JP2005146937A - Fluid machine and manufacturing method thereof - Google Patents

Abstract

An object of the present invention is to prevent a winding 7 and an insulating member 8 of a stator 6 from being burned out when a stator 6 is shrink-fitted or welded to a shell shell 4 serving as a container 1.
When a stator 6 is shrink-fitted or welded to a shell shell 4, the stator 6 is cooled while being cooled by a cooling means 21 to prevent the stator 6 from becoming high temperature. The stator 6 can be securely fixed to the shell 4 without burning out heat-sensitive parts such as the covering of the winding 7 and the insulating member 8. Further, since the cooling of the shell 4 is completed in a short time, the productivity can be improved.
[Selection] Figure 1

Description

  The present invention relates to a fluid machine incorporating an electric motor used for household refrigeration cycle application equipment and the like, and a method of manufacturing the fluid machine. The present invention relates to a high-pressure fluid machine and a manufacturing method thereof.

  In recent years, natural refrigerants such as ammonia and carbon dioxide have begun to be reviewed from the viewpoint of environmental protection. Among them, carbon dioxide refrigerant has attracted attention as an extremely easy-to-handle refrigerant because it is not toxic and flammable. Application is progressing. In these devices, a hermetic compressor which is a fluid machine with a built-in electric motor is generally used. A scroll type, a rotary type or the like is often used as the compression mechanism.

  FIG. 5 shows a longitudinal sectional view of a conventional compressor using a scroll type that compresses refrigerant such as R22 and R410A. As shown in FIG. 5, the sealed container 1 includes a cylindrical shell shell 4 to which an electric motor 2 and a compression mechanism 3 are attached, and an upper shell 5 a and a lower shell 5 b that are disposed in close contact with both ends of the sealed container 1 over the entire circumference. It is formed by welding. The sealed container 1 is made of a steel plate having a thickness of about 3 mm, and the stator 6 is fixed to the shell 4 by shrinkage by inserting the stator 6 into the heated shell shell 4 (for example, Patent Document 1).

In a hermetic compressor that requires high pressure and a high compression ratio, such as a refrigeration cycle using a carbon dioxide refrigerant, the pressure in the hermetic container 1 is high, so it is necessary to ensure pressure resistance. For this purpose, the thickness of the shell shell 4 and the upper and lower shells 5a and 5b of the sealed container 1 is increased, and the joint portions of the shell shell 4 and the like to be the sealed container 1 and each member are securely and firmly joined by welding or the like. Need to be fixed.
JP 2002-161856 A

  However, as the thickness of the shell 4 is increased, the following problem has occurred.

  FIG. 6 is a cross-sectional view of the hermetic compressor (broken line portion A in FIG. 5), and shows a case where the thickness of the shell shell 4 having the conventional configuration is increased. The plate thickness of the shell 4 of the conventional hermetic compressor of FIG. 5 is about 3 mm. As shown in FIG. 5, the winding 7 is installed in the slot portion 9 of the stator 6 with the insulating member 8 interposed therebetween. In such a configuration, when the thickness of the shell shell 4 is about 7 mm, which is twice or more, the heat capacity of the shell shell 4 increases, so that when the shrinkage is heated, a great amount of heat is transferred from the shell shell 4 to the stator 6. When the temperature of the flow stator 6 rises, the winding 7 of the stator 6 and its insulating member 8 are burned out, the body shell 4 and the stator 6 are thermally deformed, and the movable element 2b of the electric motor 2 (see FIG. 5). There were problems in reliability and performance, such as a gap in the gap (air gap).

  Further, since the rigidity of the shell shell increases as the shell shell becomes thicker, if the tightening allowance of the shrinkage is increased, deformation of the tightening margin will occur on the stator side from the shell shell. On the other hand, if the tightening margin is small, when carbon dioxide, etc., which has a high pressure inside the container, is used for the refrigerant, the inner diameter of the shell shell expands and expands due to the pressure, and there is no clearance between the stator and the fixed gap. In some cases, the child rotates or falls off, and the shrinkage allowance range of the shell and the stator needs to be managed narrower than in the case of the conventional structure. Therefore, in order to ensure an appropriate tightening allowance, higher accuracy is required for the inner diameter of the shell 4 and the outer diameter of the stator 6 than in the conventional example, which has a problem in cost.

