WO2017047338A1 - Hermetic electric compressor - Google Patents

Hermetic electric compressor Download PDF

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Publication number
WO2017047338A1
WO2017047338A1 PCT/JP2016/074591 JP2016074591W WO2017047338A1 WO 2017047338 A1 WO2017047338 A1 WO 2017047338A1 JP 2016074591 W JP2016074591 W JP 2016074591W WO 2017047338 A1 WO2017047338 A1 WO 2017047338A1
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WO
WIPO (PCT)
Prior art keywords
stator
fit
press
shrink
fitting
Prior art date
Application number
PCT/JP2016/074591
Other languages
French (fr)
Japanese (ja)
Inventor
郁男 江崎
茂樹 三浦
創 佐藤
小川　真
将成 宇野
紘史 島谷
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201680037659.1A priority Critical patent/CN107709775A/en
Priority to EP16846209.1A priority patent/EP3315774A4/en
Publication of WO2017047338A1 publication Critical patent/WO2017047338A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00

Definitions

  • the present invention relates to a sealed electric compressor in which a compression mechanism and an electric motor for driving the compression mechanism are built in a cylindrical sealed housing.
  • a rotary type or scroll type etc. type having a compression mechanism and an electric motor for driving the compression mechanism in a cylindrical closed housing
  • An electric compressor is used.
  • a stator (stator) of an electric motor is formed by laminating a plurality of annular punched and formed electromagnetic steel sheets to form a stator core of a predetermined thickness, and winding a coil winding thereon.
  • the stator is fixedly installed by shrink fitting or press fitting on the inner peripheral surface of the closed housing.
  • Patent Document 1 discloses a pair of upper and lower end portions of the outer peripheral edge of the stator fixed to upper and lower ring-shaped intermediate members, and the ring-shaped intermediate member is shrink-fit to the inner peripheral surface of the sealed housing.
  • the expansion groove portion extending in the cylinder axial direction is provided at a plurality of locations in the circumferential direction by partially expanding the inner diameter with respect to the portion where the stator on the sealed housing side is shrink-fit, and a portion that does not contact the outer periphery of the stator What is formed is shown.
  • Patent Document 2 in the plurality of bulging grooves provided in the circumferential direction, the closed housing and the stator core do not contact each other and are not shrink-fit or press-fit, but the stator core is Since the clamping force is applied from substantially the entire circumferential direction in the entire range in the thickness direction, the reduction effect of the compressive stress and the magnetic loss is small, and the improvement effect of the motor efficiency is limited. Further, in the cases shown in Patent Documents 3 and 4, since the shape of the stator core has to be changed, there is a problem that influence on the magnetic performance and the motor performance of the stator can not be avoided.
  • the present invention has been made in view of such circumstances, and does not change the shape of the stator core of the stator and does not particularly increase the size of the hermetic housing, and the compression at the time of shrink fitting or press fitting of the stator.
  • An object of the present invention is to provide a sealed electric compressor capable of reducing stress and magnetic loss and improving motor efficiency.
  • the sealed type electric compressor of the present invention adopts the following means. That is, the sealed electric compressor according to one aspect of the present invention is fixedly installed by shrink-fitting or press-fitting in the sealed housing, a cylindrical sealed housing, a compression mechanism fixedly installed in the sealed housing, And an electric motor for driving the compression mechanism through a drive shaft, wherein the electric motor is shrink-fit or press-fitted into the inner peripheral surface of the sealed housing only in a partial range h in the thickness direction of the stator.
  • the remaining part is made noncontact with the inner peripheral surface of the housing by expanding the inner diameter of the sealed housing.
  • only a partial range h in the thickness direction of the stator is shrink-fit or press-fit to the inner peripheral surface of the closed housing, and the remaining portion is expanded in diameter on the inner peripheral surface of the closed housing.
  • the thickness dimension of the stator so that the minimum holding force necessary for fixedly installing the electric motor in the sealed housing can be secured because the housing is configured to be noncontact with the inner circumferential surface of the housing. Only fit a part of the area h into the inner circumferential surface of the sealed housing by shrink fitting or press fitting, and do not shrink fit or press fit the remaining part, so as not to be in contact with the inner circumferential surface of the housing.
  • the motor efficiency can be improved to improve the motor performance without affecting the magnetic performance of the stator.
  • the diameter of only the portion of the sealed housing corresponding to the installation site of the stator may be enlarged, and the enlargement of the sealed housing and hence the sealed electric compressor can be avoided.
  • the thickness direction range h of the stator which is shrink fitted or pressed into the inner peripheral surface of the hermetic housing, is all
  • the thickness L is in the range of 0.05 L to 0.75 L with respect to the dimension L.
  • the thickness direction range h of the stator to be shrink-fit or press-fit on the inner peripheral surface of the hermetic housing is in the range of 0.05 L to 0.75 L with respect to the total thickness direction dimension L. Therefore, the compressive stress and magnetic loss due to the shrink fitting or press fitting can be reduced as much as possible while securing the holding force necessary for fixing and installing the electric motor. That is, by setting the range h in which the stator is shrink-fit or press-fit to 0.05L or more of the total thickness dimension L, the minimum necessary stator holding power is ensured, and the range h in which the shrink-fit or press-fit is performed.
  • the total thickness dimension L equal to or less than 0.75 L, compressive stress and magnetic loss of the stator due to shrink fitting or press fitting can be sufficiently reduced. Therefore, it is not necessary to change the shape of the stator, and it is possible to improve the motor efficiency and improve the motor performance while not affecting the magnetic performance.
  • the thickness direction range h in which the pressure fitting or press fitting is performed on the inner peripheral surface of the hermetic housing of the stator is The stator may have one end, another end, both ends, or a central portion in the thickness direction of the stator.
  • the thickness direction range h to be shrink-fit or press-fit on the inner peripheral surface of the closed housing of the stator is one end portion in the thickness direction of the stator, the other end portion, both end portions, the central portion Since the thickness direction range h in which the stator is shrink-fit or press-fit is one of the one end portion, the other end portion, both end portions or the center portion in the thickness direction of the stator, It may be set to an optimum position in consideration of diameter expansion processing, a contact distance at the time of inserting the stator into a shrink fit position of the sealed housing or a press fit position, and the like.
  • the shrink fit or press fit range h any of one end part, the other end part, both end sites, and the center part in the thickness direction of the stator, the mutual contact when inserting in the shrink fit or press fit position of the sealed housing Since the distance can be shortened, in particular the press-in can be facilitated.
  • At least a partial area h of the stator is shrink-fit or press-fit in the inner peripheral surface of the hermetic housing.
  • the portion corresponding to the portion to be cut is an inner diameter D having a shrink fit or press fit allowance, and the other part has the same inner diameter D as the shrink fit or press fit portion according to its position, the inner diameter D1 into which the stator can be inserted, Alternatively, the inner diameter D2 is larger than that.
  • the inner peripheral surface of the sealed housing has an inner diameter D having a shrink fit margin or a press fit margin, at least a portion corresponding to a portion where the partial range h of the stator is shrink fit or press fit;
  • the other part has the same inner diameter D as the shrink-fit or press-in part, the inner diameter D1 where the stator can be inserted, or the larger inner diameter D2, so the partial range h in the thickness direction of the stator Can be fixed by shrink-fitting or press-fitting on the inner peripheral surface of the sealed housing having an inner diameter D having a shrink-fit or press-fit margin, and the other part of the sealed housing is shrink-fitted or Insert the stator smoothly into the sealed housing by setting the same inner diameter D as the press-in portion and the inner diameter D2 which can be inserted or larger than the inner diameter D1 of the stator, It can be shrink fit or press fit in a fixed portion. Therefore, the stator can be fixedly installed without increasing the size of the closed housing
  • only a partial range h of the thickness dimension of the stator can be provided on the inner peripheral surface of the sealed housing so as to ensure the minimum holding force necessary for fixedly installing the electric motor in the sealed housing.
  • Compression stress and magnetic force due to shrink-fit or press-fit of the stator, by shrink-fit or press-fit against the housing and installing the remaining portion in non-contact with the inner circumferential surface of the housing without shrink-fit or press-fit Because losses can be minimized, motor efficiency can be improved to improve motor performance without affecting the magnetic performance of the stator in any way.
  • the diameter of only the portion of the sealed housing corresponding to the installation site of the stator may be enlarged, and the enlargement of the sealed housing and hence the sealed electric compressor can be avoided.
  • FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view corresponding to aa in FIG. It is a longitudinal cross-sectional view of the sealed type electric compressor of other embodiment (1). It is a longitudinal cross-sectional view of the hermetic type electric compressor of other embodiment (2). It is a longitudinal cross-sectional view of the sealed type electric compressor of other embodiment (3). It is a graph which shows the relationship between the magnetic loss by the shrinkage fit of the stator in the said sealed type electric compressor and stator holding power, and a shrinkage fit range rate.
  • FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention
  • FIG. 2 is a view corresponding to the aa cross section thereof
  • FIG. 6 is a schematic view of the hermetic electric compressor. A graph showing the relationship between the magnetic loss due to the shrink fit of the stator and the stator holding power and the shrink fit range ratio is shown.
  • hermetic-type electric compressor 1 a rotary-type hermetic electric compressor is exemplified as the hermetic-type electric compressor 1, but the invention is not limited to this, and the same applies to other types of hermetic-type electric compressor such as a scroll type. Of course it can be applied to
  • the hermetic electric compressor 1 includes a cylindrical hermetic housing 2 whose upper and lower ends are sealed by covers 3 and 4.
  • the electric motor 5 is fixedly installed in the upper part of the inside, and the electric motor 5 is electrically driven in the lower part.
  • a compression mechanism (rotary compression mechanism) 6 driven by a motor 5 is fixedly installed.
  • a plurality of mounting legs 7 are provided on the lower outer periphery of the sealed housing 2, and a sealed terminal 8 is provided on the upper part of the sealed housing 2 for supplying power to the electric motor 5 through the cover 3. ing.
  • a suction pipe 9 is connected to the lower part of the closed housing 2 for drawing the low pressure refrigerant gas returned from the refrigeration cycle side into the compression mechanism 6 via an accumulator (not shown).
  • a discharge pipe 10 is provided in the upper part of the closed housing 2 so as to penetrate the cover 3, and the high-temperature and high-pressure refrigerant gas compressed by the compression mechanism 6 can be discharged to the outside (refrigerating cycle).
  • the electric motor 5 is composed of a stator (stator) 11 and a rotor (rotor) 12, and the stator 11 is fixedly installed by shrink fitting or press-fitting on the inner peripheral surface of the sealed housing 2.
  • the drive shaft 13 is integrally coupled to the rotor 12, and the rotational drive force can be transmitted to the compression mechanism 6 via the drive shaft 13.
  • An eccentric portion 14 is provided at a lower portion of the drive shaft 13 in correspondence with the installation position of the rolling piston 19 of the compression mechanism 6.
  • the compression mechanism (rotary compression mechanism) 6 forms a cylinder chamber 16, and a cylinder body 15 fixedly installed in the sealed housing 2 at a position corresponding to the eccentric portion 14 of the drive shaft 13, and upper and lower surfaces of the cylinder body 15 And the upper bearing 17 and the lower bearing 18 which rotatably support the drive shaft 13, and the eccentric portion 14 of the drive shaft 13 are rotatably fitted to the cylinder chamber 16.
  • a rolling piston that rotates inside, a groove (not shown) slidably fitted in a groove (not shown) provided in the cylinder main body 15, and a vane (not shown) etc. that divides the inside of the cylinder chamber 16 into a suction side and a discharge side And is configured.
