JP3598132B2 - Hermetic compressor - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a hermetic compressor used for a refrigerator or an air conditioner system of a vehicle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, this type of hermetic compressor has a compressor section and an electric motor built in a hermetically sealed case, and operates the compressor section by starting the electric motor to compress refrigerant gas in the compressor section.
[0003]
In such hermetic compressors, as a means for maximizing the performance of the electric motor, a refrigerant gas introduction passage is provided around the periphery of the electric motor, and the electric motor is cooled by the refrigerant gas before compression passing through the introduction passage. The configuration of this type of cooling means is also described in JP-A-4-112990 or JP-A-5-113188.
[0004]
[Problems to be solved by the invention]
However, in the conventional hermetic compressor as described above, since the refrigerant gas flows through the introduction path while being heated by depriving the heat of the motor, the temperature of the refrigerant gas is lower at the downstream of the introduction path than at the upstream. Relatively high is inevitable. For this reason, the cooling of the motor by the refrigerant gas is not sufficiently performed on the downstream side of the introduction path, and the compressor section serving as a heat source is located on the downstream side of the introduction path. In addition, the temperature of the entire electric motor becomes non-uniform, and there are problems such as trouble of the electric motor due to heat, for example, reduction in efficiency and durability, overheating, and the like.
[0005]
Also, in the conventional hermetic compressor, the heat of the discharge chamber, which is high temperature, reaches the motor through the hermetic case, and further increases the temperature of the motor. It is listed as one of the.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly reliable hermetic compressor in which a trouble of an electric motor due to heat is prevented.
[0007]
[Means for Solving the Problems]
Means for Solving the Problems To achieve the above object, the invention according to claim 1 incorporates, in a closed case, a compressor unit for compressing refrigerant gas and a motor for operating the compressor unit, and In a hermetic compressor having a refrigerant gas introduction path in a peripheral portion, a heat insulating material is interposed midway from the compressor section to a motor through a hermetic case.
[0008]
The invention according to claim 2 is characterized in that a heat insulating material is arranged between the compressor section and the electric motor.
[0009]
The invention according to claim 3 is characterized in that a heat insulating material is arranged between the closed case and the electric motor.
[0010]
According to a fourth aspect of the present invention, a compressor portion for compressing the refrigerant gas and a motor for operating the compressor portion are built in the closed case, and a refrigerant gas introduction passage is provided around the motor. Wherein a heat radiating section is provided between the compressor section and the electric motor.
[0011]
According to a fifth aspect of the present invention, a compressor portion for compressing the refrigerant gas and a motor for operating the compressor portion are built in the closed case, and a refrigerant gas introduction passage is provided around the motor. In the hermetic-type compressor provided with the above, the introduction path is provided with a gas flow rate changing portion for allowing the refrigerant gas to pass quickly on the upstream side and for allowing the refrigerant gas to pass slowly on the downstream side.
[0012]
According to a sixth aspect of the present invention, a compressor portion for compressing the refrigerant gas and a motor for operating the compressor portion are incorporated in the closed case, and the power of the motor is transmitted to the compressor portion side. In the hermetic compressor in which a refrigerant gas introduction path is formed in a drive shaft for performing the above operation, a gas for allowing the refrigerant gas to pass quickly on the upstream side and for allowing the refrigerant gas to pass slowly on the downstream side is provided in the introduction path. It is characterized in that a flow velocity changing unit is provided.
[0013]
The invention according to claim 7 is characterized in that a tapered portion is provided inside the introduction path as the gas flow rate changing portion.
[0014]
The invention according to claim 8 is characterized in that a step portion is provided inside the introduction path as the gas flow rate changing portion.
[0015]
[Action]
According to the first to third aspects of the present invention, excess heat transmitted from the compressor section side to the electric motor side via the closed case is blocked by the heat insulating material.
[0016]
According to the fourth aspect of the invention, the heat of the compressor section which is going to move to the motor side via the closed case is released to the outside when passing through the heat radiating section.
[0017]
In the invention according to claims 5 to 8, the flow of the refrigerant gas is slower on the downstream side of the introduction path than on the upstream side, and the cooling efficiency by the refrigerant gas is higher. For this reason, the temperature of the refrigerant gas is relatively high, the cooling by the refrigerant gas is not sufficiently performed, and the portion which has been a problem as compared with the related art as being particularly affected by the heat of the compressor portion, that is, the downstream side of the introduction path of the electric motor is often improved. Can be cooled.
[0018]
【Example】
Hereinafter, an embodiment of a hermetic compressor according to the present invention will be described in detail with reference to FIGS.
[0019]
The hermetic compressor has a hermetic case 1 as shown in FIG. 1, in which a compressor section 2 and an electric motor 3 are disposed.
