JP2004124781A - Hermetic compressor - Google Patents

Abstract

[PROBLEMS] A stator used in a hermetic compressor for fitting and fixing a stator core to a hermetic container requires a stator having an outer diameter corresponding to the inner diameter of the hermetic container, and the number of units produced is small. Was expensive for products with a large production volume.
By fixing a stator of an electric motor to a sealed container via a spacer, it is possible to use an electric motor having an outer diameter of the stator core smaller than an inner diameter of the sealed container, and the spacer includes a plurality of members. It is formed with. The spacer is formed of a plurality of members.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of a hermetic compressor.
[0002]
[Prior art]
FIG. 16 shows an example of the structure of a hermetic compressor. (For example, refer to Patent Document 1). In the figure, a cylindrical sealed container 1 composed of an upper container 1 (a), an intermediate container 1 (b), and a lower container 1 (c) has a compression element 2 as a lower part, and the compression element 2 is driven to drive a stator. An electric element 3 composed of 4 and a rotor 5 is accommodated in the upper part. The stator 3 is formed by laminating thin electromagnetic steel plates, and has a stator core 6 whose outer diameter is larger than the inner diameter of the intermediate sealed container 1 (b), and this core part is the intermediate sealed container 1 (b ) And fixed by shrinkage. The rotor 5 is an induction motor type having a cage conductor formed by casting aluminum on a rotor core 7 formed by laminating thin electromagnetic steel plates, or a permanent magnet motor having a permanent magnet disposed on the rotor core 7. The mold is general, and the rotor core portion is shrink-fitted to the rotary shaft 8 that drives the compression element 2. The compression element 2 is fixed to the lower sealed container 1 (c) by spot welding so that the centers of the stator 4 and the rotor 5 are substantially coaxial. The intermediate sealed container 1 (b), the upper sealed container 1 (a), and the lower container 1 (c) are fitted so that they partially overlap each other, and the outer periphery is sealed by welding.
[0003]
Next, the operation will be briefly described. The hermetic compressor is incorporated in a refrigeration circuit and encloses refrigerant and refrigeration oil that lubricates the compression element 2. When power is supplied to the electric element 3, the rotor 5 rotates to drive the compression element 2. Then, the refrigerant passes through the suction muffler 9 and is sucked into the compression element 2, compressed and then discharged into the sealed container 1. The refrigerant discharged from the compression element 2 has a clearance from the sealed container 1 of the electric element 3 disposed on the compression element 2, a through-hole 12 provided in the iron core of the stator 4 or the rotor 5, and the stator and rotation. It is sent into the refrigerant circuit from the discharge pipe 10 arranged in the upper container through the gap of the child. The refrigerating machine oil separated from the refrigerant before the refrigerant is discharged from the discharge pipe 10 passes through the through holes 12 provided in the iron cores of the stator 4 and the rotor 5, the stator 4 and the rotor. Return to the lower part of the sealed container 1 through the gap 5 and the like.
[0004]
In addition, regarding the structure of the motor, as a method of fixing the stator to a bracket having an inner diameter larger than the outer diameter of the stator (which is a hermetic container in a hermetic compressor), a fixing member is used between the bracket and the stator. Methods for fixing the child are known. In this case, although the gist of the present invention is different, the inner case for cooling the stator by circulating the cooling liquid from the outside is made of a magnetic material and used as a part of the stator. The purpose is to reduce the size. (For example, refer to Patent Document 2).
[0005]
[Patent Document 1]
JP 2000-303960 A (2nd page, FIG. 3)
[Patent Document 2]
JP-A-6-62574 (first page, FIG. 1)
[0006]
[Problems to be solved by the invention]
Hermetic compressors are manufactured from those with a refrigeration capacity of about 200 W for dehumidifiers and refrigerators to those with a refrigeration capacity of over 20 kW for store air conditioners depending on the application. Therefore, the diameter of the sealed container that accommodates the compression element varies accordingly. Since the stator is shrink-fitted in the closed container as described above, an outer diameter stator corresponding to the inner diameter of the closed container is required.
