JP2008038693A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of noise caused by electromagnetic vibration of a stator of an electric element. <P>SOLUTION: This compressor has a compressor body 104 comprising the electric element 110 and a compression element 120 driven by the electric element 110 stored in a hermetic vessel 101, is provided with a block 128 having a plurality of leg parts 176 on the compression element 120, and fixes or joins an outer diameter part of the stator 112 of the electric element 110 and the leg part 176 of the block 128. Since stiffness of the stator can be improved by retaining an outer diameter part of the stator 112 by the leg parts 176 of a block 128, noise is reduced by reducing generation of electromagnetic vibration of an iron core of the stator 112 to materialize miniaturization and weight reduction of the compressor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic compressor mainly used in an electric refrigerator-freezer for home use.

  In recent years, demands for the global environment have been increasing, and in particular, high efficiency and low noise have been strongly demanded in refrigerators and other refrigeration cycle apparatuses.

  Conventionally, as this type of hermetic compressor, there is one using a DC brushless motor using a permanent magnet (see, for example, Patent Document 1). Moreover, there exists what fixed the stator of the electric motor with shrink fitting to the cylindrical pipe of the compression mechanism part (for example, refer patent document 2).

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 9 is a longitudinal sectional view of the front of a conventional hermetic compressor described in Patent Document 1, and FIG. 10 is a longitudinal sectional view of a side of the conventional hermetic compressor. FIG. 11 is a plan sectional view of a conventional electric element.

  9, 10, and 11, oil 2 is stored at the bottom of the sealed container 1, and the compressor body 4 is elastically supported by the suspension container 6 with respect to the sealed container 1.

  The compressor body 4 includes an electric element 10 composed of a stator 12 and a rotor 14, and a compression element 20 disposed above the electric element 10.

  The crankshaft 22 of the compression element 20 includes a main shaft 24 and an eccentric shaft 26. The main shaft 24 is rotatably supported by a bearing 30 of a block 28, and the rotor 14 is fixed. Further, the crankshaft 22 is provided with an oil supply mechanism 32 including a spiral groove provided on the surface of the main shaft 24.

  The piston 34 is reciprocally inserted into a cylinder 36 formed integrally with the block 28, and the cylinder 36 forms a compression chamber 40 together with the valve plate 38. When the piston 34 is attached to the piston 34, the piston pin 42 is rotatably inserted into the connecting means 44, and the eccentric shaft 26 is rotatably inserted into the connecting means 44, whereby the connecting means 44 is connected to the eccentric shaft 26 and the piston. 34 are connected. Further, the suction muffler 50 is held by the cylinder head 46 that covers the valve plate 38.

  The electric element 10 includes a stator 12 in which a winding 68 is directly wound around a plurality of magnetic pole teeth 64 of an iron core 62 in which steel plates are laminated via an insulating material 66, and a rotor 14 in which a permanent magnet 72 is built. The iron core 62 is formed by welding steel plates laminated by a welded portion 73 located on a substantially center line of the magnetic pole teeth 64 in the peripheral wall of the stator 12. The stator 12 is fastened to the leg portion 76 of the block 28 by a bolt (not shown) inserted into a through hole 74 provided in the iron core 62.

  The operation of the hermetic compressor configured as described above will be described below.

  When the electric element 10 is energized, the rotor 14 rotates together with the crankshaft 22 by the rotating magnetic field generated in the stator 12. By the rotation of the main shaft 24, the eccentric motion of the eccentric shaft 26 is transmitted to the piston 34 through the connecting means 44 and the piston pin 42, and the piston 34 reciprocates in the cylinder 36. The refrigerant gas returned from the refrigeration cycle (not shown) outside the hermetic container 1 is introduced into the compression chamber 40 via the suction muffler 50, compressed by the piston 34 in the compression chamber 40, and compressed refrigerant gas. Is sent to a refrigeration cycle (not shown) outside the sealed container 1.

  FIG. 12 is a longitudinal sectional view of a conventional hermetic compressor described in Patent Document 2.

