Embodiment
With reference to suitable drawing, embodiments of the present invention are elaborated.In addition, part common in each figure is adopted to identical Reference numeral, the repetitive description thereof will be omitted.
(embodiment 1)
Overall structure with reference to Fig. 1~Fig. 6 to the compressor 1 in present embodiment, action, function etc. describe.
Fig. 1 is the sketch of the air conditioner of cooling and warming dual-purpose.The use in refrigeration system pipe arrangement of present embodiment connects compressor 1, outdoor heat converter 34, expansion member 35, indoor heat converter 36, and cold-producing medium is circulated.
The in the situation that of refrigerating operaton, the gas refrigerant of the HTHP being compressed by compressor 1 flows to outdoor heat converter 34 via cross valve 33.It is cooling that the gas refrigerant of HTHP is played the outdoor heat converter 34 of condenser effect, becomes the liquid refrigerant of high pressure.The liquid refrigerant of high pressure expands in expansion member 35, becomes the liquid refrigerant of the low-temp low-pressure that contains slightly gas, flows to indoor heat converter 36.The indoor heat converter 36 that the liquid refrigerant of low-temp low-pressure is played evaporator effect heats, and becomes the gas refrigerant of low temperature, again returns to compressor 1 via cross valve 33.The in the situation that of heating operation, change flowing of cold-producing medium by cross valve 33, cold-producing medium flows towards the direction contrary with refrigerating operaton.
Fig. 2 is the longitudinal section of compressor.Compressor 1 as refrigerating air-conditioning (for example, air conditioner, refrigerating box, household freezer, refrigerating sales counter etc.), the constitution equipment of the freeze cycle such as heat-pump-type hot-water supply, be mainly provided with closed container, compression element 2 and motor 7 as inscape.The compressor 1 of present embodiment is sealed electrical compressor.
The closed container of compressor 1 is made up of the cylinder 1a of portion cylindraceous, the upper and lower cap 1b and the bottom 1c that are welded on a 1a of portion, and inside is confined space.Compressor 1 is received compression element 2 and motor 7, accumulates the lubricating oil 8 being made up of ethers or ester class refrigerator oil in the oil sump 9 of bottom.The pasta of lubricating oil 8 is positioned at the top of supplementary bearing 15.
In compressor 1, be provided with the suction pipe 11 of the cap 1b that connects closed container, and connect the discharge pipe 22 of the 1a of cylinder portion of closed container.Discharge pipe 22 be positioned at framework 5 under, the center position in the closed container of compressor 1 arranges highlightedly.The front end of discharge pipe 22 is projected into central side opening from the outer peripheral face of terminal winding 17.
Compression element 2 compresses gas refrigerant and discharges in closed container, is arranged on the top in closed container.Compression element 2 as main composition key element be provided with fixed scroll 3, the scrollwork 4 that spirals, framework 5 and Euclidean circle (Japanese: オ Le ダ system リ Application グ) 10.
Fixed scroll 3 erects the scroll (Japanese: ラ ッ プ) of scroll and forms on end plate, is fixed by bolts on framework 5.At the circumference of fixed scroll 3, suction inlet 12 is set, is provided with outlet 14 at central portion.Suction inlet 12 is communicated with suction pipe 11, and outlet 14 is communicated with the space of the top of the compression element 2 in closed container.
The scrollwork 4 that spirals erects the scroll of scroll and forms on end plate, and the scrollwork 4 that spirals is clipped between fixed scroll 3 and framework 5.The scrollwork 4 that spirals engages with fixed scroll 3 and forms discharge chambe.Be provided with group enter the to spiral boss portion of bearing at the scrollwork 4 that spirals with fixed scroll opposition side.At the chimeric 6a of cam pin portion that is used for the scrollwork 4 that spirals to carry out eccentric drive on bearing that spirals.
Euclidean circle 10 forms the rotation limiting member of the scrollwork 4 that spirals, and is arranged on and spirals between scrollwork 4 and framework 5, prevent from spiraling scrollwork 4 oneself then it is moved along circuit orbit.
Framework 5 is weldingly fixed on closed container, and fixed scroll 3, Euclidean circle 10 and the scrollwork 4 that spirals are supported.The central authorities of framework 5 be provided with towards below outstanding cylinder portion.In this portion, be provided with axle 6 is carried out to the base bearing 5a that axle props up.
At the peripheral part of fixed scroll 3 and framework 5, be formed with multiple Exhaust Gas paths that the superjacent air space of fixed scroll 3 is communicated with the lower side space of framework 5.