[0020]
The closed case 1 is composed of a cylindrical central case 100 having both ends open, and side cases 101 and 102 attached to both open end faces of the central case 100, respectively. The inside of the other side case 102 and the center case 100 is provided as a motor room for housing the motor 3.
[0021]
The compressor unit 2 employs the same configuration as a so-called well-known vane rotary type compressor.
[0022]
That is, the compressor section 2 includes an inner peripheral elliptical cylinder 200 as shown in FIG. 2, and side blocks 201 and 202 are attached to both end surfaces of the cylinder 200 (see FIG. 1). , A rotor 203 is rotatably disposed.
[0023]
Are formed in the rotor 203 in the radial direction, and vanes 204, 204 are mounted in the vane grooves 203a, 203a, and the vanes 204, 204,. The cylinder 200 can move forward and backward toward the inner wall of the cylinder 200 and is urged toward the inner wall of the cylinder 200 by a predetermined urging force. This kind of urging force is obtained by the back pressure at the bottom of the vane 204 and the centrifugal force of the rotor 203, and the back pressure at the bottom of the vane 204 is generated by lubricating oil supplied to the vane groove 203a.
[0024]
As shown in FIG. 1, a drive shaft 4 is provided integrally with the axis of the rotor 203, and a part of the drive shaft 4 is rotatably supported by bearings 201a and 202a of the side blocks 201 and 202. .
[0025]
In such a compressor section 2, when the rotor 203 is rotated via the drive shaft 4, the capacity of the compression working chambers a, a ... divided by the cylinder 200, the side blocks 201, 202, the rotor 203, the vanes 204, 204 ... Changes, and the refrigerant gas is compressed by the change in capacity.
[0026]
The electric motor 3 includes a rotor 300 and a stator 301 opposed thereto. The rotor 300 is integrally attached to the outer peripheral surface of the drive shaft 4, while the stator 301 is attached to the sealed case 1 via a mounting bracket or the like. The electric motor 3 can rotate the drive shaft 4 when supplying electric power to the stator 301 side.
[0027]
A refrigerant gas introduction path 5 is formed around the electric motor 3. An upstream side 5 a of the introduction path 5 communicates with a suction port 1 a of the sealed case 1, and a downstream side 5 b of the introduction path 5 is a compressor section. It is provided so as to communicate with the cylinder 200 via an intake chamber d provided between the motor 2 and the electric motor 3 and an intake communication hole 201b of the side block 201.
[0028]
A sheet-like heat insulating material 6 is provided on the way from the compressor section 2 to the electric motor 3 via the closed case 1.
[0029]
The heat insulating material 6 is located in an intake chamber b provided between the compressor unit 2 and the electric motor 3, and is provided so as to be in close contact with the surface of the side block 201 of the compressor unit 2. The part is sandwiched and fixed between the central case 100 and the side case 101. That is, the heat insulating material 6 is provided between the compressor unit 2 and the electric motor 3 through the side case 101 of the closed case 1, the central case 100, and the electric motor 3. It is composed of a second heat insulating material disposed therebetween.
[0030]
In addition, the heat insulating material 6 is provided with an opening 6a for communicating the introduction path 5 side and the communication port 201b side.
[0031]
Next, the operation of the hermetic compressor configured as described above will be described with reference to FIGS.
[0032]
According to this hermetic compressor, when the rotor 203 rotates integrally with the drive shaft 4 by the activation of the electric motor 3, the capacity of the compression working chambers a, a ... changes, and the refrigerant gas is compressed by the change in capacity.
[0033]
Note that the low-pressure refrigerant gas before compression passes through the introduction path 5, the suction chamber b, the opening 6a of the heat insulating material 6, and the communication path 201b from the suction port 1a as shown by the solid arrow in the drawing, and the compression work chamber a, a.
[0034]
The compressed high-pressure refrigerant gas is supplied to the discharge ports 200a, 200a, the discharge valves 200b, 200b of the cylinder 200, the discharge communication holes (not shown) of the side block 202, and the side block 202, as indicated by broken arrows in the figure. The oil is discharged into the discharge chamber c via the oil separator 205 provided at the rear of the discharge port c, and thereafter reaches the discharge port 1b.
[0035]
At this time, the high-pressure refrigerant gas after compression has a high temperature during compression, and raises the temperature of the compressor section 2 and the discharge chamber c side.
[0036]
Then, part of the heat on the compressor section 2 and the discharge chamber c side tends to transfer to the electric motor 3 via the closed case 1, but this heat is blocked by the heat insulating material 6 before being transmitted to the electric motor 3 side. You.
[0037]
As described above, in the hermetic compressor of the present embodiment, the surplus heat transmitted from the compressor section 2 and the discharge chamber c side to the electric motor 3 via the closed case 1 is blocked by the heat insulating material 6. With such a configuration, it is possible to prevent the temperature of the electric motor 3 from rising due to this kind of heat, and to avoid a trouble of the electric motor 3 due to heat, such as a decrease in efficiency and durability, or overheating.