  • the compression mechanism 6 of such a configuration is well known.
  • a low pressure refrigerant gas is drawn into the cylinder chamber 16 of the compression mechanism 6 from the suction pipe 9 through the suction port 20.
  • the refrigerant gas is compressed by the rotation of the rolling piston 19 and then discharged into the discharge chamber 21 through a discharge port and a discharge valve (not shown), and then discharged into the closed housing 2 from there.
  • the high temperature and high pressure refrigerant gas discharged into the sealed housing 2 passes through the refrigerant passage and the like provided between the inner peripheral surface of the sealed housing 2 and the outer peripheral surface of the stator 11 of the electric motor 5 to the upper space in the sealed housing 2 It is led and discharged through the discharge pipe 10 to the outside (the refrigeration cycle side).
  • An oil pump 22 is provided at the lower end portion of the drive shaft 13, and lubricating oil filled in the bottom portion of the sealed housing 2 via an oil supply hole 23 or the like provided in the drive shaft 13 is It is possible to supply oil to lubricating parts such as bearings and sliding parts.
  • the stator 11 of the electric motor 5 reduces compression stress and magnetic loss (iron loss) at the time of shrink fitting or press fitting on the inner peripheral surface of the sealed housing 2, and motor efficiency In order to improve the following, it is shrink-fit or press-fit as follows.
  • the stator 11 of the electric motor 5 is formed by punching and forming electromagnetic steel plates in an annular shape, laminating a plurality of them to form a stator iron core 11A of a predetermined thickness L, and winding a coil winding 11B around its teeth portion It is. Since the stator core 11A here is shrink-fit or press-fit on the inner peripheral surface of the closed housing 2, the outer shape is not particularly deformed, and has a cylindrical shape.
  • the inner peripheral surface of the sealed housing 2 to which the stator core 11A of the stator 11 is shrink-fit or press-fit is formed by burning only a partial range h (h1) of the full thickness dimension L of the stator 11 to the inner peripheral surface of the housing
  • the inner diameter of the press-fitting portion 2A corresponding to the partial range h (h1) is D
  • the remaining portion has the same inner diameter D as the shrink-fitting or press-fitting portion 2A according to its position.
  • the inner diameter of the sealed housing 2 is such that the inner diameter of the shrink fit or press fit portion 2A of the stator 11 is the inner diameter D having a shrink fit margin or press fit margin, compared to the shrink fit or press fit portion 2A.
  • the inner diameter of the lower portion 2B is the same as the inner diameter D as the shrink-fit or press-fit portion 2A, and the inner diameter D of the upper portion 2C is smaller than the shrink-fit or press-fit portion 2A before welding the cover 3
  • the inner diameter D1 (D1> D) or an inner diameter D2 (D2> D1) larger than the inner diameter D1 (D1> D) is set so that the stator 11 can be inserted in this state.
  • the graph shown in FIG. 6 shows the relationship between the magnetic loss and the stator holding power due to the shrink fitting of the stator 11 in the hermetic motor compressor 1 and the shrink fitting range ratio (h (h1) / L).
  • the thickness direction range h (h1) of the stator 11 to be shrink-fitted or press-fit is set to the dimension L of the entire thickness direction of the stator 11 However, it is necessary to make it 0.05L or more. Further, in order to sufficiently reduce the compressive stress and magnetic loss of the stator 11 due to the shrink fitting or press fitting, the thickness direction range h (h1) of the stator 11 to be shrink fitted or press fitted is the dimension of the entire thickness direction of the stator 11 It is necessary to set it as 0.75 L or less to L. A more preferable range h (h1) is 1 / 3L ⁇ h (h1) ⁇ 1 / 2L.
  • the following effects can be obtained.
  • the compression mechanism 6 when the compression mechanism 6 is driven through the drive shaft 13 by supplying electric power to the electric motor 5 and rotating the rotor 12, low pressure refrigerant gas is supplied through the suction pipe 9 After being drawn into the cylinder chamber 16 of the compression mechanism 6 and compressed by the rotation of the rolling piston 19, it is discharged into the discharge chamber 21 through a discharge port and a discharge valve (not shown).
  • the high-temperature and high-pressure compressed gas is discharged from the discharge chamber 21 into the inside of the sealed housing 2, and then, is passed through the refrigerant passage formed between the inner peripheral surface of the closed housing 2 and the outer peripheral surface of the stator 11.
  • the air is led to the upper space of the fuel cell and discharged from there through the discharge pipe 10 to the refrigeration cycle side.
  • the electric motor 5 is rotated at a controlled rotational speed and keeps driving the compression mechanism 6.
  • the stator 11 When assembling the electric motor 5, the stator 11 is inserted into the sealed housing 2 before welding the cover 3, and a shrink fit or press-fit range h which is a partial range of the thickness direction dimension L of the stator 11 (H1) needs to be shrink-fit or press-fit to the shrink-fit or press-fit portion 2A of the sealed housing 2, and thereafter, the electric motor 5 is integrated in the closed housing 2 by incorporating the rotor 12 integrated with the drive shaft 13. It will be incorporated inside.
  • a partial range h (h1) of the thickness direction of the stator 11 of the electric motor 5 is shrink-fit or press-fit on the inner peripheral surface of the shrink-fit or press-fit portion 2A of the sealed housing 2
  • the inner diameter of the sealed housing 2 is expanded (expanded to D1 or D2) so that the inner peripheral surface of the housing is not in contact. That is, when the dimension in the entire thickness direction of the stator 11 is L, only the shrink fit or press fit range h (h1) which is a part thereof is set as the shrink fit or press fit range, “0.05L ⁇ h (h1) ⁇
  • the range is set to 0.75 L, preferably, “1/3 L ⁇ h (h1) ⁇ 1/2 L”.
  • h (h1) of the thickness direction dimension of the stator 11 is sealed so that the minimum holding force necessary for fixing and installing the electric motor 5 in the sealed housing 2 can be secured.
  • the diameter of only a part of the hermetic housing 2 corresponding to the installation site of the stator 11 may be enlarged, and the enlargement of the hermetic housing 2 and hence the hermetic electric compressor 1 can be avoided. Furthermore, since the remaining portion of the stator 11 which is not shrink-fit or press-fit is not in contact with the inner circumferential surface of the hermetic housing 2 due to the gap S, the magnetic excitation force on the stator 11 side is propagated to the hermetic housing 2 It is also possible to suppress the generation of noise due to noise.
  • the shrink fit or press-fit range h (h1) of the stator 11 with respect to the dimension L in the entire thickness direction of the stator 11 is in the range of 0.05L ⁇ h (h1) ⁇ 0.75L, preferably 1 / 3L ⁇ Since h (h1) ⁇ 1/2, the compressive stress and magnetic loss of the stator 11 by shrink fitting or press fitting are as much as possible while securing the holding force necessary for fixing and installing the electric motor 5. It can be made smaller. That is, by setting the range h (h1) in which the stator 11 is shrink-fit or press-fit to 0.05 L or more of the total thickness dimension L, the minimum necessary stator holding power is secured, and the shrink-fit or press-fit is performed. By setting the range h (h1) to be equal to or less than 0.75 L of the total thickness direction dimension L, the compressive stress and magnetic loss of the stator 11 due to shrink fitting or press fitting can be sufficiently reduced.
  • the press-fit portion 2A corresponding to the portion of the inner circumferential surface of the sealed housing 2 on which the partial range h (h1) of the stator 11 is shrink-fitted or press-fitted is the inside diameter D having a shrink-fit or press-fit allowance.
  • the lower part 2B of the shrink fit or press fit portion 2A has the same inner diameter D as the shrink fit or press fit part 2A, and the upper part 2C has an inner diameter D1 that the stator 11 can insert or larger D2
  • the lower part 2B of the shrink fit or press fit portion 2A has the same inner diameter D as the shrink fit or press fit part 2A
  • the upper part 2C has an inner diameter D1 that the stator 11 can insert or larger D2
  • a partial range h (h1) in the thickness direction of the stator 11 is fixed by shrink-fitting or press-fitting on the inner peripheral surface of the sealed housing 2 having an inner diameter D having a shrink-fit or press-fit margin.
  • the other part 2B, 2C of the sealed housing 2 has the same inner diameter D as the shrink-fit or press-in part 2A and the inner diameter D1 for inserting the stator 11 or the inner diameter D2 larger than that.
  • the stator 11 can be smoothly inserted from the upper end portion of the closed housing 2 with 3 removed, and can be shrink-fit or press-fit to the shrink-fit or press-fit portion 2A.
  • the diameter of the closed housing 2 is not particularly increased by appropriately enlarging the diameter of only the upper part 2C of the necessary part of the closed housing 2, for example, the upper part 2C than the shrink fit or press fit part 2A of the closed housing 2.
  • the stator 11 can be fixedly installed, and the enlargement of the sealed housing 2 and hence the sealed electric compressor 1 can be avoided.
  • one end portion on the upper end side is set as a partial range h (h1) to be shrink-fit or press-fit with respect to the full thickness direction dimension L of the stator 11
  • h partial range
  • the stator 11 can be inserted from the upper end of the sealed housing 2 and can be shrink fit or press fit.
  • the other end portion on the lower end side is set as a partial range h (h 2) for shrink fitting or press fitting;
  • the inner diameter of the shrink fit or press fit portion 2D is an inner diameter D having a shrink fit margin or a press fit margin, and the inner diameter of the upper portion 2E is the same inner diameter D as the shrink fit or press fit portion 2D than the shrink fit or press fit portion 2D.
  • the inner diameter D1 (D1> D) or an inner diameter D2 larger than that (D2> D1) is adopted.
  • only the lower half of the sealed housing 2 may have a gap S between the outer periphery of the stator 11 and the diameter may be increased so as not to contact each other. , And may be shrink-fit or press-fit.
  • the inner diameter of the shrink-fit or press-fit portion 2G or 2H is an inner diameter D having a shrink-fit or press-fit allowance, and the inner diameter of any one of the upper portion 2I and the lower portion 2J than the shrink-fit or press-fit portion 2G or 2H is Since the same inner diameter D may be used as the shrink-fit or press-fit portions 2G and 2H, the same inner diameter D or an inner diameter D1 larger than that (D1> D) or an inner diameter D2 larger than D1 (D2> D1), and the other inner diameter The inner diameter D1 (D1> D) or a larger inner diameter D2 (D2> D1) to which the stator 11 can be easily inserted before welding the covers 3 and 4 is used.
  • the gap S is made between the outer periphery of the stator 11 It is set as the set up.
  • the same effect as that of the first embodiment can be obtained.
  • the total holding power due to the partial ranges h3 and h4 in which shrinkage fitting or press fitting is set separately in plural places fixes the electric motor 5 to the sealed housing 2 It should be possible to ensure the minimum holding power necessary for installation.
  • the central region excluding both end portions is set as a partial range h (h5) for shrink fitting or press fitting;
  • the inner diameter of the fitting or press-in portion 2L is an inner diameter D having a shrink-fitting or press-in allowance, and the inner diameters of the upper portion 2M and the lower portion 2N are easier to insert the stator 11 than the shrink-fitting or press-in portion 2L.
  • the gap S is set between the outer periphery of the stator 11 and the inner periphery D1.
  • the same effects as those of the first embodiment can be obtained by adopting the configuration as described above.
  • the inner diameter of the upper portion 2M and the lower portion 2N of the sealed housing 2 corresponding to the remaining portion excluding the partial range h (h5) of the stator 11 may be D2, and the inner diameter of the other portions may be D1.