In FIG. 12, in the compression element 20 of the compressor body 4, a cylindrical pipe member 80 is fixed to the outside of the bearing 30 by shrink fitting or welding, and the bearing 30 is sufficiently thicker than the pipe member 80. Furthermore, the stator 12 of the electric element 10 is fixed to the inner peripheral surface of the pipe member 80 by shrink fitting. When the stator 12 is assembled, a jig for making the air gap between the stator 12 and the rotor 14 uniform is not necessary.
JP 2003-83251 A Japanese Patent No. 2544658

  However, in the conventional configuration described above, noise is generated by electromagnetic vibration that deforms the iron core 62 of the stator 12 due to electromagnetic force generated in the electric element 10. In particular, in a DC brushless motor with a built-in permanent magnet, the thickness of the iron core 62 of the stator 12 can be reduced. As a result, the rigidity of the iron core 62 is reduced, so that electromagnetic vibration increases. Noise could be a problem.

  Further, even when the cylindrical pipe member 80 is provided on the outer diameter side of the stator 12, the pipe member 80 is easily deformed if the plate thickness of the pipe member 80 is made thinner than that of the bearing 30. At the same time, the pipe member 80 is also deformed, and noise may become a problem due to an increase in electromagnetic vibration. Moreover, if the rigidity of the pipe member 80 is sufficiently secured, the pipe member becomes large because of the cylindrical shape, and the compressor body becomes larger, and the weight increases.

  An object of the present invention is to solve the above-mentioned conventional problems, and to reduce the generation of electromagnetic vibration of the stator 12 with a compact configuration, to provide a hermetic compressor that is small in noise, small, and lightweight. To do.

  In order to solve the above-described conventional problems, a hermetic compressor according to the present invention stores an electric element including a rotor and a stator, and a compression element driven by the electric element in a hermetic container, and the compression element Has a crankshaft in which the rotor is fixed to a main shaft and a block in which the stator is held on a plurality of legs, and the legs hold at least the outer periphery of the stator. Since the rigidity of the stator is improved by holding the outer diameter part with the leg part of the block, noise is reduced by reducing the generation of electromagnetic vibration of the iron core, and the compressor is made smaller and lighter. be able to.

  The hermetic compressor of the present invention can provide a hermetic compressor that is small and lightweight with low noise accompanied by electromagnetic vibration of the electric element.

  According to the first aspect of the present invention, an electric element composed of a rotor and a stator and a compression element driven by the electric element are housed in a sealed container, and the compression element fixes the rotor to a main shaft. A crankshaft and a block having a plurality of legs holding the stator, the legs holding at least the outer periphery of the stator, and the outer diameter of the stator using the block legs Since the rigidity of the stator is improved by holding it compact, it is possible to reduce noise by reducing the generation of electromagnetic vibration of the iron core, and to reduce the size and weight of the compressor.

  The invention according to claim 2 is that, in the invention according to claim 1, the leg portion of the block and the outer peripheral portion of the stator are joined by welding, and a sufficient joining strength can be secured by welding. It is possible to prevent the deformation of the iron core due to the deviation of the laminated electromagnetic steel plates, and to prevent an increase in electromagnetic noise due to the deformation.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the electric element is a salient pole concentrated winding type in which a winding is directly wound around a magnetic pole tooth provided on an iron core via an insulating material. As a result, a small size and high efficiency can be obtained. On the other hand, compared to a distributed winding type motor, the slot portion is wide open, and since a strong magnetic force can be obtained with a permanent magnet, the stacking thickness is generally low, so the rigidity of the electric element is low, but the stator By holding the outer diameter portion with the leg portion of the block, the rigidity of the stator is improved, so that the compressor can be reduced in noise, small, and lightweight.

  In the invention of claim 4, in the invention of claim 2 or 3, since the welding position is on the outer diameter side of the magnetic pole teeth, the induced current generated in the weld can be reduced, and the efficiency of the electric element can be reduced. Can be high.

  The invention according to claim 5 is the invention according to any one of claims 2 to 4, wherein the number of magnetic pole teeth provided on the iron core is an integral multiple of n when the number of leg portions of the block is n. Since the positional relationship between the position of the magnetic pole teeth and the joint position of the stator and legs can be made the same, only the stator part where the strength of the iron core is weak is securely reinforced with a compact structure, and it is equally rigid Therefore, it is possible to effectively reduce the vibration of the iron core, prevent the generation of electromagnetic noise, and reduce the noise.

  The invention according to claim 6 is the invention according to any one of claims 2 to 4, wherein when the number n of the leg portions of the block is an even number, the leg portions are symmetrical with respect to the axis of the main shaft. Therefore, the vibration that deforms the stator core into an elliptical shape can be effectively reduced with a compact configuration, generation of electromagnetic noise can be prevented, and noise can be reduced.

