JP2003254244A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor easy to be handled in an assembling process and easy to be assembled and adjusted. <P>SOLUTION: A casing is divided into three, a stator 11 is mounted on a front case 3, a compressor part 20 made as a subassembly in advance is mounted on a center case 4, and a rotor 16 is fixed to an extension part 28 of a rotary shaft extending from the compressor part 20. Subsequently, the front case 3, the center case 4 and a rear case 5 are successively connected, and thereby the rotor 16 is aligned to the stator 11 to constitute a motor. Since main parts is assembled as divided parts in a separate process and the compressor part 20 is be assembled as the subassembly, high assembling accuracy is obtained in shaft center aligning of the rotary shaft. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electric compressor in which a compressor section and a motor for driving the compressor section are housed in a casing.

[0002]

2. Description of the Related Art An electric compressor is constructed such that a compressor is connected to a motor through a driving force transmission section and the driving force of the motor drives the compressor to rotate to compress fluid. The force transmission unit and the compressor unit are housed in the casing to form one unit. As such an electric compressor, there is one in which a motor, a driving force transmitting portion and a compressor portion are housed in a casing of a single member. In this case, the motor, the driving force transmitting portion and the compressor portion are manufactured. In a state in which most of them have been assembled, the step of inserting into the casing and fixing to the casing by shrink fitting or welding is adopted. However, since this is after assembling most of the main parts, it becomes bulky and bulky,
There is a problem that it causes difficulty in handling in the work process.

Therefore, for example, in Japanese Patent No. 3078369, a container (casing) is provided with a first container part for supporting a compressor part, a second container part for supporting a driving force transmitting part, and a motor. An electric compressor has been proposed which is composed of a supporting third container part. According to this, since the casing is divided into three parts, each component is preliminarily fixed to each container component in an assembled state, and the assembled components can be assembled together to form the entire compressor, The weight of the object to be handled in the work process becomes light,
It will be petite.

[0004]

However, in the one proposed in the above-mentioned Japanese Patent No. 3078369, the compressor part and the driving force transmitting part are supported and fixed to separate container parts, so that they are connected to each other at the final stage. When doing so, it is necessary to align the rotary shaft of the compressor with the axial center of the driving force transmitting portion. However, since the compressor and the driving force transmitting portion are fixed to separate container parts in advance, there is a problem that it is actually difficult to perform highly accurate assembly and adjustment. Therefore, an object of the present invention is to provide an electric compressor which is easy to handle in the assembling process and is easy to assemble and adjust.

[0005]

Therefore, the invention of claim 1 is an electric compressor in which a compressor section is driven by a motor, and is a separate first case that is axially divided. And a second case, a stator is attached to the first case, a compressor unit including a rotating member having a rotating shaft and a fixed member is attached to the second case, and the rotating shaft is the first Has an extension portion extending toward the case side, the rotor is coupled to the extension portion, the first case and the second case are connected to align the rotor with the stator, and the stator and the rotor allow the motor to move. Was configured.

According to a second aspect of the invention, the first case is provided with a shaft support portion for supporting the tip of the extension portion.

According to a third aspect of the present invention, the first case has a bottomed tubular shape that opens toward the second case side, and the second case has a tubular shape that opens at both ends and is connected to each other. Of the spaces formed in the first case and the second case, the space on the first case side of the compressor section serves as a fluid suction chamber. According to a fourth aspect of the invention, the shaft support portion is a bearing provided on the bottom wall of the first case.

According to a fifth aspect of the present invention, a third case having a bottomed cylindrical shape having an opening on the second case side is connected to the side opposite to the first case of the second case, and the third case is connected. The space formed therein serves as a discharge chamber for the fluid compressed by the compressor section. In the invention of claim 6, lubricating oil is stored in the discharge chamber, and the fixing member of the compressor section is provided with an oil passage for guiding the lubricating oil to a support section that supports the rotating shaft.

According to a seventh aspect of the present invention, there is provided a method of manufacturing an electric compressor, in which a stator is attached to a first case, and a compressor section including a rotary member having a rotary shaft having an extension and a fixed member is previously provided. Assembled into a subassembly, this subassembly is attached to the second case, the rotor is fixed to the extension of the rotary shaft before or after the subassembly is attached to the second case, and then the first case and the By connecting the two cases to each other, the rotor is aligned with the stator to form the motor.

[0010]

1 is a longitudinal sectional view showing an embodiment of the present invention applied to refrigerant compression. The casing 2 of the electric compressor 1 is composed of a front case 3, a center case 4 and a rear case 5. The front case 3 has a bottomed tubular shape, and the coil 1 is provided on the opening side thereof.
A stator 11 with 2 is attached. A connector 14 of a cable 13 extending from the coil 12 is airtightly attached to a side wall on the bottom side of the front case 3,
Power is supplied from the outside.

