed piece is a spiral groove or convex portion. In a region where the portion is provided, a mounting portion to which the supporting portion is attached is provided.
[Selection] Figure 2a

Description

  The present disclosure relates to a hermetic compressor and a device including the same.

  A device equipped with a compressor includes a space for storing a part or all of the elements of a thermal cycle including the compressor, for example. As an example of a device, a refrigerator is generally provided with a machine room for storing a compressor, a blower, a condenser, and the like for the purpose of improving the volume of a storage room for storing food and the like. The height dimension of the machine room largely depends on the height dimension of the compressor that tends to be the tallest among the components to be stored. Therefore, if the height dimension of the compressor can be reduced, It is easy to increase the volume of the storage room, and improvement in storage efficiency is expected.

  In Patent Document 1, a sleeve 19 is provided at the tip of the crankshaft 12, a fixed piece 21 having a spiral groove 25 is provided inside the sleeve 19, and a wire-like support member 22 is attached to a protrusion 34 positioned at the lower end of the fixed piece 21. It is inserted (Fig. 2, 0019 etc.).

Japanese Patent Laying-Open No. 2015-094224

  In Patent Document 1, when the support member 22 is inserted through the protrusion 34, the protrusion 34 is not a constituent element of the viscous pump, and thus hardly contributes to pumping up the lubricating oil. For this reason, in addition to the dimension of the member which comprises a viscous pump, the dimension of the protrusion part 34 which fixes the supporting member 22 is required for the vertical dimension of the fixed piece 21, for example. For this reason, the vertical dimension of the compressor tends to be long, and there is room for improvement in reducing the height dimension of the compressor.

  The present invention made in view of the above circumstances is a hermetic compressor including a rotatable main shaft portion, a fixed piece having a spiral spiral groove and a spiral projection, and a support member, The fixed piece has an attached portion to which the support portion is attached in a region where the spiral groove or the convex portion is provided.

  According to the present invention, the height dimension of the compressor can be reduced.

Longitudinal sectional view of the hermetic compressor of Example 1 1 is an enlarged view of the main part of FIG. The figure which expanded the supporting member and the to-be-attached part from FIG. 2a. (A) The enlarged view of the fixed piece vicinity of Example 1, (b) The figure which showed the comparative example Front view of support member Vertical section of a refrigerator equipped with a hermetic compressor

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Similar components are denoted by the same reference numerals, and the same description will not be repeated.

(Sealed compressor 100)
FIG. 1 is a vertical cross-sectional view of a hermetic compressor 100 of this embodiment shown as an example of a compressor. The hermetic compressor 100 stores lubricating oil 20 in a hermetic container 15 and is mainly filled with a gas-phase refrigerant. The hermetic compressor 100 includes a frame 14 having a cylinder 16 as a compression element, a piston 13 fitted in a reciprocating manner in the cylinder 16, and a crankshaft 18 that is supported by a main bearing of the frame 14 and rotates. (Upper container 15a, lower container 15b).

  The crankshaft 18 includes a main shaft portion 18b that rotates within the main bearing, and an eccentric portion 18a that is integral with the main shaft portion 18b and revolves around the rotation axis of the main shaft portion 18b. The main bearing of the crankshaft 18 is fixed to the frame 14 or formed integrally with the frame 14. The revolving motion of the eccentric portion 18 a is converted into the reciprocating motion of the piston 13 via the connecting rod 28. The connecting rod 28 has one end connected to the piston 13 and the other end connected to the eccentric portion 18a.

  The hermetic compressor 100 has an electric element below the frame 14. The electric element is a mechanism for applying a rotational force to the crankshaft 18, and includes a stator 11 provided with a coil through which a current flows in response to a command from an inverter drive circuit (not shown), and a permanent magnet built in the main shaft portion 18b. And an attached rotor 25. The magnetic flux generated by the current flowing through the coils of the stator 11 rotates the rotor 25, and the main shaft portion 18b rotates accordingly.

  A rotor 25, a stator 11, and an anti-vibration spring 30 are sequentially provided in a direction (radial direction) orthogonal to the rotation axis of the main shaft portion 18b starting from the main shaft portion 18b. One end of the anti-vibration spring 30 is connected to the frame 14 on the radially outer side than the coil 110 of the stator 11. Further, the other end of the vibration isolating spring 30 is located above the liquid level of the lubricating oil 20. Here, the vibration-proof spring 30 may be connected at one end to the stator 11 instead of the frame.

