KR102163924B1 - Electric Compressor - Google Patents

Abstract

The present invention relates to an electric compressor. The present invention relates to a main housing having an internal space, a motor provided in the main housing and having a stator and a rotor, a shaft coupled to the rotor, a seating portion located on one side of the shaft and having a diameter smaller than that of the shaft, and the seating portion A sub-ball bearing that is slidably assembled, a hollow portion and a hole provided in the seating portion, a locking portion protruding through the hole, and a support portion connected to the locking portion and received in the hollow portion, and a fixing clasp having its own elastic force. Provides an electric compressor.

Description

Electric Compressor

The present invention relates to an electric compressor, and more particularly, to an electric compressor capable of preventing a crankshaft of a motor from moving in a transverse direction due to vibration.

An electric compressor is a device that compresses a fluid such as a refrigerant using electric energy. An example of an electric compressor is a scroll type compressor. The scroll type compressor can obtain a relatively high compression ratio compared to other types of compressors. In addition, in the scroll type compressor, the fluid suction, compression, and discharge processes are smoothly connected to obtain a stable torque. Therefore, scroll type compressors are widely used for refrigerant compression in air conditioners.

The scroll type compressor may include a motor part and a scroll part as a compression mechanism. In addition, an inverter part for controlling the motor part may be included. The motor part includes a stator and a rotor, and the scroll part includes a fixed scroll and a revolving scroll.

A crankshaft (hereinafter referred to as'shaft') is coupled to the rotor of the motor and drives the orbiting scroll through the shaft. The orbiting scroll is meshed with the fixed scroll and compresses fluid such as refrigerant while performing orbiting motion. Since the shaft is a rotating part, it is supported by bearings to reduce frictional resistance. Ball bearings and/or journal bearings can be used as bearings.

Meanwhile, when the compressor is started or operated, vibrations in the transverse direction (horizontal direction) may occur in the compressor. The shaft of the compressor may move in the transverse direction by this transverse vibration. However, if the shaft of the compressor moves in the transverse direction, the shaft may move in the transverse direction and collide with surrounding parts, causing damage. Therefore, it is necessary to prevent the shaft from moving in the lateral direction when starting or operating the compressor. In particular, in the case of a compressor for a vehicle, since vibration occurs during operation of the vehicle, the lateral movement of the shaft must be prevented.

A method of preventing the transverse movement of the shaft in a conventional compressor will be described as follows.

As disclosed in US 8202071 and the like, there is a method of preventing the shaft from moving in the transverse direction by pressing the shaft of the compressor into the main ball bearing. In this structure, the outer ring of the main ball bearing is pressed into the main frame, and the inner ring of the main ball bearing is pressed into the shaft. In this structure, since the shaft is pressed into the main ball bearing, the transverse movement of the shaft is restricted by the main ball bearing. Therefore, even if a lateral vibration occurs in the compressor, the shaft does not move in the lateral direction.

On the other hand, there is a structure in which a journal bearing is used as a main bearing and a sub ball bearing is used on the opposite side of the journal bearing (hereinafter, a'sub ball bearing structure' for convenience). In the sub-ball bearing structure, the lateral movement of the shaft is not restricted. The reason for this is as follows.

Journal bearings do not press-fit the shaft due to their structure. In addition, during the assembly process of the compressor, the shaft is slidingly coupled to the inner ring of the sub ball bearing without being pressed. Therefore, in the journal bearing and the sub ball bearing, the shaft is assembled with a predetermined tolerance, so that the lateral movement of the shaft is not restricted.

As described above, in the compressor of the sub-ball bearing type, there is a concern that damage may occur due to the vibration generated when the compressor is started or operated, and the shaft moves in the lateral direction and collides with surrounding components. Accordingly, there is a need for a method of preventing the shaft from moving in the transverse direction due to vibration in the sub-ball bearing type compressor.

The present invention is to solve the above-described problems, and an object of the present invention is to provide an electric compressor capable of preventing a shaft from moving in a transverse direction in a sub ball bearing structure.