[0007]
In addition, if the outer diameter of the stator core is different in the stator production equipment, the equipment cannot be shared or a large setup change occurs. There was a problem that the same capital investment as the belt was necessary and the cost was high.
[0008]
The present invention has been made to solve the above-described problems. The object of the present invention is to provide an electric motor in which the outer diameter of the stator is smaller than the inner diameter of the hermetic container and is inexpensively sealed without interfering with the refrigerant and refrigerant oil passages. A mold compressor is obtained.
[0009]
Another object of the present invention is to obtain a hermetic compressor that reduces the amount of material used and reduces noise and vibration.
[0010]
Another object of the present invention is to provide an electric motor having a stator whose outer diameter is smaller than the inner diameter of the hermetic container, and to obtain an inexpensive hermetic compressor without obstructing the passage of refrigerant and refrigerating machine oil. Secure the stator with a uniform holding force with respect to the radius and the length direction of the cylindrical shape of the sealed container, and cylindricity and roundness from the outer periphery of the sealed container to the inner periphery of the stator via a spacer Is to secure.
[0011]
[Means for Solving the Problems]
The outer diameter of the stator is the inner diameter of the hermetic container before being fixed to the hermetic container by a spacer that fills the gap between the outer diameter of the stator and the inner diameter of the hermetic container and provides a space penetrating in the rotation axis direction. It has a smaller relationship.
[0012]
Further, a spacer provided with a space penetrating in the direction of the rotation axis fills the gap between the outer diameter of the stator and the inner diameter of the hermetic container, and the length of the spacer in the rotation axis direction is greater than the axial length of the stator core. Is also shortened.
[0013]
Further, the spacer provided with a space penetrating in the direction of the rotation axis fills the gap between the outer diameter of the stator and the inner diameter of the sealed container, and uniformly raises and lowers the temperature of the sealed container and the entire spacer. Then, the stator and the spacer on the outer periphery of the stator are shrink-fitted and fixed, and then the spacer and the sealed container on the outer periphery of the spacer are shrink-fitted and fixed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a hermetic compressor. Here, the outer diameter of the stator 4 is smaller than the inner diameter of the intermediate container 1 (b). In order to fix the stator 4 to the intermediate sealed container 1 (b), the outer diameter of the stator 4 A spacer 11 is disposed between the inner sealed container inner diameter. FIG. 1 shows an example of the structure of a hermetic compressor. In the figure, a cylindrical sealed container 1 composed of an upper sealed container 1 (a), an intermediate sealed container 1 (b), and a lower sealed container 1 (c) has a compression element 2 at the bottom and the compression element 2 at the bottom. The electric element 3 that is driven and includes the stator 4 and the rotor 5 is accommodated in the upper part. The stator 3 is formed, for example, by laminating thin electromagnetic steel plates, and has a stator core 6 whose outer diameter is larger than the inner diameter of the intermediate sealed container 1 (b), and this core part is the intermediate sealed container 1 ( It is shrink-fitted and fixed to b). The rotor 5 is an induction motor type having a squirrel-cage conductor formed by casting aluminum on a rotor core 7 formed by laminating thin electromagnetic steel plates, or a permanent magnet motor having a permanent magnet disposed on the rotor core 6. In general, the rotor 5 core portion is shrink-fitted to a rotating shaft 8 that drives the compression element 2. The compression element 2 is fixed to the lower sealed container 1 (c) by spot welding so that the centers of the stator 4 and the rotor 5 are coaxial. The intermediate sealed container 1 (b), the upper sealed container 1 (a), and the lower sealed container 1 (c) are fitted so as to partially overlap each other, and the outer periphery is sealed by welding.
