JP2013070521A - Fluid machinery and method of manufacturing the same - Google Patents

Abstract

A fluid machine capable of assembling a rotor without heating is provided.
On the upper end side of the main shaft 2, the outer diameter is made larger than the diameter of the first through hole 1g-1, and the position in the axial direction is determined by engaging with the periphery of the first through hole 1g-1. The step 2a is formed, the step 2a is locked to the periphery of the first through hole 1g-1, and the fixing member 3 is attached to the main shaft 2 in a state where the positioning recess 3a and the tip of the positioning pin 1i are aligned. Stick.
[Selection] Figure 2

Description

  The present invention relates to an electric compressor that compresses a gas such as refrigerant gas or air, a fluid machine that is used as a pump that moves a liquid such as water or oil, and a method of manufacturing the fluid machine.

  2. Description of the Related Art Conventionally, an electric compressor (hereinafter simply referred to as a compressor), which is one of fluid machines, has been used as a component of a heat pump device such as an air conditioner, a water heater, or a refrigeration apparatus. A general compressor includes a compression mechanism and an electric motor. The electric motor includes a rotor and a stator, and a main shaft for transmitting a rotational force to the compression mechanism is fixed to the rotor. In many cases, the rotor is fixed by shrink fitting or press-fitting into the main shaft (for example, see Patent Document 1).

  In some cases, the rotor is press-fitted and fixed to the main shaft (for example, see Patent Document 2). In addition, so-called key grooves (spline grooves, cut grooves) are provided on the main shaft, and so-called key members (spline teeth, protrusions) are provided on the rotor to restrict rotation and axial movement, and the main shaft and rotor are fastened. There are some (see, for example, Patent Documents 2 and 3).

  Moreover, there exists a rotor formed by laminating a plurality of steel plates. Such a rotor has permanent magnets arranged inside laminated steel plates, end plates made of non-magnetic material on both sides (both ends) of the laminated steel plates, and rivets that penetrate the end plates and the laminated steel plates. Often signed. Further, there is a type in which a balance weight is arranged at one or both ends of the rotor, and the end plate, the laminated steel plate, and the balance weight are fastened with rivets.

JP 2010-226932 A (for example, FIG. 2 etc.) Japanese Patent Application Laid-Open No. 59-106838 (for example, FIGS. 2 to 5) Japanese Patent Laid-Open No. 62-16034 (for example, FIG. 5)

  In the case where the main shaft and the rotor are shrink-fitted and fixed, the permanent magnet in the rotor is also heated by the heat generated by the shrink-fitting, which may deteriorate the characteristics of the permanent magnet. In the case of fixing the main shaft and the rotor by press fitting regardless of shrink fitting, it is necessary to consider the strength of the rotor and the main shaft, which leads to an increase in manufacturing cost. In addition, the keyway method requires processing of the keyway and a key member, which further increases the manufacturing cost. Further, in the case where the end plate, the laminated steel plate and the balance weight are fastened with rivets, the work of caulking the rivets is required, which increases the number of work steps.

  The present invention has been made to solve at least one of the above-described problems, and an object thereof is to provide a fluid machine that can be assembled without heating the rotor and a method of manufacturing the fluid machine. Yes.

  The fluid machine according to the present invention includes a sealed container, a compression mechanism unit that is disposed in the sealed container and compresses the fluid, an electric motor that is disposed in the sealed container and drives the compression mechanism unit, and the compression mechanism. And a main shaft that connects the motor and the motor, and the motor has a stator in which a multi-phase winding is mounted on an iron core, and the main shaft is fixed to the inner peripheral surface of the stator. A first through hole through which the main shaft is inserted. The rotor has a diameter substantially equal to or greater than the outer diameter of the main shaft. A laminated steel plate in which a plurality of steel plates each having a magnet insertion hole in which a permanent magnet is mounted and a first positioning hole into which a positioning pin for determining a circumferential position of the rotor is press-fitted are laminated; and The second through hole through which the main shaft is inserted and the tip of the positioning pin are mounted. The positioning recess is formed, and is pressed into the fixing member provided on one surface side of the laminated steel sheet and the first positioning hole formed in the laminated steel sheet, and the tip is attached to the fixing member. And determining a circumferential position of the rotor, and a positioning pin for fixing the laminated steel plate, and an outer diameter is larger than a diameter of the first through hole on the upper end side of the main shaft. A step portion for determining the position in the axial direction is formed by engaging with the peripheral edge of the one through hole, the main shaft is inserted through the first through hole and the second through hole, and the step portion is the first portion. The fixing member is fixed to the main shaft in a state where the positioning concave portion and the positioning pin are aligned with each other.

  In the fluid machine manufacturing method according to the present invention, the first through hole into which the main shaft is inserted, the magnet insertion hole into which the permanent magnet is mounted, and the positioning pin for determining the circumferential position of the rotor are press-fitted. A permanent magnet is mounted in a laminated steel plate obtained by laminating a plurality of steel plates each having a positioning hole, and a third through hole into which the main shaft is inserted and a positioning pin are press-fitted into upper and lower ends of the laminated steel plate. An end plate formed with a second positioning hole is disposed, and a balance weight formed with a third positioning hole into which the positioning pin is press-fitted is disposed on one side of the end plate, and the first positioning hole A positioning pin is press-fitted into the second positioning hole and the third positioning hole, the main shaft is press-fitted or fitted into the first through hole and the third through hole, and the main shaft is inserted. Second through hole and positioning A fixing member positioning recess down the tip is attached is formed is inserted into the main shaft, the fixing member in a state in which the leading end of the positioning pin and the positioning recess is met is to fixed to the main shaft.