Another object of the present invention is to provide an electric compressor capable of preventing a shaft from moving in a transverse direction without pressing the shaft into a ball bearing.

According to an embodiment of the present invention, the present invention provides a main housing having an inner space; A motor provided in the main housing and having a stator and a rotor; A shaft coupled to the rotor; A seating portion located on one side of the shaft and having a diameter smaller than that of the shaft; A sub ball bearing slidingly assembled to the seating portion; A hollow portion and a hole provided in the seating portion; It provides an electric compressor including a locking part protruding through the hole and a support part connected to the locking part and accommodated in the hollow part, and a fixing latch having its own elastic force.

According to an exemplary embodiment, it is preferable that the length and width of the locking portion correspond to the length and width of the hole, and at least a portion of the locking portion protrudes from the hole.

According to an exemplary embodiment, it is preferable that the upper portion of the locking portion is inclined downward from the front to the rear. The height of the front of the locking part is greater than the height of the hole, and the height of the rear of the locking part may correspond to the height of the hole.

According to an exemplary embodiment, the support portion may include a portion extending forward from the locking portion. A plurality of the locking portions are provided, a plurality of supporting portions extending forward from the locking portions are provided, and each of the supporting portions may be connected to each other in front of the locking portion.

According to an exemplary embodiment, the other side of the shaft may be rotatably supported by a journal bearing.

According to another embodiment of the present invention, the present invention provides a main housing having an inner space; A motor provided in the main housing and having a stator and a rotor; A shaft coupled to the rotor; A seating portion located on one side of the shaft and having a diameter smaller than that of the shaft; A sub ball bearing slidingly assembled to the seating portion; A hollow portion provided in the seating portion; It includes a locking part and a supporting part connected to the locking part, one side of the locking part is in contact with the sub-ball bearing, one side of the supporting part is connected to the locking part, and the other side includes a fixing clasp inserted and coupled to the hollow part. Provides an electric compressor.

According to an exemplary embodiment, it is preferable that the locking portion is inclined downward from the front to the rear.

According to another embodiment of the present invention, the present invention provides a main housing having an inner space; A motor provided in the main housing and having a stator and a rotor; A shaft coupled to the rotor; A seating portion located on one side of the shaft and having a diameter smaller than that of the shaft; A sub ball bearing slidingly assembled to the seating portion; It includes a locking part and a supporting part connected to the locking part, one side of the locking part is in contact with the sub ball bearing, one side of the supporting part is connected to the locking part, and the other side includes a fixing clasp that is coupled to the outer surface of the seating part. Provides an electric compressor.

According to an exemplary embodiment, it is preferable that the locking portion is inclined downward from the front to the rear.

Meanwhile, features of the above-described embodiments may be implemented in combination in other embodiments, unless contradictory or exclusive with other embodiments.

The electric compressor according to the present invention has the following effects.

First, according to the present invention, the lateral movement of the shaft of the motor is effectively restrained even in the sub-ball bearing method. Therefore, even if vibration occurs in the compressor, the shaft does not move in the transverse direction, thereby improving the reliability of the compressor.

Second, according to the present invention, there is an advantage that the lateral movement of the motor shaft can be restricted without pressing the shaft into the ball bearing.

1 is a cross-sectional view showing the overall structure of an embodiment of an electric compressor according to the present invention.
2 is a cross-sectional view showing an embodiment of an electric compressor according to the present invention.
3 is an exploded perspective view of FIG. 2.
4 is a cross-sectional view showing an assembly process of FIG. 2.
5 is a cross-sectional view showing another embodiment of the electric compressor according to the present invention.
6 is a cross-sectional view showing another embodiment of the electric compressor according to the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the electric compressor according to the present invention will be described. Hereinafter, the components of the present invention will be described with reference to the drawings and embodiments that specifically specify the components of the present invention, but these are only used to aid understanding of the present invention. In addition, in the following embodiments, specific elements may be exaggerated or reduced for convenience of description and may be shown or described, but this is also intended to aid understanding of the present invention. Therefore, the present invention is not limited to the embodiments to be described below or the form drawn in the drawings, and various modifications and variations are possible from these descriptions to those of ordinary skill in the art to which the present invention pertains, and such modifications and variations Is the scope of the present invention.