  By installing the anti-vibration spring 30 in this way, for example, the height of the hermetic compressor 100 can be reduced as compared with the case where the anti-vibration spring 30 is installed below the stator 11.

(Viscous pump)
2 (a) and 2 (b) are enlarged views of the main part of FIG. 1, FIG. 3 (a) is a diagram showing a viscous pump of this embodiment, and FIG. 3 (b) is a diagram showing a viscous pump of a comparative example. is there. A configuration in which the lubricating oil 20 is pumped upward as the crankshaft 18 rotates is referred to as a viscous pump.
The main shaft portion 18b includes a substantially cylindrical hollow portion 18d at least on the lower end side and on the inner side. In the hollow portion 18d, there are provided a hollow cylindrical sleeve 19 connected to the lower end side of the main shaft portion 18b, and a substantially cylindrical fixed piece 21 substantially coaxial with the rotation shaft of the main shaft portion 18b. The sleeve 19 is located between the fixed piece 21 and the main shaft portion 18b in the radial direction.

  The lower end of the sleeve 19 is located below the lower end of the main shaft portion 18 b and is located below the oil level of the lubricating oil 20. On the other hand, the lower end of the main shaft portion 18 b is located above the oil surface of the lubricating oil 20. For this reason, it can suppress that the main-shaft part 18b stirs the lubricating oil 20. FIG.

  The lower end of the fixed piece 21 is located below the oil surface of the lubricating oil 20, and the upper end is located above the connecting portion between the main shaft portion 18 b and the sleeve 19. The fixed piece 21 can have a hollow structure.

  The rotation of the fixed piece 21 is suppressed by the linear support member 22. The support member 22 is preferably a member that can restrain the vertical movement in addition to the rotation direction of the fixed piece 21. Details of the support member 22 will be described later.

  On the outer peripheral surface of the fixed piece 21, a spiral groove 29 that is a spiral groove recessed in the radial direction so as to be separated from the sleeve 19 is provided. Further, on the outer peripheral surface of the fixed piece 21, a spiral convex portion 290 that protrudes in the radial direction so as to approach the sleeve 19 as compared with the spiral groove 29 is also provided. The convex portion 290 can substantially contact the inner surface of the sleeve 19.

  When the sleeve 19 connected to the main shaft portion 18b rotates with the main shaft portion 18b as the main shaft portion 18b rotates, the sleeve 19 rotates with respect to the spiral groove 29 and the convex portion 290. Each part of the spiral groove 29 is surrounded by convex portions 290 on both sides in the vertical direction. Since the lubricating oil 20 has a certain degree of viscosity, the lubricating oil 20 rises through the spiral groove 29. In this way, the sleeve 19, the fixed piece 21, the crankshaft 18 and the like are combined to function as a viscous pump. Thereby, the lubricating oil 20 can be pumped upward from the oil surface of the lubricating oil 20.

  The spiral groove 29 and the convex portion 290 may be provided in the sleeve 19. In this case, a through-hole 35 to be described later can be provided near the lower end of the fixed piece 21, for example, below the lower end of the sleeve 19.

  The upper and lower surfaces of the sleeve 19 are open, and the material is a metal material that is likely to have relatively high accuracy. The fixed piece 21 is made of a plastic material having low heat conductivity, such as refrigerant resistance and oil resistance, such as PPS, PBT, PEEK, and the like.

  A spiral groove 18c is provided on the surface of the main shaft portion 18b. That is, the space between the main shaft portion 18 b and the frame 14 functions as a second viscous pump, and the lubricating oil 20 that has risen following the spiral groove 29 is pumped up.

  The lubricating oil 20 that has lubricated the bearing portion through the spiral groove 18c is guided to the eccentric portion 18a. The lubricating oil 20 supplied to the eccentric part 18a passes through the supply hole 180, is supplied between the other end of the connecting rod 28 and the eccentric part 18a, and is provided in a supply hole (not shown) provided in the connecting rod 28. ) And lubrication between the piston 13 and the connecting rod 28 is performed. Further, since the upper end of the eccentric portion 18a is open, the lubricating oil 20 scatters from the upper end of the eccentric portion 18a due to centrifugal force as the crankshaft 18 rotates, and falls on the outer diameter portion of the piston 13 so that the piston 13 And the cylinder 16 are lubricated.