  • the thickness direction range h (sintered or press-fit into the inner peripheral surface of the sealed housing 2 of the stator 11)
  • the thickness direction range h (h1 to h5) in which the stator 11 is shrink-fitted or press-fitd by setting h1 to h5) to one of the one end portion, the other end portion, both end portions and the center portion in the thickness direction of the stator 11. ) May be set at any one of the one end portion, the other end portion, both end portions or the central portion in the thickness direction of the stator 11, and diameter expansion processing of the sealed housing 2 or shrink fitting position of the stator 11 or It becomes possible to set to the optimal position which considered the contact distance etc. at the time of inserting in a press-fit position.
  • the setting of the thickness direction range h (h1 to h5) in which the stator 11 is shrink-fitted or press-fit can be given freedom, and it is selected when determining the outer shape of the sealed housing 2 and the fixing structure of the stator 11.
  • the degree of freedom can be secured.
  • the shrink-fit or press-fit range h (h1 to h5) is any one of the one end portion, the other end portion, both end portions, and the center portion in the thickness direction of the stator 11, the shrink fit or press-fit of the sealed housing 2 The distance of contact with one another upon insertion into the position can be reduced and in particular the press-in can be made easier.
  • the present invention is not limited to the invention according to the above-described embodiment, and appropriate modifications can be made without departing from the scope of the invention.
  • the above-mentioned embodiment explained an example applied to a single cylinder rotary type closed type electric compressor 1 as an example of the closed type electric compressor 1, it is not limited to this but a multi-cylinder rotary A variety of other enclosed electric compressors of the enclosed type in which the electric motor 5 is fixedly installed in the enclosed electric compressor or the enclosed housing 2, for example, the scroll type enclosed electric compressor or the electric
  • the present invention can be widely applied to a multistage compressor or the like incorporating a plurality of compression mechanisms driven by the motor 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The present invention reduces compressive stress and magnetic loss during shrink-fitting or press-fitting of a stator, and improves motor efficiency, without the need to change the shape of a stator core of the stator and without significantly enlarging a sealed housing. A hermetic electric compressor (1) in which an electric motor (5) and a compression mechanism (6) are fixedly installed within a cylindrical sealed housing (2) and the compression mechanism (6) can be driven by the electric motor (5) via a drive shaft (13), wherein the electric motor (5) is installed by shrink-fitting or press-fitting so that only a partial range (h1 or h5) of the motor in the thickness direction of the stator (11) is fixed on an inner peripheral surface of the sealed housing (2), and the remaining portion of the motor is in non-contact with the housing inner peripheral surface due to expansion of the inner diameter of the sealed housing (2).

Description

密閉型電動圧縮機Sealed type electric compressor
　本発明は、円筒状の密閉ハウジング内に、圧縮機構と、該圧縮機構を駆動する電動モータとが内蔵されている密閉型電動圧縮機に関するものである。 The present invention relates to a sealed electric compressor in which a compression mechanism and an electric motor for driving the compression mechanism are built in a cylindrical sealed housing.
　冷凍・空調装置あるいは各種ヒートポンプ等に適用される冷媒圧縮機として、円筒状をした密閉ハウジング内に圧縮機構と、該圧縮機構を駆動する電動モータとを内蔵したロータリ式あるいはスクロール式等の密閉型電動圧縮機が用いられている。かかる密閉型電動圧縮機において、電動モータのステータ（固定子）は、環状に打ち抜き成形された電磁鋼板を複数枚積層して所定厚さの固定子鉄心を形成し、それにコイル巻線を巻装した構成とされており、該電動モータを密閉ハウジング内に内蔵する際、ステータを密閉ハウジングの内周面に焼嵌めもしくは圧入することにより固定設置している。 As a refrigerant compressor applied to a refrigeration / air conditioning system or various heat pumps, etc., a rotary type or scroll type etc. type having a compression mechanism and an electric motor for driving the compression mechanism in a cylindrical closed housing An electric compressor is used. In such a sealed type electric compressor, a stator (stator) of an electric motor is formed by laminating a plurality of annular punched and formed electromagnetic steel sheets to form a stator core of a predetermined thickness, and winding a coil winding thereon. When the electric motor is built in the closed housing, the stator is fixedly installed by shrink fitting or press fitting on the inner peripheral surface of the closed housing.
　しかるに、上記の如く、電動モータのステータを密閉ハウジングの内周面に焼嵌めまたは圧入することにより固定設置すると、ステータの固定子鉄心に焼嵌めまたは圧入時の締付け力に見合った圧縮応力が残留することになる。このように、固定子鉄心に圧縮応力が残留すると、固定子鉄心を構成する磁性鋼板の透磁率が低下し、鉄損（磁気損失）が増加することから、モータ効率が低下することが知られている。 However, as described above, when the stator of the electric motor is fixedly installed by shrink fitting or press fitting on the inner peripheral surface of the sealed housing, compressive stress corresponding to the tightening force at the time of shrink fitting or press fitting remains in the stator core of the stator. It will be done. As described above, it is known that when compressive stress remains in the stator core, the magnetic permeability of the magnetic steel plates constituting the stator core decreases and the iron loss (magnetic loss) increases, so that the motor efficiency decreases. ing.
　そこで、焼嵌めや圧入時にステータに加わる圧縮応力、磁気損失を低減すべく、特許文献１－４等に示されるような技術が提示されている。特許文献１には、ステータ外周縁の上下端部に上下一対のリング状中間部材に固着し、そのリング状中間部材を密閉ハウジングの内周面に焼嵌めしたものが示され、特許文献２には、密閉ハウジング側のステータを焼嵌めする部位に対し、内径を部分的に拡張して筒軸方向に延びる膨出溝部を周方向の複数箇所に設け、ステータの外周と非接触となる部分を形成したものが示されている。 Therefore, in order to reduce the compressive stress and magnetic loss applied to the stator at the time of shrink fitting or press fitting, techniques as disclosed in Patent Documents 1 to 4 and the like are presented. Patent Document 1 discloses a pair of upper and lower end portions of the outer peripheral edge of the stator fixed to upper and lower ring-shaped intermediate members, and the ring-shaped intermediate member is shrink-fit to the inner peripheral surface of the sealed housing. The expansion groove portion extending in the cylinder axial direction is provided at a plurality of locations in the circumferential direction by partially expanding the inner diameter with respect to the portion where the stator on the sealed housing side is shrink-fit, and a portion that does not contact the outer periphery of the stator What is formed is shown.
　また、特許文献３，４には、密閉ハウジングの内周面に焼嵌めされるステータの外周部位に、固定子鉄心の外径を変化させ、ハウジング内周面に焼嵌めされる部位と、ハウジング内周面に対して非接触となる部位とを形成することにより、ステータの厚さ方向の一部範囲のみを焼嵌めまたは圧入して固定設置するようにしたものが示されている。 In Patent Documents 3 and 4, the outer diameter of the stator iron core is changed at the outer peripheral portion of the stator that is shrink-fitted to the inner peripheral surface of the sealed housing, and the portion that is shrink-fitted to the inner peripheral surface of the housing It is shown that only a partial range in the thickness direction of the stator is shrink-fitted or press-fitted and fixedly installed by forming a portion which is not in contact with the inner peripheral surface.
特開２００９－２９９５２４号公報JP, 2009-299524, A 特開２０１０－１７４７７２号公報JP, 2010-174772, A 特開２０１１－１５２０４１号公報JP, 2011-152041, A 特開２０１４－１１７０９０号公報JP, 2014-117090, A
　しかし、上記特許文献に示すものでは、焼嵌めまたは圧入時にステータに残留する圧縮応力や鉄損（磁気損失）を低減し、モータ効率を改善することができる反面、特許文献１に示すものでは、固定子鉄心と密閉ハウジング間にリング状中間部材を介装しなければならず、その分だけ、密閉ハウジングを大径化もしくは固定子鉄心を小径化する必要があるため、モータ性能に影響を及ぼすだけではなく、組立て工数や部品点数の増加により構造が複雑化、高コスト化する等の課題を有していた。 However, in the above-mentioned patent documents, while compression stress and iron loss (magnetic loss) which remain to a stator at the time of shrinkage fitting or press-fitting can be reduced and motor efficiency can be improved, in what is shown in patent documents 1, Since it is necessary to interpose the ring-shaped intermediate member between the stator core and the closed housing, and it is necessary to increase the diameter of the closed housing or reduce the diameter of the stator core by that amount, it affects the motor performance. Not only that, there are problems such as the structure becoming complicated and the cost becoming high due to the increase in the number of assembling processes and the number of parts.
　特許文献２に示すものでは、周方向に設けられる複数の膨出溝部において、密閉ハウジングと固定子鉄心とが互いに非接触となり、焼嵌めまたは圧入されることはないが、固定子鉄心には、厚さ方向の全範囲において略全周方向から締め付け力が加わるため、圧縮応力や磁気損失の低減効果は小さく、モータ効率の改善効果は限定的であった。また、特許文献３，４に示すものでは、固定子鉄心の形状を変更しなければならないため、ステータの磁気性能やモータ性能に影響を及ぼすことは避けられない等の課題が存在していた。 According to Patent Document 2, in the plurality of bulging grooves provided in the circumferential direction, the closed housing and the stator core do not contact each other and are not shrink-fit or press-fit, but the stator core is Since the clamping force is applied from substantially the entire circumferential direction in the entire range in the thickness direction, the reduction effect of the compressive stress and the magnetic loss is small, and the improvement effect of the motor efficiency is limited. Further, in the cases shown in Patent Documents 3 and 4, since the shape of the stator core has to be changed, there is a problem that influence on the magnetic performance and the motor performance of the stator can not be avoided.
　本発明は、このような事情に鑑みてなされたものであって、ステータの固定子鉄心の形状を変えずに、また密閉ハウジングを特段大型化することなく、ステータの焼嵌めもしくは圧入時の圧縮応力および磁気損失を低減し、モータ効率を改善することができる密閉型電動圧縮機を提供することを目的とする。 The present invention has been made in view of such circumstances, and does not change the shape of the stator core of the stator and does not particularly increase the size of the hermetic housing, and the compression at the time of shrink fitting or press fitting of the stator. An object of the present invention is to provide a sealed electric compressor capable of reducing stress and magnetic loss and improving motor efficiency.
　上記した課題を解決するために、本発明の密閉型電動圧縮機は、以下の手段を採用している。
　すなわち、本発明の一態様にかかる密閉型電動圧縮機は、円筒状の密閉ハウジングと、前記密閉ハウジング内に固定設置された圧縮機構と、前記密閉ハウジング内に焼嵌めもしくは圧入により固定設置され、駆動軸を介して前記圧縮機構を駆動する電動モータと、を備え、前記電動モータは、そのステータの厚さ方向の一部範囲ｈのみが前記密閉ハウジングの内周面に焼嵌めもしくは圧入されることにより固定設置され、残余の部分は前記密閉ハウジングの内径を拡径することによりハウジング内周面に対して非接触とされている。 In order to solve the above-mentioned subject, the sealed type electric compressor of the present invention adopts the following means.
That is, the sealed electric compressor according to one aspect of the present invention is fixedly installed by shrink-fitting or press-fitting in the sealed housing, a cylindrical sealed housing, a compression mechanism fixedly installed in the sealed housing, And an electric motor for driving the compression mechanism through a drive shaft, wherein the electric motor is shrink-fit or press-fitted into the inner peripheral surface of the sealed housing only in a partial range h in the thickness direction of the stator. Thus, the remaining part is made noncontact with the inner peripheral surface of the housing by expanding the inner diameter of the sealed housing.