[0038]
In this embodiment, the heat insulating material 6 is arranged at the boundary between the compressor unit 2 and the electric motor 3, but the heat insulating material 6 may be arranged between the closed case 1 and the electric motor 3 as shown in FIG. The heat insulating material 6 is formed in a cylindrical shape, and the stator 301 of the electric motor 3 is housed and installed inside the cylindrical heat insulating material 6.
[0039]
Even if the heat insulating material 6 is arranged in this manner, since the excess heat transmitted from the compressor section 2 and the discharge chamber c side to the electric motor 3 via the closed case 1 is blocked by the heat insulating material 6, It is possible to prevent the temperature of the electric motor 3 from rising due to some kinds of heat, and to avoid trouble of the electric motor 3 due to the heat.
[0040]
FIG. 4 shows another embodiment of the present invention. The basic structure of the hermetic compressor shown in FIG. 4, that is, a compressor section 2 for compressing refrigerant gas in a hermetic case 1 and this compressor Since the electric motor 3 for operating the unit 2 and the provision of the refrigerant gas introduction path 5 around the electric motor 3 are similar to those of the above-described embodiment, the detailed description thereof is omitted.
[0041]
The hermetic compressor shown in FIG. 1 has a recess 7 formed in a part of the sealed case 1 as a heat radiating portion, and the recess 7 is provided between the compressor section 2 and the electric motor 3, and the hermetic seal is provided therebetween. This is to increase the surface area of the case 1 and improve the heat exchange rate with the outside world.
[0042]
According to the hermetic-type compressor having such a configuration, the heat of the compressor portion 2 and the discharge chamber c which is going to move to the electric motor 3 side through the hermetic case 1 is released to the outside when passing through the hollow portion 7. . For this reason, the heat finally reaching the motor 3 side is reduced as much as possible, and it is possible to prevent the temperature rise of the motor 3 and the trouble of the motor 3 due to this kind of heat.
[0043]
FIG. 5 shows another embodiment of the present invention. Since the basic structure of the hermetic compressor shown in FIG. 5 is the same as that of the above embodiment, detailed description thereof will be omitted.
[0044]
The hermetic compressor shown in the figure has a tapered portion 8 in the introduction passage 5 as a gas flow rate changing portion, and the tapered portion 8 is formed so as to gradually expand from the upstream side 5a of the introduction passage 5 toward the downstream side 5b. Due to the tapered portion 7, the refrigerant gas in the introduction path 5 is set to flow faster on the upstream side 5a and flow slowly on the downstream side 5b.
[0045]
According to the hermetic compressor having such a configuration, the flow of the refrigerant gas is slower on the downstream side 5b of the introduction path 5 than on the upstream side 5a, and the cooling efficiency by the refrigerant gas is higher. In particular, it is possible to cool the portion particularly affected by the above, that is, the downstream side of the introduction path of the motor 3, to make the temperature of the motor 3 uniform, and to prevent trouble of the motor 3 due to heat. it can.
[0046]
In the present embodiment, the tapered portion 8 is provided as the gas flow rate changing portion. However, instead of the tapered portion 8, steps 9 as shown in FIG. 6 may be provided. The downstream side 5b of the introduction path 5 is formed so as to have a larger diameter than the upstream side 5a with the parts 9, 9 as boundaries.
[0047]
When the steps 9 and 9 are formed in this manner, the refrigerant gas in the introduction path 5 is set so as to flow faster on the upstream side 5a and flow slowly on the downstream side 5b, similarly to the case of the taper section 8, so that the taper section The same effect as in the case where 8 is provided can be obtained.
[0048]
FIG. 7 shows another embodiment of the present invention. In the hermetic compressor shown in FIG. 7, an introduction path 5 as shown in FIG. A tapered portion 8 is provided as a gas flow rate changing portion.
[0049]
The tapered portion 8 of the present embodiment is also formed so as to gradually expand from the upstream side 5a to the downstream side 5b of the introduction path 5 similarly to the above-described embodiment, so that the refrigerant gas in the introduction path 5 is It is set to flow fast and to flow slowly on the downstream side 5b.
[0050]
Since the compressor unit 2 for compressing the refrigerant gas and the electric motor 3 for operating the compressor unit 2 are incorporated in the closed case 1 as in the above embodiment, Detailed description is omitted.