  According to the fluid machine of the present invention, assembly work can be performed without heating the rotor, and deterioration of the magnet characteristics due to heating can be significantly suppressed.

  According to the method for manufacturing a fluid machine according to the present invention, energy for heating the rotor is unnecessary, and the time for heating and cooling the rotor can be shortened. Therefore, it is possible to reduce manufacturing man-hours, assembly work time, and manufacturing costs.

It is a schematic longitudinal cross-sectional view which shows an example of schematic structure of the electric compressor which concerns on Embodiment 1 of this invention. It is the schematic which shows schematically the rotor of the electric compressor which concerns on Embodiment 1 of this invention. It is a top view of a laminated steel plate. It is a top view of an end plate. FIG. 10 is a reference diagram schematically showing a rotor having a conventional structure. It is explanatory drawing for demonstrating the assembly with the main axis | shaft and rotor of the electric compressor which concerns on Embodiment 1 of this invention. It is the schematic which shows schematically the rotor of the electric compressor which concerns on Embodiment 2 of this invention. It is the schematic which shows schematically the rotor of the electric compressor which concerns on Embodiment 3 of this invention. It is reference explanatory drawing in the case of assembling with the open side facing upward so that the permanent magnets arranged in the laminated steel plates do not fall out.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1.
FIG. 1 is a schematic longitudinal sectional view showing an example of a schematic configuration of an electric compressor (hereinafter referred to as a compressor 100) according to Embodiment 1 of the present invention. Based on FIG. 1, the structure and operation | movement of the compressor 100 which is one of the fluid machines are demonstrated. The compressor 100 is a component of a refrigeration cycle apparatus such as a refrigerator, a freezer, a vending machine, an air conditioner, a refrigeration apparatus, or a water heater. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The compressor 100 sucks a fluid such as a refrigerant, compresses it, and discharges it as a high-temperature and high-pressure state. The compressor 100 includes a compression mechanism part A and a drive mechanism part B. The compression mechanism part A and the drive mechanism part B are accommodated in a shell (sealed container) 1. The shell 10 is a pressure vessel. As shown in FIG. 1, the compression mechanism portion A is disposed on the upper side of the shell 10, and the drive mechanism portion B is disposed on the lower side of the shell 10. The bottom of the shell 10 is a sump 11 for storing refrigeration oil. In addition, a suction pipe 12 for sucking fluid and a discharge pipe 13 for discharging fluid are connected to the shell 10.

  The compression mechanism A has a function of compressing the fluid sucked from the suction pipe 12 and discharging it to the discharge space 15 in the shell 10. The fluid discharged into the discharge space 15 is discharged from the discharge pipe 13 to the outside of the compressor 100. The drive mechanism B serves to drive the orbiting scroll 24 constituting the compression mechanism A so that the compression mechanism A can compress the fluid. That is, the fluid is compressed by the compression mechanism A when the drive mechanism B drives the orbiting scroll 24 via the main shaft 2.

  The compression mechanism part A is roughly composed of a swing scroll 24 and a fixed scroll 28. As shown in FIG. 1, the orbiting scroll 24 is arranged on the lower side, and the fixed scroll 28 is arranged on the upper side. The fixed scroll 28 is formed with a lap portion 29 which is a spiral projection standing on one surface. Further, the oscillating scroll 24 is also formed with a wrap portion 25 which is a spiral protrusion standing on one surface. The swing scroll 24 and the fixed scroll 28 are mounted in the shell 10 with the lap portion 25 and the lap portion 29 meshing with each other. And between the lap | wrap part 25 and the lap | wrap part 29, the compression chamber 18 from which a volume changes relatively is formed.

  The fixed scroll 28 is fixed to the frame 31 with a bolt or the like (not shown). A discharge port 30 that discharges a compressed and high-pressure fluid is formed at the center of the fixed scroll 28. Then, the compressed and high pressure fluid is discharged into the discharge space 15 provided in the upper part of the fixed scroll 28. The orbiting scroll 24 performs a revolving orbiting motion without rotating with respect to the fixed scroll 28. Further, a hollow cylindrical orbiting scroll boss portion 26 is formed at a substantially central portion of a surface (hereinafter referred to as a thrust surface 27) opposite to the surface on which the wrap portion 25 is formed of the orbiting scroll 24. An eccentric pin portion 2c provided at the upper end of the main shaft 2, which will be described later, is fitted (engaged) to the orbiting scroll boss portion 26.

  The drive mechanism B includes a rotor 1 fixed to the main shaft 2, a stator 20 housed in the shell 10 and fixedly held, and a main shaft 2 serving as a rotation shaft. The rotor 1 is fixed to the main shaft 2, and is driven to rotate when the energization of the stator 20 is started to rotate the main shaft 2. Further, the outer peripheral surface of the stator 20 is fixedly supported on the shell 10 by shrink fitting or the like. The rotor 1 is rotatably disposed on the inner peripheral surface side of the stator 20. That is, the rotor 1 and the stator 20 constitute a motor (permanent magnet type electric motor). The configuration of the rotor 1 will be described in detail below.