  The invention according to claim 7 is the invention according to any one of claims 2 to 4, wherein the welding position of the leg portion of the block and the outer peripheral portion of the stator is a symmetrical position with respect to the axis of the main shaft. Because the deformation of the stator can be reduced by a welded part that is placed symmetrically with respect to the axis of the main shaft, the vibration that deforms the stator core into an ellipse is effective with a compact configuration. Can be reduced, electromagnetic noise can be prevented, and noise can be reduced.

  The invention according to claim 8 is the invention according to claim 2 or 3, wherein the block is manufactured by aluminum die casting or plastic processing of steel, so the structure is uniform, so there is no defect in the weld, Stable strength welding is possible, and the quality is stable.

  The invention according to claim 9 is the invention according to any one of claims 3 to 8, wherein the upper end of the suspension spring that supports the compressor body in the hermetic container is made of resin fixed to the stator. Since it is inserted into the snubber, the vibration of the compressor body is not transmitted to the suspension spring, so that the noise radiated from the sealed container can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the front of the hermetic compressor according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of a side surface of the hermetic compressor. 3 is a plan cross-sectional view of the stator, FIG. 4 is a cross-sectional view of the main part taken along line AA of FIG. 3, and FIG. 5 is an enlarged view of the welded portion. FIG. 6 is a plan sectional view of a stator adopting a different shape.

  In FIG. 1 to FIG. 3, oil 102 is stored in the inner bottom portion of the sealed container 101, and a compressor body 104 including an electric element 110 and a compression element 120 driven by the electric element 110 is accommodated, and for example, warming such as R600a Filled with hydrocarbon refrigerant with low coefficient. A power supply terminal 108 for supplying power to the electric element 110 is attached to the sealed container 101.

  First, the electric element 110 will be described.

  The electric element 110 includes a stator 112 formed by directly winding a winding 168 on a magnetic pole tooth 164 of an iron core 162 formed by laminating electromagnetic steel plates via an insulating material 166, and an inner diameter side of the stator 112 Is a DC brushless motor of a salient pole concentrated winding system including a rotor 114 having a permanent magnet 172 disposed in an iron core, and a winding 168 of the stator 112 is connected to an inverter drive circuit ( (Not shown) and a conductor. The insulating material 166 is composed of upper and lower insulating materials 166a and 166b formed by injection molding a liquid crystal polymer (liquid crystal polyester resin), which is a synthetic resin, and an insulating film 166c inserted in the slot of the iron core 162. . Further, a substantially conical snubber 170 is integrally formed on the lower insulating material 166b.

  The electric element 110 is operated at a plurality of frequencies between 20 r / sec and 80 r / sec by inverter driving.

  Next, the compression element 120 will be described.

  The compression element 120 is disposed above the electric element 110.

  The crankshaft 122 constituting the compression element 120 includes a main shaft 124 and an eccentric shaft 126, and also includes an oil supply mechanism 132 including a spiral groove provided on the surface of the main shaft 124. The oil supply mechanism 132 communicates from the lower end of the main shaft 124 immersed in the oil 102 to the upper end of the eccentric shaft 126. A block 128 made of aluminum die cast includes a bearing portion 130 and a cylinder 136 that rotatably support the main shaft 124.

  From the viewpoint of component strength and weldability, the aluminum die-cast block 128 is manufactured so that bubbles are not generated inside the component by a method such as evacuating the mold during molding. desirable.

  The piston 134 is reciprocally inserted into a cylinder 136 formed integrally with the block 128, and the cylinder 136 forms a compression chamber 140 together with the valve plate 138. The piston pin 142 attached to the piston 134 is rotatably inserted into the connecting means 144, and the eccentric shaft 126 is rotatably inserted into the connecting means 144 so that the connecting means 144 is connected to the eccentric shaft 126 and the piston 134. Are connected. Further, the suction muffler 150 is held by a cylinder head 146 that covers the valve plate 138.

  As shown in FIG. 4, the block 128 has four leg portions 176 on the lower side, the flat portion 176 a at the tip of the leg portion 176 contacts the upper end surface of the iron core 162, and extends downward from the flat portion 176 a. The inner surface of the extended portion 178 that comes out contacts the outer peripheral surface of the iron core 162. The leg portions 176 are arranged at equal intervals of 90 degrees around the central axis of the iron core 162, and are arranged at positions symmetrical with respect to the axis of the main shaft 124.