[0015]
Next, the operation will be briefly described. The hermetic compressor is incorporated in a refrigeration circuit and encloses refrigerant and refrigeration oil that lubricates the compression element 2. When power is supplied to the electric element 3, the electric element 3 rotates the rotor 5 to drive the compression element 2. Next, the refrigerant passes through the suction muffler 9 and is sucked into the compression element 2, compressed by the compression element 2, and then discharged into the sealed container 1. The refrigerant discharged from the compression element 2 is a gap between the electric element 3 disposed on the compression element 2 and the sealed container 1, and a through hole provided in the iron core of the stator 4 or the rotor 5. Then, the air passes through the gap between the stator 4 and the rotor 5 and is sent into the refrigerant circuit from the discharge pipe 10 disposed in the upper container 1 (a). Refrigerating machine oil separated from the refrigerant before the refrigerant is discharged from the discharge pipe 10 passes through holes provided in the iron cores of the stator 4 and the rotor 5, the stator 4 and the rotor 5. Through the gap and the like to return to the lower part of the sealed container 1.
[0016]
The figure which looked at the electric element from the airtight container upper part in FIG. 2 is shown. In the figure, the spacer 11 is positioned by shrink fitting on the inner periphery of the sealed container 1 and the stator 4 is positioned by shrink fitting on the inner periphery of the lower portion of the mounting circuit of the sealed container 1. The electric element 3 includes a connection terminal connected to a power source connected by an electric wire, and is mounted with an electronic circuit board and has a stator 4 joined to the electronic circuit board as a component thereof, and the inner surface of the stator is opposed to the stator 4. It consists of a rotor 5, and this rotor 5 is shrink-fitted on the rotating shaft 8 at its center. The through-hole 12 is a hole provided in the inner periphery of the spacer 11 and the hermetic container 1 and in the rotor 5 for circulating refrigerant and refrigerating machine oil, and the notch 13 is similarly used as a flow path for the refrigerant and refrigerating machine oil. The spacer 11 is provided.
[0017]
FIG. 3 shows a perspective view of the spacer 11. The spacer has an integral structure, and a notch 13 penetrating in the direction of the rotation axis is provided between the sealed container and the spacer so as to form a through hole 12 as a flow path for the refrigerant and the refrigerating machine oil. The inner diameter of the spacer is smaller than the outer diameter of the stator, and the spacer is coupled to the stator by shrink fitting. The outer diameter of the spacer 11 coupled to the stator 4 is larger than the inner diameter of the sealed container 1, and is fixed to the sealed container by shrink fitting.
[0018]
FIG. 4 shows a step of shrink-fitting and fixing the stator 4 and the spacer 11, and FIG. 5 shows a step of shrink-fitting and fixing the airtight container 1 and the stator 4 to the spacer 11. In FIG. 4A, before the stator 4 is fixed to the spacer 11, the inner diameter Di of the spacer 11 is smaller than the outer diameter dco of the stator 4, but the spacer 11 is heated and the spacer 11 is heated. The inner diameter Di is equal to the outer diameter dco of the stator 4. In FIG. 4 (a), the spacer 11 is held by a jig from above and begins to descend. In FIG. 4 (b), which is the next step, the spacer 11 continues to descend further, and the stator 4 is inserted inside thereof. The Next, the spacer 11 is cooled by air or the like, and the inner diameter Di of the spacer 11 contracts to return to a state smaller than the outer diameter dco of the stator 4, and the spacer 11 is fixed to the stator 4. Thus, the spacer 11 can be secured to the stator 4 with a uniform holding force with respect to the radius and the length direction of the cylindrical shape of the spacer 11. Further, by adopting a method in which the temperature of the entire spacer 11 is uniformly raised and lowered and shrink-fitted and fixed to the stator 4, the inner circumference of the spacer 11 and the outer circumference of the stator 4 are cylindrical and round. The degree can be secured.
[0019]
In FIG. 5, the outer diameter Do of the spacer 11 is larger than the inner diameter dsi of the sealed container 1 before the spacer 11 is fixed to the sealed container. The hermetic container 1 is heated, the inner diameter dsi of the hermetic container 1 becomes larger than the outer diameter Do of the spacer 11, and the hermetic container 1 is fixed by a jig from above and starts to descend, and the spacer 11 is inserted inside.