  The stator 20 is configured by mounting a plurality of phases of stator windings (not shown) on a stator core (not shown). The main shaft 2 rotates with the rotation of the rotor 1 to turn the orbiting scroll 24. An upper end portion of the main shaft 2 is formed with an eccentric pin portion 2 c that is rotatably fitted to the orbiting scroll boss portion 26 of the swing scroll 24. The refrigerating machine oil accumulated in the sump 11 is sucked up along with the rotation of the main shaft 2, flows through an oil supply passage (not shown) formed in the main shaft 2, and is supplied to the compression mechanism portion A. Yes.

  The upper part of the main shaft 2 is rotatably supported by a main bearing 34 provided in the through hole of the frame 31, and the lower part of the main shaft is a sub bearing (not shown) provided in the through hole of the sub frame 32. It is supported so that it can rotate freely.

  The frame 31 is fixed to the inner peripheral surface of the shell 10, and a through hole through which the main shaft 2 is inserted is formed at the center. A main bearing 34 that rotatably supports the main shaft 2 is provided in the through hole. Further, an oil drain hole penetrating from the thrust surface 27 side of the orbiting scroll 24 to the lower side in the axial direction may be formed in the frame 31 so that the refrigerating machine oil that has lubricated the thrust surface 27 is returned to the sump 11. . The frame 31 may be fixed to the inner peripheral surface of the shell 10 by shrink fitting, welding, or the like.

  The subframe 32 has an outer peripheral surface fixed to the inner peripheral surface of the shell 10 by shrink fitting, welding, or the like, and a through-hole through which the main shaft 2 is inserted is formed at the center. The through-hole is provided with a sub-bearing for rotatably supporting the main shaft 2. The subframe 32 is installed below the shell 10 and supports the lower part of the main shaft 2.

  An Oldham ring 33 is provided between the rocking scroll 24 and the fixed scroll 28 or between the rocking scroll 24 and the frame 31 to prevent the rotation of the rocking scroll 24 during the eccentric turning motion. ing. The Oldham ring 33 is disposed between the orbiting scroll 24 and the fixed scroll 28 and serves to prevent the orbiting scroll 24 from rotating and to enable a revolving orbiting motion. That is, the Oldham ring 33 functions as a rotation prevention mechanism for the orbiting scroll 24. 1 shows an example in which the Oldham ring 33 is disposed between the swing scroll 24 and the fixed scroll 28, but the Oldham ring 33 is disposed between the swing scroll 24 and the frame 31 as described above. May be provided.

Here, the operation of the compressor 100 will be briefly described.
The rotor 1 constituting the motor rotates by receiving a rotational force from a rotating magnetic field generated by the stator 20. Along with this, the main shaft 2 fixed to the rotor 1 is rotationally driven. The orbiting scroll 24 is engaged with the eccentric pin portion 2 c of the main shaft 2, and the rotating rotation motion of the orbiting scroll 24 is converted into the revolution turning motion by the rotation preventing mechanism of the Oldham ring 33. As the main shaft 2 rotates, the fluid in the shell 10 flows into the compression chamber 18 formed by the lap portion 29 of the fixed scroll 28 and the wrap portion 25 of the swing scroll 24, and the suction process starts.

  When the fluid is sucked into the compression chamber 18, the revolving orbiting motion of the eccentric orbiting scroll 24 shifts to a compression process for reducing the volume of the compression chamber 18. That is, in the compression mechanism part A, when the orbiting scroll 24 revolves, the fluid is taken in from the outermost peripheral openings of the wrap part 25 of the orbiting scroll 24 and the lap part 29 of the fixed scroll 28 that serve as suction ports. As the rocking scroll 24 rotates, it gradually goes to the center while being compressed. Note that the fluid flows into the shell 10 from the suction pipe 12. And the fluid compressed by the compression chamber 18 transfers to a discharge process. That is, the fluid passes through the discharge port 30 of the fixed scroll 28 and is discharged to the outside of the compressor 100 after passing through the discharge space 15.

  FIG. 2 is a schematic diagram schematically showing the rotor 1 of the electric compressor 100 according to Embodiment 1 of the present invention. FIG. 3 is a plan view of the laminated steel sheet 1a. FIG. 4 is a plan view of the end plate 1c and the end plate 1d. The rotor 1 will be described with reference to FIGS. FIG. 5 is a reference diagram schematically showing a rotor 1 ′ having a conventional structure. In FIG. 5, the same parts as those of the rotor 1 shown in FIG. 5 shows the permanent magnet 1b housed in the rotor, but the permanent magnet is not shown in FIG.

  In the rotor 1 shown in FIG. 2, the main shaft 2 is fixed to the first through hole 1 g-1 formed in the rotor 1 by press-fitting or gap fitting. The rotor 1 is fixed to the main shaft 2, constitutes a part of a motor together with the stator 20 and the main shaft 2, and is arranged rotatably on the inner peripheral surface side of the stator 20.

  In FIG. 2, the rotor 1 is formed by laminating a plurality of steel plates (hereinafter referred to as laminated steel plates 1a). And the end plate 1c and the end plate 1d which have an outer diameter substantially equal to the outer diameter of the laminated steel plate 1a are installed in the upper end and lower end of the rotor 1, respectively. That is, the end plate 1c and the end plate 1d are installed so as to sandwich the laminated steel plate 1a from above and below. Further, a balance weight 1f for maintaining balance during rotation is attached to the lower side of the end plate 1d on the lower end side. Further, a fixing member 3 is fixed to the main shaft 2 below the balance weight 1f. The fixing member 3 supports the rotor 1 below by fixing the main shaft 2 to a second through hole 1g-2 formed in a substantially central portion.