　本発明の一態様によれば、ステータの厚さ方向の一部範囲ｈのみが密閉ハウジングの内周面に焼嵌めもしくは圧入され、残余の部分が密閉ハウジングの内周面を拡径することによりハウジング内周面に対して非接触となる構成とされているため、電動モータを密閉ハウジング内に固定設置するために必要な最小限の保持力を確保し得るように、ステータの厚さ方向寸法の一部範囲ｈのみを密閉ハウジングの内周面に対して焼嵌めもしくは圧入し、残余の部分を焼嵌めもしくは圧入せずに、ハウジング内周面に対して非接触となるように設置することにより、ステータの焼嵌めもしくは圧入による圧縮応力および磁気損失を最小限化することができる。従って、ステータの磁気性能に何ら影響を及ぼすことなく、モータ効率を改善してモータ性能を向上することができる。また、密閉ハウジングのステータの設置部位に対応する部分のみを拡径すればよく、密閉ハウジング、ひいては密閉型電動圧縮機の大型化を回避することができる。 According to one aspect of the present invention, only a partial range h in the thickness direction of the stator is shrink-fit or press-fit to the inner peripheral surface of the closed housing, and the remaining portion is expanded in diameter on the inner peripheral surface of the closed housing. The thickness dimension of the stator so that the minimum holding force necessary for fixedly installing the electric motor in the sealed housing can be secured because the housing is configured to be noncontact with the inner circumferential surface of the housing. Only fit a part of the area h into the inner circumferential surface of the sealed housing by shrink fitting or press fitting, and do not shrink fit or press fit the remaining part, so as not to be in contact with the inner circumferential surface of the housing. By this, it is possible to minimize the compressive stress and magnetic loss due to shrinkage fitting or press fitting of the stator. Therefore, the motor efficiency can be improved to improve the motor performance without affecting the magnetic performance of the stator. In addition, the diameter of only the portion of the sealed housing corresponding to the installation site of the stator may be enlarged, and the enlargement of the sealed housing and hence the sealed electric compressor can be avoided.
　さらに、本発明の一態様の密閉型電動圧縮機は、上記の密閉型電動圧縮機において、前記密閉ハウジングの内周面に焼嵌めもしくは圧入される前記ステータの厚さ方向範囲ｈは、その全厚さ方向寸法Ｌに対して０．０５Ｌ～０．７５Ｌの範囲とされている。 Furthermore, in the hermetic electric compressor according to one aspect of the present invention, in the hermetic electric compressor described above, the thickness direction range h of the stator, which is shrink fitted or pressed into the inner peripheral surface of the hermetic housing, is all The thickness L is in the range of 0.05 L to 0.75 L with respect to the dimension L.
　本発明の一態様によれば、密閉ハウジングの内周面に焼嵌めもしくは圧入されるステータの厚さ方向範囲ｈを、その全厚さ方向寸法Ｌに対して０．０５Ｌないし０．７５Ｌの範囲としているため、電動モータを固定設置するために必要な保持力を確保しながら、焼嵌めもしくは圧入による圧縮応力および磁気損失を可及的に小さくすることができる。つまり、ステータを焼嵌めもしくは圧入する範囲ｈを、その全厚さ方向寸法Ｌの０．０５Ｌ以上とすることにより、必要最小限のステータ保持力を確保し、また、焼嵌めもしくは圧入する範囲ｈを全厚さ方向寸法Ｌの０．７５Ｌ以下とすることにより、焼嵌めもしくは圧入によるステータの圧縮応力および磁気損失を十分小さくすることができる。従って、ステータの形状を変える必要がなく、磁気性能に影響を及ぼさないようにしつつ、モータ効率を改善してモータ性能を向上することができる。 According to one aspect of the present invention, the thickness direction range h of the stator to be shrink-fit or press-fit on the inner peripheral surface of the hermetic housing is in the range of 0.05 L to 0.75 L with respect to the total thickness direction dimension L. Therefore, the compressive stress and magnetic loss due to the shrink fitting or press fitting can be reduced as much as possible while securing the holding force necessary for fixing and installing the electric motor. That is, by setting the range h in which the stator is shrink-fit or press-fit to 0.05L or more of the total thickness dimension L, the minimum necessary stator holding power is ensured, and the range h in which the shrink-fit or press-fit is performed. By making the total thickness dimension L equal to or less than 0.75 L, compressive stress and magnetic loss of the stator due to shrink fitting or press fitting can be sufficiently reduced. Therefore, it is not necessary to change the shape of the stator, and it is possible to improve the motor efficiency and improve the motor performance while not affecting the magnetic performance.
　さらに、本発明の一態様の密閉型電動圧縮機は、上述のいずれかの密閉型電動圧縮機において、前記ステータの前記密閉ハウジングの内周面に焼嵌めもしくは圧入される厚さ方向範囲ｈは、前記ステータの厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとされている。 Furthermore, in the hermetic electric compressor according to one aspect of the present invention, in any of the hermetic electric compressors described above, the thickness direction range h in which the pressure fitting or press fitting is performed on the inner peripheral surface of the hermetic housing of the stator is The stator may have one end, another end, both ends, or a central portion in the thickness direction of the stator.
　本発明の一態様によれば、ステータの密閉ハウジングの内周面に焼嵌めもしくは圧入される厚さ方向範囲ｈが、ステータの厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとされているため、ステータの焼嵌めもしくは圧入される厚さ方向範囲ｈを、ステータの厚さ方向の一端部位、他端部位、両端部位または中央部位のいずれかの位置において、密閉ハウジングの拡径加工やステータを密閉ハウジングの焼嵌め位置や圧入位置に挿入する際の接触距離等を考慮して最適な位置に設定すればよい。従って、ステータを焼嵌めもしくは圧入する際の厚さ方向範囲ｈの設定に自由度を持たせることができ、密閉ハウジングの外形形状やステータの固定構造の決定に際して、選択の自由度を確保することができる。また、焼嵌めもしくは圧入範囲ｈをステータの厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとすることにより、密閉ハウジングの焼嵌めもしくは圧入位置に挿入する際の互いの接触距離を短くすることができるため、特に圧入を容易化することができる。 According to one aspect of the present invention, the thickness direction range h to be shrink-fit or press-fit on the inner peripheral surface of the closed housing of the stator is one end portion in the thickness direction of the stator, the other end portion, both end portions, the central portion Since the thickness direction range h in which the stator is shrink-fit or press-fit is one of the one end portion, the other end portion, both end portions or the center portion in the thickness direction of the stator, It may be set to an optimum position in consideration of diameter expansion processing, a contact distance at the time of inserting the stator into a shrink fit position of the sealed housing or a press fit position, and the like. Therefore, it is possible to give freedom in setting the thickness direction range h when shrink fitting or press fitting the stator, and to secure the freedom of choice when determining the outer shape of the hermetic housing and the fixing structure of the stator. Can. Also, by making the shrink fit or press fit range h any of one end part, the other end part, both end sites, and the center part in the thickness direction of the stator, the mutual contact when inserting in the shrink fit or press fit position of the sealed housing Since the distance can be shortened, in particular the press-in can be facilitated.
　さらに、本発明の一態様の密閉型電動圧縮機は、上述のいずれかの密閉型電動圧縮機において、前記密閉ハウジングの内周面は、少なくとも前記ステータの一部範囲ｈが焼嵌めもしくは圧入される部位に対応した部分が、焼嵌め代もしくは圧入代を有する内径Ｄとされ、他の部分は、その位置に応じて焼嵌めもしくは圧入部分と同じ内径Ｄ、前記ステータが挿入可能な内径Ｄ１、もしくはそれより大きい内径Ｄ２とされている。 Furthermore, in the hermetic electric compressor according to one aspect of the present invention, in any of the hermetic electric compressors described above, at least a partial area h of the stator is shrink-fit or press-fit in the inner peripheral surface of the hermetic housing. The portion corresponding to the portion to be cut is an inner diameter D having a shrink fit or press fit allowance, and the other part has the same inner diameter D as the shrink fit or press fit portion according to its position, the inner diameter D1 into which the stator can be inserted, Alternatively, the inner diameter D2 is larger than that.
　本発明の一態様によれば、密閉ハウジングの内周面は、少なくともステータの一部範囲ｈが焼嵌めもしくは圧入される部位に対応した部分を、焼嵌め代もしくは圧入代を有する内径Ｄとし、他の部分を、その位置に応じて焼嵌めもしくは圧入部分と同じ内径Ｄ、ステータが挿入可能な内径Ｄ１、もしくはそれより大きい内径Ｄ２とされているため、ステータの厚さ方向の一部範囲ｈを、焼嵌め代もしくは圧入代を有する内径Ｄとした密閉ハウジングの内周面に焼嵌めもしくは圧入して固定設置することができ、密閉ハウジングの他の部分を、その位置に応じて焼嵌めもしくは圧入部分と同じ内径Ｄ、ステータを挿入可能な内径Ｄ１もしくはそれより大きい内径Ｄ２としておくことにより、ステータをスムーズに密閉ハウジング内に挿入し、所定部分に焼嵌めもしくは圧入することができる。従って、密閉ハウジングの必要な部分のみを適宜部分的に拡径することにより、密閉ハウジングを特段大型化することなく、ステータを固定設置することができ、密閉ハウジング、ひいては密閉型電動圧縮機の大型化を回避することができる。 According to one aspect of the present invention, the inner peripheral surface of the sealed housing has an inner diameter D having a shrink fit margin or a press fit margin, at least a portion corresponding to a portion where the partial range h of the stator is shrink fit or press fit; Depending on the position, the other part has the same inner diameter D as the shrink-fit or press-in part, the inner diameter D1 where the stator can be inserted, or the larger inner diameter D2, so the partial range h in the thickness direction of the stator Can be fixed by shrink-fitting or press-fitting on the inner peripheral surface of the sealed housing having an inner diameter D having a shrink-fit or press-fit margin, and the other part of the sealed housing is shrink-fitted or Insert the stator smoothly into the sealed housing by setting the same inner diameter D as the press-in portion and the inner diameter D2 which can be inserted or larger than the inner diameter D1 of the stator, It can be shrink fit or press fit in a fixed portion. Therefore, the stator can be fixedly installed without increasing the size of the closed housing by enlarging the diameter of only the necessary part of the closed housing appropriately, and the large size of the closed housing and hence the large size of the sealed electric compressor can be obtained. Can be avoided.
　本発明によると、電動モータを密閉ハウジング内に固定設置するために必要な最小限の保持力を確保し得るように、ステータの厚さ方向寸法の一部範囲ｈのみを密閉ハウジングの内周面に対して焼嵌めもしくは圧入し、残余の部分を焼嵌めもしくは圧入せずに、ハウジング内周面に対して非接触となるように設置することによって、ステータの焼嵌めもしくは圧入による圧縮応力および磁気損失を最小限化することができるため、ステータの磁気性能に何ら影響を及ぼすことなく、モータ効率を改善してモータ性能を向上することができる。また、密閉ハウジングのステータの設置部位に対応する部分のみを拡径すればよく、密閉ハウジング、ひいては密閉型電動圧縮機の大型化を回避することができる。 According to the present invention, only a partial range h of the thickness dimension of the stator can be provided on the inner peripheral surface of the sealed housing so as to ensure the minimum holding force necessary for fixedly installing the electric motor in the sealed housing. Compression stress and magnetic force due to shrink-fit or press-fit of the stator, by shrink-fit or press-fit against the housing and installing the remaining portion in non-contact with the inner circumferential surface of the housing without shrink-fit or press-fit Because losses can be minimized, motor efficiency can be improved to improve motor performance without affecting the magnetic performance of the stator in any way. In addition, the diameter of only the portion of the sealed housing corresponding to the installation site of the stator may be enlarged, and the enlargement of the sealed housing and hence the sealed electric compressor can be avoided.