First, with reference to Fig. 1, the overall configuration of a preferred embodiment of the electric compressor according to the present invention will be described. For reference, the solid arrow L in FIG. 1 represents the flow of the refrigerant.

The compressor 1 may include a main housing 2 having a sealed internal space and an inverter housing 3 coupled to one side of the main housing 2. Various components for compressing fluid, for example, a motor part and a scroll part, may be installed in the main housing 2. An inverter (not shown) may be installed in the inverter housing 3.

Each component is described as follows.

The main housing 2 may be formed in a horizontal cylinder shape. The main housing 2 may be provided with a suction port 222 and a discharge port 242 for entering and exiting the refrigerant. A motor 4 generating a rotational force may be installed in the main housing 2. The motor 4 may include a stator 42 and a rotor 44 that rotates. A shaft 46 may be coupled to the rotor 44.

The main housing 2 may be provided with a fixed scroll 52 and an orbiting scroll 54 for compressing the refrigerant. The fixed scroll 52 may be fixed inside the main housing 2, and the orbiting scroll 54 may be eccentrically coupled to the shaft 46 of the rotor 44. The motor 4 may provide a rotational force for the orbiting scroll 54 to rotate through the shaft 46. In addition, the shaft 46 may be provided with a balance weight 462 for canceling the centrifugal force generated by the rotation of the orbiting scroll (54). The balance weight 462 may be installed on a side opposite to the eccentric direction of the shaft 46.

Meanwhile, an oil sump 7 storing oil may be provided on one side of the main housing 2. An oil separator for separating oil and refrigerant may be provided above the oil sump 7.

Next, a description of the support structure of the shaft 46 is as follows.

Hereinafter, for convenience, the portion in which the scroll parts 52 and 54 are located is referred to as the front of the shaft 46 and the opposite side thereof, that is, the rear portion of the motor 4, as the rear of the shaft 46.

It is preferable that the shaft 46 is rotatably supported. For example, the front of the shaft 46 may be supported by the main frame 26. In addition, to support the shaft 46 to be rotatable, a main journal bearing 66 may be provided between the shaft 46 and the main frame 26. In addition, a journal bearing 64 may be provided between the shaft 46 and the orbiting scroll 54.

A bearing housing 200 is provided at the rear of the shaft 46, and the rear of the shaft 46 may be supported by the bearing housing 200. In addition, to support the shaft 46 rotatably, a sub ball bearing 100 may be provided between the shaft 46 and the bearing housing 200. Therefore, when the shaft 46 rotates, the frictional resistance is reduced by the journal bearings 64 and 66 and the sub ball bearing 100.

The assembly structure of the sub ball bearing 100 and the shaft 46 will be described in detail.

At one end (rear) of the shaft 46, a portion (hereinafter, referred to as'receiving portion') 46a is provided on which the sub ball bearing is seated. It is preferable that the diameter of the seating portion 46a is smaller than the diameter of the shaft 46. Therefore, the stepped portion 46b is provided due to the difference between the diameter of the shaft 46 and the diameter of the seating portion 46a. The outer ring of the sub ball bearing 100 is assembled inside the ball bearing housing 200, and the inner ring of the sub ball bearing 100 is slidably assembled to the seating portion 46a.

On the other hand, in the above-described sub-ball bearing structure, the movement of the shaft 46 to the right in the transverse direction is restricted, but the movement to the left in the transverse direction is not constrained. Because, when the shaft 46 moves to the right in the transverse direction, the stepped portion 46b of the shaft 46 is caught by the front side of the sub ball bearing 100 and is restrained. On the other hand, the movement of the shaft 46 to the left is because there is no restraint structure.

2 and 3, an embodiment of preventing the shaft 46 of the motor from moving to the left in the transverse direction will be described.

A fixing clasp 300 is provided at one end of the shaft 46, and the movement of the shaft 46 to the left in the transverse direction is restricted by the fixing clasp 300.

When describing the fixing clasp 300 is as follows.