  The laminated steel plate 1a, the end plate 1c, the end plate 1d, and the balance weight 1f are formed with positioning holes penetrating in the axial direction. The positioning holes formed in the laminated steel plate 1a are formed in the first positioning hole 1h-1, the positioning holes formed in the end plate 1c and the end plate 2d are formed in the second positioning hole 1h-2, and the balance weight 1f. These positioning holes are referred to as third positioning holes 1h-3, respectively, and in the following description, they may be collectively referred to as positioning holes 1h.

  A positioning pin 1i is inserted into the positioning hole 1h. The positioning pin 1i determines the circumferential position of the rotor 1 and fixes the laminated steel plate 1a. And the diameter of the positioning pin 1i is larger than the diameter of the positioning hole 1h formed in each of the laminated steel plate 1a, the end plate 1c, the end plate 1d, and the balance weight 1f. Further, the fixing member 3 is formed with a positioning recess 3a in which the tip (lower side of the drawing) of the positioning pin 1i is mounted. As described above, the fixing member 3 is formed with the second through hole 1g-2 through which the main shaft 2 is inserted.

  As shown in FIG. 3, in addition to the first positioning hole 1h-1, the laminated steel sheet 1a has a first through hole 1g-1 through which the main shaft 2 is inserted (hereinafter referred to as an inner diameter of the first through hole 1g-1). 1g-1) may be formed through the substantially central portion. Further, in addition to the first positioning hole 1h-1 and the first through hole 1g-1, the laminated steel sheet 1a is formed with a magnet insertion hole 1j that is a space in which the permanent magnet 1b is mounted. Although FIG. 3 shows an example in which six magnet insertion holes 1j are formed, the number of magnet insertion holes 1j is not particularly limited.

  As shown in FIG. 4, the end plate 1c and the end plate 1d are formed with a third through hole 1g-3 through which the main shaft 2 is inserted, in addition to the second positioning hole 1h-2. In addition, the magnet insertion hole is not formed in the end plate 1c and the end plate 1d. That is, it functions as a stopper for the permanent magnet 1b to which the end plate 1c and the end plate 1d are attached. At this time, the end plate 1c and the end plate 1d may be made of a non-magnetic material to have a function of suppressing leakage magnetic flux in the rotor axial direction.

  In addition to the third positioning hole 1h-3, the balance weight 1f may have a through hole through which the main shaft 2 is inserted. Note that no magnet insertion hole is formed in the balance weight 1f. In addition, the presence or absence of the through hole of the balance weight 1f depends on the shape of the balance weight 1f.

  A rotor positioning step (hereinafter referred to as a step 2a) for axial positioning is formed at the upper end of the attachment portion of the rotor 1 of the main shaft 2. The step portion 2a is a portion whose outer diameter is larger than the inner diameter 1g-1 so that the upper end side of the main shaft 2 does not enter the first through hole 1g-1. The axial position of the rotor 1 is determined by the stepped portion 2a being engaged with the peripheral edge on the upper end side of the end plate 1c. Further, the outer diameter at the position corresponding to the first through hole 1g-1 of the rotor 1 of the main shaft 2 is denoted by reference numeral “2b”. In the rotor 1 shown in FIG. 2, the inner diameter 1g-1 of the rotor 1 is set substantially equal to or larger than the outer diameter 2b of the main shaft 2 (inner diameter 1g-1> outer diameter 2b), and the main shaft 2 is press-fitted. Alternatively, it is fixed by gap fitting.

  On the other hand, the conventional rotor 1 'shown in FIG. 5 has a main shaft 2' fixed to the rotor 1 'by shrink fitting. The rotor 1 ′ shown in FIG. 5 is also fixed to the main shaft 2 ′, constitutes a part of the motor together with the stator 20 ′ and the main shaft 2 ′, and is rotatably arranged on the inner peripheral surface side of the stator. It has become. However, the rotor 1 ′ is not provided with the fixing member 3, and the rivet insertion hole 1h ′ (positioning hole 1h) formed through the laminated steel plate 1a ′, the end plate 1c ′, the end plate 1d ′, and the balance weight 1f ′. Is equivalent to the rivet 1e.

  When the main shaft 2 ′ and the rotor 1 ′ are fixed by shrinkage fitting, the permanent magnet mounted in the rotor 1 ′ is also heated by the heat of the shrinkage fitting of the rotor 1 ′, and the magnet characteristics deteriorate. there is a possibility. Therefore, the rotor 1 significantly suppresses deterioration of the magnet characteristics by press-fitting or fixing the main shaft 2 by press-fitting or clearance fitting as compared with the case where the main shaft 2 ′ is shrink-fitted and fixed. The rotor 1 sandwiches the laminated steel plate 1a from above and below by the step 2a of the main shaft 2 and the fixing member 3 so as to enhance the fixing force between the main shaft 2 and the rotor 1. Below, the assembly of the main shaft 2 and the rotor 1 when using press-fitting or clearance fitting will be described.

  FIG. 6 is an explanatory diagram for explaining assembly of the main shaft 2 and the rotor 1 of the compressor 100 according to Embodiment 1 of the present invention. Based on FIG. 6, assembly of the main shaft 2 and the rotor 1 will be described in detail.