[0051]
Also in the hermetic compressor having such a configuration, the flow of the refrigerant gas is slower on the downstream side 5b of the introduction path 5 than on the upstream side 5a, and the cooling efficiency by the refrigerant gas is higher. For this reason, the temperature of the refrigerant gas is relatively high, the cooling by the refrigerant gas is not sufficiently performed, and the portion which has been a problem as compared with the related art as being particularly affected by the heat of the compressor portion, that is, the downstream side of the introduction path of the electric motor is often improved. The motor 3 can be cooled, the temperature of the electric motor 3 can be made uniform, and trouble of the electric motor 3 due to heat can be prevented.
[0052]
In this embodiment, the tapered portion 8 is provided as the gas flow speed changing portion. However, instead of this, the steps 9 and 9 as shown in FIG. .
[0053]
In each of the above embodiments, one of the heat insulating material 6 and the gas flow rate changing unit is provided. However, both the heat insulating material 6 and the gas flow rate changing unit may be provided in the hermetic compressor. Of course.
[0054]
In the above embodiment, the compressor unit 2 is configured as a vane rotary type compressor, but various types of compressors such as a rolling piston type can be applied to the compressor unit 2.
[0055]
【The invention's effect】
According to the first to third aspects of the present invention, since the excess heat transmitted from the compressor section side to the electric motor side via the sealed case is blocked by the heat insulating material, this kind of the invention is provided. A rise in the temperature of the motor due to heat can be prevented, and troubles in the motor due to heat, such as a reduction in efficiency and durability, or overheating can be avoided.
[0056]
According to the fourth aspect of the present invention, since the heat radiating section is provided between the compressor section and the electric motor, heat of the compressor section which is going to move to the electric motor side through the closed case passes through the heat radiating section. At this time, since the heat released to the outside and finally reaching the motor side is reduced as much as possible, it is possible to prevent the temperature rise of the motor and the trouble of the motor due to this kind of heat.
[0057]
According to the invention of claims 5 to 8, the flow of the refrigerant gas is slower on the downstream side of the introduction path than on the upstream side, and the cooling efficiency by the refrigerant gas is higher. For this reason, the temperature of the refrigerant gas is relatively high, the cooling by the refrigerant gas is not sufficiently performed, and the portion which has been a problem as compared with the related art as being particularly affected by the heat of the compressor portion, that is, the downstream side of the introduction path of the electric motor is often improved. The motor can be cooled, the temperature of the motor can be made uniform, and trouble of the motor due to heat can be prevented.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II shown in FIG.
FIG. 3 is a sectional view showing a main part of another embodiment of the present invention.
FIG. 4 is a sectional view showing a main part of another embodiment of the present invention.
FIG. 5 is a sectional view showing a main part of another embodiment of the present invention.
FIG. 6 is a sectional view showing a main part of another embodiment of the present invention.
FIG. 7 is a sectional view showing a main part of another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sealing case 2 Compressor part 3 Electric motor 4 Drive shaft 5 Introductory path 6 Insulation material 7 Depression part (radiation part)
8 Tapered part (gas flow rate changing part)
9 steps (gas flow rate changing part)

Claims (8)

In a hermetic case, a compressor part for compressing the refrigerant gas and a motor for operating the compressor part are built in, and a hermetic compressor having a refrigerant gas introduction path around the motor. ,
A hermetic compressor characterized in that a heat insulating material is interposed from the compressor section to a motor through a hermetic case. The hermetic compressor according to claim 1, wherein a second heat insulating material is further disposed between the compressor section and the electric motor. 2. The hermetic compressor according to claim 1, wherein a heat insulating material is disposed between the hermetic case and the electric motor. In a hermetic case, a compressor part for compressing the refrigerant gas and a motor for operating the compressor part are built in, and a hermetic compressor having a refrigerant gas introduction path around the motor. ,
A hermetic compressor, wherein a heat radiator is provided between the compressor section and the electric motor. In a hermetic case, a compressor part for compressing the refrigerant gas and a motor for operating the compressor part are built in, and a hermetic compressor having a refrigerant gas introduction path around the motor. ,
A hermetic compressor characterized in that a gas flow rate changing section is provided in the introduction path for allowing the refrigerant gas to pass quickly on the upstream side and for allowing the refrigerant gas to pass slowly on the downstream side. In a closed case, a compressor part for compressing the refrigerant gas and a motor for operating the compressor part are built in, and a drive shaft for transmitting the power of the motor to the compressor part side is provided. In a hermetic compressor that has formed a refrigerant gas introduction path,
A hermetic compressor characterized in that a gas flow rate changing section is provided in the introduction path for allowing the refrigerant gas to pass quickly on the upstream side and for allowing the refrigerant gas to pass slowly on the downstream side. 7. The hermetic compressor according to claim 5, wherein a tapered portion is provided inside the introduction path as the gas flow rate changing portion. The hermetic compressor according to any one of claims 5 to 7, wherein a step portion is provided inside the introduction path as the gas flow rate changing portion.

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