JP3553145B2 - 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]
Conventionally, this type of hermetic compressor has a drive shaft 3 in a hermetically sealed case 1 as shown in FIG. 3, a compressor section 2 at one end of the drive shaft 3, and a drive shaft 3 at the other end of the drive shaft 3. Is provided with an electric motor 405.
[0003]
The compressor unit 2 includes a bearing 205 for supporting the drive shaft 3, the drive shaft 3 is rotatably supported by the bearing 205, and the electric motor 405 includes a rotor 405 a and a stator 405 b, The rotor 405a is provided integrally with the outer peripheral surface of the drive shaft 3, and the stator 405b is provided to face the rotor 405a with a small gap.
[0004]
In such a hermetic compressor, when the electric motor 405 is started, the drive shaft 3 rotates, and the rotation causes the compressor section 2 to compress the refrigerant gas. At this time, the compressed low-pressure refrigerant gas is introduced from the suction port 1a side of the closed case 1, and the compressed high-pressure refrigerant gas is discharged to the discharge port 1b side of the closed case 1.
[0005]
Incidentally, this type of hermetic compressor is generally of a so-called cantilever support structure in which the drive shaft 3 is supported only by the bearing 205 of the compressor section 2 as described above. The drive shaft 3 has a so-called double-sided support structure without adopting the double-sided support structure. The structure of the both-ends support is described in JP-A-61-229988 or JP-A-3-217785. I have.
[0006]
FIG. 4 shows an example in which the drive shaft 3 has a double-supported structure. That is, in the hermetic compressor shown in the figure, one end of the drive shaft 3 is supported by a bearing 205 of the compressor unit 2 and the other end of the drive shaft 3 is supported by another bearing 206. Both ends of the drive shaft 3 are supported by bearings 205 and 206.
[0007]
[Problems to be solved by the invention]
However, in the conventional structure in which the drive shaft 3 is cantilevered (see FIG. 3), when the drive shaft 3 rotates at a high speed, the whirling of the drive shaft 3 occurs due to the weight of the rotor 405a and its mounted state, and the like. As a result, there are problems such as generation of vibration and noise, and an excessive load applied to the bearing 205.
[0008]
In particular, from the viewpoint of rotating the drive shaft 3 at a higher speed and thereby increasing the amount of compression of the refrigerant gas, when a large output type motor is applied, both the size and the weight of the rotor 405a increase. Therefore, the whirling of the drive shaft 3 and the resulting vibration, noise, and load applied to the bearing are further increased, and the operation state becomes unstable.
[0009]
On the other hand, in the conventional structure in which the drive shaft is supported at both ends (see FIG. 4), it is necessary to secure the axial center accuracy of the drive shaft 3 and the pair of bearings 205 and 206 required for supporting both ends thereof. There is a problem in that it is difficult to manufacture, as compared with a cantilevered support structure without any.
[0010]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hermetic compressor that is suitable for preventing a problem caused by whirling of a drive shaft and that is easy to manufacture.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has a sealed case, a drive shaft disposed in the sealed case, a bearing rotatably supporting the drive shaft, and a drive shaft. A hermetic compressor including a compressor section for compressing refrigerant gas by rotation, a rotor mounted on the drive shaft, and an electric motor including a stator disposed at a position facing the rotor. Wherein the rotor and the stator are divided and disposed on both ends of the drive shaft, and the periphery of the divided and disposed rotor and the stator is A refrigerant gas introduction path is provided, and the compressor unit is interposed between the pair of side blocks having the bearing of the drive shaft and the pair of side blocks, and the respective side blocks are respectively attached to open ends on both sides. hand And a rotor provided in the cylinder, integrally provided with the drive shaft, and rotated around the drive shaft, and mounted on a vane groove formed on an outer peripheral surface of the rotor. And a vane that moves forward and backward from the outer peripheral surface of the rotor toward the inner wall side of the cylinder, and a communication path provided in the side block, wherein the communication path extends along an axial direction of the drive shaft. And one end thereof is opened so as to face the opening end of the cylinder, and the other end thereof communicates with the introduction path .
[0012]
According to a second aspect of the present invention, the rotor and the stator of the electric motor are divided into a first divided rotor and a divided stator, and a second divided rotor and a divided stator. The split stator is provided at one end of the drive shaft, while the second split rotor and the split stator are provided at the other end of the drive shaft.
[0015]
[Action]
According to the present invention, the rotor and the stator of one electric motor provided at the end of the drive shaft are divided and disposed at both ends of the drive shaft. Is applied only to the weight of the divided rotor, the weight load applied to the end of the drive shaft is reduced, and the drive shaft is prevented from whirling due to the weight of the rotor and its mounting state.