FIG. 6 (a)
A permanent magnet 1b is mounted in a laminated steel sheet 1a in which a plurality of steel sheets are laminated. Then, the end plate 1c is disposed at the upper end of the laminated steel plate 1a, and the end plate 1d is disposed at the lower end. Thereafter, the balance weight 1f is disposed below the end plate 1d, and the positioning pins 1i are press-fitted into the positioning holes 1h formed in these.

FIG. 6 (b)
In this way, the rotor 1 is assembled.

FIG. 6 (c)
The inner diameter 1g-1 of the rotor 1 is set to be substantially the same as the outer diameter 2b of the main shaft 2 or 1g-1> 2b. Therefore, the rotor 1 can be press-fitted or fitted into the main shaft 2 without being shrink-fitted.
At this time, the fastening allowance ((2b)-(1g-1)) is generally designed to be 2/10000 to 100/10000 with respect to the main shaft diameter in order to satisfy the necessary holding force in the assembly method by shrink fitting. However, it is better to design with a tightening margin <0 for clearance fitting and a small tightening margin of 2/10000 to 30/10000 for the main shaft diameter for press-fitting. Thereby, it is possible to avoid and suppress damage to the spindle 2 and the rotor 1 due to the press-fitting load during press-fitting and an increase in manufacturing cost.
The fixing member 3 is fixed to the main shaft 2 so that the main shaft 2 is inserted into the second through hole 1g-2 and the positioning recess 3a and the tip of the positioning pin 1i are aligned. The fixing of the fixing member 3 is not particularly limited. For example, the main shaft 2 may be fixed to the second through hole 1g-2 of the fixing member 3 by shrink fitting or the like.

  In addition, when sequentially assembling each member into the main shaft 2, the assembly may be performed while passing a guide (not shown) through the positioning hole 1h in advance. In this way, positioning of each member can be performed reliably. Finally, the positioning pin 1i is pressed once into the fixing member 3, the laminated steel plate 1a, the end plate 1c, the end plate 1d, and the balance weight 1f, and the rotor 1 is assembled. Furthermore, the punching press for the end plate 1c, the end plate 1d and the laminated steel plate 1a can be integrated with the main shaft 2-rotor 1 assembling apparatus. If such an assembling apparatus is used, the punched end plate 1c, end plate 1d, and laminated steel plate 1a are sequentially laminated on the main shaft 2, and when the punching is completed to a predetermined thickness, the permanent magnet 1b is inserted, There is also a method in which the end plate 1d and the balance weight 1f are covered, and the fixing member 3 is inserted and fixed to the main shaft 2 from above, so that the manufacturing process can be made more efficient.

  As described above, according to the electric compressor 100, the rotor 1 is sandwiched between the stepped portion 2a formed on the main shaft 2 and the fixing member 3 fixed to the lower end of the rotor 1, so that axial positioning is achieved. Fixing is possible. Therefore, according to the electric compressor 100, it is possible to easily position the main shaft 2 in the axial direction and fix the main shaft 2 and the rotor 1 without using a complicated structure, and to suppress deterioration of the magnet characteristics of the permanent magnet. realizable. Further, since one end of the positioning pin 1i is engaged with the positioning recess 3a of the fixing member 3, the circumferential positioning and fixing can be performed reliably. Furthermore, since the caulking process using rivets can be omitted, the number of manufacturing steps can be reduced.

  Therefore, according to the electric compressor 100, the rotor 1 can be assembled without heating, and the deterioration of the magnet characteristic by heating can be suppressed significantly. Further, energy for heating the rotor 1 is not necessary, and the time for heating and cooling the rotor 1 can be shortened, leading to reduction in man-hours, time and cost required for manufacturing.

  2 shows an example in which the positioning recess 3a does not penetrate the fixing member 3, the positioning recess 3a may be used as a positioning hole to penetrate the fixing member 3. However, also in this case, it assembles in the position where the tip of positioning pin 1i reached the positioning hole. The positioning pin 1i has a diameter larger than the diameter of the positioning hole 1h, and may be any rod-like member that can be press-fitted into the positioning hole 1h, and the material and shape thereof are not particularly limited. Furthermore, although it has been described that the main shaft 2 is press-fitted or fitted into the rotor 1, it is assumed that the rotor 1 is press-fitted or fitted into the main shaft 2.

Embodiment 2. FIG.
FIG. 7 is a schematic diagram schematically showing a rotor 1A of the electric compressor according to the second embodiment of the present invention. The rotor 1A will be described with reference to FIG. In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. Further, although the permanent magnet is housed in the rotor 1A, the permanent magnet is not shown in FIG.

  In the rotor 1A shown in FIG. 7, the main shaft 2 is fixed to the rotor 1A by press fitting or gap fitting. The rotor 1A is fixed to the main shaft 2, constitutes a part of the motor together with the stator 20 and the main shaft 2, and is arranged rotatably on the inner peripheral surface side of the stator 20. That is, the rotor 1A is used by being incorporated in a fluid machine such as the electric compressor 100 described in the first embodiment. In the first embodiment, an example in which the balance weight 1f and the fixing member 3 are separated is shown. However, in the second embodiment, the balance weight 1f and the fixing member 3 are integrated (hereinafter referred to as a fixing member 3A). An example is shown. The rest is the same as in the first embodiment.