The fixing clasp 300 may have a structure that can be folded and unfolded by its own elastic force. For example, the fixing clasp 300 may include a locking portion 330 and a support portion 350 connecting the locking portion 330. It is preferable that the support part 350 elastically support the locking part 330.

A hollow portion 462 into which the fixing clasp 300 is inserted and accommodated may be provided in the seating portion 46a of the shaft 46. In addition, a hole 464 communicating with the hollow portion 462 may be provided in the seating portion 46a of the shaft. The locking portion 330 of the fixing clasp 300 is exposed to the outside of the seating portion 46a through the hole 464 of the seating portion 46a.

Each component will be described in detail.

First, the locking portion 330 of the fixing clasp 300 will be described.

The shape of the locking part 330 is not limited. The locking portion 330 is sufficient as long as it has a shape in which at least a portion is exposed to the outside through the hole 464 of the seating portion 46a.

For example, the length (Lh) and width (Wh) of the locking portion 330 may correspond to the length (L) and width (W) of the hole 464 of the seating portion (46a). The height of the locking portion 330 may be at least partially exposed to the outer surface of the mounting portion 46a through the hole 464 of the locking portion 330.

On the other hand, the upper portion 334 of the locking portion 330 is preferably inclined downward from the front to the rear. The inclined surface 334 may be configured as a straight line or a curved line. (The inclined surface is for convenience of assembly, and details will be described later.) For example, the height H1 of the front 332 of the locking part 330 Is greater than the height H of the hole 464, and the height H2 of the rear 336 may correspond to the height H of the hole 464.

Next, the support portion 350 of the fixing clasp 300 will be described.

It is preferable that the support part 350 elastically supports the locking part 330. That is, when the support portion 350 is inserted into the hollow portion 462 of the seating portion 46a, it is folded, and after being inserted, it is preferably a structure that is unfolded by an elastic force. The support part 350 may have an elastic structure (a kind of leaf spring structure) according to its shape, and it is possible to use an elastic material as a material.

The shape of the support part 350 is not limited, and any shape that performs the above-described function may be applied. For example, the support portion 350 may include a portion 352 extending forward from the locking portion 330. In addition, when there are a plurality of locking portions 330, it may include a connecting portion 354 to which each of the supporting portions 350 is connected. (Two locking portions are shown in FIG. 2) When configured in such a shape, the supporting portion 350 may be a kind of leaf spring and have an elastic force.

On the other hand, the material of the fixing clasp 300 is not limited, and iron-based, non-ferrous, and polymeric materials may be applied as necessary.

Next, the hollow portion 462 and the hole 464 of the shaft seating portion 46a will be described.

The shape of the hollow part 462 of the seating part 46a is not limited, and it is possible as long as it has a shape that can accommodate the fixing clasp 300, in particular, the support part 350. In addition, the shape of the hole 464 of the seating portion 46a is not limited, but the shape of the locking portion 330, in particular, the length (L) and width corresponding to the length (Lh) and width (Wh) of the locking portion 330 It is preferable to have (W). The position of the hole 464 is not limited, but it is preferable that the front of the hole 464 substantially coincides with the rear of the sub ball bearing 100.

4, the assembly structure of the shaft 46, the sub-ball bearing 100, and the fixing clasp 300 will be described.

First, as shown in Figure 4 (a), the fixing clasp 300 is pushed into the hollow portion 462 of the seating portion (46a). Since the support portion 350 of the fixing clasp has elasticity, when the support portion 350 is narrowed, the fixing clasp 300 is inserted into the hollow portion 462.

As shown in (b) of Figure 4, in a state in which the fixing clasp 300 is inserted into the hollow portion 462 of the mounting portion 46a, the locking portion 330 of the fixing clasp is inserted into the hole of the mounting portion 46a. It is located at (464). Then, the locking portion 330 protrudes to the outside through the hole 464 by the elastic force of the support portion 350. In this state, the fixing clasp 300 is assembled to the seating portion 46a. The shaft 46 in this state is pushed into the sub ball bearing 100 by sliding.