Motor 7 is provided with rotor 7a, stator 7b, axle 6 and counterweight 16 as main composition key element.
Stator 7b is provided with as main composition key element: there is current flowing and produce multiple conductors of rotating magnetic field winding 24, be used for efficiency and transmit well the iron core 23 of rotating magnetic field, and the insulator 26 being used for to the synthetic resin insulating between winding 24 and iron core 23.The winding 24 of stator 7b is reeled by concentrated winding method.
Iron core 23 is fixed on closed container by shrink fit.Periphery at this stator 7b forms multiple breach along complete cycle, is formed with Exhaust Gas path between this breach and closed container.
Rotor 7a as main composition key element be provided with rotor core 25 and in be contained in the permanent magnet in rotor core 25, be rotated centered by axle 6 being transformed into gyration from the rotating magnetic field of stator 7b.Rotor 7a is configured in the medium pore of iron core 23 of stator 7b in revolvable mode.
The medium pore of axle 6 and rotor 7a is chimeric and form one with rotor 7a.One side of axle 6 is given prominence to and engages with compression element 2 from rotor 7a, is applied in eccentric force by the compressed action of compression element 2.In the present embodiment, axle 6 two side-prominent from rotor 7a of both sides, the both sides of rotor 7a are propped up by base bearing 5a and supplementary bearing 15 axles, can stably be rotated.Supplementary bearing 15 is fixed by welding in the supporting units support on the closed container of compressor 1, and, be immersed in lubricating oil 8.
The lower end of axle 6 extends in the oil sump 9 of bottom of the closed container of compressor 1.Be provided with the through hole 6b that lubricating oil 8 is supplied with towards each bearing portion and each sliding surface at axle 6, draw lubricating oil 8 from the oil sump 9 of bottom by through hole 6b.Be drawn onto lubricating oil 8 compression element 2 and be fed into the sliding part of each bearing and compression element 2 by axle through hole 6b from oil sump 9.The lubricating oil 8 of sliding part that is fed into compression element 2 outlet 14 from the central portion of fixed scroll 3 together with refrigerant gas is discharged.
Counterweight 16 by the counterweight of compression element 2 sides that is arranged on rotor 7a (hereinafter referred to as " upper counterweight ".) 16a and the lower counterweight that is arranged on the opposition side of the compression element 2 of rotor 7a be (hereinafter referred to as " lower counterweight ".) 16b formation, be fixed on rotor 7a by multiple rivets.
When stage motor 7 is switched on rotor 7a rotation, axle 6 also thereupon rotation, carry out the 6a of cam pin portion bias gyration, thus, the scrollwork 4 that spirals is rotated to driving, is formed on fixed scroll 3 and the discharge chambe between scrollwork 4 of spiraling moves from outer circumferential side towards central portion on one side and diminishes on one side.Thus, the compressed member 2 of refrigerant gas being inhaled into via suction pipe 11 and suction inlet 12 from the outside of the closed container of compressor 1 compresses, and the refrigerant gas having compressed is discharged to the upper space in the closed container of compressor 1 from the outlet 14 of the central portion of fixed scroll 3.
Stator 7b has stator core 23, the insulator 26 that configures in opposite directions with the axial both ends of the surface of stator core 23 respectively, with together be wound on the winding 24 on stator core 23 and insulator 26.
Fig. 3 is the stereogram of stator core.As shown in Figure 3, stator core 23 is made up of stacked multiple steel plates, has stator core annulus 27, and outstanding also along the T shape portion 28 of circumferentially arranging by equal intervals towards radially inner side from the inner peripheral surface of stator core annulus 27.
Motor 7 is so-called 4 utmost point 6 slotted, adopts not across multiple T shape portion 28 but around intensively the reel so-called concentrated winding method of winding 24 of 1 T shape portion 28.
Fig. 4 is the upward view of insulator, the stereogram that Fig. 5 is insulator.Insulator 26 is clamped between stator core 23 and winding 24, and stator core 23 and winding 24 are insulated.Insulator 26, for example, be made up of the good resin material of the thermal endurances such as liquid crystal polymer (LCP), polybutene terephthalic acid (TPA) (PBT), polyhenylene thioether (PPS), polyimides, polyester.For example, and insulator 26,, is made up of the material that has added glass fibre in order to improve intensity.