  Then, the legs 176 and the iron core 162 are fixed without using fastening means such as bolts, as shown in FIG. 5, by fixing the ends of the contact portions of the extension 178 and the iron core 162 by welding. Yes. This welding method is preferably by laser welding. Specifically, a YAG laser pulse is applied to the joint to form a circular melted part with a diameter of about 1 mm, and then the position is moved slightly so that a part of the melted part overlaps, and then the pulse is irradiated again. By doing so, a continuous weld 182 is formed.

  The operation and action of the hermetic compressor configured as described above will be described below.

  When the electric element 110 is energized from the inverter drive circuit, the rotor 114 rotates together with the crankshaft 122 by the magnetic field generated in the stator 112. As the main shaft 124 rotates, the eccentric shaft 126 rotates eccentrically, and this eccentric motion is converted into a reciprocating motion via the connecting means 144, and the piston 134 is reciprocated in the cylinder 136 to refrigerate the refrigerant gas in the sealed container 101. Is compressed into the compression chamber 140 and compressed.

  By this compression operation, noise vibration due to sliding, collision, and gas flow occurs in the compressor main body 104. However, the compressor main body 104 is supported by the suspension container 106 with respect to the hermetic container 101, and the upper end of the suspension spring 106 is locked by a resin snubber 170. The resin snubber 170 has a greater attenuation than metal. Therefore, it is possible to prevent noise vibration generated in the compressor main body 104 from being radiated as noise to the outside via the suspension spring 106 and the sealed container 101.

  Moreover, since the outer diameter part of the iron core 162 of the stator 112 has a substantially circular shape, the outer diameter part has a vibration mode in which it is deformed into an elliptical shape. For this reason, when an electric current flows through the electric element 110 and an electromagnetic force acts between the stator 112 and the rotor 114, a vibration is generated such that the iron core 162 is deformed into an elliptical shape. However, the stator 112 holds the outer diameter side with a leg portion 176 and an extension portion 178 that extend from the block 128, and the leg portions are arranged at positions symmetrical with respect to the central axis of the iron core 162. In addition, since the iron core 162 is prevented from expanding and contracting in the radial direction, it is possible to prevent an increase in vibration due to the vibration mode that deforms into an elliptical shape. As a result, noise caused by vibration of the electric element 110 can be reduced.

  By using a salient pole concentrated winding type in which a winding is directly wound around a magnetic pole tooth provided on an iron core via an insulating material, a small size and high efficiency can be obtained. On the other hand, compared to a distributed winding type motor, the slot portion is wide open, and since a strong magnetic force can be obtained with a permanent magnet, the stacking thickness is generally low, so the rigidity of the electric element is low, but the stator By holding the outer diameter portion with the leg portion of the block, the rigidity of the stator is improved, so that the compressor can be reduced in noise, small, and lightweight.

  In particular, in a DC brushless motor having a salient pole concentrated winding type stator 112 and a rotor 114 incorporating a permanent magnet 172, a small size and high efficiency can be obtained. On the other hand, compared with a distributed winding type electric motor, the slot portion has a large opening, and the permanent magnet 172 provides a strong magnetic force, so that the thickness of the iron core 162 is generally low, and the rigidity of the electric element is therefore low. Since the rigidity of the stator 112 is improved by holding the outer diameter portion of the stator 112 by the leg portion 176 and the extending portion 178, the vibration of the stator 112 can be prevented, and the noise reduction effect is remarkable.

  Further, when a neodymium magnet mainly composed of neodymium, iron, and boron is used as the permanent magnet 172, a strong magnetic force can be obtained, so that a DC brushless motor in which the thickness of the iron core 162 is further reduced can be configured. Even in this case, by holding the stator 112 with the leg portion 176 and the extending portion 178, the effect of preventing vibration becomes more remarkable.

  Further, when a cylindrical pipe material is provided on the outer diameter side of the stator 112, the pipe material with the open end is easily deformed into an oval shape unless the pipe material is made extremely thick. Therefore, the pipe material is also deformed with the electromagnetic vibration of the iron core 162, and the electromagnetic vibration is increased. However, according to the present invention, only the leg portion 176 and the extension portion 178 are increased in rigidity, so that vibration and noise can be effectively reduced with a compact configuration without substantially increasing the weight and outer shape of the hermetic compressor. Can be reduced.