[0020]
In FIG. 6, the said airtight container 1 shows the state which was fixed with the jig from the upper side and descended. As shown in the figure, the spacer 11 is inserted inside the sealed container 1. The sealed container 1 is cooled with air or the like, and the inner diameter dsi of the sealed container 1 tries to return to a state smaller than the outer diameter Do of the spacer 11, and the spacer 11 is fixed to the sealed container 1. The stator 4 is fixed to the inner periphery of the hermetic container 1 via the spacer 11 to complete a series of steps. As described above, the sealed container 1 can be secured with a uniform holding force with respect to the spacer 11 with respect to the radius and the length direction of the cylindrical shape of the sealed container 1. Further, by adopting a method in which the temperature of the entire sealed container 1 is uniformly raised and lowered and shrink-fitted and fixed to the spacer 11, cylindricity and roundness can be secured on the inner periphery of the sealed container 1 and the outer periphery of the spacer 11. .
[0021]
As described in the description with reference to FIGS. 4 to 6, the sealed container 1 can secure the stator 4 with a uniform holding force with respect to the radius and the length direction of the cylindrical shape of the sealed container 1. In addition, the temperature of the closed container 1 and the entire spacer 11 is uniformly raised and lowered, and is fixed by being shrink-fitted to the spacer 11 to fix the fixed from the outer periphery of the closed container 1 via the spacer 11. Cylindricality and roundness can be secured on the inner periphery of the child 4.
[0022]
As described above, the stator 4 having the outer diameter of the stator 4 smaller than the inner diameter of the hermetic container 1 can be mounted in the hermetic container 1, so that it has been conventionally used for a hermetic compressor having a smaller inner diameter of the hermetic container 1. The electric motor can be used. Since the generated torque of the electric motor is proportional to the length of the stator core 6, the torque that is deficient when the outer diameter is reduced can be compensated for by increasing the length of the core. The generated torque of the motor is also proportional to the magnetic flux density in the gap between the rotor and the stator. In particular, rare earth magnets with a maximum energy product of about 10 times that of the conventional mainstream ferrite magnets are used. In the conventional permanent magnet motor, even when an electric motor having a small outer diameter is used for the sealed container 1, the length of the stator core does not have to be so long as that of the conventional core.
[0023]
In addition, if the outer diameter of the stator core is different in the production facilities of the motor, the facilities cannot be shared or a large setup change occurs. Therefore, sharing the outer diameter is effective in reducing production costs and capital investment.
[0024]
Embodiment 2. FIG.
Configurations and operations other than those described in the following embodiments are the same as those in the first embodiment. FIG. 7 shows a sectional view of the hermetic compressor. In the example of the present embodiment, the length L2 of the spacer is shorter than the iron core length L1 of the stator as long as the holding force of the stator can be secured. During compressor operation, if the natural frequency of the stator 4 is close to an integral multiple of the operating frequency, noise and vibration will increase, but the length of the spacer L2 should be shorter than the iron core length L1 of the stator. Thus, the natural frequency can be shifted from an integral multiple of the operating frequency, and noise and vibration can be reduced. In addition, since the amount of spacer material used can be reduced, it is effective in reducing costs and saving resources.
[0025]
In FIG. 7, reference numeral 1 denotes a cylindrical sealed container including an upper sealed container 1 (a), an intermediate sealed container 1 (b), and a lower sealed container 1 (c). 2 is driven, and an electric element 3 including a stator 4 and a rotor 5 is accommodated in the upper part. The stator 4 has a stator core 6 that is formed by laminating thin electromagnetic steel sheets or the like and has an outer diameter smaller than the inner diameter of the intermediate sealed container, and this iron core portion is attached to the intermediate sealed container 1 (b). It is shrink-fitted and fixed via the spacer 11. The rotor 5 is an induction motor type having a cage conductor formed by casting aluminum on a rotor core 7 formed by laminating thin electromagnetic steel plates, or a permanent magnet motor type having a permanent magnet disposed on the rotor core. The rotor core portion is shrink-fitted to the rotary shaft 8 that drives the compression element 2. The compression element 2 is fixed to the lower sealed container by spot welding so that the centers of the stator and the rotor are substantially coaxial. The intermediate sealed container 1 (b), the upper sealed container 1 (a), and the lower sealed container 1 (c) are fitted so that they partially overlap each other, and the outer periphery is sealed by welding.