本発明の第１実施形態に係る密閉型電動圧縮機の縦断面図である。FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention. 図１におけるａ－ａ断面相当図である。FIG. 2 is a cross-sectional view corresponding to aa in FIG. 他の実施形態（１）の密閉型電動圧縮機の縦断面図である。It is a longitudinal cross-sectional view of the sealed type electric compressor of other embodiment (1). 他の実施形態（２）の密閉型電動圧縮機の縦断面図である。It is a longitudinal cross-sectional view of the hermetic type electric compressor of other embodiment (2). 他の実施形態（３）の密閉型電動圧縮機の縦断面図である。It is a longitudinal cross-sectional view of the sealed type electric compressor of other embodiment (3). 上記密閉型電動圧縮機でのステータの焼嵌めによる磁気損失およびステータ保持力と焼嵌め範囲率との関係を示すグラフである。It is a graph which shows the relationship between the magnetic loss by the shrinkage fit of the stator in the said sealed type electric compressor and stator holding power, and a shrinkage fit range rate.
　以下に、本発明にかかる実施形態について、図面を参照して説明する。
［第１実施形態］
　以下、本発明の第１実施形態について、図１、図２および図６を用いて説明する。
　図１には、本発明の第１実施形態に係る密閉型電動圧縮機の縦断面図、図２には、そのａ－ａ断面相当図、図６には、その密閉型電動圧縮機でのステータの焼嵌めによる磁気損失およびステータ保持力と焼嵌め範囲率との関係を示すグラフが示されている。
　ここでは、密閉型電動圧縮機１として、ロータリ式の密閉型電動圧縮機が例示されているが、これに限定されるものではなく、スクロール式等、他形式の密閉型電動圧縮機にも同様に適用できることはもちろんである。 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
First Embodiment
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2 and FIG.
FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to a first embodiment of the present invention, FIG. 2 is a view corresponding to the aa cross section thereof, and FIG. 6 is a schematic view of the hermetic electric compressor. A graph showing the relationship between the magnetic loss due to the shrink fit of the stator and the stator holding power and the shrink fit range ratio is shown.
Here, a rotary-type hermetic electric compressor is exemplified as the hermetic-type electric compressor 1, but the invention is not limited to this, and the same applies to other types of hermetic-type electric compressor such as a scroll type. Of course it can be applied to
　この密閉型電動圧縮機１は、上端部および下端部がカバー３，４によって密閉された円筒状の密閉ハウジング２を備え、その内部の上方部に電動モータ５が固定設置され、下方部に電動モータ５によって駆動される圧縮機構（ロータリ圧縮機構）６が固定設置された構成とされている。密閉ハウジング２の下部外周には、複数の据え付け脚７が設けられており、また、密閉ハウジング２の上部には、カバー３を貫通して電動モータ５に電力を給電する密封端子８が設けられている。 The hermetic electric compressor 1 includes a cylindrical hermetic housing 2 whose upper and lower ends are sealed by covers 3 and 4. The electric motor 5 is fixedly installed in the upper part of the inside, and the electric motor 5 is electrically driven in the lower part. A compression mechanism (rotary compression mechanism) 6 driven by a motor 5 is fixedly installed. A plurality of mounting legs 7 are provided on the lower outer periphery of the sealed housing 2, and a sealed terminal 8 is provided on the upper part of the sealed housing 2 for supplying power to the electric motor 5 through the cover 3. ing.
　さらに、密閉ハウジング２の下方部には、冷凍サイクル側からリターンする低圧の冷媒ガスを、アキュームレータ（図示省略）を介して圧縮機構６に吸入させる吸入配管９が接続される。密閉ハウジング２の上部には、カバー３を貫通するように吐出配管１０が設けられ、圧縮機構６により圧縮された高温高圧の冷媒ガスが外部（冷凍サイクル）に吐出可能とされている。 Furthermore, a suction pipe 9 is connected to the lower part of the closed housing 2 for drawing the low pressure refrigerant gas returned from the refrigeration cycle side into the compression mechanism 6 via an accumulator (not shown). A discharge pipe 10 is provided in the upper part of the closed housing 2 so as to penetrate the cover 3, and the high-temperature and high-pressure refrigerant gas compressed by the compression mechanism 6 can be discharged to the outside (refrigerating cycle).
　電動モータ５は、ステータ（固定子）１１とロータ（回転子）１２とから構成され、ステータ１１が密閉ハウジング２の内周面に焼嵌めもしくは圧入されることによって固定設置されている。ロータ１２には、駆動軸１３が一体に結合され、その回転駆動力が駆動軸１３を介して圧縮機構６に伝達可能とされている。駆動軸１３の下方部位には、圧縮機構６のローリングピストン１９の設置位置に対応して偏心部１４が設けられている。 The electric motor 5 is composed of a stator (stator) 11 and a rotor (rotor) 12, and the stator 11 is fixedly installed by shrink fitting or press-fitting on the inner peripheral surface of the sealed housing 2. The drive shaft 13 is integrally coupled to the rotor 12, and the rotational drive force can be transmitted to the compression mechanism 6 via the drive shaft 13. An eccentric portion 14 is provided at a lower portion of the drive shaft 13 in correspondence with the installation position of the rolling piston 19 of the compression mechanism 6.
　圧縮機構（ロータリ圧縮機構）６は、シリンダ室１６を形成し、駆動軸１３の偏心部１４に対応する位置で密閉ハウジング２内に固定設置されたシリンダ本体１５と、シリンダ本体１５の上面および下面に固定設置され、シリンダ室１６を区画するとともに、駆動軸１３を回転自在に支持する上部軸受１７および下部軸受１８と、駆動軸１３の偏心部１４に回動自在に嵌合され、シリンダ室１６内を回動するローリングピストンと、シリンダ本体１５に設けられている溝（図示省略）に摺動自在に嵌合され、シリンダ室１６内を吸入側と吐出側とに仕切るベーン（図示省略）等々を備えた構成とされている。かかる構成の圧縮機構６は、よく知られたものである。 The compression mechanism (rotary compression mechanism) 6 forms a cylinder chamber 16, and a cylinder body 15 fixedly installed in the sealed housing 2 at a position corresponding to the eccentric portion 14 of the drive shaft 13, and upper and lower surfaces of the cylinder body 15 And the upper bearing 17 and the lower bearing 18 which rotatably support the drive shaft 13, and the eccentric portion 14 of the drive shaft 13 are rotatably fitted to the cylinder chamber 16. A rolling piston that rotates inside, a groove (not shown) slidably fitted in a groove (not shown) provided in the cylinder main body 15, and a vane (not shown) etc. that divides the inside of the cylinder chamber 16 into a suction side and a discharge side And is configured. The compression mechanism 6 of such a configuration is well known.
　圧縮機構６のシリンダ室１６内には、吸入配管９から吸入ポート２０を経て低圧の冷媒ガスが吸入されるようになっている。この冷媒ガスは、ローリングピストン１９の回動により圧縮された後、図示省略の吐出ポート、吐出弁を通して吐出チャンバー２１内に吐出され、そこから密閉ハウジング２内に吐出されるようになっている。密閉ハウジング２内に吐出される高温高圧の冷媒ガスは、密閉ハウジング２の内周面と電動モータ５のステータ１１外周面間に設けられている冷媒通路等を経て密閉ハウジング２内の上部空間に導かれ、吐出配管１０を経て外部（冷凍サイクル側）に吐出されるようになっている。 A low pressure refrigerant gas is drawn into the cylinder chamber 16 of the compression mechanism 6 from the suction pipe 9 through the suction port 20. The refrigerant gas is compressed by the rotation of the rolling piston 19 and then discharged into the discharge chamber 21 through a discharge port and a discharge valve (not shown), and then discharged into the closed housing 2 from there. The high temperature and high pressure refrigerant gas discharged into the sealed housing 2 passes through the refrigerant passage and the like provided between the inner peripheral surface of the sealed housing 2 and the outer peripheral surface of the stator 11 of the electric motor 5 to the upper space in the sealed housing 2 It is led and discharged through the discharge pipe 10 to the outside (the refrigeration cycle side).
　駆動軸１３の下端部には、油ポンプ２２が設けられ、駆動軸１３中に設けられている給油孔２３等を介して密閉ハウジング２内の底部に充填されている潤滑油を圧縮機構６の軸受部や摺動部等の潤滑部位に給油可能とされている。
　上記密閉型電動圧縮機１にあって、電動モータ５のステータ１１は、密閉ハウジング２の内周面に焼嵌めもしくは圧入される際の圧縮応力や磁気損失（鉄損）を低減し、モータ効率を向上すべく、以下のとおり焼嵌めもしくは圧入されている。 An oil pump 22 is provided at the lower end portion of the drive shaft 13, and lubricating oil filled in the bottom portion of the sealed housing 2 via an oil supply hole 23 or the like provided in the drive shaft 13 is It is possible to supply oil to lubricating parts such as bearings and sliding parts.
In the sealed electric compressor 1, the stator 11 of the electric motor 5 reduces compression stress and magnetic loss (iron loss) at the time of shrink fitting or press fitting on the inner peripheral surface of the sealed housing 2, and motor efficiency In order to improve the following, it is shrink-fit or press-fit as follows.
　電動モータ５のステータ１１は、電磁鋼板を環状に打ち抜き成形し、それを複数枚積層して所定厚さＬの固定子鉄心１１Ａを形成し、そのティース部にコイル巻線１１Ｂを巻装したものである。ここでの固定子鉄心１１Ａは、密閉ハウジング２の内周面に焼嵌めもしくは圧入されるため、特に外形が変形形状とされることなく、円筒形状を有するものとされている。 The stator 11 of the electric motor 5 is formed by punching and forming electromagnetic steel plates in an annular shape, laminating a plurality of them to form a stator iron core 11A of a predetermined thickness L, and winding a coil winding 11B around its teeth portion It is. Since the stator core 11A here is shrink-fit or press-fit on the inner peripheral surface of the closed housing 2, the outer shape is not particularly deformed, and has a cylindrical shape.
　一方、ステータ１１の固定子鉄心１１Ａが焼嵌めもしくは圧入される密閉ハウジング２の内周面は、ステータ１１の全厚さ方向寸法Ｌの一部範囲ｈ（ｈ１）のみをハウジング内周面に焼嵌めもしくは圧入する範囲としたとき、その一部範囲ｈ（ｈ１）に対応する圧入部分２Ａの内径がＤとされ、残余の部分は、その位置に応じて焼嵌めもしくは圧入部分２Ａと同じ内径Ｄ、ステータ１１が挿入可能な内径Ｄ１（Ｄ１＞Ｄ）、もしくはそれより大きい内径Ｄ２（Ｄ２＞Ｄ１）とされている。 On the other hand, the inner peripheral surface of the sealed housing 2 to which the stator core 11A of the stator 11 is shrink-fit or press-fit is formed by burning only a partial range h (h1) of the full thickness dimension L of the stator 11 to the inner peripheral surface of the housing When fitting or pressing is performed, the inner diameter of the press-fitting portion 2A corresponding to the partial range h (h1) is D, and the remaining portion has the same inner diameter D as the shrink-fitting or press-fitting portion 2A according to its position. The inner diameter D1 (D1> D) or a larger inner diameter D2 (D2> D1) to which the stator 11 can be inserted.