At this time, as shown in (c) of Figure 4, the locking portion 330 is inclined downward from the front to the rear. Accordingly, while the locking portion 330 of the fixing clasp is naturally pressed, the seating portion 46a of the shaft 46 passes through the inner ring of the sub ball bearing 100.

As shown in (d) of FIG. 4, when the seating portion 46a of the shaft passes through the inner ring of the sub-ball bearing 100, the locking portion 330 is opened, and the locking portion 330 of the fixing clasp is a sub-ball bearing It protrudes in the direction of (100). That is, the locking portion 330 of the fixing clasp comes into contact with the rear portion of the sub ball bearing 100.

When the assembly is completed in this way, the movement of the shaft 46 to the right in the transverse direction is constrained by the stepped portion 46b of the shaft 46, and the movement to the left in the transverse direction is caused by the locking portion 330 of the fixing clasp. Restrained. Accordingly, according to the present embodiment, even if vibration occurs in the compressor, the lateral movement of the shaft 46 can be effectively restrained both right and left.

Meanwhile, in the above-described embodiment, two holes 464 of the seating portion 46a and two locking portions 330 corresponding thereto are illustrated and described. However, the present embodiment is not limited thereto, and the number of the hole 464 of the seating portion 46a and the corresponding locking portion 330 may be one or two or more. When there are a plurality of locking portions 330, it is preferable to arrange them in a vertical or horizontal symmetric manner. Even when there is one locking part 330, the support part 350 may have substantially the same shape. For example, the support portion 350 may have a shape extending a predetermined length from the front of the locking portion 33 and extending a predetermined length to the rear. In addition, the support portion 350 may have a shape extending only in front of the locking portion 33, and in this case, it is preferable to extend while having a predetermined inclination.

Referring to Fig. 5, another embodiment of a compressor according to the present invention will be described.

This embodiment also has substantially the same basic principle as the above-described embodiment. However, in this embodiment, the structure in which the fixing clasp is assembled to the seating portion is different.

In order to avoid complication of explanation, description will be made focusing on parts different from the above-described embodiment.

A hollow portion 462 is provided in the seating portion 46a. In addition, an assembly hole 468 may be provided inside the hollow part 462. However, in this embodiment, a hole through which the locking portion protrudes from the seating portion 46a may not be provided.

The fixing clasp 300a may include a locking portion 330a and a support portion 350a. An assembly hole 358 may be provided in the support part 350a. The shape of the locking portion 330a is not limited, but one side is preferably in contact with the rear of the sub ball bearing 100. The shape of the support portion 350a is not limited, but one side is connected to the locking portion 330a and the other side is preferably extended in the direction of the hollow portion 462 of the seating portion.

A process in which the fixing clasp 300a is assembled to the seating portion 46a will be described.

The support portion 350a of the fixing clasp 300a is inserted into the hollow portion 462 of the seating portion 46a. In this embodiment, only the support portion 350a of the fixing clasp 300a is inserted into the hollow portion 462, and the locking portion 330a is not inserted. In this state, the fixing clasp 330a is coupled to the seating portion 46a. For example, it may be coupled by fastening the screw 500 to the assembly hole 468 of the mounting portion 462 and the assembly hole 358 of the support portion (350a). The process of assembling the shaft 46 to which the fixing clasp 300a is assembled to the sub ball bearing 100 is the same as in the above-described embodiment.

In this embodiment, only the support portion 350a of the fixing clasp 300a is inserted into the hollow portion 462, and the locking portion 330a is not inserted. Therefore, it is possible to reduce the length of the seating portion 46a than in the above-described embodiment.

6, another embodiment of a compressor according to the present invention will be described.

This embodiment also has substantially the same basic principle as the above-described embodiments. However, in this embodiment, the structure in which the fixing clasp is assembled to the seating portion is different.

In order to avoid complication of explanation, description will be made focusing on parts different from the above-described embodiments.

In this embodiment, a hollow portion is not provided in the seating portion 46a. Further, the mounting portion 46a does not have to be provided with a hole through which the locking portion protrudes. However, an assembly hole 469 may be provided in the seating portion 46a.