[0026]
Next, the operation will be described with reference to FIG. When the hermetic compressor is manufactured as a refrigeration air conditioner, the refrigerant and the refrigerating machine oil that lubricates the compression element 2 are incorporated in the hermetic container 1 and incorporated in the refrigeration circuit. When power is supplied to the electric element 3, the electric element 3 rotates to drive the compression element 2. The refrigerant passes through the suction muffler 9 and is sucked into the compression element 2, compressed, and then discharged into the sealed container 1. The refrigerant discharged from the compression element 2 is a gap between the electric element 3 disposed on the compression element 2 and the sealed container 1, a through hole provided in the iron core of the stator 4 or the rotor 5, It passes through the gap between the stator 4 and the rotor 5 and the like, and is sent into the refrigerant circuit from the discharge pipe 10 disposed in the upper sealed container 1 (a). The refrigerating machine oil separated from the refrigerant before the refrigerant is discharged from the discharge pipe 10 is a through-hole provided in the iron core of the stator 4 or the rotor 5, or a gap between the stator 4 and the rotor 5. Etc. and return to the lower part 1 (c) of the sealed container.
[0027]
The figure which looked at the electric element from the airtight container upper part in FIG. 8 is shown. In the figure, the spacers 11 tightly fixed to the inner wall of the hermetic container 1 alternate with the through holes 12 in the circumferential direction, and between the hermetic container 1 and the stator 4 in the radial direction, like the through holes 12. Occupies space. FIG. 9 is a perspective view of the spacer 11. Since the spacer 10 is formed of a plurality of similar members, the flow path of the refrigerant and the refrigerating machine oil can be made wider than that manufactured by a single structure, and the inner diameter of the hermetic container 1 and the stator core 6 can be increased. This is effective when the difference in outer diameter is small and it is difficult to secure the flow paths for the refrigerant and the refrigerating machine oil by providing the notches in the spacer 11 or the through holes 12.
[0028]
Further, by fitting the concave portion provided on the outer peripheral portion of the stator 4 and the convex portion provided on the spacer 11, the spacer can be easily positioned and the assemblability can be improved. Also, by fitting the convex portion provided on the outer peripheral portion of the stator 4 with the concave portion provided on the inner peripheral portion of the spacer 11, the spacer can be easily positioned and the assemblability is improved.
[0029]
FIG. 10 shows a case where the length L2 of the spacer 11 is shorter than the iron core length L1 of the stator 4 within a range in which the holding force of the stator 4 can be secured, and the length L2 of the spacer 11 is It is the figure which displayed typically the vibration characteristic of the stator at the time of compressor operation as the amplitude of the stator 4 with respect to a horizontal axis frequency versus excitation force about the case where it is equal to the iron core length L1. When the length L2 of the spacer 11 is made equal to the core length L1 of the stator 4, if the natural frequency is close to an integer multiple of the operating frequency, the response in the case of the frequency value nf corresponding to the natural frequency is the frequency nf. The maximum value is taken in the vicinity, and noise and vibration increase. On the other hand, the characteristic curve of FIG. 10 also shows the case where the natural frequency is shifted from an integral multiple of the operating frequency by making the stator length L2 shorter than the iron core length L1. In the figure, the maximum value indicated as L1> L2 is lower than the maximum value at the frequency = nf in the characteristic curve of L1 = L2, indicating the effect of reducing noise and vibration.
[0030]
Embodiment 3 FIG.