A step portion 6 is formed on the inner peripheral wall of the front case 3, the front end of the stator 11 is positioned in contact with the step portion 6, and the rear end of the stator 11 is substantially the same as the opening end surface of the front case 3. Match. The coil 12 projects from the open end surface of the front case 3 and faces the center case 4. A refrigerant suction port (not shown) is also provided on the side wall of the front case 3 on the bottom side so that the refrigerant can be sucked from the outside.

The center case 4 has a tubular shape with openings at both ends, and a mounting block 8 for mounting the compressor section 20 is formed in the central portion in the axial direction thereof. In the compressor unit 20, a rotor 25 including a plurality of vanes 26 is rotatably provided in a cylinder 21 having an elliptical inner peripheral surface, and the cylinder 21 is provided with a front side block 30 and a rear side block 40.
Sandwiched between them to form a vane rotary compressor. The rotor 25 has its rotation shaft 27 supported by the support hole 41 of the rear side block 40 on the rear side and by the support hole 31 of the front side block 30 on the front side.

Cylinder 21 and front side block 3
The position 0 of the rotor 2 is defined by the positioning pin 34 inserted between the pin holes 23 and 33 provided in both of them, and the rotor 2 is positioned with respect to the center of the cylinder 21.
The rotary shafts 27 of 5 are aligned. In this state, the front side block 30, the cylinder 21, and the rear side block 40 are integrally connected by a bolt 45, as shown in FIG. 2 having a cross section different from FIG.

Further, as shown in FIG. 1, the front side block 30, the cylinder 21 and the rear side block 40 are fixed to the mounting block 8 by bolts 47 penetrating them. A suction port 36 is opened in the front side block 30, and the rear side block 40 is
Cyclone block 48 with oil separator 49
Is attached.

The rotating shaft 27 of the rotor 25 has an extension portion 28 that extends through the support hole 31 into the front case 3, and the tip of the extension portion 28 is supported by a bearing 15 provided on the bottom wall of the front case 3. Has been done. The rotor 16 aligned with the stator 11 in the axial direction is fixed to the extension 28 of the rotating shaft 27. As a result, the stator 1
The motor 10 is formed by 1 and the rotor 16.

It should be noted that the space in which the refrigerant suction port on the bottom side of the front case 3 is provided and the space in front of the front side block 30 mounted on the mounting block 8 of the center case 4 sandwich the motor 10 and the refrigerant. The suction chamber 50 is formed, and the side wall of the front case 3 is provided with a communication passage 54 connecting the front and rear spaces of the stator 11.

A central portion of the rear side block 40 and a cyclone block 48 attached to the rear side block 40 project from the rear end surface of the center case 4. Rear case 5
Has a bottomed cylindrical shape and accommodates the cyclone block 48 and the like protruding from the rear end surface of the center case 4 and forms a discharge chamber 52. A refrigerant discharge port 9 is provided on the side wall of the rear case 5, and the refrigerant discharged from the compressor section 20 via the oil separator 49 is supplied from the refrigerant discharge port 9 to the outside.

A predetermined amount of lubricating oil is stored in the discharge chamber 52. As shown in FIG. 2, the rear side block 40 is formed with an oil passage 42 that opens to the bottom of the discharge chamber 52 and reaches the hole surface of the support hole 41, and the surface of the rear side block 40 facing the rotor 25 is formed. A recess 44 is provided so as to communicate with the back pressure chamber 58 of the vane groove 56 that supports the vane 26 of the rotor 25.

A closed space R between the cyclone block 48 and the rear side block 40 and the recess 44 are connected by a communication passage 43. Pressed by the discharge pressure of the discharge chamber 52,
The lubricating oil that has reached the hole surface of the support hole 41 through the oil passage 42 flows through the gap between the support hole 41 and the rotary shaft 27 into the recess 44 and the sealed space R.

Further, a through hole 35 connecting to the oil passage 42 of the rear side block 40 is provided at the bottom of the cylinder 21, and the oil passage 3 formed in the front side block 30 is provided.
7, the through hole 35 and the support hole 31 of the rotary shaft 27 in the front side block 30 are connected to each other,
It is designed to guide lubricating oil to 1. In addition, between the front case 3 and the center case 4, and between the center case 4
The connection between the rear case 5 and the rear case 5 is airtightly connected by using a general connecting means for connecting bolts with flange portions (not shown) that are appropriately formed on the opposing end surfaces.

In the present embodiment, the cylinder 21, the front side block 30 and the rear side block 40 of the compressor section 20 correspond to the fixing member in the invention,
The rotor 25 corresponds to a rotating member. Further, the front case 3, the center case 4, and the rear case 5 correspond to the first, second, and third cases, respectively. The oil passage 42, the through hole 35, and the oil passage 37 form an oil passage that guides the lubricating oil.