　つまり、本実施形態において、密閉ハウジング２の内径は、ステータ１１の焼嵌めもしくは圧入部分２Ａの内径が、焼嵌め代もしくは圧入代を有する内径Ｄとされており、焼嵌めもしくは圧入部分２Ａよりも下方部分２Ｂの内径は、焼嵌めもしくは圧入部分２Ａと同じ内径Ｄとしてもよいことから同じ内径Ｄとされており、焼嵌めもしくは圧入部分２Ａよりも上方部分２Ｃの内径は、カバー３を溶接前の状態でステータ１１を挿入することができるように、内径Ｄ１（Ｄ１＞Ｄ）もしくはそれよりも大きい内径Ｄ２（Ｄ２＞Ｄ１）とされている。 That is, in the present embodiment, the inner diameter of the sealed housing 2 is such that the inner diameter of the shrink fit or press fit portion 2A of the stator 11 is the inner diameter D having a shrink fit margin or press fit margin, compared to the shrink fit or press fit portion 2A. The inner diameter of the lower portion 2B is the same as the inner diameter D as the shrink-fit or press-fit portion 2A, and the inner diameter D of the upper portion 2C is smaller than the shrink-fit or press-fit portion 2A before welding the cover 3 The inner diameter D1 (D1> D) or an inner diameter D2 (D2> D1) larger than the inner diameter D1 (D1> D) is set so that the stator 11 can be inserted in this state.
　これによって、ステータ１１を焼嵌めもしくは圧入する範囲ｈ（ｈ１）に対応した密閉ハウジング２側の焼嵌めもしくは圧入部分２Ａよりも上方部分２Ｃにおいて、密閉ハウジング２の内周面とステータ１１の外周面との間に、互いが非接触となる大きさの隙間Ｓが設定されるようにしている。この隙間Ｓは、電動モータ５のステータ１１側において電磁加振力による振動が発生したとしても、その振動が互いの接触により密閉ハウジング２側に伝播しない程度の大きさとされることが望ましい。 Thereby, the inner peripheral surface of the sealed housing 2 and the outer peripheral surface of the stator 11 in the upper portion 2C above the shrink fit or press fit portion 2A on the sealed housing 2 side corresponding to the range h (h1) of the stator 11 And a gap S having a size such that they are not in contact with each other is set. It is desirable that the gap S be of such a size that the vibration does not propagate to the sealed housing 2 due to contact with each other, even if vibration due to electromagnetic excitation occurs on the stator 11 side of the electric motor 5.
　さらに、ステータ１１を密閉ハウジング２内に焼嵌めもしくは圧入する範囲ｈ（ｈ１）は、電動モータ５を固定設置するために必要な保持力を確保しつつ、焼嵌めもしくは圧入による圧縮応力および磁気損失を可及的に小さくし得る範囲としなければならない。図６に示すグラフは、密閉型電動圧縮機１でのステータ１１の焼嵌めによる磁気損失およびステータ保持力と焼嵌め範囲率（ｈ（ｈ１）／Ｌ）との関係を示したものである。 Further, the range h (h1) in which the stator 11 is shrink-fit or press-fit in the sealed housing 2 secures the holding force necessary for fixing and installing the electric motor 5, while the compressive stress and magnetic loss due to the shrink-fit or press-fit Should be as small as possible. The graph shown in FIG. 6 shows the relationship between the magnetic loss and the stator holding power due to the shrink fitting of the stator 11 in the hermetic motor compressor 1 and the shrink fitting range ratio (h (h1) / L).
　このグラフに示されるように、必要最小限のステータ保持力を確保するためには、焼嵌めもしくは圧入されるステータ１１の厚さ方向範囲ｈ（ｈ１）を、ステータ１１の全厚さ方向寸法Ｌに対して、０．０５Ｌ以上とする必要がある。また、焼嵌めもしくは圧入によるステータ１１の圧縮応力および磁気損失を十分小さくするためには、焼嵌めもしくは圧入されるステータ１１の厚さ方向範囲ｈ（ｈ１）を、ステータ１１の全厚さ方向寸法Ｌに対して、０．７５Ｌ以下とする必要がある。より好ましい範囲ｈ（ｈ１）は、１／３Ｌ＜ｈ（ｈ１）＜１／２Ｌである。 As shown in this graph, in order to secure the necessary minimum stator holding force, the thickness direction range h (h1) of the stator 11 to be shrink-fitted or press-fit is set to the dimension L of the entire thickness direction of the stator 11 However, it is necessary to make it 0.05L or more. Further, in order to sufficiently reduce the compressive stress and magnetic loss of the stator 11 due to the shrink fitting or press fitting, the thickness direction range h (h1) of the stator 11 to be shrink fitted or press fitted is the dimension of the entire thickness direction of the stator 11 It is necessary to set it as 0.75 L or less to L. A more preferable range h (h1) is 1 / 3L <h (h1) <1 / 2L.
　以上の説明の構成により、本実施形態によれば、以下の作用効果を奏する。
　上記密閉型電動圧縮機１において、電動モータ５に給電され、ロータ１２が回転されることにより駆動軸１３を介して圧縮機構６が駆動されると、吸入配管９を介して低圧の冷媒ガスが圧縮機構６のシリンダ室１６内に吸入され、ローリングピストン１９の回動によって圧縮された後、図示省略の吐出ポートおよび吐出弁を介して吐出チャンバー２１内に吐出される。 According to the configuration described above, according to the present embodiment, the following effects can be obtained.
In the sealed electric compressor 1, when the compression mechanism 6 is driven through the drive shaft 13 by supplying electric power to the electric motor 5 and rotating the rotor 12, low pressure refrigerant gas is supplied through the suction pipe 9 After being drawn into the cylinder chamber 16 of the compression mechanism 6 and compressed by the rotation of the rolling piston 19, it is discharged into the discharge chamber 21 through a discharge port and a discharge valve (not shown).
　この高温高圧の圧縮ガスは、吐出チャンバー２１から密閉ハウジング２内部に吐出された後、密閉ハウジング２の内周面とステータ１１の外周面との間に形成されている冷媒通路を通して密閉ハウジング２内の上部空間に導かれ、そこから吐出配管１０を経て冷凍サイクル側に吐出される。かかる圧縮動作の間、電動モータ５は、制御された回転数で回転され、圧縮機構６を駆動し続けることになる。 The high-temperature and high-pressure compressed gas is discharged from the discharge chamber 21 into the inside of the sealed housing 2, and then, is passed through the refrigerant passage formed between the inner peripheral surface of the closed housing 2 and the outer peripheral surface of the stator 11. The air is led to the upper space of the fuel cell and discharged from there through the discharge pipe 10 to the refrigeration cycle side. During the compression operation, the electric motor 5 is rotated at a controlled rotational speed and keeps driving the compression mechanism 6.
　かかる電動モータ５は、組立てるとき、カバー３を溶接する前の状態で密閉ハウジング２内にステータ１１を挿入し、そのステータ１１の厚さ方向寸法Ｌの一部範囲である焼嵌めもしくは圧入範囲ｈ（ｈ１）を密閉ハウジング２の焼嵌めもしくは圧入部分２Ａに対して焼嵌めもしくは圧入する必要があり、その後、駆動軸１３を一体化したロータ１２を組み込むことにより、電動モータ５が密閉ハウジング２の内部に組込まれることになる。 When assembling the electric motor 5, the stator 11 is inserted into the sealed housing 2 before welding the cover 3, and a shrink fit or press-fit range h which is a partial range of the thickness direction dimension L of the stator 11 (H1) needs to be shrink-fit or press-fit to the shrink-fit or press-fit portion 2A of the sealed housing 2, and thereafter, the electric motor 5 is integrated in the closed housing 2 by incorporating the rotor 12 integrated with the drive shaft 13. It will be incorporated inside.
　この際、電動モータ５は、ステータ１１の厚さ方向の一部範囲ｈ（ｈ１）のみが密閉ハウジング２の焼嵌めもしくは圧入部分２Ａの内周面に焼嵌めもしくは圧入され、残余の部分は、密閉ハウジング２の内径を拡径（Ｄ１又はＤ２に拡径）することにより、ハウジング内周面に対して非接触となるようにしている。つまり、ステータ１１の全厚さ方向寸法をＬとしたとき、その一部である焼嵌めもしくは圧入する範囲ｈ（ｈ１）のみを焼嵌めもしくは圧入範囲とし、「０．０５Ｌ＜ｈ（ｈ１）＜０．７５Ｌ」、好ましくは、「１／３Ｌ＜ｈ（ｈ１）＜１／２Ｌ」をその範囲に設定している。 At this time, only a partial range h (h1) of the thickness direction of the stator 11 of the electric motor 5 is shrink-fit or press-fit on the inner peripheral surface of the shrink-fit or press-fit portion 2A of the sealed housing 2 The inner diameter of the sealed housing 2 is expanded (expanded to D1 or D2) so that the inner peripheral surface of the housing is not in contact. That is, when the dimension in the entire thickness direction of the stator 11 is L, only the shrink fit or press fit range h (h1) which is a part thereof is set as the shrink fit or press fit range, “0.05L <h (h1) < The range is set to 0.75 L, preferably, “1/3 L <h (h1) <1/2 L”.
　このように、電動モータ５を密閉ハウジング２内に固定設置するために必要な最小限の保持力を確保できるように、ステータ１１の厚さ方向寸法の一部範囲ｈ（ｈ１）のみを密閉ハウジング２の内周面に対して焼嵌めもしくは圧入し、残余の部分を焼嵌めもしくは圧入せずに、ハウジング内周面に対して非接触となるように設置することにより、ステータ１１の焼嵌めもしくは圧入による圧縮応力および磁気損失（鉄損）を最小限化することができる。 As described above, only a partial range h (h1) of the thickness direction dimension of the stator 11 is sealed so that the minimum holding force necessary for fixing and installing the electric motor 5 in the sealed housing 2 can be secured. By shrink-fitting or press-fitting against the inner circumferential surface of 2 and installing the remaining portion so as not to be in contact with the inner circumferential surface of the housing without shrink-fitting or press-fitting, shrinkage-fit or Compressive stress and magnetic loss (iron loss) can be minimized.
　このため、ステータ１１の磁気性能に何ら影響を及ぼすことなく、モータ効率を改善しモータ性能を向上することができる。また、密閉ハウジング２のステータ１１の設置部位に対応する一部分のみを拡径すればよく、密閉ハウジング２、ひいては密閉型電動圧縮機１の大型化を回避することができる。更に、ステータ１１の焼嵌めもしくは圧入されない残余の部分が、密閉ハウジング２の内周面と隙間Ｓにより非接触とされているため、ステータ１１側での磁気加振力が密閉ハウジング２に伝播することによる騒音の発生をも抑制することができる。 For this reason, motor efficiency can be improved and motor performance can be improved without affecting the magnetic performance of the stator 11 at all. Further, the diameter of only a part of the hermetic housing 2 corresponding to the installation site of the stator 11 may be enlarged, and the enlargement of the hermetic housing 2 and hence the hermetic electric compressor 1 can be avoided. Furthermore, since the remaining portion of the stator 11 which is not shrink-fit or press-fit is not in contact with the inner circumferential surface of the hermetic housing 2 due to the gap S, the magnetic excitation force on the stator 11 side is propagated to the hermetic housing 2 It is also possible to suppress the generation of noise due to noise.