Configurations and operations other than those described in the following embodiments are the same as those in the first embodiment and the second embodiment. FIG. 11 shows a view of the electric element from the top of the sealed container, and FIG. 12 shows the structure of the spacer. The spacer is formed by laminating thin electromagnetic steel plates, and is provided with a through hole 12 in the direction of the rotation axis as a flow path for refrigerant and refrigerating machine oil, and is connected via an uneven first caulking 14 and a second caulking 15. Has been. By using a thin electromagnetic steel sheet for the spacer part, it is possible to use the spacer part as a magnetic path for magnetic flux leaking from the stator core, which contributes to improving the efficiency of the compressor by reducing the magnetic flux density of the stator core. . The material of the electromagnetic steel sheet may not be the same as that of the stator core or the rotor core.
[0031]
Thin-walled electrical steel sheets are improved in material yield by punching in a line as shown in FIG. In the punched electrical steel sheet, the first core member 16 and the second core member 17 are alternately laminated, the first caulking 14 connects the core members in the laminating direction, and the second caulking 15 In addition to joining the magnetic steel sheets in the stacking direction, it contributes to the connection of the core members in the circumferential direction, and is connected rotatably around the caulking. The spacers stacked at a predetermined height can be assembled so as to be wound around the stator core by rotating around a connecting portion that is rotatably connected. The wound spacer is joined to the stator by welding the joints at both ends, and is shrink-fitted into the sealed container.
[0032]
In this way, when the spacer is constituted by a member that is rotatably connected, since the stress generated in the stator core 6 when the stator 4 is fitted is dispersed, deformation due to the stress of the stator core is prevented. In addition, a highly efficient and low noise compressor can be provided by reducing iron loss due to magnetostriction and ensuring the roundness of the inner diameter of the stator.
[0033]
Further, when this spacer is used for a stator using a stator core having a connecting portion as in the case of the spacer, the stator is fixed by fixing the connecting portions in the circumferential direction so as not to overlap as shown in FIG. The magnetic resistance of the magnetic flux leaking from the iron core to the spacer can be reduced as compared with the case where the connecting portions overlap, contributing to improvement in efficiency.
[0034]
As a method of connecting the plurality of spacer members, the spacer members may be rotatably connected by inserting pins instead of caulking.
[0035]
Further, the core members in the stacking direction may be connected by welding instead of caulking.
[0036]
Embodiment 4 FIG.
Configurations and operations other than those described in the following embodiments are the same as those in the first embodiment, the second embodiment, and the third embodiment. FIG. 13 shows a sectional view of the hermetic compressor, and FIG. 14 shows a structure diagram of the spacer. The spacer is made by laminating laminated magnetic steel sheets and connecting each member in a freely rotatable manner. The concave portion provided on the outer peripheral portion of the stator and the convex portion provided on the spacer are provided only in the center portion, and the spacer When winding, it is possible to suppress not only the circumferential displacement but also the axial displacement.
[0037]
In FIG. 13, reference numeral 1 denotes a cylindrical hermetic container composed of an upper hermetic container 1 (a), an intermediate hermetic container 1 (b), and a lower container 1 (c). The electric element 3 composed of the stator 4 and the rotor 5 is housed in the upper part. The stator 4 has a stator core 6 formed by laminating thin electromagnetic steel plates or the like, and has an outer diameter smaller than the inner diameter of the intermediate container, and this iron core portion attaches the spacer 11 to the intermediate container 1 (b). It is shrink-fitted and fixed. The rotor 5 is an induction motor type having a cage conductor formed by casting aluminum on a rotor core 7 formed by laminating thin electromagnetic steel plates, or a permanent magnet motor type having a permanent magnet disposed on the rotor core. The rotor core portion is shrink-fitted to the rotary shaft 8 that drives the compression element 2. The compression element 2 is fixed to the lower container by spot welding so that the centers of the stator and the rotor are substantially coaxial. The intermediate sealed container 1 (b), the upper sealed container 1 (a), and the lower sealed container 1 (c) are fitted so as to partially overlap each other, and the outer periphery is sealed by welding.