  On the other hand, to reduce the temperature rise of the stator, if the heating temperature of the shell is reduced during shrinkage, the inner diameter cannot be expanded by an amount equivalent to the shrinkage allowance and the stator cannot be inserted. There was a problem.

  In order to eliminate such a problem, for example, a structure in which the shell is made into a double structure including an inner cylinder for fixing an electric motor and a compression mechanism and an outer cylinder having a high pressure resistance has been proposed.

  In this case, when heat is applied to the outer cylinder during shrinkage or welding, the influence of heat on the electric motor can be suppressed, so that the winding and the insulating member can be prevented from being burned out. In addition, even if the outer cylinder is thermally deformed, the deformation of the inner cylinder can be suppressed, so that the deviation of the air gap of the electric motor can be prevented.

  However, the configuration employing such a double structure has a problem in productivity because the structure becomes complicated and the number of production steps increases.

  The present invention solves the above-described conventional problems, and provides a fluid machine in which an electric motor is securely fixed to a thick container that can withstand high pressure while protecting an insulating member and an electric wire of a stator from thermal damage, and a manufacturing method thereof. It is intended to provide.

  In order to solve the above-described conventional problems, the method of manufacturing a fluid machine according to the present invention is to fix the shrinkage by inserting the stator into the heated shell shell while cooling the stator of the electric motor by the cooling means. . Thereby, since the stator is continuously cooled by the cooling means, it is possible to prevent the stator from becoming high temperature during shrinkage.

  In the method for manufacturing a fluid machine according to the present invention, the body shell and the stator are welded and fixed through a through hole provided in the body shell while the stator of the electric motor is cooled by cooling means. Thus, even when the inner and outer diameters of the shell and the stator are not tight or small, the stator continues to be cooled by the cooling means, so that the stator can be prevented from becoming hot during welding.

  Furthermore, the fluid machine of the present invention is to fix the body shell and the stator by welding through a through-hole having a diameter smaller than the plate thickness provided in the body shell. Accordingly, since the heat during welding can be reduced without using a cooling means as described above, the strength of the joint can be ensured and the stator can be prevented from becoming high temperature.

  According to the method for manufacturing a fluid machine of the present invention, when the stator of the motor of the fluid machine is shrink-fitted or welded to the shell, the temperature of the stator is weak to the heat of the coating of the winding or the insulating member. It is possible to prevent a rise to a dangerous value that may damage the parts.

  Therefore, it is possible to securely fix the stator to the shell without damaging the heat-sensitive parts such as the winding covering made of resin material and the insulating member, and the shell shell can be cooled quickly. Since the process is completed in time, a highly reliable fluid machine can be realized with high productivity.

The first invention of the present application is to manufacture a fluid machine in which a fluid transport mechanism and an electric motor for driving the same are housed in a container having a cylindrical shell, and a stator of the motor is inserted and fixed in the shell. In the method, after the shell shell is heated, the shell shell and the stator are fixed by shrinkage while the stator is cooled by a cooling means, and the shell shell and the stator are fixed to the stator at the time of shrinkage. Since the heat generated is absorbed by the cooling means and the cooling means with the cooling surface, the temperature of the stator rises to a dangerous value that damages heat-sensitive components such as the coating of the windings and insulation members. Can be prevented.

  In the second invention, the shell shell and the stator are fixed by welding, and in the first invention, the shell shell and the stator can be fixed even when the tightening allowance of the shrinkage is small or not. In a closed container having a cylindrical shell shell. A method of manufacturing a fluid machine that houses a fluid transport mechanism and an electric motor that drives the fluid transport mechanism, and a stator of the motor is inserted into and fixed to the trunk shell, while cooling the stator by cooling means, By performing welding and fixing of the shell shell and the stator through a through hole provided in the shell shell, heat transferred from the shell shell to the stator during welding is absorbed by a cooling means having a cooling gas or a cooling surface. Therefore, it is possible to prevent the temperature of the stator from rising to a dangerous value that damages a heat-sensitive component such as a coating of the winding or an insulating member. In addition, since there is little or no fastening allowance, there is little deformation or distortion of the stator, and performance degradation can be prevented.