　しかも、ステータ１１の焼嵌めもしくは圧入範囲ｈ（ｈ１）を、ステータ１１の全厚さ方向寸法Ｌに対して、０．０５Ｌ＜ｈ（ｈ１）＜０．７５Ｌの範囲、好ましくは１／３Ｌ＜ｈ（ｈ１）＜１／２の範囲としているため、電動モータ５を固定設置するために必要な保持力を確保しながら、焼嵌めもしくは圧入によるステータ１１の圧縮応力および磁気損失を可及的に小さくすることができる。つまり、ステータ１１を焼嵌めもしくは圧入する範囲ｈ（ｈ１）を、その全厚さ方向寸法Ｌの０．０５Ｌ以上とすることにより、必要最小限のステータ保持力を確保し、焼嵌めもしくは圧入する範囲ｈ（ｈ１）を全厚さ方向寸法Ｌの０．７５Ｌ以下とすることにより、焼嵌めもしくは圧入によるステータ１１の圧縮応力および磁気損失を十分小さくすることができる。 In addition, the shrink fit or press-fit range h (h1) of the stator 11 with respect to the dimension L in the entire thickness direction of the stator 11 is in the range of 0.05L <h (h1) <0.75L, preferably 1 / 3L < Since h (h1) <1/2, the compressive stress and magnetic loss of the stator 11 by shrink fitting or press fitting are as much as possible while securing the holding force necessary for fixing and installing the electric motor 5. It can be made smaller. That is, by setting the range h (h1) in which the stator 11 is shrink-fit or press-fit to 0.05 L or more of the total thickness dimension L, the minimum necessary stator holding power is secured, and the shrink-fit or press-fit is performed. By setting the range h (h1) to be equal to or less than 0.75 L of the total thickness direction dimension L, the compressive stress and magnetic loss of the stator 11 due to shrink fitting or press fitting can be sufficiently reduced.
　このため、ステータ１１の形状を変える必要がなく、磁気性能に影響を及ぼさないようにしつつ、モータ効率を改善してモータ性能を向上することができる。
　また、焼嵌めもしくは圧入される一部範囲ｈ（ｈ１）をステータ１１の厚さ方向の一端部位のみとしているため、ステータ１１を密閉ハウジング２の焼嵌めもしくは圧入位置に挿入する際の互いの接触距離を短くすることができ、これによって、特にステータ１１の圧入による固定設置をより容易化することができる。 For this reason, it is not necessary to change the shape of the stator 11, and it is possible to improve the motor efficiency and improve the motor performance while not affecting the magnetic performance.
Further, since partial range h (h1) to be shrink fitted or press fitted is only one end portion in the thickness direction of stator 11, mutual contact when inserting stator 11 into the shrink fitted or press fitted position of sealed housing 2 The distance can be shortened, which in particular makes it possible to facilitate the fixed installation by means of press-fitting of the stator 11.
　更に、密閉ハウジング２の内周面のステータ１１の一部範囲ｈ（ｈ１）を焼嵌めもしくは圧入する部位に対応した圧入部分２Ａを、焼嵌め代もしくは圧入代を有する内径Ｄとし、他の部分２Ｂ，２Ｃを、その位置に応じて焼嵌めもしくは圧入部分２Ａの下方部分２Ｂを焼嵌めもしくは圧入部分２Ａと同じ内径Ｄ、上方部分２Ｃをステータ１１が挿入可能な内径Ｄ１もしくはそれより大きな内径Ｄ２としている。 Furthermore, the press-fit portion 2A corresponding to the portion of the inner circumferential surface of the sealed housing 2 on which the partial range h (h1) of the stator 11 is shrink-fitted or press-fitted is the inside diameter D having a shrink-fit or press-fit allowance. 2B, 2C, depending on the position, the lower part 2B of the shrink fit or press fit portion 2A has the same inner diameter D as the shrink fit or press fit part 2A, and the upper part 2C has an inner diameter D1 that the stator 11 can insert or larger D2 And
　これによって、ステータ１１の厚さ方向の一部範囲ｈ（ｈ１）を、焼嵌め代もしくは圧入代を有する内径Ｄとした密閉ハウジング２の内周面に焼嵌めもしくは圧入して固定設置することができ、密閉ハウジング２の他の部分２Ｂ，２Ｃを、その位置に応じて焼嵌めもしくは圧入部分２Ａと同じ内径Ｄ、ステータ１１を挿入可能な内径Ｄ１もしくはそれより大きい内径Ｄ２としておくことにより、カバー３を外した状態の密閉ハウジング２の上端部からステータ１１をスムーズに挿入し、焼嵌めもしくは圧入部分２Ａに対して焼嵌めもしくは圧入することができる。 By this, a partial range h (h1) in the thickness direction of the stator 11 is fixed by shrink-fitting or press-fitting on the inner peripheral surface of the sealed housing 2 having an inner diameter D having a shrink-fit or press-fit margin. Depending on the position, the other part 2B, 2C of the sealed housing 2 has the same inner diameter D as the shrink-fit or press-in part 2A and the inner diameter D1 for inserting the stator 11 or the inner diameter D2 larger than that. The stator 11 can be smoothly inserted from the upper end portion of the closed housing 2 with 3 removed, and can be shrink-fit or press-fit to the shrink-fit or press-fit portion 2A.
　このため、密閉ハウジング２の必要な部分、例えば密閉ハウジング２の焼嵌めもしくは圧入部分２Ａよりも上方部分２Ｃのみを適宜部分的に拡径することにより、密閉ハウジング２を特段大型化することなく、ステータ１１を固定設置することができ、密閉ハウジング２、ひいては密閉型電動圧縮機１の大型化を回避することができる。 For this reason, the diameter of the closed housing 2 is not particularly increased by appropriately enlarging the diameter of only the upper part 2C of the necessary part of the closed housing 2, for example, the upper part 2C than the shrink fit or press fit part 2A of the closed housing 2. The stator 11 can be fixedly installed, and the enlargement of the sealed housing 2 and hence the sealed electric compressor 1 can be avoided.
［他の実施形態］
　次に、本発明の他の実施形態について、図３ないし図５を用いて説明する。
　上記した第１実施形態では、ステータ１１の全厚さ方向寸法Ｌに対して、上端側である一端部位を焼嵌めもしくは圧入する一部範囲ｈ（ｈ１）とし、更に密閉ハウジング２の焼嵌めもしくは圧入部分２Ａの上方部分２Ｃの内径を、圧入部分２Ａの内径Ｄよりも大きい内径Ｄ１またはＤ２とすることにより、ステータ１１を密閉ハウジング２の上端部から挿入して焼嵌めもしくは圧入することができるようにした例について説明したが、以下のような実施形態（１），（２），（３）としてもよい。 [Other embodiments]
Next, another embodiment of the present invention will be described using FIGS. 3 to 5.
In the first embodiment described above, one end portion on the upper end side is set as a partial range h (h1) to be shrink-fit or press-fit with respect to the full thickness direction dimension L of the stator 11 By making the inner diameter of the upper portion 2C of the press-fit portion 2A into an inner diameter D1 or D2 larger than the inner diameter D of the press-fit portion 2A, the stator 11 can be inserted from the upper end of the sealed housing 2 and can be shrink fit or press fit. Although the example which made it this way was demonstrated, it is good also as embodiments (1), (2), and (3) as follows.
　（１）図３に示すように、ステータ１１の全厚さ方向寸法Ｌに対して、下端側である他端部位を焼嵌めもしくは圧入する一部範囲ｈ（ｈ２）とし、更に密閉ハウジング２の焼嵌めもしくは圧入部分２Ｄの内径を、焼嵌め代もしくは圧入代を有する内径Ｄとし、その焼嵌めもしくは圧入部分２Ｄよりも上方部分２Ｅの内径を、焼嵌めもしくは圧入部分２Ｄと同じ内径Ｄとしてもよいことから同じ内径Ｄ、焼嵌めもしくは圧入部分２Ｄよりも下方部分２Ｆの内径を、カバー４を溶接する前にステータ１１を容易に挿入し、電動モータ５および圧縮機構６を組込みできるように、内径Ｄ１（Ｄ１＞Ｄ）もしくはそれよりも大きい内径Ｄ２（Ｄ２＞Ｄ１）とした構成としている。 (1) As shown in FIG. 3, with respect to the full thickness direction dimension L of the stator 11, the other end portion on the lower end side is set as a partial range h (h 2) for shrink fitting or press fitting; The inner diameter of the shrink fit or press fit portion 2D is an inner diameter D having a shrink fit margin or a press fit margin, and the inner diameter of the upper portion 2E is the same inner diameter D as the shrink fit or press fit portion 2D than the shrink fit or press fit portion 2D. The same inner diameter D, the inner diameter of the lower portion 2F than the shrink fit or press fit portion 2D, so that the stator 11 can be easily inserted before welding the cover 4 so that the electric motor 5 and the compression mechanism 6 can be assembled, The inner diameter D1 (D1> D) or an inner diameter D2 larger than that (D2> D1) is adopted.
　かかる構成とすることによっても、上記した第１実施形態と同様の効果を得ることができる。この場合、密閉ハウジング２の下半部のみを、ステータ１１の外周との間に隙間Ｓが設定され、互いに非接触となるように拡径すればよく、ステータ１１を密閉ハウジング２の下端部側から挿入して焼嵌めもしくは圧入すればよい。 With this configuration as well, the same effects as those of the first embodiment described above can be obtained. In this case, only the lower half of the sealed housing 2 may have a gap S between the outer periphery of the stator 11 and the diameter may be increased so as not to contact each other. , And may be shrink-fit or press-fit.
　（２）図４に示すように、ステータ１１の全厚さ方向寸法Ｌに対して、上下の両端部位を焼嵌めもしくは圧入する一部範囲ｈ３，ｈ４（ｈ３＋ｈ４＝ｈ）とし、更に密閉ハウジング２の焼嵌めもしくは圧入部分２Ｇ，２Ｈの内径を、焼嵌め代もしくは圧入代を有する内径Ｄとし、焼嵌めもしくは圧入部分２Ｇ，２Ｈよりも上方部分２Ｉおよび下方部分２Ｊのいずれか一方の内径を、焼嵌めもしくは圧入部分２Ｇ，２Ｈと同じ内径Ｄとしてもよいことから同じ内径Ｄもしくはそれよりも大きい内径Ｄ１（Ｄ１＞Ｄ）又はＤ１よりも大きい内径Ｄ２（Ｄ２＞Ｄ１）とし、他方の内径を、カバー３，４を溶接する前にステータ１１を容易に挿入可能な内径Ｄ１（Ｄ１＞Ｄ）もしくはそれよりも大きい内径Ｄ２（Ｄ２＞Ｄ１）としている。また、圧入部分２Ｇ，２Ｈの中間部分２Ｋの内径を、内径Ｄ１（Ｄ１＞Ｄ）もしくはそれよりも大きい内径Ｄ２（Ｄ２＞Ｄ１）とすることによって、ステータ１１の外周との間に隙間Ｓを設定した構成としている。 (2) As shown in FIG. 4, the upper and lower end portions of the entire thickness direction dimension L of the stator 11 are set to partial ranges h3 and h4 (h3 + h4 = h) in which shrinkage fitting or press fitting is performed. The inner diameter of the shrink-fit or press- fit portion 2G or 2H is an inner diameter D having a shrink-fit or press-fit allowance, and the inner diameter of any one of the upper portion 2I and the lower portion 2J than the shrink-fit or press- fit portion 2G or 2H is Since the same inner diameter D may be used as the shrink-fit or press- fit portions 2G and 2H, the same inner diameter D or an inner diameter D1 larger than that (D1> D) or an inner diameter D2 larger than D1 (D2> D1), and the other inner diameter The inner diameter D1 (D1> D) or a larger inner diameter D2 (D2> D1) to which the stator 11 can be easily inserted before welding the covers 3 and 4 is used. Further, by setting the inner diameter of the middle portion 2K of the press- fit portions 2G and 2H to the inner diameter D1 (D1> D) or an inner diameter D2 larger than that (D2> D1), the gap S is made between the outer periphery of the stator 11 It is set as the set up.