In addition, the dielectric constant of liquid crystal polymer (LCP) is 3.6, the dielectric constant of polybutene terephthalic acid (TPA) (PBT) is 3.1~3.3, the dielectric constant of polyhenylene thioether (PPS) is 2.8.
As shown in Figures 4 and 5, insulator 26 has insulator annulus 29, and outstanding also along circumferentially pressing multiple bodies 30 of uniformly-spaced arranging towards radially inner side from the inner peripheral surface of insulator annulus 29.
The insulator annulus 29 of insulator 26 is configured to join with the both ends of the surface of the stator core annulus 27 of stator core 23, and multiple bodies 30 of insulator 26 are configured to join with the both ends of the surface of the multiple T shape portion 28 of stator core 23.In other words, stator core 23 is clamped from bearing direction by 2 insulators 26.
The face that insulator annulus 29 and stator core 23 join, its circumferential both ends of the surface are not carried out chamfering.With the face of stator core 23 opposition sides, chamfering is carried out at its circumferential two ends.
The electromagnetic force that compressor 1 occurs in stator 7b by streaming current in winding 24, drives rotor 7a to rotate together with axle 6.And the part in winding 24 in mobile electric current divides electric current to leak towards stator core 23.
At this, in compressor 1, stator is directly fixed on the closed container of steel plate system, so, in the value (mobile leakage current is less than or equal to 1mA between the surface of charging part and device body) that must specify in electrical appliance administrative law in order human body not to be impacted.Therefore, must take some countermeasures and make leakage current in electric current mobile in winding 24, that leak towards stator core 23 be less than or equal to 1mA.
Leakage current away from identical with the principle of electric capacity, establishing leakage current is that i, frequency are that f, spuious electrostatic capacitance are that C, voltage are V, the relation of formula (1) set up.
(mathematical expression 1)
i=2πfCV…(1)
Spuious electrostatic capacitance C between winding 24 and stator core 23 is, the distance of establishing dielectric constant between winding 24 and stator core 23 and be area between ε, winding 24 and stator core 23 and be between S, winding 24 and stator core 23 is d, and the relation of formula (2) is set up.
(mathematical expression 2)
C=εS/d…(2)
(dielectric constant of R32)
But, compare with R410A, the R32 that the substitute of the conduct time generation cold-producing medium that greenhouse effects of the earth coefficient is low is studied, its DIELECTRIC CONSTANT ε is high.For example, the DIELECTRIC CONSTANT ε of the R410A at 40 DEG C is 7.7045, and to this, the DIELECTRIC CONSTANT ε of the R32 at 40 DEG C is 11.268.
That is to say, in the situation that R32 is used as to cold-producing medium, the spuious electrostatic capacitance C based on formula (2) becomes large.So the leakage current i based on formula (1) may exceed the value specifying in electrical appliance administrative law.
By clip insulating material 32 between winding 24 and stator core 23, thereby can reduce leakage current i.But in the situation that R32 is used as to cold-producing medium, the insulating material 32 generally using now cannot ensure that leakage current i is less than or equal to the value specifying in electrical appliance administrative law.The thickness of the insulating material 32 generally using is now 3mm to the maximum, and when Thickness Ratio 3mm thick, or during overlapping insulating material 32 2 uses, cost uprises, assembleability variation.
Fig. 6 is the sectional view upwards of week of the T shape portion of stator core and the body of insulator.Winding 24 is wound on the T shape portion 28 of stator core 23 and the body 30 of insulator 26 by reel winder.
In the past, winding 24 was closely connected with the T shape portion 28 of stator core 23.On the other hand, in the present embodiment, as shown in Figure 6, make the circumferential width of body 30 of insulator 26 larger than the circumferential width of the T shape portion 28 of stator core 23.By the winding 24 of reeling on the stator core 23 such and insulator 26, can make winding 24 not contact with stator core 23, can between stator core 23 and winding 24, gap 31 be set.
According to present embodiment, guarantee the distance d between winding 24 and stator core 23 by gap 31, thereby, can reduce the spuious electrostatic capacitance C based on formula (2), and make to be less than or equal to based on the leakage current i of formula (1) value specifying in electrical appliance administrative law.
In addition, the T shape portion 28 of stator core 23 and axial (the gyroaxis direction of axle 6) of the body 30 of insulator 26 from stator core 23, be roughly the same shape beyond circumferential width.But, in order to prevent the deteriorated of winding 24, make the T shape portion 28 from stator core 23 in the body 30 of insulator 26 towards the part of circumferentially stretching out for oval.