  In the third invention, in particular, in the first or second invention, the cooling means has a cooling surface which is inserted into and comes into contact with the inner diameter side of the stator, so that heat conduction is performed from the inner diameter surface which is the largest heat radiating surface of the stator. Since the heat can be directly absorbed by this, the temperature rise of the stator can be suppressed and damage to the coating of the winding and the insulating member can be prevented.

  According to a fourth aspect of the invention, in particular, the cooling means in the first to third aspects has a cooling gas supply means in the vicinity of the stator, so that the cooling gas directly hits the coating of the winding or the insulating member, and the surfaces thereof. Since heat can be absorbed directly by heat transfer, damage to the coating of the winding and the insulating member can be prevented.

  The fifth invention is particularly the case where the refrigerant compressed in the first to fourth inventions is carbon dioxide. In this case, since the inside of the sealed container becomes a high pressure during operation, the pressure resistance, joining and fixing of each member are particularly high. Although a sealed container or member having high strength is required, the present invention can provide a sealed container with high pressure resistance without damaging internal components.

  According to a sixth aspect of the present invention, a compression mechanism and an electric motor for driving the compression mechanism are housed in a sealed container having a cylindrical shell shell, and a stator of the motor is inserted into the shell shell, and a through hole provided in the shell shell The stator is welded and fixed to the shell shell via a screw, and can be fixed even if the tightening allowance between the shell shell and the stator is small or not. Can prevent deformation and distortion.

  In the seventh invention, in particular, in the sixth invention, the inner diameter of the through-hole is made smaller than the plate thickness of the shell shell, so that the heat flow to the stator is reduced when the stator is welded to the shell shell. Therefore, even if there is no cooling means, the temperature rise of the stator during welding can be suppressed, and damage to the coating of the winding and the insulating member can be prevented.

  The eighth invention is particularly the case where the refrigerant compressed in the fifth to sixth inventions is carbon dioxide. In this case, since the inside of the sealed container becomes a high pressure during operation, the pressure resistance, joining and fixing of each member are particularly high. Although a sealed container or member having high strength is required, the present invention can provide a fluid machine that can withstand high pressure without damaging internal components.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by embodiment described below.

(Embodiment 1)
FIG. 1 is a view showing a manufacturing method of a hermetic compressor that is a fluid machine according to a first embodiment of the present invention, and shows a longitudinal section of a shell and a stator. In FIG. 1, a cooling device 21 as a cooling means includes a cooler 22, an installation portion 23a, a support portion 23b, and a cooling surface 23c. The cooling surface 23c is inserted into the inner diameter surface of the stator 6 and the lower end surface is formed. The stator 6 is supported by the support portion 23b and fixed by being brought into contact with the cooling surface 23c from the inner diameter side to be cooled. A separately heated body shell is inserted into the stator 6 fixed in the cooled state and inserted.

  When the shell shell 4 is inserted into the stator 6, heat from the shell shell 4 flows into the stator 6. However, since the stator 6 is cooled by the cooling surface 23c, the temperature rise is suppressed. By suppressing the temperature rise of the stator 6, it is possible to prevent the coating of the winding 7 that is weak against heat and the insulation member 8 from being damaged.

  At this time, in the hermetic compressor for compressing the carbon dioxide refrigerant, since the inside of the hermetic container becomes a high pressure, the shell 4 has an iron plate (that is, has a heat capacity larger than that of the ordinary compressor for compressing the fluorocarbon refrigerant). It is necessary to prevent a great amount of heat from flowing into the stator 6 when the shell 4 and the stator 6 are shrinked. In the case of the above configuration, the heat can be absorbed sufficiently. Thus, the stator 6 can be cooled. Fixing the shrinkage of the stator 6 to the shell 4 can be completed without causing thermal damage to the coating 17 of the winding 7.