　このような構成とすることによっても、上記第１実施形態と同様の効果を得ることができる。この場合、ステータ１１の全厚さ方向寸法Ｌにおいて、複数箇所に分けて設定した焼嵌めもしくは圧入する一部範囲ｈ３，ｈ４による合計の保持力が、電動モータ５を密閉ハウジング２に対して固定設置するために必要な最小限の保持力を確保し得るようにすればよい。 With such a configuration, the same effect as that of the first embodiment can be obtained. In this case, in the entire thickness direction dimension L of the stator 11, the total holding power due to the partial ranges h3 and h4 in which shrinkage fitting or press fitting is set separately in plural places fixes the electric motor 5 to the sealed housing 2 It should be possible to ensure the minimum holding power necessary for installation.
　（３）図５に示すように、ステータ１１の全厚さ方向寸法Ｌに対して、両端部を除く中央部位を焼嵌めもしくは圧入する一部範囲ｈ（ｈ５）とし、更に密閉ハウジング２の焼嵌めもしくは圧入部分２Ｌの内径を、焼嵌め代もしくは圧入代を有する内径Ｄとし、その焼嵌めもしくは圧入部分２Ｌよりも上方部分２Ｍおよび下方部分２Ｎの内径を、ステータ１１を容易に挿入できるように、内径Ｄ１（Ｄ１＞Ｄ）もしくはそれよりも大きい内径Ｄ２（Ｄ２＞Ｄ１）とすることにより、ステータ１１の外周との間に隙間Ｓを設定した構成としている。 (3) As shown in FIG. 5, with respect to the dimension L in the full thickness direction of the stator 11, the central region excluding both end portions is set as a partial range h (h5) for shrink fitting or press fitting; The inner diameter of the fitting or press-in portion 2L is an inner diameter D having a shrink-fitting or press-in allowance, and the inner diameters of the upper portion 2M and the lower portion 2N are easier to insert the stator 11 than the shrink-fitting or press-in portion 2L. By setting the inner diameter D1 (D1> D) or an inner diameter D2 (D2> D1) larger than the inner diameter D1 (D1> D), the gap S is set between the outer periphery of the stator 11 and the inner periphery D1.
　上記の如く構成とすることによっても、上記第１実施形態と同様の効果を得ることができる。但し、この場合、ステータ１１の一部範囲ｈ（ｈ５）を除く残余の部分に対応する密閉ハウジング２の上方部分２Ｍおよび下方部分２Ｎの内径をＤ２とし、その他の部分の内径をＤ１としてもよい。 The same effects as those of the first embodiment can be obtained by adopting the configuration as described above. However, in this case, the inner diameter of the upper portion 2M and the lower portion 2N of the sealed housing 2 corresponding to the remaining portion excluding the partial range h (h5) of the stator 11 may be D2, and the inner diameter of the other portions may be D1. .
　更に、上記した第１実施形態および他の実施形態（１），（２），（３）の如く、ステータ１１の密閉ハウジング２の内周面に焼嵌めもしくは圧入される厚さ方向範囲ｈ（ｈ１ないしｈ５）を、ステータ１１の厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとすることにより、ステータ１１の焼嵌めもしくは圧入される厚さ方向範囲ｈ（ｈ１ないしｈ５）を、ステータ１１の厚さ方向の一端部位、他端部位、両端部位または中央部位のいずれかにおいて設定すればよく、密閉ハウジング２の拡径加工やステータ１１を密閉ハウジング２の焼嵌め位置や圧入位置に挿入する際の接触距離等を考慮した最適位置に設定することが可能となる。 Furthermore, as in the first embodiment and the other embodiments (1), (2), and (3) described above, the thickness direction range h (sintered or press-fit into the inner peripheral surface of the sealed housing 2 of the stator 11) The thickness direction range h (h1 to h5) in which the stator 11 is shrink-fitted or press-fitd by setting h1 to h5) to one of the one end portion, the other end portion, both end portions and the center portion in the thickness direction of the stator 11. ) May be set at any one of the one end portion, the other end portion, both end portions or the central portion in the thickness direction of the stator 11, and diameter expansion processing of the sealed housing 2 or shrink fitting position of the stator 11 or It becomes possible to set to the optimal position which considered the contact distance etc. at the time of inserting in a press-fit position.
　その結果、ステータ１１を焼嵌めもしくは圧入する厚さ方向範囲ｈ（ｈ１ないしｈ５）の設定に自由度を持たせることができ、密閉ハウジング２の外形形状やステータ１１の固定構造の決定に際し、選択の自由度を確保することができる。また、焼嵌めもしくは圧入される範囲ｈ（ｈ１ないしｈ５）をステータ１１の厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとすることにより、密閉ハウジング２の焼嵌めもしくは圧入位置に挿入する際の互いの接触距離を短くすることができ、特に圧入をより容易化することができる。 As a result, the setting of the thickness direction range h (h1 to h5) in which the stator 11 is shrink-fitted or press-fit can be given freedom, and it is selected when determining the outer shape of the sealed housing 2 and the fixing structure of the stator 11. The degree of freedom can be secured. In addition, the shrink-fit or press-fit range h (h1 to h5) is any one of the one end portion, the other end portion, both end portions, and the center portion in the thickness direction of the stator 11, the shrink fit or press-fit of the sealed housing 2 The distance of contact with one another upon insertion into the position can be reduced and in particular the press-in can be made easier.
　なお、本発明は、上記実施形態にかかる発明に限定されるものではなく、その要旨を逸脱しない範囲において、適宜変形が可能である。例えば、上記実施形態では、密閉型電動圧縮機１の一例として、単気筒のロータリ式の密閉型電動圧縮機１に適用した例について説明したが、これに限定されるものではなく、多気筒ロータリ式密閉型電動圧縮機あるいは密閉ハウジング２内に電動モータ５が固定設置されている密閉型の様々な他形式の密閉型電動圧縮機、例えばスクロール式密閉型電動圧縮機や密閉ハウジング２内に電動モータ５で駆動される複数台の圧縮機構を内蔵した多段圧縮機等に対しても幅広く適用できることは云うまでもない。 The present invention is not limited to the invention according to the above-described embodiment, and appropriate modifications can be made without departing from the scope of the invention. For example, although the above-mentioned embodiment explained an example applied to a single cylinder rotary type closed type electric compressor 1 as an example of the closed type electric compressor 1, it is not limited to this but a multi-cylinder rotary A variety of other enclosed electric compressors of the enclosed type in which the electric motor 5 is fixedly installed in the enclosed electric compressor or the enclosed housing 2, for example, the scroll type enclosed electric compressor or the electric It goes without saying that the present invention can be widely applied to a multistage compressor or the like incorporating a plurality of compression mechanisms driven by the motor 5.
１　密閉型電動圧縮機
２　密閉ハウジング
２Ａ，２Ｄ，２Ｇ，２Ｈ，２Ｌ　ステータが焼嵌めもしくは圧入される部分
２Ｂ，２Ｃ，２Ｅ，２Ｆ，２Ｉ，２Ｊ，２Ｋ，２Ｍ，２Ｎ　他の部分
５　電動モータ
６　圧縮機構
１１　ステータ
１３　駆動軸
ｈ（ｈ１，h２，ｈ３，ｈ４，ｈ５）　ステータを焼嵌めもしくは圧入する厚さ方向範囲
Ｌ　ステータの全厚さ方向寸法 DESCRIPTION OF SYMBOLS 1 Sealed-type electric compressor 2 Sealed housing 2A, 2D, 2G, 2H, 2L The part 2B, 2C, 2E, 2F, 2I, 2J, 2K, 2M, 2N to which a stator is shrink-fit or press-fit other part 5 Electric motor 6 Compression Mechanism 11 Stator 13 Drive shaft h (h1, h2, h3, h4, h5) Thickness direction range L for shrink fitting or press fitting the stator Full thickness direction dimension of the stator

Claims (4)

  1. 　円筒状の密閉ハウジングと、
    　前記密閉ハウジング内に固定設置された圧縮機構と、
    　前記密閉ハウジング内に焼嵌めもしくは圧入により固定設置され、駆動軸を介して前記圧縮機構を駆動する電動モータと、を備え、
    　前記電動モータは、そのステータの厚さ方向の一部範囲ｈのみが前記密閉ハウジングの内周面に焼嵌めもしくは圧入されることにより固定設置され、残余の部分は前記密閉ハウジングの内径を拡径することによりハウジング内周面に対して非接触とされている密閉型電動圧縮機。     A cylindrical sealed housing,
    A compression mechanism fixedly installed in the sealed housing;
    An electric motor fixedly installed in the sealed housing by shrink fitting or press fitting and driving the compression mechanism via a drive shaft;
    The electric motor is fixedly installed by shrink-fitting or press-fitting only a partial range h of the stator in the thickness direction on the inner peripheral surface of the closed housing, and the remaining part enlarges the inner diameter of the closed housing A sealed electric compressor that does not make contact with the inner circumferential surface of the housing.
  2. 　前記密閉ハウジングの内周面に焼嵌めもしくは圧入される前記ステータの厚さ方向範囲ｈは、その全厚さ方向寸法Ｌに対して０．０５Ｌ～０．７５Ｌの範囲とされている請求項１に記載の密閉型電動圧縮機。 The thickness direction range h of the stator, which is shrink-fitted or press-fitted into the inner peripheral surface of the sealed housing, is set to a range of 0.05 L to 0.75 L with respect to the total thickness direction dimension L. Sealed electric compressor as described in.
  3. 　前記ステータの前記密閉ハウジングの内周面に焼嵌めもしくは圧入される厚さ方向範囲ｈは、前記ステータの厚さ方向の一端部位、他端部位、両端部位、中央部位のいずれかとされている請求項１または２に記載の密閉型電動圧縮機。 The thickness direction range h to be shrink-fit or press-fit to the inner peripheral surface of the sealed housing of the stator is either one end portion in the thickness direction of the stator, the other end portion, both end portions, or central portion. The sealed electric compressor according to claim 1 or 2.
  4. 　前記密閉ハウジングの内周面は、少なくとも前記ステータの一部範囲ｈが焼嵌めもしくは圧入される部位に対応した部分が、焼嵌め代もしくは圧入代を有する内径Ｄとされ、他の部分は、その位置に応じて焼嵌めもしくは圧入部分と同じ内径Ｄ、前記ステータが挿入可能な内径Ｄ１、もしくはそれより大きい内径Ｄ２とされている請求項１ないし３のいずれかに記載の密閉型電動圧縮機。 The inner peripheral surface of the sealed housing has an inner diameter D having a shrink fit margin or press fit margin at least at a portion corresponding to a portion where the partial region h of the stator is shrink fit or press fit, and the other portion The sealed electric compressor according to any one of claims 1 to 3, wherein the inner diameter D is the same as the shrink fit or press-in portion depending on the position, the inner diameter D1 where the stator can be inserted, or the inner diameter D2 larger than that.
PCT/JP2016/074591 2015-09-17 2016-08-24 Hermetic electric compressor WO2017047338A1 (en)

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