  The welding of the stator 112 and the block 128 is performed by repeatedly irradiating the joint with a YAG laser pulse, thereby locally dissolving the material and performing cooling by gas in parallel. Thus, it can be limited to a limited part, the resin member such as the winding 168 and the insulating material 166 can be prevented from being damaged, and the insulation degradation of the electric element can be prevented. Furthermore, since distortion due to heat can be minimized, it is possible to prevent deterioration of the characteristics of the electromagnetic steel sheet and to prevent adverse effects such as efficiency reduction due to an increase in iron loss.

  In addition, the extension part 178 is arrange | positioned in the surface on the iron core 162 of the stator 112, and the welding part becomes the fillet which consists of the corner | angular part of the extension part 178, and the iron core 162, and also shows in FIG. If the extending part 178 is arranged in the recess of the iron core and the corner part of the extending part 178 and the corner part of the iron core 162 are in contact with each other, the width of the joint part by welding can be increased, which is even higher. It may be possible to obtain weld strength.

  The block 128 is formed by aluminum die-casting, and preferably is vacuum die-casting that prevents casting of air and oxide film by casting in a vacuum atmosphere, or casting in an oxygen atmosphere to form micropores by rapid solidification of the molten metal. Since it is manufactured by a method such as non-porous die casting method (PF die casting method) to prevent occurrence, the structure is uniform compared to cast iron generally used as the material of the block 128, and there are few defects such as nests inside. Laser welding that connects welding at small points also stabilizes the welding state, and there are no defects such as cavities and cracks inside the welded portion, so that sufficient welding strength can be obtained. Furthermore, by using a YAG laser, even an aluminum alloy that easily diffuses heat irradiates a small point with high energy instantaneously, so that welding can be efficiently performed with less energy.

  Even if the block 128 is formed by press forming of an iron plate, welding is further facilitated and productivity is improved.

  Further, since the snubber 170 is formed integrally with the insulating material 166b, the number of parts is reduced and productivity is improved as compared with the case where a resin-made snubber is separately formed.

  Furthermore, since the insulating material is made of LCP (Liquid Crystal Polymer), there are few extracts, few burrs, etc., and it has excellent elasticity compared to other resins, while maintaining strength and excellent vibration. Absorbent and noise can be reduced.

(Embodiment 2)
FIG. 7 is a plan sectional view of the stator of the hermetic compressor according to the second embodiment of the present invention.

  In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In FIG. 7, the iron core 262 of the stator 212 has nine magnetic pole teeth 264, and the outer periphery of the stator 212 is held by three legs 278. That is, nine magnetic pole teeth 264 that are three times as many as the three legs 278 are provided.

  Further, the leg portions 278 are arranged at equal intervals of 120 degrees with respect to the axis of the main shaft 124. For example, the leg portions 278 and the iron core 262 are laser welded on the outer diameter side 262a, 262b of the center line of the magnetic pole teeth 264a, 264b. It is fixed by.

  Since the magnetic core teeth 264a and 264b are wide in the radial direction, the iron core 262 has a high rigidity against deformation in the radial direction, and the intermediate portion 262c between the magnetic pole teeth 264a and the magnetic pole teeth 264b has a small radial width, so that the rigidity is also high. Low. When a magnetic attractive force is generated between the stator 212 and the rotor 114, the bending deformation of the intermediate portion 262c having low rigidity increases.

  The iron core 262 has magnetic pole teeth 264a and 264b with high rigidity and an intermediate part 262c with low rigidity periodically in the circumferential direction so that when the electric element is operated, it deforms in the radial direction as a whole. Vibration occurs.

  On the other hand, in the present invention, the number of the leg portions 278 is three, and the leg portions 278 and the iron core 262 are joined at the outer sides 262a and 262b of the magnetic pole teeth 264a and 264b, so that the rigidity is improved evenly. In addition, since the welding can be performed while avoiding the low rigidity portion of the intermediate portion 262c between the magnetic pole teeth 264a and the magnetic pole teeth 264b, the rigidity can be improved effectively, the vibration of the iron core 262 can be effectively reduced, and the electromagnetic Noise generation can be prevented and noise can be reduced. Furthermore, by welding on the outer sides 262a and 262b of the magnetic pole teeth 264a and 264b, the induced current generated in the welded portion can be reduced, and the efficiency of the electric element can be improved.

(Embodiment 3)
FIG. 8 is a plan sectional view of the stator of the hermetic compressor according to the third embodiment of the present invention.