(Embodiment 2)
FIG. 2 is a view showing a manufacturing method of the hermetic compressor according to the second embodiment of the present invention, and shows a longitudinal section of a shell and a stator. FIG. 3 is a cross-sectional view of the shell and the stator of the hermetic compressor. 2 is different from the first embodiment (see FIG. 1) in that a cooling gas is used for the stator 6 cooling means.

  In FIG. 2, a cooling device 31 as a cooling means includes a gas supply device 32, an installation portion 33a, a support portion 33b, and an inner diameter support portion 33c. The inner diameter surface of the stator 6 is inserted into the inner diameter support portion 33c. The lower end surface is supported by the support portion 33b. The cooling gas (for example, nitrogen) supplied from the gas supply device 32 passes through the first gas passage provided in the installation portion 33a, and the second gas passage 35 provided in the support portion 33b and the inner diameter support portion 33c. It flows out in the direction of arrows 34a and 35a, respectively.

  The cooling gas in the first gas passage cools the upper and lower ends of the winding (see winding 7 in FIG. 3), and the notch 10 on the outer peripheral portion of the stator 6 shown in FIG. 2 flows upward from the lower side of FIG. 2 to cool the stator 6, the winding 7 and the insulating member 8, and suppress the temperature rise thereof.

  The cooling gas in the second gas passage is discharged from the center toward the outside in the direction of the arrow 35a shown in FIGS. 2 and 3, cools the winding 7 and is centered in the direction of the arrow 35b from the notch of the slot 9. The coil 7 and the insulating member 8 inside the slot 9 are cooled.

  Therefore, according to the above embodiment, when the heated shell 4 is inserted into the stator 6, the heat from the shell 4 flows into the stator 6, but the first and second gas passages are cooled. The gas (arrows 34a and 35b) directly cools the winding 7 and the insulating member 8 of the stator 6, so that the coating of the winding 7 that is vulnerable to heat and the temperature rise of the insulating member 8 are suppressed, and damage to them. Can be prevented.

  In the above embodiment, the gas cooled by the cooling device is used. However, the present invention is not limited to this, and a normal temperature gas may be used, and the cooling action can be obtained by increasing the gas flow rate. Nitrogen gas is used as the cooling gas. However, the present invention is not limited to this, and an inert gas or nonflammable gas such as air, argon, helium or carbon dioxide may be used.

In addition, by carrying out the first embodiment together with the above example, the stator 6 can be more reliably
The winding 7 and the insulating member 8 can be cooled.

(Embodiment 3)
FIG. 4 is a cross-sectional view of a hermetic compressor according to the third embodiment of the present invention.

  The difference from the first and second embodiments (see FIGS. 1 to 3) is that the stator 6 is fixed by welding (plug welding) through a through hole 41 provided in the shell 4. The cooling means shown in FIG. 1 or 2 is used for cooling the stator 6.

  FIG. 4 is a view showing a state in which the stator 6 is inserted into the shell shell 4 and is fixed by a plug welded portion 41a welded by a through hole 41. The stator 6 has an outer periphery without the notch 10. The surface is fixed to the shell shell 4 by a plug welded portion 41a of the through hole 41.

  When the plug welded portion 41a is formed, heat at the time of welding flows from the plug welded portion 41a to the stator 6. By using the cooling means shown in FIG. 1 or 2, the stator 6, the winding 7, The rise in temperature of the insulator 8 or the like is suppressed, and damage to them can be prevented. Therefore, since the inner diameter and outer diameter of the shell 4 and the stator 6 can be fixed with the same or lower accuracy than the conventional one, the cost can be reduced.

  Further, the amount of heat given to the shell 4 is smaller in the plug welding of the present embodiment than in the case of the shrinkage fixing of the first and second embodiments, and the time required for cooling is also shortened. Can also be improved.

  Needless to say, the fixing by plug welding of the present embodiment and the shrinkage fixing of the first and second embodiments may be used in combination.