(Supporting member 22)
FIG. 4 is a front view of the support member 22 of this embodiment. The support member 22 is made of a thin metal, and is formed by bending a wire, for example. The support member 22 has an insertion portion 22b inserted into the through hole 35 at the center side, a bent piece 22a attached to the frame 14, the stator 29, or the sealed container 15 at both ends. The support member 22 has an upper portion 22d located above the insertion portion 22b and a lower portion 22c located below the upper portion 22d when the insertion portion 22b is inserted through the through hole 35. ing.
As described above, the support member 22 has a bent piece 22 a including both ends attached to the stator 11, the frame 14, or the sealed container 15, and an insertion portion 22 b including the center side as a mounted portion provided in the fixed piece 21. It is a member inserted through the hole 35.

  As illustrated in FIG. 3, lubricating oil 20 is stored at the bottom of the lower container 15b. Between the bottom of the lower container 15 b and the fixed piece 21, a certain gap dimension (exemplified as the dimension D in FIG. 3) is required to suppress these collisions.

  In the present embodiment illustrated in FIG. 2B and FIG. 3A, as the attached portion, the lower end portion of the outer peripheral surface of the fixed piece 21, for example, below the oil level of the lubricating oil 20 or the sleeve 19. A through hole 35 that is provided below the lower end and penetrates the fixed piece 21 is provided. The through hole 35 is a hole that passes through one or both of the convex portion 290 and the spiral groove 29 in the fixed piece 21. The through-hole 35 of this embodiment is provided so as to pass through each of the convex portion 290 and the spiral groove 29, but is preferably provided so as to pass through the convex portion 2902. If the through hole 35 is provided in the spiral groove 29, the lubricating oil 20 flowing through the spiral groove 29 flows through the through hole 35, which may reduce the effect of lifting the lubricating oil 20 by the viscous pump. . For this reason, when two holes are provided on the surface of the fixed piece 21 as in the case of the through-hole 35, it is most preferable that both of the holes are provided on the convex portion 290, and one portion is the convex portion 290 and one portion is provided. It is next preferable to be provided in the spiral groove 29. In addition, when the through-hole 35 is provided in the convex part 290, it is preferable that it fits in the convex part 290, ie, does not straddle the boundary with the spiral groove 29.

  Further, a part of the spiral groove 29 is provided below the lower end of the sleeve 19, and a part of the convex part 290 is provided below a part of the spiral groove 29. preferable. Thereby, the lubricating oil 20 can be effectively pumped from the region below the lower end of the sleeve 19.

  As in the present embodiment, the mounting portion such as the through-hole 35 having a configuration to which the support member 22 can be mounted is provided in the vicinity of the lower end of the outer peripheral portion of the fixed piece 21, so that the spiral groove 29 and the convex portion 290 are fixed to the fixed piece. 21 can be provided up to the lower end or near the lower end. That is, the lower end or the vicinity of the lower end of the fixed piece 21 can be used for attaching the support member 22 and can also be used for pumping the lubricating oil 20 as a viscous pump. Then, since there is a margin in the dimensions of the bottom of the lower container 15b and the lower end of the fixed piece 21, for example, the leg with which the lower side of the anti-vibration spring 30 is in contact can be lowered. Thereby, since an electric element and the whole compression element can move below, the upper surface height of the upper side container 15a can be made low. Therefore, the height of the compressor 100 can be reduced.

  On the other hand, the fixed piece 21 shown in FIG. 3B as a comparative example has a holding piece 26 having a through hole 26a through which the support member 22 is inserted at the lower end. Since the holding piece 26 does not have the spiral groove 29 or the convex portion 290 and is positioned below the lower end of the sleeve 19, it is difficult to function as a part of the viscous pump. For this reason, in order to suppress the collision between the bottom of the lower container 15b and the fixed piece 21, the spiral groove 29 and the convex part 290 of the fixed piece 21 are compared with the configuration illustrated as an example in FIG. Substantially shorter. For this reason, the pumping efficiency of the lubricating oil 20 tends to be low. For example, in the comparative example, when the pumping efficiency similar to that of the present embodiment is to be realized, the holding piece 26 protrudes from the fixed piece 21 as compared with the embodiment, and the D dimension cannot be sufficiently secured. That is, the holding piece 26 can easily come into contact with the bottom of the lower container 15b.