[0016]
【Example】
Hereinafter, an embodiment of a hermetic compressor according to the present invention will be described with reference to FIGS.
[0017]
This hermetic compressor has a hermetic case 1 as shown in FIG. 1, in which a compressor section 2 and a drive shaft 3 are arranged.
[0018]
The compressor section 2 is fixed to a support frame section 100 provided substantially near the center inside the closed case 1 and employs the same configuration as a so-called well-known vane rotary type compressor.
[0019]
That is, the compressor unit 2 includes an inner peripheral elliptical cylinder 200 as shown in FIG. 2, side blocks 201 and 202 are attached to both end surfaces of the cylinder 200, and a rotor 203 is provided in the cylinder 200. It is arranged rotatably.
[0020]
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 biasing 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 200 is generated by lubricating oil supplied to the vane groove 203a.
[0021]
In the compressor section 2 having such a configuration, when the rotor 203 rotates, the capacity of the compression working chambers a, a... Partitioned by the cylinder 200, the side blocks 201 and 202, the rotor 203 and the vanes 204, 204. This change in capacity compresses the refrigerant gas.
[0022]
The drive shaft 3 is provided integrally with the axis of the rotor 203, and is formed so as to protrude to both sides of the compressor unit 2 through the through holes 205 of both side blocks 201 and 202. It is provided as a bearing for rotatably supporting the shaft 3.
[0023]
Split motors 4 and 5 are provided at both ends of the drive shaft 3, and one split motor 4 is composed of a first rotor split piece A ₁ and a stator split piece B ₁ , and the other. dividing the motor 5 and a second rotor divided pieces a ₂ and stator divided pieces B _2.
[0024]
The first rotor split piece A ₁ is mounted on the outer peripheral surface on one end side of the drive shaft 3, while the first stator split piece B ₁ is separated from the first rotor split piece A ₁ by a predetermined gap. And is fixed to the closed case 1 side.
[0025]
The second rotor split piece A ₂ is mounted on the outer peripheral surface on the other end side of the drive shaft 3, while the second stator split piece B ₂ has a predetermined gap with the _second rotor split piece A _2. They are arranged to face each other at a distance, and are fixed to the closed case 1 side.
[0026]
Such two divided motors 4 and 5 divide the stator and rotor of one motor provided at the end of the drive shaft into two, that is, the conventional stator is divided into first and second stators. The rotor is divided into divided pieces A ₁ and A ₂ , and the conventional rotor is divided into first and second rotor divided pieces B ₁ and B ₂ . Therefore, the total power of the two split electric motors 4 and 5 is the same as the initial power before the split, and a practically sufficient power can be obtained.
[0027]
The circumference of the first rotor split piece A ₁ and the stator split piece B _{1 and} the circumference of the second rotor split piece A ₂ and the stator split piece B ₂ The inlet passages 6 and 6 are provided so that low-pressure refrigerant gas flows from inlets 1 a and 1 a formed on both sides of the sealed case 1.
[0028]
In order to guide the low-pressure refrigerant gas flowing into the introduction paths 6 and 6 from the suction ports 1 a and 1 a into the cylinder 200 of the compressor section 2, the frame section 100 of the closed case 1 and the side block of the compressor section 2 are arranged. The communication paths 7, 7,... Are provided at 201, 202, and the introduction paths 6, 6 and the inside of the cylinder 200 are provided through these communication paths 7, 7,.
[0029]
Next, the operation of the hermetic compressor configured as described above will be described with reference to FIGS.
[0030]
According to the hermetic compressor, the rotors 203 rotate integrally with the drive shaft 3 by the activation of the split electric motors 4 and 5. When the rotor 203 rotates in this manner, the capacity of the compression working chambers a, a... Changes, and the refrigerant gas is compressed together with the lubricating oil due to the change in capacity.
[0031]
At this time, the low-pressure refrigerant gas before compression passes through the inlets 1a, 1a through the introduction paths 6, 6, and the communication paths 7, 7,... As shown by solid arrows in FIG. Be guided.
[0032]
The compressed high-pressure refrigerant gas passes through the discharge ports 200a, 200a, the discharge valves 200b, 200b of the cylinder 200 and the space between the closed case 1 and the cylinder 200 as indicated by a broken line arrow in the drawing, and It reaches the discharge port 1b provided near the center.
[0033]
Therefore, in the hermetic compressor of the above embodiment, the rotor and the stator of one electric motor provided at the end of the drive shaft are divided and arranged at both ends of the drive shaft. For this reason, only the weight of the divided rotor is applied to the end of the drive shaft, and the weight load applied to the end of the drive shaft is reduced. Shaking of the shaft is suppressed, and vibration, noise, and load applied to the bearings are all reduced, and a stable operating state is obtained.