And, in gap 31, accumulate R32 and refrigerator oil.By dielectric constant is configured in to the part in gap 31 than R32 and the low insulating material 32 of refrigerator oil, can reduce the mean value of the DIELECTRIC CONSTANT ε in gap 31, can further reduce leakage current i.
And, except the circumferential width of the body 30 that makes insulator 26 is greater than the circumferential width of T shape portion 28 of stator core 23, can also between winding 24 and stator core 23, configure insulating material 32.
And except the circumferential width of the body 30 that makes insulator 26 is greater than the circumferential width of T shape portion 28 of stator core 23, the inner peripheral surface that can also make insulator annulus 29 is further interior side-prominent towards radially than the inner peripheral surface of stator core annulus 27.
As described above, according to present embodiment, strengthen the distance between winding 24 and stator core 23, can obtain the effect that reduces spuious electrostatic capacitance C, reduces leakage current.
(embodiment 2)
For inscape that present embodiment is identical with the 1st execution mode, the description thereof will be omitted.Fig. 7 is the key diagram of the return portion at the two ends of insulating material.Fig. 8 is the sectional view upwards of week of the T shape portion of stator core and the body of insulator.
As shown in Figure 7, the insulating material 32 of present embodiment, the return portion 32a having turned back in the two ends with bearing direction.That is to say, at the two ends of the bearing direction of stator core 23, insulating material 32 turn back and overlapping state under be configured in stator core 23 and winding 24 radially between.
The insulating material 32 of present embodiment is 1, but the return portion 32a that is insulated material 32 due to winding 24 supports, therefore, even be 2 times of thickness of insulating material 32 also making distance d between winding 24 and stator core 23 near central authorities.
According to present embodiment, as shown in Figure 8, except configuration insulating material 32 between winding 24 and stator core 23, can also between stator core 23 and insulating material 32, gap 31 be set.Therefore, by insulating material 32 is turned back and guaranteed the distance d between winding 24 and stator core 23, thereby can reduce the spuious electrostatic capacitance c based on formula (2), reduce the leakage current i based on formula (1).
In addition, in the present embodiment, as shown in Figure 8, more lean on stator core 23 sides although the return portion 32a of insulating material 32 is positioned at than winding 24, also can make the return portion 32a of insulating material 32 be positioned at winding 24 sides.
But in the case of the return portion 32a of insulating material 32 is positioned at winding 24 sides, near central authorities, gap 31 is positioned between winding 24 and insulating material 32.Owing to can accumulating cold-producing medium in gap 31 during this time, so easily from winding 24 towards refrigrant leakage electric current.
On the other hand, in the case of the return portion 32a of insulating material 32 is positioned at stator core 23 sides, as shown in Figure 8, gap 31 is positioned between secured core 23 and insulating material 32.That is, gap 31 joins via insulating material 32 and winding 24, so, can reduce from winding 24 towards the current leakage that is accumulated in the cold-producing medium gap 31.
And, at the two ends of the bearing direction of stator core 23, can guarantee the distance d between winding 24 and stator core 23 by the circumferential thickness of thickening stator core 23.
As described above, according to compressor of the present invention, can strengthen the distance between winding 24 and stator core 23, obtain the effect that reduces spuious electrostatic capacitance C, reduces leakage current.
The invention is not restricted to above-described embodiment, comprise various modified examples.For example, above-described embodiment is the embodiment that intelligibly the present invention is described and be described in detail in order to hold, and needn't possess illustrated whole inscapes.And, the inscape of a part for the inscape of certain embodiment and another embodiment can be replaced, and, the inscape of certain embodiment can be added in the inscape of other embodiment.And, also can append, eliminate, replace other inscape to a part for the inscape of each embodiment.
For example, as compression element 2, except spiral-wound, can also adopt rotator type, swing type or compression element in the form of piston.
And, although to adopting the situation of R32 to be illustrated as cold-producing medium, be not limited to this.For example, as cold-producing medium, also can adopt the mix refrigerant that contains the R32 that exceedes 50 % by weight, maybe need to take other cold-producing medium of leakage current countermeasure.
Description of reference numerals
1 closed container
7 motor
7a rotor
7b stator
8 lubricating oil
9 oil sumps
23 stator cores
25 rotor cores
24 windings
26 insulators
27 stator core annulus
28T shape portion
29 insulator annulus
30 bodies
31 gaps
32 insulating material
32a return portion
33 cross valves
34 outdoor heat converters
35 expansion member
36 indoor heat converters