  The fixing member 3A includes a substantially annular part (part 3A-1 shown in FIG. 7) in a plan view and a substantially fan-shaped part (a part ring shape shown in FIG. 7) in a plan view. ) And. The portion 3A-1 is a portion that functions to fix the rotor 1A. The portion 3A-2 is a portion that functions as a balance weight. In the portion 3A-1 of the fixing member 3A, there is formed a positioning recess 3aA in which the tip (lower side of the drawing) of the positioning pin 1i is mounted.

The assembly of the main shaft 2 and the rotor 1A will be described below.
A permanent magnet 1b (see FIGS. 3 and 6) is mounted in a laminated steel sheet 1a in which a plurality of steel sheets are laminated. Then, the end plate 1c is disposed at the upper end of the laminated steel plate 1a, and the end plate 1d is disposed at the lower end. Thereafter, the positioning pins 1i are press-fitted into the positioning holes 1h formed in these. In this way, the rotor 1A is assembled. The inner diameter 1g-1 of the rotor 1A is set to be substantially the same as the outer diameter 2b of the main shaft 2 or 1g-1> 2b. Therefore, the rotor 1 </ b> A has a configuration that can be press-fitted or fitted into the main shaft 2 without being shrink-fitted. The fixing member 3A is fixed to the main shaft 2 so that the positioning recess 3aA and the tip of the positioning pin 1i are aligned. The fixing of the fixing member 3A is not particularly limited. For example, the fixing member 3 may be fixed to the main shaft by shrink fitting.

  In addition, when sequentially assembling each member into the main shaft 2, the assembly may be performed while passing a guide (not shown) through the positioning hole 1h in advance. In this way, positioning of each member can be performed reliably. Finally, the positioning pin 1i is pressed once into the fixing member 3A, the laminated steel plate 1a, the end plate 1c, and the end plate 1d, and the rotor 1A is assembled. Moreover, the punching press machine for the end plate 1c, the end plate 1d and the laminated steel plate 1a can be integrated with the assembly device for the main shaft 2-rotor 1A. If such an assembling apparatus is used, the punched end plate 1c, end plate 1d, and laminated steel plate 1a are sequentially stacked on the main shaft 2, and when the punching is completed to a predetermined thickness, the permanent magnet 1b is inserted, There is also a method in which the end plate 1d is covered and the fixing member 3A is inserted and fixed to the main shaft 2 from above, so that the manufacturing process can be made more efficient.

  As described above, according to the electric compressor according to the second embodiment, the rotor 1A is sandwiched between the step portion 2a formed on the main shaft 2 and the fixing member 3A fixed to the lower end of the rotor 1A. Axial positioning and fixation are possible. Therefore, according to the electric compressor according to the second embodiment, the axial positioning of the main shaft 2 and the fixing of the main shaft 2 and the rotor 1A can be easily performed without using a complicated structure, and the magnet of the permanent magnet It is possible to suppress the deterioration of characteristics. Further, since one end of the positioning pin 1i is engaged with the positioning recess 3aA of the fixing member 3A, the positioning and fixing in the circumferential direction can be performed reliably. Furthermore, since the caulking process using rivets can be omitted, the number of manufacturing steps can be reduced. In addition, since the fixing member 3A has a function as a fixing member and a function as a balance weight, the number of parts can be reduced accordingly.

  Therefore, according to the electric compressor according to the second embodiment, the rotor 1A can be assembled without heating, and deterioration of magnet characteristics due to heating can be significantly suppressed. Further, energy for heating the rotor 1A is not necessary, and the time for heating and cooling the rotor 1A can be shortened, leading to reduction in man-hours, time and cost required for manufacturing. Also, by integrating some of the components, the number of components can be reduced.

  7 shows an example in which the positioning recess 3aA does not pass through the fixing member 3A, but the positioning recess 3aA may pass through the fixing member 3A using the positioning recess 3aA as a positioning hole. However, also in this case, it assembles in the position where the tip of positioning pin 1i reached the positioning hole. The positioning pin 1i has a diameter larger than the diameter of the positioning hole 1h, and may be any rod-like member that can be press-fitted into the positioning hole 1h, and the material and shape thereof are not particularly limited. Furthermore, although it has been described that the main shaft 2 is press-fitted or fitted into the rotor 1 </ b> A, it is assumed that the rotor 1 </ b> A is press-fitted or fitted into the main shaft 2.

Embodiment 3 FIG.
FIG. 8 is a schematic diagram schematically showing a rotor 1B of the electric compressor according to the third embodiment of the present invention. The rotor 1B will be described based on FIG. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted. It shall be. Further, although the permanent magnet is housed in the rotor 1B, the permanent magnet is not shown in FIG.

  In the rotor 1B shown in FIG. 8, the main shaft 2 is fixed to the rotor 1B by press fitting or gap fitting. The rotor 1B is fixed to the main shaft 2, constitutes a part of the motor together with the stator 20 and the main shaft 2, and is arranged rotatably on the inner peripheral surface side of the stator 20. That is, the rotor 1B is used by being incorporated in a fluid machine such as the electric compressor 100 described in the first embodiment. In the second embodiment, the balance weight 1f and the fixing member 3 are integrated, and the main shaft 2 and the rotor 1A are fixed by the fixing member 3A. However, in the third embodiment, the balance weight 1f and the fixing member 3 are fixed. In the example, the member 3 is integrated with a nonmagnetic material (hereinafter referred to as a fixing member 3B), and the end plate 1d is omitted. The rest is the same as in the second embodiment.