  The same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 8, the iron core 362 of the stator 312 has six magnetic pole teeth 364, and the outer periphery of the stator 312 is held by three legs 378. That is, six magnetic pole teeth 364a and 364b that are twice as large as the three legs 378 are provided. Further, the leg portions 378 are arranged at equal intervals of 120 degrees with respect to the axis of the main shaft 124, and the leg portions 378 and the iron core 362 are laser-welded on the outer diameter side of the center line for all six magnetic pole teeth 364a and 364b. It is fixed. Therefore, the fixed position by welding is arranged at a position symmetrical to the axis of the main shaft 124.

  Therefore, the vibration of the iron core 362 is generated by the magnetic attractive force generated between the magnetic pole teeth 364a and 364b and the rotor 114, and when the magnetic attractive force is generated by a certain magnetic pole tooth 364a, the opposite magnetic pole tooth A magnetic attractive force is also generated in 364b, and the two magnetic pole teeth 364a and 364b are deformed inward, and an elliptical vibration mode that is deformed outward in a direction perpendicular to the two is easily generated.

  However, according to the present invention, the iron core 362 is fixed so as to be sandwiched in the diametrical direction by the outer sides 362a and 362b of the magnetic pole teeth 364a and 364b. Can be prevented. Therefore, vibration of the iron core 362 can be effectively reduced with a compact configuration, generation of electromagnetic noise can be prevented, and noise can be reduced.

  As described above, since the hermetic compressor of the present invention joins the outer diameter portion of the iron core and the leg portion of the block without using fastening means, the rigidity is improved to prevent the vibration of the stator, A hermetic compressor with low noise can be realized.

  As described above, since the hermetic compressor according to the present invention can reduce the noise of the compressor, it can be widely applied not only to household electric refrigerator-freezers, but also to air conditioners, vending machines, and other refrigeration apparatuses.

Front longitudinal sectional view of the hermetic compressor according to the first embodiment of the present invention. Side view longitudinal sectional view of the hermetic compressor in the same embodiment Plan sectional drawing of the stator in the embodiment Sectional drawing of the principal part in the AA line of FIG. Enlarged view of the weld Plan sectional drawing of the 2nd stator in the embodiment Plan sectional drawing of the stator in Embodiment 2 of this invention Plan sectional drawing of the stator in Embodiment 3 of this invention Front sectional view of a conventional hermetic compressor A longitudinal sectional view of the side of a conventional hermetic compressor Plan sectional view of a conventional electric element Vertical section of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Airtight container 104 Compressor main body 106 Suspension spring 110 Electric element 112,212,312 Stator 114 Rotor 120 Compression element 122 Crankshaft 124 Main shaft 128 Block 162,262,362 Iron core 164,264,264a, 264b, 364,364a , 364b Magnetic pole teeth 166 Insulating material 168 Winding 170 Snubber 176, 278, 378 Leg

Claims (9)

  An electric element composed of a rotor and a stator, and a compression element driven by the electric element are housed in a sealed container, and the compression element includes a crankshaft having the rotor fixed to a main shaft, and a plurality of legs. The hermetic compressor has a block holding the stator, and the leg portion holds at least an outer peripheral portion of the stator.   The hermetic compressor according to claim 1, wherein the leg portion of the block and the outer peripheral portion of the stator are joined by welding.   The hermetic compressor according to claim 1 or 2, wherein the electric element is a salient pole concentrated winding type in which a winding is directly wound around a magnetic pole tooth provided on an iron core via an insulating material.   The hermetic compressor according to claim 2 or 3, wherein the welding position is on the outer peripheral side of the magnetic pole teeth.   The hermetic compressor according to any one of claims 2 to 4, wherein when the number of leg portions of the block is n, the number of magnetic pole teeth provided on the iron core is an integral multiple of n.   The hermetic compressor according to any one of claims 2 to 4, wherein when the number of leg portions of the block is an even number, the leg portions are arranged at positions symmetrical with respect to the axis of the main shaft.   5. The welding position between the block leg and the outer peripheral part of the stator is a position symmetrical to the axis of the main shaft when the number of leg parts of the block is an even number. The hermetic compressor according to one item.   The hermetic compressor according to claim 2 or 3, wherein the block is manufactured by aluminum die casting or plastic processing of steel.   The hermetic compressor according to any one of claims 3 to 8, wherein an upper end of a suspension spring that elastically supports the compressor main body in a sealed container is inserted into a resin snubber fixed to a stator.

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