  In addition, the to-be-attached part of a present Example does not necessarily need to be a through-hole. If the rotation or the like of the fixed piece 21 can be suppressed by the support member 22 that connects the fixed piece 21 to the stator 11, the frame 14, the sealed container 15, or the like, the attached portion to which the fixed piece 21 is attached to the support member 22 is a non-through hole. , Through holes, other known locking portions, fitting portions, and the like.

(Position of the support member 22 with respect to the electric element)
It is preferable that the support member 22 has high rigidity so that the support member 22 can support the fixed piece 21 more firmly while avoiding contact between the electric element and the support member 22. Here, since the stator 29 is generally longer in the vertical direction than the rotor 25, the upper portion 22 d is positioned in a region corresponding to the rotor 25 in the radial direction, and corresponds to the stator 29. In such a region, it is possible to achieve both the suppression of contact and the improvement of rigidity by bending the support member 22 so that the lower side portion 22c is positioned.

  Further, in order to facilitate the insertion operation of the support member 22 into the through hole 35, the support member 22 can be easily inserted into the inlet and / or outlet of the through hole 35 as illustrated in FIG. A tapered enlarged portion 35a can be provided.

  The spiral groove 29 provided in the fixed piece 21 is immersed in the lubricating oil 20. The lubricating oil 20 in contact with the spiral groove 29 is held in the spiral groove 29 and is supplied to the upper compression element and the like by the operation of the compressor 100.

(refrigerator)
FIG. 5 is a longitudinal sectional view of a refrigerator that is an example of a device in which the hermetic compressor 100 is mounted. The refrigerator is controlled in the refrigerator compartment 2 controlled to the temperature in the refrigeration temperature zone, the freezer compartments 3, 4, 5 controlled to the temperature in the refrigeration temperature zone, and higher in temperature than the temperature in the refrigeration temperature zone, It has a vegetable room 6 to be controlled and a machine room 7 that houses the hermetic compressor 100. The machine room 7 may be provided on the lower rear side of the refrigerator or on the upper rear side.

  If the machine room 7 containing the hermetic compressor 100 according to the present embodiment is provided at the lower rear side of the refrigerator, the volume of the vegetable room 6 is easily improved, and if provided at the upper rear side, the volume of the refrigerator compartment is easily improved.

2 Refrigeration chambers 3, 4, 5 Freezer chamber 6 Vegetable chamber 7 Machine chamber 11 Stator 13 Piston 14 Frame 15 Sealed container 16 Cylinder 18 Crankshaft 18 a Eccentric portion 18 b Main shaft portion 18 c Spiral groove 18 d Hollow portion 19 Sleeve 20 Lubricating oil 21 Fixed Piece 22 Support member 22a Bending piece 22b Insertion part 22c Lower side part 22d Upper part 25 Rotor 26 Stator 27 Viscous pump 28 Connecting rod 29 Spiral groove 290 Convex part 30 Anti-vibration spring 35 Through hole 35a Enlarged part (taper)
100 hermetic compressor

Claims (5)

A rotatable main shaft,
A fixed piece having a spiral groove and a spiral protrusion;
The fixed piece is a hermetic compressor having an attached portion to which a support portion is attached in an area where the spiral groove or the convex portion is provided.   The hermetic compressor according to claim 1, wherein the fixed piece has the attached portion in a region where the convex portion is provided. The attached portion is a hole,
The hermetic compressor according to claim 1, wherein the hole has a tapered shape that widens toward the outside of the fixed piece. A rotor positioned radially outward with respect to the main shaft portion and the fixed piece;
A stator positioned radially outward with respect to the rotor,
The support member is
Linear,
An insertion portion attached to the fixed piece at the attached portion;
Located in the area where the rotor is provided in the radial direction, an upper part located above the insertion part,
The hermetic mold according to any one of claims 1 to 3, further comprising: a lower side portion that is located in a region where the stator is provided in a radial direction and is located below the upper side portion. Compressor.   The apparatus provided with the hermetic compressor as described in any one of Claims 1 thru | or 4.

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