  The fixing member 3B includes a substantially annular portion (portion 3B-1 shown in FIG. 8) in a plan view, and a substantially fan-shaped (fan ring shape) portion (a portion 3B-2 shown in FIG. 8) in a plan view. ) And. The part 3B-1 is a part that functions to fix the rotor 1B. The portion 3B-2 is a portion that functions as a balance weight. In the portion 3B-1 of the fixing member 3B, a positioning recess 3aB in which the tip (lower side of the drawing) of the positioning pin 1i is mounted is formed.

The assembly of the main shaft 2 and the rotor 1B will be described below.
A permanent magnet 1b (see FIGS. 3 and 6) is mounted in a laminated steel sheet 1a in which a plurality of steel sheets are laminated. And the end plate 1c is arrange | positioned at the upper end of the laminated steel plate 1a. Thereafter, the positioning pins 1i are press-fitted into the positioning holes 1h formed in these. In this way, the rotor 1B is assembled. The inner diameter 1g-1 of the rotor 1B is set to be substantially the same as the outer diameter 2b of the main shaft 2 or 1g-1> 2b. Therefore, the rotor 1 </ b> B has a configuration that can be press-fitted or fitted into the main shaft 2 without shrink fitting. The fixing member 3B is fixed to the main shaft 2 so that the positioning recess 3aB and the tip of the positioning pin 1i are aligned. The fixing of the fixing member 3B is not particularly limited. For example, the fixing member 3B may be fixed to the main shaft by shrink fitting.

  Note that the rotor 1B is not provided with the end plate 1d, and when the rotor 1B is press-fitted or fitted into the main shaft 2, the lower portion of the magnet insertion hole 1j is opened. Therefore, it is necessary to always assemble the open side upward so that the permanent magnet 1b disposed in the laminated steel plate 1a does not fall off, or to take a support or temporary cover for preventing the falling off (see FIG. 9).

  FIG. 9 is a reference explanatory diagram when the open side is assembled upward so that the permanent magnet 1b (see FIGS. 3 and 6) disposed in the laminated steel plate 1a does not fall out. As described above, the end plate 1d is not provided on the rotor 1B. Therefore, when the rotor 1B is press-fitted or fitted into the main shaft 2, the lower part of the magnet insertion hole 1j is opened, and the permanent magnet 1b may fall off. Therefore, as shown in FIG. 9, the open side faces upward so that the permanent magnet 1b disposed in the laminated steel plate 1a does not fall off.

  First, the main shaft 2 is set with the lower end of the main shaft 2 facing upward (FIG. 9 (1)). Then, the main shaft 2 is press-fitted or fitted into the first through hole 1g-1 (FIG. 9 (2)). With the main shaft 2 inserted through the first through hole 1g-1, the fixing member 3B is disposed so that the positioning recess 3aB of the fixing member 3B and the tip of the positioning pin 1i are aligned with each other, and fixed to the main shaft 2. (FIG. 9 (3)). In this way, the main shaft 2 and the rotor 1B can be assembled without the permanent magnet 1b falling off and without undergoing complicated work processes.

  When the assembly is performed with the open side facing upward so that the permanent magnet 1b disposed in the laminated steel plate 1a does not fall out, and when each member is sequentially inserted into the main shaft 2 and assembled, a guide ( It is better to assemble while passing through (not shown). In this way, positioning of each member can be performed reliably. Finally, the positioning pin 1i is pressed once into the fixing member 3B, the laminated steel plate 1a, and the end plate 1c, and the rotor 1B is assembled. Moreover, the punching press machine for the end plate 1c and the laminated steel plate 1a and the assembly device for the main shaft 2-rotor 1B can be integrated. If such an assembling apparatus is used, the punched end plate 1c and laminated steel plate 1a are sequentially laminated on the main shaft 2, and when punching is completed to a predetermined thickness, the permanent magnet 1b is inserted and fixed from above. There is also a method in which the member 3B is fixed to the main shaft, and the efficiency of the manufacturing process can be further increased.

  As described above, according to the electric compressor according to the third embodiment, the rotor 1B is sandwiched between the step 2a formed on the main shaft 2 and the fixing member 3B fixed to the lower end of the rotor 1B. Axial positioning and fixation are possible. Therefore, according to the electric compressor according to the third embodiment, it is possible to easily position the main shaft 2 in the axial direction and fix the main shaft 2 and the rotor 1B without using a complicated structure. It is possible to suppress the deterioration of characteristics. Further, since one end of the positioning pin 1i is engaged with the positioning recess 3aB of the fixing member 3B, positioning and fixing in the circumferential direction can be performed reliably. Furthermore, since the caulking process using rivets can be omitted, the number of manufacturing steps can be reduced. In addition, since the fixing member 3B has a function as a fixing member, a function as a balance weight, and a function as an end plate, the number of parts can be reduced accordingly.

  Therefore, according to the electric compressor according to Embodiment 3, the rotor 1B can be assembled without heating, and the deterioration of the magnet characteristics due to heating can be significantly suppressed. Further, energy for heating the rotor 1B is not required, and the time for heating and cooling the rotor 1B can be shortened, leading to reduction in man-hours, time and cost required for manufacturing. Also, by integrating some of the components, the number of components can be reduced.