[0038]
Next, the operation will be described with reference to FIG. When the hermetic compressor is manufactured as a refrigerator or an air conditioner, a refrigerant and a refrigerating machine oil that lubricates the compression element 2 are incorporated in the hermetic container 1 and incorporated in a refrigeration circuit. When power is supplied to the electric element 3, the electric element 3 rotates to drive the compression element 2. The refrigerant passes through the suction muffler 9 and is sucked into the compression element 2, compressed and then discharged into the sealed container 1. The refrigerant discharged from the compression element 2 is a gap between the electric element 3 disposed on the compression element 2 and the sealed container 1, a through hole provided in the iron core of the stator 4 or the rotor 5, It passes through the gap between the stator 4 and the rotor 5 and the like, and is sent into the refrigerant circuit from the discharge pipe 10 arranged in the upper container 1 (a). The refrigerating machine oil separated from the refrigerant before the refrigerant is discharged from the discharge pipe 10 is a through-hole provided in the iron core of the stator 4 or the rotor 5, or a gap between the stator 4 and the rotor 5. Etc. and return to the lower part 1 (c) of the sealed container.
[0039]
Further, after the spacer 11 is fixed to the stator 4, when the outer diameter roundness of the spacer 11 is poor and the fitting with the sealed container 1 is severe, the outer periphery may be cut. As shown as the shape, the stator 4 and the iron core of the rotor 5 are annularly formed by forming the spacer 11 and the stator core 6 concentrically with the same punching die and punching the spacer 11. The roundness can be improved, the fitting property to the sealed container can be improved, and the adhesion with the stator core can be improved.
[0040]
Although the rotary type compressor has been described here, it goes without saying that the mechanism of the compression element such as the scroll type compressor is not limited as long as the stator is fitted in the hermetic container.
[0041]
【The invention's effect】
According to this invention, by fixing the motor having a small stator core outer diameter with respect to the inner diameter of the hermetic container to the hermetic container via the spacer, without disturbing the flow of the refrigerant and the refrigerating machine oil in the hermetic compressor, The stator can be securely fixed to the sealed container via the spacer, and the same motor model can be applied to compressors of different models. Low-cost and high-performance sealing is achieved by reducing setup changes during production and reducing capital investment. A mold compressor can be provided.
[0042]
According to this invention, by fixing the motor having a small stator core outer diameter with respect to the inner diameter of the hermetic container to the hermetic container via the spacer, without disturbing the flow of the refrigerant and the refrigerating machine oil in the hermetic compressor, The stator can be securely fixed to the sealed container via the spacer, and the same motor model can be applied to compressors of different models. Low-cost and high-performance sealing is achieved by reducing setup changes during production and reducing capital investment. And providing a hermetic compressor capable of reducing noise and vibration since the length of the stator core in the direction of the rotation axis is greater than the length of the spacer in the direction of the rotation axis. Is possible.
[0043]
According to the present invention, the stator can be securely fixed to the sealed container via the spacer without interfering with the flow of the refrigerant and the refrigerating machine oil in the hermetic compressor, and the same motor model can be applied to different compressors. It is possible to provide an inexpensive and high-performance hermetic compressor by reducing setup change during production and restraining capital investment. Also, the hermetic container has a radius and the length of the cylindrical shape of the hermetic container. It is possible to provide a hermetic compressor that secures the stator with a uniform holding force and that can ensure cylindricity and roundness from the outer periphery of the hermetic container to the inner periphery of the stator via the spacer.
[0044]
[Brief description of the drawings]
FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention.
FIG. 2 is a view of the electric element as seen from the top of the sealed container, showing an embodiment of the present invention.
FIG. 3 is an airtight container and spacer assembly process diagram showing an embodiment of the present invention.
FIG. 4 is a stator and spacer assembly process diagram showing an embodiment of the present invention.