  Furthermore, as shown in FIG. 4, the heat quantity of the welded portion 41 a can be reduced by reducing the inner diameter d of the through hole 41. In particular, by making the inner diameter d smaller than the plate thickness t of the shell 4, the cooling devices 21 and 31 (the cooler 22 and the gas) of the first and second embodiments (see FIGS. 1 and 2) of the welded portion. Even if the supply device 32) is not used, the heat flowing to the stator 6 can be reduced and the covering of the winding 7 and the temperature rise of the insulating member 8 can be suppressed. For example, when t is about 6 to 8 mm, d is about 3 to 5 mm, and plug welding is performed at three locations. Therefore, it is possible to provide a hermetic compressor that ensures reliability and high productivity at a low cost.

  In addition, as the inner diameter d is reduced (for example, when t is about 6 to 8 mm and d is about 3 mm or less), the fixing strength decreases. In this case, the welding can be fixed by increasing the number of welded portions of the plug welded portion 41a. Necessary strength can be secured.

  In the first to third embodiments, the hermetic compressor has been described as an example. However, the present invention relates to a fluid machine having a built-in electric motor, such as a pump that handles high-pressure working fluid such as high-pressure liquid, and the like. Needless to say, the present invention can also be applied to uses such as manufacturing.

  Furthermore, it goes without saying that the present invention can be applied to the manufacture of a fluid machine in which a stator having a heat-sensitive portion such as a winding covering or an insulating member is fixed to a thick shell shell.

As described above, the method of manufacturing a fluid machine according to the present invention makes it possible to securely shrink or weld and fix the stator to the shell while suppressing the temperature of the stator. Not only a hermetic compressor that requires a thick pressure-resistant airtight container like a machine and its manufacturing method, but also a fluid machine that incorporates and fixes an electric motor, such as a pump that handles high-pressure working fluid, and its manufacturing It can also be applied to other uses.

The figure which shows the manufacturing method of the hermetic compressor in the 1st Embodiment of this invention. The figure which shows the manufacturing method of the hermetic compressor in the 2nd Embodiment of this invention. The figure which shows the manufacturing method of the hermetic compressor in the 2nd Embodiment of this invention. Cross-sectional view of a hermetic compressor according to a fourth embodiment of the present invention Vertical section of a conventional hermetic compressor Cross-sectional view of a conventional hermetic compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 3 Compression mechanism 4 Body shell 5a Upper shell 5b Lower shell 6 Stator 7 Winding 8 Insulation member 9 Slot 10 Notch 21, 31 Cooling device (cooling means)
22 Cooling machine 23c Cooling surface 32 Gas supply device 34 First gas passage 35 Second gas passage

Claims (8)

A fluid machine manufacturing method in which a fluid transport mechanism and an electric motor for driving the same are housed in a container having a cylindrical shell shell, and a stator of the motor is inserted and fixed in the shell shell. A method of manufacturing a fluid machine, wherein after the shell is heated, the trunk shell and the stator are fixed by shrinkage while the stator is cooled by a cooling means. A fluid machine manufacturing method in which a fluid conveyance mechanism and an electric motor that drives the fluid conveyance mechanism are housed in a sealed container having a cylindrical shell, and a stator of the motor is inserted into and fixed to the shell. A method for manufacturing a fluid machine, wherein the stator shell and the stator are welded and fixed through a through hole provided in the trunk shell while the stator is cooled by a cooling means. The method of manufacturing a fluid machine according to claim 1, wherein the cooling means has a cooling surface inserted into and in contact with the inner diameter side of the stator. The method of manufacturing a fluid machine according to claim 1, wherein the cooling means has a cooling gas supply means in the vicinity of the stator. The method for manufacturing a fluid machine according to claim 1, wherein the refrigerant to be compressed is carbon dioxide. A compression mechanism and an electric motor that drives the compression mechanism are housed in a sealed container having a cylindrical shell shell, and a stator of the motor is inserted into the shell shell, and the barrel is inserted through a through hole provided in the shell shell. A fluid machine in which the stator is fixed to a shell by welding. The fluid machine according to claim 6, wherein an inner diameter of the through hole is made smaller than a plate thickness of the shell. The fluid machine according to claim 6 or 7, wherein the refrigerant to be compressed is carbon dioxide.

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