The fixing clasp 300b may include a locking portion 330b and a support portion 350b. An assembly hole 468 may be provided in the support part 350b. The shape of the locking portion 330b is not limited, but one side is preferably in contact with the rear of the sub ball bearing 100. The shape of the support portion 350b is not limited, but one side is connected to the locking portion 330b and the other side is preferably extended toward the outer surface of the seating portion 46a. In this embodiment, the end of the locking portion 330b and the support portion 350b may be located on the same plane.

A process in which the fixing clasp 300b is assembled to the seating portion 46a will be described.

In this embodiment, since the hollow portion is not provided in the seating portion 46a, the support portion 350b of the fixing clasp 300b is brought into contact with one end of the seating portion 46a. In this state, the fixing clasp 300b is coupled to the seating portion 46a. For example, it may be coupled by fastening the screw 500 to the assembly hole 468 of the mounting portion (46a) and the assembly hole 469 of the support portion (350b). The process of assembling the shaft 46 to which the fixing clasp 300b is assembled to the sub ball bearing 100 is the same as in the above-described embodiment.

In this embodiment, it is not necessary to process the hollow portion in the seating portion 46a. In addition, in this embodiment, the locking portion 330b and the support portion 350b of the fixing clasp 300b are not inserted into the seating portion 46a. Therefore, it is possible to reduce the length of the seating portion 46a than in the above-described embodiment.

Meanwhile, in the present embodiment, a plurality of locking portions 330b are disposed substantially radially spaced apart from each other at predetermined intervals, and the support portion 350b is illustrated and described with a substantially circular fixing clasp 300b. However, the present embodiment is not limited thereto, and it is possible to have one or two or more locking portions 330b.

On the other hand, in each embodiment, the contents of the other embodiments may be applied substantially the same to portions not separately described. In addition, even if there is no special mention, technical matters described in one embodiment may be equally applied in other embodiments unless matters are arranged with each other.

As described above, in the compressor according to the present invention, it is possible to effectively prevent the shaft from moving in the transverse direction even if vibration occurs in the compressor. Therefore, even if vibration occurs in the compressor, it is possible to prevent damage caused by colliding with other parts due to the lateral movement of the shaft. Therefore, the reliability of the compressor is improved.

In addition, in the present invention, since the transverse movement of the shaft can be prevented without pressing the shaft into the sub ball bearing, the machining tolerance of the shaft inserted into the sub ball bearing can be relaxed. Thus, it is possible to simplify the assembly process of the compressor.

As described above, the present invention has been described with reference to limited embodiments and drawings having specific items such as specific elements, etc., but these are used to aid understanding of the present invention. That is, the present invention is not limited to the embodiments described above, and various modifications and variations are possible from these descriptions to those of ordinary skill in the art to which the present invention pertains, and these modifications and variations are the scope of the present invention.

For example, in the above-described embodiment, a ball bearing has been described as a main bearing and a sub bearing, but the present invention is not limited thereto, and other types of bearings may be used.

1: electric compressor 2: main housing
46: shaft 46a: seating portion
300, 300a, 300b: fixing clasp

Claims (11)

A main housing having an internal space;
A motor provided in the main housing and having a stator and a rotor;
A shaft coupled to the rotor;
A seating portion located on one side of the shaft and having a diameter smaller than that of the shaft;
A sub ball bearing slidingly assembled to the seating portion;
A hollow portion and a hole provided in the seating portion;
A locking portion protruding through the hole and a support portion connected to the locking portion and accommodated in the hollow portion, and a fixing clasp having its own elastic force,
The length and width of the locking portion correspond to the length and width of the hole, at least a portion of the locking portion protrudes from the hole, the upper portion of the locking portion is inclined downward from front to rear, and the height of the front of the locking portion is the hole Is greater than the height of, and the height of the rear of the locking part corresponds to the height of the hole,
A plurality of locking portions are provided, a plurality of supporting portions extending forward from the locking portions are provided, and the supporting portions are connected to each other in front of the locking portion. delete delete delete delete delete The electric compressor of claim 1, wherein the other side of the shaft is rotatably supported by a journal bearing.


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