  In addition, in FIG. 8, although the state which the positioning recessed part 3aB has not penetrated the fixing member 3B was shown as an example, you may penetrate the fixing member 3B by using the positioning recessed part 3aB as a positioning hole. However, also in this case, it assembles in the position where the tip of positioning pin 1i reached the positioning hole. The positioning pin 1i has a diameter larger than the diameter of the positioning hole 1h, and may be any rod-like member that can be press-fitted into the positioning hole 1h, and the material and shape thereof are not particularly limited. Furthermore, although it has been described that the main shaft 2 is press-fitted or fitted into the rotor 1B, it is assumed that the rotor 1B is press-fitted or fitted into the main shaft 2.

  As mentioned above, although the characteristic matter of this invention was divided and demonstrated to embodiment, a concrete structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention. In each embodiment, an electric compressor has been described as an example of a fluid machine. However, the fluid compressor in which the rotor according to each embodiment is mounted, for example, a pump that moves a liquid such as water or oil is used. Is also applicable.

  1 rotor, 1A rotor, 1B rotor, 1a laminated steel plate, 1b permanent magnet, 1c end plate, 1d end plate, 1e rivet, 1f balance weight, 1g-1 first through hole (inner diameter), 1g-2 first 2 through holes, 1g-3 third through hole, 1h positioning hole, 1h-1 first positioning hole, 1h-2 second positioning hole, 1h-3 third positioning hole, 1i positioning pin, 1j magnet insertion hole, 2 Main shaft, 2a step portion, 2b outer diameter, 2c eccentric pin portion, 3 fixing member, 3A fixing member, 3A-1 portion, 3A-2 portion, 3B fixing member, 3B-1 portion, 3B-2 portion, 3a positioning recess 3aA positioning recess, 3aB positioning recess, 10 shell, 11 sump, 12 suction pipe, 13 discharge pipe, 15 discharge space, 18 compression chamber, 20 stator, 24 swing scroll, 5 lap part, 26 orbiting scroll boss part, 27 thrust surface, 28 fixed scroll, 29 lap part, 30 discharge port, 31 frame, 32 subframe, 33 Oldham ring, 34 main bearing, 100 electric compressor, A compression mechanism part , B Drive mechanism part.

Claims (5)

A sealed container;
A compression mechanism that is disposed in the sealed container and compresses the fluid;
An electric motor disposed in the sealed container and driving the compression mechanism;
A main shaft connecting the compression mechanism and the electric motor,
The motor is
A stator with a multi-phase winding mounted on the iron core;
The main shaft is fixed, and the rotor is arranged on the inner peripheral surface side of the stator so as to be rotatable.
The rotor is
The outer diameter of the main shaft is substantially the same as or larger than the outer diameter of the main shaft, the first through hole through which the main shaft is inserted, the magnet insertion hole into which a permanent magnet is mounted, and the circumference of the rotor A laminated steel plate in which a plurality of steel plates each having a first positioning hole into which a positioning pin that determines the position in the direction is press-fitted are laminated;
A second through hole through which the main shaft is inserted, and a positioning recess in which a tip of the positioning pin is mounted, and a fixing member provided on one surface side of the laminated steel sheet;
A positioning pin that press-fits into the first positioning hole formed in the laminated steel plate, determines a circumferential position of the rotor by attaching the tip to the fixing member, and fixes the laminated steel plate; Prepared,
On the upper end side of the main shaft, an outer diameter is larger than the diameter of the first through hole, and a step portion is formed that determines the position in the axial direction by engaging with the periphery of the first through hole.
In a state where the main shaft is inserted through the first through hole and the second through hole, the stepped portion is locked to a peripheral edge of the first through hole, and the positioning recess and the tip of the positioning pin are aligned. A fluid machine, wherein a fixing member is fixed to the main shaft. A third through hole through which the main shaft is inserted, and a second positioning hole into which the positioning pin is press-fitted, and end plates provided on both end surfaces of the laminated steel sheet;
A third positioning hole into which the positioning pin is press-fitted, and a balance weight provided on a side surface opposite to the laminated steel plate of at least one of the end plates;
The fixing member is
The fluid machine according to claim 1, wherein the fluid weight is provided on a side surface opposite to the end plate of the balance weight. A third through hole through which the main shaft is inserted, and a second positioning hole into which the positioning pin is press-fitted, and provided with end plates provided on both end surfaces of the laminated steel sheet,
The fixing member is
The fluid machine according to claim 1, which also has a function as a balance weight. The fixing member is
Consists of non-magnetic material,
The fluid machine according to claim 1, which also has functions as an end plate and a balance weight. A plurality of steel plates formed with a first through hole through which the main shaft is inserted, a magnet insertion hole into which a permanent magnet is mounted, and a first positioning hole into which a positioning pin for determining the circumferential position of the rotor is press-fitted A permanent magnet is mounted in a laminated steel sheet laminated with
Arranged on the upper and lower ends of the laminated steel plate are end plates in which third through holes into which the main shaft is inserted and second positioning holes into which the positioning pins are press-fitted are formed,
A balance weight having a third positioning hole into which the positioning pin is press-fitted is disposed on one side of the end plate;
A positioning pin is press-fitted into the first positioning hole, the second positioning hole, and the third positioning hole;
The main shaft is press-fitted or fitted into the first through hole and the third through hole,
A fixing member formed with a second through hole through which the main shaft is inserted and a positioning recess in which the tip of the positioning pin is mounted is inserted into the main shaft, and the positioning recess and the tip of the positioning pin are in alignment. The method of manufacturing a fluid machine, wherein the fixing member is fixed to the main shaft.

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