FIG. 5 is a view of the electric element as seen from the top of the sealed container, showing an embodiment of the present invention.
FIG. 6 is a completed view of an airtight container and a spacer showing an embodiment of the present invention.
FIG. 7 is a sectional view of a hermetic compressor showing an embodiment of the present invention.
FIG. 8 is a view of the electric element as seen from the top of the sealed container, showing an embodiment of the present invention.
FIG. 9 is a spacer perspective view showing an embodiment of the present invention.
FIG. 10 is a diagram illustrating the vibration characteristics of the stator when the compressor is operating.
FIG. 11 is a view of the electric element as seen from the top of the sealed container, showing an embodiment of the present invention.
FIG. 12 is a spacer structure diagram showing an embodiment of the present invention.
FIG. 13 is a sectional view of a hermetic compressor showing an embodiment of the present invention.
FIG. 14 is a perspective view of a spacer showing an embodiment of the present invention.
FIG. 15 is a punching shape diagram of an iron core showing an embodiment of the present invention.
FIG. 16 is a sectional view of a hermetic compressor showing a conventional example.
[Explanation of symbols]
1 airtight container, 1 (a) upper airtight container, 1 (b) middle airtight container
1 (c) Lower sealed container, 2 compression element, 3 electric element, 4 stator 5 rotor, 6 stator core, 7 rotor core, 8 rotating shaft, 9 suction muffler, 10 discharge pipe, 11 spacer, 12 through Hole, 13 notch, 14 first caulking, 15 second caulking, 16 first core member, 17 second core member

Claims (10)

An electric element composed of a rotor fixed around a rotation axis of a compression element disposed in the lower part of the hermetic container, and a stator disposed radially opposite the rotor; A compression element fixed in the container and driven by rotating the rotating shaft by the electric element, and before being fixed to the sealed container, the outer diameter of the stator is smaller than the inner diameter of the sealed container. A hermetic compressor. An electric element composed of a rotor fixed around a rotation axis of a compression element disposed in the lower part of the hermetic container, and a stator disposed radially opposite the rotor; A compression element fixed in the container and driven by rotating the rotating shaft by the electric element; and a spacer filling a gap provided between the outer diameter of the stator and the inner diameter of the hermetic container. Further, the length in the rotation axis direction of the iron core portion of the stator is equal to or longer than the length of the spacer in the rotation axis direction. A rotor fixed around the rotation axis of the compression element disposed in the lower part of the hermetic container, and a stator that is disposed to face the rotor in the radial direction and is shrink-fitted and fixed to the inner wall of the hermetic container An electric element composed of: a compression element fixed at the lower part of the electric element in the direction of the rotation axis and driven by rotating the rotation axis by the electric element; and an outer diameter of the stator. A hermetic compressor comprising: a spacer that is shrink-fitted to the inner diameter of the hermetic container later to fill a gap between the outer diameter of the stator and the inner diameter of the hermetic container. The hermetic compressor according to any one of claims 1 to 3, wherein the spacer is formed of a plurality of members. The hermetic compressor according to any one of claims 1 to 4, wherein members constituting the spacer are connected to each other through a connecting portion. One of the inner peripheral portion of the spacer and the outer peripheral portion of the stator is formed as a concave or convex portion, and the concave and convex portions on the inner peripheral portion of the spacer and the concave and convex portions on the outer peripheral portion of the stator are fitted. The hermetic compressor according to any one of claims 1 to 5. 7. The hermetic compressor according to claim 1, wherein the spacer is divided into two or more in the circumferential direction with respect to the inner wall of the hermetic container and is discontinuously arranged. The hermetic compressor according to any one of claims 1 to 7, wherein the spacer is formed by laminating electromagnetic steel sheets. 9. The hermetic compressor according to claim 1, wherein the spacer and the stator core are formed by punching from the same punching die. 9. The hermetic compressor according to claim 1, wherein the spacer, the stator, and the rotor are formed by punching from the same punching die.

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