In the electric compressor 1 thus constructed,
The compressor unit 20 and the motor 10 are housed in the casing 2 and are closed from the outside to form a hermetic electric compressor. When the motor 10 is driven, the rotor 25 of the compressor unit 20 having the common rotating shaft 27 with the rotor 16 rotates, and the refrigerant sucked from the refrigerant suction port receives the refrigerant in the suction chamber 50 and the stator of the motor 10. 11 flows through a gap between the rotor 11 and the rotor 16, is sucked into the cylinder 21 of the compressor unit 20, is compressed and discharged into the discharge chamber 52, and then is supplied from the refrigerant discharge port 9 to the outside. The motor is cooled by the suction refrigerant flowing around the motor.

The electric compressor 1 is assembled in the following procedure. First, in the front case 3 in the separated state, as shown in FIG. 3, an extension 2 of the rotor rotation shaft is attached to the bottom wall.
A bearing 15 for supporting 8 is attached. Further, the stator 11 is attached by shrink fitting or the like at the position where the front end is abutted against the stepped portion 6 of the inner peripheral wall, and the connector 14 is attached to the side wall. In the bearing mounting and the stator mounting, the central portion opening D of the stator 11 is the bearing 1
Since the diameter is larger than 5, the order may be first.

Next, with respect to the center case 4, as shown in FIG. 4, the cylinder 21 and the front side block 30 are superposed by positioning with the positioning pins 34.
The rotor 25 is arranged in the cylinder 21 by passing the rotary shaft 27 through the support portion 31 of the front side block. Then, the rear side block 40 is superposed on the cylinder 21, and the front side block 30, the cylinder 21 and the rear side block 40 are integrally connected by a bolt 45 (see FIG. 2) to assemble the compressor section 20. Then, the rotor 16 is attached and fixed to the extension portion 28 of the rotor 25, and the cyclone block 48 is attached to the rear side block 40 to form a subassembly.

The cyclone block 48 is provided before the rear side block 40 is integrally connected to the cylinder 21 and the front side block 30.
It may be attached in advance. This subassembly is fixed to the mounting block 8 with bolts 47,
Attach to the center case 4.

When the front case 3 with the stator 11 and the like and the center case 4 with the compressor section 20 and the like are prepared as described above, as shown by the arrow A in FIG. The rotor 16 on the extension portion 28 is inserted into the stator 11 from the axial direction, the tip of the extension portion 28 is inserted into the bearing 15, and the front open end of the center case 4 and the open end of the front case 3 are joined together. To do. Further, as shown by an arrow B, the rear case 5 covers the rear open end of the center case 4, and both open ends are combined to cover the cyclone block 48 and the like.

When connecting the cases, a seal ring or a gasket is used to make them airtight. The order of preparation of the front case 3 having the stator 11 or the like attached thereto and preparation of the center case 4 having the compressor unit 20 or the like attached thereto do not matter. In addition, there is no particular limitation on the final order of combining the cases.

The embodiment is configured as described above. The casing 2 is divided into three parts, the stator 11 of the motor 10 is attached to the front case 3, and the compressor portion 20 is assembled in the center case 4 in advance. The rotor 1 of the motor 10 on the rotary shaft 27 (extension 28) of the
6 is attached, and then the front case 3 and the center case 4 and the center case 4 and the rear case 5 are connected to form the electric compressor 1, so that the main parts are the front case 3 and the center case. It is divided into 4 parts and assembled. Therefore, they can be assembled as separate products in separate steps, and handling in the work process is easy.

Then, the compressor section 20 has a positioning pin 34.
Since it is pre-assembled using, high assembly accuracy can be obtained. Further, since the rotor 16 of the motor 10 is directly fixed to the rotary shaft 27 of the rotor 25, the rotary shaft 27 itself also has the function of the conventional driving force transmission unit.
The conventional problem of difficulty in adjusting the axial center between the driving force transmitting section and the compressor section is solved, and a high-precision electric compressor can be obtained without troublesome adjusting work.

In the assembling procedure in the embodiment, the rotor assembly 16 is fixed to the extension 28 of the rotary shaft of the compressor unit 20 and then attached to the center case 4. It is also possible to attach the rotor 16 to the center case 4 and then fix the rotor 16 to the extension 28 of the rotary shaft.

Further, although the vane rotary compressor is shown as the compressor unit, the present invention is not limited to this, and for example, a rolling piston compressor, a scroll compressor or any other compressor can be used as the compressor unit. .