[0034]
Dividing the rotor and stator of the electric motor at both ends of the drive shaft in this manner is particularly suitable when a high-power electric motor having a heavy rotor is applied, and furthermore, In the case where the power of the electric motor is the same as the conventional one, sufficient rigidity can be obtained even with a drive shaft having a small diameter.
[0035]
Further, since the hermetic type compressor of the above embodiment has a structure in which the drive shaft is cantilevered only by the bearing of the compressor portion, the shaft center accuracy during the manufacturing can be improved as in the case where the drive shaft is supported by the both ends. There is no need to secure it and the production is easy.
[0036]
In the above embodiment, the first rotor split piece A ₁ and the stator split piece B ₁ are provided as the refrigerant gas introduction paths 6 and 6 to the compressor section 2, that is, the split motor 4. , 5 side is configured to be low pressure. Instead, the divided motors 4, 5 side are configured to be high pressure, that is, the first rotor divided piece A ₁ and the stator divided piece B _1. periphery, and a second peripheral portion of the rotor divided piece a ₂ and stator divided pieces B _2, it may be provided as a discharge passage of the refrigerant gas.
[0037]
The first rotor split piece A ₁ and the second rotor split piece A ₂ , and the first stator split piece B ₁ and the second stator split piece B ₂ are used to adjust the weight balance of the drive shaft 3. It is preferable that one rotor and the stator are divided in half from the surface, but the ratio of the division can be appropriately changed as necessary.
[0038]
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.
[0039]
【The invention's effect】
In the hermetic compressor according to the present invention, the rotor and the stator of one electric motor provided at the end of the drive shaft are divided and disposed at both ends of the drive shaft. Only the weight of the divided rotor is applied to the end of the drive shaft, and the weight load applied to the end of the drive shaft is reduced. For this reason, the whirling of the drive shaft due to the weight of the rotor and its mounting state is suppressed, and the vibration, noise, and load applied to the bearing are all reduced, and stable operation of this type of hermetic compressor is achieved. I can do it.
[0040]
In addition, since the hermetic compressor according to the present invention has a structure in which the drive shaft is cantilevered only by the bearing of the compressor section, the shaft center accuracy is ensured at the time of manufacturing as in the case where the drive shaft is supported in a double-ended manner. There is an advantage that it is unnecessary and easy to manufacture.
[0041]
The same effects as described above can be obtained with the inventions according to claims 1 to 3.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of a hermetic compressor according to the present invention.
FIG. 2 is a sectional view taken along line II-II shown in FIG.
FIG. 3 is a sectional view of a conventional hermetic compressor.
FIG. 4 is a sectional view of a conventional hermetic compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sealing case 2 Compressor part 3 Drive shaft 6 Introducing path A ₁ First rotor split piece (first split rotor)
A ₂ Second rotor split piece (second split rotor)
B ₁ First stator split piece (first split stator)
B ₂ Second stator split piece (second split stator)

Claims (2)

A sealed case,
A drive shaft disposed in the closed case,
A compressor section having a bearing for rotatably supporting the drive shaft, and compressing the refrigerant gas by rotation of the drive shaft;
A hermetic compressor comprising: a rotor mounted on the drive shaft; and an electric motor including a stator disposed at a position facing the rotor.
On both ends of the drive shaft, the rotor and the stator are divided and disposed ,
Around the periphery of the rotor and the stator arranged separately, an introduction path of refrigerant gas to the compressor unit is provided,
The compressor unit is
A pair of side blocks having a bearing for the drive shaft,
A cylinder interposed between the pair of side blocks, and a cylinder having each side block attached to an opening end on both sides,
A rotor that is provided in the cylinder, is provided integrally with the drive shaft, and rotates about the drive shaft as an axis;
A vane mounted in a vane groove formed on the outer peripheral surface of the rotor, and moving forward and backward from the outer peripheral surface of the rotor toward the inner wall side of the cylinder;
Having a communication path provided in the side block,
The above connection route is
A closed mold formed along the axial direction of the drive shaft, one end of which is opened so as to face the open end of the cylinder, and the other end of which is connected to the introduction path. Compressor. The rotor and the stator of the electric motor are divided into a first divided rotor and a divided stator, and a second divided rotor and a divided stator, wherein the first divided rotor and the divided stator are connected to one end of a drive shaft. The hermetic compressor according to claim 1, wherein the second split rotor and the split stator are disposed on the other end of the drive shaft while being disposed on the other side.

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