[0032]

As described above, the electric compressor of the present invention is
A first case and a second case which are separate bodies in the axial direction are provided, the stator is attached to the first case, the compressor unit is attached to the second case, and the compressor unit The rotating shaft has an extension portion extending to the first case side, and the rotor is coupled to the extension portion, and the first case and the second case
When the case is connected, the rotor is aligned with the stator, and the stator and the rotor constitute the motor. Therefore, the main parts are divided into the first and second cases, and the steps are separately performed. Can be assembled as a separate item,
This has the effect that handling during the work process is simple. In addition, the compressor section can be assembled as a subassembly before mounting it in the second case,
High assembly accuracy can be obtained for aligning the axis of the rotating shaft.

Further, by providing the shaft support portion for supporting the tip of the extension portion in the first case, the rotary shaft to which the rotor is fixed is reliably supported, and the support accuracy of the rotor is improved.

The first case has a cylindrical shape with a bottom, and a space formed in the first case and the second case connected to each other on the side closer to the first case than the compressor section is the suction chamber. By doing so, the space is effectively utilized and the motor is efficiently cooled by the intake fluid. Further, by using the bottom wall of the first case, a bearing can be provided as a shaft support portion that supports the tip of the extension portion.

By connecting a third case having a bottomed cylindrical shape to the second case and using a space formed in the third case as a discharge chamber, a hermetic electric compressor is provided. can get. In this case, lubricating oil can be stored in the discharge chamber, and a fixed member of the compressor section is provided with an oil passage that guides the lubricating oil to the support section that supports the rotating shaft, ensuring high durability and smooth operation. To be done.

The method of manufacturing the electric compressor according to the present invention is
While the stator is attached to the first case, the compressor section is made into a subassembly in advance, this subassembly is attached to the second case, and the rotor is fixed to the extension of the rotary shaft. By connecting the case and the second case to each other, the rotor is aligned with the stator to form the motor, so that the main parts are divided into the first and second cases and divided into separate products in different steps. It can be assembled and is easy to handle during the work process. Further, since the compressor section is assembled as a subassembly, high assembly accuracy can be obtained in aligning the axis of the rotary shaft.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a partial view showing a cross section different from FIG.

FIG. 3 is a diagram showing how components are attached to a front case.

FIG. 4 is a view showing a mounting state of parts to a center case.

FIG. 5 is an explanatory diagram showing an assembly procedure at the final stage of manufacturing.

[Explanation of symbols]

1 Electric compressor 2 casing 3 front case 4 center case 5 rear case 6 steps 8 mounting blocks 9 Refrigerant discharge port 10 motors 11 Stator 12 coils 13 cables 14 connector 15 bearings 16 rotor 20 compressor section 21 cylinders 23 and 33 pin holes 25 rotor 26 vanes 27 rotation axis 28 Extension 30 front side blocks 31, 41 Support hole 34 Positioning pin 35 through hole 36 Inlet 37, 42 oil passage 40 Rear side block 43 passages 44 recess 45, 47 volt 48 cyclone block 49 Oil separator 50 Inhalation chamber 52 Discharge chamber 54 communication passage 56 vane groove 58 Back pressure chamber

Claims (7)

[Claims] 1. An electric compressor in which a compressor section is driven by a motor, comprising a first case and a second case that are separate bodies that are divided in the axial direction, and the first case includes The stator is attached, and the second case is attached with a compressor part including a rotating member having a rotating shaft and a fixed member, and the rotating shaft has an extension part extending toward the first case. A rotor is coupled to the portion, a first case and a second case are connected to align the rotor with the stator, and the stator and the rotor constitute the motor. Electric compressor. 2. The electric compressor according to claim 1, wherein the first case is provided with a shaft support portion that supports a tip of the extension portion. 3. The first case has a bottomed tubular shape that opens toward the second case, and the second case has a tubular shape with both ends open, and the first case connected to each other. 3. The electric compressor according to claim 1 or 2, wherein a space of the space formed in the second case, which is closer to the first case than the compressor section is a fluid suction chamber. 4. The electric compressor according to claim 2, wherein the shaft support portion is a bearing provided on the bottom wall of the first case. 5. A bottomed cylindrical third opening on the side of the second case opposite to the side of the first case of the second case.
5. The electric motor according to claim 1, wherein the case is connected, and the space formed in the third case is used as a discharge chamber of the fluid compressed by the compressor unit. Compressor. 6. The lubricating oil is stored in the discharge chamber, and the fixing member of the compressor section is provided with an oil passage for guiding the lubricating oil to a support section that supports the rotating shaft. The electric compressor according to item 5. 7. A compressor assembly comprising a rotating member having a rotating shaft having an extension and a fixed member is previously assembled into a first case to form a sub-assembly, and the second case is provided with the sub-assembly. Attached
Before or after attaching the subassembly to the second case, the rotor is fixed to the extension part of the rotation shaft, and then the first case and the second case are connected to each other, thereby A method of manufacturing an electric compressor, characterized in that a motor is configured by being aligned with the stator.